通过增加室温混合阶段并优化关键工艺参数的方式改进了聚氯乙烯(PVC)搪塑粉料的传统混料工艺,针对粒径60~80 nm的活性CaCO3和粒径100~120 nm的金红石型钛白粉等纳米颗粒,对比研究了新混料工艺和传统混料工艺对无机纳米颗粒均匀分散的影响,并定量分析了在室温混合阶段的不同工艺参数下PVC搪塑粉料的流动性和搪塑制品的力学性能及热稳定性.结果表明:优化后的干混工艺不仅有效提高了搪塑表皮中纳米颗粒分散均匀性和搪塑粉料的流动性,而且明显改善了搪塑表皮的断裂伸长率、热稳定性和耐热挥发损失性.
The traditional mixing process of polyvinyl chloride (PVC) slush molding powder was improved by adding mixing phase at room temperature and optimizing the key processing parameters of the new phase.Different influences on the homodisperse of inorganic nanoparticles between the new process and the traditional process were compared using active CaCO3 with particle sizes of 60-80 nm and rutile titanium dioxide with particle sizes of 100-120 nm as raw materials.Besides, the effects of different process parameters of mixing at room temperature on material properties such as the fluidity of slush molding powder, mechanical property and thermostability of slush molded skins were analyzed quantitatively.The results show that the optimized mixing process can enhance the uniform dispersibility of nanoparticles in PVC slush molded skins and the fluidity of PVC slush molding powder, and it can improve the elongation at break, thermostability and resistance of hot air loss of PVC slush molded skins.
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