JPH11115663A - Air bag base cloth and air bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an electric shock by a static electricity when an occupant makes contact with an expanded and developed air bag by specifying the frictional electrified pressure of an air bag base cloth. SOLUTION: An air bag base cloth whose frictional electrified pressure is 1500 V, favorably 1000 V, further favorably below 500 V when it is measured by a method regulated by JIS L 1094 and in the atmosphere of a temperature 20 deg.C and humidity 30% RH is used. When a human body comes into contact in the case beyond 1500 V, an electric shock is often felt. A method for making the frictional electrified pressure below 1500 V is not specified, but for example the method for blending a compound having an electricity restrain performance in a fiber and for covering a fiber surface by the compound having the electricity restrain performance is picked up. A natural fiber such as a wool, cotton and silk excellent in the electricity restrain performance may be mixed to nylon or polyester fiber by a necessary amount.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag base fabric having antistatic performance. Further, the present invention relates to an airbag fabric and an airbag excellent in safety for preventing electric shock caused by static electricity when an occupant comes into contact with an inflated and deployed airbag by operating an inflator.

[0002]

2. Description of the Related Art In recent years, various airbags have been developed in order to ensure the safety of occupants in the event of an accident of various transportation means, especially automobiles. I'm advancing. Normally, an airbag is made by sewing a fabric having improved heat resistance, flame retardancy, gas (air) barrier properties, and the like. The airbag is folded and stored on the steering wheel and instrument panel until immediately before activation, and when a car accident such as a collision occurs, gas is injected from the inflator and the airbag inflates and deploys rapidly, causing the occupant's face to expand. And to protect them.
When the gas injected from the inflator comes into contact with or passes through the airbag base fabric, the base fabric is charged with static electricity, and when the occupant comes into contact with the occupant, a large electric shock may be caused by the static electricity.

[0003] At present, there is no proposal for an airbag base fabric and an airbag taking measures against static electricity.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an airbag excellent in preventing static electric shock caused by an inflated and deployed airbag without impairing the mechanical and chemical properties of the airbag. Things.

[0005]

The present invention adopts the following means to solve the above-mentioned problems.
That is, the airbag fabric of the present invention has a
The frictional band voltage is 1500 V or less as measured by a method specified in JIS L 1094 in an atmosphere of% RH.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to an airbag base fabric for protecting an occupant from an electric shock caused when the occupant comes into contact with the airbag when the airbag base fabric carries a large amount of static electricity when the airbag is inflated and deployed. After careful examination,
It has been clarified that the electric shock can be prevented brilliantly by reducing the friction band voltage of the base cloth.

[0007] The airbag base fabric of the present invention is a film alone, a fiber fabric alone, or a laminate of these. A fiber fabric is preferred in terms of physical strength. The fiber yarn of the present invention is composed of one or more of synthetic fibers, semi-synthetic fibers, and natural fibers, and is composed of long fibers and short fibers. Any may be used.

The fiber material of the present invention is, for example, nylon 6,
Nylon 66, Nylon 46, Nylon 12, a copolymer or blend of Nylon 6 and Nylon 66, or a polyamide fiber such as polyalkylene glycol, dicarboxylic acid or amine copolymer, polyethylene phthalate, polybutylene phthalate, Also, polyester fibers obtained by copolymerizing isophthalic acid, 5-sodium sulfoisophthalic acid, adipic acid, etc., aramid fibers such as paraphenylene terephthalamide, and copolymers with aromatic ethers, wholly aromatic polyester fibers, and vinyl chloride fibers Fibers, vinylon fibers, rayon fibers, olefin fibers such as polyethylene and polypropylene, sulfone fibers, carbon fibers, ceramic fibers, metal fibers, wool, silk, cotton, etc. These may be used alone or in combination of two or more. Even There. Such fibers may contain various additives commonly used for improving productivity and characteristics in the production and processing steps of the raw yarn. For example, a heat stabilizer, an antioxidant, a light stabilizer, a flame retardant, a plasticizer, a thickener, a coloring agent, a leveling agent, an antibacterial agent, an antifungal agent and the like can be contained.

In the present invention, it is preferable to use polyamide fibers or polyester fibers in view of the strength of yarn, durability against temperature and humidity, cost, etc. When such fibers are used, the total fineness is 100%. ~ 500 denier, single yarn fineness 0.1 ~ 10 denier, yarn strength 5g
/ Denier or more is better.

The base fabric of the present invention is made of a woven fabric, a knitted fabric, a non-woven fabric, etc., and these may be used alone or two or more kinds may be laminated. It is preferable to use a woven fabric in view of the mechanical properties of the base fabric.
In the range of inches, the cover factor calculated from the fineness and the woven fabric density is from 1,000 to 3,000, preferably from 1,500 to 2,500 from the viewpoint of non-breathability, that is, airtightness and flexibility. Here, the cover factor is the total warp fineness D1 and the warp density N1,
If weft total fineness D2 and weft density N2, then D1 ^1/2 × N
1 + D2 ^1/2 × N2. As a loom for weaving the woven fabric, a water jet loom and an air jet loom are preferred. In producing such a base fabric, a light stabilizer, a flame retardant, a water absorbing agent, a moisture absorbing / releasing agent, an antibacterial agent, an antifungal agent and the like may be applied to improve processability and characteristics.

The air permeability of the base fabric of the present invention is determined according to JIS L1.
096 A, preferably 1 cc / cm ²
/ Sec or less, more preferably 0.5 cc / cm
² / sec or less. If it exceeds 1 cc / cm ² / sec, the inflating and expanding properties are not smooth, which may hinder the protection of the occupant.

The weight of the base fabric of the present invention is preferably 500
g / m ² or less, and the thickness is 1 mm or less, and from the viewpoint of storability, more preferably 250 g / m ² or less and the thickness is 0.5 mm or less.

The present invention may be either a non-coated base fabric which uses a fabric made of the above fibers as it is, or a coated base fabric which coats at least one surface of such a fabric with various resins.

The base fabric for an airbag of the present invention is JIS L
Temperature 20 ° C, humidity 30
% RH when measured in an atmosphere of% RH
V or lower, preferably 1000 V or lower, more preferably 500 V or lower. 1
If the voltage exceeds 500 V, an electric shock may be felt when the human body comes into contact.

In the present invention, the method for setting the frictional band voltage to 1500 V or less can employ a method usually used for imparting antistatic performance, and is not particularly limited. For example, it is possible to use a method of blending a compound having an antistatic property into the fiber or coating the fiber surface with a compound having an antistatic property. In addition, natural fibers such as wool, cotton, and silk having excellent antistatic performance may be mixed with nylon or polyester fibers in an amount necessary for achieving the effects of the present invention.

The method of blending a compound having an antistatic property into the fiber of the present invention includes a method of producing an antistatic compound such as polyethylene glycol, polypropylene glycol or a copolymer of polyethylene glycol and a third component. Alternatively, a generally used method of blending with a chip to form a thread before yarn prevention can be employed as it is.

As the method of coating the fiber surface with the compound having antistatic performance of the present invention, the usual antistatic processing of a fiber cloth can be used as it is, and the processing is performed by using a non-drawing process at the yarn-making stage. The treatment may be performed after attaching to the yarn or drawn yarn to form a fabric, or after forming the fabric. For example, nonionic, cationic, anionic, a base cloth is immersed in a solution comprising at least one surfactant selected from amphoteric surfactants, and squeezed with a mangle or the like so as to have a desired adhesion amount. It is dried at 80 to 150 ° C and heat-treated at a temperature of 160 to 180 ° C as needed. In addition, a solution obtained by mixing a catalyst with a vinyl monomer solution containing a polyethylene glycol component, if necessary, is applied to the fiber surface, and the fiber surface is controlled by dry heat treatment, wet heat treatment such as steam, electron beam irradiation, ultraviolet irradiation, or the like. A polymer having electrical performance may be formed. A light stabilizer, a flame retardant, a water-absorbing agent, a moisture-absorbing / dehumidifying agent, an antibacterial agent, an antifungal agent, a resin, and the like can be mixed with the antistatic processing solution to improve processability and characteristics.

[0018]

The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto.

The performance values shown in Examples and Comparative Examples were measured by the following methods.

[Friction charge voltage] Measured according to the method specified in JIS-L-1094 at a temperature of 20 ° C. and a humidity of 30% RH.

[Air permeability] Measured according to the JIS-L-1096 A method (Fragile tester).

[Rigidity] JIS-L-1096, 6.1
The value in the warp direction was measured by the 9.1A method (45-degree cantilever method).

[Storability] A 60-liter airbag bag was folded into a predetermined shape, and the bulk when pressed at 98 N was measured and shown as a relative value.

[Tensile strength, elongation] JIS-L-109
The value in the warp direction was determined at 6, 6.12.1A.

[Tear strength] JIS-L-1096, 6.
The value in the warp direction was obtained at 15.4C.

Examples 1 to 8, Comparative Example 1 Total fineness 420 denier, 72 filaments, strength 9.5
g / denier, elongation 23.9% nylon 66 fiber filament yarn (manufactured by Toray Industries, Inc.) used for warp and weft,
On a water jet loom, weave a plain weave having a warp and weft density of 54 yarns / inch and a standard weave of 8.
After scouring at 0 ° C., drying at 140 ° C., and heat setting at 180 ° C., a woven fabric having a warp and weft density of 55 / inch was obtained (cover factor 2254). The woven fabric was immersed in a solution in which the concentration of the aqueous solution of the antistatic agent shown below was changed, squeezed with a mangle so that the amount of the aqueous solution attached became 40%, dried at 130 ° C, and heat-set at 160 ° C with a pin tenter. Table 1 shows the results of evaluating the performance of the woven fabric. As a comparative example, one not treated with the compound solution was used. The storage property of the airbag body was determined as a relative value with the comparative example taken as 100.

(Antistatic agent a) Daytron N (anionic compound manufactured by Nikka Chemical Co., Ltd.) (Antistatic agent b) Nicepole FE22 (nonionic compound manufactured by Nikka Chemical Co., Ltd.)

[Table 1] From Table 1, it can be seen that Examples 1 to 8 are base fabrics capable of improving the triboelectric charging performance and reducing the electric shock without lowering the physical performance of the woven fabric.

Example 9, Comparative Example 2 Total fineness: 315 denier, 72 filaments, strength: 9.5
The yarn density of both warp and weft yarns is 62 yarn / filament using a water jet loom using filament yarn (manufactured by Toray Industries, Inc.) made of nylon 66 fiber having a g / d of 23%.
An inch plain weave was woven. The fabric is nice pole FE
-26 (Nonionic compound manufactured by Nichika Chemical Co., Ltd.) 2%
It was immersed in an aqueous solution and squeezed by a mangle so as to obtain an adhesion amount of 30%, dried at 130 ° C, and pin-tenter set at 180 ° C to obtain a woven fabric having a warp and weft density of 63 yarns / inch (cover factor 2236). ).

Table 2 shows the results of evaluating the performance of a comparative example which was similarly treated without using an antistatic agent.

[0030]

[Table 2] From Table 2, it can be seen that Example 9 can improve the triboelectric charging performance without deteriorating the physical performance of the fabric.

Example 10, Comparative Example 3 Total fineness 420 denier, 144 filaments, strength 9.
Using a filament yarn (manufactured by Toray Industries, Inc.) made of polyethylene terephthalate having an elongation of 3 g / d and a warp weaving loom, weaving a plain woven fabric having a warp and weft density of 54 yarns / inch, 95 by law
After scouring at 150 ° C., drying at 150 ° C., and heat setting at 180 ° C., a woven fabric having a warp and weft density of 55 / inch was obtained (cover factor 2254). The woven fabric was treated in the same manner as in Example 9, and the performance was evaluated. The results are shown in Table 3.

[0032]

[Table 3] From Table 3, it can be seen that the product of Example 10 can improve the triboelectric charging performance without lowering the physical performance of the fabric.

[0033]

According to the present invention, the strength of the airbag base fabric is maintained, the airbag is excellent in air permeability, flexibility and storage properties. When an occupant comes into contact with the inflated and deployed airbag, an electric shock caused by static electricity is provided. It is possible to provide an airbag base fabric and an airbag which prevent the occurrence of the airbag. Further, the airbag base fabric according to the present invention is excellent in antistatic performance, and therefore, is less susceptible to static electricity during the cutting and sewing work of the airbag, so that it is excellent in workability.

Claims (13)

[Claims] 1. JIS in an atmosphere of 20 ° C. and 30% RH
A base fabric for an airbag, wherein the friction band voltage measured by the method specified in L 1094 is 1500 V or less. 2. The airbag base fabric according to claim 1, wherein the base fabric is made of a fiber material. 3. The base fabric for an airbag according to claim 2, wherein the base fabric has been subjected to a treatment so that a friction band voltage measured by a method specified in JIS L 1094 becomes 1500 V or less. 4. The airbag base fabric according to claim 1, wherein said base fabric has an air permeability of 1 cc / cm ² / sec or less as measured by JIS-L-1096A method. 5. The airbag base fabric according to claim 1, wherein said base fabric is a woven fabric. 6. The airbag base fabric according to claim 5, wherein the woven fabric has a cover factor of 1500 to 2500. 7. The airbag base fabric according to claim 5, wherein the woven fabric is formed of a yarn having a total fineness of 100 to 500 denier. 8. The woven fabric is made of fibers having a single yarn fineness of 0.1 to 10 denier.
An airbag base fabric according to any one of claims 1 to 7. 9. The fabric according to claim 5, wherein the fabric has a weight of 500 g / m ² or less and a thickness of 1 mm or less.
The airbag base fabric according to any one of the above. 10. The base fabric according to claim 1, wherein the base fabric is composed of a fiber containing a compound having antistatic performance.
5. The base fabric for an airbag according to any one of 5. 11. The airbag base fabric according to claim 1, wherein said base fabric is made of fibers coated with a compound having antistatic performance. 12. The base fabric is a fiber containing a compound having an antistatic property, and the fiber surface is made of a fiber coated with a compound having an antistatic property. A base fabric for an airbag according to any one of claims 1 to 5. 13. An airbag, comprising the airbag base fabric according to claim 1. Description: