Hot-melt phenolic resin, prepreg, composite material and preparation method

The invention provides a hot-melt phenolic resin, a prepreg, a composite material and a preparation method of the hot-melt phenolic resin, the hot-melt phenolic resin is prepared from phenol, aldehyde and a catalyst, the catalyst is ammonia water, and the molar ratio of the phenol to the aldehyde to the catalyst is 1: (1.13-1.54): (0.01-0.02). The high-temperature mechanical property of the composite material is improved by changing a hot-melt phenolic resin catalyst system and a raw material ratio; hollow microspheres are added into a phenolic resin matrix, so that the density and heat conduction of the composite material are reduced; and the prepreg prepared by the hot melting method has the advantages of high resin content control precision, low volatile component content and no environmental pollution problem. 本发明提供一种热熔酚醛树脂、预浸料、复合材料及其制备方法，所述热熔酚醛树脂的制备原料包括酚、醛、催化剂，所述催化剂为氨水，所述酚、醛、催化剂的摩尔比为1：（1.13-1.54）：（0.01-0.02）。本发明通过改变热熔酚醛树脂催化剂体系和原材料配比提升复合材料的高温力学性能；在酚醛树脂基体中添加空心微珠降低复合材料的密度及热传导；并且通过热熔法制备的预浸料树脂含量控制精度较高、挥发分含量低、