JPH08269815A - Flame retardant acrylic synthetic fiber excellent in light fastness - Google Patents

Abstract

PURPOSE: To obtain a flame-retardant acrylic synthetic fiber good in dyeability, transparency and operating efficiency by forming a polyblend consisting essentially of an acrylonitrile-based polymer containing vinyl chloride and/or vinylidene chloride into fiber. CONSTITUTION: This flame retardant acrylic synthetic fiber is obtained by preparing a polyblend of a copolymer, containing 20-60wt.% monomer of the formula (X is H or CH3 ) and having 2000-50000 molecular weight with an acrylonitrile-based polymer containing vinyl chloride and/or vinylidene chloride so as to provide 0.1-3wt.% content of the monomer of the formula based on the acrylonitrile-based polymer and forming the resultant polyblend into fiber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame-retardant acrylic synthetic fiber having excellent light resistance.

[0002]

2. Description of the Related Art Acrylic synthetic fibers are widely used for clothing and bedding because of their excellent texture and dyeability. However, under the present circumstances, the fibers are easily yellowed by light or heat and are practically restricted. In particular, modacrylic fibers containing chlorine as a copolymerization component have a problem that they are easily yellowed by light or heat.

In order to improve such problems, it has been investigated to use, for example, a hindered phenol type antioxidant and a sulfur type antioxidant, but these methods are effective for olefin type synthetic fibers. However, there is a problem that it is less effective for acrylic synthetic fibers. Further, for example, Japanese Patent Publication No. 2-15642 proposes modacrylic fiber added with an ultraviolet absorber which is a benzotriazole compound, and Japanese Patent Application Laid-Open No. 2-33315 proposes modacrylic fiber added with organic tin. In the case of wet spinning, the yield is poor due to the elution of the ultraviolet absorber and organic tin into the coagulation bath, and there is a problem that the dyeability and transparency are adversely affected. Further, the use of rutile-type titanium dioxide to improve light resistance is performed in the paint field, but when applied to fibers, there is a problem in hardness and spinning operability, and in the fiber field, rutile-type dioxide is used. The current situation is that titanium is not used.

[0004]

Thus, although various attempts have been proposed to improve the light resistance of flame-retardant acrylic synthetic fibers, they have good dyeing properties, transparency, operability, etc. No flame-retardant acrylic synthetic fiber with good quality was obtained. The present invention has been made in view of the above problems, the object is good dyeability, transparency, operability,
It is intended to provide a flame-retardant acrylic synthetic fiber having excellent light resistance.

[0005]

The above-mentioned object is to provide an acrylonitrile-based polymer containing vinyl chloride and / or vinylidene chloride, and a general formula:

Embedded image And a molecular weight of 20 containing 20 to 60% by weight of the monomer
Content of the monomer is 0.1 to 3% by weight with respect to the acrylonitrile polymer.
It is achieved by a flame-retardant acrylic synthetic fiber excellent in light resistance, which is obtained by polyblending so that

The present invention will be described in detail below.

The acrylonitrile polymer containing vinyl chloride and / or vinylidene chloride used in the present invention includes acrylonitrile 30 to 80% by weight, vinyl chloride and / or vinylidene chloride 20 to 70% by weight, and unsaturated monomer 0 to An example is one composed of 10% by weight. Among the unsaturated monomers, a sulfonic acid group-containing monomer is particularly preferable because it imparts denseness and dyeability to the fiber. Examples of the sulfonic acid group-containing monomer include sodium allyl sulfonate, sodium methallyl sulfonate, sodium vinyl sulfonate, sodium styrene sulfonate, sodium 2-acrylamido-2-methylpropane sulfonate, and the like.

The acrylonitrile polymer is produced by a known polymerization method such as aqueous suspension polymerization, emulsion polymerization, solution polymerization, etc., and is not particularly limited.

The monomer represented by the general formula (1) used in the present invention is 2- (2'-hydroxy-5'-methacryloxyethylphenyl) -2H-benzotriazole, or 2- (2'-. Hydroxy-5'-acryloxyethylphenyl) -2H-benzotriazole. The amount contained in the copolymer of the above monomers needs to be in the range of 20 to 60% by weight, preferably 30 to 50% by weight. If it is less than 20% by weight, the effect of improving the light resistance is insufficient, and if a large amount of a copolymer having a content of less than 20% by weight is added, the flame retardancy of the obtained flame-retardant acrylic synthetic fiber may be decreased or The physical properties of the fiber are adversely affected, such as the decrease in heat resistance. On the other hand, if it exceeds 60% by weight, coloring of the copolymer and deterioration of heat resistance are unfavorable.

40 to 80% by weight of the monomer other than the monomer represented by the general formula (1) is not particularly limited, and examples thereof include acrylonitrile, styrene and
Examples thereof include methacrylic acid derivatives such as methyl methacrylate, acrylic acid derivatives such as methyl acrylate, and the like. Also, sulfonic acid-containing monomers such as sodium allyl sulfonate, sodium methallyl sulfonate, sodium vinyl sulfonate, sodium styrene sulfonate, sodium 2-acrylamido-2-methylpropane sulfonate, and acidic monomers such as acrylic acid and methacrylic acid. It is also possible to use a part of the above.

The molecular weight of the copolymer used in the present invention must be 2,000 to 50,000 in terms of polystyrene equivalent in gel permeation chromatograph (GPC). When the molecular weight is less than 2000, it is not preferable because it is eluted in the coagulation bath during wet spinning and the yield becomes poor. On the other hand, when the molecular weight exceeds 50,000, the solution viscosity of the polymer becomes high and it becomes difficult to add and mix the polymer into the spinning dope, which is not preferable.

Such a copolymer is produced by a known polymerization method such as aqueous suspension polymerization, emulsion polymerization, solution polymerization and the like, and is not particularly limited.

The content of the monomer represented by the general formula (1) is 0.1 to 3% by weight, preferably 0.2 to 2% by weight, based on the acrylonitrile polymer. . If the content is less than 0.1% by weight, the effect of improving the light resistance cannot be obtained, while if it exceeds 3% by weight, coloring and heat resistance decrease, and the monomer represented by the general formula (1) is It is expensive and not economically preferable.

The copolymer used in the present invention is preferably obtained by directly polymerizing in a solvent or by adding a solution of powder in a spinning solvent to a spinning solution and spinning. It is also possible to add it before polymerization and polymerize it, or to pre-blend it with an acrylonitrile polymer and melt-spin it.

The fiber spinning method of the present invention may be wet, dry or dry / wet spinning and is not particularly limited. As an example, when dimethylformamide is used as the solvent for the spinning dope, the coagulation bath condition is preferably an aqueous solution of 40 to 65% by weight of dimethylformamide and a temperature of 30 ° C. or less. The spun fiber is usually subjected to primary stretching of about 1 to 8 times in several baths where the concentration of organic solvent is lowered, followed by washing with water and application of pre-oil. Then 100
Drying and densification is performed by hot air or hot roller at ˜180 ° C. or by using hot air and hot roller together. Before or after drying, secondary stretching or shrinkage may be performed to adjust the physical properties of the fiber. After that, application of post oil, application of mechanical crimp, wet heat treatment, etc. may be performed.

The processing conditions of the fiber of the present invention are not particularly limited, and dyeing can be carried out in the same manner as ordinary flame-retardant acrylic synthetic fibers, but the pigments, dyes and auxiliaries used are light-resistant. It is desirable to use a good one.

[0017]

EXAMPLES Next, the present invention will be specifically described by showing examples. Parts and% in the examples are parts by weight and% by weight, unless otherwise specified. The evaluation of light resistance was carried out by spinning the obtained flame-retardant acrylic synthetic fiber into a No. 30 single yarn and then circular knitting, exposing it at 63 ° C. for 100 hours and 200 hours in a fade meter. The evaluation was performed by the discoloration and fading (gray scale).

Examples 1-6 and Comparative Examples 1-3 Acrylonitrile (AN) / vinylidene chloride (VC)
1 ₂ ) / 2-acrylamido-2-methylpropanesulfonic acid sodium (SAM) = 58/40/2 polymer dimethylformamide (hereinafter abbreviated as DMF) solution was prepared as a spinning stock solution. In addition, 2- (2'-hydroxy-5'-methacryloxyethylphenyl) -2
H-benzotriazole (hereinafter abbreviated as HMB) is 5
A 30% DMF solution of a copolymer of 0% and 50% methyl methacrylate and having a polystyrene reduced molecular weight of 10,000 was prepared. This mixture was added to the above spinning dope in the amounts shown in Table 1 and mixed, spun into a 60% DMF aqueous solution, washed with water, added with a fiber oil agent, and dried and densified at 140 ° C. using a roller dryer. It was Next, a mechanical crimp is applied and moist heat 1
The crimp was set at 10 ° C. The obtained fiber was cut and spun, and then a circular knit fabric was produced and evaluated for the above light resistance test. The results are shown in Table 1.

[0019]

[Table 1] The heat resistance of the product obtained in Comparative Example 3 was poor, and the fibers showed sticking and coloring.

As is clear from Table 1, the product of the example has excellent light resistance as compared with the product of the comparative example.
In addition, when I did a dyeing test, no problems occurred during dyeing,
The obtained product also showed no significant difference in dyeability and transparency from ordinary acrylic synthetic fibers.

[0021]

EFFECTS OF THE INVENTION The flame-retardant acrylic synthetic fiber of the present invention is excellent in light resistance and has ordinary dyeability, operability, etc., and thus is extremely useful. Further, the fiber obtained in the present invention is a usual acrylic synthetic fiber, polyester, nylon, cotton,
It can be used by mixing it with other fibers such as rayon and wool, and can be used for carpets, curtains and the like that require light resistance, which is extremely useful industrially.

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Claims (1)

[Claims] 1. An acrylonitrile-based polymer containing vinyl chloride and / or vinylidene chloride, and a general formula: And a molecular weight of 20 containing 20 to 60% by weight of the monomer
Content of the monomer is 0.1 to 3% by weight with respect to the acrylonitrile polymer.
A flame-retardant acrylic synthetic fiber with excellent light resistance, which is polyblended so that