【作者】 林兴； 苏佳琦； 张许静； 谭朝珍； 王春钰； 韦双颖；

【Author】 LIN Xing;SU Jiaqi;ZHANG Xujing;TAN Chaozhen;WANG Chunyu;WEI Shuang-ying;Material Science and Engineering College,Northeast Forestry University;Key Laboratory of Bio-basedMaterial Science and Technology,Northeast Forestry University;

【机构】 东北林业大学材料科学与工程学院； 东北林业大学生物质材料科学与技术教育部重点实验室；

【摘要】 用硅溶胶改性、紫外光固化构成的体系,弥补水性纯丙烯酸酯木器涂料力学性能不佳、硬度较低、固化速度较慢的缺陷。通过将具有环氧基团的KH-560硅溶胶引入带有活泼羟基的水性聚丙烯酸酯乳液中,以提高水性聚丙烯酸酯膜的力学性能及附着力;进而通过调控功能性单体季戊四醇三丙烯酸酯(PETA)的添加量制得紫外光固化硅溶胶改性水性聚丙烯酸酯木器涂料。研究了不同水性聚丙烯酸酯乳液配方对漆膜、涂膜固化速度及性能的影响。硅溶胶含量为10%,PETA含量为12%时,制备的硅溶胶改性水性聚丙烯酸酯分散体具有良好的贮存稳定性,且90 d内无沉淀分层现象,乳液有效粒径为250 nm,固含量达到44.98%,紫外光固化涂膜玻璃化转变温度为21.78℃,拉伸强度为21.98 MPa,断裂伸长率为31.5%,凝胶率为92.62%,漆膜紫外光固化时间10 s,硬度达到3 H,附着力达到1级。与传统水性纯丙烯酸酯体系相比,紫外光固化硅溶胶改性聚丙烯酸酯体系制得的漆膜力学性能优异,硬度较高,固化速度明显提高。更多还原

【Abstract】 Modified by silica sol,the UV cured waterborne pure polyacrylate(PA) wood coating was developed in this work,whichcan address the drawbacks of traditional wood coatings,such as unsatisfactory mechanical properties,low hardness and slow curingrate.The mechanical properties and adhesion of waterborne polyacrylate film could be improved by introducing KH-560 silica solwith epoxy group into aqueous polyacrylate emulsion with active hydroxyl groups.Furthermore,the UV cured waterbornepolyacrylate wood coatings modified by silica sol were synthesized by adjusting the loading of functional monomer pentaerythritolthree acrylate(PETA).The effects of different waterborne polyacrylate emulsion formulations on the curing rate and properties of filmwere characterized.The results showed that the PA had good storage stability with no precipitation and delamination within 60 d with10 wt% silica sol and 12 wt% PETA.The effective particle size of the emulsion was 280 nm and the solid content reached44.98%.Theglass transition temperature of the UV cured coating was 21.78℃,the tensile strength was 21.98 MPa,the elongation at break was31.5% and the gelation rate was 92.62%.The UV curing time,hardness and adhesion of the paint film were10 s,3 H and 1 st grade,respectively.The UV cured waterborne polyacrylate film modified by silica sol had excellent mechanical properties,higher hardnessand faster curing speed compared with the traditional waterborne pure polyacrylate system.With the improvement of people’sconsciousness of environmental protection and the progress of water-borne wood coatings preparation technology,solvent-basedcoatings with high VOC have been phased out.Water-borne coatings have become the mainstream trend in the development of woodcoatings due to their less VOC and less pollution.The UV curing method can improve the curing speed of coatings,greatly improveproduction efficiency and reduce production costs in the factory production and processing,and waterborne coatings are themainstream trend of environmental protection coatings.The UV curing water-borne wood coatings have good development prospects.Silica sol was added to traditional polyacrylate system and functional monomer PETA was added to make the coatings with goodmechanical performance and hardness while maintaining very low VOCs.After the coating was cured rapidly under UV light,it canform high quality appearance and adapt to diversified products,thus solving the problems of the water-borne pure polyacrylate system,such as poor mechanical properties,low hardness and slow curing speed.更多还原