JPH03213532A - Hygroscopic blended yarn - Google Patents

Abstract

PURPOSE:To provide a hygroscopic blended yarn having excellent water absorbability and hygroscopicity and suitable for sport wears, etc., by blending hydrophobic polyester fibers with nylon 4 fibers having a boiling water shrinkage degree larger than that of the polyester fibers in a specific ratio. CONSTITUTION:Hydrophobic polyester fibers (preferably fibers prepared by employing terephthalic acid as the dicarboxylic acid component and also ethylene glycol as the glycol component) are blended (the nylon 4 fibers and the hydrophobic polyester fibers are preferably blended as a core portion component and a sheath portion component, respectively) with nylon 4 fibers having a boiling water shrinkage degree larger >=2% than that of the polyester fibers in a weight ratio of (30:70) to (80:20), preferably (50:50) to (70:30), to provide a hygroscopic blended yarn.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mixed yarn with excellent hygroscopicity. More specifically, the present invention relates to a novel mixed fiber yarn having water-absorbing properties and hygroscopic properties that can be used for clothing that requires hygroscopic properties, such as sportswear, bedding, towels, dish towels, and the like.

[Conventional technology]

Polyester fibers have traditionally been used in many fields because they have many excellent properties such as good dimensional stability, strength, and resistance to wrinkles.

However, with such excellent properties, Vs Ruho I
I-ester fibers also have the disadvantage of being inferior in hygroscopicity compared to hydrophilic fibers such as cotton due to the hydrophobic nature of polyester. Furthermore, although polyamide fibers have higher hygroscopicity than polyester fibers, the Young's modulus of the fibers decreases when they absorb moisture.

It cannot be said to be a comfortable material because of the increased frictional resistance with the skin and the sticky feeling.

Conventionally, in order to impart hygroscopicity to polyester fibers, there has been a method of distributing hydrophilic compounds such as polyalkylene/glycol at a stage prior to spinning, for example British Patent No. 682,
This method has been proposed in Japanese Patent No. 866 and Japanese Patent Publication No. 39-5214. However, in the former method, the amount of polyalkylene glycol blended is 7.5 to 2 watts, and its hygroscopicity is at most 2% at a relative humidity of 65 watts, compared to 8% for cotton under the same conditions. significantly low. In addition, in the latter method, the blending amount of polyalkylene glycol is 2 to 15 wt%.
Its hygroscopicity is also lower than that of cotton, which is unsatisfactory.2- ○ Similarly, in order to impart hygroscopicity to polyester fibers, a method of copolymerizing polyalkylene glycol with polyester during polyester polymerization was proposed in Japanese Patent Publication No. 1973- Although it is known from Japanese Patent Publication No. 3887 and Japanese Patent Publication No. 47-49175, its hygroscopicity is not much different from that of blends.

In addition to copolymers containing polyalkylene glycol in the polymer main chain, some research has also been conducted on so-called graft copolymers in which polyalkylene glycol is included in side chains on two sides of the polymer main chain. For example, the Journal of Polymer Science (Journa)
f Polymer 5science) Volume 14.

On pages 15 to 28 (1954), the copolymerization of polyethylene terephthalate and ω-methyl polyoxyethylene is studied. That is, it is a polyester fiber having oxyethylene groups as side chains. 1. Kaji IJ has stated that its behavior (dyeability) = 3 is not much different from the behavior of a block copolymer of polyethylene terephthalate and polyethylene glycol. Kakitata Special Publication No. 43-19037 has the
Attempts have been made to add (CH2CR20)nCH2CROHCH20)1 to introduce an oxyethylene group as a side chain. Furthermore, attempts have been made in Japanese Patent Publications No. 49-12815 and No. 48-8270 to introduce oxyethylene groups as side chains by adding . However, none of them has yet achieved sufficient hygroscopicity.

On the other hand, in Japanese Patent Application Laid-open No. 54-120730,
Water-absorbing, hygroscopic core-sheath whose sheath is made of a thermoplastic polymer such as noethylene terephthalate and whose core is a mixture of a polyalkylene glycol such as polyethylene glycol and a thermoplastic polymer such as polyethylene prephthalate. In JP-A-51-136924, the composite fiber has 4 parts of the sheath made of a thermoplastic polymer such as polyethylene terephthalate, and the core part is made of a block copolymer made of polyalkylene glycol and polyester.

Hygroscopic core-sheath composite fibers have been proposed. However, although composite fibers using polyester mixed or copolymerized with polyalkylene glycol in the core have improved physical properties such as oxidation resistance and abrasion resistance, their hygroscopicity is not satisfactory. .

On the other hand, it can be said that there is no research on preventing water absorption of polyamide and a decrease in Young's modulus during moisture absorption.

[Problem to be solved by the invention]

Under these circumstances, the inventors of the present invention aimed to create a blended yarn that has high hygroscopicity comparable to cotton while maintaining excellent easy-care properties, and that provides a comfortable feeling to wear even during exercise. The goal is to provide the following.

Another object of the present invention is to provide a blended fiber yarn that absorbs and releases moisture as quickly as cotton, yet has less sticky feeling when absorbing moisture.

[Means to solve the problem]

As a result of intensive studies to achieve the above object, the inventors of the present invention have developed a blended yarn of nylon 4 and 5-polyester fibers as a hygroscopic polyamide, in particular, nylon 4 fibers are used as the core and polyester fibers are used as the sides. Differential shrinkage blend yarn maintains excellent oxidation stability, abrasion resistance, and chemical resistance [Also, it has high hygroscopicity comparable to cotton and moisture absorption/desorption rate similar to cotton, and feels sticky even when absorbing moisture. The present invention has been achieved by discovering that the fibers can be reduced in amount.

That is, the present invention uses hydrophobic polyester fibers and nylon 4
In the mixed yarn made of fibers, the weight ratio of the nylon 4 fibers to the mixed yarn is 30% to 80% by weight, and the submerged shrinkage rate of the nylon 4 fibers is 2% higher than that of the hydrophobic polyester fibers. The present invention relates to a hygroscopic mixed fiber yarn characterized in that the yarn is larger than .

The hydrophobic polyester referred to in the present invention means 20℃ x 65
Refers to substances that have a moisture absorption rate of 2% or less based on RH%, and contain terephthalic acid as the main acid component, and alkylene glycols having 2 to 6 carbon atoms, such as thiethylene glycol, trimethylene glycol, tetramethylene glycol, pentamethylene glycol, and hexame 6. - Target polyesters whose main glycol component is at least one type of glycol selected from tyrene glycol. In such a polyester, part of its acid component terephthalic acid may be replaced with another difunctional carboxylic acid. Examples of such other carboxylic acids include isophthalic acid, 5-sodium sulfoisophthalic acid, naphthalene dicarboxylic acid, diphenyl dicarboxylic acid, diphenoxyethane dicarboxylic acid, and β-oxyethoxybenzoic acid.

difunctional aromatic carboxylic acids such as p-oxybenzoic acid,
Examples include difunctional aliphatic carboxylic acids such as sebacic acid, adipic acid, and oxalic acid, and difunctional alicyclic carboxylic acids such as 1,4-cyclohexanedicarboxylic acid. Further, a part of the glycol component of the polyester may be replaced with another glycol component, and such glycol components include the above-mentioned glycols other than the main component and other diol compounds such as neopentyl glycol, 3-methylbentanediol, cyclohexane- Examples include aliphatic, alicyclic, and aromatic diol compounds such as 1,4-dimetatool, nonanediol, 2-methyloctane-7=diol, bisphenol A, and bisphenol S.

Such polyesters can be produced by any method. For example, to explain polyethylene terephthalate, terephthalic acid and ethylene glycol are directly esterified, a lower alkyl ester of terephthalic acid such as dimethyl terephthalate and ethylene glycol are transesterified, or terephthalic acid and ethylene oxide are transesterified. The first stage reaction is to produce a glycol ester of terephthalic acid and/or its low polymer by reacting with It is easily produced by a two-step reaction.

In order for the blended yarn of the present invention to exhibit high hygroscopicity and excellent fiber physical properties, the polyester fiber constituting the side portion must contain terephthalic acid or its ester-forming conductor with 80 moles or more of the dicarboxylic acid component. It is preferable that there is, and most preferable as a glycol component i
- Ino is ethylene glycol.

The degree of polymerization of the polyester is preferably 0.5 or more in terms of intrinsic viscosity, particularly preferably 0.6 or more, in order to exhibit sufficient 81M physical properties.

Nylon 4 referred to as uninvented is, for example, U.S. Patent No. 4.28.
1,105, in the polymerization of 2-pyrrolidone with an alkaline polymerization catalyst in the presence of 802,
It is polymerized using quaternary ammonium ()sulfite as a polymerization accelerator, and may contain matting agents, antioxidants, etc.

Nylon 4 is a crystalline polymer that is insoluble in water.

Moisture absorption rate is 8.5 to 9 in an environment of 20℃ x 6s RH%
% and higher than 7-8% of cotton. Furthermore 2o'Cx85R
It has an extremely high moisture absorption rate of 14% for a 1" inch and 37% for a 20°C x 100RH square. There is no other polymer that has such a high moisture absorption rate under such high relative humidity. Nylon 4 is a very unique polymer.However, like conventional polyamides, nylon 4 has a low Young's modulus and a large drop in Young's modulus when wet, so when used alone, it feels sticky and is not necessarily a comfortable fiber. No. For this reason, it is important to mix fibers with polyester fibers that are hydrophobic polymers and have a high Young's modulus.

The blended yarn of the present invention includes a spinning blending method in which two extruders are used to spin each yarn from a 1-inch spinneret and then combining the yarns, and a drawing blending method in which two types of raw yarns are combined and drawn at the same time. , 2A value drawn yarns, or a mixed fiber method that combines these methods with fluid processing.

Fluid processing may be performed before, during, or after fiber blending.
-Fluid processing on a boat is interlace.

There is also Taslan processing.

Next, the ratio of nylon 4 fibers is 30wt% to the mixed fiber yarn.
~8θwt% is undesirable. When it is less than 3υwt%, the level of hygroscopicity becomes that of conventional nylon 6 and nylon 6.6, and the hygroscopicity is low. 8 I) If it exceeds wt%, the hygroscopicity is high, but the contribution of the high Young's modulus of the polyester fiber is small and the fiber becomes a low Young's modulus fiber, causing a shrinkage difference and arranging nylon 4-fibers in the core. The coverage of the nylon 4 fibers of the polyester fibers on the side is low, making it feel particularly sticky when wet.

More preferably, the ratio of nylon 4 fibers is 5 Q wt
% to 7 Q wt%.

The water saving shrinkage difference is 2 times higher for 4 nylon fibers than for polyester fibers.
Must be larger than %. The water-saving shrinkage rate in the present invention refers to the length of the section before and after flood treatment under a load of 0.05 r/denier, and the length of the treatment material is Jo.

lO-βl means the value of force expressed in 1 stone-X 100 when the length after treatment is 11. Submergence means hot water at 96°C, and flood treatment involves applying a load of 0.5 μ/denier to the sample and immersing it in hot water for 30 minutes.

If the flood shrinkage rate difference is less than 2%, the nylon 4 fibers will not be placed in the core, and it will feel sticky when wet. 0 Boiling water shrinkage rate difference is 2
% or more, the nylon 4 fibers are placed in the core and the polyester fibers are placed on the sides, and the fabric does not feel sticky when wet. More preferably, the shrinkage difference is 4% or more. The water-saving shrinkage rate depends on the stretching ratio, stretching temperature, etc. during stretching.

The moisture absorption rate QO of mixed fiber yarn at 20℃ and 65RH% is still 3%.
It is preferable that there be more than one. If it is less than 3s, it cannot be said that the comfort when worn is good. Also, it is desirable for H4 that the moisture absorption rate W is 1.0% for 15 minutes or more. If W is less than 1.0%, it will not be possible to sufficiently absorb sudden changes in the environment or increases in humidity within the clothing at the start of exercise. This moisture absorption rate Wil-i yarn is at a temperature of 1 ()
The total weight of the sample after drying in a dryer at 5°C to a constant weight (absolutely dry weight) was determined, and then the yarn was dried at 20°C with a relative humidity of 6.
Leave it in a 5% temperature and humidity chamber and measure the weight increase over time.

This is the value obtained by calculating the weight increase after 5 minutes using the following formula.

W = ((Yarn weight after 5 minutes - bone-dry yarn weight / bone-dry thread weight lX100 Furthermore, when the moisture absorption rate at 20°C x 85 RH% is Ql, Ql - Qo≧2% is Good.Qt -Q
o If it is less than 2%, no matter how high the absolute value of the moisture absorption rate is, the ability to lower humidity and maintain comfort even when the relative humidity in the space between clothing and skin increases due to sweating is too low.

The more comfortable the material is, the greater its ability to absorb sweat vapor at a relative humidity of 80% or higher, which humans find uncomfortable. Therefore, Qz −Qo≧2% or more is H4. [Effect of the invention] The mixed fiber yarn, which has nylon 4 fibers with high hygroscopicity in the core and hydrophobic polyester fibers on the side, has a high moisture absorption, water absorption level, and High moisture absorption and desorption rate.

Furthermore, since the hydrophobic polyester fibers are on the side when absorbing moisture, it does not feel sticky and has less of a drop in puffiness compared to polyamide, making it an extremely comfortable material.

In the present invention, the mixed fiber yarn preferably has a total fiber length of 30 to 150 deniers, and the denier of the single fibers constituting the mixed fiber yarn is preferably 0.5 to 3 deniers. And core S
It is preferable that the nylon 4 fibers constituting the side portion are thicker than the hydrophobic polyester fibers constituting the entire side portion.

A detailed explanation will be given below according to examples.

The polymers used in Examples and Comparative Examples are as follows.

A 3-chip of phenol/tetrafluorethane (a polymer produced from 2-pyrrolidone) at 30°C was used.

The nylon 6 chip used as a comparative example had [η]=1.
It is 4.

These chips were used as the kl component, and polyethylene terephthalate [η)-0,68'i was used as the other component.

Example 1 and Comparative Examples Nylon 4 was spun at a spinning speed of 800 m7 minutes, and polyethylene terephthalate was spun at a spinning speed of 80 U m7 min.

An undrawn yarn was obtained.

Two undrawn yarns were combined and simultaneously stretched 3.5 times by a roller and plate stretching method. This drawn yarn was heat-treated at a constant length of 220° C. for 12 seconds using an inner wall heater to perform an interlacing process. At this time, the mixed fiber yarn was 1 t) Od/48 f, and the weight ratio of nylon 40 was 50 t. Also nylon 4
Diving contraction suspension is 7%.

The water-saving shrinkage rate of polyethylene terephthalate was 3%14. For comparison, polyethylene terephthalate yarn 2
The book was similarly drawn 3.5 times to obtain a drawn yarn of 100 d/48 f. The water-saving shrinkage rate of this yarn was 7%.0 In addition, two nylon 4 yarns were similarly stretched 3.5 times, heat treated for 2 seconds at 220°C with a hollow heater, and the water-saving shrinkage rate was 7%. A drawn yarn of IUOd/48f was obtained.

Further, nylon 6 was spun at a spinning speed of 800 m for 7 minutes and drawn in the same manner to obtain a drawn yarn of 100 d/48 f.

The water saving shrinkage rate was 7%.

Circular knits were made from these drawn yarns, scoured and relaxed in a flood, and then sewn into shirts.

Qo of mixed fiber yarn = 4.6%, Ql-QO = 2.5%, Qo of polyethylene terephthalate = 0.4
%, Qt-Q.

=O, OS%, Qo of nylon 4 = 8.996%Q
1- Qo = s%1 QO of nylon 6 = 4%, Ql
-QO=1%.

In the case of polyethylene terephthalate, when wearing the resulting shirt and exercising to the extent that the shirt sweats lightly, the shirt feels like fins. In the case of Nylon 4, it was comfortable until I started sweating.

As soon as I sweated, the shirt seemed to cling to my skin and felt extremely sticky.

In the case of nylon 6, you will feel sweaty and stuffy in the first place.
As soon as I started sweating, I felt sticky.

Shirts made of blended yarns were comfortable both before and after sweating. The moisture absorption rate W of this mixed yarn was 3% and 15 minutes.

Example 2 A drawn yarn of nylon 4 of 75 d/36 f was heat-treated for 3 seconds with a hollow heater at 220° C., resulting in a water-saving shrinkage rate of 69.
6 threads were obtained. Also polyethylene terephthalate) 50d
A drawn yarn of /36f and a water-saving shrinkage rate of 3% were obtained. Align the two and apply interlacing to 125 d/72
A mixed fiber yarn of f was obtained. The proportion of nylon 4 is 60% by weight. A circular knit was made from this mixed fiber yarn, processed in the same manner as in Example 1, and a shirt was sewn.

The Qo of the mixed yarn was 5.4%, and Ql-QO was 3%.

Wear when exercising while wearing a shirt and sweating lightly Jt
i was very comfortable. Afterwards, I let it rest, but it didn't feel as cold as cotton, and my shirt dried.

Claims (1)

[Claims] In a mixed yarn consisting of hydrophobic polyester fibers and 4-nylon fibers, the weight ratio of 4-nylon fibers to the mixed yarn is 30% to 80% by weight, and the boiling water shrinkage rate of 4-nylon fibers is higher than that of hydrophobic polyester. A hygroscopic mixed fiber yarn characterized by having a shrinkage rate in boiling water that is 2% or more higher than that of the fibers.