不同色浆质量分数的水性聚氨酯涂料对聚氯乙烯表皮低温爆破性能的影响

本文制备了一系列不同色浆质量分数的水性聚氨酯涂料,并将其喷涂在汽车仪表板聚氯乙烯(PVC)表皮的背面形成复合材料。 用旋转流变仪表征了涂料的粘度以评价其喷涂性能;用差示扫描量热仪表征了材料的玻璃化转变温度(T_g);利用万能材料试验机表征了材料在-30 ℃条件下的拉伸性能及抗撕裂性能;用动态热机械分析仪表征了材料的损耗比随温度的变化。 结果表明:不同色浆质量分数的涂料都能喷涂,含有涂层材料PVC表皮在-30 ℃低温爆破性能与涂层材料的T_g、低温拉伸性能、抗撕裂性能的关系并不大,而与涂层材料的阻尼性能直接相关。 材料的阻尼性能越好,其低温爆破性能越好。

Effect of Mass Fraction of Color Paste in Waterborne Polyurethane Coatings on Low Temperature Blasting Properties of Polyvinyl Chloride Skin

In this paper, a series of waterborne polyurethane coatings with different concentration of color paste was prepared, and the coating was sprayed at the backside of polyvinyl chloride (PVC) skin of automotive instrument panel to form a composite. The spraying property of the coating was evaluated by measuring the viscosity of coating by rheometer; the glass transition temperature (T_g) of sample was characterized by differential scanning calorimeter; the tensile properties and tear resistance of sample under -30 ℃ were characterized by universal material testing machine; and the damping factor of sample was characterized by dynamic mechanical thermal analysis. It was observed that the coating with different mass fraction of color paste can be sprayed. The blasting property of PVC skin at -30 ℃ was found to be related with the damping factor of the sample rather than the T_g, tensile properties and tear resistance of sample under low temperature. The bigger the value of damping factor was, the better the lasting property of PVC skin with coating layer had.