JPS61266242A - Manufacture of decorative material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention involves laminating a decorative sheet such as a thin veneer (decorative veneer) to a base material using an adhesive containing a special filler. The present invention relates to a method for producing beautiful decorative materials.

[Conventional technology]

BACKGROUND ART Decorative materials such as decorative plywood have traditionally been obtained by laminating thin decorative sheets such as thin paper, impregnated paper, thin veneer, and impregnated veneer to the surface of a base material such as plywood or particle board.

However, since the decorative sheet is very thin, the adhesive used to attach it to the base material impregnates the decorative sheet and makes it slightly transparent, so the base material may be dark colored or In addition, if the decorative material has uneven color, the surface of the decorative sheet of the decorative material obtained after application may appear dull or have variations in color, which often reduces the product value. .

Therefore, when the decorative sheet is made of thin paper, impregnated paper, etc., pigments such as titanium white are added to the paper stock during the paper making process to improve its hiding properties. When added, there were many cases in which delamination of the paper occurred or insufficient impregnation.

In addition, as a countermeasure to the above problem, there are cases where the base material is made of a white color, coating the surface of the base material with a concealing agent, bleaching the base material, and even pasting concealing paper. In both cases, the increase in material costs and the number of steps led to an increase in costs.

In addition to the above method, a method of adding a concealing pigment to the adhesive used for pasting is also used, but if the pigment is dispersed in water or a solvent and added to the adhesive, the viscosity of the adhesive decreases. Some pigments are acidic or alkaline, which may inhibit the curing of the adhesive. In many cases, it is difficult to disperse uniformly due to sedimentation, and as a result, it is difficult to obtain the desired effect.

[Problem that the invention seeks to solve]

The present invention is intended to solve the above-mentioned conventional problems, and has a specific gravity similar to that of an adhesive, so it is uniformly dispersed in the adhesive without sedimentation, and exhibits sufficient whiteness and hiding properties. It is an object of the present invention to provide a method for manufacturing a decorative material using an adhesive containing a special plastic powder that does not deteriorate the applicability of rolls.

[Means for solving problems]

The present invention is characterized in that the decorative sheet is attached to the base material using an adhesive mixed with hollow ultrafine particles made of synthetic resin (hereinafter referred to as plastic powder). .

In the present invention, decorative sheets refer to those used for this type of decorative plywood, etc., and include thin paper, impregnated paper in which the thin paper is impregnated with resin, as well as book veneer sliced from precious wood, etc. (decorative veneer) or its impregnated veneer.

Wood grain patterns such as straight grain and board grain are printed on the thin western paper as required.

As the adhesive used in the present invention, those normally used for adhering this type of wood and laminating decorative veneers can be used, and either natural or synthetic resins may be used, but synthetic resins are preferred. preferable. The solvent may be either aqueous or organic. Specifically, examples include epoxy resins, melamine-urea cocondensation resins, melamine resins, area resins, and acrylic resins.

Made of thermosetting resin such as urethane resin or epoxy resin, it is formed into fine particles with a strong hollow structure through core-shell polymerization. Various sizes are used depending on the purpose, but specifically, Particle size α2 to [14μ, hollow inner diameter about 0.05 to 115μ, specific gravity I] and about 7 to 19 are used. Since this plastic powder undergoes a crosslinking reaction, the polymerization is stable, and it has excellent heat resistance, mechanical strength, impact resistance, and weather resistance. Because it has a hollow structure, when mixed with adhesive, light will diffusely reflect and the adhesive will become cloudy and opaque, so it usually appears white.
Improves the opacity of the adhesive layer.

The plastic powder may be added in an amount of 1 to 50 parts by weight per 100 parts by weight of the adhesive, although this will vary depending on the adhesive used. For mixing, add the required amount of plastic powder to the adhesive liquid and mix with a kneader. When mixing, a dispersant or the like may be used as necessary, and other colorants commonly used in this type of technical field, such as dyes,
Pigments and fillers such as extender pigments may be added, but these should of course be used within a range that does not impair the properties of the plastic powder. Since the whiteness of the plastic powder used in the present invention is obtained by scattering light as described above, the binding component resin of the adhesive preferably has a refractive index different from that of the powder.

In addition to being used as an adhesive, this plastic powder can also be mixed into the resin liquid used to impregnate decorative sheets.
When the powder mixed with resin liquid is injected into wood veneers, etc., it also penetrates into the wood conduits, etc., so when used on wood veneers in particular, it creates a beautiful appearance without impairing the original wood feel. You can get something with a nice appearance. In addition, when the decorative sheet is thin paper or the like, the adhesive can also serve as the resin liquid for impregnation.

〔Example〕

EXAMPLES The present invention will be explained below with reference to examples, but the present invention is not limited to these examples.

Example 1 A printed 5,097 m" thin paper was used as a decorative sheet, and the adhesive was 100 parts of melamine-Nilia co-condensed resin adhesive (weight 2 or less) K plastic powder (product name: Boncourt PP J Dainippon) When 5 parts of Ink Kagaku Kogyo (manufactured by Ink Kagaku Kogyo) were mixed in and adhered to 4111 thick lauan plywood with a yellowish and reddish surface appearance,
It was possible to obtain decorative plywood that is almost unaffected by the color of the base material.

Note that the adhesive was applied by roll coating, and the applied amount was 10097 m''.

Example 2 A cedar straight-grain veneer sliced into 115 mm thick slices was used as a decorative sheet, and lauan plywood was prepared using 100 parts of melamine-urea co-condensed resin adhesive mixed with 5 parts of plastic powder (same as in Example 1). When adhered to a particle board substrate using a hot press, a decorative board having the same color tone over the entire surface of the decorative sheet was obtained.

Adhesive application amount 10077/@”, hot press 140℃
, a kg/♂, 1 minute.

Example 3 Unsaturated polyester resin 10 was applied to a sliced straight-grained Japanese pine veneer of 0.15 mrx thickness under a vacuum of 15 Torr.
0 parts, styrene 10 parts, benzoyl peroxide (BPO) 2
Inject the mixed synthetic resin liquid containing the following parts over a period of 5 hours.
I got a makeup sheet. This injected makeup plate is added to Boncourt P.
Using Kuratak N-514 adhesive (manufactured by Daijin Shinko ■: α-olefin resin system) mixed with 10 parts of P (plastic powder), 1.
A decorative material was obtained by hot pressing at 40° C. and a kg/crA for 20 minutes. The obtained synthetic resin-infused decorative material exhibited a beautiful appearance without any unevenness in the shade of the base material, and no adhesion failure occurred. Adhesive application t151.

Comparative Example In Example 3, when a decorative sheet was attached using an adhesive containing 5 parts of titanium oxide instead of plastic powder under the same conditions, the pH of the adhesive decreased to a, O and the curing speed increased. Because the speed was faster, adhesion failure occurred in some areas after pressing.

〔Effect of the invention〕

Claims (4)

[Claims] (1) When attaching a decorative sheet such as a thin veneer to a base material,
1. A method for producing a decorative material, which comprises adhering using an adhesive mixed with ultrafine particles having a hollow structure made of synthetic resin. (2) The method for producing a decorative material according to claim 1, wherein the decorative sheet is thin paper, impregnated paper, thin veneer, or impregnated veneer. (3) The method for producing a decorative material according to claim 2, wherein the decorative sheet is an impregnated paper or an impregnated veneer impregnated with a synthetic resin liquid containing ultrafine particles of the synthetic resin. (4) The method for producing a decorative material according to any one of claims 1 to 3, wherein the base material is a wood base material.