JPH01168950A - Flame-retardant antistatic acrylic fiber nonwoven fabric - Google Patents

Abstract

PURPOSE:To obtain the titled nonwoven fabric outstanding in fouling-proofness against airborne oily stain such as cigarette smoke, thus suitable for interior decoration, wall materials, etc., by heat fusion of a specific flame-retardant antistatic acrylic fiber with a heat-fusible fiber into a unity. CONSTITUTION:A copolymerization is carried out between (A) 80-50wt.% of acrylonitrile, (B) 20-50wt.% of a halogen-contg. vinyl monomer (e.g., vinyl chloride) and (C) 0-20wt.% of a vinyl monomer copolymerizable with the components A and B (e.g., allylsulfonic acid) followed by spiking with (D) 0.5-5wt.% of antimony pentoxide as the flame-retarding aid and electrically conductive metal such as copper to decrease electrical resistance to produce a flame-retardant antistatic acrylic fiber with an electrical resistance of <=1X10<8>OMEGA.cm. This acrylic fiber is put to heat fusion with (E) 1-50wt.% based on the whole nonwoven fabric, of a heat-fusible fiber such as polyester fiber to effect mutual bonding, thus obtaining the objective nonwoven fabric.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a nonwoven fabric made of acrylic fibers, and more particularly to a nonwoven fabric made of acrylic fibers that is flame retardant and antistatic.

[Conventional technology]

Nonwoven fabrics made of acrylic fibers are used for various purposes, taking advantage of the flexibility, good texture, bulkiness, and excellent dyeability of the fibers themselves. In the clothing field, further quantitative expansion is expected in the future by taking advantage of the above characteristics. On the other hand, recently, applications other than clothing, for example, as a building material and as an indoor wall material, are attracting attention.

Fibers used in this field of application are required to have a high degree of flame retardancy from the viewpoint of preventing sudden fire hazards.

Acrylic fibers having high flame retardancy are known, for example, from Japanese Patent Application Laid-Open No. 59-204648. Recently, consumer needs have become more sophisticated and diverse, and the reality is that conventional textile materials cannot adequately meet these demands. One of the recent diversified demands is for wall materials that are resistant to staining. In particular, cigarette smoke stains other than dirt and dust are brown in color and oily, so
It is a stain that impairs the beauty and is difficult to remove. In order to give wall materials stain-resistant properties, it is conceivable to use a wall material form such as a vinyl sheet that can easily wipe away adhered dirt with a damp cloth or the like.

However, if the wall material is in the form of a paper-like material made of fibers, non-woven fabric, or woven fabric, wiping it with a rag risks significantly damaging its shape.
It is difficult to remove dirt easily.

[Problem that the invention seeks to solve]

The object of the present invention is to provide a fiber nonwoven fabric suitable for wall materials, which is flame retardant and stain resistant, particularly resistant to stains caused by cigarette smoke.

[Means for solving problems]

The purpose of the present invention is to obtain 80 to 50% by weight of acrylonitrile (
(Hereinafter, unless otherwise specified, weight S means weight S.) A copolymer composed of 20 to 50 chlorine-containing vinyl monomers and 0 to 20 chlorine vinyl monomers copolymerizable with them, and the copolymer It is composed of antimony pentoxide as a flame retardant additive in O, S to s% of the coalescence, and the electrical resistance value is I.
A flame-retardant anti-static acrylic fiber with a resistance of X 10Ω or less and a heat-fusible fiber. Achieved by anti-flame acrylic fiber non-woven fabric.

The flame-retardant and antistatic acrylic Rm of the present invention (hereinafter referred to as the fiber of the present invention) uses a polymer obtained by copolymerizing a halogen-containing vinyl monomer with acrylonitrile as the main material forming the fiber. The reason why a halogen-containing monomer is used as one of the copolymerization components is because the monomer! - to copolymerize K
This is to give the fiber more flame retardant properties. Specific examples of monomers for this purpose include monomers having hydrogen, such as vinyl chloride, vinyl bromide, vinylidene chloride, and vinylidene bromide, and the copolymerization ratio thereof must be 20 to 50. If the content of the monomer is less than 20 ts, the flame retardance of the resulting fiber will be insufficient, while if it exceeds 5 ts, the characteristic properties of acrylic fibers, such as dyeability and transparency, will be lost, which is not preferable. It may further contain 0 to 20 other vinyl monomers in a copolymerized form;
Vinyl monomers with sulfonic acid groups to improve dyeability, such as allylsulfonic acid, methallylsulfonic acid, and styrene sulfonic acid; monomers to improve physical properties, such as methyl or ethyl esters of acrylic acid and methacrylic acid; , vinyl acetate, etc.

The fiber of the present invention is the above-mentioned copolymer IC! i! Add antimony pentoxide as a flame retardant aid to the copolymer in an amount of 0.5~
It includes 5 proboscises. This antimony pentoxide has the function of imparting a higher degree of flame retardancy to the fibers and at the same time exhibiting a stain-preventing effect against cigarette smoke by interacting with the antistatic performance of the fibers. Furthermore, a zirconium compound can be used in combination with antimony pentoxide, and in this case the flame retardant performance is greatly improved. This is very preferable from the standpoint of disaster prevention when the fiber is used as interior material for a room.

If the proportion of antimony pentoxide to the copolymer is less than 0.5%, the flame retardancy will not be improved, and if it is more than 5%, the transparency of the fibers and the sharpness of the dyeing will deteriorate. In addition, if the zirconium compound used in combination with antimony pentoxide is 0.05 or more relative to the copolymer, the effect of improving flame retardancy is recognized, and if the zirconium compound is used in a total ratio of 5 or less with antimony pentoxide, is preferable in terms of fiber transparency and dyeing clarity.

Specific examples of the zirconium compounds include zirconium silicate, zirconium oxychloride, zirconium oxide, zirconium hydroxide, zirconium sulfate, sodium zirconyl sulfate, acidic zirconyl sulfate trihydrate,
Examples include zirconium carbonate.

The fibers constituting the nonwoven fabric of the present invention must also have an electrical resistance value of 1 x Io''Ω・country wind as an antistatic property. This property is necessary to remove dirt caused by cigarette smoke floating in the air, and the above-mentioned dirt prevention effect is excellent in the wind of lXl0'Ω.It is not clear why this property is developed. This is thought to be due to electrical repulsion with the oily dirt components contained in cigarette smoke.The electric resistance value of the fiber is I x 10
The method of reducing the resistance to Ω・G or less is by attaching an antistatic oil to the fibers made of the polymer composition, by mixing an antistatic substance into the polymer, or by using a copolymerization agent to control the static electricity. There is a method of copolymerizing monomers that can impart electrical properties.

As the above-mentioned antistatic oil, commonly used nonionic, anionic, or cationic antistatic oils can be used, and antistatic substances used by mixing with the polymer include conductive carbon black, oxidized Examples include conductive metal compounds such as tin, conductive gold scraps such as copper and zinc, and antistatic polymers such as polyalkylene glycol (meth)acrylate polymers or copolymers. Further, as an antistatic material to be used as a copolymerization monomer of the above-mentioned polymer, there is the above-mentioned polyalkylene glycol (meth)acrylate. In this case, it is necessary to copolymerize the copolymer in an amount of 20 or less in the polymer; if the amount exceeds this amount, the physical properties of the resulting fibers will deteriorate, so it is not preferable.

Next, the heat-melting fibers constituting the nonwoven fabric of the present invention are fibers having the property of being melted by heating, such as polyester-based, polyolefin-based, polyvinyl chloride-based, and polyvinylidene chloride-based fibers.

It is preferable that these thermofusible fibers are contained in the total nonwoven fabric in an amount of 1 to 50%, preferably 5 to 20%.
If it is less than 50 cm, the adhesive strength due to the melting of the fibers will be insufficient, while if it exceeds 50 cm, the nonwoven fabric will become hard and have a plate-like appearance and texture, and the soft characteristics of the fiber material will be lost. So I don't like it.

The nonwoven fabric of the present invention is a nonwoven fabric in which hot-melt fibers are melted and adhered to the fibers of the present invention, and the fibers are bonded together as a whole, and the stain resistance provided by the properties of the constituent fibers, especially for tobacco. It has excellent stain resistance against oil-based stains caused by smoke, and can be used in areas that take advantage of its properties, such as interior decoration and wall materials.

Next, a method for manufacturing the nonwoven fabric of the present invention will be described.

The nonwoven fabric of the present invention can be produced by a conventionally known dry method or wet method.

In the case of manufacturing by a wet method, the fibers of the present invention and heat-fusible fibers are cut into short fibers, the side fibers are dispersed in water and mixed thoroughly, and then a sheet-shaped product is made by papermaking, and after drying. At the temperature at which the heat-melting fibers melt, the sheet-like material is processed by being narrowed from above and below, or by being placed on a conveyor belt. The cut length of the side fibers is, for example, l■~100■,
It is determined as appropriate depending on the form of the nonwoven fabric to be obtained. It is possible to obtain a seed paper-like nonwoven fabric with a short cut length, and a cloth-like nonwoven fabric that becomes bulkier as the cut length becomes longer. The mixing ratio of the side fibers is 1 to 50%, preferably 5 to 20%, of heat-fusible fibers, and the higher the ratio of these fibers, the harder the nonwoven fabric will be. Further, the heat treatment temperature is such that the temperature of the gas atmosphere is 90 to 300°C, preferably 120 to 200°C, and the optimum temperature varies somewhat depending on the type of fiber.

Next, in the case of a dry method, the above-mentioned double-through fibers are mixed to form a sliver-like material in the spinning process, and then heat-treated in the same manner as described above to obtain the nonwoven fabric of the present invention from K. Also,
The nonwoven fabric of the present invention can be obtained by separately forming the side fibers into a sheet-like material, stacking them on top of each other, subjecting them to a treatment such as needle punching or columnar flow punching, intertwining the side fibers, and then heat-treating them.

<Example> Below, the nonwoven fabric of the present invention will be explained with reference to Examples.

Example 1 Acrylonitrile 52.3%, vinylidene chloride 47%,
2% by weight of antimony pentoxide based on the copolymer was added to a copolymer containing 0.7% methallylsulfonic acid, and this was dissolved in dimethylformamide (hereinafter referred to as DMF).
The fibers were spun in an aqueous solution containing sob, washed with water, stretched in hot water, coated with 1% of an oil agent containing a lauryl alcohol ethylene oxide adduct as a main component, and dried to obtain 3D fibers.

This fiber was highly flame retardant (Lo 133 ) and had an electrical resistance of 1×1080.

This fiber was cut into t-50m lengths, mixed with polypropylene fibers (cut length 35m, 3d) at 10% based on the total fibers, dispersed in water, thoroughly mixed, and then subjected to a papermaking method to obtain a sheet-like product. . After drying, this was treated in air at 160°C to obtain a nonwoven fabric.In order to measure the stain resistance of this nonwoven fabric, this nonwoven fabric was pasted on the wall of a room where cigarette smoke was generated.
I did a test for a month. No change in color was observed by visual inspection, but commercially available acrylic fibers (AN9
3%, methyl acrylate a, s%, sodium methallylsulfonate 0.5 copolymer, electrical resistance I x 1
The nonwoven fabric produced in the same manner as above using 0'Ω·cIrl) was clearly colored.

Furthermore, the nonwoven fabric of the present invention has a high degree of flame retardancy and is found to be suitable for interior decoration applications.

Example 2 To the copolymer used in Example 1, 1% antimony pentoxide, zirconium oxide O, OSS, and 5% tin oxide as a conductive substance were added, and fibers were produced in the same manner as in Example 1, and a nonwoven fabric was produced. was manufactured. The flame retardance of this fiber was LO 125 and the electrical resistance was 1 x Io'Ω. Regarding the antifouling property of the nonwoven fabric, according to Test) K of Example 1, no change in color was observed. On the other hand, fibers obtained in exactly the same manner except without the addition of tin oxide had an LO of 125 and an electrical resistance of 1 x 1011 Ω・Tan, and the nonwoven fabric made from this had clear coloration due to dirt in a similar test. It was done.

Moreover, the nonwoven fabric of the present invention had a high degree of flame retardancy.

〔Effect of the invention〕

The nonwoven fabric of the present invention is highly flame retardant and at the same time stain-resistant.
In particular, it has excellent stain resistance against oily stains floating in the air such as cigarette smoke.

Because of this property, it is highly suitable for interior decoration, such as wall materials and curtains.

Patent applicant: Asahi Kasei Industries, Ltd.

Claims (1)

[Claims] A copolymer composed of 80 to 50% by weight of acrylonitrile, 20 to 50% by weight of a halogen-containing vinyl monomer, and 0 to 20% by weight of a vinyl monomer copolymerizable with these; It consists of ~5% by weight of antimony pentoxide as a flame retardant aid, and consists of flame-retardant and antistatic acrylic fibers with an electrical resistance value of 1 x 10^8 Ω cm or less, and heat-fusible fibers, A flame-retardant and antistatic acrylic fiber, characterized in that the flame-retardant and antistatic acrylic fiber is integrally bonded by melting the heat-melting fiber and fusing it with the flame-retardant and antistatic acrylic fiber. fiber nonwoven