再生家电壳体聚丙烯材料性能改善研究

Study on Property Improvement of Polypropylene Material for Recycled Household Appliance Shell

再生家电壳体聚丙烯材料通过玻璃纤维增强改性可以显著提升材料的拉伸强度及弯曲模量,但由于再生聚丙烯材料中杂质的影响,材料的缺口冲击强度没有获得明显提升。从改善再生家电壳体聚丙烯材料性能的角度出发,通过掺入再生聚丙烯、添加弹性体和改变玻璃纤维直径等研究了改性材料的性能差异。在全新聚丙烯与再生聚丙烯共混体系中,随着再生聚丙烯含量增加,改性材料的弯曲模量无明显变化,但缺口冲击强度急剧下降。当再生聚丙烯添加质量分数大于30%时,改性材料的缺口冲击强度下降35%。在玻璃纤维增强再生聚丙烯体系中,通过添加质量分数为5%的弹性体,可以显著改善改性材料的缺口冲击强度,同时保持良好的拉伸强度与弯曲模量;使用小直径玻璃纤维可以明显改善改性材料的缺口冲击强度,当玻璃纤维直径由14μm降低至10μm时,缺口冲击强度由8 kJ/m^(2)提升至11 kJ/m^(2)。

The tensile strength and flexural modulus of the polypropylene material for recycled household appliance shell can be significantly improved by glass fiber reinforced modification,but the notch impact strength has not been significantly improved due to the influence of impurities in the recycled polypropylene material.From the perspective of improving the properties of the polypropylene material for recycled household appliance shell,the differences of material properties were studied by adding recycled polypropylene,adding elastomer and changing the diameter of glass fiber.In the blend system of new polypropylene and recycled polypropylene,with the increase of recycled polypropylene content,the flexural modulus of the material has no obvious change,but the notch impact strength decreases sharply.When the mass fraction of recycled polypropylene is higher than 30%,the notched impact strength of the modified material decreases by 35%.In the glass fiber reinforced recycled polypropylene system,the notched impact strength of the modified material can be significantly improved by adding 5%mass fraction of elastomer,while maintaining good tensile strength and flexural modulus.The notch impact strength of the modified material can be significantly improved by using small diameter glass fiber.When the diameter of glass fiber is reduced from 14μm to 10μm,the notch impact strength is increased from 8 kJ/m^(2) to 11 kJ/m^(2).