酚醛树脂在线预浸拉挤工艺探索

The study of the on-line prepreg pultrusion process of phenolic resin

由于拉挤酚醛树脂在固化成型时有非活性稀释剂挥发,导致制品疏松,强度低,为了改善这一缺陷,本文将拉挤工艺与预浸技术结合,开发出酚醛树脂在线预浸拉挤工艺,即将浸胶纱在85℃进行烘干处理10 min,在入模前有效除去非活性稀释剂以及大部分游离醛和部分游离酚,解决了传统酚醛拉挤工艺中挥发物难控制的问题,同时不影响酚醛树脂的固化过程。通过对两种制品的物理和机械性能的测试、分析,发现预浸拉挤制品的孔隙率和吸水率显著降低,密度、压缩性能、层间剪切强度和冲击韧性得到大幅度提高,证明预浸拉挤在工艺上可行。

Due to the volatilization of inactive diluent during the curing of phenolic resin,the pultruded products are loose and have low strength.In order to improve this defect,the on-line prepreg pultrusion process of phenolic resin was developed by combining pultrusion process with prepreg technology.That was,the impregnated yarn was dried at 85℃for 10 min,which can effectively remove the inactive diluent,most free aldehydes and some free phenols before entering the mold,which solved the problem to control the volatiles in the traditional phenolic pultrusion process,and the curing process of phenolic resin was not affected.By testing and analyzing the physical and mechanical properties of two products,it is found that porosity of the prepreg pultrusion products and the water absorption were significantly reduced.And the density,compressibility,interlaminar shear strength and impact toughness were improved greatly,proving the processing feasibility of the prepreg pultrusion.