JPS586700B2 - Fluid plaster composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flowable plaster composition,
More specifically, by simply pouring it into the desired location or spreading it with a simple tool, it forms a horizontal surface through natural flow and hardens within an appropriate amount of time, making it an excellent surface for uneven surfaces such as buildings. The present invention relates to a fluid plaster composition that can ensure precision.

Conventionally, anhydrous gypsum and hemihydrate are mixed with dispersants, dispersion aids, setting modifiers, viscosity modifiers, expansion inhibitors, antifoaming agents, antifreeze agents, water retention agents, aggregates, etc. to improve fluidity. It is known to be used as flooring material.

However, since such flooring materials use gypsum as a base material, they have poor water resistance and are not suitable for outdoor use or places where even a small amount of water is used.

Therefore, as a result of intensive research to improve these disadvantages, the inventors of the present invention have added water and The present invention was based on the discovery that a slurry made by adding water-based epoxy resin can flow naturally by simply pouring it or spreading it with a simple tool, forming a horizontal surface, and exhibiting satisfactory water resistance after curing. completed.

That is, the fluid plaster composition of the present invention comprises (A) a highly fluid gypsum composition, (B) an aqueous epoxy resin, and (C)
It consists of water, and is characterized in that alcohol-based and ketone-based solvents are added to the curing agent for the aqueous epoxy resin.

The ratio of the above three components (5), (B) and (C) in parts by weight is (A):(B):(C)=1oo:5 or more:2
It is 0-50.

The term "aqueous epoxy resin" as used in the present invention means a reaction product of a compound having two or more epoxy groups and a compound having two or more active hydrogens, which can be dissolved or dispersed in water.

The fluid slurry composition according to the present invention has a low slurry viscosity (3000 cps or less) and excellent initial fluidity, and has various other advantages, such as no solid-liquid separation by solidification time, volumetric contraction and volumetric expansion. There is no cracking or bending during curing, and the gelation start time is 5 to 1
Because it takes 80 minutes, it can be walked on within 24 hours after pouring.It has good fluidity, so it has good workability and construction.The compressive strength after 24 hours of immersion in water is 200 kg/cm2 or more, which means it has excellent water resistance. Therefore, it has the advantage of being able to be used outdoors, etc., and being fire resistant as it is non-flammable.

The highly fluid gypsum composition that is component (A) of the fluid plaster composition of the present invention is a mixture consisting of α-1 type hemihydrate gypsum, a dispersant, a dispersion aid, a setting modifier, and a viscosity modifier. .

Aggregates, antifoaming agents, etc. may be added to this mixture as necessary.

Each component of the fluid plaster composition of the present invention will be explained below.

α-1 type hemihydrate gypsum with a standard water content of 27 to 50% by weight is usually selected, but 42% by weight or less is particularly desirable.

The particle size of α-type hemihydrate gypsum is closely related to the standard amount of mixed water of α-type hemihydrate gypsum, and is not particularly limited, but the particle size distribution is less than 10μ, 0-40%, 10-20μ. 1
0-70%, 20-30μ 50% or less, 50μ or more 0
~40% is desirable.

Dispersants are effective for loosening the particles of α-type gypsum hemihydrate into primary particles and increasing the initial fluidity. Condensates of nitsulfonic acid, cresolsulfonic acid, melamine formaldehyde condensate sulfonates, phosphate ester surfactants, polyacrylic dispersants, and the like are used.

Suitable dispersing aids are alkali metal sulfates, such as potassium sulfate.

As coagulation modifiers, various phosphates, various carboxylates,
There are various slowing agents such as proteins, and for example, sodium tripolyphosphate is used, and the gelation start time can be arbitrarily adjusted by adjusting the amount added.

Cellulose, vinyl, and acrylic polymers are used as the viscosity modifier, with methylcellulose and guar gum being particularly preferred.

Antifoaming agents include silicone-based ones (for example, Shin-Etsu Silicone, KF96; Toray Silicone, SH190; Toshiba Silicone, TSA720, TSA730, etc.), surfactant-based ones (such as
Asahi Denka, ADEKA B748; BYK Mallinckott, BY
K-SL, etc.) and mixtures of silicone and surfactant types.

These antifoaming agents may be added to (B) the aqueous epoxy resin.

The aggregate is selected from sand, cement, inorganic waste, etc.

Examples of products in which various additives are blended with α-1 type gypsum include Quickflow (Ube Industries) and Uniflow A.
(Sumitomo Chemical), Plaster SL (Yoshino Gypsum), etc.

The (B) water-based epoxy resin used in the present invention includes ■
Those made by the reaction of phenolic -OH, carboxylic acid -COOH1 amine monoNH2, etc. with shrimp chlorohydrin; ■Olefin compounds oxidized with perbenzoic acid, peracetic acid, or hydrogen peroxide at low temperatures; ■Those produced by oxidizing aromatic alkenyls, drying oils, and drying oil fatty acids with oxygen in the presence of a catalyst;■Those produced by reacting aldehydes and ketones with ylides.

Types of ■ include phenolic 10H and bisphenol A.
1. There are some that use novolak resin, polyphenol, resorcinol, hydroquinone, etc., and generally bisphenol A is often used.

Types (2) include those using butadiene, cyclohexene carbinol, etc. as starting materials.

Glycidyl group derivatives such as glycidyl ether, cricidyl ester, glycidyl amine, and glycidyl imine, polyolefin epoxide, cycloalkene epoxide, and epoxide acetal, which are made using the above raw materials, contain three-membered oxiranes in one molecule. A cured product having two or more rings and made three-dimensional with an appropriate reagent (curing agent) can be used as an aqueous epoxy resin.

Examples of commercially available epoxy resins that can be used in the present invention include Epicoat 828, 815, 819, and 834.
, 1001, 1005, 1007 (made by Shell Chemical); Epicron 850, 855, 1050 (made by Inu Nippon Ink)
; AER331 and AER-661 (manufactured by Asahi Kasei); Epotote YD115, YD121, YD122, YD1
27 (manufactured by Toto Kasei).

Commercially available curing agents that can be used in the present invention include Epolsion EB-1, EB-3, EB-5 (manufactured by Kanebo NSC); Epokey H-350, H-351, H-
258 (manufactured by Mitsui Toatsu); REAC}CA102EM (manufactured by Sanyo Chemical), etc.

The blending ratio of the aqueous epoxy resin (B) of the present invention is 5 parts by weight or more based on 100 parts by weight of the highly fluid gypsum composition (A).

That is, by incorporating 5 parts by weight or more of this aqueous epoxy resin, the water resistance of the final fluid plaster composition can be improved.

The amount added is not particularly limited, but can be appropriately selected so as to impart desired performance to the final fluid plastic composition.

The above-mentioned compounds having two or more epoxy groups, which are raw materials for water-based epoxy resins, may be used as they are, or 0.5% of a nonionic emulsifier with an HLB value of approximately 13 to 18 may be used.
Those added above and emulsified (e.g. Epolsion EA-
1, Kanebo NSC; epoxy EM2860, Sanyo Chemical, etc.) can be used.

Here, a polyoxyethylene phenol-substituted ether nonionic emulsifier having an HLB value of 4 to 20 is mixed and used as the nonionic emulsifier.

As curing agents for obtaining the aqueous epoxy resin of the present invention, amines (aliphatic polyamines, aromatic polyamines, secondary
and tertiary amines), acid anhydrides, polyamide resins, polysulfide resins, boron trifluoride-amine complexes, synthetic resin initial condensates, and others.

Among these, the most effective are amines and polyamide resins, which contain hydrophobic groups such as dimer acid and hydrophilic groups such as amines in the molecule to achieve an appropriate HLB value, and emulsify the epoxy resin. Those that can be dissolved in the aqueous system of the epoxy resin emulsion using the water solubility of amines (preferably partially water-soluble ones with an amine value of about 250 to 350); Hardening agents that are not soluble in water (for example, Sanmide) 305, 315, Sanwa Kagaku) is emulsified with a surfactant and used.

A solvent is added to these curing agents in order to lower the viscosity of the reaction system and improve miscibility with the epoxy resin emulsion.

Such solvents are alcohol-based or ketone-based;
Examples include ethanol, butanol IRA, butyl cellosolve, MEK, and MIBK.

The important third component (C
) The proportion of water is 20 to 50 parts by weight based on 100 parts by weight of the highly fluid gypsum composition (A).

If the amount of water is less than 20 parts by weight, the final fluid plaster composition will not have fluidity, and if it is more than 50 parts by weight, the components will separate, making it impossible to perform a satisfactory coating.

As described above, according to the present invention, α-type hemihydrate gypsum is made by adding various additives to give it good fluidity, and adding alcohol-based and ketone-based solvents as a hardening agent. By sequentially blending aqueous epoxy resin and appropriate water, a plaster composition with excellent fluidity, water resistance, and adhesiveness can be obtained.

The present invention will be explained in more detail with reference to the following examples, but the present invention is not limited to these examples.

Example 1 A highly fluid gypsum composition having the following composition was prepared, and a water-based epoxy resin (Emulcoat 33; NV45%, manufactured by Nippon Kasei) to which 0.6 parts of ethanol was added and water were mixed as shown in Table 1. The compressive strength was measured after immersion in clear water for 24 hours.

The particle size distribution of the α-type hemihydrate gypsum used in the fluid gypsum composition is O~60μ 90 parts, θ~10μ 20 parts, 10~
30μ 50 parts.

As can be seen from the test results in the table above, the water resistance of the resulting plaster material is improved by adding a water-based epoxy resin.

Example 2 An epoxy emulsion having the following composition was blended with the highly fluid gypsum composition having the composition used in Example 1, and a viscosity-reducing solvent was added as shown in Table 2. Fluidity was measured.

Epicote 819 (Shell Chemical) 60 parts Nonionic emulsifier* (HLB=13-18) 5 parts Water
35 parts *Mixture of Na-oleate/polyoxyethylene stearate/triethanolamine oleate/diethylene glycol monolaurate.

From the results in Table 2, it can be seen that alcohol-based and ketone-based solvents do not impair fluidity.

In addition, the compressive strength of these samples is approximately 25 when dry.
It was almost the same at 0 kg/cm2 and 220 kg/cm2 when wet.

Example 3 Antifoaming agent (“4 Master v”; Sannopco ff)
0.3 A colored floor material having the above composition was prepared, and an acrylic urethane clear (Floor Top #7OOO, manufactured by Atom Chemical Co., Ltd.) was applied as a top coat to finish the floor.

At this time, the fluidity of the colored flooring material was 58 mm/109, the compressive strength was 270 kg/cm2, and the abrasion resistance was Taber set S-
33 test machine (100 rotations) 85m9, adhesive strength is 20
kg/cm2 or more (base concrete destruction).

Example 4 The fluidity of fluid plaster compositions obtained by adding different amounts of water to the gypsum composition used in Example 1 was investigated.

The results are shown in Table 3. The amount of each component added is shown in parts by weight.

As can be seen from the results in Table 1, sample No. 17 (Wed 36
% addition)~No. It can be seen that No. 19 (46% water added) exhibits excellent fluidity.

Note that sample No. At No. 20 (addition of 51% water), material separation occurs.

Claims (1)

[Claims] 1. Consisting of (A) a highly fluid gypsum composition, (B) an aqueous epoxy resin, and (C) water, an alcohol-based and ketone-based solvent is added to the curing agent of the aqueous epoxy resin. A fluid plaster composition characterized by: 2 The ratio of (A):(B):(C) in parts by weight is 100:
5 or more: The fluid plaster composition according to claim 1, which has a ratio of 20 to 50.