JPH0457909A - Production of anti-pilling acrylic fiber - 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 Field of Application] The present invention relates to a method for producing acrylic fibers having excellent pile properties.

[Conventional technology]

Acrylic 1m! Compared to other synthetic fibers, it has a soft texture similar to that of pure wool, is bulky, and has excellent dyeability, and is used for clothing and interior decoration. However, when knitted fabrics made of acrylic fibers are worn, pilling, which is a tangle of fuzz, short hair, etc., occurs on the surface.
This has the practical drawback of spoiling the appearance of clothing and lowering its commercial value.

Against this background, many proposals have been made to prevent the occurrence of pilling. For example, JP-A-5
9-116409 discloses a method of rounding the cross-sectional shape of fibers to improve pile pilling properties under specific heat treatment conditions, and JP-A-59-192717 discloses a method for improving the tensile strength of fibers. , a method of improving pill resistance by controlling the knot strength and elongation within a specific range has been disclosed, but Ku
Not enough.

[Problem to be solved by the invention]

The object of the present invention is to provide acrylic*, iai, which has excellent pile-pilling properties and is suitable for clothing and the like.

[Means to solve the problem]

The gist of the present invention is that acrylonitrile is
A spinning dope containing an acrylonitrile polymer of 224 or more is wet-spun in a coagulation bath at a spinning draft of 17 to 1.4, and is made into fibers with swelling charcoal of 160 to 2504 to obtain a strength of sa.
The objective is to produce anti-pill acrylic fibers with p/d or more and a product of knot strength (t/d) and knot elongation (4) of 20 or less, and preferably the spinning stock solution contains 3 or less water. Then there it is.

The present invention will be specifically explained below.

The acrylonitrile polymer used in the present invention has a 90%
It is necessary to contain 4 or more acrylonitriles. If the content of acrylonitrile is less than this, it is not preferable because the physical properties of the fiber required as a clothing fiber will be impaired. Examples of copolymerizable heptamers include (meth)acrylic acid esters such as methyl acrylate and methyl methacrylate, vinyl acetate, styrene, and acrylamide. In addition, r-meth)acrylic acid to improve dyeing properties.
Examples include, but are not limited to, copolymerizing hydrophilic monomers such as methalylsulfonic acid and yavinylbenzenesulfonic acid.

Examples of the solvent for wet-spinning these monomers include organic solvents such as dimethylacetamide, dimethylformamide, and dimethylsulfoxide, and S salt-free solvents such as nitric acid, sodium rhodanate, and zinc chloride, but dimethylacetamide, Organic solvents such as dimethylformamide and dimethyl sulfoxide are preferred. This is because with inorganic salt solvents such as nitric acid, sodium rhodanate, and zinc chloride, the coagulation rate is slow, making it difficult to obtain the desired fibers.

The polymer concentration of the spinning dope is preferably 224 or less, more preferably 20 or less. This concentration is in a lower concentration range than the usual spinning stock solution concentration, and is one of the essential conditions for obtaining the washing/drawing yarn swelling degree and fiber physical properties described later.

Additionally, although it is related to the coagulation conditions, adding water to the spinning dope has the effect of making the cross-sectional shape of the fiber easier to shape from a bean shape to a round shape and improving the fiber luster. At the same time, improvements in passability during the spinning process (reduction in fuzz and thread breakage) and improvement in product texture were observed. The amount of water contained in the spinning dope is preferably 34 or less, more preferably 2
4 or less. If the water content in the spinning solution exceeds 30%, it is not desirable because the solution will gel, making spinning impossible.

Next, there are spinning conditions, and among these, the spinning draft is particularly important. It is known that when wet spinning acrylonitrile polymers, the fiber structure is regulated by the spinning draft and coagulation bath composition.
When using an aqueous coagulation bath, the spinning draft is set at 17 to 1.
4, preferably 19 to 1.2&C. If the spinning draft is less than 17, yarns will drift in the coagulation bath, impairing spinnability, and the desired #l fiber performance will not be obtained; if it exceeds 1.4, yarn breakage will occur frequently and operability will deteriorate significantly. let The spinning draft in the present invention is set higher than usual, and excellent pile pilling properties can be obtained in relation to the stretching ratio described later. This is thought to be due to the fact that in the overculm where coagulated threads are formed, the fiber microstructure is moderately destroyed by the action of the higher spinning draft (high tension) and has reached a level that meets the desired anti-pilling property. It will be done.

The composition of the coagulation bath is such that the solvent component is more preferably 30 to 404, and the water component is more preferably 70 to 604. The temperature of the coagulation bath is 30-60°C, preferably 40-50°C.

While washing the thus obtained coagulated thread in hot water,
Stretch ~6 times. Here, the stretching ratio is 1.5 to 6 times, preferably F13 to 6 times.

The swollen charcoal of the thread obtained by washing the solvent contained in the coagulated thread thus obtained and drawing it must be in the range of 160 to 2504, more preferably 200 to 22.
The range is 04.

The obtained drawn yarn is subjected to oil treatment, dry relaxation treatment, etc. in a conventional manner to obtain acrylic fibers. The product of knot strength and knot elongation or coefficient C is used to evaluate the pill resistance of acrylic fibers.
construction method is used.

If the knot strength of the R fibers is low, or if the knot elongation is low, even if pilling occurs on the surface of the clothing, the pill can be separated from the clothing and dropped off with a small amount of external force. Therefore, even if fuzz and short hair become entangled, the pill will fall off before it grows large, so it will not spoil the appearance of the clothing. The anti-pilling acrylic fiber M1 of the present invention has a product of knot strength and knot elongation of 20 or less, and anti-pilling properties evaluated by method C are grade 4 or higher.

〔Example〕

The present invention will be specifically explained below with reference to Examples.

"Ki" means parts by weight. "Knot strength (t/L)" and "knot elongation (lack)" were measured using J-K5-xJolslc.

Calculated from.

Calculated from (*centrifugal dehydration treatment 1000GX 10 minutes).

The anti-pilling J#im fiber was cut into 511 pieces and spun into a 1152 MG yarn using normal 2-inch spinning, knitted into a jersey fabric, and evaluated using the C method for 3 hours.

Example 1. Comparative Example 1 A copolymer consisting of 934 acrylonitrile, 64 methyl acrylate, and 14 sodium methallylsulfonate was dissolved in dimethylacetamide to obtain a spinning stock solution under the conditions shown in Table 1. This spinning stock solution was wet-spun, and stretched while washing the solvent in ring water to obtain a wet tow with a specific degree of swelling.

Subsequently, the wet tow was coated with an oil agent, dried with a heated roller at 150°C, and further subjected to relaxation treatment in pressurized steam at t 5 kg/ex" to obtain fibers with a single fiber fineness of 2 d/f. This fiber Cut it into 51■ and spin it with normal 2 inch spinning.
A spun yarn of 752M0 was knitted into a knitted fabric with a jersey texture and the anti-pilling properties were evaluated, and the results are shown in Table 1.

From Table 1, the concentration of the stock solution, spinning draft, swelling I
It can be seen that the desired pill resistance cannot be obtained due to a lack of any one of the IIIi degree, the stretching ratio, the strength of the obtained paddle fiber, and the product of knot strength and elongation.

Example 2. Comparative Example 2 A copolymer consisting of 934 acrylonitrile, 6 parts methyl acrylate, and 1 part sodium methallylsulfonate was used in the same manner as in Example 1, except that water was added to the spinning dope.
A spinning experiment was conducted under the conditions shown in , and the obtained acrylic 11! The anti-pilling properties of the fibers were evaluated. The results are shown in Table 2.

Table 1 As is clear from Table 2, any one of the following factors, such as stock solution concentration, spinning draft, washing/drawing yarn swelling degree, drawing ratio, strength of the obtained fiber, product of knot strength and elongation, etc., may be lacking, resulting in a failure to achieve the target resistance. It turns out that pill-like properties cannot be obtained.

Furthermore, when water was added to the spinning dope, K caused the cross-sectional shape of the fibers to change from a bean-like shape to a round cross-section, reducing yarn breakage, fuzz, etc. during the spinning process. In addition, the glossy window of the fibers has increased and the texture of the product has also improved.

〔Effect of the invention〕

The acrylic fiber obtained by the present invention has excellent pile-pilling properties and maintains an elegant glossy texture, making it useful as a textile for clothing.

Patent applicant: Sankei Rayon Co., Ltd.

Claims (1)

[Scope of Claims] 1. A spinning dope containing 90% or more of acrylonitrile and 22% or less of an acrylonitrile polymer is wet-spun in a coagulation bath at a spinning draft of 0.7 to 1.4, and the swelling degree is 160 to 160.
An anti-pilling acrylic fiber characterized by producing an acrylic fiber having a strength of 3.0 g/d or more and a product of knot strength (g/d) and knot elongation (%) of 20 or less when fiberized at 250%. Manufacturing method. 2. The manufacturing method according to claim 1, wherein the spinning dope contains 3% or less of water. 3. The manufacturing method according to claim 1, wherein the stretching is carried out at a stretching ratio of 1.5 to 6 times.