水性苯丙共聚物改性醇酸树脂的制备及性能

Preparation and properties of water-based styrene-acrylic copolymer modified alkyd resin

摘要:

以油酸、季戊四醇、邻苯二甲酸酐、苯甲酸为原料，采用丙二醇甲醚醋酸酯（PMA）为溶剂合成了基体醇酸树脂；用过氧化苯甲酰、过氧化苯甲酸叔丁酯双引发剂、分步引发烯类单体共聚，制备了一种苯丙烯树脂，并对醇酸树脂改性制得了水性醇酸树脂。考察了不同油度对水性醇酸树脂结构与性能的影响。通过FTIR、TGA、DLS分别对树脂的结构、稳定性和乳液性能进行了表征。测定了树脂的漆膜性能，包括耐水性、表干时间、硬度、电化学性能。结果表明，n（油酸）∶n（季戊四醇）∶n(邻苯二甲酸酐)∶n（苯甲酸）=1∶1∶1∶0.3，油度为47%时，聚合物乳液粒径为74.4 nm，PDI为0.262，胶膜的吸水率为14.5%，接触角为70.87?，有较好的耐水性。改性醇酸树脂的表干时间缩短为0.5 h，实干时间缩短为24 h，硬度达HB。

Abstract:

A matrix alkyd resin was synthesized using oleic acid, pentaerythritol, phthalic anhydride, and benzoic acid as raw materials and propylene glycol methyl ether acetate (PMA) as a solvent; benzoyl peroxide ana tert-butyl peroxybenzoate double initiators were used to initiate the copolymerization of olefin monomers in steps to prepared. A styrene-acrylic resin was modified and a water-based alkyd resin was prepared. The effects of different oil degrees on the structure and properties of water-based alkyd resins were studied. The structure, stability and emulsion properties of the resin were characterized by Fourier transform infrared spectroscopy (FTIR), thermal weight loss (TGA), and laser particle size scattering (DLS). The film properties of the resin were measured, including water resistance, surface drying time, hardness, salt spray resistance, and electrochemical properties. The results show that when the molar ratio of oleic acid: pentaerythritol: terephthalic anhydride: benzoic acid is 1: 1: 1: 0.3 mol and the oil degree is 47%, the particle size of the polymer emulsion is 74.4 nm, and the PDI is 0.262. The water absorption of the film is 14.5%, the contact angle is 70.87 ?, and has good water resistance. The surface drying time of the modified alkyd resin is shortened to 0.5 h. The dry time of the modified alkyd resin is shortened to 24 h, and the hardness reaches HB.