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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60~80nm的活性CaCO_3和粒径100~120nm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 powder was improved by increasing the mixing stage at room temperature and optimizing the key process parameters. For the active CaCO_3 with size of 60 ~ 80nm and rutile titanium dioxide with particle size of 100 ~ 120nm And other nano-particles, comparative study of the new compounding process and the traditional mixing process on the uniform dispersion of inorganic nanoparticles, and quantitative analysis of the different stages of the mixing process at room temperature PVC slush powder flowability and slush products The mechanical properties and thermal stability. The results showed that the optimized dry blending process not only effectively improved the uniformity of dispersion and the flowability of slush powders in the slush skin, but also significantly improved the elongation at break, the thermal stability and the heat resistance Volatile loss.