JPS593574B2 - Manufacturing method of conductive mixed fiber yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a mixed fiber yarn having excellent conductivity and processability.

Conventionally, chemical fibers, particularly synthetic fibers such as polyester, polyamide, polyacrylonitrile, and polyolefin, or rayon, etc., have been produced and sold in large quantities not only for clothing but also for industrial use due to their many excellent fiber properties.

However, these chemical fibers tend to generate static electricity,
When used for clothing, there are disadvantages such as static electricity clinging to the human body, electric shocks caused by electrical discharge, and easy staining.For industrial use, there are problems such as spark discharge, which can cause industrial disasters such as fires and explosions. there were.

Therefore, many proposals have been made in an attempt to impart antistatic properties to the chemical fibers mentioned above, but proposals that satisfy practicality in terms of antistatic performance, durability, and retention of the fiber characteristics unique to the chemical fibers have been made. In the end, dust-proof and explosion-proof work clothes can be obtained by making full use of special conductive fibers, whose fiber performance is significantly different from chemical fibers such as metal fibers, metal-plated fibers, or carbon fibers, through special means. Alternatively, products such as carpets are simply offered on the market.

Recently, an antistatic fiber has been proposed in which polyethylene containing carbon black as a core component and polyester as a sheath component are concentrically spun (Special Publication No. 52
-31450).

This fiber is characterized by making the core component as thin as possible and adding pigments such as titanium oxide to the sheath component to prevent coloring due to carbon black, but technically it is necessary to reduce the single yarn denier. However, its main use is limited to carpets.

Furthermore, there are antistatic fibers in which carbon black is fused or coated on the surface of synthetic fibers, but like metal-plated fibers, it is not only technically difficult to manufacture multifilament yarns, but also carbon black is applied uniformly to the surface of the fibers. It is difficult to adhere to the fibers, and it is difficult to produce fibers with stable and constant antistatic properties with good reproducibility.

Furthermore, metal-plated fibers and carbon black-coated fibers may lose the metal or carbon black during the high-level processing of the fibers, and the antistatic properties may decrease when mixed with other types of filament yarns such as mixed fiber yarns. However, there are disadvantages in that it is difficult to mix the fibers or the fibers cannot be mixed uniformly due to differences in the surface characteristics of the fibers, such as the coefficient of friction.

The present inventors previously proposed a conductive fiber made of a mixture of at least two types of polymers, a fiber-forming polymer and an antistatic polymer containing carbon black, but as a result of further study, a specific means was proposed. We have discovered a conductive organic multifilament yarn that retains the characteristic electrical conductivity of the fiber and has excellent blendability with non-static multifilament yarn, and have accomplished the present invention. be.

The purpose of the present invention is to provide an appearance and texture that is substantially the same as that of a yarn made only of non-antistatic multifilament yarn.
An object of the present invention is to provide a method for producing a conductive mixed fiber yarn having yarn characteristics.

Such objects of the present invention can be achieved by the invention described in the claims.

First, the non-static multifilament yarn used in the present invention includes various conventionally known fiber yarns and is not particularly limited, but preferably polyester, polyamide, polyacrylonitrile, and other fiber-forming yarns. Multifilament yarns made of polymers, multifilament yarns made of viscose or derivatives thereof such as viscose, cupro, and acetate are preferred, and these may be used alone or in combination.

The conductive organic multifilament yarn is made of at least two types: a fiber-forming polymer and an antistatic polymer whose molecular chain is composed of polyalkylene glycol units, and the antistatic polymer contains carbon black. It is preferable to use side-by-side or core-sheath composite fibers in which carbon array fibers are uniformly dispersed and blended (carbon array fibers) or ordinary synthetic fibers as one component of the composite, and the carbon array fibers are used as one component of the composite. Can be used.

Such fibers are basically disclosed in Japanese Patent Application Laid-Open No. 52-103525.
The conductive organic multifilament of the present invention is obtained by spinning a mixed polymer solution containing the fiber-forming polymer and an antistatic polymer blended with carbon black as disclosed in the above publication. The yarn must satisfy the following fiber properties.

That is, first of all, the conductivity is high, and at 20°C, 40%
The electrical resistivity at RH is 10 6 Ω·α or less, preferably about 10 5 to 10 2 Ω·f, and the hot water shrinkage rate is higher than that of non-static multifilament yarn, preferably 1
~15% greater, and the coefficient of dynamic friction between the thread and the system measured by the Rator method is about 0.3 or less, preferably 0.25 or less.

In other words, if the electrical resistivity exceeds 106 Ω/f, the electrical resistivity of the mixed yarn cannot be lowered unless the mixed fiber ratio is increased as much as possible, and if the hot water shrinkage rate is outside the above range. This is not preferable because it becomes difficult to sufficiently arrange the conductive multifilament yarn in the center of the mixed fiber yarn by the relaxation heat treatment described below.

Furthermore, fibers with exposed carbon black on their surfaces, such as the conductive organic multifilament yarn, generally have a large coefficient of friction (although it is difficult to uniformly blend, knit, and knit with other general-purpose fibers, in the case of mixed fibers, Similarly, in order to uniformly mix the fibers with good productivity, it is desirable that the coefficient of friction be about 0.3 or less.

The conductive organic multifilament yarn having such fiber properties is made of a fiber-forming polymer, preferably at least 80 mol% of AN known for producing acrylic fibers and 20% of AN.
Copolymer of one or more vinyl group-containing monomers of mol % or less 5
5 to 95% by weight of an antistatic polymer that is miscible with the fiber-forming polymer and is substantially incompatible, such as an antistatic polymer with an average molecular weight of at least 10 for the AN copolymer.
A mixed polymer of 5 to 45% by weight of a block polyether polyester which is a reaction product of 00 polyethylene glycol and polyester, or a graft copolymer of a vinyl monomer such as AN to the block polyether polyester, and has antistatic properties. Wet-spun a spinning dope in which carbon black is uniformly dispersed, and a high molecular weight cationic oil agent whose main ingredients are polyethylene polyamine, stearic acid diamide ethosulfate, and behenic acid amide amine derivatives is used as an oil agent. It is better to process it.

In addition, in order to maintain the electrical resistivity at about 106 Ω or less, sufficient stretching is performed before densification to fully orient the antistatic polymer in the direction of the fiber axis, and at the same time, the antistatic polymer is It is preferable to arrange the carbon black in a linear manner for stabilization.

The hot water shrinkage rate of the conductive organic multifilament yarn obtained by controlling the draw ratio and heat treatment conditions in this drawing process is set to a value 1 to 15% higher than the shrinkage rate of the non-static multifilament yarn to be mixed. Set.

The conductive organic multifilament yarn thus obtained is mixed with a multifilament yarn made of various synthetic polymers such as polyester, polyamide, polyacrylonitrile, or cellulose multifilament yarn by a known method.

In this case, it is necessary to mix the conductive organic multifilament yarn of the present invention within a range of 0.5 to 60% by weight based on the total filaments constituting the mixed fiber yarn.

By blending the conductive organic multifilament yarn within the above range of 0.5 to 60% by weight, the mixture consisting essentially of non-antistatic multifilament yarn, which is a feature of the conductive mixed fiber yarn of the present invention, can be used. It has the same appearance, texture, strength, and other physical properties as fiber yarn, and also has a high degree of antistatic property.

After the blending, the conductive organic multifilament yarns are placed in the center of the blended fibers by subjecting them to relaxation heat treatment in dry heat, wet heat, preferably steam at 80 to 130°C.

The blended yarn thus obtained exhibits excellent antistatic performance with an electrical resistivity of 108Ω・α or less at 20°C and 40%RH, and has various yarn qualities such as wrinkle-free appearance, texture, bulkiness, and mechanical properties. Since it is the same as a mixed yarn made of non-static multifilament yarn, it can be used for various control purposes by using various knitted fabrics made of the conductive mixed yarn alone, or by mixing, knitting, and weaving ordinary spun yarns, mixed yarns, etc. Electric textile products can be changed.

For example, a woven fabric made of the conductive mixed fiber yarn can be used as a lining for conventional Japanese clothing made of synthetic fibers, greatly increasing its commercial value.

Example 1 14 parts of a polymer obtained by grafting AN to a block polyether polyester consisting of polyethylene adipate and polyethylene glycol (molecular weight 2000), 7 parts carbon black, 5 parts polyoxyethylene oxytetramethylene glycol having a molecular weight 2000, and dimethyl sulfoxide (DMSO) ) 125 parts well stirred with a homomixer,
This dispersion was mixed and spun with a DMSO solution of an AN polymer consisting of AN/methyl acrylate/sodium methallylsulfonate (93,6/6.010.4 mol %).

The carbon black addition rate was 7.0% by weight based on the weight of the fiber, the fibers were stretched 7.0 times, and a POIJ ethylene polyamide type cationic oil was used as the process oil.

After the dry heat treatment, it was treated with lauryl phosphate potassium salt as a finishing oil agent to form a 60D-8 fil, which was split to obtain a 15D-2 fil conductive organic multifilament yarn.

Electrical specific resistance 5 x 103Ω・I, tensile strength 2.3%, tensile elongation 14.3%, diving contraction rate 11.5%, friction coefficient 0.2
The fiber quality was 2.

Nylon 6 BCF (1
300D-70fil) was manufactured.

The material was subjected to relaxation heat treatment in heated air to induce shrinkage.

The boiling water shrinkage rate of the nylon BCF after treatment was 4.5%.

1300D-70f using normal interlacing equipment
il nylon BCF mixed with the above 15D-2fil conductive chifilament yarn to make 1315D-7.
A 2fil conductive nylon BCF was manufactured.

The antistatic performance of a loop carpet obtained by tufting using this conductive nylon BCF was evaluated by measuring the charged potential of a human body walking on the carpet.

The measurement force method was based on the method described in Fujiwara, Hirayo, and Sengaku-shi.

The measurement conditions were cowhide shoes and relative humidity of 20% and 40%.
%RH.

The human body charging potential was 1.5 KV at 20% RH and 1.2 KV at 40% RH, indicating extremely good antistatic performance.

On the other hand, the loop carpet using nylon BCF that does not contain conductive organic multifilament yarn of the present invention shows a high human body charging potential of 10 KV at 20% RH and 7 KV at 40% RH, and causes a strong electric shock when it comes into contact with a doorknob. What I felt was confirmed.

Furthermore, as a result of increasing the contraction rate of the conductive organic multifilament yarn so that it exists in the center of the fiber aggregate, the appearance of the tufted carpet is good, and the contamination of the conductive organic multifilament yarn is hardly noticeable. I understand.

Example 2 In the same manner as in Example 1, carbon black was mixed in an amount of 7% by weight based on the weight of the fibers and wet-spun.

Two stages of stretching were carried out at a total magnification of 7.5 times, and a polyethylene polyamide type cationic oil was used as the process oil.

After the dry heat treatment, the yarn was treated with lauryl phosphate potassium salt as a finishing oil to obtain a 75D-12fil conductive organic multifilament yarn.

Tensile strength: 2.5 g/d, tensile elongation: 16.2%. The yarn had a boiling water shrinkage rate of 9.0%, an electrical specific resistance of 7×10 3 Ω, and a friction coefficient of 0.21.

- force, tensile strength of 75-36 fil polyester filament obtained by conventional method 4.8 g, 2.

The tensile elongation was 32% and the boiling water shrinkage was 6.5%.

75D-12fil conductive organic multifilament yarn and 75D-36fil polyester filament
1 was combined with thread.

A normal up twister was used and a twist number of 20T/M was applied.

A twill fabric with a weave structure of 90×60 (strands/inch) was woven using East Tetron yarn 150 D-48fit for the warp and weft yarns.

At that time, part of the conductive mixed fiber yarn obtained above was inserted into the warp yarn in a striped manner.

The antistatic performance of the resulting fabric was evaluated, and the results shown in Table 1 were obtained.

Frictional charging voltage was measured at 20°C after 10 washes.

As shown in Table 1, in which Kinukin No. 3 was used as a friction cloth in a 30% RH atmosphere, it was found that the fabric using the mixed yarn of the present invention had good antistatic performance.

Comparative Example 1 In Example 1, lauryl alcohol E, 0 (20 mol) adduct was used as the process oil and lauryl alcohol E, 0 (5 mol) adduct was used as the finishing oil, and the friction coefficient was 0. Thirty-five conductive organic multifilament yarns were produced.

An attempt was made to mix the oil-treated multifilament yarn with nylon BCF in the same manner as in Example 1, but uniform mixing was not possible.

Comparative Example 2 In Example 1, the amount of carbon black added was lowered and 2
Electrical specific resistance at 0℃ and 40%RH is 5 x 108Ω・
cIrL (A sample), 3X107Ω・Cr11 (B
A conductive organic multifilament yarn (sample) was obtained.

As in Example 1, a loop carpet was prepared by mixing the fibers with nylon BCF, and the human body charging potential was measured.
7.3Kv (A sample) and 4.2K at %RH, respectively
v (sample B), which was lower than when only nylon BCF was used, but the antistatic property was insufficient.

Claims (1)

[Claims] 1. When blending a non-static multifilament yarn and a conductive organic multifilament yarn, the hot water shrinkage rate is 1 to 15% compared to the non-static multifilament yarn.
A conductive organic multifilament yarn having a dynamic friction coefficient of approximately 0.3 or less by radar method and an electrical resistivity of 106 Ω・α or less at 20°C and 40% RH is used as the total component of the mixed fiber yarn. Approximately 0.5~ per filament
A method for producing a conductive mixed fiber yarn, which comprises mixing the fibers within a range of 60% by weight and then subjecting them to relaxation and shrinkage treatment. 2 The conductive organic multifilament yarn is composed of at least two types of fiber-forming polymer and an antistatic polymer containing polyalkylene glycol units as a main component, and the antistatic polymer contains carbon black. These fibers are dispersed and oriented in the fiber axial direction.