聚醋酸乙烯酯基光固化核壳乳液的合成及其在水性木器涂料中的应用  

Synthesis of Photocuring PVAc-based Core-shell Emulsion and Its Application in Waterborne Wood Coatings

作　　者：聂金秋 李欢欢 范晓慧 李志国[1] NIE Jinqiu;LI Huanhuan;FAN Xiaohui;LI Zhiguo(Material Science and Engineering College,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学材料科学与工程学院,哈尔滨150040

出　　处：《涂料工业》2024年第6期22-28,共7页Paint & Coatings Industry

基　　金：国家自然科学基金(32171695)。

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、1.15μm。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。Addressing the low painting efficiency of waterborne coatings,the PVAc-based core/shell latex functionalized with double bound groups was firstly fabricated by grafting dipentene on shell surface of the latex.Then,the UV-curable composite emulsion was prepared 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.The prepared PVAc-based core-shell latex can achieve UV-curing due to the grafting of active group combining with the small latex size within the UV wavelength range.By adjusting the amount of polyfunctional monomer,the film-forming of PVAc-based composite emulsion can be 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 film were 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-based composite emulsion will have broad application prospects in waterborne wood coatings.

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 

分 类 号：TQ635.3[化学工程—精细化工]