触控保护膜用聚氨酯压敏胶的制备及性能研究

Study on preparation and properties of polyurethane pressure sensitive adhesive for touch protective film

以聚醚三元醇、聚碳酸酯二元醇和六亚甲基二异氰酸酯(HDI)为原料,采用预聚体法合成了聚氨酯压敏胶。通过红外光谱对聚氨酯压敏胶进行了表征,并研究了聚碳酸酯二元醇分子量、R值和固化剂的用量对聚氨酯压敏胶性能的影响。研究结果表明:扩链反应在80℃下反应3.0 h,可使—NCO基团反应完全;聚碳酸酯二元醇分子量、R值的增大会导致聚氨酯压敏胶的黏度变大,剥离强度降低;增加固化剂的用量会使得压敏胶的剥离强度降低,耐湿热性能和润湿性会提升。使用分子量为1 000的聚碳酸酯二元醇进行扩链反应,当R值为0.8、固化剂质量分数为9%~10%时,得到的聚氨酯压敏胶低黏,耐湿热性能和润湿性优异,可满足触控保护膜领域的市场需求。

Polyurethane pressure sensitive adhesive was synthesized by the prepolymer method with polyether triol,polycarbonate diol and hexamethylene diisocyanate(HDI) as raw materials.The polyurethane pressure sensitive adhesive was characterized by infrared spectroscopy,and the effects of polycarbonate diol molecular weight,R value and the amount of curing agent on the properties of polyurethane pressure sensitive adhesives were studied as well.The research results showed that the —NCO group could be completely reacted by chain extension reaction at 80 ℃ for 3.0 h.The increase of molecular weight and R value of polycarbonate diol would lead to the increase of the viscosity of polyurethane pressure sensitive adhesive and the decrease of the peel strength.Increasing the amount of curing agent would reduce the peel strength of pressure sensitive adhesive,and improve the damp heat resistance and wettability.Polycarbonate diol with molecular weight of 1 000 was used for chain extension reaction,when R value was 0.8 and the mass fraction of curing agent was 9%-10%,the polyurethane pressure sensitive adhesive obtained had low viscosity,excellent damp heat resistance and wettability,which could meet the market demand in the field of touch protection film.