国产亚洲精品视频在緌看,国产色爽女视频免费不卡,国色天香社区视频手机免费,超国产人碰人摸人爱视频,亚洲性爱 桃色 第一页,亚洲波多野结衣日韩在线,亚洲高清一区二区三区电影,成人啪精品视频免费网站,久久精品久久电影免费,亚洲不卡在线无码视频

ABS plastic is a copolymer of acrylonitrile (A), butadiene (B) and styrene (S). Among them, butadiene has unreacted double bonds. Especially under the influence of external factors such as light, heat and oxygen, the unsaturated double bonds cause the weather resistance of ABS to be greatly affected, and it is easy to turn yellow and become brittle.

The main influencing factors of product color yellowing (b value) are base material, auxiliary agent, process and toner. Through the unique formula design and special process, the reduction speed of the butadiene double bond was successfully controlled, and the yellowing of the toner was reduced. The weather-resistant ABS was successfully developed, which has been successfully applied in the sanitary ware industry.