JPS59192779A - Production of sheet-like article excellent in dimensional stability - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a sheet-like product with excellent dimensional stability.More specifically, when sewing a sheet-like product into a product,
The present invention relates to a method for producing a sheet-like article with excellent dimensional stability that does not cause excessive shrinkage during dry heat or wet heat treatment.

Conventionally, it is widely known to impregnate a polyurethane elastomer into a base fabric mainly made of ultrafine fibers and to raise the ultrafine fibers to obtain artificial leather-like products.The quality of such artificial leather-like products is Although any design can be made depending on the combination of the base fabric and the polyurethane elastic material used, the present inventors have developed a method for obtaining an artificial leather-like material that has both graceful surface quality and firm and flexible texture. 61766, 0.5 as a base fabric.
A method has already been provided in which a fiber sheet made of a combination of ultrafine fibers of denier or less and knitted fabrics is impregnated with an elastic material such as a polyurethane elastic material.

The feature of this method is that it uses knitted fabrics that are intertwined and integrated with ultrafine fibers as a component of the base fabric, so it can be used for clothing, shoes, etc.
The strength and elongation required for bags, gloves, and other uses can be imparted relatively easily through the design of knitted fabrics, and ultrafine fibers can be used as constituent elements to express graceful surface quality. Polyurethane elastic bodies have the great advantage that they can be designed independently, primarily as constituent elements that provide a soft hand that is comfortable to hold.

Therefore, the type and amount of polyurethane elastic material can be selected without any special restrictions depending on the purpose, but the inventor has found that conventional artificial leather-like materials have a superior texture compared to high-grade wool fabrics used for suits, etc. However, we focused on the fact that we could only obtain a hardness that was rubber-like and covered, and as a result of our efforts to improve this, we developed polytetramethylene glycol, organic diine thiol 1-. Only by using a polyurethane elastomer made of a glycol chain extender did it become possible to obtain an extremely soft texture.

However, sheet materials obtained by impregnating a base fabric made of ultrafine fibers of 0.5 denier or less and knitted fabrics with a polyurethane elastomer made of polytetramethylene glycol, organic diincyanate, and a glycol chain extender have not been used industrially. It was discovered that there were some unexpected problems when trying to produce this product. In other words, when processing such a sheet-like material into a suede-like artificial leather-like material, post-processing processes such as dyeing, brushing, antistatic, water repellent, and antifouling are required, but this is not possible industrially. are often processed with long items (excessive tension is inevitably applied in the warp direction, and as a result, when the resulting sheet-like item is sewn into coated leather, etc., it shrinks significantly due to the heat of steam or ironing). However, it was found that fatal defects such as puckering, which is so uneven that it does not form a shape as a garment, occur.

As a result of further investigation into the improvement of the above-mentioned sheet-like material made of the specified base fabric and polyurethane elastic material, which have excellent surface quality, texture, and physical properties, the present inventor finally found the present invention. This invention has been achieved.

That is, the present invention provides a base fabric made of a combination of a nonwoven fabric made of ultrafine fibers of 0.5 denier or less and a knitted fabric, and polytetramethylene glycol, organic diincyanate,
A sheet-form with excellent dimensional stability, characterized in that, when finishing the sheet-form obtained by impregnating a polyurethane elastomer made of a glycol chain extender, relaxation heat treatment is performed at a temperature equal to or higher than the softening point of the polyurethane elastomer. It's in the way things are manufactured.

The manufacturing method of the present invention will be explained in detail below.

The material and fiber length of the ultrafine fibers used for the base fabric can be selected arbitrarily, but the fineness should be 0.5 to obtain the dense surface quality and lighting effect of suede-like or bag-like sheets. It is necessary that the value is less than or equal to 100%. Preferred examples of the material include polyester, polyamide, polyacrylonitrile, cellulose, and guplar cellulose. The fiber length can be selected depending on the purpose, such as short fibers cut into 1 to 50 fibers, 1 oons or more, or substantially long fibers.

2) As a method for producing such ultrafine fibers, known seabird fiber method, mixed fiber method, direct spinning method, melt blow method, spunbond method, etc. can be used.

As knitted fabrics, knitted fabrics such as Korean knits and triconte fabrics, fabrics with textures such as plain weave, twill weave, satin weave, and patterned fabrics are preferably used.As the constituent raw yarns of knitted fabrics, straight yarns and temporary yarns are preferably used. Twisted yarn is preferred.

Extra-fine W1. In order to obtain a base fabric consisting of fibers and knitted fabrics, for example, a non-woven fabric is formed by a random web yarn or paper making method, and the knitted fabrics are laminated by inserting the knitted fabrics in the middle, and needle bunching is performed. It can be obtained by intertwining and integrating ultrafine fibers and ultrafine yarns with knitted fabrics using high-pressure columnar water flow or the like.

The polyurethane elastomer impregnated into the base fabric is flexible, does not have the stiffness of a stiff rubber-like structure, and is resistant to wrinkles. Polyurethane is required.

Polytetramethylene glycol is a molecule! #'soo~4
Preferably, a range of 000 is used. Examples of the organic diincyanate include diphenylmethane-4,4'-diincyanate and tolylene diincyanate.

Aromatic diincyanates such as xylylene diincyanate are preferred, but aliphatic diincyanates such as hexamethylene diincyanate, influorone diincyanate, alicyclic diincyanates such as synchlohexylmethane-4,4'-diincyanate can be used.

As the chain extender, it is necessary to use glycols.

When diamines are used, especially when applied to the above-mentioned base fabric, the texture becomes paper-like and hard, which is not preferable. As the glycols, low molecular weight glycols such as evaporated ethylene glycol and 1,4-butanediol are particularly preferred.

As a method for applying such a specific polyurethane elastomer to the uninvented base fabric, ordinary dry coagulation method, wet coagulation method, etc. can be applied, but polyurethane elastomer can be coated with an organic solvent such as dimethylformamide or dimethylacetamide. Particularly preferred is a wet coagulation method in which a base fabric is impregnated with a solution dissolved in a polyester, and coagulated with a non-solvent such as water, or a mixed solution of a solvent and a non-solvent, from the viewpoint of soft texture.

The sheet-like material thus obtained is dyed, raised, and, if necessary, subjected to antistatic, water-repellent, antifouling, and other treatments. When carried out industrially, these finishing processes are carried out using Winx dyeing machines.

Loco type jet dyeing machine, Zercula complete jet dyeing machine.

A Jigga complete dyeing machine or the like can be used.

For brushing, drum sander, belt sander,
A machine such as a cloth napkin can be used. For antistatic, water repellent, antifouling, etc., the solution or dispersion of each chemical is squeezed out at a predetermined squeezing rate using a pad or dip, and then dried using a pin tenter, grip ten coupe, etc.

A relaxation heat treatment step is inserted between these steps and/or in the final step at a temperature higher than the softening point of the polyurethane elastomer.

The softening temperature of the polyurethane elastic body here is width 2.5
This is the temperature at which a polyurethane dry film of C771, length 5 cIn starts to flow when it is pulled under a load of 1 kg. In the polyurethane elastomer used in the present invention, for example, the organic diincyanate component is diphenylmethane-4.
, 100 to 130 in the case of 4'-diincyanate
℃ range, so the temperature of relaxation heat treatment is 100 to 130℃.
It is sufficient if the temperature is higher than that. If the temperature of the relaxing treatment is below the softening point, the relaxing effect will not be sufficient and the resulting sheet material will shrink significantly due to the heat during rope making, making it unsuitable as a clothing material.

The relaxation heat treatment time is about 1 to 10 minutes or 1 to 5 minutes.
Minutes are good. When subjected to relaxation heat treatment for a period of 10 minutes or more, the polyurethane elastomer may decompose, and the hand becomes harder, which is preferable.

Industrial methods for loosening treatment include overfeeding with a dryer such as a pin tenku or grip tenter, and then shaking it off with a can, or using a 100 VCI dryer.
A method of rolling it up with a low tension of n or less, a method of relaxing treatment using a tumble dryer, etc. can be used.

When the sheet-like article of the present invention obtained by the method 1 above is used for clothing, it can be used in the steam of a Hoffman press used for finishing the mold during sewing, or in the drying process used for adhering interlining or dividing seams. To provide clothes with excellent tailoring that do not substantially shrink even when subjected to heat treatment such as heat or moist heat ironing.

Hereinafter, aspects of the present invention will be explained using Examples. The numerical values used in the examples are those expressed by the following evaluation method.

(1) Flexibility: Value measured by JIS L-107945° cantilever method (throat) (2) Wrinkle resistance: Value measured by JIS L-1096 wire method (%) (3) Shrinkage rate: Boiling at 100℃ underwater 3
Area shrinkage rate (%) when treated for minutes. According to studies conducted by the present inventors, the shrinkage rate in this evaluation method, which allows good tailoring to be obtained by sewing, is 3% or less.

Example 1 Polyethylene terephthalate (hereinafter abbreviated as PET) having a single fiber fineness of 0.1 denier was obtained by a direct spinning method.

) The fiber was cut into 31+ll11 pieces. On the other hand, short fibers of polyvinyl alcohol (hereinafter abbreviated as PVA) with a single fiber fineness of 1 denier and a cut length of 3 were prepared, and PET/PVA
They were mixed at a ratio of 70/30 i% and a sheet with a basis weight of 80 g was obtained by a papermaking method. 75d/ between these two sheets
A woven fabric with a plain weave structure and a fabric weight of 50 yen made of 361 PET false twisted yarn was inserted in a sandwich pattern to form a laminated sheet. From the front and back sides of this laminated sheet, 0.
From multiple nozzles with 21 orifices, 15
The ultrafine fibers were thoroughly entangled with each other and the fabric with the ultrafine fibers in three dimensions. Next, after drying this intertwined sheet, the front and back sides were raised using a belt sander equipped with a 240-mesh emery tape. Carboxyl methyl cellulose (CMC) was coated on the raised surface with Dokunai 7 to a thickness of 0.1 nn and dried.

Separately prepared prepolymer obtained from polytetramethylene glycol with a molecular weight of 200 and diphenylmethane-1I,4'-diincyanate was chain-extended with ethylene glycol. Impregnate the interlacing sheet, 20
It was coagulated in water at ℃ and then dried. Then, about 20 minutes in boiling water.
The PVA fibers and CMC were extracted and dried for a minute. The sheet-like material obtained in this way is dyed with disperse dye S using a Loco dyeing machine.
It was stained with umikaron Red-8BL 10% owf, and then reduced and washed with hydrosulfite powder 5% owf. Furthermore, the sheet was impregnated with a 1% aqueous dispersion of an acrylic acid ester-based antistatic agent and a silicone-based water repellent, and after squeezing the liquid with a mangle, a pin tenter dryer set at a temperature of 140°C was used to apply a 3% overfeed. It was dried at a temperature of 5 minutes with a residence time of 5 minutes. The obtained sheet-like material has fine suede-like naps on the surface, has an excellent lighting effect, has a softness level of 38%, and a wrinkle resistance level of 83%, which is surprising (it is very soft and wrinkle-resistant). Moreover, the shrinkage rate was 0.8%.

When this sheet-like material was sewn as fabric for a men's blazer, the interlining was glued (130°C) and the seams were separated (12
The resulting blazer did not shrink at all even when subjected to heat treatment such as finishing press (140°C) and finishing press (140°C), and the resulting blazer had a good tailoring appearance.

Patent applicant: Asahi Kasei Industries, Ltd.

Claims (1)

[Claims] A fiber sheet obtained by impregnating a base fabric made of a combination of nonwoven fabric and knitted fabric made of ultrafine fibers of 0.5 denier or less with a polyurethane elastomer made of polytetramethylene glycol, organic diincyanate, and a glycol chain extender. A method for producing a sheet-like product with excellent dimensional stability, characterized by subjecting a polyurethane elastomer to relaxation heat treatment at a temperature equal to the softening temperature during finishing processing.