有机硅改性聚氨酯胶粘剂的研究

Polyurethane Adhesives Modified by Polysilicone

目的合成一种抗水性良好的无溶剂聚氨酯胶粘剂。方法采用聚酯多元醇(PBA)、异佛尔酮二异氰酸酯(IPDI)、蓖麻油和羟基硅油为原料,合成出一系列有机硅改性聚氨酯胶粘剂,并用红外光谱分析仪、热重分析仪对反应产物进行分析。同时考察不同羟基硅油的添加量对胶粘剂固化时间、固化膜吸水性、粘结性能等的影响。结果适量添加羟基硅油可以有效提高胶粘剂的粘接强度、耐热性和耐水性,但是羟基硅油添加量过多会延长预聚体的合成时间。结论羟基硅油添加的质量分数为3%～4%时最佳。

Objective To synthesize a solvent-free polyurethane adhesive with high water resistance. Methods A series of polyurethane adhesives modified by polysilicone were synthesized using PBA, IPDI, castor oil and hydroxy silicone oil as materials. The chemical structure was characterized by FT-IR analysis and thermogravimetric analysis. Influences of different ratios of polysilcone on curing time, adhesion strength and water resistance were well discussed. Results The addition of proper amount of polysilicone could enhance the bonding strength, thermostability and water resistance. But overdose of polysilicone prolonged the reaction time of the pre-polymer. Conclusion The content of polysilicone should be controlled within 3%--4%.