在海盐生产中,在雨天用聚氯乙烯薄膜苫盖结晶池,是海盐增产的一项重要新技术。它能防止雨水冲淡盐卤,变季节生产为常年生产,通常可增产海盐20—3O％。但由于薄膜易老化,一般只能用一年多的时间,因而影响了推广应用。化工部合成材料老化研究所与广东省制盐研究所以及广东徐闻盐场、海康盐场等单位, In the production of sea salt, it is an important new technology to increase the production of sea salt by covering the crystal pond with polyvinyl chloride film in rainy days. It can prevent salt water brine dilute, change the production for the perennial season, usually can increase sea salt 20-3O%. However, due to the aging of the film, generally only use more than a year, thus affecting the promotion and application. Department of Chemical Materials, Institute of aging synthetic materials and Guangdong Institute of Salt and Salt Xucheng, Guangdong, Hankook saltworks and other units,