无溶剂型室温固化双组分聚氨酯胶粘剂的制备及应用

以蓖麻油、3,3’-二氯-4,4’-二氨基-二苯基甲烷(MOCA)、填料等为甲组分,蓖麻油、甲苯二异氰酸酯(TDI)合成乙组分,制备了无溶剂型室温固化双组分聚氨酯胶粘剂。考察了甲组分中MOCA含量对胶粘剂固化时间的影响,以及该胶粘剂的甲乙组分质量比、填料品种、硅烷偶联剂及浸水处理对铝合金和硫化天然橡胶胶接性能的影响,并进行热失重分析。结果表明,当MOCA质量分数为甲组分的3%、m甲/m乙为10∶3、填料为400目CaCO3时,铝合金和硫化天然橡胶表面用0.5%的KH-550乙醇溶液处理后,胶接性能和耐水性较好,胶膜的初始热分解温度大于200℃,可以满足高速列车车厢的橡胶地板与铝合金底板的粘结。

The Preparation and Application of Solvent-Free Two-Component PU Adhesive Cured at Room Temperature

A solvent-free two-component polyurethane adhesive which was cured at room temperature was prepared in this test. The component A was obtained from castor oil, 4,4-methylene bis （2-chloroaniline） （MOCA） and filler. The component B was synthesized from castor oil and 2,4-diisocyanatotoluene （TDI）. The effect of MOCA content on adhesive curing time was researched. The effect of technical factors on aluminum alloy （AA） and vulcanized natural rubber （VNR） bonding property was studied, including component A and B mass ratio, filler type, silane coupling agent and soaking treatment. The results indicated that the best bonding performance of AA and VNR was achieved when the amount of MOCA was 3% ,mA/mB was 10：3, using 400 mesh CaCO3 as the filler, AA and VNR were pretreated with KH-550 （0.5% in ethanol solution）. The result of TGA indicated that the adhesive film had a starting decomposition temperature of 200 ℃, which could meet the condition using in bullet train carriage.