动力电池用双组分聚氨酯灌封胶的制备与性能研究  

Preparation and properties of two-component polyurethane potting adhesive for power battery

作　　者：陈权 王超智 王小伟 潘守伟 Chen Quan;Wang Chaozhi;Wang Xiaowei;Pan Shouwei(Guangzhou Jointas Chemical Co.,Ltd.,Guangzhou 510665,Guangdong,China)

机构地区：[1]广州集泰化工股份有限公司,广东广州510665

出　　处：《中国胶粘剂》2023年第12期14-18,共5页China Adhesives

摘　　要：以蓖麻油多元醇、聚醚三元醇、聚醚二元醇、多亚甲基多苯基多异氰酸酯(PAPI)及二苯基甲烷二异氰酸酯(MDI)为原料制备了聚氨酯预聚体,以蓖麻油多元醇、聚醚三元醇N303、聚醚二元醇N220等制备了A组分,以聚氨酯预聚体、MDI-50、稀释剂等制备B组分。然后A、B组分按质量比5∶1的比例混合,制备了聚氨酯灌封胶。探究了多元醇不同配比、不同多元醇合成的预聚体、异氰酸酯不同配比、氢氧化铝粒径及填充量对双组分聚氨酯灌封胶性能的影响。研究结果表明:A组分蓖麻油多元醇(CO)、聚醚N303、聚醚N220按照m(CO)∶m(N303)∶m(N220)=2∶1∶2时,灌封胶具有较优的力学性能;B组分以蓖麻油多元醇合成的聚氨酯预聚体制备的灌封胶具有更好的韧性及力学性能,拉伸强度可达6.7 MPa,断裂伸长率可达66%,剪切强度可达6.2 MPa;当B组分异氰酸酯(CO-PU)和MDI-50按质量比1∶1混合时,灌封胶的力学性能、可操作时间、硬度之间可达到较好的平衡;在氢氧化铝的复配比例m(5μm氢氧化铝)∶m(20μm氢氧化铝)=1∶4,填充总质量分数为60%时,聚氨酯灌封胶的黏度及拉伸强度均较优异,阻燃等级达到UL94 V0,导热系数为0.80 W(/m·K)。Polyurethane prepolymers were prepared by using castor oil polyols,polyether triols,polyether diols,polymethylene polyphenyl polyisocyanates(PAPI)and diphenylmethane diisocyanate(MDI)as raw materials.Component A was prepared by using castor oil polyol,polyether triol N303,polyether diol N220,etc.Component B was prepared with polyurethane prepolymer,MDI-50,diluent,etc.Then,components A and B were mixed in the mass ratio of 5∶1 to prepare polyurethane potting adhesive.The effects of different ratios of polyols,prepolymers synthesized from different polyols,different ratios of isocyanates,aluminum hydroxide particle size and filling amount on the performance of two-component polyurethane potting adhesive were explored.The research results showed that the potting adhesive had excellent mechanical properties when the ratio of castor oil(CO),polyether N303 and polyether N220 was m(CO)∶m(N303)∶m(N220)=2∶1∶2 in component A.The potting adhesive prepared by polyurethane prepolymer synthesized with castor oil in component B had better toughness and mechanical properties,with the tensile strength reaching 6.7 MPa,the elongation at break reaching 66%,and the shear strength reaching 6.2 MPa.When isocyanates(CO-PU)and MDI−50 were mixed in the mass ratio of 1∶1 in component B,the good balance could be achieved between the mechanical properties,operation time,and hardness of the potting adhesive.In the compounding ratio of m(5μm aluminum hydroxide)∶m(20μm aluminum hydroxide)=1∶4,and the total mass fraction of the filling was 60%,the viscosity and tensile strength of the polyurethane potting adhesive were excellent,with the flame retardant grade of UL94 V0 and the thermal conductivity of 0.80 W(/m·K).

关 键 词：双组分聚氨酯 灌封胶 阻燃 导热系数 

分 类 号：TQ436.6[化学工程]