JP2007162157A - Method for resin finishing of yarn for denim and denim fabric - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin finishing method for a denim yarn to give a denim fabric developing washing color fading different from the fading of conventional denim fabric without causing the stiffened touch and the lowering of tear strength by resin finishing, and provide a denim fabric produced by using the denim yarn as the warp. <P>SOLUTION: The resin finishing method for a yarn for denim fabric comprises the rope dyeing of a yarn of cellulosic fiber or a blended yarn of a cellulosic fiber and a synthetic fiber, the application of a resin finishing agent reactive with cellulose and a catalyst to the rope-dyed yarn and the heat-treatment of the obtained yarn. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a resin processing method of a denim yarn that is effectively used as a warp of a denim fabric, and a denim fabric using the denim yarn as a warp.

Resin processing with denim cotton is performed for the purpose of improving the form stability. In addition, it is known that discoloration changes when resin processing is applied to denim fabric. By using this action, compared to denim fabric that is not resin-processed, Appearance) can be changed in various ways.
However, due to the resin processing on the fabric, the resin processing agent acts on the wefts in addition to the warp yarns, resulting in a problem that the texture becomes hard and the tearing strength decreases.
Moreover, resin processing of the thread | yarn by cheese form has also been performed. However, in the case of cheese, there are problems such as unevenness in resin processing between the outside and inside of the cheese.

In Patent Document 1 (Japanese Patent Application Laid-Open No. 11-36153), a processing liquid containing a heat-crosslinkable resin, a crosslinking catalyst, and a spinning oil agent is attached to a raw cotton, dried, heated and heated after spinning or further knitting and sewing. It is described that the set is performed.
However, when resin processing is performed in the raw cotton state, since the resin is crosslinked in the fiber state, a processing device in the raw cotton state is required, and a subsequent drying step is required.

Patent Document 2 (Japanese Patent Application Laid-Open No. 2000-248468) describes a technique in which a fabric is coated with a resin and fiber intersections are firmly bonded with the resin.
However, even in Patent Document 2, since the resin processing is performed in the state of a fabric (woven fabric), a cross-linking reaction occurs in the warp and the weft, thereby causing a problem that the texture becomes hard and the tear strength is reduced. .

JP-A-11-36153 JP 2000-248468 A

  The present invention is an improvement of the above-mentioned problems, and it does not cause a hardening of the texture by resin processing, does not cause a decrease in tear strength, and makes it possible to produce a denim fabric that is different from the conventional one in terms of discoloration due to washing. It is an object to provide a method and a denim fabric using the denim yarn as a warp.

The present invention provides the following resin processing method for denim yarn and denim fabric.
[1] Denim characterized in that a cellulose fiber or a blended fiber of this and synthetic fiber is rope-dyed, and then a cellulose fiber-reactive resin processing agent is applied to the rope-dyed yarn, followed by heat treatment. Resin processing method for yarn.
[2] The resin processing method for denim yarn according to [1], wherein the yarn of the cellulosic fiber or the blended fiber of this and synthetic fiber is a cotton yarn or a blended yarn.
[3] The cellulose fiber-reactive resin processing agent comprises a compound having in the molecule at least two functional groups selected from aldehyde groups, epoxy groups, carboxyl groups, or methylol groups. The resin processing method of the thread | yarn for denim of [1] or [2].
[4] The resin processing method for denim yarn according to [3], wherein the cellulose fiber-reactive resin processing agent is an N-methylolurea compound.
[5] A denim fabric using, as a warp, a denim yarn processed by the resin processing method according to any one of [1] to [4].

  Since the present invention uses warp yarns that have been pre-dyed and processed with resin, it does not cause the texture of the denim fabric to harden and tear strength, which is a problem when processing resin with denim fabric. The discoloration state of can be changed variously.

The present invention is described in detail below.
The fiber of the yarn for denim of the present invention is a cellulosic fiber or a blended fiber of this and a synthetic fiber. Examples of the cellulosic fiber include cotton, hemp, viscose rayon, copper ammonia rayon (cupra), and tencel (refined). Cellulose), polynosic, acetate and other natural fibers and regenerated or semi-regenerated cellulose fibers, and these natural, regenerated or semi-regenerated cellulose fibers contain 50% by mass or less of synthetic fibers such as polyester, nylon, acrylic and polyurethane. It can also be used in a blended ratio. As the fiber used for the denim yarn, a mixed cotton yarn of 50% by mass or more of cotton is preferable from the texture and strength, and further, a cotton yarn of 100% by mass of cotton is most preferable.

In the present invention, first, the yarn used for the warp of the denim fabric is formed into a rope shape for rope dyeing. The rope-like thread is immersed in a dyeing solution tank containing an indigo dye dyeing solution in accordance with a conventional method, drawn out from the dyeing solution tank, and air-oxidized several times.
A sulfur dye or the like can be used for the dyeing liquid depending on the desired color. Also, the immersion time and the air oxidation time are set according to the desired color. Further, the number of repetitions of immersion and air oxidation is the same.

  Thereafter, the yarn is continuously dipped in an aqueous solution containing a resin processing agent and dried. Further, heat treatment is performed, and in some cases, unreacted processing agent is washed away.

  The resin processing of the present invention is a process for reacting with a hydroxyl group of cellulose to generate a cross-linking bond between fibers, and imparting a cellulose fiber-reactive resin processing agent and, if necessary, a catalyst to the rope-dyed yarn, Heat treatment is performed.

(1) Resin finishing agent The resin finishing agent of the present invention may be any as long as it reacts with a hydroxyl group of cellulose to form a crosslink. Such a compound is preferably a compound having in the molecule at least two functional groups selected from an aldehyde group, an epoxy group, a carboxyl group, and a methylol group, a dihydroxyethylene urea derivative, a melamine derivative, Ethyleneurea derivatives, epoxy derivatives, carboxylic acid derivatives, compounds having two or more of these reactive groups or mixtures thereof are used, for example, aldehydes such as glyoxal and glutaraldehyde, epoxy compounds such as diglycidyl ether, tetrabutane, etc. Examples thereof include polycarboxylic acids such as carboxylic acid, and fibrin-reactive N-methylol compounds such as dimethylol urea, trimethylol melamine, dimethylol ethylene urea, and dimethylol dihydroxyethylene urea. Among these, a fibrin-reactive N-methylol compound, a glyoxal resin, and the like are preferable, and an N-methylol urea compound is effectively used.

(2) Catalyst To the resin processing agent of the present invention, a catalyst or a co-catalyst and a catalyst can be added in order to increase the reaction activity between the resin processing agent and cellulose and perform resin processing quickly.
The catalyst is not particularly limited as long as it is usually a catalyst used for resin processing. For example, borofluoride compounds such as ammonium borofluoride and borofluoride sub-salt, neutral metal salt catalysts such as magnesium chloride and magnesium sulfate, Examples thereof include inorganic acids such as phosphoric acid, hydrochloric acid, and boric acid. It is preferable that the usage-amount of a catalyst is 10-15 mass% with respect to a resin processing agent.
These catalysts can be used in combination with organic acids such as citric acid, tartaric acid, malic acid and maleic acid as a co-catalyst, if necessary.
In addition, a softening agent for adjusting the texture or improving the tearing strength, a formalin catcher for reducing the free formalin concentration, and the like can be added to the resin processing agent as necessary. The tear strength indicates resistance when the external force applied to the fabric is unidirectional, and means a cutting load caused by a tensile force and a shear force generated by tearing.

  In the present invention, the resin processing agent is applied to the rope-like yarn, but the application method is not particularly limited, and a known method such as a normal pad-drying method, a coating method, or a spray method can be employed. -The dry method is efficient and preferable.

  In this case, the resin processing agent or the like can be used by dissolving in water, but the resin processing agent has a concentration of 2 to 10% by mass, particularly 3 to 8% by mass in the aqueous solution. This is preferable. The rope-dyed yarn can be immersed in an aqueous solution of the resin processing agent and then processed by a method such as squeezing it at an appropriate ratio. After processing in this way, heat treatment is performed.

(3) Heat treatment Heat treatment includes cylinder drying and baking treatment.
The cylinder drying is preferably performed at 130 ° C. for 70 to 90 seconds, and the baking treatment is preferably performed at 195 ° C. for 95 to 110 seconds.
The heat treatment temperature and time may be selected appropriately depending on the resin processing agent to be used.
After the heat treatment, the unreacted resin processing agent can be washed and removed as necessary. For this washing and removal, a method such as hot water washing at a temperature of 40 to 65 ° C. is used. be able to.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to the following Example.

[Example 1]
Dyeing / resin processing Cotton 7th yarn was made into a rope-like yarn, dipped in a dyeing solution mixed with 1.6 g / L of indigo dye for 30 seconds, and air-oxidized repeatedly 8 times. The resin processing agent is immersed for 2 to 5 seconds in an aqueous solution obtained by mixing RIKEN RESIN RG-17 (manufactured by Miki Riken Co., Ltd.), an N-methylol urea compound, at a ratio of 3.6% by mass in terms of solid content, and processed at a drawing ratio of 65%. did.
Thereafter, the rope-like yarn was treated with a cylinder dryer at a temperature of about 130 ° C. for 80 seconds, and then heat treated with a heat set tenter at a temperature of about 195 ° C. for 100 seconds.
Weaving dyed and resin processed 100% by weight cotton yarn No. 7 as a warp yarn of 65 yarns / inch, and weft yarn of normal cotton No. 10 yarn as 52 yarns / inch.

[Example 2]
The same procedure as in Example 1 was performed except that the mixing ratio of the resin processing agent was changed to an aqueous solution having a solid content of 5.4% by mass.

[Example 3]
The same procedure as in Example 1 was performed except that the mixing ratio of the resin processing agent was changed to an aqueous solution having a solid content conversion of 7.2% by mass.

[Comparative Example 1]
Comparative Example 1 was exactly the same except that the warp yarn of Example 1 was a yarn without resin processing.

[Comparative Example 2]
In Comparative Example 2, the warp yarn of Example 1 without resin processing was woven, and after weaving, the resin processing was performed by a pad dry method with an aqueous solution having a mixing ratio of the resin processing agent of 3.6 mass% as solid content. Except for this, it was exactly the same.
Test Method The characteristics of the sample woven as described above were measured by the following method. The results are shown in Table 1.
Shrinkage rate JIS L 1096
Maximum skew distance JIS L 1096 Tensile strength from fabric bend JIS L 1096 Tear strength of labeled strip JIS L 1096 Method D Pendulum method Stiffness ASTMD 4032-94

The test fabrics of Examples and Comparative Examples were (1) washed with a Munsell soap solution at 90 ° C. for 60 minutes, and (2) rinsed at 60 ° C. for 15 minutes.

Claims (5)

  A denim yarn characterized by subjecting a cellulosic fiber or a blended fiber of this and a synthetic fiber to rope dyeing, then applying a cellulose fiber-reactive resin processing agent to the rope-dyed yarn and subjecting it to heat treatment. Resin processing method.   The resin processing method for denim yarn according to claim 1, wherein the yarn of the cellulosic fiber or the blended fiber of this and synthetic fiber is cotton yarn or blended yarn.   The cellulose cellulose reactive resin processing agent comprises a compound having at least two functional groups selected from aldehyde groups, epoxy groups, carboxyl groups, and methylol groups in the molecule. Or the resin processing method of the thread | yarn for denim of 2.   4. The resin processing method for denim yarn according to claim 3, wherein the cellulose fiber-reactive resin processing agent is an N-methylol urea compound.   A denim fabric using, as a warp, a denim yarn processed by the resin processing method according to any one of claims 1 to 4.