JPH03174012A - Acrylic fiber with good pill resistance - 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 novel acrylic fiber with good pill resistance.

[Prior Art] To produce acrylic fibers from acrylonitrile polymers, the acrylonitrile copolymer is usually dissolved in a solvent such as dimethyl sulfoxide, dimethyl formamide, dimethyl acedeamide, a rhodan salt aqueous solution, a zinc chloride aqueous solution, nitric acid, etc. The basic process is to dissolve it and use it as a spinning stock solution for dry, wet or dry-wet spinning to form an undrawn yarn, followed by stretching, washing, drying, and relaxation.

Each unit process in this basic process is an important process and greatly affects the characteristics and texture of the target final product, so the assembly of unit processes and the setting of their conditions have important industrial significance. have.

In the span knit field, where acrylic fibers are mainly used, especially in socks, underwear, etc., pill formation due to abrasion during use can significantly reduce product quality, practicality, and texture, and there is no way to counter this. desired. For this reason, various proposals have been made as methods for preventing the occurrence of pills.

Broadly speaking, they can be divided into methods that do not cause fluff, which is the main cause of pill formation, and methods that allow fluff to fall off before it forms a pill even if it does occur. The former generally has shortcomings such as poor durability of anti-pilling properties and its method depends on constraints on the morphology of the structure or texture of the knitted fabric, which limits practical product development. In order to provide practically advantageous anti-pilling properties, the latter method, that is, the method in which the fluff falls off before the fluff gets entangled and forms a pill, is effective, and commercially available acrylic fibers with good anti-pilling properties are Substantially, most of them are manufactured by the latter method.

A general method for removing the generated fluff before forming a pill is to design the fiber performance so that the fibers are easily cut when they are rubbed or entwined with each other, and the physical quantity is as follows: This is possible by significantly lowering the knot strength and elongation than usual. In order to significantly lower the knot strength and elongation than usual, it is necessary to change the raw material polymer and select special conditions for each unit process mentioned above.
It is often necessary to make major changes to unit process equipment.

[Problems to be Solved by the Invention] The object of the present invention is to effectively achieve anti-pilling properties using ordinary spinning dope and unit equipment for manufacturing acrylic fibers, without using such special polymers or unit process equipment. Our goal is to provide high quality acrylic fibers.

[Means for Solving the Problems] The present invention provides a mixture comprising an acrylonitrile polymer, an aluminosilicate and a titanium oxide, and a mixture ratio (weight) of aluminosilicate/titanium oxide of 10 to 100. 2
The acrylic fiber has good pill resistance and is characterized by containing ~5% by weight.

The present invention is to provide an acrylic fiber with good pill resistance by adding and mixing a mixture of aluminosilicate and titanium oxide into an acrylonitrile polymer for ordinary acrylic fibers as described above.

As the acrylonitrile polymer targeted by the present invention, polymers generally used for acrylic fibers can be used without any restrictions, and so-called modacrylic copolymers with an acrylonitrile content of 85% or less can be used. It can also be used. Monomers that can be used as copolymers include esters of acrylic acid and methacrylic acid, vinyl acetate, styrene, acrylamide, vinyl chloride, vinylidene chloride, etc., and methallylsulfonic acid for improving dyeability. Examples include soda, vinylbenzenesulfonic acid sorta, and vinylhyridine. This acrylonitrile copolymer may be produced by any conventional method such as suspension polymerization, solution polymerization, emulsion polymerization, etc.

The solvent for the spinning dope is a solvent that can dissolve the acrylonitrile polymer, such as organic solvents such as dimethylformamide, dimethylacetamide, dimethyl sulfoxide, and γ-butyrolactone, or inorganic solvents such as nitric acid, rhodan salt aqueous solution, and zinc chloride aqueous solution. arbitrarily selected from among. To add and mix a mixture of titanium oxide and aluminosilicate into an acrylonitrile polymer, add titanium oxide and aluminosilicate to a spinning stock solution in which the acrylonitrile polymer is dissolved in a solvent such as dimethylformamide, and add titanium oxide and aluminosilicate to the same organic solvent. It is sufficient to mix the mixed and dispersed liquid immediately before spinning.

As for the mixed composition of titanium oxide and aluminosilicate, the mixing ratio (gravity M) is 1:1 for titanium oxide and 10:1 for aluminosilicate.
-100 is desirable. In addition, the amount of titanium oxide contained in the acrylic fiber of the aluminosilicate mixture is 2 to 2.
The content is preferably 5% by weight.

Titanium oxide as a matting agent has been well known as an additive to acrylic fibers, but no improvement in anti-pilling properties has been observed regardless of the amount added. However, by using aluminosilicate in combination with titanium oxide, especially by keeping the mixing ratio (weight) of aluminosilicate and titanium oxide within a certain range, the anti-pilling properties can be greatly improved.
10 to 100 times the amount (weight) of titanium oxide,
Good results are shown when the amount added as a mixture is 2 to 5% by weight based on the acrylic fiber. If the mixing ratio of aluminosilicate to titanium oxide is less than 10, it is no different from a system containing only titanium oxide, but as it is 10 or more, the occurrence of fluff decreases and pill resistance improves. However, when it exceeds 100, the anti-fluff effect becomes poor again.

If the content of the mixture in the acrylic fiber is less than 2% by weight, there is no effect of improving anti-pilling properties, and if it exceeds 5% by weight, the fiber performance will decrease, resulting in a decrease in spinnability, resulting in a yarn with sufficient passability through subsequent processes. is not obtained. The aluminosilicate used in the present invention is not particularly limited in type as long as the powder particle size is about 1 micron, but kaolin is particularly preferred and exhibits the effect of improving pill resistance.

Kaolin, also known as Kōryōdo, is a substance well known as a smoothing agent in cosmetics and the like. As an additive to fibers, it is used as a drawability improver for bright yarns of polyester fibers because the refractive index is similar to that of polyester fibers, but as in the present invention, when used in combination with titanium oxide, new It is something that performs a function. The spinning method for obtaining the fibers can be any of the methods normally used for producing acrylic fibers, ie, dry spinning, wet spinning, and dry-wet spinning. After spinning, the acrylic fiber of the present invention can be obtained by performing treatments such as washing, stretching, drying, and heat treatment according to conventional methods.

[Example] The present invention will be explained in more detail with reference to Examples below. In addition, in the examples, % and parts simply mean weight % and parts by weight.

Example 1 24 parts of an acrylonitrile-based copolymer consisting of 94% acrylonitrile and 6% methyl acrylate is dissolved in 6 parts of dimethyl acedoide to prepare a spinning stock solution. On the other hand, 20 parts of a mixture of titanium oxide and kaolin with a particle size of 0.8μ thoroughly mixed at a mixing ratio (weight) of 1:79 was mixed and dispersed with 10 parts of the acrylonitrile copolymer and 174,170 parts of dimethylacetic acid. Prepare a dispersion liquid, mix the dispersion liquid with the spinning dope just before the spinning nozzle so that the total amount of titanium oxide 0.025% and kaolin 1.975% is 2.0%,
Wet spun. Thereafter, it was washed, stretched, dried, relaxed, finished, treated with oil, and cut using conventional methods to achieve a fineness of 2 denier.
Short fibers with a fiber length of 51ξ were obtained.

Including the following Examples and Comparative Examples, 2
It was knitted into a 0-gauge jersey fabric, and anti-pilling properties were evaluated for 5 hours using the ICI method.

Anti-pilling properties were evaluated on a 5-point scale: 5th grade: good, 3rd grade: no pilling, standard 1st grade: bad, a lot of pilling.As a result of the ranking, grades 4 and 5 or above were considered to have anti-pilling properties.

The results are shown in Table 1. It was proven that anti-pilling properties were significantly improved by adding kaolin mixed with titanium oxide.

Comparative Example 1 Short fibers were obtained in the same manner as in Example 1 except that titanium oxide and kaolin were not added.

Comparative Example 2 Only kaolin was added and the amount added was the same as in Example 1.1.
Short fibers were obtained in the same manner as in Example 1 except that the concentration was 975%.

Example 2 Titanium oxide and kaolin with a particle size of 0.9μ were mixed at a ratio of 1:99, and the amount added to the mixture was 1.00% (comparative example) 2.50% (invention) 3.30% (invention) 5.80% (comparative example), short fibers were obtained by the same treatment as in Example 1.

Comparative Example 3 Short fibers were obtained in the same manner as in Example 1, except that only titanium oxide was added in amounts of 1.00% and 2.00%.

Table 1 [Effects of the Invention] According to the present invention, it is possible to provide an acrylic fiber having knot strength and elongation properties that are almost the same as those of ordinary acrylic fibers, and also having good anti-pilling properties.

Claims (1)

[Claims] (1) Add a mixture of aluminosilicate and titanium oxide to an acrylonitrile polymer, with a mixing ratio (weight) of aluminosilicate/titanium oxide of 10 to 100.
An acrylic fiber with good anti-pilling properties characterized by containing % by weight.