单组分热固化聚氨酯涂料的合成及性能研究

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。

Study on the Synthesis and Property of One Component Heat-Cured Polyurethane Coating

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 ,aver- age molecular weight of polyether polyols and chain extension coefficient on the adhesion, impact strength, flexibil- ity, 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 conven- ient to be used.