摘要
以羟基硅油(PDMS-OH)、甲基丙烯酸-2-羟丙酯(HPMA)、异佛尔酮二异氰酸酯(IPDI)合成了含硅丙烯酸酯预聚体(PDMS-g-HPMA),PDMS-g-HPMA与丙烯酸酯单体在丙二醇甲醚醋酸酯(PMA)中,以偶氮二异丁腈(AIBN)为引发剂,合成了含硅改性丙烯酸树脂。用N,N-二甲基乙醇胺中和含硅改性丙烯酸树脂,加水乳化后制备了含硅改性丙烯酸树脂水分散体。采用FTIR、XPS、TGA、AFM、SEM等对水分散体和漆膜进行结构表征,测试了水分散体粒径、储存稳定性和漆膜综合性能。当PDMS-g-HPMA含量为聚合单体总质量的4%时,树脂水分散体的粒径为208.57 nm,且分布均匀,储存稳定性好;漆膜表面致密、透明,硬度为H,附着力1级,对水接触角达到100.5°,有良好的耐水耐酸性;漆膜的拉伸强度达到15.6 MPa,断裂伸长率为356%;漆膜失重率10%时的热分解温度可达到302.4℃。漆膜的力学性能和热稳定性能均有所提升。
Silicone-containing acrylate pre-polymer(PDMS-g-HPMA) was prepared from hydroxyl-terminated polydimethysiloxane(PDMS-OH), 2-hydroxypropyl methacrylate(HPMA), 3-isocyanatomethyl-3,5,5-trimerhylcyclohexy isocyanate(IPDI). Then, a series of silicone-containing modified acrylic resins with different content of PDMS-g-HPMA were prepared with 2-acetoxy-1-methoxypropane(PMA) as solvent and 2,2-azobis(2-methylpropionitrile)(AIBN) as initiator. Subsequently, the silica-containing modified acrylic resins were neutralized with N,N-dimethylethanolamine and emulsified with water to prepare the aqueous dispersions of silica-containing modified acrylic resins. The dispersions and coatings were characterized by FTIR, XPS, TGA, AFM and SEM. The particle size and storage stability of the dispersions and comprehensive properties of the coatings were tested. The results showed that when PDMS-g-HPMA content was 4%(based on the total mass of silicone-containing modified acrylic resin, the same below), the prepared dispersion had even distribution with particle size of 208.57 nm and good storage stability. The prepared coating had dense and transparent surface and exhibited good properties. The hardness was H, adhesion was grade 1 and water contact angle was 100.5°. Moreover, it had excellent water and acid resistance. And the tensile strength of the coating was 15.6 MPa and elongation at break reached 356%. The temperature at which the mass loss is 10% of the coating reached 302.4 ℃. The mechanical properties and thermal stability of the coating had been improved.
作者
赵晓圳
麦颖
张志敏
王锋
胡建青
涂伟萍
ZHAO Xiaozhen;MAI Ying;ZHANG Zhimin;WANG Feng;HU Jianqing;TU Weiping(School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510630,Guangdong,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2021年第6期1257-1263,共7页
Fine Chemicals
基金
广东省自然科学基金(2015A030313207)
广东省公益研究与能力建设项目(2015A010105004,2015A010105023)
广东省绿色化学产品技术重点实验室开放基金项目(GC201601)。
关键词
羟基硅油
丙烯酸树脂
水分散体
耐水耐酸
丙烯酸系列化学品
hydroxyl-terminated polydimethysiloxane
acrylate resin
aqueous dispersion
water and acid resistance
acrylic series chemicals
