JP2000303365A - Suede-like artificial leather with stretchability and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a suede-like artificial leather excellent in elongation ratios and elongation recoveries in vertical and horizontal directions and having stretchability by carrying out hot water treatment and dry heat treatment of a nonwoven fabric structure comprising an ultrafine fiber and then subjecting the treated nonwoven fabric structure to dyeing treatment. SOLUTION: A nonwoven fabric comprising polyethylene terephthalate having at least 1 denier single yarn is subjected to hot water treatment at >=80 deg.C by a jet dyeing machine and dry heat treatment at a temperature >=+30 deg.C higher than dyeing temperature, e.g. 160-180 deg.C in the range of 0-10% over feed ratio by a pin type tenter and then subjected to dyeing treatment at 120 deg.C to provide the objective suede-like artificial leather having >=5%, preferably >=10% elongation ratios and >=80% elongation recoveries in vertical and horizontal directions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suede-like artificial leather having excellent stretchability and a method for producing the same.

[0002]

2. Description of the Related Art A conventional suede-like artificial leather made of a nonwoven fabric has no stretch property, and particularly has little stretch property in the vertical direction. The cause is that processing must be performed while constantly extending in the vertical direction in the manufacturing process. Furthermore, in the final finishing step, it was impossible to increase the elongation in the vertical direction, and even if the elongation was forcibly increased, there was no recovery from the elongation and lacked durability such as washing.

[0003] By providing the stretch property, the elasticity of the product is improved, wrinkles are hardly formed, and it is easy to mold for furniture, shoes and the like. It was a required characteristic.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a suede-like artificial leather having a stretch property, in particular, a vertical stretch property, without deteriorating the surface quality of the suede-like artificial leather.

It is another object to provide a durable stretch property.

[0006]

As a means for solving the above-mentioned problems, the present invention relates to a suede-like artificial leather comprising a nonwoven fabric structure formed of at least 1 denier or less fiber, and has a vertical and horizontal direction. The elongation rate is 5% or more, and the elongation recovery rate is 80% or more.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The subject of the present invention has been intensively studied and solved as a result of performing a novel heat treatment before dyeing. Leather was obtained.

[0008] The artificial leather of the present invention has an elongation in the vertical and horizontal directions of 5% or more, preferably 10% or more, and
The stretch recovery rate is 80% or more.

That is, before dyeing, first, the fabric is contracted in the vertical direction and stretched in the horizontal direction by hot water treatment, thereby relaxing the strain generated in the production of the nonwoven fabric structure before dyeing.
In this state, the product of the present invention was obtained by fixing the shape by dry heat treatment while further contracting in the vertical direction. In order to cause shrinkage in the vertical direction, a two-stage method of hot water treatment and dry heat treatment is effective, and is preferable from the viewpoint of processing wrinkles. By performing heat treatment before dyeing, durability can be obtained. That is, since the dyeing is performed at a high temperature after the form is fixed by the heat treatment, the final product has excellent washing durability.

[0010] The nonwoven fabric structure of the present invention is a polymer material such as polyurethane formed on a base material mainly composed of a fiber layer entangled in a random three-dimensional structure using at least short fibers of 1 denier or less. Is impregnated. Further, the surface of the nonwoven fabric is raised to form a dense raised hair on the surface, and the colored nonwoven fabric is suede-like artificial leather. 5% by weight to give a feeling of volume and elasticity
It is preferable to contain the above-mentioned polymer materials such as polyurethane.

The nonwoven fabric structure is subjected to a heat treatment before dyeing. The heat treatment method is described in further detail.

First, at least a temperature of at least 80 ° C. for the hot water treatment is an essential condition of the present invention. The purpose is to shrink the paper vertically and expand it horizontally, to evenly control the nap on the surface of the greige machine, and to form the nap longer.

As a hot water treatment method, a liquid dyeing machine such as a circular dyeing machine is more effective in reducing shrinkage and nap formation.

Next, a dry heat treatment is performed after or without drying.

The effect of the present invention is great when the drying heat temperature is not less than the dyeing temperature + 30 ° C. When the drying heat temperature is low, the heat setting property is poor, the heat setting property is reduced by dyeing, and the stretch property is not obtained. When the fiber is polyethylene terephthalate, the dyeing temperature is 120 ° C, and the dry heat treatment temperature is 160 to
180 ° C. is preferred. Furthermore, as the contraction and fixation in the vertical direction, an OF rate (overfeed rate) of 5% or more is good.
The width direction is preferably 0% to 10% with respect to the width after the hot water treatment.

As the dry heat treatment apparatus, a pin type tenter,
A non-touch dryer can be used.

[0017]

The present invention will be described below in detail with reference to examples. The evaluation in the present invention was performed by the following method. <Nap length> The length was evaluated by visual judgment. <Napping Judgment> In the case where the napping was uniformly judged by the naked eye judgment, a slightly focused state was judged as x. <Elongation ratio> Samples of 5 cm × about 30 cm were taken in the vertical and horizontal directions, and three samples were taken. Using a low-speed extension type tensile tester, a gripping distance of 20 cm was applied while applying a load equivalent to the weight of the sample. The film is stretched to 1.8 kg at a speed of 20 cm / min, the gripping interval at that time is measured, and the elongation ratio is determined by the following formula, and the average value of three pieces is expressed.

Elongation rate (%) = (L1−L) / L × 100 L1: gripping distance (mm) when extended to 1.8 kg L: gripping distance (mm) <Elongation recovery rate> 5 cm × about 30 cm Vertical sample,
And three samples are taken in the horizontal direction, and using a low-speed extension-type tensile tester, a grip interval of 20 cm with a load equivalent to the weight of the sample is applied. Next, the film is stretched to 80% of the obtained stretching ratio and left for 1 minute, returned to the original position at the same pulling speed of 20 cm / minute, and left for 3 minutes. After repeating this operation five times, the sample is stretched to a load equivalent to the weight of the sample. Then, the residual elongation is determined from the load-elongation curve of the recorded chart.

Elongation recovery rate (%) = (L2-L3) L2 × 100 L2: Length on the chart (mm) corresponding to 80% elongation of the elongation rate L3: Equivalent to residual elongation after 5 times of repeated elongation Length on the chart to be performed (mm) Example The surface of a nonwoven fabric structure composed of 80% by weight of polyethylene terephthalate fiber having a single fiber fineness of 0.13 denier and 20% by weight of a polyurethane resin is subjected to buffing with sandpaper to obtain a surface. To obtain a nonwoven fabric structure having nap. Next, hot water treatment and dry heat treatment were performed under the following conditions, and dyed. Thereafter, a softening agent and an antistatic agent were applied, and drying / width alignment was performed to obtain a suede-like artificial leather. <Heat treatment conditions> Treatment machine: Circular dyeing machine (manufactured by HISAKA SEISAKUSHO) Treatment temperature, treatment time: 90 ° C, 30 minutes Cloth speed: 120m / min (1 cycle 2 minutes) <Dry heat treatment condition> Treatment machine: Pin type tenter Processing temperature, processing time: 180 ° C, 3 minutes Equipment width: 130 cm OF (overfeed) rate: 8% <Dyeing> Dyeing machine: Circular dyeing machine (manufactured by Hisaka Seisakusho) Dyeing temperature, time: 120 ° C, 45 minutes use Dye, Dyeing color: Disperse dye, Brown <Drying / Width alignment> Processing machine: Pin type tenter Processing temperature, processing time: 120 ° C., 3 minutes Equipment width: 130 cm Comparative example Polyethylene terephthalate fiber having a single yarn fineness of 0.13 denier A nonwoven structure composed of 80% by weight and 20% by weight of a polyurethane resin is buffed with sandpaper to form a nonwoven structure having napped surfaces. To obtain things. Thereafter, dyeing was performed under the dyeing conditions shown in the examples without hot water treatment or dry heat treatment. Thereafter, a softener and an antistatic agent were applied, and drying / width alignment was performed.

The artificial suede-like leather of the present invention has stretch properties and excellent durability.

Table 1 shows the results of the evaluation of the above-described Examples and Comparative Examples.

[0022]

[Table 1]

[0023]

According to the present invention, it is possible to provide a suede-like artificial leather having a stretch property, particularly a vertical stretch property, without deteriorating the surface quality of the suede-like artificial leather, and to provide an artificial leather having a durable stretch property. it can.

Claims (3)

[Claims] 1. A suede-like artificial leather comprising a nonwoven fabric formed of fibers having at least 1 denier per single yarn or less, having an elongation rate of 5% or more in the vertical and horizontal directions and an elongation recovery rate of 80% or more. Suede-like artificial leather characterized by the following. 2. A non-woven fabric formed of at least 1 denier or less fiber is subjected to hot water treatment at 80 ° C. or more by a liquid dyeing machine, followed by dry heat treatment, and then dyed. The method for producing a suede-like artificial leather according to claim 1. 3. The method for producing artificial suede-like leather according to claim 2, wherein the temperature of the dry heat treatment is not lower than the dyeing temperature + 30 ° C.