JPH04338534A - Manufacture of decorative sheet - 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]

0001

[Industrial Application Field] The present invention can be applied to, for example, furniture, walls,
The present invention relates to a decorative material used as a surface material for floors, etc., and provides a method for producing a decorative material in which a high-strength bond is formed between a paper base material and a clear layer made of vinyl chloride resin. .

0002

[Prior Art] Decorative materials used as surface materials for furniture, walls, floors, etc. include base materials such as titanium paper or tissue paper with printed patterns, and urethane-based materials on the surface of the base material. After forming a clear layer made of vinyl chloride resin on a sheet-like material or a paper base material with a clear layer made of resin, printing, embossing, wiping, etc. of a pattern on the surface of the clear layer. Sheet-like materials with surface treatments are used.

0003

[Problems to be Solved by the Invention] A decorative material consisting of a paper base material with a printed pattern and a clear layer made of urethane resin formed on the surface of the base material is
Because the surface of the clear layer is not suitable for surface treatments such as embossing or wiping, it is not possible to add high design characteristics, and it is also a decorative material in which a clear layer made of vinyl chloride resin is formed on a paper base material. Both have the disadvantage that the lamination strength between the paper base material and the clear layer made of vinyl chloride resin is insufficient, and it is not possible to obtain a decorative material of good quality.

In contrast, the present invention has a paper base material and a clear layer made of a vinyl chloride resin that is suitable for surface treatments such as shaping by embossing and wiping. To provide a method for producing a decorative material, in which a high-strength bond can be obtained between the material and a clear layer made of a vinyl chloride resin.

[0005]

[Means for Solving the Problems] The method for producing a decorative material of the present invention includes a step in which a coating layer of a mixed resin of a resin having a hydroxyl group and a resin having an isocyanate group is formed on a paper base material. step, and a later step of forming a clear layer of vinyl chloride resin, in which the coating layer of the mixed resin in the earlier step is formed by combining the hydroxyl groups of the resin with hydroxyl groups and the isocyanate groups of the resin with isocyanate groups. Equivalence ratio [(-OH)/(-NCO)] is 1
It is formed by using a mixed resin in which a resin having a hydroxyl group and a resin having an isocyanate group are mixed so that the size of the resin is smaller than that of the resin.

[0006] In the method for producing a decorative material of the present invention having the above configuration, the paper base material has a basis weight of, for example, 20 to 1
Titanium paper or thin paper with a weight of about 20 g/m2, preferably 30 to 45 g/m2 is used, and those with various printed patterns or colors are used as desired.

[0007] A coating layer made of a mixed resin of a resin having a hydroxyl group and a resin having an isocyanate group is formed on a paper base material between the paper base material and a clear layer made of a vinyl chloride resin. 1 to 4 g (dry) by gravure printing, etc.
/m2 is formed as a coating layer.

[0008] Specific examples of resins having hydroxyl groups used for forming the coating layer using this mixed resin include acrylic polyol resins, ethylene/vinyl alcohol copolymer resins, polyvinyl alcohol resins, etc. The equivalent ratio of the hydroxyl group of the resin having the and the isocyanate group of the resin having the isocyanate group [(-OH)/
(-NCO )] is mixed with a resin having an isocyanate group at a ratio such that The excess isocyanate groups reacted with are further contained in -OH groups in the cellulose on the surface of the paper base material and in the emulsifier of the vinyl chloride resin in the clear layer formed in the subsequent process.
In order to sufficiently react with OH groups, the isocyanate groups are in large excess with respect to the equivalent of the hydroxyl groups of the resin having hydroxyl groups, that is, the equivalent of the hydroxyl groups of the resin having hydroxyl groups and the isocyanate groups of the resin having isocyanate groups. It is preferable that the ratio [(-OH)/(-NCO)] is 0.9 or less.

[0009] The surface of the mixed resin coating layer may be printed with patterns suitable for decorative materials, such as wood grains, stone grains, patterns similar to patterns on the surface of natural leather, abstract patterns, etc., if necessary. be done.

[0010] These pattern printings are carried out using vinyl chloride resin as a vehicle because it provides high adhesion between the printed surface and a clear layer made of vinyl chloride resin that is formed in a subsequent process. It is preferable to use a printing ink of:

The clear layer made of a vinyl chloride resin is formed of, for example, a vinyl chloride resin or a vinyl chloride/vinyl acetate copolymer resin. , roll coating, curtain flow coating, wire bar coating, reverse coating, gravure coating, gravure reverse coating, air knife coating, kiss coating, blade coating, smooth coating, comma coating, etc. After coating, dry the solvent. Alternatively, by solidifying using gelation reaction by heating, etc., 50 to 20
It is formed as a coating layer of about 0 g (dry)/m2.

[0012] In order to further impart high design characteristics and surface robustness to the surface of the clear layer made of vinyl chloride resin, concave portions are formed using an embossing plate having convex portions, and the inside of the concave portions is colored by a wiping process. Surface treatments such as filling with resin and forming a top coat layer are performed as necessary.

[0013] The above-mentioned formation of concave portions using the embossing plate having convex portions can be performed by creating patterns similar to wood grain, stone grain, patterns on the surface of natural leather, abstract patterns, etc. applied to the paper base material. It is usually formed to match the pattern printing to be expressed, and to resemble, for example, conduit grooves in the grain of natural wood, recesses in stone grain (recesses in travertine), recesses in the corroded pattern surface of metal plates, etc. be.

Furthermore, in the process of forming recesses on the surface of the clear layer made of vinyl chloride resin, the surface of the clear layer is Because a part of the resin adheres to the convex part of the embossed plate and is removed, there is a "resin return", which may cause a bank-like raised part to form at the periphery of the concave part. It is preferable that the flattening process for crushing the burrs is performed using a mirror surface or a matte surface having a group of minute asperities that is sufficiently shallower than the depth of the recessed portion.

[0015]

[Examples] Hereinafter, the specific structure of the method for producing a decorative material of the present invention will be explained based on Examples.

Example 1 A coating layer made of a mixed resin of 20 parts by weight of acrylic urethane resin and 1 part by weight of an isocyanate curing agent was applied to the surface of thin paper "NMT-35: Nagoya Pulp Co., Ltd." with a basis weight of 35 g/m2. was formed using a gravure plate with a plate depth of 60 μm. In addition, the equivalent ratio of the hydroxyl group of the acrylic urethane resin and the isocyanate group of the isocyanate curing agent in the mixed resin used to form the coating layer [(-OH)/(-NCO)
] is 0.5.

Next, a wood grain pattern was printed on the surface of the coated layer made of this mixed resin using a printing ink ``Ka x: Showa Ink Co., Ltd.'', and then the following composition (A) was applied to the printed surface. ) was coated with a paste sol of vinyl chloride resin by the comma coater method, and then heated at 160°C.
, By subjecting it to heat treatment for 3 minutes to form a clear layer with a thickness of 0.1 mm, {paper base material / coating layer made of mixed resin / printed layer with wood grain pattern / clear layer made of vinyl chloride resin. A laminated sheet (B) was obtained.

Composition (A) Vinyl chloride resin “PSL-290: Kanebuchi Chemical Co., Ltd.”
...
・・・・・・100 parts by weight Plasticizer DOP

・・・・・・・・・・・・45 parts by weight Plasticizer
"O-130P: Adeka Argus Co., Ltd."...
・・・・・・5 parts by weight Stabilizer “AC113
: Adeka Argus Co., Ltd.”・・・・・・・・・3
Weight part

After that, the laminated sheet (B)
On the surface of the clear layer of
A decorative material, which is the target product of the method of the present invention, was obtained by printing a wood grain conduit pattern.

Example 2 The surface of the clear layer of the laminated sheet (B) obtained in Example 1 was provided with a concave portion due to the wood grain conduit handle at a heating temperature of the sheet of 160°C, a temperature of the plate surface of the embossing roll of 60°C, Sheet feeding speed 12m/min. After embossing under the following embossing conditions, the embossed surface is further subjected to wiping treatment using wiping ink "W-141: Showa Ink Co., Ltd." to fill the ink into the recesses, and then urethane ink is applied to the wiping surface. Thickness 3 using gloss-adjusting protective ink "Wiping No. 18: Showa Ink Co., Ltd."
A top coat layer of μ was formed on the entire surface to obtain a decorative material which is the target product of the method of the present invention.

Comparative Example 1 After a wood grain pattern was printed on the surface of a thin paper with a basis weight of 35 g/m2 by NMT-35 by Nagoya Pulp Co., Ltd., using a printing ink by ``Kax: Showa Ink Co., Ltd.'' ,
A paste sol of vinyl chloride resin made from the composition (A) used in Example 1 was applied to this printed surface by a comma coater method, and then heat treated at 160°C for 3 minutes to achieve a thickness of 0. A .1 mm clear layer was formed to obtain a laminated sheet (C) consisting of {paper base material/printed layer with wood grain pattern/clear layer made of vinyl chloride resin}.

[0022] Thereafter, a decorative material for comparison was obtained by printing a wood-grain conduit pattern by "Kanx: Showa Ink Co., Ltd." on the clear layer of the laminated sheet (C).

[Experiment] The lamination strength of the decorative materials obtained in Examples 1 and 2 and the decorative material obtained in Comparative Example 1 was determined by the peel strength in a 90° peeling test. The peeling test was conducted on a test piece with a width of 25 mm in an atmosphere at 25°C.

The peel strength of the decorative material of Comparative Example 1 in this test was 0.2 kgf/25 mm, but in the decorative materials of Examples 1 and 2, the laminated elements in the decorative materials were destroyed during the peeling test. Therefore, it was not possible to measure the peel strength.

[0025]

Effects and Effects of the Invention The method for producing a decorative material of the present invention is characterized in that the equivalent ratio of the hydroxyl groups of the resin having hydroxyl groups to the isocyanate groups of the resin having isocyanate groups [(-OH) / (-NCO)] is smaller than 1, and then a coating layer is formed using a mixed resin in which both of these are mixed, and then a clear layer is formed using a vinyl chloride resin. Therefore, the mixed resin layer interposed between the paper base material and the clear layer made of vinyl chloride resin has an equivalent ratio of the hydroxyl groups of the resin having hydroxyl groups to the isocyanate groups of the resin having isocyanate groups [(- OH)/(-NCO)] is smaller than 1, i.e., the hydroxyl group of the resin having a hydroxyl group and the isocyanate group of the resin having an isocyanate group in the mixed resin layer. The coating layer consists of a coating agent containing an excess of isocyanate groups than is required for the reaction with.

Therefore, in the decorative material obtained by the method for producing a decorative material of the present invention, the isocyanate of the resin having isocyanate groups in the coating layer of the mixed resin is smaller than the hydroxyl group of the cellulose in the paper base material. group reacts, and at the same time, the isocyanate group also reacts with the -OH group in the emulsifier in the vinyl chloride resin forming the clear layer. The laminated strength between each layer of the laminated structure is extremely high, and a decorative material of good quality can be obtained.

Claims (1)

[Claims] Claim 1: The equivalent ratio of the hydroxyl groups of the resin having hydroxyl groups to the isocyanate groups of the resin having isocyanate groups with respect to the paper base material [(-OH)/(-NCO
)] is smaller than 1. After forming a coating layer of a mixed resin of a resin having a hydroxyl group and a resin having an isocyanate group, the surface of the coating layer is coated with a vinyl chloride resin. A method for producing a decorative material, which comprises forming a clear layer.