为提升碳纤维/环氧复合材料的防护性能，降低其吸水率，延长复合材料的使用寿命，采用不同相对分子质量的聚四氢呋喃醚二醇（PTMG）对环氧树脂进行改性，设计合成了高性能改性树脂作为成膜物，制备了复材用防护涂料。同时，进一步调控了涂料的颜基比，系统研究了涂层的耐候性、附着力、耐水性及阻燃性等性能。结果表明：当采用相对分子质量为 800和 2 000的 PTMG且二者质量比为 3∶2时，得到的改性树脂性能最佳。当涂料颜基比为 1. 1时，制备的涂层具有良好的耐环境适应性、耐水性，吸水率低至 0.6%，氧指数为 25. 8%，拉开法附着力可达 25. 33 MPa，能够为复合材料提供良好的防护能力，具有广阔的应用前景。

In order to improve the protective properties of carbon fiber/epoxy composites，reduce their water absorption，and prolong the service life of the composites，poly-tetrahydrofuran-ether-glycol（PTMG） with different relative molecular masses was used to modify epoxy resin，and a high-performance modified resin was designed and synthesized as a film-former，and protective coatings for composites were prepared. At the same time，the pigment/binder ratio of the coatings was further regulated，and the properties of the coatings such as weather resistance，adhesion，water resistance and flame retardant were systematically
studied. The results showed that when the mass ratio of PTMG with 800 molecular weight and PTMG with 2 000 molecular weight was 1. 5，the properties of the modified resin reached the best state. When the coating pigment/binder ratio was 1. 1，the prepared coating had good environmental resistance and water resistance，the water absorption rate was as low as 0. 6%，the oxygen index was 25. 8%，and the adhesion by pulling method could reach 25. 33 MPa， which could provide good protection ability for composite materials，and had broad application prospects.