摘要： 为解决水性木器涂料涂装效率低的问题，首先构建了双键功能化 PVAc基核壳乳胶粒，然后通过预乳化将多活性单体（ TMPTA）在乳胶粒合成后期加入乳液，制备了 PVAc基光固化复合乳液，并对其稳定性、光固化性能和漆膜性能等进行了研究。结果表明：所制备的 PVAc基核壳乳胶粒壳层含有活性双键，且粒径远小于紫外光波长，可实现 UV固化；通过调控活性单体的加入量，可显著加快 PVAc基光固化复合乳液的成膜速度，应用于木器漆涂饰时，最快可在 20 s内完成固化；同时乳胶膜性能可调控，在活性单体 TMPTA与壳层双键的物质的量比为 3∶1时，光固化乳胶膜的力学性能最佳，其拉伸强度为 0. 91 MPa，断裂伸长率为 1. 29%，弹性模量为 70. 54 MPa；此外，木器涂料漆膜硬度、附着力、光泽和粗糙度分别为 4H、0级、 23. 7、1. 15 μm。所制备的 PVAc基光固化复合乳液将在水性木器涂料具有广阔的应用前景。

关键词: 水性木器涂料, 核壳结构乳液, 聚醋酸乙烯酯, 不对称双键, 紫外光固化

Abstract: Addressing the low painting efficiency of waterborne coatings，the PVAc-based core/shell latex functionalized with double bound groups was firstly fabricated bygrafting dipentene on shell surface of the latex. Then，the UV-curable composite emulsion wasprepared through adding pre-emulsified polyfunctional monomer（TMPTA）at the late stage of latex formation，aiming to accelerate the film-forming of the latex emulsion. The stability of its lotion，light curing properties，mechanical properties and film properties were studied. Theprepared PVAc-based core-shell latex can achieve UV-curing due to the grafting of activegroup combining with the small latex size within the UV wavelength range. By adjusting theamount of polyfunctional monomer，the film-forming of PVAc-based composite emulsion canbe significantly accelerated. Appling to wood coatings，UV curing can be achieved in as little as 20 seconds. At the same time，the property of composite emulsion film can be adjusted. When the double-bond ratio is 3∶1，the best mechanical properties of light-cured latex filmwere obtained with the tensile strength of 0. 91 MPa，elongation at break of 1. 29% and elastic modulus of 70. 54 MPa. In addition，the hardness，adhesion force，gloss and roughness of the wood coating film are 4H，0，23.7 and 1.15μm，respectively. The prepared PVAc-basedcomposite emulsion will have broad application prospects in waterborne wood coatings.

Key words: waterborne wood coatings, core-shell structure emulsion, polyvinyl acetate, asymmetric double bonds, UV curable

中图分类号: 

• TQ635. 3