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采用蓖麻油代替部分传统的石油类多元醇,二苯基甲烷-4,4′-二异氰酸酯(MDI)代替甲苯二异氰酸酯(TDI),并以碳酸二甲酯作为溶剂,研制了单组分湿固化聚氨酯胶粘剂。然后采用红外光谱法对胶膜进行表征,研究了蓖麻油的加入及R(—NCO/—OH)值对胶粘剂粘接强度的影响。研究结果表明:加入蓖麻油的胶粘剂不仅更环保低廉,而且也改善了聚氨酯胶粘剂的诸多性能;随着R值的增大,蓖麻油组聚氨酯胶粘剂的粘接强度先增大后减小,胶粘剂的吸水率逐渐减小,耐水性增强;当R=2.5时,蓖麻油组胶粘剂的粘接强度达到最大,拉伸强度达到5.229 MPa,断裂伸长率为247%,钢材剪切强度为3.245 MPa,木材剪切强度为3.098 MPa,PVC材料剪切强度为3.631 MPa。同时试验证明,蓖麻油组聚氨酯胶粘剂在耐低温、耐湿热方面都有良好表现。
Abstract:Castor oil was used to replace some traditional petroleum polyols,diphenylmethane-4, 4′-diisocyanate(MDI)was used to replace toluene diisocyanate(TDI),and dimethyl carbonate was used as solvent,one-component moisture-curing polyurethane adhesive was then prepared. The adhesive film was characterized by infrared spectroscopy,and the effects of castor oil addition and R(—NCO/—OH)value on bonding strength of adhesive were studied. The research results showed that the adhesive added with castor oil was not only more environmentally friendly and inexpensive,but also improved many performance of polyurethane adhesive. With the increase of R value,the bonding strength of castor oil group polyurethane adhesive first increased and then decreased,the water absorption of adhesive gradually decreased,and the water resistance increased. When R=2.5,the bonding strength of castor oil group adhesive reached the maximum,the tensile strength reached 5.229 MPa,the elongation at break was 247%,the shear strength of steel was 3.245 MPa,the shear strength of wood was3.098 MPa,and the shear strength of PVC material was 3.631 MPa. At the same time,the test showed that the castor oil group polyurethane adhesive had good performance in low temperature resistance and damp heat resistance.
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基本信息:
DOI:10.13416/j.ca.2022.06.011
中图分类号:TQ433.432
引用信息:
[1]刘运学,王宇佳,范兆荣等.环保型单组分聚氨酯胶粘剂的制备及性能研究[J].中国胶粘剂,2022,31(06):22-27.DOI:10.13416/j.ca.2022.06.011.
基金信息:
辽宁省教育厅项目(lnfw202014,LJKZ0593)