合成了一系列的自交联封端型聚氨酯- 丙烯酸酯( PUA) 复合乳液。合成步骤主要分为三步: ( 1) 运用无皂乳液聚合方法合成含羟基的PUA 复合乳液; ( 2)使用甲苯二异氰酸酯( TDI)、三元醇、2, 2- 二羟甲基丙酸( DMPA),分别使用不同的封端剂即甲乙酮肟(MEKO)和己内酰胺, 合成了一系列封端型水可分散交联剂; ( 3) 将第二步制得的交联剂, 按不同比例与第一步制得的PUA复合乳液在机械搅拌下共混, 制得了一系列的自交联封端型PUA复合乳液。此复合乳液低温成膜后, 升高至一定的温度, 随着解封交联反应的进行, 使涂膜达到了后固化交联的目的。通过DSC和TGA研究了不同封端剂和多元醇对解封交联温度的影响。同时对所合成的自交联封端型PUA复合乳液通过解封交联后固化制得的涂膜的力学性能进行了研究。

A series of aqueous blocked sel-f crosslinking hybrid polyurethane-acrylate ( PUA ) emu lsions has been synthesized in three steps: ( 1) synthesis of hydroxyl term inated PUA prepolymers by soap-free emulsion polym erization; ( 2) preparation of water-dispersib lemethylethyl ketoxime (MEKO ) and E-caprolactam blocked crosslinkers from to luene diisocyanate( TDI) , trihydricalcoho ls and DMPA; ( 3) a series of aqueous blocked sel-f crosslinking PUA emulsions are synthesized by mixing the resulted products ( 1) and( 2) at different ratio. The film s can be obtained from the emulsions by post-curing at h igh tempera tures.The emu lsions were characterized by differential scanning calorime try( DSC ) and thermogravimetric( TGA )analysis, and themechanical properties of the films have also been studied.