Fabric for air-bag, using polyethylene terephthalate with excellent heat resistance

Abstract

Provided is a fabric for an airbag using a polyethylene terephthalate fiber, and particularly, to a fabric for an airbag having enhanced thermal resistance and instantaneous thermal strain rate, which is manufactured using a polyethylene terephthalate fiber for an airbag manufactured by controlling the strength and elongation of the polyethylene terephthalate fiber to replace a conventional fabric for an airbag using a yarn formed of nylon 66. The fabric for an airbag including a polyethylene terephthalate fiber manufactured by spinning a polyethylene terephthalate chip having an intrinsic viscosity of 0.8 to 1.3 dl/g has thermal resistances of 0.45 to 0.65 seconds at 450° C., and 0.75 to 1.0 seconds at 350° C.

Description

TECHNICAL FIELD[0001]The present invention relates to a fabric for an airbag using a polyethylene terephthalate fiber, and particularly, to a fabric for an airbag having enhanced thermal resistance and instantaneous thermal strain rate, which is manufactured using a polyethylene terephthalate fiber for an airbag manufactured by controlling the strength and elongation of the polyethylene terephthalate fiber to replace a conventional fabric for an airbag using a yarn formed of nylon 66.BACKGROUND ART[0002]An airbag requires characteristics of low air permeability to easily rupture in a car crash, and energy absorbability to prevent damage to and bursting of the airbag itself. In addition, to be more easily stored, characteristics relating to foldability of a fabric itself are required. As a suitable fiber having the above-described characteristics, nylon 66 has generally been used. However, recently, in order to save on cost, attention on fibers other than nylon 66 has been increasing...

AI Technical Summary

Benefits of technology

[0012]The present invention provides a polyethylene terephthalate fabric for an airbag, which overcomes the lack of flexibility, which is a disadvantage of a conventional fabric for an airbag, and has better thermal resistance. As a result, an airbag module manufactured using the fabric for an airbag can be more easily stored and rarely bursts due to pressure and heat instantaneously applied by a high temperature expanding gas during airbag development tests.

[0013]The present invention provides a polyethylene terephthalate fabric for an airbag manufactured by manufacturing a polyethylene terephthalate fiber for an airbag by controlling the strength and elongation of the polyethylene terephthalate fiber, thereby obtaining excellent thermal resistance and instantaneous thermal strain rate. Accordingly, outer seams rupture less frequently during airbag cushion development tests, and the foldability and storability of the fabric for an airbag are improved.

[0014]In the present invention, the fabric for an airbag uses a polyethylene terephthalate multifilament obtained by spinning a polyethylene terephthalate chip having an intrinsic viscosity (IV) of 0.8 to 1.3 dl/g to safely absorb instantaneous impact energy of an exhausted gas generated due to explosion of gunpowder in the airbag. A polyester yarn having an intrinsic viscosity (IV) of less than 0.8 dl/g is not suitable because the polyester yarn does not have sufficient toughness to be used as an airbag.

[0015]A resin for producing a synthetic fiber multifilament for an airbag may be selected from the group

Problems solved by technology

However, when polyethylene terephthalate is used as a yarn fo