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以甲苯二异氰酸酯(TDI)、支化聚酯/聚醚多元醇等为主要原料,制备了端-NCO支化聚酯/聚醚;然后以此为环氧树脂(EP)的增韧改性剂,制备端-NCO支化聚酯/聚醚改性EP底涂剂。研究了R值[即R=n(-NCO)/n(-OH)]、硅烷偶联剂用量等对该底涂剂的粘接性能、表干时间、耐水性能和冲击性能等影响。结果表明:当R值为2.0、w(硅烷偶联剂)=2%时,该底涂剂的综合性能相对最好;此时底涂剂的表干时间(3.0 min)相对最短、底涂剂与基材之间的粘接强度(>3 MPa)相对最高且耐水性能(浸水后粘接强度降幅仅为4.68%)相对最好。
An end-NCO branched polyester / polyether was prepared with toluene diisocyanate (TDI), branched polyester / polyether polyol as the main raw material, and then toughened with epoxy resin (EP) Preparation, preparation end -NCO branched polyester / polyether modified EP primer. The effects of R value [ie R = n (-NCO) / n (-OH)], the amount of silane coupling agent, etc. on the adhesion performance, surface dry time, water resistance and impact performance of the primer were investigated. The results show that when the value of R is 2.0 and w (silane coupling agent) is 2%, the overall performance of the primer is the best. At this time, the primer dry time (3.0 min) The bonding strength between the agent and the substrate (> 3 MPa) is relatively highest and the water resistance (the reduction in bond strength after immersion is only 4.68%) is relatively good.