
无规共聚聚丙烯悬臂梁冲击强度测试的影响因素研究
韩松涛, 郝春波, 修忠海, 李娇, 肖大君, 王宇, 武天希
无规共聚聚丙烯悬臂梁冲击强度测试的影响因素研究
Study on Influencing Factors of Izod Impact Strength Test of Random Copolymer Polypropylene
冲击强度是聚丙烯树脂一项重要的性能指标,采用悬臂梁形式测定聚丙烯树脂冲击强度前,测试样条需经注塑成型并制V形切口。实验采用两种不同熔体流动速率的无规共聚聚丙烯树脂,通过调整注射机的注塑条件及切口机对样条开口的切口强度,探究注塑条件及开口深度、切口弧度及切口根部曲率半径对两种无规共聚聚丙烯悬臂梁冲击强度的影响,以期为正确评定塑料材质的冲击强度提供依据。结果表明:降低聚丙烯的熔融温度、降低注射速度及注射压力、减少保压时间可提升无规共聚聚丙烯的悬臂梁冲击强度。采用不同的开口机对注塑后的样条进行开口,对样条冲击强度大小影响很大,且两种聚丙烯树脂的冲击强度变化趋势相同。切口深度较浅、根部曲率半径越大、切口角度越大,切口处应力和应变越集中,无规共聚聚丙烯的悬臂梁冲击强度越大。
The impact strength of polypropylene resin is an important property index. Before using a cantilever beam to measure the impact strength of polypropylene resin, the test spline needs to be injection molded and V-shaped incision made. The article uses two different melting indexes of random copolymer polypropylene resin. By adjusting the injection molding conditions and the notch strength of the spline opening by incision machine, The effects of injection molding conditions and opening depth, incision radian and curvature radius of incision root on the Izod impact strength of two kinds of random copolymer polypropylene were investigated in order to provide a basis for correctly evaluating the impact strength of plastic materials. The results show that the Izod impact strength of random copolymer polypropylene can be improved by reducing the melting temperature of polypropylene, reducing the injection speed and injection pressure, and reducing the holding time. Different opening machines are used to open the injection molded spline, which has a great influence on the impact strength of the spline, and the impact strength of the two polypropylene resins has the same change trend. The shallower the notch depth, the larger the radius of the root curvature, the larger the notch angle, the more concentrated the stress and strain at the notch, and the greater the Izod impact strength of the random copolymer polypropylene.
无规共聚聚丙烯树脂 / 熔体流动速率 / 注塑工艺 / 切口强度 / 悬臂梁冲击强度
Random copolymer polypropylene resin / Melt flow rate / Injection Molding Process / Notch strength / Izod impact strength
TQ325.1+4
1 |
曹瑞莹.滑石粉/弹性体/废旧PP复合材料的制备及性能研究[D].西安:西安理工大学,2018.
|
2 |
郭明海.微观结构对抗冲共聚聚丙烯冲击强度的影响[J].石油化工,2020,49(12):1241-1245.
|
3 |
黎敏.汽车内饰件聚丙烯材料的制备、性能及应用研究[D].长沙:国防科学技术大学,2016.
|
4 |
王居兰,王林,袁炜.中熔体流动速率无规共聚聚丙烯的结构与性能[J].合成树脂及塑料,2022,39(3):60-63.
|
5 |
王海燕,段世杰,郭星.制样条件对抗冲共聚PP悬臂梁冲击强度测试结果的影响[J].石化技术,2013,20(4):28-30.
|
6 |
|
7 |
贲信学.如何提高聚丙烯抗冲共聚物低温冲击强度[J].内蒙古石油化工,2012,38(6):32-33.
|
8 |
刘富绪.优化工艺条件提高聚丙烯抗冲共聚物低温冲击强度[J].中国新技术新产品,2009(18):110-111.
|
9 |
王行连.抗冲共聚聚丙烯(PP)低温摆锤冲击试验冷冻方式探究[J].塑料助剂,2019(6):33-37.
|
10 |
|
11 |
|
12 |
|
13 |
|
14 |
刘小妹,潘颖,范志毅.尖V形切口的脆性断裂准则[J].上海工程技术大学学报,2006(4):319-322.
|
15 |
|
16 |
符若文,李谷,冯开才,等.高分子物理[M].北京:化学工业出版社,2005.
|
17 |
马国良.提高聚丙烯抗冲共聚物低温冲击强度的研究[J].内蒙古石油化工,2015,41(8):14-16.
|
18 |
上官勇刚,郑强,彭懋,等.聚丙烯催化合金(PP-c)的晶体结构及其影响因素[J].高等学校化学学报,2005,26(12):2386-2390.
|
19 |
任玉方.α成核剂和工艺条件对聚丙烯注塑件结晶与力学性能的影响[D].郑州:郑州大学,2014.
|
20 |
曹瑾瑾,谢昕,雷自强,等.注射工艺条件对抗冲共聚聚丙烯力学性能的影响[J].塑料科技,2011,39(11):63-68.
|
21 |
|
22 |
李素云,刘长伟,陈炎,等.聚丙烯注射模塑工艺条件与结构形态及性能的关系[J].北京化工学院学报,1983(2):108-117.
|
23 |
郭乔,程春峰,李贵阳.试样缺口对悬臂梁缺口冲击强度测试结果的影响研究[J].合成材料老化与应用,2013,42(1):14-16.
|
24 |
|
25 |
|
26 |
束德林.工程材料力学性能[M].北京:机械工业出版社,2016.
|
27 |
于杰,金志浩,周惠久.聚合物材料冲击缺口敏感性的研究[J].塑料工业,1994(4):47-49, 55.
|
28 |
|
29 |
陈涛,戴婷,匡莉.聚丙烯材料简支梁缺口冲击性能的时温效应研究[J].塑料工业,2021,49(2):116-120.
|
30 |
洪定一.聚丙烯:原理,工艺与技术[M].北京:中国石化出版社,2002.
|
31 |
郭生伟,侯倩,王鑫,等.光响应偶氮苯基长链小分子功能化聚乙烯醇的合成与性能[J].合成化学,2019,27(9):723-727.
|
/
〈 |
|
〉 |