Liquid Polymers as Coatings for Improved Coated Fabrics. Supplement
ARMY WEAPONS COMMAND ROCK ISLAND IL GENERAL THOMAS J RODMAN LAB
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Results are presented concerning the use of liquid polymers as coatings for fibrous and nonfibrous substrates to provide improved weapon accessories such as gun covers and cleaning kit packets. Both pigmented and nonpigmented coatings were investigated. Application of solvent-diluted polymer coatings to woven substrates caused a significant loss in cross-direction breaking strength. Base or tie coats consisting of liquid diamines applied to the substrate prior to application of liquid polymers did not significantly improve the tear strength of the coated fabrics made from either woven or nonwoven substrates. Except for the Estane solution coating, the polyurethane liquid polymers were generally resistant to a hydrocarbon fuel, lubricating oil, and insect repellent. Six months open sunlight aging in Panama was generally more severe than rain forest aging on both the pigmented and nonpigmented coated fabrics. The best combination of breaking and tear strength and resistance to accelerated aging was obtained with either a pigmented or nonpigmented liquid polyurethane coated on a BetaglassDynel substrate. These experimental materials had abrasion resistance equal to or better than that of the vinyl control and two to three times better than that of the neoprene control. The black pigmented material suffered little or no loss in tear strength after accelerated aging while the control materials lost 10 to 20 percent in tear strength.
- Coatings, Colorants and Finishes