JPH04240216A - Flame retardant acrylonitrile-based conjugate fiber - Google Patents

Abstract

PURPOSE:To obtain acrylic fiber for the purpose of flame retardancy and rust preventing properties for apparatus. CONSTITUTION:Flame retardant acrylonitile-based conjugate fiber is composed of a core component composed of an acrylonitrile-based polymer in which vinyl chloride or vinylidene chloride is copolymerized and a sheath component composed of an acrylonitrile-based polymer without containing a halogen element at (1/1)-(100/1) core/sheath ratio.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to acrylonitrile composite fibers having excellent flame retardancy.

0002

BACKGROUND OF THE INVENTION Acrylic fibers have many excellent chemical and physical properties such as dyeability, texture, and light resistance. However, in recent years, our living environment has become increasingly exposed to the risk of disasters such as fire, and as people's living standards have improved, there has been an increasing demand for flame retardant textile products, especially acrylic fibers. Flammability is becoming a major problem. Acrylic fibers lack flame retardancy, so their use in interior products such as curtains and carpets that require flame retardancy, clothing for infants and the elderly, etc. is avoided.

[0003] In order to improve this drawback, conventional methods include adding a flame retardant to the spinning stock solution for spinning, adding a flame retardant through post-processing, and mixing and spinning a flame retardant polymer and an acrylic polymer. Methods to do so have been considered, but none have yet been found to be fully satisfactory. This adds a large amount of flame retardant to impart flame retardant performance, which reduces the original physical properties and texture of acrylic fibers, and causes the flame retardant to fall off during dyeing and washing, reducing flame retardancy and causing permanent damage. The reason is that flame retardancy is difficult to obtain. Further, in the mixed spinning method, it is difficult to keep the spinning stock solution uniform and stable, and it is difficult to produce it industrially.

On the other hand, as a method of semi-permanently imparting flame retardancy, a method has been used in which alrylonitrile is copolymerized with a halogen-containing monomer, such as vinyl chloride or vinylidene chloride. In fact, fibers made of copolymers containing these monomers have considerable flame retardancy and are widely produced industrially. However, since these types of copolymers contain chlorine, which is a halogen element, they have the disadvantage that long-term contact with metals corrodes equipment during spinning and spinning processes.

[0005]

[Problems to be Solved by the Invention] In view of this situation, the present inventors have conducted extensive research and have developed a fiber that satisfies both flame retardancy and rust prevention properties.

[0006]

[Means for Solving the Problems] That is, the gist of the present invention is that the core component is 50 to 90% by weight of acrylonitrile and 10 to 5% by weight of acrylonitrile.
It consists of an acrylonitrile copolymer that is 0% by weight of vinyl chloride or vinylidene chloride, the sheath component is an acrylonitrile copolymer that does not contain a halogen element, and the core/sheath ratio is 1/1 to 100/1. It is a flame-retardant acrylonitrile composite fiber.

The flame-retardant acrylonitrile copolymer used as the core component is an acrylonitrile copolymer containing 50 to 90% by weight of acrylonitrile and 10 to 50% by weight of vinyl chloride or vinylidene chloride. If the amount of acrylonitrile is less than the above range, the spinnability will be affected and the performance of the resulting fiber will deteriorate, which is not preferable. On the other hand, if the amount exceeds the above range, sufficient flame retardancy cannot be provided.

On the other hand, if the amount of the comonomer is less than the above range, sufficient flame retardancy cannot be provided, and if it is too much, the coagulation behavior during spinning will be affected, which is inconvenient for producing excellent fibers. . Furthermore, as the acrylonitrile copolymer that is the sheath component, various commonly used copolymers that do not contain halogen elements can be used.

What is further required is that the ratio of the core to sheath is 1/
It is in the range of 1 to 100/1. When the core/sheath ratio is smaller than the above range, sufficient flame retardancy is not exhibited.
Moreover, when the core/sheath ratio is larger than the above range, sufficient rust prevention cannot be provided. The fibers of the present invention can be applied not only to general clothing but also to building materials such as interiors, partitions, and bedding.

0010

[Examples] The present invention will be specifically explained below according to Examples. "Flame retardant" is JIS K7201 (1976)
It was measured by It can be said that the higher the oxygen index, the higher the flame retardancy of the fiber. "Rustability" was evaluated by wrapping a sample around a stainless steel test piece (SUS304) and leaving it under saturated water vapor pressure at 80° C. for 3 days.

Example 1 A 15% by weight dimethylformamide solution of a copolymer consisting of 90% by weight of acrylonitrile and 10% by weight of vinyl acetate was used as a sheath, and a 25% by weight dimethylformamide solution of a copolymer consisting of 65% by weight of acrylonitrile and 35% by weight of vinylidene chloride was prepared. The core-sheath composite fiber arranged on the core was wet-spun using a conventional method using a mixed solution of dimethylformamide and water (70/30 (weight ratio) at 40°C as a coagulation bath, washed in boiling water, and 2. Stretched 5 times, then 1
After drying with a heating roller at 20°C, the fibers were further heat-treated to a fixed length using a heating roller at 200°C to produce the following fibers. Note that the core/sheath ratio was 3/1. Fineness 8d Flame retardant Oxygen index 27.0 Rust resistance
none

Comparative Example 1 A 15% by weight dimethylformamide solution of a copolymer consisting of 90% by weight of acrylonitrile and 10% by weight of heptadecafluorodecyl methacrylic acid was used as a sheath, and a 25% by weight solution of a copolymer consisting of 65% by weight of acrylonitrile and 35% by weight of vinylidene chloride was used. % dimethylformamide solution in the core was wet-spun using a conventional method using a mixed solution of 70/30 (weight ratio) of dimethylformamide and water at 40°C as a coagulation bath, and then spun in boiling water. The fibers were washed with water and stretched 2.5 times, then dried with a heating roller at 120°C, and further heat-treated to a fixed length using a heating roller at 200°C to produce the following fibers. The core/sheath ratio is 1/
It was set as 2. Fineness 8d Flame retardant Oxygen index 22.0 Rust resistance
none

Comparative Example 2 A 15% by weight dimethylformamide solution of a copolymer consisting of 90% by weight of acrylonitrile and 10% by weight of heptadecafluorodecyl methacrylic acid was used as a sheath, and a 25% by weight solution of a copolymer consisting of 65% by weight of acrylonitrile and 35% by weight of vinylidene chloride was used. % dimethylformamide solution in the core was wet-spun using a conventional method using a mixed solution of 70/30 (weight ratio) of dimethylformamide and water at 40°C as a coagulation bath, and then spun in boiling water. The fibers were washed with water and stretched 2.5 times, then dried with a heating roller at 120°C, and further heat-treated to a fixed length using a heating roller at 200°C to produce the following fibers. The core/sheath ratio is 11.
It was set as 0/1. Fineness 8d Flame retardant Oxygen index 30.0 Rust resistance
can be

Claims (1)

[Claims] 1. An acrylonitrile copolymer in which the core component is 50 to 90% by weight of acrylonitrile and 10 to 50% by weight of vinyl chloride or vinylidene chloride, and the sheath component is an acrylonitrile polymer containing no halogen element, A flame-retardant acrylonitrile composite fiber having a core/sheath ratio of 1/1 to 100/1.