为了获得低吸水率的防火涂层，合成了含磷苯并噁嗪，并将其用于制备环氧丙烯酸酯涂料，以 LED-385 nm为光源对涂料进行光固化，研究了涂层的防火性能、附着力、铅笔硬度、耐酸碱性和耐水性。为了降低防火涂层中含磷元素的用量，同时保持涂层的防火性能，在上述体系中引入了盐酸多巴胺，并在此基础上探索了磷氮协同作用对涂层性能的影响。结果表明： 2种含磷苯并噁嗪衍生物（ DPOBH和 DOPOBH）中， DPOBH对涂层防火性能、附着力和硬度的提升作用优于 DOPOBH。添加 3.7%DPOBH的涂层（ EA/DPOBH_{3. 7}）的 UL-94为 V-0等级，硬度为 B，附着力为 1级，酸质量损失率仅为 0. 40%，碱质量损失率为 2. 13%，吸水率仅为 0. 82%。添加 0. 5%盐酸多巴胺所得涂层（EA/DPOBH_{3. 5}-N_{0. 5}）的 UL-94为 V-0等级，硬度为 2H，附着力为 1级，耐酸碱性提升。综上可知，在含磷苯并噁嗪环氧丙烯酸酯光固化涂层中磷氮协同作用可有效提升环氧丙烯酸酯涂层的防火性能和耐酸碱性能，降低吸水率。

In order to obtain the coating with low water absorption and fire retardant，phosphorus-containing benzoxazine was synthesized and used in UV-LED curable epoxy acrylate coating with LED-385 nm as the light source. The flame retardancy，adhesion，pencil hardness，acid/alkali resistance and water resistance of the coating were studied. To reduce the amount of phosphorus in the fire retardant coating and maintained the flame retardancy，dopamine hydrochloride was introduced into the above system and the synergistic effect of phosphorus and nitrogen on the performance of the coating was explored. The results showed that among the two phosphorus-containing benzoxazine derivatives（DPOBH and DOPOBH），DPOBH exhibited better promotional effects on the flame retardancy，adhesion and hardness of the coatings than DOPOBH. The coating with 3. 7% DPOBH（EA/DPOBH_{3. 7}） exhibited a UL-94 fire retardant rating of V-0 level，a hardness of B grade，an adhesion of 1 grade，an acid mass loss of only 0. 40%，an alkali mass loss of 2. 13%，and a water absorption of only 0. 82%. On this basis，the synergetic effect of phosphorus and nitrogen on the properties of coatings wasexplored. The results showed that the UL-94 flame retardant rating of V-0 was gained with byadding 0. 5% dopamine hydrochloride（EA/DPOBH_{3. 5}-N_{0. 5}）. The hardness of 2H，the adhesion of 1，and improved acid/alkali resistance are obtained with EA/DPOBH3. 5-N0. 5. In conclusion， phosphorus-containing benzoxazine could effectively improve the flame retardancy and acid/alkali resistance and reduce water absorption of epoxy acrylate coating.