JPS6142373A - Formation of suede or felt like texture pattern - Google Patents

Abstract

PURPOSE:To economically and simply form a suede or felt like pattern, by coating a composition, which is prepared by compounding piles or plastics with a polyurethane resin as a filler, by spraying. CONSTITUTION:10-20pts.wt. of a pile with a denier of 3 or less and/or a plastic or cellulose powder with a particle size of 100mum or less is compounded with 100pts.wt. of a polyurethane resin consisting of 100pts.wt. of a polyurethane elastomer and 50pts.wt. or less of an isocyanate prepolymer. The obtained paint is sprayed to form a fibrous film. By this method, a suede or felt like texture pattern can be formed simply and economically.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention forms a fibrous coating film having a suede-like or felt-like texture and pattern by spray painting on a base material such as a plastic film, sheet, molded product, etc. Concerning how to do so.

BACKGROUND ART Conventionally, it has been known to impregnate a nonwoven fabric, a raised fabric, or the like with a resin such as polyurethane to form a pattern having a suede-like or felt-like texture. However, this method is extremely complex and requires a high level of skill. On the other hand, it is difficult to impregnate plastic films, sheets, and molded products with resin, and it is difficult to form patterns with suede-like or felt-like textures using the above-mentioned method. As one method to solve these problems, it has been considered to create a suede-like or felt-like texture and pattern by electrostatically flocking onto the base material of plastic films, sheets, molded products, etc. Therefore, it is difficult to perform partial surface finishing on objects with three-dimensional base materials or molded objects, and there are also problems in terms of installation.

In order to solve these problems, the inventors of the present invention made extensive studies and found that it is economical and relatively easy to form a suede-like or felt-like pattern, and completed the present invention.

That is, the present invention provides polyurethane elastomer 100
100 parts by weight of a polyurethane resin consisting of 10 parts by weight and 50 parts by weight or less of an organic isocyanate prepolymer, and 10 parts by weight or more and 200 parts by weight or less of pile of 3 denier or less and/or plastic or cellulose powder of 100 μ or less as a filler. , and a solvent if necessary,
This method of forming a suede-like or felt-like pattern is characterized by forming a fibrous coating film by spray painting a paint containing a filler, additives, etc.

Examples of the polyurethane elastomer used in the present invention include polyester polyols and/or polyether polyols and/or polyester-bolyether polyols and/or polyhydric alcohols having a number average molecular weight of about 300 to 3,000, such as ethylene glycol, Propylene glycol, 1,4-butanediol, 1,3-butanediol, 1,5-bentanediol, 116-hexanediol, glyceripetrimethylpropane, etc., and organic incyanates such as toluene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, etc. A prepolymer obtained by reacting isocyanate, naphthylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, lysine diisocyanate, dicyclohexylylene diisocyanate, etc. under conditions where the equivalent ratio of incyanate groups to hydroxyl groups is 1 or more, and further Examples include elastomers obtained by reacting a chain extender under conditions where the amount is more than or equal to the equivalent amount of the isocyanate group.

Chain extenders used in this case include, for example, the above-mentioned polyhydric alfurs, aliphatic diamines such as ethylene diamine and hexamethylene diamine, aromatic diamines such as F-lylene diamine, metaphenylene diamine, and xylylene diamine;
Examples include alicyclic diamines such as isophorone diamine and dicyclohexylmethane diamine.

41 The number average molecular weight of the polyurethane elastomer used in the present invention is not particularly limited, but from the viewpoint of finished appearance etc. It is preferable to use something within this range.

In the present invention, organic incyanate prepolymers include, for example, polyester polyols and/or polyether polyols and/or polyester-polyether polyols and/or low molecular weight polyhydric alcohols having a number average molecular weight of about 300 to 3,000, e.g. Organic isocyanates such as ethylene glycol, propylene glycol, 1,4-butanediol, 113-butanediol, 1,5-bentanediol, 1,6-hexanediol, glycerin, trimethylolpropane, neopentyl glycol, etc. For example, toluene diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, naphthylene diisocyanate, hexamethylene diisocyanate, inphorone diisocyanate, lysine diisocyanate, cyclohexylmethane diisocyanate, etc., and the equivalent ratio of hydroxyl group to incyanate group is 1 or more, preferably 1.3. A prepolymer obtained by reaction under conditions of ~2.5 is used.

Among these prepolymers, a widely known prepolymer is a polyisocyanate having three or more isocyanate groups per molecule obtained by reacting 3 moles of the above-mentioned noisocyanate with 1 mole of water or trimethylolpropane. Compounds, for example, polyisocyanate consisting of hexamethylene diisocyanate/water = 3/1 (mole ratio) (Olestar NPiOOO1 manufactured by Mitsui Toatsu Chemical Co., Ltd., trade name), hexamethylene diisocyanate
) /) Polyisocyanate (Olestar NP-2000, trade name manufactured by Mitsui Toatsu Chemical Co., Ltd.) consisting of limethylolpropane = 3/1 (mole ratio), isoborone diisocyanate / water = 3/1 (mole ratio) Polyisocyanate (T-1890, manufactured by West German Huls AG, trade name), toluene diisocyanate/trimethylolpropane = 3/1
(Molar ratio) polyisocyanate (Desmonyur I-75, manufactured by Bayer AG, trade name), etc. can also be mentioned.

In the present invention, the blending ratio of the polyurethane elastomer and the organic isocyanate prepolymer is in the range of 50 parts by weight or less based on 100 parts by weight of the polyurethane elastomer. More preferably, the amount is in the range of 5 parts by weight or more and 30 parts by weight or less. If the amount of the organic isocyanate prepolymer is less than 3 parts by weight, the finished pattern will have poor chemical resistance, solvent resistance, abrasion resistance, and adhesion to the material. Moreover, when the amount is more than 50 parts by weight, the appearance and texture of the finished pattern becomes hard, which is not good.

The pile used as a filler in the present invention may be normally made of rayon, nylon, polyester, polyacrylic resin, etc. and has a pile shape with a diameter of 3 deniers or less and a length of 2 m111 or less, but commercially available Examples of piles are 1゜5dX0.3mm, 1.5
dX0.6+n+n, 2. OdXlmm, 2.0dX1
．． 3mm, 3.0dX0.8m, 3.0dX1゜5cm,
1. (MXf), 4 mm, 1.0 dX 0.8 mm, 0°75 d I can do it. When a particularly good painted appearance is required, it is better to use a mixture of piles of various sizes. In addition, the plastic materials used in the present invention include nylon, polyester, acrylic, melamine resin, polyurethane resin, phenol resin,
The urea resin and cellulose powder are made of pulp cellulose, etc. and have a particle size of 100μ or less, preferably 8()μ.
The following powders are recommended. Although these powders can be used alone or as a mixture of various sizes, it is preferable to use pile and powder in combination from the viewpoint of spray workability and coating appearance.

The blending ratio of these piles and/or plastic paragus is in the range of 10 parts by weight or more and 200 parts by weight or less, preferably 50 parts by weight or more and 150 parts by weight or less, based on 100 parts by weight of the polyurethane resin. Therefore, this ratio is 1
When it is less than 0 parts by weight or more than 200 parts by weight,
In either case, it is not possible to obtain a good pattern.

In the present invention, in addition to the above, solvents necessary for adjusting coating viscosity, etc. during coating, such as ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone, esters such as ethyl acetate and butyl acetate, toluene, and kijirole, etc. Additives such as aromatic solvents, fillers such as charcoal, silica, titanium oxide, talc, pigments, coloring dyes, flame retardants, surface conditioners, dispersants, etc.
They can also be used in combination as long as they do not impede the effects of the present invention.

The paint thus obtained can be spray coated by a conventional coating method such as air spray, airless spray, or electrostatic coating. The suede-like or felt-like pattern of the present invention can be obtained by applying one coat or repeating several coats so that the coating thickness is usually about 0.3111 m to 2 mm.

In the present invention, the material to be coated is not particularly limited, but after surface treatment and undercoating as necessary, on plastic molded products, sheets and films such as vinyl chloride, polystyrene, ABS resin, polyethylene, polypropylene, PET resin, etc. Painting is common.

The pattern obtained in this way can be finished by setting the paint film at room temperature until it hardens, or after setting it for 0.5 minutes to 1 hour after painting, it can be finished at 40°C to 12°C.
It can also be finished by baking and hardening in an atmosphere at 0°C.

The thus obtained coated product having a suede-like or felt-like pattern has an excellent visual appearance and texture and is used for various purposes such as architectural interior materials and automobile interior materials.

The present invention will be explained below with reference to Examples and Comparative Examples, and unless otherwise specified, parts in the examples refer to parts by weight, and % refers to % by weight.

Production Example 1 200 parts of a polyester polyol (condensation product of 1,4-butanediol and adipic acid) with a molecular weight of 2000 and a molecular weight of 1000 were placed in a four-necked 7-rasf equipped with a stirrer, a thermometer, a reflux condenser, and a nitrogen gas introduction device. Polyester polyol (condensate of 1,4-butanediol and adipic acid)
100 parts, 89 parts of isophorone diisocyanate) and 260 parts of toluene were added, and while introducing nitrogen gas, 100 parts of
The reaction was carried out for 4 hours at 'c. The obtained prepolymer is NCO
It was 4.2% (calculated as solid content). After this prepolymer was cooled, it was diluted with ethyl acetate so that the nonvolatile content was 30%. 30 parts of isophorone diamine was added to this to obtain a polyurethane elastomer having a viscosity of 200 voids. Furthermore, 10 parts of isopropyl alcohol was added to treat the remaining NGOs. The obtained polyurethane elastomer is referred to as (A).

Production Example 2 In a four-necked 7-rasf equipped with a stirrer, thermometer, reflux condenser, and nitrogen gas introduction device, 220 parts of polyether polyol (polypropylene glycol) with a molecular weight of 1000, 46 parts of trimethylolpropane, 325 parts of isophorone diisocyanate, Add 200 parts of Kijirole and 200 parts of cellosolve acetate and heat to 80% while introducing nitrogen gas.
The reaction was carried out at ℃ for 5 hours. The obtained prepolymer had an NCO content of 6.1% and a nonvolatile content of 60.2%. The obtained prepolymer is designated as (B).

Example 1 To 333 parts of the polyurethane elastomer obtained in Production Example 1,
As a prepolymer, 13.3 parts of Orestar NP-2000 (manufactured by Mitsui Toatsu Chemical Co., Ltd., trade name, non-volatile content 75%), 30 parts of nylon pile 1.5dX0.3m0, 1.0d
Add 20 parts of
It was diluted with 220 parts of a mixed solvent of 0. The blending ratio of paint is
The solid content ratio of polyurethane elastomer: Brevolimer: filler = 100:10:100. The obtained paint was applied by air spraying at a coating pressure of 4 (') kg/cm' to a coating film thickness of 40 kg/cm on an ABS molded sheet.
It was coated to a thickness of 0μ to 600μ. After coating, it was left at room temperature for 30 minutes and then cured for 30 minutes in an atmosphere of 80'C.

The evaluation results of the obtained painted objects are shown in Table-2.

Examples 2 to 5 and Comparative Examples 1 to 6 Paints were manufactured in the same manner as in Example 1 using the formulations shown in Table 1. Next, it was painted and cured in the same manner as in Example 1. The evaluation results are shown in Table-2.

Claims (1)

[Claims] 100 parts by weight of a polyurethane resin consisting of 100 parts by weight of a polyurethane elastomer and 50 parts by weight or less of an organic isocyanate prepolymer, and 10 parts by weight or more and 200 parts by weight of pile of 3 denier or less and/or plastic or cellulose powder of 100 μ or less as a filler. A method for forming a suede-like or felt-like pattern, which comprises spraying a paint containing the following ingredients to form a fibrous coating film.