聚氨酯丙烯酸酯预聚体的合成与性能研究

合成了聚氨酯丙烯酸酯预聚体,配制了紫外光固化胶粘剂,研究了预聚体含量和种类对紫外光固化胶粘剂固化膜性能的影响。确定了预聚体合成的最佳条件为：反应温度75-80℃、催化剂用量0.45%左右。预聚体在胶粘剂配方中的最佳含量为50%-60%;芳香族预聚体剪切强度明显高于脂肪族预聚体,但胶层较硬,韧性较差;脂肪族预聚体柔顺性较好,180°剥离强度和附着力高于芳香族预聚体;不挥发物含量越高则固化得越完全,综合强度越好;芳香族预聚体的玻璃化温度高于脂肪族预聚体,二者分别贡献胶粘剂固化膜的剪切强度和剥离强度。

Synthesis and Properties of Polyurethane Acrylate Prepolymer

Polyurethane acrylate prepolymer was synthesized under the optimal conditions as follows.reac- tion temperature of 75-80℃ ,catalyst dosage of about 0.45%. The effects of prepolymer＇content and type on cured film performance were studied. The optimum prepolymer content in the formula of adhesive was 50%-60%. The results showed that aromatic prepolymer had significantly higher shear strength than aliphatic pre-polymer,but its adhesive layer was harder with lower toughness,aliphatic prepolymer had nice flexility with higher 180 ° peel strength and adhesion than aromatic prepolymer, the higher the nonvolatile matter content, the more completely it cured and the better the comprehensive strength it had ,glass transition temperature of aro- matic prepolymer was higher than that of aliphatic prepolymer,and aromatic and aliphatic polyurethane respec- tively contributed shear strength and peel strength for the cured film of adhesive.