Preparation and Properties of Glass Fiber Reinforced Polypropylene Antibacterial and Anti-Mildew Composites
Pan Liming, Wang Xiaoqun, Lu Chaochao, Chen Jiafeng, Huang Kewei, Xiao Min, Chen Liangjun, Chen Fushuang
Hangzhou Jinzhou Molecule Technology Co. Ltd., Hangzhou 310018, China
摘要：以聚丙烯(PP)为基体，玻璃纤维直接无捻粗纱为增强体，采用双螺杆混炼工艺制备玻璃纤维增强PP复合材料。通过调整2组2个剪切块配合深槽螺杆输送单元，尽量减少对玻纤的挤压和磨损，从而保持玻纤长度，最后通过加粗口径口模出料。在制备的玻纤增强PP复合材料中添加无机磷酸锆载银复合抗菌剂以提高材料的抗菌防霉性能，分别探讨了玻纤和抗菌剂含量(质量分数)对材料力学性能、耐热氧老化性能的影响，研究了抗菌剂含量对材料抗菌防霉性能的影响，并在最佳配方下考察了热氧老化和水浴老化对材料抗菌防霉性能的影响。结果表明，随着玻纤含量的增加，材料力学性能增加明显，当玻纤含量达到25%时，与未加玻纤的相比，拉伸强度提高194%，弯曲强度提高225%，缺口冲击强度提高475%；经150℃热氧老化4000 h后，材料的力学性能较未老化时没有发生明显下降；抗菌剂含量对材料力学性能和耐热氧老化性能影响较小；抗菌剂含量达到0.5%以上时玻纤含量对抗菌性能无影响，且抗菌率大于99.9%，防霉等级1级；最佳配方是玻纤含量25%和抗菌剂含量1%，在该配方下制得的复合材料经过4000 h的150℃热氧老化和95℃水浴老化后抗菌率仍高于99%，防霉等级仍为1级。
Abstract：Glass fiber reinforced polypropylene (PP) composites were prepared by twin screw mixing process with PP as matrix and glass fiber direct roving as reinforcement. In order to minimize the squeezing and wear on the glass fiber for maintaining the glass fiber length, the combination of two groups of two shear blocks with deep groove screw conveying block was adopted, finally, the materials were extruded through the die with large diameter. Inorganic zirconium phosphate containing silver composite antibacterial agent was added into the composites to improve the antibacterial and anti-mildew properties. The effects of the contents of glass fiber and antibacterial agent on the mechanical and thermal-oxydative ageing properties of the composites were discussed respectively. The effects of antibacterial agent content on the antibacterial and anti-mildew properties of the composites were studied. The effects of thermal-oxydative aging and water bath aging on the antibacterial and anti-mildew properties of the composites were investigated under the best formula. The results show that, with the increase of glass fiber content, mechanical properties increase significantly, when the glass fiber content is 25 wt%, compared with the composite without glass fiber, the tensile strength increases by 194%, bending strength increases by 225%, the notched impact strength increases by 475%. After 150℃ thermal-oxydative aging for 4000 h, compared with the composite without aging, the mechanical properties of the composite has no obvious decline. The antibacterial agent content has little effects on mechanical and thermal-oxydative ageing properties. When the antibacterial agent content is more than 0.5 wt%, the glass fiber content has no effect on the antibacterial performances, and the antibacterial rate is more than 99.9%, mildew resistance level is 1. The optimal formula is glass fiber content of 25 wt% and antibacterial agent content of 1 wt%, after 150℃ thermal-oxydative aging for 4000 h and 95℃ water bath aging for 4000 h, the antibacterial rate of the composite prepared with the optimal formula is still higher than 99% and the mildew resistance level is still 1.
Keywords：polypropylene; glass fiber reinforcement; antibacterial; anti-mildew; thermal-oxydative aging
Pan Liming，Wang Xiaoqun，Lu Chaochao，et al. Preparation and properties of glass fiber reinforced polypropylene antibacterial and anti-mildew composites[J]. Engineering Plastics Application，2020，48(5)：57-62.