JPH05230772A - Production of artificial leather having stone wash-tone surface change - Google Patents

Abstract

PURPOSE:To provide knit fabric comprising fibrillated conjugate yarn of polyamide and polyester with surface change of characteristic stone wash tone, special luster and proper stretch packing properties. CONSTITUTION:Knit fabric having a pattern, composed of fibrillated conjugate yarn comprising polyamide and polyester, is opened, fibrillated, impregnated with polyurethane, embossed and tumbled under dry heat at 50-120 deg.C to give artificial leather having stone wash-tone surface change.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a pseudo leather having a stone-wash-like surface change from a knitted fabric composed of fibrillated composite fibers composed of polyamide and polyester.

[0002]

2. Description of the Related Art Conventionally, in order to impart a surface change such as wrinkles to the surface of a fabric, a method for obtaining wrinkles by using mechanical pressure,
A method of obtaining wrinkles by heat is known. Further, as a method for obtaining gloss on the surface of the cloth, a calendar method is known.

However, in the method for obtaining wrinkles by using mechanical pressure or the method for obtaining wrinkles by heat, the strength of the wrinkles obtained is only constant, and the gloss obtained by the calender method is plain. There was a drawback that the change was scarce and only a monotonous surface change was obtained.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and produces a pseudo leather having a unique stone-wash-like surface change on the surface of a knitted fabric and a unique luster. It provides a method.

[0005]

Means for Solving the Problems The inventors of the present invention have earnestly studied to solve the above problems, and as a result, have made a knitted fabric having a patterned pattern at a high density by using a fibrillated composite fiber composed of polyamide and polyester. After knitting, open fiber fibrillation, followed by impregnation with polyurethane, embossing, and tumbler treatment under dry heat of 50 to 120 ° C. The present invention comprising a method for manufacturing leather has been completed.

The fibrillated composite fiber of polyamide and polyester referred to in the method of the present invention means that polyamide and polyester have a shape in which one component does not completely surround the other in the cross section of a single filament. It refers to a composite fiber that is joined along the longitudinal direction of the filament.

Here, as the polyamide, for example, nylon 4, nylon 6, nylon 7, nylon 11, nylon 12, nylon 66, nylon 6,10, polymetaxylene adipamide, polyparaxylylene decanamide, polybiscyclohexyl are used. Examples include methanedecanamide and copolyamides containing them.

As the polyester, for example, polyethylene terephthalate, polytetramethylene terephthalate, polyethylene oxybenzoate, poly 1,4
-Dimethylcyclohexane terephthalate, polypivalolactone and copolyesters containing these as components.

The ratio of both polyamide / polyester components is usually in the range of 0.05 to 0.95.

The knitted fabric having a patterned pattern preferably means a knitted fabric having a satin pattern.

The term "open fiber fibrillation" as used herein means that the fibrillated composite fiber is divided into joints of the respective components to form a fibril composed of a segment yarn of one component and a segment yarn of the other component. Specifically, a cloth made of fibrillated composite fibers made of polyamide and polyester is treated with an agent for swelling polyamide for polyamide swelling treatment (hereinafter referred to as fibrillating agent) to separate the segments. To do. At this time, the cloth shrinks at the same time. In the present invention, it is preferable to perform a high shrinkage, for example, 40 to 60% in area ratio.

Specific examples of the fibrillating agent include benzyl alcohol, β-phenylethyl alcohol, phenol, m-cresol, formic acid, acetic acid and the like. Further, it is suitable to use it as an aqueous solution or an aqueous emulsion thereof. Among them, the method of using an aqueous emulsion of benzyl alcohol is most suitable for the method of the present invention in terms of the shrinkability and fibrillation effect of the woven fabric, and the relatively easy handling.

In order to prepare an aqueous emulsion of the above-mentioned fibrillating agent, a surfactant may be added to the fibrillating agent and emulsified and dispersed. As the surfactant, a nonionic surfactant, a cationic surfactant, Any of an anionic activator, an amphoteric activator or a mixed type thereof may be used.

The concentration of the fibrillating agent must be 1.5% by weight or more in order to obtain a sufficient shrinkage and fibrillation effect, and if it exceeds 50% by weight, it becomes unstable in the case of an aqueous emulsion. It is very difficult to remove the fibrillating agent. Further, if it exceeds 50% by weight, components other than the polyamide component may be affected. From this viewpoint, the concentration is preferably 3 to 30% by weight.

In the method of the present invention, it is preferable that the non-treated product is left in the treatment liquid containing the fibrillating agent as described above, or is squeezed by mangle after immersion.

The temperature of the treatment liquid is 5 to 80 ° C., especially 10
The temperature is preferably -50 ° C, and when dipping and squeezing, the amount of the fibrillating agent held by the cloth is preferably 1 to 50% by weight (based on the weight of the cloth).

For the impregnation of polyurethane, a solution or emulsion containing polyurethane is applied to the knitted fabric by a method such as padding or spraying for impregnation. The applied amount of polyurethane is 5 to 15% by weight based on the weight of the knitted fabric. Polyurethane is coagulated using either a dry coagulation method (temperature 120 to 150 ° C., time 3 minutes) in which a solvent is directly evaporated or a wet coagulation method (temperature 20 to 60 ° C.) in which it is immersed in a coagulating liquid to coagulate. However, the dry method is preferable.

The embossing preferably has a pressure of 20 to
It is carried out under the conditions of 50 kg / cm and a temperature of 130 to 180 ° C., and a satin pattern pattern is transferred to the knitted fabric after fibrillation. Here, the embossing is a method of physically imparting a three-dimensional pattern to the cloth, and by passing the cloth through an embossing roll in which a metal roll engraved with an uneven pattern on the heated surface and a soft roll are combined. It refers to a method of imparting a three-dimensional pattern to a cloth.

The tumbler treatment is carried out using dry hot air at 80 to 100 ° C. for about 5 to 10 minutes. The tumbler treatment is performed here in order to form a large wrinkle by rubbing with the tumbler and to impart a unique surface change. Further, the impregnation of the polyurethane is essential in the tumbler treatment, and if it is not impregnated with the polyurethane, the knitted fabric itself has no so-called stiffness, and wrinkles formed on the surface of the knitted fabric become too deep, which is inconvenient.

Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples.

[0021]

[Example] A fibrillated composite fiber composed of polyamide and polyester (50 denier / 25 filaments)
/ Twist number 2100) was used to knit a knitted fabric with a satin finish. The stitch density of the knitted fabric was W (well) = 50 and C (course) = 60.

The satin-finished knitted fabric was benzyl alcohol 1
After immersing in an 8% aqueous emulsion (using an emulsifier: Nichika Kagaku Sanmor BK20Conc. 1.8%), the solution was squeezed with a mangle, wound, and left to stand for 10 minutes while idling.

After the opening was completed in this manner, hot water washing or water washing was performed in order to remove benzyl alcohol. Shrinkage (area ratio) was 60% (ie 1m
² shrinks to 0.4 m ^2. )

Subsequently, a 15% aqueous solution of polyurethane (trademark Superflex E-4000) was padded with a pickup of 80%, and then heat-treated at a temperature of 120 ° C. for 3 minutes.

Thereafter, the pressure is 29 kg / cm and the temperature is 160.
Embossing was performed at ℃ and the satin pattern was transferred.

Next, while supplying dry hot air of 95 ° C., 10
A tumbler treatment was performed for a minute.

As a result, a pseudo leather having a unique stone-wash-like surface change and a unique luster, and having an appropriate stretch back property was produced.

[0028]

INDUSTRIAL APPLICABILITY As described above, by using the method of the present invention, a knitted fabric composed of polyamide and polyester fibrillated composite fibers has a unique stone-wash-like surface change, a unique luster, and an appropriate stretch back. It can be made into artificial leather by giving it sex.

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Claims (1)

[Claims] 1. A knitted fabric having a patterned pattern is knitted at high density using a fibrillated type composite fiber composed of polyamide and polyester, and is then opened to form fibrils, followed by impregnation with polyurethane and embossing. ~ 120 ° C
A method for producing a pseudo leather having a stone-wash-like surface change, which is characterized by performing tumbler treatment under dry heat.