水性紫外光固化合成革用聚氨酯丙烯酸酯树脂的合成及性能研究

Preparation and Characterization of UV-Curable Waterborne Polyurethane Acrylic Resin Used for Synthetic Leather

采用聚丁二醇(PBG)、2,4-甲苯二异氰酸酯、二羟甲基丙酸(DMPA)和丙烯酸羟乙酯合成了紫外光固化水性聚氨酯丙烯酸酯树脂,利用FT-IR对树脂进行了表征,探讨了树脂亲水基团含量和中和度对乳液性能的影响,分析表征了固化膜的基本性能。结果表明:乳液的粒径随着—COOH含量的提高而下降,乳液的分散性、稳定性及黏度随—COOH含量增加而增大;乳液黏度在中和度为90%时达到最高6.222 mPa.s,粒径达到最小59.8 nm。固化膜的吸水率随—COOH含量的增加而上升,固化膜对PVC板具有很好的附着力,其铅笔硬度随着DMPA/PBG比例的增加而上升。

An UV - curable waterborne polyurethane acrylic resin has been synthesized from polybutylene glyeol（PBG）, toluene diisocyanate （TDI）, dimethylol propionie acid （DMPA） and hydroxyethyl acl^clate （HEA）. The resin was characterized by FT - IR analysis. The effects of the content of hydrophilic group and neutralization degree on emulsion properties were discussed, and physical properties of cured film were also characterized. The results showed that with the increase of the --COOH content, the emulsion granular- ity decreased, while the dispersion, stability and viscosity of the emulsion increased. When the neutralization degree was 90%, the viscosity of the emulsion hit up to a maximum value of 6. 222 mPa·s, and the particle size down to a minimum value of 59. 8nm. The water absorption of the cured film increased with the increase of the --COOH content. The cured film showed a good adhesion on PVC board, and the pencil hardness increased with the increase of the molar proportion of DMPA/PBG.