探讨聚丙烯(pp)改性料的收缩率（The shrinkage of polypropylene (PP) modified material was studied）.docVIP

探讨聚丙烯(pp)改性料的收缩率（The shrinkage of polypropylene (PP) modified material was studied） Study of polypropylene (PP) modified material shrinkage Polypropylene is a general-purpose plastics one of the large amount of varieties, such as low density, good rigidity, bending resistance, chemical corrosion resistance, good insulation. The drawback is that the low temperature impact performance is poor, easy to aging, molding shrinkage rate. PP can be improved by modification of low-temperature impact performance, molding shrinkage and thermal aging properties. Make use of polypropylene to expand a large degree of convergence, instead of the traditional engineering plastics in many occasions. Adequate sources of raw materials, polypropylene prices, so in recent years in the industry of modified polypropylene plastic to occupy the first place, become the main varieties of modified plastics, people pay more and more attention. The modified polypropylene material shrinkage rate control is an important aspect of modification of polypropylene. Significant shrinkage control of polypropylene modified material is used, is also an important aspect of product quality assurance. In particular the use of modified polypropylene to replace the traditional engineering plastic shrinkage, this point is very important. The modified polypropylene has a mature technology in China, study on the physicochemical properties of reported polypropylene are many, but the problem of shrinkage is seldom reported. I set many years of practical experience on modified PP shrinkage control problem is discussed. The 1. part test 1.1 test materials Polypropylene (PP) of Liaoyang Petrochemical Company; high density polyethylene (HDPE) of Liaoyang Petrochemical Corporation The United States POE DuPont Co; Holland DSM EPDM SBS company; Yueyang petrochemical plant Shanghai Yaohua Glass calcium carbonate; Yingkou Dashiqiao; Haicheng new gold powder Hebei City, the sale of mica powder; additives; low density polyethyle