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聚氯乙烯(PVC)树脂是我国目前最大宗的塑料树脂之一,由于其价格低廉,性能优越,应用很广。1974年美国固里得里希公司发现PVC树脂中残留的氯乙烯(VCM)单体对人体有致癌的毒性,使它的使用范围受到限制。近年来国内外工程技术人员进行了大量的研究工作,从对PVC树脂的分子结构和聚合配方研究开始转向聚合工程和颗粒微结构的研究。实践证明,PVC的有些性能对分子的构造关系不大,而与颗粒的微结构有关,从扫描电镜观察结果表明,树脂颗粒皮膜的厚度,连续性,内部二次粒子的大小和聚集状态等都会影响树脂的脱吸速度,增塑剂的渗透性,加工性和制品透明性等。
Polyvinyl chloride (PVC) resin is currently China’s largest plastic resin, due to its low cost, superior performance, a wide range of applications. In 1974, the United States Solid Radix Company found PVC resin residual vinyl chloride (VCM) monomer on the human body carcinogenic toxicity, making its use is limited. In recent years, domestic and foreign engineers and technicians conducted a lot of research work, starting from the molecular structure of PVC resin and polymerization formula research began to polymerization engineering and particle microstructure. Practice has proved that some properties of PVC have little to do with the structure of the molecule, but with the microstructure of the particles. The SEM observation shows that the thickness of the resin particle coating, the continuity, the size and internal aggregation of secondary particles, etc. Affect the speed of resin desorption, plasticizer permeability, processability and product transparency.