大粒径自消光核-壳丙烯酸树脂涂饰剂的合成与表征  

Synthesisand characterization of large-diameterself-matting core-shell acrylic resin coating

作　　者：彭豪 魏欢[1] 向均[1] 陈意[1] 范浩军[1,2] PENG Hao;WEI Huan;XIANG Jun;CHEN Yi;FAN Haojun(Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University,Chengdu 610065, China;State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China)

机构地区：[1]四川大学皮革化学与工程教育部实验室,成都610065 [2]四川大学高分子材料工程国家重点实验室,成都610065

出　　处：《功能材料》2022年第3期3001-3010,3019,共11页Journal of Functional Materials

基　　金：山东省重点研发计划(重大科技创新工程)项目(2019JZZY010355);清远市创新创业团队项目(清科〔2018〕31号)。

摘　　要：以半连续投料法,通过种子乳液聚合-三次连续核长大-壳聚合的方式制备了具有核-壳结构、大粒径自消光丙烯酸树脂乳液。研究了不同投料方式对种子乳胶粒粒径的影响,探索了乳胶粒粒径连续长大的方法,同时还研究了乳胶粒粒径、乳胶粒的核-壳结构以及交联度等因素对丙烯酸树脂涂层消光性能的影响。结果表明,半连续法投料方式能够得到较大粒径的种子乳胶粒,控制乳化剂浓度和单体浓度使得种子乳液聚合遵循低聚物成核机理,并且反应中乳胶粒长大占据主导,从而得到大粒径的种子乳胶粒(200 nm左右)。种子乳胶粒经过3次长大后,粒径可达到700 nm左右,最后经过壳聚合反应,核-壳乳胶粒粒径进一步增大至800 nm左右。不同乳胶粒粒径、核-壳结构、交联度对涂层光泽产生重要影响,大的乳胶粒粒径使得涂层产生球形粒子状微粗糙表面,涂层光泽度降低;软核-硬壳结构导致成膜时乳胶粒变形困难,也可提高涂层表面粗糙度和消光度;壳层交联使得壳层结构致密度上升,自由度降低,乳胶粒难以变形和融合,涂层粗糙度进一步提高,光泽度进一步降低,最终所制备的皮革涂层光泽度可调控至1.2°。A core shell structure,large particle self-extinction acrylic resin emulsion is prepared by semi continuous feeding method through seed emulsion polymerization-three successive nucleation growth and shell polymerization.The effects of different feeding methods on the particle size of seed latex particles and the method of continuous growth of core latex particles are investigated.Simultaneously,the influence of latex particle size,core-shell structure and crosslinking degree on the extinction of acrylic resin coating is also studied.The results show that the seed latex particles with large particle size can be obtained by semi-continuous feeding method.By controlling the concentration of emulsifier and monomer,the nucleation mechanism is oligomer nucleation,and the growth of latex particles is dominant in the reaction,so as to obtain the seed latex particles with large particle size(about 200 nm).After three times growth,the particle size of seed latex particles can reach about 700 nm.Finally,after shell-shell polymerization,the particle size of core-shell latex is increased to about 800 nm.Latex particle size has an important influence on the gloss of the coating.Large latex particle size will produce rough microstructure on the coating surface and reduce the gloss of the coating,while the soft core-hard shell structure makes it difficult for latex particles to deform and integrate during film formation,leading to improve the roughness and extinction of the coating.At the same time,the shell density is also an important factor affecting the gloss of coating.After the introduction of crosslinking agent,the density of shell structure increases and the degree of freedom of polymer chains decreases,which retards the latex particles deform and fuse.As a result,the roughness of the coating surface is further increased,and the gloss of the PVC leather coating can be adjusted to 1.2°.

关 键 词：丙烯酸树脂 大粒径 乳胶粒 核-壳结构 涂层消光 

分 类 号：TQ331.47[化学工程—橡胶工业] TQ325.7