熔喷布专用PP(柔顺剂）（增柔剂）

熔喷布专用pp(柔顺剂）（增柔剂）

pp塑料，化学名称：聚丙烯　　

英文名称:polypropylene（简称pp）　　

比重:0.9-0.91克/立方厘米

成型收缩率:1.0-2.5%

成型温度：160-220℃ 。　　

成分结构　　

pp为结晶型高聚物，常用塑料中pp轻，密度仅为0.91g/cm3（比水小）。通用塑料中，pp的耐热性好，其热变形温度为80-100℃，能在沸水中煮。pp有良好的耐应力开裂性，有很高的弯曲疲劳寿命，俗称“百折胶”。pp的综合性能优于pe料。

pp产品质轻、韧性好、耐化学性好。

pp的缺点：尺寸精度低、刚性不足、耐候性差，它具有后收缩现象，脱模后，易老化、变脆、易变形。

pp 台湾台塑 3084

产品名称： pp 聚丙烯

性 能：化学稳定性、电性能、耐候性，具有较高的耐冲击性，机械性质强韧，抗多种有机溶剂和酸碱腐蚀。适于制作一般机械零件、耐腐蚀零件和绝缘零件。

pp molding characteristics: 1. crystalline material, hygroscopicityis small, easy to happen melt break, long-term contact with hotmetal easy to decompose. 2. good li, but the shrinkage rangeand shrinkage value, prone to shrinkage hole. dents, deformations.3. cooling speed, pouring system and cooling system should beslowly cooling, and pay attention to control molding temperature.easy to orientate at low temperature and high pressure, mold,temperature less than 50 degrees, plastic parts not smooth, easy toproduce bad fusion, flow mark, 90 degrees or more prone to warpagedeformation. 4. plastic wall thickness must be uniform to avoidlack of glue, sharp angle, to prevent stress concentration. ppproperties overview: 1, density pp is all synthetic resin mediumdensity, small. pp plastic products can only be added to the mainand auxiliary antioxidants, without the need to add ultravioletabsorbent. 2. the tensile strength and rigidity of the mechanicalproperties of pp are good, but the impact strength is bad,especially at low temperature. in addition, if there is orientationor stress in the molding process, the impact strength will besignificantly reduced. although the impact strength is poor, afterbeing filled or reinforced, its mechanical properties can competewith the engineering plastics with high cost in many fields. 3,surface hardness pp surface hardness in five general purposeplastics is low, only better than pe. when the crystallinity ishigher, the hardness is also increased, but still less than pvc,ps, abs and so on. it has good electrical insulation.