摘要
对MMT(蒙脱土)进行酸化处理制备H-MMT,再将H-MMT以原位聚合的方式分阶段、分份量投入PF(酚醛)树脂合成体系,制备了H-MMT改性PF树脂胶粘剂,考察H-MMT投料时刻、投料比对胶粘剂性能的影响。研究结果表明:胶粘剂的游离甲醛含量、游离酚含量、固化时间随H-MMT投料比的增加呈先降后升的趋势,投料时刻对胶粘剂性能影响较大;第二阶段、1%投料比改性的PF树脂胶粘剂游离甲醛、游离酚含量分别为0.102%和1.24%,固化时间为423 s,综合性能良好;改性胶粘剂中蒙脱土片层可能以剥离或剥离与插层共存的状态分散在树脂体系中;H-MMT改性的PF树脂胶粘剂为高邻位结构树脂,树脂中含有大量的亚甲基和亚甲基醚键基团。
The acidification treatment of montmorillonite(H-MMT)was first carried out,and then the H-MMT modified phenol-formaldehyde(PF)resin adhesives were prepared by in-situ polymerization by adding H-MMT in stages and in portions into the PF resin synthesis system. The effects of feeding time and feeding ratio of H-MMT on performance of PF resin adhesives were investigated. The research results showed that the free formaldehyde content,free phenol content and curing time of the adhesive decreased firstly and then increased with the increasing of H-MMT feeding ratio,and the feeding time had significant influence on the performance of the adhesive. The second stage and the 1% feeding ratio of modified PF resin adhesive had good comprehensive performance,of which the free formaldehyde and free phenol content were 0.102% and 1.24% respectively,and the curing time was 423 s. The montmorillonite layer in the modified adhesive might be dispersed in the resin system in thestate of peeling or peeling and intercalation. The H-MMT modified PF resin adhesive was a highly ortho-structuredresin containing a large amount of methylene and methylene ether bond groups.
引文
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