JPS63165542A - Novel fiber material for clothing - 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] [Industrial application field] The present invention relates to a textile material for clothing that has particularly excellent moisture absorption.

[Conventional technology and problems]

It has long been well known that natural fibers regulate the humidity within clothing through their inherent moisture absorption, providing comfort, and animal-derived natural fibers such as silk and wool are the best in terms of humidity control function. However, it has only been put into practical use within a limited range due to ease of handling and economic efficiency. On the other hand, research on water-absorbing synthetic fibers to improve the moisture absorption and water-absorbing functions of synthetic fibers has been conducted, for example, by introducing hydrophilic groups into the polymer main chain (for example, Japanese Patent Publication No. 58-9166), and by adding hydrophilic compounds to polymers. A method of kneading it into the inside (for example, Tokuko Sho 5B-1050
No. 8, JP-A-57-61009, JP-A-58-104
No. 35), a method of applying a hydrophilic compound, etc. have been proposed. However, in both cases, the excellent functions originally possessed by synthetic fibers deteriorate, resulting in disadvantages such as poor durability and stiffness in terms of texture and feel when used as woven or knitted clothing. It had In addition, in the case of both natural fibers and hydrophilic synthetic fibers, if these woven or knitted fabrics come into contact with the skin while retaining moisture, the moisture retained on the fiber surface may cause discomfort, and the fibers that have absorbed sweat may cause discomfort. has high thermal conductivity and rapidly loses body heat, giving an unpleasant cooling sensation.

Further, studies have been proposed to improve the hygroscopicity of synthetic fibers, such as a method of treating the surface of polyester fibers with minute irregularities (for example, Japanese Patent Laid-Open No. 169574/1983). However, with the exception of mercerization and modification of rayon filaments (Japanese Unexamined Patent Publication No. 60-2707), no research has been conducted on improving the hygroscopicity of cellulose fibers.

As mentioned above, silk and wool are the best in terms of humidity control function, but they have problems in ease of handling and economy. As cotton and the like absorb sweat, the thermal conductivity of the m-knit fabric increases, so it absorbs body heat and gives a cool feeling. In order to improve comfort, it is important to quickly absorb sweat emitted from the human body and to not leave sweat on the areas where the skin contacts the woven or knitted fabric.

The present invention was developed as a result of studies to provide a mixed spun yarn that can be used as a material for woven or knitted fabrics having such desirable properties.

[Means for Solving the Problems] The present invention consists of a blended yarn or blended yarn containing modified natural cellulose fibers and modified regenerated cellulose fibers long or short fibers, and the proportion of regenerated cellulose fibers is is 3
The degree of modification of regenerated cellulose fibers is 0% or more and less than 80%, and the degree of substitution of hydroxyl groups is 0.10 to 0.
．． 24, natural cellulose fiber is 0 to 0.10,
And, when the degree of substitution of regenerated cellulose fiber is DSR and the degree of substitution of natural cellulose fiber is DSN, DSI? No D
The above-mentioned problems are solved by using a new textile material for clothing in which SN≧2.

The moisture absorption function can be greatly improved by carrying out modification by addition of glycidol, carboxymethylation, reaction with epichlorohydrin, etc., and controlling the ratio of regenerated cellulose fibers to 30% or more and less than 80%.

The limit of modification to improve hygroscopicity is that the fibers do not dissolve in water, and the degree of substitution during fiber modification has a large effect. Regarding the modification reaction, for example, taking a carboxymethylation reaction as an example, the degree of modification differs depending on the molecular weight of cellulose. In the case of viscose rayon, the degree of substitution by carboxymethyl groups is preferably about 0.15 to 0.18, and in the case of large molecular weights such as polynosic rayon, the best degree is about 0.19 to 0.22. If the degree of substitution is higher than this, it becomes easier to dissolve. The degree of substitution referred to herein refers to the degree of substituents for hydroxyl groups in the glucose units of cellulose, and is 3 at most.

Even if only the regenerated cellulose fibers are modified, the above-mentioned hygroscopicity can be obtained, but the strength decreases significantly, making it unsuitable for use. Although the above-mentioned hygroscopic properties can be obtained by modifying a blended yarn with a proportion of regenerated cellulose fibers exceeding 80%, there are problems in terms of strength.
It has drawbacks such as stickiness and pilling when wet. Even if a blended yarn containing less than 30% regenerated cellulose fiber is modified, high absorbency cannot be obtained, and even if only natural cellulose fiber is modified, it will become slippery when wet or look like it has been glued when dry. It has disadvantages such as hardening. As a modification method, a method is preferred in which the yarn structure is a blended yarn or a mixed fiber yarn, the proportion of regenerated cellulose fiber is 30% or more and less than 80%, and a modification reaction is carried out. According to this method, due to the difference in molecular weight and crystallinity between natural cellulose fibers and regenerated cellulose fibers, the modification reaction of regenerated cellulose fibers proceeds more easily, and the degree of shrinkage in the fiber length direction increases, so regenerated cellulose There is a tendency for the number of fibers to increase in the center of the yarn structure (as also described in Japanese Patent Publication No. 59-47070).

This method is considered to be the simplest and most economical.

It is more desirable to use a spun yarn with a core-sheath structure in which the natural cellulose fibers are on the outside when viewed from the yarn cross section.If the regenerated cellulose is long fibers, the natural cellulose fibers are placed on a shelf using a known method. A core-sheath structure can also be used. Furthermore, it is also possible to modify natural cellulose fibers and regenerated cellulose fibers before spinning and then form them into yarn. In the blended yarn of the present invention, fibers such as polyester, acrylic, nylon, etc. can be mixed and used within a range that does not impair its effects.

[Effect]

As explained above, the blended spun yarn or blended yarn of the present invention is
Since the amount of moisture absorption under relatively high relative humidity conditions (e.g., temperature 31°C, relative humidity 98% RH) is extremely high, it exerts its moisture absorption function as the temperature and humidity of the human body surface increases, causing an increase in the humidity of the environment inside clothing. to alleviate. Under conditions of low relative humidity, it has the same moisture-absorbing ability as other natural fibers, so it releases moisture due to a drop in vapor pressure as the humidity and temperature in the outside world decreases, preventing changes in temperature and humidity in the environment inside clothing. It can be alleviated. Furthermore, if there are more regenerated cellulose fibers in the center of the yarn structure, the moisture absorption rate of the regenerated cellulose fibers is high, so water released from the human body is quickly absorbed and moves to the center of the yarn. The water content in the area where the skin and the knitted fabric come in contact is low, and has the effect of significantly reducing stickiness. Because of this function, by using the blended yarn or blended yarn of the present invention, it is possible to obtain comfortable clothing materials such as underwear and socks that have less stuffiness and heat sensation and do not become sticky even after absorbing sweat. I can do it.

〔Example〕

The present invention will be explained below with reference to Examples and Comparative Examples. In these examples, cotton was used as the natural cellulose fiber and viscose rayon was used as the regenerated cellulose fiber.

A 30 count cotton/viscose rayon blend yarn was prepared according to a conventional spinning method. The resulting blended yarn was then modified by reaction with carboxy or epichlorohydrin. Carboxymethylation was performed according to the following recipe.

That is, monochloroacetic acid and sodium hydroxide in an amount 2.2 times the amount of monochloroacetic acid are dissolved in 80% ethanol, which is 6 times the weight of the blended yarn, and then the blended yarn is immersed in this solution.
After standing at room temperature for 30 minutes, the mixture was then reacted at 60° C. for 2 hours. After the reaction was completed, excess alkali was neutralized with acetic acid, washed several times with 80% ethanol in an amount six times the weight of the yarn, and dried using a vacuum dryer.

The degree of carboxymethylation (CM) was expressed as the degree of substitution (DS), and the measurement method was based on the quantitative method of Cosmetic Raw Materials Standards, Second Edition Commentary, Yakuji Nipposha, 284 (1984). .

The reaction with epichlorohydrin was carried out according to the following recipe.

That is, epichlorohydrin and epichlorohydrin 1
．． Add 2 times the amount of sodium hydroxide to 80 times the weight of the blended yarn.
% ethanol, the blended yarn was immersed in this solution, allowed to stand at room temperature for 30 minutes, and then reacted at 60° C. for 2 hours.

After the reaction was completed, excess alkali was neutralized with acetic acid, washed several times with 80% ethanol in an amount six times the weight of the yarn, and dried using a vacuum dryer.

The degree of reaction with epichlorohydrin was expressed as the degree of substitution (DS), and the measurement method was based on the 13CNMR method (Journal of Applied Polymer Science, Vol. 21, pp. 621-627).

To determine the degree of substitution for natural cellulose fibers and regenerated cellulose fibers, first quantify the degree of substitution of the modified blended yarn, then dissolve the regenerated cellulose fibers using the 60% sulfuric acid method or mixed acid method (JIS L-1030). , the degree of substitution of the residual natural cellulose fibers is determined by quantifying the degree of substitution using the following formula.

(DS of N) X (Ratio of N (%)) ÷ 100 = (
Total) os) - (R(7)DS) A mixed spun yarn was trial-spun. The strength of the yarns of each example and comparative example was measured, and the results shown in Table 1 were obtained. Also, the obtained thread is 18
The moisture absorption rate and thermal conductivity of the stockinette fabrics (basis weight: 150 g/m'') obtained by knitting with a gauge milling machine were compared, and the results are shown in Table 1.

〔Effect of the invention〕

As explained above, the blended yarn or blended yarn of the present invention has a high moisture absorbing function, exhibits the moisture absorbing function as the temperature and humidity of the human body surface increases, and can alleviate the increase in humidity in the environment inside clothing.

Therefore, by using the blended yarn or blended fiber yarn of the present invention, it is possible to obtain basic clothing such as underwear that is sensually less stuffy, less sticky, and has less heat window.

Furthermore, if the yarn is modified after being made into a blended yarn or a blended yarn,
The modification reaction progresses more easily in regenerated cellulose fibers, and due to the difference in the degree of shrinkage in the fiber length direction, regenerated cellulose fibers tend to have more fibers in the center of the yarn structure, so they have the texture of natural fibers, and It is possible to obtain clothing materials with less pilling comparable to cotton.

Claims (1)

[Claims] It is made of a blended yarn or mixed fiber yarn containing modified natural cellulose fibers and modified regenerated cellulose fibers, the proportion of regenerated cellulose fibers is 30% or more and less than 80%, and the degree of modification is such that the degree of modification is regenerated cellulose fibers. The degree of substitution of hydroxyl groups is 0.10 to 0.2 and natural cellulose fiber is 0 to 0.1.
0, and the degree of substitution of regenerated cellulose fiber is DSR
, when the degree of substitution of natural cellulose fiber is DSN, D
A new textile material for clothing with SR/DSN≧2.