JPS6015753B2 - Manufacturing method for vivid and darkly colored artificial leather - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing artificial leather that is vividly and purulently colored.

More specifically, the present invention forms a finishing layer containing a specific amount of pigment and a specific amount of dye on top of a base layer consisting of a fiber aggregate and a porous layer, and further includes forming a finishing layer containing a specific amount of pigment and a specific amount of dye. This is a method for producing brightly and deeply colored artificial leather, which is characterized by forming a finishing layer containing a specific amount of dye. Conventionally, methods for coloring artificial leather include method using dye '1', method using pigment '21,
Method '3} in which dyes and pigments are used in combination is known and is in public use.

In addition, the method of use {11] includes a coloring method by dip dyeing, as shown in Mochiko Sho 51-48403 and Mochiko Sho 50-130121, and a coloring method as shown in Tokko Sho 51-41778, for example. Coloring methods by coating and coloring methods by spraying as shown in, for example, Japanese Patent Publication No. 48-30363 are known and are in public use. Regarding {2} and {3}, various coloring methods such as intaglio printing, letterpress printing, planographic printing, and spray painting are known and in use as methods for coloring sheet materials. However, when coloring artificial leather, the method using dyes (1') has extremely light resistance compared to the results obtained from the method using pigments (2), even if any of the above-mentioned coloring methods are used. This is bad, and as a result, the commercial value of artificial leather is significantly diminished. or,
Even if one uses any of the above-mentioned coloring methods, the method using pigments yields unsatisfactory results in terms of sharpness (sharpness) when compared to the results obtained using method '1' using dyes. This also significantly reduces the commercial value of artificial leather. That is, in neither of the above cases [1) and '2], it has not been possible to produce artificial leather that has both excellent light resistance and beautiful bright hue. Therefore, in order to obtain artificial leather that has the above-mentioned excellent light resistance and bright hue, it is possible to use a glue method that uses dyes and pigments together, but this method satisfies the various characteristics required for artificial leather. was quite difficult to satisfy.

That is, even if artificial leather is colored using method 31' of using dyes and pigments together, if the combination of dyes and pigments is incorrectly used, not only will excellent light fastness and bright hue not be obtained, but it will also be difficult to obtain color at room temperature. This adversely affects various properties required for artificial leather, such as bending resistance at low temperatures and bending resistance at low temperatures. For example, as shown in Tsubaki Kaisho No. 51-41778, when coloring artificial leather, even if you first form a finishing layer containing only pigments and then form a finishing layer containing only dyes, the hue will never change. I am not satisfied with my sharpness,
Moreover, satisfactory bending resistance cannot be obtained. Therefore, as a result of intensive research to provide a method for manufacturing artificial leather that does not have the above-mentioned drawbacks, we first formed a finishing layer made of dye, pigment, and resin on the porous layer provided on the top of the base layer of artificial leather. If a method is adopted in which a finishing layer made of dye and resin is formed after applying the dye, not only the above-mentioned drawbacks can be solved, but also
We discovered that it is possible to produce artificial leather with excellent bending resistance at room temperature and low temperature, and arrived at the present invention. That is, in the present invention, on top of a base layer A consisting of a fiber aggregate impregnated with a polymer mainly composed of polyurethane elastomer and a porous grain layer of a polymer mainly composed of polyurethane elastomer, Finishing layer B containing 0.1 to 1% by weight of dye and 3 to 10% by weight of pigment, based on the resin and resin weight
Further, on top of the finishing layer B, a finishing layer C containing a resin and a dye in an amount of 0.1 to 5% by weight based on the weight of the resin is formed for 0.5 to 20 minutes. This is a method for producing artificial leather that is vividly and deeply colored, and is characterized by forming a large amount of pigment. The base layer A in the present invention refers to a composite structure made of two or more fiber structures arbitrarily selected from nonwoven fabrics, woven fabrics, or fiber composites thereof, impregnated with a polymer mainly composed of polyurethane elastomer. It consists of a fiber aggregate and a porous grain layer of a polymer mainly composed of polyurethane elastomer.

The polymer mainly composed of polyurethane elastomer herein refers to one or more polymer diols such as polyester diol, bolether diol, polyester ether diol, and polycaprolactone diol, an organic diisocyanate, and a chain extender. A polyurethane elastomer obtained by reacting a diol or diamine having two active hydrogen atoms as It is constructed by adding a attracting agent, a fatliquoring agent, a coloring agent, etc. as desired. Regarding the composition of the polyurethane elastomer, which is a polymer mainly composed of polyurethane elastomer, and the composition of substances other than the polyurethane elastomer mentioned above, when it is used for impregnation and when it is used for the porous grain layer. They may be different or may be the same. Next, regarding the finishing layer B and the finishing layer C in the present invention, resins constituting them include polyurethane, polyamide, a mixture of polyurethane and amino acid resin, polyvinyl chloride, acrylic ester resin, etc., but preferably. are polyurethane, a mixture of polyurethane and an amino acid resin, and polyamide, and more preferably polyurethane.

Between the finishing layer B and the porous grain layer, or between the finishing layer B and the finishing layer C
A finishing layer other than the finishing layer B and the upper layer C may be provided between the finishing layer B and the upper layer C or on the finishing layer C, for example, in order to give the product gloss or a smooth surface. Furthermore, additives may be added to the finishing layer B and the finishing layer C to improve light resistance, resistance to oxidative deterioration, and rust resistance. Next, regarding the pigments and dyes which are the coloring components of the finishing layer B and the finishing layer C, first of all, the pigments are preferably acid-free pigments such as carbon black, titanium white, pen powder, etc., and organic pigments.

The dyes are preferably metal-containing salt dyes, disperse dyes, and acid dyes, preferably metal-containing rust disperse dyes and disperse dyes, and more preferably alloy salt dyes. Finishing layer B
When dyes and pigments are used, one or more types of each of the dyes and pigments are usually used, but the sum of the types is preferably 3 or less in order to avoid a significant decrease in the sharpness of the hue. Similarly, it is preferable that the number of types of dyes used for the finishing layer C is 3 or less. Finishing layer B contains 0.1 to 1% by weight of dye based on the resin constituting this layer.
It is necessary to form the finishing layer B in an amount of 0.5 to 15% by weight as a solid content.

If it falls outside of these ranges, the bending resistance will be so low as to be 4.0% that it cannot be used as a product, or the color will be dull and the quality of the product will be impaired. Finishing layer B preferably contains 1 to 7% by weight of dye and 5 to 5% by weight of pigment based on the resin constituting this layer, and
The coating amount is 0.5 to 5 days/day as solid content, and the tension generated when the coating strength of the layer is stretched by 5% is 0.01 to 0.5.
It is of k9/yield 2. The finishing layer B is formed by coating with a gravure roll, coating with a knife coater, bar coater or inverse coater, coating by spraying, etc., but it is preferable to apply with a gravure roll.

Finishing layer C contains 0.1 to 5% by weight of dye based on the resin constituting this layer, and this is added to the top of finishing layer B in an amount of 0.5 to 20% by weight as a solid content. It is necessary to allow it to form. Outside these ranges, the hue will be dull and the quality of the product will be impaired. The finishing layer C is preferably
Add 10-3% of the dye to the resin constituting the finishing layer C.
This is formed as a solid content on the upper part of finishing layer B in an amount of 3 to 10 minutes per day, and the stress generated when the coating film of this layer is stretched by 5% is 0.01 to 0. .5k9/
This is from side 2.

It is possible to perform embossing and kneading treatments on artificial leather colored in this way.

Finishing layer C, like finishing layer B, can be formed by coating with a gravure roll, coating with a knife coater, reverse coater, inverse coater, coating by spraying, etc., but it is preferable to apply with a gravure roll. As in the present invention, a finishing layer containing a specific amount of pigment and a specific amount of dye is formed on a base layer consisting of a fiber aggregate and a porous iron surface layer, and further a specific amount of dye is applied thereon. By forming a finishing layer containing the compound, artificial leather can be obtained which has excellent light resistance and bending resistance, and has a beautiful clear hue.

Next, the present invention will be explained by examples.

Example 1 A polyurethane resin is impregnated in a solid content of 55% of the weight of the nonwoven fabric into a nonwoven fabric layer of a polyester fiber nonwoven fabric, and a polyurethane resin of the same composition is added on top of the composition at a solid content of 250 m/s. A substrate layer was prepared by coating the substrate with a porous silver surface layer.

On top of this, paint b shown in Table 1 was applied 2 evenings/day with a gravure roll, and then paint c shown in Table 1 was applied 6 nights/day with a gravure roll, and then alicyclic isocyanate and polyester diol were applied on top of this. Three coats of key yellowing type polyurethane paint made from amino chain extender and amino chain extender were applied, and then pore-like embossing was performed. The thus obtained artificial leather had a clear hue and a great depth of color, and also had high bending resistance due to ballyflex.

Table 1 However, the amounts for each component are shown in parts by weight of the pure coloring material for pigments and dyes, parts by weight of the solid content for resins, and parts by weight for solvents.

Comparative Example 1 On the base layer obtained in Example 1, a paint was prepared by removing the dye component from paint b in Table 1 and was applied instead of paint b in Example 1.

Furthermore, the same treatment as in Example 1 was performed thereon. The thus obtained artificial leather had similar bending resistance due to Ballyflex compared to the results of Example 1, but the hue lacked sharpness and the color depth was low.

Comparative Example 2 On the substrate layer obtained in Example 1, paint b'' of Table 1 was applied instead of paint b of Example 1.

Furthermore, the same treatment as in Example 1 was performed thereon.
The thus obtained artificial leather has significantly lower bending resistance due to Ballyflex when compared to the results of Example 1, and is also similar to Comparative Example 1 in terms of sharpness of hue and depth of color. The results were poorer than those of Example 1.

Comparative Example 3 On the base layer obtained in Example 1, paint b in Table 1 was applied to the same machine as in Example 1, and on top of that, paint c in Table 1 was applied.
'' was applied instead of the paint c of Example 1.

Furthermore, the same treatment as in Example 1 was performed thereon.
The thus obtained artificial leather has significantly lower bending resistance due to Ballyflex when compared to the results of Example 1, and is similar to Comparative Example 2 in terms of hue clarity and color depth. The result was worse than the result of 1.

Comparative Example 4 On the base layer obtained in Example 1, paint c in Table 1 was coated with a gravure roll for 2 coats, and then paint b in Table 1 was coated on top of it with a gravure roll for 6 coats. Coated.

Claims (1)

[Claims] 1. Base layer A consisting of a fiber aggregate impregnated with a polymer mainly composed of polyurethane elastomer and a porous grain layer of a polymer mainly composed of polyurethane elastomer.
Add 0.1-10% of the dye to the resin and resin weight on top of the resin.
% by weight, and a finishing layer B containing 3 to 100% by weight of pigment.
is formed in an amount of 0.5 to 15 g/m^2 as a solid content, and a finishing layer C containing 0.1 to 50% by weight of a dye based on the resin and resin weight is formed on top of the finishing layer B as a solid. A method for producing brightly and darkly colored artificial leather, characterized by forming the artificial leather in an amount of 0.5 to 20 g/m^2 per minute.