JPS5929065A - Paint and painting method for coloring indentation of natural leather by using colored resin powder - Google Patents

Abstract

PURPOSE:To improve artistic quality by coating a resin which contains a resin, a coloring pigment and a dye, has specific particle sizes and does not dissolve or soften in water on natural leather, and wiping away the powder sticking to projecting parts then coating a paint contg. an org. solvent which dissolves or softens said resin thereon. CONSTITUTION:Resin powder which consists of powder contg. a resin, a coloring pigment and a dye and having 1-300 micron particle sizes and does not dissolve nor soften in water is prepd. Epoxy, polyester copolymer, styrene copolymer and other resins are used as the resin, and carbon black, chrome yellow, titanium oxide, etc. are used as the coloring pigment. Oil soluble dyes are used as the dye. Such resin powder is coated as it is or kneaded with or water or an org. solvent which does not dissolve nor soften the resin on a natural leather. The powder on the projecting parts is wiped off so as to allow only the powder to remain in the indentations, whereafter a transparent or semitransparent paint contg. an org. solvent which dissolves or softens the resin in the powder is coated thereon.

Description

[Detailed Description of the Invention] The present invention is easier than conventional methods in painting the pores and wrinkles of natural leather or the valleys of patterns in embossed leather to create an artistic effect by coloring them in a different tone from other parts. , relating to a coating method that quickly and economically achieves the objective, and that also allows the finished product to have even better physical properties such as water resistance, color fading prevention, bending resistance, flexibility, feel, etc., and the same paint. .

The conventional technique of painting only the pores and wrinkles of natural leather in a different color from the rest of the leather, especially painting techniques that give it an aged look by coloring it black or a dirty tone close to black, is known as ``antique finishing'' or ``attovantic finishing.'' It was painted using the methods (A) and CB) described below.

(A) Priming with a water-based paint containing a synthetic resin emulsion binder, pigment paste, or dye that produces a soft, crack-resistant coating, and coated with lacquer or T-T glue to facilitate the subsequent wiping process. Apply yin as a medium coat. Next, apply only the pigment paste containing almost no emulsion binder by diluting it with water, and after drying, apply the pigment paste.
A method of wiping off the convex portions (D jJ 5- heath), leaving color paste on only the four portions, coloring them, and then overcoating with a solvent-based paint such as lacquer, lacquer emulsion, or urethane paint.

CB) On top of the same undercoat as in the previous example, a lacquer thick enough to withstand polishing, lacquer emulsion is coated with urethane paint, and then mixed with silica or metal stearate to make it easier to polish. A method of applying lacquer and polishing off the colored lacquer on the convex parts using a polishing compound, a cloth with abrasives, a rotating puff, etc., leaving only the colored lacquer on the four parts.

Although method (A) is simple, it leaves an intermediate layer containing only a water-soluble color paste and almost no emulsion binder, resulting in poor water resistance of the finished leather and insufficient adhesion and bending resistance.

Method (B) involves covering the entire surface of the leather with colored lacquer and then polishing off the paint on the protrusions, which requires a lot of effort and results in a large loss of brown lacquer. In order to prevent the leather from being polished, a considerable thickness of lacquer, lacquer emulsion, or urethane paint is applied to the leather, making the finished leather hard and giving it a poor feel.

In the coating method of the present invention, natural leather is prime coated with a flexible, crack-resistant water-based paint containing a synthetic resin emulsion binder, pigment paste or dye, and then a thin layer of lacquer or lacquer emulsion is applied directly or as an intermediate coat to the coated surface. After stopping the adhesion and staining the painted surface of the leather, apply a particle size of 1 to 300 μm containing resin, pigment and/or dye.
Preferably, a resin powder consisting of a powder of 5 to 70 μm that does not dissolve or soften in water is used as a powder, or the powder is mixed with water or an organic solvent that does not dissolve the resin in the powder, and an appropriate color that dissolves therein. After applying the mixed paint and wiping off the powder that adhered to the convex parts,
It is characterized in that it is overcoated with a paint containing an organic solvent that dissolves or softens the resin in the powder.

The particle size of the powder is coarser than that of ordinary pigment powder, and therefore the gaps between the powders are large, and the top coat easily penetrates into the gaps between the powders, forming a single layer of intermediate coat or base coat, or a synthetic resin. In addition to dissolving the emulsion layer and strongly adhering it, the resin contained in the powder dissolves or converts into organic solvent contained in the top coat, so each particle of the powder strongly adheres to the top coat. .

In particular, when selecting a resin in the powder that is soluble in the solvent of the top coat and has good compatibility with the resin in the top coat,
The powder dissolves and integrates with the top coat and strongly adheres directly to the base coat or to the intermediate coat, resulting in a strong finish that is highly water resistant and does not fade. If it sticks out from the membrane and remains rough,
The gloss will not fade and you can refinish it to a smooth and comfortable finish.

If the particle size of the powder is less than 1 pm, it may penetrate into the very fine scratches and parts of the leather's convex parts, making the entire leather dirty and making it difficult to wipe off the convex parts.
If it exceeds 1, it does not get into pores or fine wrinkles and is inappropriate for the purpose of the present invention.

In addition, since there are differences in the pores and wrinkles of cowhide, which are medium in pores and wrinkles in steer and fur fur, and rough in pul and ox skin, the optimum particle size of the powder is strictly speaking finer than leather. Although it differs depending on the type, as a result of various studies, good results were obtained when using one with a diameter of 1 to 300 μm, preferably 5 to 70 μm.

A method of dispersing color pigments and dyes in a resin that is dissolved or softened with an organic solvent to create an integrated composition, and a method of pulverizing this and further classifying it according to particle size to obtain the desired particle size. , compositions for various other purposes, such as nitrified cotton chips, vinyl chips, GAB chips, p-zine modified maleic acid resin coating pigments, nitrocotton coating pigments, polyvinyl chloride coating surface r (, powder coatings for powder coatings, This is a well-known method for producing powder toner for electrostatic copying machines.

The resin in the powder used in the present invention is water-insoluble, and is ester-based, ketone-based, hematosol-based, aromatic, etc. contained in the solvent-based leather paint to be overcoated, that is, lacquer, lacquer emulsion, or urethane paint. It is preferable to use one that dissolves or softens in a mixture of group hydrocarbon solvents and has good affinity with the resins in these paints.

If a water-soluble resin is used as the resin contained in the powder, not only will the water resistance of the finished leather decrease, but also the solubility in the organic solvent in the top coat and the compatibility with the resin in the top coat will decrease. If the powder is dispersed in an aqueous resin solution and applied, the powder dissolves or softens in water, making it difficult to achieve the object of the present invention, which is not preferred.

Therefore, as a result of examining various resins, good results were found for the resins contained in the powder used in the present invention. The coloring agents used in the powder include black pigments, colored pigments, and oil-soluble dyes.

Carpa as an inorganic pigment for coloring pigments? There are 45 pigments such as black, red, yellow, titanium oxide, ocher, blue, and ultramarine, and the 45 pigments include cyanine blue, cyanine green, black pigment red, quinacridone red, and pentidine yellow.

When classifying dyes according to their dyeing properties, they are directly 1! F) Acidic dyes, basic dyes, mordants, acid i biomordants (, sulfurized vat dyes, vat dyes, soluble vat dyes, azoic dyes, 11'Til'' dyes, reactive dyes F), fit (E
l! RL, a fluorescent brightener, and an oil-soluble dye; to color the powder, the last MII
i'8-stained rE is preferred.

There are various types of oil-soluble dyes, such as anthiraquinone type, phthalocyanine type, monoazo type, disazo type, metal elJ salt to 7/azo type, and triallylmethane type.

In carrying out the present invention, even if the powder is applied as a powder to leather that has been primed or intermediate coated, it is still sufficient to improve the properties and betting performance of the leather. It is difficult to store an appropriate amount of non-adhesive powder in the leather opening 5.

Therefore, to the extent that it does not prevent the top coat containing the organic solvent from penetrating into the gaps between the acid powder, the powder should be fixed on the top coat or intermediate coated leather surface before applying the top coat, and the powder attached to the convex parts can be removed. In order to adhere lightly to the extent that it can be easily wiped off, we have developed this powder (paint for coloring four parts of leather using the powder of the present invention).

The powder is kneaded with an aqueous solution of a water-soluble resin as shown below, or an organic solvent that neither dissolves nor softens the resin contained in the powder, and these substances are added before coloring to color the leather. paint for use.

Water-soluble resins include casein, albumin, gelatin, shellac, OMO, methylcellulose, 1llx0,
Examples include polyvinyl alcohol, BoIJ oxyethylene, styrene-maleic acid copolymer resin, and sodium alginate.

If a certain kind of epoxy resin is selected as the resin in the powder, alcohol and petroleum-based solvents do not dissolve or soften this resin, so alcohol and petroleum-based solvents are used. It is possible to make a paint for coloring the four parts of leather.

In addition, if you choose a urethane elastomer-based paint that can be applied directly to the leather without an undercoat or G-intermediate coating as a solvent-based paint for topcoating, you can use the powder or paint for coloring the four parts of leather using the powder as an undercoat or G-intermediate coating. It is possible to paint directly onto the leather without

When producing a paint for coloring four parts of leather using the powder, it is not necessary to further crush the powder into fine particles; rather, it is only necessary to lightly agitate the particles to prevent them from being crushed, and mix them uniformly for the purpose. EXAMPLE 1 The present invention will be specifically explained with reference to examples.

Example 1 (Adjustment of base leather) Cow steer silver leather restored with chrome red synthetic tannin,
Commercially available color paste for leather) 100 parts (heavy FJL part,
(Same below), protein lq, 40 parts of a leather auxiliary agent, and 180 parts of an acrylic acid ester emulsion binder with a solid content of 40%, diluted with 200 parts of water, coated once with a brush, and then sprayed twice. After drying, apply lacquer clear 10061 (lacquer thinner 25
A thin layer of 0 parts of the mixture was applied by vertically and horizontally spraying to obtain a base coated and intermediate coated base leather.

Powder of a polyester synthetic resin having a particle size of 10 to 70 ILm containing 7% by weight of carbon black as a coloring pigment and 10% by weight of precipitated barium sulfate as an extender pigment was applied uniformly to the base leather with a brush, and then the cloth was rolled up. After wiping off the powder on the protrusions while rubbing it in with a cloth, a top coat of 100 parts of skin moisturizing solvent lacquer emulsion clear dissolved in 200 parts of lacquer thinner was applied by spraying.

The result was a beautiful, ancient-colored leather with black pores and wrinkles, and satisfactory performance in terms of water resistance, bending resistance, feel, flexibility, and durability.

Example 2 55 parts of styrene-acrylic copolymer resin powder with a particle size of 5 to 25 μm containing 10% by weight of carbon black as a coloring agent, 1% by weight of anthraquinone thread blue oil-soluble dye, and 64.5 parts of a 1% aqueous solution of high viscosity methyl cellulose 2fiff. Part contains 0 polyethylene glycol alkyl ether dispersant
．． 5 parts were added, stirred and kneaded to obtain a paint for coloring four parts of leather.

Adding 100 parts of water to 100 parts of this paint, Example 1
Paint the base leather with a brush, and after drying, wipe off the excess powder adhering to the convex parts with a cloth, then apply Lacquer Clear 10 for Leather.
A top coat of 0 parts dissolved in 200 parts of lacquer thinner was applied by spraying and dried.

The finished leather was the same as that seen in Example 1, and was changed to one that satisfies both appearance and betting performance.

Example 3 50 parts of an epoxy resin powder with a particle size of 15 to 80 μm containing 5% by weight of carbon black and 10% by weight of Bengara as coloring pigments was stirred and dispersed in 50 parts of a 5% by weight inopropanol solution of butyral resin. It was used as a paint for coloring four parts of leather.

100 parts of this paint and 50 parts of isopropanol were sprayed over the base seedling soil of Example 1, and after drying, the powder adhering to the protrusions was wiped off with a cloth slightly dampened with isopropanol, and then urethane was applied. Clear 1 for elastomer leather
00 parts, 15 parts of hardener for the same paint, 1 part of special thinner for the same paint (MKK 60% by weight, Dorol 20 weight)
The mixture was diluted with 250 parts of 10% by weight of Shikuta hexanone and 10% by weight of cellosolve acetate, coated with a spray and dried.

The leather finish has been changed to satisfy both appearance and performance.

Claims (1)

[Scope of Claims] 1. A resin that does not dissolve or soften in water, which is made up of a powder containing a resin, a coloring pigment, and/or a dye and has a particle size of 1 to 600 μm; A four-part coloring paint for natural leather that is kneaded with a non-softening organic solvent and a coloring agent that dissolves in these. 2. Consists of powder with a particle size of 1 to 600 μm containing a resin, a coloring pigment, and/or a dye. A resin powder that does not dissolve or soften in water is used as a powder, or the powder is kneaded with water or an organic solvent that does not dissolve or soften the resin in the powder, and a color vehicle that dissolves in these. Apply it to the leather as a paint, then wipe off the excess powder from the convex parts so that the powder remains only in the four areas of the leather such as pores and wrinkles, and then add an organic solvent that dissolves or softens the resin in the powder. A natural leather coating method characterized by topcoating with a transparent or translucent paint.