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为进一步提高淀粉胶粘剂的耐水性能,在传统脲醛树脂(UF)和淀粉胶粘剂合成工艺的基础上,以环氧氯丙烷(ECH)作为UF的接枝共聚改性剂,制备环氧型UF;然后将环氧型UF与传统淀粉胶粘剂进行复配,制备改性淀粉胶粘剂。以耐水剪切强度作为考核指标,采用正交试验法优选出制备改性UF的较佳工艺条件。结果表明:当n(F)∶n(U)=2.0∶1、m(ECH)=8 g、缩聚温度为90℃和接枝共聚时间为75 min时,制成的改性UF可明显提高复配淀粉胶粘剂的耐水性能。
In order to further improve the water resistance of starch adhesive, epoxy-type UF was prepared by using epichlorohydrin (ECH) as graft copolymerization modifier of UF on the basis of the synthetic process of UF and starch adhesive. The epoxy type UF and traditional starch adhesive compound, preparation of modified starch adhesive. Taking water-resistant shear strength as the evaluation index, the optimum technological conditions for preparation of modified UF were optimized by orthogonal test. The results show that the modified UF can be obviously improved when n (F): n (U) = 2.0:1, m (ECH) = 8 g, polycondensation temperature is 90 ℃ and graft copolymerization time is 75 min Water resistance of compound starch adhesive.