结构反应注射成型工艺对聚氨酯复合材料表面性能的影响

Effects of SRIM Process on Surface Performance of Polyurethane Composites

采用结构反应注射成型工艺制备的纤维增强聚氨酯复合材料制件(简称SRIM制件)的表面性能差,提高表面性能是SRIM工艺制备高品质产品的关键技术之一。文中研究了SRIM工艺对制件表面性能的影响以及改善方法,即选择适当的无纺织物作为附加表层或在局部保持适当的压力水平。激光共聚焦扫描显微镜的研究结果表明,采用两种不同无纺织物的组合对SRIM制件表面性能的改善效果优于单一无纺织物;保持压力8.0 MPa,同时采用无纺织物B和C,可以明显改善SRIM制件的表面性能,粗糙度为0.30μm,表面观察不到玻璃纤维的痕迹,仅出现细微的桔皮状和极少量的黑色缩痕。

Polyurethane （PU） composite parts prepared by SRIM process （SRIM parts） usually have poor surface performance. Improving the surface performance is one of the key technologies for preparing SRIM parts with high quality. Effects of SRIM process on the surface perfor- mance of SRIM parts were studied, and presented advanced technologies for improving the surface performance by using appropriate additional surface layers or local input of holding appropriate pressure. Confocal-LSM micrographs show, the effect of combination of two different nonwoven fabrics on the surface performance is superior to that of a single non-woven fabric. When local input of holding pressure 8.0 MPa, combining with non-woven fabrics B and C as surface layers, surface performance of SRIM parts can be dramatically improved, its roughness is 0. 30 μm, there are no fiber markings on the surface, only exists very slight orange-peel effects and few black sink marks, whose diameters less than 10μm.