JP3128320B2 - Non-combustible sheet and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-combustible sheet used for wall coverings, heat-resistant decorative sheet and the like, and a method for producing the same. It has a gender, moreover, excellent incombustible sheet and manufacturing its productivity
It relates to a manufacturing method .

[0002]

2. Description of the Related Art In recent years, problems such as fire prevention and fire resistance have been taken up in building interior materials as well as plastics and clothing under the social needs related to the prevention of fire accidents, and the regulations have become quite strict. . Sheets of paper and the like are no exception, and there is a great demand in the market for so-called flameproof and nonflammable sheets, such as wall coverings, which do not burn and are resistant to heat.

Heretofore, as non-combustible paper for general use, asbestos fiber paper has been representative of inorganic fibers. This asbestos fiber paper excels in all aspects, such as flame retardancy, heat resistance, high strength, easy productivity, and low cost.
It had a wide range of uses.

[0004] Asbestos is usually ore, such as olivine or pyroxene, crystallized in a fibrous form into serpentine or amphibolite in the crust under high pressure by geothermal and hydrothermal action of groundwater. Among them, many varieties used as papermaking raw materials are serpentine-based chrysotile asbestos, and the chemical formula is 3M.
gO · 2SiO ₂ · 2H ₂ O. Fiber diameter is 20 ~
It is as thin as 40 nm and flexible. Hardness is 2.5 ~
It is low at 4.0, and it is in this respect that it is used for wear materials. Further, when the paper is made, since it contains water of crystallization, it is well compatible with water. When mixed with other additives, chrysotile has good adsorption and collection properties because it is cationic in water. These physical properties of a paper sheet are advantageous as inorganic fibers, such as being strong, non-flammable, soft, smooth and easy to make.

[0005]

However, recently, asbestos has a harmful effect on health, and has gradually become unusable in Japan. It is also almost unusable in Western Europe.

Under these circumstances, the development of new materials and the development of alternative materials similar to asbestos have been actively studied in various places, and high-performance inorganic fibers or whiskers have been developed one after another. For example, pitch-based general-purpose carbon fiber, potassium titanate fiber, alumina-silica fiber, glass fiber, and the like have been somewhat widely used. Other examples include gypsum fiber, basic magnesium sulfate fiber, phosphoric acid fiber, and magnesium pyroborate fiber. However, these fibers have not yet reached the area where they can substitute for asbestos in use, productivity, price and the like.

[0007] As another method of making hard-to-burn paper, there is a means of flameproofing. This is a method found in wallpaper, shoji paper, paper heat exchangers, etc., and can be said to be a processing method that does not ignite.
The base material is a material obtained by impregnating or applying a flame retardant to wood pulp paper such as kraft paper, ammonium-containing aqueous inorganic salt, phosphorus-containing nitrogen compound, phosphorus-containing halogen compound, antimony trioxide-halogen compound, boron compound, Halogen compounds and the like are used. However, this treatment is mainly composed of organic substances, and is not completely non-combustible. In addition, there is an aromatic polyamide fiber as a high performance fiber, but it is not versatile.

[0008] Under such circumstances, there has been a strong demand from a social and industrial standpoint to develop a method of substituting the surface where asbestos fiber paper cannot be used with another fiber. From the viewpoint of general-purpose applications, there is a need for all kinds of applications such as wall covering materials, sealing materials, gaskets, packing, asphalt roofing, cushion floors, non-combustible cores, building material covering paper, laminated paper, and heat insulating materials.

Accordingly, an object of the present invention is to provide a low-cost non-combustible sheet having non-combustibility and a method for producing the same.

[0010]

A non-combustible system according to claim 1
The plate contains plate-like brucite as the main material and has a molecular weight of
For fixing 800,000-1,000,000 polyacrylamide
No. 1 binder and polyamide polyamine epichlor
Aggregation, which is a cationic thermosetting resin composed of hydrin,
A second binder for water resistance, and a molecular weight of 8,000,000 to 1,000
Of anionic polyacrylamide
A slurry obtained by adding 3 binders is formed.

[0011] Here, Brucite
Is also known as talc and is mainly veined or clumped in serpentine areas.
Hydroxide (Mg (OH) ₂ ) ore produced in the form
Things .

[0012] The non-combustible sheet according to claim 2 is a plate-like block.
Contains Lucite as main material, molecular weight 800,000-1,000,000
First binder for fixation made of polyacrylamide
And consisting of polyamide polyamine epichlorohydrin
Agglomeration as a cationic thermosetting resin
And an anionic polymer having a molecular weight of 8 to 10 million.
A third binder for aggregation comprising acrylamide,
Cation composed of dimethylaminoethyl methacrylate
Addition of a fourth binder for aggregation, which is a thermoplastic resin
The slurry obtained is formed.

[0013] The non-combustible sheet according to the third aspect is the first aspect.
Or 2) the slurry must contain sepiolite.
Added as a component.

Here, sepiolite is commonly called a mounte.
A clay mineral called leather, which is generally fibrous
Is a lump of magnesium silicate with

[0015] A method for manufacturing a non-combustible sheet according to claim 4.
Is a defibrator that defibrate plate-shaped brucite as the main material
In addition, a thermoplastic tree is added to the defibrated plate-like brucite.
Add and mix the first binder for fixing made of fat
A first mixing step, and the plate-like block obtained in the first mixing step.
The mixture of Lucite and the first binder is cationic
Aggregation made of thermosetting resin, second binder for water resistance
A second mixing step of adding and mixing, and the second mixing step
The plate-like brucite obtained in the above step, a first binder and
For the second binder, a coagulant comprising an anionic thermoplastic resin is used.
A third binder is added and mixed to form a bundle.
Bundling step, and papermaking the slurry obtained in the bundling step
And a papermaking process.

[0016] A method for manufacturing a non-combustible sheet according to claim 5.
Is a defibrator that defibrate plate-shaped brucite as the main material
In the process, the defibrated plate-like brucite has a molecular weight of 80.
Consists of 10,000 to 1 million anionic polyacrylamide
Add first binder for fixing First mixing to mix
And the plate-like brusar obtained in the first mixing step.
Polyamide polyamide in the mixture of
Cationic thermosetting tree composed of minepichlorohydrin
Adds and mixes a second binder for coagulation and water resistance as fat
A second mixing step, and the second mixing step obtained in the second mixing step.
Plate-like brucite, first binder and second binder
-Anion having a molecular weight of 8,000,000 to 10,000,000
Third binder for aggregation made of conductive polyacrylamide
Adding, mixing, and converging; and
And a papermaking step of papering the slurry obtained in the
You.

[0017] A method for manufacturing a non-combustible sheet according to claim 6
Is a defibrator that defibrate plate-shaped brucite as the main material
In addition, a thermoplastic tree is added to the defibrated plate-like brucite.
Add and mix the first binder for fixing made of fat
A first mixing step, and the plate-like block obtained in the first mixing step.
The mixture of Lucite and the first binder is treated with cationic heat
Add a second binder for aggregation and water resistance made of curable resin
A second mixing step of adding and mixing, and the second mixing step
Of the plate-like brucite, the first binder and the second
Composed of anionic thermoplastic resin in the mixture of inders
Add a third binder for aggregation, mix and focus
A first convergence step, and a plate shape obtained in the first convergence step.
Brucite, first binder, second binder and
From a cationic thermoplastic resin to a mixture of 3 binders
Add a fourth binder for agglomeration, mix and bind
Focusing step for accelerating, and the second focusing step
And a papermaking step of papering the slurry obtained in the above.

[0018] A method for manufacturing a non-combustible sheet according to claim 7
Is a defibrator that defibrate plate-shaped brucite as the main material
In the process, the defibrated plate-like brucite has a molecular weight of 80.
Consists of 10,000 to 1 million anionic polyacrylamide
First mixing in which a first binder for fixing is added and mixed
And the plate-like brucite obtained in the first mixing step
And polyamide binder in the mixture of
A cationic thermosetting resin consisting of picrohydrin
Agglomeration, adding a second binder for water resistance and mixing
2 and the plate-shaped bull obtained in the second mixing step.
-Site, first bar Mixture of inder and second binder
In addition, anionic polyac having a molecular weight of 8,000,000 to 10,000,000
Add a third binder for aggregation consisting of Lilamide
Mixing and converging a first converging step;
Plate-like brucite obtained in the bundling step, a first binder,
Dimethyl is added to the mixture of the second binder and the third binder.
Cationic thermoplastic composed of aminoethyl methacrylate
Addition of a fourth binder for aggregation, which is a conductive resin, and mixing
And a second focusing step of promoting focusing, and the second focusing step
And a papermaking step of papering the slurry obtained in the sizing step.
I do.

[0019]

In the non-combustible sheet according to the first aspect, the first
Polyac having a molecular weight of 800,000 to 1,000,000 as a binder
Lilamide sticks defibrated plate-like brucite
Bonds and enhances paper strength, especially when dry. Also, the second buy
Polyamine Epichlorhydrides as Binders
The cationic thermosetting resin consisting of
Agglomerates and three-dimensionally cross-links to provide water resistance,
Strengthens paper strength not only when dry but also when wet. Furthermore, the third
Ani with a molecular weight of 8,000,000 to 10,000,000 as a binder
On polyacrylamide to plate-like brucite
When promoting the fixing of the first binder and the second binder,
Both aggregate flocculent plate-like brucite, and drainage during papermaking
To improve.

On the other hand, the plate-like brucite has its hydroxyl group
Excellent solidification and adsorption properties, and familiar with water
It has excellent properties and disperses easily in water. For this reason,
Slurry mainly composed of plate-like brucite is produced by papermaking.
Thus, it can be easily formed into a sheet. Furthermore, on
The plate-like brucite is fixed by the first to third binders.
In order to form a bonded and agglomerated slurry,
Non-combustible sheet with improved drainage and improved papermaking properties
Can be more easily performed. In addition,
The non-combustible sheet is dried with the first to third binders.
Has sufficient paper strength and shape retention when dry and wet
You.

The main component of the slurry is an inorganic material.
To use plate-like brucite , Non-combustible paper after papermaking
The sheet has sufficient non-combustibility. In addition, brucite
Is a natural mineral that can be obtained at low cost as a raw material.
Therefore, non-combustible sheets mainly composed of brucite
The cost can be greatly reduced and the manufacturing cost can be reduced.

In the non-combustible sheet according to the second aspect,
Polyamide having a molecular weight of 800,000 to 1,000,000 as the first binder
Acrylamide adheres defibrated plate-like brucite
To enhance paper strength, especially when dry. Also, the second
Polyamide polyamine epichlorch as a binder
The cationic thermosetting resin consisting of drin is
-Agglomeration of sites and three-dimensional crosslinking to impart water resistance
And enhances the paper strength not only when dry but also when wet. Furthermore,
The molecular weight of 8,000,000 to 10,000,000 as the third binder
Anionic polyacrylamide is a plate-like brucite
Promotes fixing of the first binder and the second binder to the surface
Together with the plate-like brucite to form a filter during papermaking.
Improve aqueousness. In addition, the dye as the fourth binder
Cationic heat composed of tylaminoethyl methacrylate
Plastic resin promotes aggregation of plate-like brucite,
Further improves drainage during papermaking.

On the other hand, the plate-like brucite has its hydroxyl group
Excellent solidification and adsorption properties, and familiar with water
It has excellent properties and disperses easily in water. For this reason,
Slurry mainly composed of plate-like brucite is produced by papermaking.
Thus, it can be easily formed into a sheet. Furthermore, on
The plate-like brucite is fixed by the first to fourth binders.
In order to form a bonded and agglomerated slurry,
Non-combustible sheet with improved drainage and improved papermaking properties
Can be more easily performed. In addition,
The noncombustible sheet is dried with the first to fourth binders.
Has sufficient paper strength and shape retention when dry and wet
You.

The main component of the slurry is an inorganic material.
Because of the use of plate-like brucite, non-combustible
The sheet has sufficient non-combustibility. In addition, brucite
Is a natural mineral that can be obtained at low cost as a raw material.
Therefore, non-combustible sheets mainly composed of brucite
The cost can be greatly reduced and the manufacturing cost can be reduced.

In the non-combustible sheet according to the third aspect,
Sepiolite added to the slurry has hydroxyl groups on the surface
With such properties, it exhibits properties such as adsorptive properties, thixotropic properties and sticking properties.
In addition, the solidification of the non-combustible sheet is enhanced.

[0026] A method for manufacturing a non-combustible sheet according to claim 4.
In the defibration process, plate-like brucite is defibrated and is good
Disperse in. In the first mixing step, the first binder
Adheres and binds the defibrated plate-like brucite,
Paper strength during drying. Further, in the second mixing step,
When the second binder agglomerates the plate-like brucite,
Three-dimensionally crosslinks to impart water resistance, not only when dry, but also when wet
Enhance paper strength at the time of moisture. In addition, in the focusing process,
The first binder and the first binder for the plate-like brucite
Promotes fixing of the second binder and the
-Aggregates sites to improve drainage during papermaking.

In particular, the order of adding the first and second binders
As a fixing agent made of a thermoplastic resin in the first mixing step
The first binder is added first, and then the second
Coagulation of cationic thermosetting resin for water resistance
2 Add the binder. Therefore, the first and second
Each of the inders performs their functions smoothly,
Paper properties are improved. Further, addition of second and third binders
In order, in the second mixing step, the cationic thermosetting resin
Agglomeration consisting of, first added a second binder for water resistance,
After that, it is made of an anionic thermoplastic resin in the sizing step
A third binder for aggregation is added. That is, two kinds of
Add the binder for collection in the order of cation and anion
You. Therefore, the addition of the second binder in the second mixing step
Slurry with more cation side
By adding an anionic third binder.
The floc of plate-like brucite can be coarsened
it can. Therefore, aggregation of plate-like brucite is further increased.
It is performed effectively, and the drainage during papermaking is further improved.

[0028] A method for manufacturing a non-combustible sheet according to claim 5.
Is a plate-shaped brucite in the defibration process Is defibrated and good
Disperse in. In the first mixing step, the first binder
Anionic polyac having a molecular weight of 800,000 to 1,000,000
Lilamide sticks defibrated plate-like brucite
Bonds and enhances paper strength, especially when dry. In addition, the second blend
In the joining process, polyamide polyamide as the second binder
Cationic thermosetting resin composed of n-epichlorohydrin
However, the plate-like brucite aggregates and crosslinks three-dimensionally.
To provide water resistance and increase paper strength not only when dry but also when wet
To strengthen. In addition, as a third binder in the sizing step
Anionic polyacrylic acid having a molecular weight of 8,000,000 to 10,000,000
Luamide is the first binder to plate-like brucite and
Promotes fixing of the second binder and the
-Aggregates sites to improve drainage during papermaking.

In particular, the order of adding the first and second binders
In the first mixing step, a compound having a molecular weight of 800,000 to 1,000,000
First binder made of nonionic polyacrylamide
Added first and then in a second mixing step
Cationic thermosetting composed of amine epichlorohydrin
A second binder as a resin is added. Therefore,
Each of the first and second binders facilitates their respective functions.
And papermaking properties are improved. In addition, the second and third bikes
The order of addition of the binder is as follows.
Cationic thermosetting composed of polyamine epichlorohydrin
The second binder, which is a curable resin, is added first, and then
Anionic with a molecular weight of 8 million to 10 million in the focusing process
Add a third binder made of polyacrylamide
You. That is, two kinds of aggregation binders are used for
Add in the order of the nions. For this reason, the second mixing step
2 The cation side due to the addition of binder
Rally with an anionic third binder in the focusing process
By adding, floc of plate-like brucite
It can be coarse. Therefore, the plate-shaped Brusa
The agglomeration of the particles is more effectively performed, and the drainage during papermaking is reduced.
Improve layers.

As a result, sufficient paper strength and nonflammability are provided.
To provide easy and inexpensive non-combustible sheets by papermaking
be able to.

[0031] A method for manufacturing a non-combustible sheet according to claim 6.
In the defibration process, plate-like brucite is defibrated and is good
Disperse in. In the first mixing step, the first binder
Adheres and binds the defibrated plate-like brucite,
Paper strength during drying. Further, in the second mixing step,
When the second binder agglomerates the plate-like brucite,
Three-dimensionally crosslinks to impart water resistance, not only when dry, but also when wet
Enhance paper strength at the time of moisture. In addition, in the first focusing step,
The third binder is the first binder to plate-like brucite
Promotes the fixing of the binder and the second binder.
Aggregates brucite to improve drainage during papermaking
You. And in the second sizing step, the fourth binder is
Promotes flocculation of plate-like brucite to improve drainage during papermaking
Is further improved.

In particular, the order of adding the first and second binders
As a fixing agent made of a thermoplastic resin in the first mixing step
The first binder is added first, and then the second
Coagulation of cationic thermosetting resin for water resistance
2 Add the binder. Therefore, the first and second
Each of the inders performs their functions smoothly,
Paper properties are improved. Further, addition of second to fourth binders
In order, in the second mixing step, the cationic thermosetting resin
A second binder for coagulation and water resistance consisting of
In the first sizing step, anionic thermoplastic resin is used.
A third binder for coagulation is added, followed by a second binder.
In the bundling step, the second one for agglomeration consisting of cationic thermosetting resin
4 Add the binder. That is, three types of coagulation vines
Cation, anion, and cation in this order.
You. Therefore, the addition of the second binder in the second mixing step
The first collection is added to the slurry that is more cationic side.
Adding an anionic third binder in the bundling step
Can increase the floc size of plate-like brucite.
Can be. Further, in the second focusing step, the cationic
By adding 4 binders, a hydrophobic floc is formed.
And a strong floc can be formed. But
Therefore, aggregation of plate-like brucite is more effectively performed.
Thus, drainage during papermaking is further improved.

As a result, sufficient paper strength and nonflammability are provided.
Made non-combustible sheet easier by papermaking And provide cheaply
be able to.

[0034] A method for manufacturing a non-combustible sheet according to claim 7.
In the defibration process, plate-like brucite is defibrated and is good
Disperse in. In the first mixing step, the first binder
Anionic polyac having a molecular weight of 800,000 to 1,000,000
Lilamide sticks defibrated plate-like brucite
Bonds and enhances paper strength, especially when dry. In addition, the second blend
In the joining process, polyamide polyamide as the second binder
Cationic thermosetting resin composed of n-epichlorohydrin
However, the plate-like brucite aggregates and cross-links three-dimensionally.
To provide water resistance and increase paper strength not only when dry but also when wet
To strengthen. In addition, as a third binder in the sizing step
Anionic polyacrylic acid having a molecular weight of 8,000,000 to 10,000,000
Luamide is the first binder to plate-like brucite and
Promotes fixing of the second binder and the
-Aggregates sites to improve drainage during papermaking. Soshi
In the second sizing step, the image as the fourth binder is removed.
Cationic heat composed of tylaminoethyl methacrylate
Plastic resin promotes aggregation of plate-like brucite,
Further improves drainage during papermaking.

In particular, the order of addition of the first and second binders
In the first mixing step, a compound having a molecular weight of 800,000 to 1,000,000
First binder made of nonionic polyacrylamide
Added first and then in a second mixing step
Cationic thermosetting composed of amine epichlorohydrin
A second binder as a resin is added. Therefore,
Each of the first and second binders facilitates their respective functions.
And papermaking properties are improved. In addition, the second to fourth
The order of addition of the binder is as follows.
Cationic thermosetting composed of polyamine epichlorohydrin
A second binder, which is a curable resin, is added.
Anion having a molecular weight of 8,000,000 to 10,000,000 in the focusing process
Addition of a third binder made of conductive polyacrylamide
And then in a second focusing step dimethylaminoethyl
It is a cationic thermoplastic resin composed of methacrylate
Add the fourth binder. That is, three types of aggregation
Cation, anion, and cation in this order.
You. Therefore, the addition of the second binder in the second mixing step
The first, more cationic side slurry, Collection
Adding an anionic third binder in the bundling step
Can increase the floc size of plate-like brucite.
Can be. Further, in the second focusing step, the cationic
By adding 4 binders, a hydrophobic floc is formed.
And a strong floc can be formed. But
Therefore, aggregation of plate-like brucite is more effectively performed.
Thus, drainage during papermaking is further improved.

As a result, sufficient paper strength and non-combustibility are provided.
To provide easy and inexpensive non-combustible sheets by papermaking
be able to.

[0037]

Embodiments of the present invention will be described below.

The non-combustible sheet of this embodiment is made of natural fibrous magnesium hydroxide (mineral name BRUCIT) as a main material.
E) was used.

The non-combustible sheet mainly composed of fibrous magnesium hydroxide was manufactured according to the process shown in FIG.

FIG. 1 is an explanatory view showing an outline of a manufacturing process of a non-combustible sheet in one embodiment of the present invention.

First, in the defibration step A, natural fibrous magnesium hydroxide, which is a main raw material, glass fiber as a reinforcing material, wood pulp of reinforcing fiber, and synthetic fiber are put into a defibrating machine and defibrated by stirring. Fine and good dispersion of fibers. In this example, if the amount of wood pulp is set to 5% by weight or more, nonflammability is hindered.
Weight% or less.

Next, in the raw material mixing step B, the fibrillated fibrous magnesium hydroxide, the first binder, the second binder, the softener, the stabilizer and the like are put into a mixing tank and mixed.
Make a slurry. The first binder used here has a molecular weight of 8 which is a thermoplastic resin in order to increase paper strength.
Using 100,000 to 1,000,000 PAA (polyacrylamide), the second binder uses a thermosetting resin having a network-like three-dimensional structure to impart cohesiveness and water resistance,
Among them, EPA (polyamide polyamine epichlorohydrin) was used.

Here, the order of adding the respective binders is as follows: the first binder is added first, and then the second binder is added.
It is desirable to add a binder, but the present invention is not limited to this. Papermaking is possible even if the second binder is mixed first and the first binder is mixed later.

The slurry mixed in the raw material mixing step B is
In the processing step C, bunching is performed by a stock bunching reaction device. In the sizing, in order to promote fixing of the first binder and the second binder to the slurry and to improve drainage during papermaking, a molecular weight of 8,000,000 to 1,000 is used.
Ten thousand anionic PAAs were added.

The slurry prepared and converted into stock in the processing step C is sent to a stock tank and accumulated so as to maintain a uniform mixed state so that sedimentation or collapse of the prepared stock does not occur. Step D is entered.

Then, the slurry uniformly maintained in the accumulation step D is pumped up to a quantitative hopper by a quantitative pump,
The slurry measured by the quantitative hopper is led to a papermaking process E.

In the paper making step E of this embodiment, paper was made using a short-mesh paper machine. The slurry concentration at this time is 0.5 to
The short-mesh type paper machine used a 60-80 mesh netting. In the papermaking process E, when the dispersion aqueous solution having the formed flocculated flocks flows from above into a paper implement having a mesh of about 80 mesh, water quickly flows down from the mesh through the flocculated flocs to form a paper layer. You.

Thereafter, in a drying step F, the paper layer is dehydrated by pressing and dried at an ambient temperature of about 120 ° C. for a predetermined time, whereby the water content in the paper layer evaporates and the binder is condensed. Is promoted and dried and solidified. Then, the dried molded body is peeled from the dryer surface of the steam rotary dryer and formed on a roll of paper.

Thus, a noncombustible sheet having a thickness of 0.1 to 1.0 mm is completed. This non-combustible sheet has high heat resistance, and can maintain a predetermined shape only by slight smoke and blackening even when a fire is approached.

It is to be noted that fibrous magnesium hydroxide is preferably in the form of a powder or a plate because it is difficult to make paper in the case of a powder or a plate.

As described above, the non-combustible sheet of the above embodiment is made of natural fibrous magnesium hydroxide as a main material, glass fiber as an inorganic fiber as a reinforcing material, and PAA (polyurethane) as a thermoplastic resin. The slurry is prepared by forming a slurry containing, as essential components, a first binder composed of acrylamide) and a second binder composed of EPA (polyamide polyamine epichlorohydrin), which is a thermosetting resin.

Therefore, according to the above embodiment, the sheet formed by adding the first binder and the second binder to the fibrous magnesium hydroxide has a main component of a natural fibrous magnesium hydroxide. It is nonflammable and easy to make paper.

Further, the thermoplastic resin as the first binder contributes to the fixation of the fibrous magnesium hydroxide and improves the strength of the sheet. Furthermore, EPA, which is a thermosetting resin of the second binder, is a polymer compound having a network-like three-dimensional structure, and atoms are connected by strong covalent bonds.
It is stable to water, gives water resistance to paper, and improves drainage in papermaking to further facilitate sheet formation.

Further, by mixing glass fiber as a reinforcing material, strength physical properties can be further improved.

Since a widely used material is used as a raw material and a binder, it can be manufactured at low cost.

Next, another embodiment will be described.

In this another embodiment, a cationic thermoplastic resin is added to the first binder, the second binder, and the aggregating PAA which is an anionic thermoplastic resin, and the aggregating PAA ( Molecular weight 8 million to 1000
) As the third binder, and the cationic thermoplastic resin as the fourth binder.

The third binder and the fourth binder act as a flocculant, and the floc is further coarsened with respect to the binder fixed and flocculated by adding the first binder and the second binder described in the above embodiment. As a result, papermaking properties can be improved. That is, in the raw material mixing step B,
After adding the first binder and the second binder in the same manner as in the above-mentioned embodiment, the third binder, which is an anionic thermoplastic resin, is mixed with the slurry forming the cation side to coarsen the floc. By adding a fourth binder as a system coagulant to form a hydrophobic floc, a strong floc can be formed.

Here, as the third binder, in addition to the above-mentioned PAA for aggregation, for example, AA (acrylamide acrylic acid copolymer) is used. As the fourth binder, for example, DMAEM (dimethylaminoethyl) is used. (Methacrylate).

In this embodiment, the addition order of the first binder and the second binder is preferably such that the first binder is added first and the second binder is added later, but the order may be reversed. Also in the order of addition between the binder and the fourth binder, the third binder is preferred first, but the reverse is also possible, and papermaking is possible.

In the above embodiment, the first binder made of thermoplastic resin is PAA, the second binder made of thermosetting resin is EPA, the third binder made of thermoplastic resin is AA, and the thermoplastic resin is AA. Although the fourth binder made of DMAEM is used, the present invention is not limited to this, and other synthetic polymers and natural polymers can be used. The resin used for each of the thermoplastic resin and the thermosetting resin may be one type, or two or more types may be mixed.

Although the fibrous magnesium hydroxide in the above embodiment is of a natural type, it is not limited to this, and may be a synthetic product. However, in this case, the cost is high.

Further, in the non-combustible sheet of the above embodiment, sepiolite may be added to a slurry mainly containing magnesium hydroxide. Sepiolite is a clay mineral commonly referred to as mountain leather and has adsorptive properties, thixotropic properties, and solidifying properties. The above properties can be imparted by adding sepiolite.

The non-combustible sheet of the above embodiment contains glass fiber as a reinforcing material. However, the present invention is not limited to this. For example, rock wool fiber, stainless steel fiber, Various reinforcing materials such as whiskers can be used. However, glass fiber is most suitable in terms of material cost, cohesion effect and the like. It is not always necessary to mix the reinforcing material depending on the intended use. In the embodiment of the invention of this type, the step of mixing the reinforcing material can be omitted, and the operation can be simplified. Further, a smooth feel can be given to the non-combustible sheet which is mixed with glass fiber and has a hard feeling. Similarly, it is not always necessary to mix wood pulp and synthetic fibers as reinforcing fibers,
It may be appropriately used in consideration of papermaking properties, intended use, and the like.

The non-combustible sheet of this embodiment can be used for wall covering materials, sealing materials, architectural covering paper, etc.
In addition, by adhering to both sides of the heat insulating material, it is possible to use the heat insulating material in such a manner that the fibers of the heat insulating material are prevented from fluffing and peeling. Alternatively, it can be used as an insulating material.

The non-combustible sheet can be formed into a sheet having a thickness of about 10 mm, and can be formed into an uneven shape, so that it can be used as a three-dimensionally shaped non-combustible material.

[0067]

The non-combustible sheet according to claims 1 and 2 is
With the above configuration, sufficient paper strength and non-combustibility
Non-combustible sheet with good properties, etc., easily and inexpensively by papermaking
Can be provided.

The non-combustible sheet according to claim 3 is as described above.
With this configuration, the effect of claim 1 or 2 is added.
In addition, the paper strength of the non-combustible sheet can be further improved.

Production of the non-combustible sheet according to claims 4 to 7
The method has a sufficient paper strength by being configured as described above.
Non-combustible sheet with non-combustibility
It can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing a manufacturing process of a non-combustible sheet according to one embodiment of the present invention.

[Explanation of symbols]

 A Fibrillation process B Raw material mixing process C Processing process D Accumulation process E Papermaking process F Drying process

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-55-104994 (JP, A) JP-A-60-65196 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D21H 13/46

Claims (7)

(57) [Claims] 1. A polyacrylamide containing plate-like brucite as a main material and having a molecular weight of 800,000 to 1,000,000.
A tie comprising a first binder for fixing and a polyamide polyamine epichlorohydrin
Second binder for coagulation and water resistance, which is an on-setting thermosetting resin
-And anionic polyacrylic having a molecular weight of 8,000,000 to 10,000,000
A sulphide containing an amide third binder for coagulation;
Non-combustible sheet made by making a rally. 2. A fixing first binder comprising plate-like brucite as a main material and comprising polyacrylamide having a molecular weight of 800,000 to 1,000,000, and a click comprising polyamide polyamine epichlorohydrin.
A second binder for aggregation and water resistance, which is an on-setting thermosetting resin, and an anionic polyacryl having a molecular weight of 8,000,000 to 10,000,000
A third binder for aggregation composed of amide and a cation composed of dimethylaminoethyl methacrylate
Addition of a fourth binder for aggregation, which is a thermoplastic resin
A non-combustible sheet obtained by forming a slurry into a non-combustible sheet. To wherein the slurry, incombustible sheet according to claim 1 or 2, characterized in that adding the sepiolite as an essential component. 4. A fibrous plate brucite as a main material is defibrated.
Defibration process, and the defibrated plate-like brucite, from a thermoplastic resin
The first binder for fixation and mixing
A mixing step, and the plate-like brucite obtained in the first mixing step and the first bar.
Use a mixture of cationic thermosetting resin and
Agglomeration, adding a second binder for water resistance and mixing
2, the plate-like brucite obtained in the second mixing step,
1st binder and 2nd binder, anionic thermoplastic
Add a third binder for cohesion made of conductive resin and mix
And a sizing step of sizing, and a sheeting step of sheeting the slurry obtained in the sizing step.
A method for manufacturing a non-combustible sheet, comprising: 5. A fibrous plate-like brucite as a main material is defibrated.
Defibration step, and a molecular weight of 800,000 to 1
For fixing of 100,000 anionic polyacrylamide
Mixing step in which the first binder is added and mixed
And the plate-like brucite obtained in the first mixing step
1 Polyamide epiamine mixture in a mixture with binder
It is a cationic thermosetting resin composed of chlorhydrin
Second adding and mixing a second binder for coagulation and water resistance
Mixing step, the plate-like brucite obtained in the second mixing step,
The mixture of the first binder and the second binder has a molecular weight of 8
Million to 10 million anionic polyacrylamide
A third binder for coagulation is added, mixed and bundled.
A sizing step, and a sheeting step of sheeting the slurry obtained in the sizing step.
A method for manufacturing a non-combustible sheet, comprising: 6. A plate-shaped brucite as a main material is defibrated.
Defibration process, and the defibrated plate-like brucite, from a thermoplastic resin
The first binder for fixation and mixing
A mixing step, and the plate-like brucite obtained in the first mixing step and the first bar.
A second bar for coagulation and water resistance made of a cationic thermosetting resin
A second mixing step of adding and mixing an indder, the plate-like brucite and the first bar obtained in the second mixing step.
Anionic heat is applied to the mixture of the binder and the second binder.
Adding a third binder for cohesion consisting of a plastic resin
A first convergence step of mixing and converging, and the plate-like brucite obtained in the first convergence step;
Mixture of binder, second binder and third binder
The fourth vial made of a cationic thermoplastic resin for agglomeration
Second focusing to add and mix
And a paper making process for forming the slurry obtained in the second sizing step.
The method for producing a non-combustible sheet, comprising:
Law. 7. A plate-like brucite as a main material is defibrated.
Defibration step, and a molecular weight of 800,000 to 1
For fixing of 100,000 anionic polyacrylamide
Mixing step in which the first binder is added and mixed
And the plate-like brucite obtained in the first mixing step and the first bar.
In a mixture with Inda, polyamide polyamine epichloro
Aggregation, which is a cationic thermosetting resin composed of hydrin,
Second mixing in which a second binder for water resistance is added and mixed
Step, the plate-like brucite obtained in the second mixing step,
The mixture of the binder and the second binder has a molecular weight of 800
10,000 to 10 million anionic polyacrylamide
A third binder for aggregation is added and mixed to form a bundle.
A first focusing step, and the plate-like brucite obtained in the first focusing step,
Mixture of binder, second binder and third binder
In addition, a click made of dimethylaminoethyl methacrylate
Add a fourth binder for coagulation, which is an on-thermoplastic resin
A second sizing step to add and mix and promote sizing
A papermaking step of papering the slurry obtained in the second sizing step;
A method of manufacturing a non-combustible sheet, comprising:
Law.