JPS60149457A - Precoated decorative sheet for recoating - 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] This invention company's pre-coated cosmetic seal for repainting) K is concerned.

As a painting method for finishing the surfaces of furniture, etc.

There is a method of applying paint directly to the base material of furniture, etc., and a method of repainting the decorative sheet with resin after laminating the surface of the plywood base material of furniture, etc. with a sheet with wood grain patterns etc. This is called a decorative sheet for repainting decorative sheet lines.

By the way, mild materials have conventionally been used as decorative sheets for repainting.

For example, there is a pre-coated paper type that is coated with urethane or amino alkyd resin as a decorative sheet for repainting that is laminated onto base materials such as plywood that make up furniture, etc.
Special Publication No. 49-46041, etc.).

However, when this decorative sheet for repainting is repainted, the adhesiveness between the repainting resin and the top resin of the precoated paper made of the above-mentioned resin is poor, and the sheet peels off at the interface.

On the other hand, the decorative sheet for repainting itself is an after-coated paper type which is not coated with a top resin and does not have a mating surface retention layer. However, this decorative sheet for repainting has the drawbacks of high cost due to ink peeling during the lamination process, transportation, and storage, uneven resin impregnation during repainting, and increased amount of bait resin.

There is also a method of laminating this after-coated paper type decorative sheet for repainting, then rolling cordon with amino alkyd resin from which slip agents such as silicone have been removed, and then repainting. The drawbacks are that it is time-consuming and expensive, and that the selection of repainting resins is limited and lacks versatility.

The present invention was developed in view of the above, and it is possible to prevent penetration of a repainting resin during application, and to obtain a high-grade finish and texture with a small amount of application.

To provide a pre-coated decorative sheet for repainting which is highly selective in the type of resin for repainting.

That is, 1 the present invention is a printing base sheet having a cellulose component as at least one component, and a pattern is applied on the printing base sheet using a printing ink having a cellulose resin as at least one of the vehicle components. The gist is a pre-coated decorative sheet for repainting that is coated with a top coat containing a polyol component, an isocyanate component, and a cellulose component.

Hereinafter, nine embodiments of the present invention will be described based on the drawings.

The printing base material sheet 2 constituting the precoated decorative sheet 1 for repainting according to the present invention may be any material as long as it has a cellulose component as part or all of its constituent components and can be used as a printing base material. however.

It is preferably a sheet having a paper waste structure, preferably a sheet having a weight of about 23 to 120 g/-. 231
If it is less than 17 m, printing ink tends to bleed through and lack of hiding power. 1201! If it exceeds /rrl, the top coat will be sucked in. It is difficult to keep it on the surface layer and also increases the cost. As cellulose-based components, in addition to pure cellulose, hemicellulose, or chemically modified cellulose such as nine-nitrate cellulose, cellulose acetate, hydroxymethylcellulose, carboxymethylcellulose, etc. can be used, and these can be used alone or in combination to form a sheet. The constituent components of Ingredients other than cellulose components are 1
For example, titanium dioxide or various early materials, thermoplastic resins,
Thermosetting resin, latex.

Starch or other additives may be used.

By having the printing base sheet having the above configuration.

It is possible to produce a product that has an excellent printing effect using the printing ink described below, has a good coating effect with the top coat paint that will be described later (3), and can effectively prevent penetration of repainting resin.

A desired pattern is printed on the printing base sheet 2 as described above to form a printing ink layer for the pattern, but if necessary, a solid printing ink may be added below the printing ink layer 4 for the pattern. By forming the layer 8 in advance, the printing effect of the pattern can be improved.

The pattern printing ink constituting the present invention is an ink having a cellulose resin as part or all of the vehicle component.

Examples of cellulose resins include nitrified cotton alkyd resin,
Vinegar [2 sets #CI-su, hydroxymethylcellulose,
Carboxymethylcellulose and the like are used, but are not particularly limited. By using this type of cellulose resin as part or all of the constituent components of the vehicle, the printing effect on the printing base sheet having the above-mentioned cellulose component as part or all of the constituent components is excellent. , and is sufficiently hidden by painting with the top coat described below, so that the top coat does not peel off from the printed area. Cellulose (
4) Examples of resins other than resin include vinyl chloride resin,
Acrylic resin, polyester resin, polyvinyl butyral resin, polyurethane resin, etc., or copolymers thereof may be used alone or in combination.

A top coating material is applied onto the printing ink layer for the above-mentioned pattern to form a top coating layer 5.9 The top coating material constituting the present invention consists of three components: a polyol component, an isocyanate component, and a cellulose component. It is a transparent resin.

As the polyol, polyvinyl chloride polyol, acrylic polyol, polyester polyol, polyether polyol, etc. are used.

Isocyanates include tolylene diisocyanate, methylene diisocyanate, xylene diisocyanate,
Hexamethylene diisocyanate and the like are used.

As the cellulose component, nitrified cotton, cellulose acetate, hydroxymethyl cellulose, carboxymethyl cellulose, etc. are used. The cellulose component provides abundant hydroxyl groups or functional groups as a component of the top coat, and not only increases the affinity with the recoating resin through chemical bonding, but also has an affinity with the underlying printing base sheet and printing ink. 9. Develops strong interlaminar strength.

As the cellulose component, nitrified cotton is preferably used. Nitrified cotton provides an excellent effect in terms of interlayer reinforcement through reaction with incyanate, and is also advantageous in terms of cost.

The ratio of the polyol component to the incyanate component may be the theoretical blending ratio of urethane bonds, but it is preferable that the incyanate component is present in an amount of 5 to 20% by weight than the theoretical blending amount. This is because the incyanate component causes intermolecular bonds with the printing base sheet, the cellulose component of the printing ink, or the repainting resin component, and the printing base sheet layer.

This is because it is thought to have the effect of strengthening the interlayer between the printing layer or repainting resin layer and the top coating layer. In addition, the cellulose component includes a polyol component and an isocyanate component, totaling 10
There is an overlapping part of 20 to 40 parts by weight for 0 parts by weight.

At less than 20 parts, the cellulose component reacts with the incyanate component in the top coat and is consumed.

It has poor affinity with the resin component for repainting, and the resin layer for repainting is likely to peel off.

On the other hand, if the overlap exceeds 40, the bond density of the urethane bonds in the top coat layer will be low and the interlayer strength as a whole will decrease. As the solvent for the top coating, aromatic, ketone, ester, etc. are used alone or as a mixed solvent.

As the aromatic system, for example, toluene, xylene, etc. are used. Examples of ketones used include methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone. Examples of esters used include methyl acetate, ethyl acetate, butyl acetate, and the like.

The coating method for the top coat is the gravure coating method.

A four-coat method or the like can be used.

Although the coating amount is not particularly limited, a coating amount of 5 Jildry/m or less gives preferable results in terms of the coating effect of repainting.

The decorative sheet for repainting (7) of the present invention having the above-described structure is laminated onto the base material 8 of the furniture floor through the adhesive layer 7.

Then, a repainting resin is applied from above the top coating layer 5 of the laminated precoated decorative sheet for repainting to form a repainting resin layer 6.

Next, specific examples of the present invention will be shown.

Example: Tissue paper (pre-coated base paper manufactured by Nagoya Co., Ltd.) with a basis weight of 301/rrl was used as the printing base sheet, and printing ink (various ink type) using nitrocotton alkyd resin as the vehicle was used.
MA), using a rotogravure press.

A concealing solid coat and pattern printing were applied.

Next.

When a top coat with a formulation consisting of:

The above pre-coated decorative paper for repainting was adhered to a +2.7mm thick plywood base material (manufactured by Noda Plywood) using a vinyl acetate adhesive (AC315 manufactured by Chuo Rika ■), and then acrylic lacquer was applied. When spray painting was performed using a sprayer (touch-up spray manufactured by Lloyd Kagaku ■) at 10 Ji'dry/-, a deep coated plywood was obtained.

As is clear from the above examples, a printing base sheet having a single paper waste structure is printed with a kneading property using a printing ink containing a nitrified alkyd resin as a vehicle, and then polyester polyol, xylene diisocyanate, and nitrified cotton are added as components. By applying a top coat of paint, a precoated decorative sheet for repainting with high durability over time and excellent repainting effect was obtained.

As explained above, according to the present invention, a pattern is printed on a printing base sheet having a cellulose component as at least one of the components using a printing ink having a cellulose resin as at least one of the vehicle components. By applying a top coat containing a polyol component, an isocyanate component, and a cellulose component as constituent components after printing, it has unprecedented durability over time.

Excellent penetration prevention properties of repainted resin and a good finish.

It is now possible to provide a pre-coated decorative sheet for repainting that has high adhesion to the repaint resin and is highly selective for the repaint resin.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a pre-coated decorative sheet for repainting according to the present invention, and FIG. 2 is a schematic cross-sectional view of an example of use of the pre-coated decorative sheet for re-painting according to the present invention. 1---------1 Grecod decorative sheet for repainting 2-
---------1 Printing base sheet 4--Printing ink layer 5--1 Top coat layer (11) Figure 1 Figure 2

Claims (1)

[Scope of Claims] A pattern is applied on a printing base sheet having a cellulose component as at least one of the components using a printing ink having a cellulose resin as at least one of the vehicle components. To. A pre-coated decorative sheet for repainting characterized by having been coated with a paint containing a polyol component, an isocyanate component, and a cellulose component.