JPH0258983B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for finishing the surface of a sheet-like article, particularly a leather-like sheet-like article, into a surface that emphasizes a unique color and a three-dimensional effect.

[Conventional technology]

Conventionally, as a method for applying a colored layer to the surface of a sheet-like object, for example, a leather-like sheet, a composition liquid containing a coloring agent is applied to the surface of the sheet-like object by a spray method or a gravure printing method. It's here. Furthermore, as a method for giving the surface of a leather-like sheet a good colored surface, Japanese Patent Laid-Open No. 55-22071
The publications include Japanese Patent Publication No. 18424-18424 and Japanese Patent Publication No. 1848, in which a colorant composition liquid is applied in dots by a spray method.
In Japanese Patent Publication No. 59-33715 and Japanese Patent Application Laid-open No. 59-228088, a pattern is applied to the surface of the surface to dye it with an easily dyeable polymer. We proposed methods such as finishing by applying a polymer solution or dispersion to the surface.

[Problems to be solved by the invention] In addition to the conventional three-dimensional effect due to unevenness on the surface of a sheet-like object, in order to create a three-dimensional effect by adding a color difference or a different color, it is necessary to simply combine conventional surface finishing methods. Therefore, it is not possible to obtain a good finished surface. In particular, if you want to emphasize a unique color, it is necessary to perform multicolor printing using a gravure printing method using an engraved roll. There may be cases where it is not possible to do so. Furthermore, the gravure printing method produces uniform patterns and cannot impart natural variations.

The present invention provides a surface finish that has a three-dimensional effect due to unevenness that cannot be achieved with conventional surface finishing methods, has a three-dimensional effect with a sense of color difference or a different color, and also has visual flexibility and a sense of solidity. It is in.

[Means for solving problems]

The present invention provides a method for applying a polymer mainly composed of an elastic polymer to the surface of the polymer when coloring and finishing a porous or non-porous sheet material, at least the surface of which is made of a porous or non-porous polymer mainly composed of an elastic polymer. After forming an undercoat layer and embossing a concavo-convex pattern on the surface, a polymer mainly composed of an easily dyeable polymer or an elastic polymer containing an easily dyeable polymer is applied to the convex portions, and an overcoat is applied. This is a surface finishing method in which a layer is formed, then dyed and finished to create a leather-like sheet-like product with an emphasized three-dimensional effect with a unique color on the surface.

That is, the present invention provides a porous coating layer or a non-porous coating layer of a polymer mainly composed of an elastic polymer on one side of a fiber aggregate or a fiber aggregate containing a polymer mainly composed of an elastic polymer. The surface of the substrate is a sheet-like material made of a polymer mainly composed of an elastic polymer, such as a sheet-like material made of a single porous layer of a polymer mainly composed of an elastic polymer. A solution or dispersion of a polymer mainly composed of an elastic polymer applied directly to the surface of an object, which is coated with a polymer mainly composed of an elastic polymer containing or not containing a colorant, or directly onto the surface of a base sheet-like object. is applied by a method such as a gravure method, a spray method, or a knife coating method, and is dried to form a non-porous undercoat layer. The coating amount is 0.5 to 50 g/m ² in terms of solid content, preferably 1 to 40 g/m ² . If the amount applied is too large, the texture, creases, etc. will deteriorate. Note that a desired coloring agent may be added to the undercoat polymer. For example, if the color is similar to the convex part, a light color is added, and if the color is different from the convex part, a slightly darker color is added, but both are determined in relation to the color tone of the convex part. The elastic polymer for undercoating is preferably a polyurethane elastomer, but polyacrylic esters or acrylic ester copolymers may also be used alone or in combination with polyurethane elastomers.

After forming an undercoat layer on the surface of the sheet-like material, a desired uneven pattern is embossed. The uneven pattern can be created by using a metal roll, metal plate, or metal belt engraved with a surface pattern of leather, an arbitrary pattern, or a geometric pattern, and a heat embossing method, which is usually used for patterning leather-like sheet materials, can be applied. The depth of the unevenness formed by embossing is 30 μm or more, preferably 50 μm or more, in order to form a polymer overcoat layer on the convex portions. Depth is 30μm
If it is less than this, it will be difficult to apply the polymer only to the convex portions, and it will not be possible to impart or emphasize a three-dimensional effect or a different color.

Next, for the sheet-like material having the uneven pattern on the surface, a polymer mainly composed of an easily dyed polymer or an elastic polymer containing an easily dyed polymer is applied to the convex portions of the surface to form an overcoat layer.

The easily dyeable polymer used in the present invention may be easily dyed with the desired dye. For example, when using a metal complex dye, the easily dyeable polymer may be a polyurethane elastomer having a polyethylene oxide chain in the soft segment, polyvinylpyrrolidone, etc. , N-methoxymethylated nylon, etc. are used. Further, as disperse dyes, polyurethane elastomers, polycarbonate-based polyurethane elastomers, polyester elastomers, etc., which contain many tertiary nitrogen atoms in the molecule, are used. Elastic polymers used in combination with easily dyeable polymers include, for example, polyurethane elastomers, polyacrylic esters, and acrylic ester copolymers using polyester, polyether, or lactone ring-opening polymerized polylactone in the soft segment. It will be done. Further, a coloring agent may be added to the top coating polymer. The amount of coating of this easily dyeable polymer or a polymer mainly composed of an elastic polymer containing an easily dyed polymer on the convex portions of the surface is 0.5 to 15 g/m ² in terms of solid content, preferably 1 to 10 g/m 2 .
It is the amount of ^m2 . Further, as a method for applying the polymer composition liquid, it is preferable to use a gravure roll having notches. In addition, the easily dyeable polymer has an equilibrium dyeing amount of at least 30 mg/
g, preferably 50 mg/g, and when dyed under the same conditions as the constituent materials of the sheet-like article, the dye adsorption amount D ₁ and dyeability of the constituent materials of the sheet-like article, especially the constituent materials of the undercoat layer. It is preferable that the relationship with the dye adsorption amount D ₂ of the polymer satisfies 3D ₁ ≦D ₂ in order to impart a unique color feeling.

After forming an overcoat layer on the convex parts of the surface, it is dyed and finished. The dyeing method and dyeing conditions are selected according to the shape of the sheet-like article, the constituent materials, and the type of dye used, according to the methods and conditions normally practiced. For example, dyeing is carried out by normal pressure dyeing or high pressure dyeing using a Jitzger dyeing machine, a Wins dyeing machine, a circular dyeing machine, etc. Further, the type of dye and dye concentration are determined depending on the constituent materials and the desired color tone. By soaping and drying the dyed sheet material, the concave and convex portions of the surface can have different tones, colors, or shades of color.

The surface-colored sheet material of the present invention is further coated on a heating roll or heating belt surface having a metal surface with a mirror finish or a metal surface with a fine uneven surface finish in a satin pattern. A method of bringing convexities on the surface of objects into contact, smoothing out the tops of the convexities a little, and adding gloss or reducing the gloss. Alternatively, it is also preferable to add a method of applying a gloss-adjusting polymer composition liquid to the tops of the surface convex portions to adjust the gloss and finish.

〔Example〕

Next, embodiments of the present invention will be explained with examples.
Note that parts and percentages in the examples are by weight unless otherwise specified.

Example 1 An entangled nonwoven fabric of nylon-6 ultrafine fiber bundle fibers,
One side of a 1.0 mm thick fibrous sheet with a smooth surface containing a porous structure of polyester polyurethane obtained by reacting polyethylene adipate glycol, 4,4'-diphenylmethane diisocyanate, and ethylene glycol. A beige polyether polyurethane aqueous dispersion (solid content concentration 15%) containing 1% brown pigment added to the polyurethane was applied in an amount of 10 g/m ² in terms of solid content using a roll coating method, Using the dried substrate, a polyurethane elastomer obtained by reacting 1,6-hexanediol polycarbonate glycol, isophorone diisocyanate, and isophorone diamine/hydrazine (equilibrium dyeing amount with respect to metal complex dye 85 mg/g) is applied to the surface of the substrate using isopropyl. A 10% polyurethane elastomer solution was dissolved in a mixed solvent composition of alcohol/cellosolve/toluene, and a polyurethane amount of 3 g/m ² was applied using a gravure roll method to form an undercoat layer.

Next, using an embossing roll with a leather drawing pattern (average depth of recesses 150 μm) on the surface on which the undercoat layer was formed,
Roll temperature 170℃, cylinder air pressure 10Kg/cm ²
Heat stamping was performed under these conditions to give the surface a textured pattern (average depth of depressions: 90 μm). The easily dyeable polymers applied to the convex parts of this uneven pattern include polyethylene oxide glycol/1.6-hexanediol polycarbonate glycol, isophorone diisocyanate, and isophorone diamine/
Polyurethane elastomer obtained by reacting hydrazine (equilibrium dyeing amount with respect to metal complex dye: 295 mg/
Dissolve g) in a mixed solution composition of isopropyl alcohol/cellosolve/toluene, use a 6% solution of polyurethane elastomer, and apply this polyurethane elastomer solution to the convex portions of the surface using a gravure roll with 150 meshes in an amount of 2 to 30% polyurethane.
g/m ² and dried to form an overcoat layer.

The surface-treated sheet material was dyed using a wince dyeing machine with 5% owf of brown metal complex dye Irugalan Brown (manufactured by Ciba Geigy) and 2 g of the auxiliary agent Levelan NK-D (manufactured by Marubishi Yuka Co., Ltd.). /, bath ratio 1:
50, dyed at a temperature of 90°C and for a dyeing time of 60 minutes, and then dried by soaping with warm water. When the obtained sheet-like material was softened, the concave portions of the surface unevenness pattern were light brown, and the convex portions were dark brown, giving a visual three-dimensional effect and a different color due to similar colors.

In addition, the convex parts of the surface of the dyed sheet were brought into contact with a mirror-finished heating calender surface to flatten the heads of the convex parts a little and give them a gloss, and then the finished product was treated with a softener and rubbed. . The obtained sheet-like material has a subdued color tone similar to the leather drawing pattern of natural leather, has an enhanced visual three-dimensional effect, and has a solid feeling, and is suitable as a raw material for bags or shoes. It was suitable.

For comparison, a sheet-like product finished without forming an overcoat layer had no visual three-dimensional effect or heavy feeling, and was also light in color.

Example 2 A sheet-like material having a polyurethane elastomer porous layer with a thickness of 0.25 mm formed on one side of a nylon woven fabric was used as a base, and the equilibrium dyeing amount of metal complex dye was 64 mg/g on the surface of the polyurethane elastomer porous layer.
10% dye-resistant polyester polyurethane elastomer, 2% yellow pigment, 50% dimethylformamide
%, acetone 37%, and cyclohexanone 31% in an amount of about 3 g/m ² in terms of solid content, and after drying, using an Alpine pattern flat plate press (average depth of recesses 300 μm), temperature was applied. 120℃,
Embossing was carried out under the conditions of a press pressure of 3 Kg/cm ² and a time of 10 seconds.

Next, the dyeing amount for metal complex dye was 315mg/
g of N-methoxymethylated nylon 8%, methanol 80%, NN'-dimethylformamide 10%,
An easily dyeable polymer composition liquid consisting of 2% yellow-orange organic pigment is applied to the convex surface of the sheet using a gravure roll with 150 meshes at a solid content of 2.5%.
g/m ² , and after drying, use a circular dyeing machine to apply a yellow metal complex dye composition of 1.5%.
owf, dyed at a temperature of 90℃, soaped and dried.

The obtained sheet-like material had a clear pale yellow color in the concave portions, a deep orange-yellow color in the convex portions, and a gradual change in color tone at the boundary between the two.
The protrusions on the surface of this sheet-like material were pressed against the surface of a heated metal plate with a satin matte finish, the heads of the protrusions were slightly flattened, and the surface was softened to make the surface a little less glossy. The sheet-like product had a finished surface with a visually solid feel.

〔Effect of the invention〕

The sheet-like material obtained by the surface finishing method of the present invention is
In addition to the uneven pattern created by embossing, it is possible to create a difference in color tone between the concave and convex areas, resulting in a surface finish that emphasizes a unique color and three-dimensional effect.
A visually profound feeling can be easily imparted.

Claims (1)

[Scope of Claims] 1. When coloring and finishing a sheet-like material in which at least the surface of the substrate is made of a porous or non-porous polymer mainly composed of an elastic polymer, a polymer mainly composed of an elastic polymer is applied to the surface of the polymer. After applying a combination to form an undercoat layer and stamping an uneven pattern on the surface, a polymer mainly composed of an easily dyeable polymer or an elastic polymer containing an easily dyeable polymer is applied to the convex portions. A surface finishing method for sheet-like materials, which is characterized by forming a topcoat layer, then dyeing and finishing. 2 When dyed under the same dyeing conditions, the relationship between the dye adsorption amount D ₁ of the polymer forming the undercoat layer and the dye adsorption amount D ₂ of the easily dyeable polymer forming the top coat layer is 3D ₁
≦D ₂ and the equilibrium dyeing amount of the easily dyeable polymer is at least 30 mg/g.
Surface finishing method for sheet-like products described in Section 1. 3. A method for finishing the surface of a sheet-like article according to claim 1 or 2, wherein the undercoat layer is a polymer containing a colorant. 4. Surface finish of the sheet-like article according to any one of claims 1 to 3, wherein the top coat layer is an easily dyeable polymer containing a coloring agent or a polymer mainly composed of an easily dyeable polymer containing a coloring agent. Law. 5. A method for finishing the surface of a sheet-like article according to any one of claims 1 to 4, in which the surface convex portions are brought into contact with a heated smooth metal surface to flatten the heads of the convex portions. 6. A method for finishing the surface of a sheet-like article according to any one of claims 1 to 4, wherein the finishing is performed by applying a gloss-adjusting polymer composition liquid to the surface to adjust the gloss.