JP2001172866A - Hygroscopic and exothermic cellulose-based fiber product having excellent heat retaining property - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cellulose-based fiber product having hygroscopic and exothermic properties and excellent heat retaining properties. SOLUTION: This hygroscopic and exothermic cellulose-based fiber product contains >=10 wt.% hygroscopic and exothermic cellulose-based fiber and has difference in fiber density in the direction of thickness of fabric and excellent heat retaining properties.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moisture-absorbing and exothermic cellulosic fiber product excellent in heat retention. More specifically, the present invention relates to a cellulosic fiber product using non-colored moisture-absorbing and heat-generating cellulosic fiber and having excellent heat retention.

[0002]

2. Description of the Related Art Hitherto, moisture-absorbing and heat-generating textile products have been commercialized as materials for general clothing such as winter sportswear, innerwear, casual shirts such as ski wear, ski pants, and snowboard wear.

[0003] Japanese Patent Publication No. 7-59762 discloses an acrylic acid-based moisture-absorbing, moisture-absorbing, heat-generating fiber as a moisture-absorbing, moisture-absorbing, heat-generating fiber. However, this fiber is an acrylic fiber and has a drawback that it has a characteristic pink color.

Japanese Patent Application Laid-Open No. 8-311767 discloses that an amino group, a synthetic fiber of nylon, polyester, acrylic, vinylon, polypropylene and polyethylene or a cellulose fiber is used.
A method for obtaining a wet heat-generating fiber by introducing a functional group of a carboxyl group is disclosed. However, although these fibers are excellent in heat build-up, there is no description about a fiber product having improved heat retention.

[0005] Japanese Patent No. 2888623 discloses that N-methylol (meth) acrylamide is used per 100 parts by weight of cellulose.
0.3 to 2.5 parts by weight, 5 to 45 parts by weight of at least one water-soluble vinyl polymerizable compound having a carboxyl group or an amino group represented by -COOX (X: H, NH ₄ or an alkali metal) is chemically bonded to generate heat. It is described as a permeable cellulose fiber. However, there is no description about a fiber product having improved heat retention.

[0006]

DISCLOSURE OF THE INVENTION The present inventors have conducted intensive studies on the above-mentioned problems, and as a result, have reached the present invention. That is, an object of the present invention is to provide a cellulosic fiber product which has heat absorption by moisture absorption and is excellent in heat retention.

[0007]

The present invention adopts the following means in order to solve such problems. 1. A moisture-absorbing and heat-generating cellulosic fiber product which contains 10% by weight or more of a heat-absorbing and heat-generating cellulosic fiber and has a fiber density difference in the thickness direction of the fabric and is excellent in heat retention. 2. 2. The moisture-absorbing and heat-generating cellulosic fiber product excellent in heat retention as described in 1 above, wherein the difference in fiber density in the thickness direction of the moisture-absorbing and heat-generating cellulosic fiber fabric is achieved by raising a fabric structure, a two-layer structure yarn or a fabric. 3. The moisture-absorbing and heat-generating cellulosic fiber is -COOX (X: H,
Or NH ₄ or an alkali metal), —SO ₃ X (X: H or NH ₄ or an alkali metal), a fiber having at least one of an amide group and an amino group, the moisture absorption described in the above 1-2. Exothermic cellulosic fiber products.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
Textile products in the present invention include cotton (cotton), yarn, woven fabric,
Includes secondary products knitted from these, such as knitted fabrics and nonwoven fabrics.

The cellulosic fibers used in the present invention are various cellulosic fibers such as cotton, hemp and regenerated cellulose. Further, other fibers may be mixed in the cellulosic fiber product. As fibers other than cellulose fibers to be mixed, polyester fibers, polyamide fibers, nylon fibers, synthetic fibers such as acrylic fibers, rayon fibers,
Examples include, but are not limited to, regenerated or semi-synthetic fibers such as triacetate fibers, and natural fibers such as silk and wool.

The moisture-absorbing and heat-generating cellulosic fiber in the present invention is obtained by subjecting a cellulose fiber to graft polymerization or chemical reaction of a hydrophilic vinyl monomer to give -COOX.
(X: H or NH ₄ or alkali metal), -SO ₃ X
(X: H, or NH ₄ , or an alkali metal), at least one of an amide group and an amino group is introduced, and a satisfactory moisture-absorbing and heat-generating cellulosic fiber can be obtained by these. . As an embodiment at this time, cotton, yarn, cloth and the like are used.

In the present invention, the hydrophilic group can be introduced by graft polymerization of a hydrophilic vinyl monomer or the like. In the case of a graft-polymerized fiber, the graft ratio is 2 to 30% by weight and cotton is used. It is preferable that the fiber is a fiber obtained by graft-polymerizing a hydrophilic vinyl monomer in the state described above. If the graft ratio of the fiber is less than 2% by weight, the effect is not sufficient. On the other hand, when the content exceeds 30% by weight, the hardening of the cotton and the decrease in the elongation occur, and the processability in the subsequent spinning process tends to deteriorate.

The hydrophilic vinyl monomer used in the present invention has a polymerizable vinyl group in its molecular structure and has an acidic group such as carboxylic acid and sulfonic acid and / or a salt thereof, and a hydrophilic group such as hydroxyl group and amide group. It is a monomer having a functional group.

Of these, preferred are carboxylic acid vinyl compounds, specifically, carboxylic acid vinyl compounds, such as acrylic acid, methacrylic acid, maleic acid, and the like.
Examples thereof include crotonic acid and butenetricarboxylic acid, and metal salts thereof. These may be used alone or in combination. Of these, methacrylic acid and acrylic acid are preferred from the viewpoint of graft polymerizability.

When these monomers are graft-polymerized onto cotton fibers, the monomers are used together with a polymerization initiator such as a redox system such as hydrogen peroxide and a ferrous salt, a peroxide such as potassium persulfate or ammonium,
Azo-based polymerization initiators such as 2,2 azobis hydrochloride and cerium salts such as diammonium cerium nitrate are used. As the polymerization initiator, a method of adding the polymerization initiator into a processing bath, a method of previously applying the polymerization initiator to fibers, and the like can be employed.

As a method of graft-polymerizing a hydrophilic vinyl-based monomer in the state of cotton, cellulose fibers are immersed in a processing bath such as an Overmeyer processing machine and heat-treated. 180mi below 5min
n or less, preferably from 30 ° C. to 120 ° C. for 30 min to 120 min. The processing atmosphere is preferably a nitrogen gas atmosphere. Thereafter, a deactivation treatment and a washing treatment of the polymerization initiator, an oil agent application, and a drying treatment are performed as necessary.

Further, as the graft polymerization method, radiation,
A method using an active energy ray such as an electron beam, an ultraviolet ray, and a microwave can also be adopted.

The content of the moisture-absorbing and heat-generating cellulose fiber in the present invention in the fiber product is at least 10% by weight, preferably at least 15% by weight, more preferably at least 20% by weight.

By simply using the moisture-absorbing and heat-generating cellulose fiber in the fiber product, it is not possible to obtain a fiber product excellent in heat retention, and the heat-absorbing heat generation in the clothes is not lost.
If the basis weight is increased by increasing the density or increasing the warp or weft, a satisfactory feeling cannot be obtained because the feeling of wearing is heavy. Therefore, as a method of maintaining the temperature in the clothes and improving the heat retention without changing the wearing feeling (lightness) of the related art, a feature is to give a fiber density difference in the thickness direction of the cloth.

Examples of the method of giving a fiber density difference in the thickness direction of the fabric include a method of forming a fabric structure such as a multi-weave, and a brushing process of the fabric, for example, a wet brushing, a dry brushing (emery brushing, a needle brushing, a brush brushing). Methods such as raising the skin side and roughening the side that comes in contact with the outside air by brushing, etc., and methods of forming a fabric with a two-layer structure yarn having a high fiber density at the core and a low fiber density at the sheath in the spinning process. Is mentioned.

[0020]

The present invention will be specifically described below with reference to examples. Manufacture of moisture-absorbing and heat-generating cellulose fibers Bleached cotton was treated with methacrylic acid 25.0 g / l, 2.2-azobis 2
Graft polymerization treatment was carried out with an aqueous solution of 0.5 g / l hydrochloride at a bath ratio of 1:40 at 80 ° C. for 120 min using an Overmeyer machine. Thereafter, washing with water and washing with hot water were repeated. The treated cotton is hereinafter referred to as “processed cotton”. At this time, the graft ratio was 10.38%. The graft ratio was measured by the following method.

Measurement of graft ratio (GT%): Absolute dry weight after graft polymerization and washing (W1) from absolute dry weight (W0) before reaction
Calculated from the rate of weight increase. Graft rate (GT%) = (W1-W0) x 100 / W0

Example 1 The core portion is made of processed cotton, the sheath portion is unprocessed cotton, and the weight ratio is 50/5.
A two-layer structure yarn having a value of 0 was produced. The fiber density of the core determined from the photograph of the yarn cross section is 72 fibers / 400 μm ² , and the sheath is 30 fibers / μm ²
Met. Weaving a broad woven fabric consisting of this yarn (40th cotton yarn x 40th cotton yarn / warp density 130 yarns / 2.54cm x weft density 70 yarns / 2.54cm), desizing, refining, bleaching, A fiber product having a density difference was obtained.

Example 2 A broad woven fabric composed of a two-layer structure yarn having a blended ratio of processed cotton of 35% by weight (cotton yarn of 40th warp × cotton yarn of 40th weft / warp density 13)
Weave 0 / 2.54cm × weft density 70 / 2.54cm), desizing,
It was refined and bleached to obtain a fiber product having a density difference in the thickness direction.

Example 3 In Example 2, instead of the two-layer structure yarn, a normal one-layer structure yarn was used, and a woven fabric was obtained in the same manner.

Example 4 A broad woven fabric composed of a two-layer structure yarn having a blending ratio of processed cotton of 20% by weight (cotton yarn of No. 40 warp × cotton yarn of no. 40 weft / density of warp 13)
Weave 0 / 2.54cm × weft density 70 / 2.54cm), desizing,
It was refined and bleached to obtain a fiber product having a density difference in the thickness direction.

Example 5 A broad woven fabric composed of a two-layer structure yarn having a blending ratio of processed cotton of 15% by weight (cotton yarn of No. 40 warp × cotton yarn of no. 40 weft / density of 130 yarns / 2.54 cm × 70 yarns of weft density / 2.54 cm), and was desizing, refining and bleaching to obtain a fiber product having a density difference in the thickness direction.

Comparative Example 1 In Example 4, a fiber product was obtained using a normal one-layer structured yarn instead of a two-layer structured yarn.

Comparative Example 2 The mixing ratio of the processed cotton was 0% by weight, that is, 100% by weight of pure cotton.
Broad woven fabric consisting of layered yarn (40th cotton yarn × 40th cotton yarn / warp density 130 / 2.54cm × weft density 70
Book / 2.54 cm) was woven, desizing, refining and bleaching to obtain a fiber product having a density difference in the thickness direction.

Comparative Example 3 In Comparative Example 2, a fiber product was obtained using a normal one-layer structured yarn instead of a two-layer structured yarn.

The exothermic temperatures of moisture absorption of the textile products of Examples 1 to 5 and Comparative Examples 1 to 3 were measured by the following methods. The results are shown in Tables 1 and 2.

Exothermic temperature of moisture absorption: After each product was absolutely dried (drying condition: 120 ° C., 3 hours), put in a desiccator,
The desiccator was placed in an environment of 30 ° C. and a relative humidity of 75% for 10 hours or more to control the temperature of the fabric.After that, a sample was taken out, and the maximum surface temperature of the product was measured by the NEC SEIEI Co., Ltd. TH3100
Was measured.

Heat retention: The heat retention was measured by the method described in JIS L-1096-A method (constant temperature method). Using a heat retention tester,
The obtained processed dough is attached to a constant-temperature heating element, and the amount of heat flowing out toward the low-temperature outside air becomes constant, and after 2 hours, the surface temperature of the heating element shows a constant value, and the dough penetrates and diffuses. Then, the heat loss (%) is calculated by the following equation from the obtained heat loss and the heat loss dissipated at the same temperature difference and time in a bare state without the dough. In the test results, conditions such as the temperature, the wind speed and the direction between the outside air and the surface of the heating element are added. Heat retention (%) = (1-B / A) × 100 where: A: Heat release amount of the heating element in the bare state [J / cm ² · S] B: Heat release amount when fabric is attached to the heating element [ J / cm ² · S]

Evaluation method when wearing heat-absorbing and heat-retaining properties:
The obtained processed fabric was sewn on a shirting fabric. Then, eight subjects were worn for 2 hours in an environment of 10 ° C. × 55% RH for evaluation. The exothermicity and heat retention were evaluated according to the following criteria. The evaluation method is as follows.

Evaluation of pyrogenicity: Eight subjects
The feeling of touching the cloth, which had been taken out of a completely dried sample cloth in a 55% RH room at 10 ° C., by hand was evaluated on a four-point scale, and the average was indicated. ：: Very warm. ：: Somewhat warm. Δ: Not somewhat warm. ×: Not warm.

Evaluation method of heat retention: The heat retention after wearing was evaluated on a 4-point scale by the eight subjects under the above conditions, and the results were indicated by the average score. A: Very good heat retention. ：: Good heat retention. Δ: Heat retention is slightly poor. ×: Poor heat retention. The obtained results are shown in Tables 1 and 2.

[0036]

[Table 1]

[0037]

[Table 2] From the results shown in Tables 1 and 2, the cellulose-based moisture-absorbing and heat-generating fiber product of the present invention contains 15% by weight or more of the moisture-absorbing and heat-emitting cellulosic fiber (processed cotton), and when there is a density difference in the thickness direction of the fabric, 2 It can be seen that the heat insulation is excellent by having the layer structure yarn.

[0038]

According to the present invention, it is possible to provide a cellulosic fiber product which has heat absorption by moisture absorption and excellent heat retention.

Claims (3)

[Claims] Claims: 1. A weight of 10 wt.
% Or more, and has a fiber density difference in the thickness direction of the fabric, and has excellent heat retention and is a heat-absorbing and heat-generating cellulosic fiber product. 2. The moisture-absorbing heat with excellent heat retention according to claim 1, wherein the difference in fiber density in the thickness direction of the moisture-absorbing and heat-generating cellulosic fiber cloth is achieved by raising a fabric structure, a two-layer structure yarn or a fabric. Cellulosic fiber products. 3. The moisture-absorbing and heat-generating cellulosic fiber is -CO.
OX (X: H or NH _FourOr alkali metal), -SO_ThreeX
(X: H or NH_FourOr alkali metal), amide group
And fibers having at least one of amino groups.
3. The moisture-absorbing and heat-generating cellulosic fiber product according to claim 1.