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世界大部分聚丙烯(PP)生产厂家在开发生产高性能PP的技术,日本生产厂处于这项开发的领先地位。开发的新产品已命名,如“高结晶”PP和“高全同立规”PP,与一般标准PP牌号区别,并允许和批准每千克优质品价格提高0.11美元。 最常用的提高PP性能的方法是提高聚合用催化剂等级,第四代齐格勤—纳塔(Z—N)催化剂是高品位的品种,能生成高结晶度(达99％微晶)产品,并控制共聚单体准确进入共聚物分子链结构,催化剂能改进聚合工艺,大分子成核性和提高PP性能。 提高PP牌号等级并不能与用金属茂催化剂制备的
The majority of polypropylene (PP) manufacturers in the world are developing and producing high-performance PP technology, and Japanese production plants are at the leading position in this development. The new products developed have been named, such as “high crystalline” PP and “highly uniform” PP, which distinguishes it from the general standard PP grades, and allows and approves the price increase of 0.11 US dollars per kilogram of high quality products. The most commonly used method to improve PP performance is to increase the catalyst grade for polymerization. The fourth-generation Ziegin-Natta (ZN) catalyst is a high-grade product that can produce high crystallinity (up to 99% microcrystalline) and control The comonomer accurately enters into the molecular chain structure of the copolymer, and the catalyst can improve the polymerization process, macromolecular nucleation and improve PP performance. Increasing the grade of PP grades cannot be made with metallocene catalysts