增韧聚甲醛抗冲性能的影响因素

The Influencing Factors on The Impact properties of Toughened Polyacetals

本文从理论上对增韧聚甲醛的抗冲性能的影响因素进行了探讨。对聚甲醛抗冲性能的影响主要是抗冲改性剂的玻璃化温度、含量、粒径、分布,与母体树脂的结合力、母体树脂的类型等等。本文还比较了美国、日本、德国以及我国、台湾等研究机构、各大公司增韧工艺的差异。认为:要提高聚甲醛的抗冲性能,应选择玻璃化温度低于-35℃的增韧体,增韧体含量在10—30％,同时,随着增韧体粒径减小,缺口冲击强度则增大。

The influencing factors on the impact fatigue resistence of polyacetals wereinvestigated theoretically,they included glass transition temperature,averageparticule size and distributions,adhesion to the matrix,and contents of impactmodifiers,as well as the type of the matrix,etc.In this work,various toug-hening processes of polyacetals from U.S.,Japan,Germany,China mainlandand Taiwan province have been compared.And,it was realised that for impro-ving the impact resistence of POM 10-30% loading of an impact modifierwith Tg below -35℃.have to be the first choice and that the notched Izodimpact increased with the particule size reduction of the toughening agents.