摘要
在聚氯乙烯(PVC)挤出成型工艺的基础上,结合聚氨酯(PU)的反应特点,选用经钛酸酯表面处理过的纳米二氧化硅(nano-SiO2)作为纳米材料,对PU/nano-SiO2/PVC复合材料进行了探索,利用超声辐照技术并经搅拌将nano-SiO2分散于液化4,4′-二苯基甲烷二异氰酸酯(L-MDI)中,良好地解决了物料的分散问题;研究了反应挤出工艺条件对复合材料性能的影响。结果表明:挤出速度40～50 r/min、均化段温度180～190℃最为合适;PU/nano-SiO2的质量比为5∶1时,对PVC的增韧效果最佳,PU和nano-SiO2能协同增韧PVC,且nano-SiO2具有补强作用,当PU/nano-SiO2/PVC质量比为5∶1∶20时,复合材料的综合性能最优。
Based on the extrusion moulding of polyvinyl chloride （PVC）, and combined with polyurethane （PU） reaction characteristics, taking nanometer silicon dioxide （nano-SiO2） surface treated by titanate ester as nano-material, the PU/nano-SiO2/PgC composite was studied. The problem of materials dispersion was removed with nano-SiO2 dispersed in liquefied 4, 4＇-diphenylmethane diisoeyanate （L-MDI） by ultrasonic wave irradiation technology and stirring operation. The effect of reaction extrusion condition on the composite capability was studied. The optimum extrusion eondition was extrusion rate 40 -50r/min, temperature was 180-190℃; The optimum toughening effectiveness was acquired when the mass ratio of PU to nano-SiO2 equaled to 5： 1 ; There existed a synergism in toughening between nano-SiO 2 and PU, and nano-SiO2 played a function as reinforcer. When the mass ratio of PU to nano-SiO2 to PVC was 5 ： 1 ： 20, the composite had excellent comprehensive properties.
出处
《塑料工业》
CAS
CSCD
北大核心
2009年第5期20-23,共4页
China Plastics Industry
关键词
反应挤出
聚氨酯
纳米二氧化硅
聚氯乙烯
工艺
Reactive Extrusion
Polyurethane
Nanometer Calcium Carbonate
Polyvinyl Chloride
Technology
