聚丙烯耐划伤性能的研究

Study on Scratch Resistance Properties of Polypropylene

研究了填料(不同粒径的滑石粉、超细活性碳酸钙、云母粉、空心玻璃微珠)、增韧剂(乙烯基弹性体POE、三元乙丙橡胶EPDM)、耐划伤助剂、产品的表面形态对聚丙烯的(PP)耐划伤性能的影响。结果表明,随着填料含量的增加,色差(ΔE)增大,PP的耐划伤性能下降;当滑石粉和超细活性碳酸钙的质量分数是25%时,PP的ΔE增大了3倍,PP的耐划伤性能急剧下降。滑石粉的目数越高,ΔE越小,耐划伤性能越好;滑石粉(3 000目)、超细活性碳酸钙的效果最好。POE、EPDM的加入使PP的耐划伤性能下降,而且其添加量越大,耐划伤性能越差。耐划伤助剂能有效改善PP的耐划伤性。产品的表面形态对PP的耐划伤性能影响很大,皮纹越大、越深,PP的耐划伤性能越差。

The paper studied in detail the effects of the fillers （talc with different particle size, superfine active calcium carbonate, mica, hollow glass microsphcres） , toughening agents （vinyl elastomer of POE, ethylene propylene terpolymer） , scratch resistant additives and the surface morphology of product on scratch resistant properties of the polypropylene （PP）. The results showed that： with the increase of the filler content, the color aberration （△E value） increases, the scratch resistance of PP decreases; with the filler content of 25 % , △E value of PP is quadrupleds, and the scratch resistance of PP sharply declines. The smaller the talc particle size, the smaller the △E value and the better the scratch resistance of PP. Meanwhile the effect of talc （3 000 mesh） and superfine active calcium carbonate is the best. The addition of POE or EPDM makes the scratch resistance of PP decline, and the greater their amounts are, the worse the scratch resistance of PP is. Scratch-resistant agents can effectively improve the scratch resistance of PP. The surface morphology of the product has a great influence on the scratch resistance of PP： when the striation of the product is bigger and deeper, the scratch resistance of PP is worse.