AIRBAG BASE FABRIC COATING MATERIAL, AIRBAG BASE FABRIC, AND METHOD FOR MANUFACTURING THE SAME

摘要

A polyvinyl alcohol (PVA)-based airbag base fabric aqueous coating material is provided. Blocked polyisocyanate component (B-NCO) and liquid polyol are added, respectively, as a cross-linkage improver and a plasticizer. The B-NCO is composed of or based on a medium-molecular-weight form as a polyether-modified prepolymer, used concurrently with a low-molecular-weight form in a small amount.;The base fabric coating material is applied on one or both of the sides of a cloth of the base fabric, and heated.;Thus the acquired coating film is a water-insoluble coat and the coat shows excellent heat and moisture resistance (hot water resistance) and flexibility.

主权项

1. A polyvinyl alcohol (PVA)-based airbag base fabric aqueous coating material, wherein
blocked polyisocyanate component (hereinafter abbreviated to “B-NCO”) and liquid polyol are added, respectively, as a cross-linkage improver and a plasticizer, and wherein the B-NCO is composed of or based on a medium-molecular-weight form as a polyether-modified prepolymer, and wherein the additive amount of the B-NCO to the PVA is such that the leaching rate in the following hot water immersion test is 10% or lower and the breaking extension (EB) (ASTM D638) is 100% or more, “hot water immersion test: a to-be-tested coating material is applied onto a glass plate at a dry film thickness of 100 μm and then heated under a condition of 170 degrees C. and 300 seconds, and the coating film is torn off from the glass plate to prepare a rectangular test piece (50-mm square), which rectangular test piece is then immersed in hot water at 80 degrees C. to measure the leaching rate after 30 minutes according to JIS K7209.”