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为改善注射器用PPR的耐低温冲击性能,采用m-LLDPE对其进行增韧改性,并通过添加PBE来改善混合体系的流动性和透明性。通过共混熔融方法制备PBE/m-LLDPE/PPR材料,利用熔融指数测定仪、万能力学试验机以及雾度仪等对改性前后的材料进行表征。结果表明:m-LLDPE降低了PPR的流动性,却显著的提高了其抗冲击性能,当添加量为15%时,材料的拉伸屈服应力得到良好保持,缺口冲击强度在常温和-20℃下分别达到10.4和3.7KJ/m2,比纯PPR提高了近75%。PBE改善了m-LLDPE/PPR共混体系的流动性能和透明性,添加量为10%时,PBE/m-LLDPE/PPR共混体系的各项物理指标达到注射器具用PPR的行业标准。
In order to improve the low temperature impact resistance of PPR for injection molding, the m-LLDPE was used to toughen PPR and the PBE was added to improve the fluidity and transparency of the mixed system. The PBE / m-LLDPE / PPR materials were prepared by blending and melting method, and the materials before and after modification were characterized by melt index tester, universal mechanics tester and haze meter. The results showed that the m-LLDPE reduced the flowability of PPR, but significantly improved its impact resistance. When the addition amount was 15%, the tensile yield stress of the material was well maintained. The notched impact strength at room temperature and -20 ℃ Under 10.4 and 3.7 KJ / m2 respectively, an increase of nearly 75% over pure PPR. PBE improved the flowability and transparency of the m-LLDPE / PPR blend system. The physical properties of the PBE / m-LLDPE / PPR blends reached the industry standard of PPR for injection molding at 10%.