羟基硅油改性丙烯酸树脂水分散体的制备与性能

Preparation and properties of waterborne acrylic resin modification by hydroxylterminated poly (dimethysiloxane)

摘要:

以羟基硅油（PDMS-OH）、甲基丙烯酸羟丙酯（HMPA）、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与丙烯酸酯在丙二醇甲醚醋酸酯（PMA）中，以偶氮二异丁氰（AIBN）为引发剂，合成了含硅改性丙烯酸树脂。N，N-二甲基乙醇胺中和含硅改性丙烯酸树脂，加水乳化制备了含硅改性丙烯酸树脂水分散体。采用FTIR、XPS、TGA、AFM、SEM等仪器对水分散体和漆膜进行了表征，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含量为含硅改性丙烯酸树脂量的4%时，树脂水分散体的粒径为208.57nm，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15.6MPa，断裂伸长率为356%；热失重分析表明，漆膜失重率10%时热分解温度可达到302.4℃。

Abstract:

Silicone-containing acrylate pre-polymer (PDMS-g-HPMA) was prepared from hydroxylterminated poly (dimethysiloxane)(PDMS-OH), hydroxypropyl methacrylate (HPMA), 3-Isocyanatomethyl-3,5,5-trimerhylcyclohexy isocyanate (IPDI). Then, a series of silicone-containing modified acrylic resin polymers 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. Last, a series of waterborne acrylic resin dispersions were prepared by emulsification with N,N-dimethylethanolamine as neutralizer in the presence of water. The dispersions and coatings were characterized by FTIR, XPS, TGA, AFM and SEM. And the storage stability of the dispersions, the hardness, adhesion, water resistance and other properties of the coatings were test. The results showed that when PDMS-g-HPMA content was 4% (based on the total mass of polymerized monomers, the same below), the prepared dispersion had evenly distributed, right particle size (208.57nm) and better storage stability. The prepared coating had dense, transparent surface and exhibited good properties. The coating’s hardness was H, adhesion was grade 1 and water contact angle was 100.5?. Moreover, the prepared coating had excellent water and acid resistance.And the tensile strength of the coating was 15.6MPa and elongation at break reached 356%.The TGA analysis demonstrated that the temperature at which 10% mass loss of the coating reached 302.4℃.