资源描述：
《常用工程塑料名称特性用途》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、一、PP塑料(聚丙烯)，英文名称olypropylene比重:0.9-0.91克/CM3成型收缩率:1.0-2.5%成型温度：160-220℃干燥条件：---物料性能：密度小,强度刚度,硬度耐热性均优于低压聚乙烯,可在100度左右使用.具有良好的电性能和高频绝缘性不受湿度影响,但低温时变脆,不耐模易老化.用途：适于制作一般机械零件,耐腐蚀零件和绝缘零件成型性能：1.结晶料,吸湿性小,易发生融体破裂,长期与热金属接触易分解.2.流动性好,但收缩范围及收缩值大,易发生缩孔.凹痕,变形.3.冷却速度快,浇注系统及
2、冷却系统应缓慢散热,并注意控制成型温度.料温低方向方向性明显.低温高压时尤其明显,模具温度低于50度时,塑件不光滑,易产生熔接不良,留痕,90度以上易发生翘曲变形4.塑料壁厚须均匀,避免缺胶,尖角,以防应力集中.二、PE塑料(聚乙烯)英文名称olyethylene implementationmodel. Payspecialattentiontopreventfloatingstyle,dosomethingsuperficial,cosmetic,overcometheloveofwork,short
3、ofaname,oneofthebenefitsofbadideas.Tostrengthenthesenseofdedication.OfficeintheworkoftheGovernment"nervecentre",task,andburden,busywithwork,hard,toughandsometimesthankless. ComeintotheOfficethedoor,willnotname,notforprofit,unsungherowilling;tostanduptoall
4、kindsofmisunderstandings,disappointmentsandsetbacks,inclusiveofupsanddowns;"anyhardlabor,difficult,pickishardtopickofDan"thespiritofloveanddedication,andhardwork.Second,capacity-building,top-notchperformance.OfficeoftheWorkliesinthepeople. Governmentoffic
5、esatalllevelsmustfollowthe16sessionoftheplenumonstrengtheningtherulingabilityconstructionofthepartyinordertoimprovetheprofessionalqualityasthecore,tostrengthencapacity-building,pickedupapentowrite,pensaid,whenanythingcanbedone.Toenhancetheresearchcapacity.
6、NeitherleadersnortheGeneralstaff,willcontinuetofacethemasses,facerealityandsociety,doingtheresearchwork.Conditionspermitting,areoftengrassroots,institutionalized,andperseverance.Investigationdepthmustnotbesuperficial,alsomusthavethebreadthmustnotbebiased.
7、 Throughresearch,formedaquality,thoughtful,valuableresearchreports,improvingtheabilitytoanalyzeandsolvepractical比重:0.94-0.96克/CM3成型收缩率:1.5-3.6%成型温度：140-220℃干燥条件：---物料性能：耐腐蚀性,电绝缘性(尤其高频绝缘性)优良,可以氯化,辐照改性,可用玻璃纤维增强.低压聚乙烯的熔点,刚性,硬度和强度较高,吸水性小,有良好的电性能和耐辐射性;高压聚乙烯的柔软性
8、,伸长率,冲击强度和渗透性较好;超高分子量聚乙烯冲击强度高,耐疲劳,耐磨.用途：低压聚乙烯适于制作耐腐蚀零件和绝缘零件;高压聚乙烯适于制作薄膜等;超高分子量聚乙烯适于制作减震,耐磨及传动零件.成型性能：1.结晶料,吸湿小,不须充分干燥,流动性极好流动性对压力敏感,成型时宜用高压注射,料温均匀,填充速度快,保压充分.不宜用直接浇口,以防收缩不均,内应力增大.注意选择浇口位置,防止产生缩孔和变形.2.收缩范围和收缩值
