汽车膨胀水箱聚丙烯专用料研制及表征

Development and Characterization of PP Materials Used for Expansion Water Tank of Automobile

以不同种类聚丙烯为基体,采用抗氧剂、抗光老化剂、成核剂和增透剂复配,通过挤出工艺制备了汽车膨胀水箱聚丙烯专用料,测试了专用料的力学性能、耐热性能和透光率,在此基础上对优选的材料进行了光老化和热老化性能测试,并利用氧化诱导时间来评估材料热老化性能,推算材料使用寿命。结果表明,将高流动性高透光率的聚丙烯B4808与低流动性高韧性的聚丙烯4220按质量比30∶70混配,同时将受阻酚类抗氧剂、硫醚类抗氧剂、抗光老化剂UV327、成核剂和增透剂按质量比0.15∶0.45∶0.2∶0.5∶2复配,可获得综合性能较为优异的专用料,其透光率达到84%;该材料经加速光老化1 000 h后的拉伸强度和冲击强度仍分别大于25 MPa和70 kJ/m^2,使用寿命预估为18 a,可满足汽车膨胀水箱的应用要求。

Different kinds of polypropylene(PP)were used as matrix,antioxidants,anti-photoaging agent,nucleating agents and transparent agent were compounded,the PP materials used for expansion water tank of automobile were prepared by extrusion.The mechanical properties,heat resistance and transmittance of the materials were tested,on this basis,photoaging and thermal aging test of the optimal material were done and the thermal aging performance was assessed with oxidation induction time for calculating the using life of the material.The results show that,blending the PP of B4808 with high fluidity and high transmittance and PP of 4220 with low fluidity and high toughness as their mass ratio of 30∶70,and compounding hindered phenolic antioxidant,sulfoether antioxidant,anti-photoaging agent UV327,nucleating agent and transparent agent as their mass ratio of 0.15∶0.45∶0.2∶0.5∶2,a PP material with excellent comprehensive performances can be gained and its transmittance can reach 84%.After accelerating photoaging for 1 000 h,the tensile strength and impact strength of the gained material are still greater than 25 MPa and 70 kJ/m^2 respectively,the estimated using life is 18 a,which can meet the application request of expansion water tank of automobile.