氯乙烯-丙烯酸丁酯共聚树脂的性能优化及应用

通过调整生产工艺或聚合配方,对氯乙烯-丙烯酸丁酯共聚树脂(以下简称氯丙树脂)中丙烯酸丁酯的含量及分布,氯丙树脂的分子质量及其分布、颗粒特性、热稳定性进行了优化;比较了优化后的氯丙树脂与普通PVC树脂的加工性能和力学性能,并将其应用于PVC型材和注塑管件的生产。结果表明:①氯丙树脂中丙烯酸丁酯的质量分数以5%～10%为宜;②通过调整生产工艺或聚合配方,可制得丙烯酸丁酯分布均匀、分子质量分布集中、粒度分布集中、热稳定性优良的氯丙树脂;③氯丙树脂可提高PVC树脂的加工性能和力学性能,可部分替代ACR或CPE等助剂;④经氯丙树脂改性生产的PVC型材和注塑管件性能合格,可简化注塑生产工艺,提高碳酸钙的用量,从而降低产品成本。

Performance optimization and applieation of vinyl chloride-butyl acrylate copolymer resin

Through adjusting production process and polymerization formula, the content and distribution of butyl acrylate in vinyl chloride-butyl acrylate copolymer resin were optimized as well as the copolymer resin＇s molecular mass, molecular mass distribution, particle characteristics and heat stability. Vinyl chloride-butyl acrylate copolymer resins were compared with common PVC resins in processing and mechanical performances, and were applied to the production of PVC profiles and injection molding pipe fittings. The results showed that： ① the suitable content of bu- tyl acrylate in vinyl chloride-butyl acrylate copolymer resins were 5 wt% - 10 wt% ; ② through ad- justing production process and polymerization formula, vinyl chloride-butyl acrylate copolymer resins with uniform distribution of butyl acrylate, narrow distribution of relative molecular mass and particles size, and good heat stability could be prepared; ③ vinyl chloride-butyl acrylate copolymer resins could improve the processing and mechanical performances of PVC resins, and could partly replace additives ACR or CPE; ④ PVC profiles and injection pipe fittings modified by vinyl chloridebutyl acrylate copolymer resins were qualified, and the injection production process coule be simplified, the dosages of CaCO3 could be increased, and thus the production cost could be reduced.