单组分热固化聚氨酯涂料的合成及性能研究

摘要

以不同相对分子质量聚醚多元醇、甲苯二异氰酸酯、苯酚、2,2 ＇-二氯-3,3＇-二甲基4,4＇-二氨基二苯基甲烷等为主要原料合成了单组分热固化聚氨酯涂料,讨论了不同游离NCO含量、聚醚多元醇平均相对分子质量、扩链系数对涂膜的附着力、冲击强度、柔韧性、硬度、耐酸性、耐热性、耐低温性等各项性能的影响,同时研究了所合成涂料的贮存稳定性.结果表明,游离NCO质量分数在5％ ～6％、聚醚多元醇平均相对分子质量在600 ～700、扩链系数在0.85～0.90之间时,制得涂膜性能良好,涂料贮存稳定性好,使用方便.%One component heat-cured polyurethane coating was synthesized with polyether polyols which had different molecular mass and toluene diisocyanate as initial materials, phenol as end-blocking agent and 2,2'-dichl-loro-3 ,3'-dimethyl-4,4'-diaminodiphenylmethane as chain extender. The effects of mass content of free NCO,average molecular weight of polyether polyols and chain extension coefficient on the adhesion, impact strength, flexibility, hardness, acid resistance, heat resistance, low-temperature resistance properties of the coating film and the storage stability of the coating were investigated. The results showed that, when the mass content of free NCO was 5% -6% , average molecular mass of polyether polyols was 600 -700 and chain extension coefficient was 0. 85 ~ 0. 90, properties of the film was relatively perfect and the storage stability of the coating was good and was convenient to be uscd.