采用多亚甲基多苯基异氰酸酯、聚醚多元醇、扩链剂或交联剂为原料，研制出了A、R双组分无溶剂喷涂型聚氨酯管道补口涂料。讨论了催化剂对凝胶时间的影响，以及A组分中NCO含量、扩链剂或交联剂对涂层性能的影响，同时还对两组分的贮存稳定性进行了研究。结果表明，A组分中NCO含量增加，涂层硬度提高，综合性能也相对提高，但NCO含量过高，柔韧性降低；二乙醇胺和甘油作为扩链剂或交联剂制得的涂层其综合性能高于1，4-丁二醇；所研制的管道补口涂料具有良好的综合性能，能够满足管道补口防腐要求。%A and R two components solvent-free spray PU field joint coating was prepared from polymethylene polyphenlene isocyanate, polyether polyols, fillers and polyol chain-extender or crosslinker. The effects of gel time, NCO contents in component A, different types of chain-extender or crosslinker on the properties of coating were dis-cussed,and the storage stability of the two components was studied. The results show that, as NCO contents in com-ponent A increasing, the hardness and comprehensive performance of coating increasd. The comprehensive per-formance of coating with diethanol amine and glycerin as chain-extender or crosslinker was better than that with 1,4-butanediol. The coating had excellent comprehensive performance, which could meet the requirements on field joint anticorrosion.
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