欠注成型工艺对PP微孔发泡材料发泡行为的影响.pdf

第43卷第9期
塑料工业
2015年9月
CHINA PLASTICS INDUSTRY
61
欠注成型工艺对PP微孔发泡材料发泡行为的影响
刘阳夫…2,张翔2,张纯,蒋团辉,龚维23“,何力2
(1.贵州大学材料与冶金工程学院,贵州贵阳550025;2.国家复合改性聚合物材料工程技术研究中心,贵州贵阳550014
3.贵州师范大学,贵州贵阳55000)
摘要:采用欠注注塑发泡成型工艺,通过控制射胶时间制备了聚丙烯(P)微孔发泡材料,分析了试样中泡孔
的结构特点;并研究了射胶时间和熔体温度对PP微孔发泡材料发泡行为的影响规律。结果表明,射胶时间对试样结
构和PP发泡行为影响很大,射胶时间较短时试样形状不完整;射胶时间较长时试样发泡空间小,泡孔成核少,而当
射胶时间为1.6s和1.8s时PP发泡行为较理想,其泡孔平均直径分别为34、50μm,泡孔密度分别达到3.0x10°
2.8x10°个/cm3。随着熔体温度升高,嫆体强度降低,导致泡孔直径增大,泡孔密度减小,泡孔尺寸分布不均匀。嫆
体温度为180℃时,PP发泡行为较理想,其泡孔直径和泡孔密度分别为35um、3.0x10个/cm
关键词:欠注成型;发泡行为;聚丙烯;熔体温度;射胶时间
DOI:10.3969/jisn.1005-5770.2015.09.015
中图分类号:TQ320.66+2
文献标识码:A
文章编号:1005-5770(2015)09-0061-05
Effects of Owe Injection Foaming Method on Foaming Behaviors of
PP Microcellular Foams
LIU Yang-fu", ZHANG Xiang, ZHANG Chun, JIANG Tuan-hui, GONG We2, HE L',2
(1. College of Materials and Metallurgy, Guizhou University, Guiyang 550014, China
2. National Engineering Research Center for Compounding and Moification of Polymeric Materials, Guiyang 550014, China
3. Guizhou Normal University, Guiyang 550001, China
Abstract: Polypropylene (PP ) microcellular foams were prepared using the owe injection foaming
method by controlling the injection time. The characteristics of the cell structure was analyzed. And the
effects of injection time and melt temperature on the foaming behaviors of PP microcellular foams were also
investigated. The results showed that the injection time had a reat influence on the structure and the foaming
behaviors of PP samples. The short injection time led to imperfect sample shapes while the long injection time
reduced the foaming room and cell nucleus. When the injection time was 1.6 s and 1.8, the foam behaviors
of PP were preferable with the average diameters of the cell of 34 wm and 50 wm and the cell densities of 3. 0x
10 cells/cm and 2. 8x10 cells/cm, respevtively. It was found that the melt strength decreased as the melt
temperature increased, which led to the increase of cell diameter, the decrease of cell density and the uneven
distribution of the cell sizes. When the melt temperature was 180C, the foaming behavior was good with th
average diameter and cell density of the cell of 35 wm and 3. 0x10 cell/cm'respevtively
Keywords: Owe injection; Foaming Behaviors Polypropylene; Melting Temperature; Injection Time
微孔发泡聚合物具有密度小、比强度高、能量吸孔发泡注塑成型方法有释压法、二次开模法、松退
收能力强、抗冲击性及减震性能好、隔音隔热性强等法、欠注法等,其中欠注法最适用于工业化生产,但
系列特点,已在交通、运输、军工、航天航空、电其发泡行为较其他方式稍差]。因此,如何改善欠
子及日用品等领域获得了广泛应用]。注塑成型技注注塑发泡材料的泡孔质量,已成为微孔发泡聚合物
术是微孔发泡聚合物材料的成型方法之一,常用的微材料研究的热点。
来贵州省科技厅重大专项黔重大专项(2012)6023号,黔科合人オ团队[2014]4006号,黔科教(2010)009号
*联系人gw20030501@163,com*联系人proline@163.com
作者简介:刘阳夫,男,1900年生,硕土研究生,主要从事聚合物微孔发泡技术的研究。ae2l45@vip.q.com