JPH0624822B2 - Cosmetic material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fire-resistant decorative material used for building interior and exterior materials, furniture decorative materials, and the like.

<Prior Art> Conventionally, fire-resistant decorative materials have been limited to those of inorganic type and metal type, which have problems in workability, impact resistance, etc., and mainly have a thickness of 3 mm or more.

On the other hand, although some resin-based decorative materials are thin, they have drawbacks such as significant heat generation and smoke generation during combustion, breakage, or large dimensional change and warp deformation.

<Objects of the Invention> The present invention has been made as a result of studies in view of the above circumstances, and provides a decorative material having excellent fire resistance and workability, and having little dimensional change, warp deformation, and the like. .

<Disclosure of the Invention> The gist of the decorative material according to the present invention is as described above, and a sheet made of inorganic fibers such as glass fibers and alumina fibers, a nonwoven fabric, a sheet such as cloth is provided with melamine resin, aluminum hydroxide and A decorative material formed by stacking a plurality of molding sheets impregnated with a composition comprising the melamine resin modifier and a thermosetting resin impregnated on the front or front and back surfaces of the plurality of molding sheets stacked. The present invention relates to a decorative material formed by stacking paper decorative sheets.

The sheet has a basis weight of 30 to 300 treated with a binder component such as epoxy resin or polyvinyl alcohol resin.
A g / m ² glass non-woven fabric is suitable. When it is 30 g / m ² or less, the strength is insufficient, so that the handling property during impregnation and molding is difficult, and when it is 300 g / m ² or more, the impregnating property is difficult, which is not preferable.

The composition of the blend is composed of a mixture of 5 to 40 wt% of melamine resin and 95 to 60 wt% of aluminum hydroxide, and 1 to 40 wt% of the melamine resin modifier is added to the melamine resin. If the content is 8 wt% or less, it will be possible to comply with the non-combustible material specified by Ministry of Construction No. 1828 "Matters to be designated as non-combustible material".

The composition is used as it is, or diluted with a diluent such as water or alcohol to 200 to 1500 for the sheet.
wt% is impregnated. If it is less than 200 wt%, the adhesion and surface finish will be poor, which is not preferable. If it is 1500 wt% or more, the drying time becomes long and the productivity becomes poor. It is difficult to control the coating, and the molded sheet becomes excessively heavy and easily broken, which is not preferable.

As the melamine resin, an unmodified melamine resin and an alcohol-modified (etherified) melamine resin are used. Among them, alcohol-modified melamine resin is more desirable because it has a more flame-retardant effect.

Examples of the melamine resin modifier include water-soluble or alcohol-soluble, for example, acrylic polymerizable monomers and their oligomers and thermoplastic resin emulsions. Among them, they are polymerized or condensed alone or reacted with the melamine resin. It is preferable that it can be obtained. The modifier is suitable to be added in a weight ratio of 1 to 40% with respect to the melamine resin, and is preferably 20% or less in order to ensure nonflammability.

Aluminum hydroxide having a particle size of 100 μm or less, preferably 30 μm or less is preferable. If the particle size is 100 μm or more, the particle surface is reduced and the flame retarding effect is reduced, the penetration and dispersion into the sheet are restricted, and the uniformity of the molded sheet or the decorative material may not be ensured, which is not preferable. Aluminum hydroxide may be mixed in when the sheet is formed.

The decorative sheet to be laminated on the front surface or the front and back surfaces of the molding sheet is a paper or printing paper having a basis weight of 15 to 200 g / m ² made of pulp, linter, synthetic fiber, glass fiber or the like and melamine similar to the above. Resin or thermosetting acrylic resin, urethane resin, fluorine resin, etc. is 50 to 300
Thermosetting resin impregnated paper impregnated with wt% is used. As the decorative sheet, in addition to the above fibers, an inorganic component such as titanium oxide, aluminum hydroxide, calcium silicate is mixed, and a sheet having a small amount of resin is advantageous for nonflammability.

The thus-prepared molding sheets are individually laminated to form a plurality of sheets, or the cosmetic sheets are laminated on the front surface or the front and back surfaces and heated and pressed to complete the decorative material of the present invention. In molding, a mirror-finished plate, an embossed plate, an embossed film, or the like is overlaid, and a surface such as flat finish or emboss finish is finished. It should be noted that the coating may be applied at any time when the cosmetic sheet is used or not used.

<Effects of the Invention> The decorative material according to the present invention comprises glass, a porous sheet such as a non-woven fabric or cloth made of inorganic fibers such as alumina, melamine resin, aluminum hydroxide and a modifier for the melamine resin. Since the compound is a composite and integrated product, it not only excels in workability such as cutting and fire resistance, but also has excellent dimensional stability and is not warped and deformable. In addition, since the molding flow of the composition is extremely good due to the use of the modifier, uniform moldability and adhesiveness are secured even if the treatment rate for the sheet is low, and surface performance excellent in stain resistance is obtained. .

<Example> 1 mol of melamine was converted to 3 mol of formaldehyde under weak alkali, and condensation was simultaneously etherified with methanol in acidification to obtain an initial condensate of a melamine resin. Aluminum hydroxide (Showa Denko KK, Hydilite average particle size 17μ) was blended in the initial condensate at a solid content ratio of 8:92, and paratoluenesulfonic acid (PTS) was used as a curing agent in the initial condensate. 2% was added. Acrylic resin emulsion (Nippon Acrylic Chemical Co., Ltd., Primal AC-61) was added to the dish as a modifier at a solid content of 10% to prepare a treatment liquid.

A glass non-woven fabric having a basis weight of 100 g / m ² treated with an epoxy resin binder was impregnated with the treatment liquid to obtain a resin ratio of 1000.
%, And then dried to obtain a molding sheet. Further, a titanium oxide-mixed paper having a basis weight of 55 g / m ² was impregnated with an impregnating liquid containing 2% of PTS as a curing agent and 0.1% of a releasing agent in the initial condensate to make a cosmetic sheet having a resin ratio of 80%. Got Two of the molding sheets are stacked on the inner side, one of the cosmetic sheets is stacked on each of the front and back sides, and stainless specular plates are stacked on both sides.
It was hot pressed at 0 ° C. and 80 kg / cm ² to obtain the decorative material of the example.

The measured values of the decorative material by the following test method are shown in the table.

<Comparative Example> An initial condensate of a melamine resin prepared by converting 3 mol of formaldehyde into 1 mol of melamine in a weak alkali and condensing under acidic conditions to prepare a 120 g / m ² titanium oxide-blended paper with a resin ratio of 120 wt%. I got a makeup sheet. Seven sheets were stacked and hot pressed in the same manner as in the example to obtain a melamine resin decorative plate (thickness: 1.2 mm) as a comparative example. The melamine resin decorative board and a commercially available decorative asbestos slate board (thickness 4 mm, surface unsaturated polyester resin coating) were measured by the following test methods as Comparative Examples (1) and (2). .

Test method Non-combustible (surface) test: Dimensional change rate according to the surface test method of JIS A 1321 (flame retardancy test method for interior materials and construction methods for buildings): JIS K 6902 (thermosetting resin decorative board test method) dimensions According to the rate of change measurement method Warpage: Warpage after 1 month after production / length (unit: mm) is measured Machinability: Cut with a rotary (3000 rpm) cemented carbide tool and judge by the presence or absence of a chip in the cut part (○ no chipping) × There is a chip)

Claims (2)

[Claims] 1. A porous sheet such as paper, non-woven fabric, cloth, etc. made of inorganic fiber, which is made of melamine resin, aluminum hydroxide, and a polymerizable monomer or its oligomer or a thermoplastic resin emulsion. A plurality of molding sheets impregnated with a composition comprising a modifier are laminated and molded, and the composition ratio of the melamine resin and the aluminum hydroxide is 5 to 40 wt% to 95 to 60 wt%. Cosmetic material characterized by being 2. The decorative material according to claim 1, which is formed by stacking thermosetting resin-impregnated paper on the front surface or front and back surfaces of the molding sheet.