Study on Synthesis and Properties of Crosslinking Oxidized Starch Adhesive

Firstly,a kind of oxidized starch with low degree of substitution was prepared by oxidation of soluble starch with potassium perman ganate via crosslinking oxidation;then the crosslinking oxidized starch base resin was synthesized by crosslinking reaction with glutaraldehyde;at last,a kind of carbamic ester cross-linking oxidized starch adhesive was prepared by adding toluene diisocynate(TDI)at a high temperature with no water.The mechanism of preparing crosslinking oxidized starch adhesive and affecting factors were discussed.And the products were characterized by IR and SEM.Their properties were also tested.The results showed the degree of oxidization had an effect on the bonding properties,and the oxidized starch with low degree of substitution had a better bonding property,and it was favorable for further crosslinking reaction,and would improve the wa ter resistance of starch adhesive;and the water resistance and adhesive strength of oxidized starch could be enhanced obviously with TDI.The longest water resistance time of crosslinking oxidized starch was 24d which was prepared with the optimal formula showed as follows: the starch concentration was 10%,the potassium permanganate amount was 0.0290g,the volume of glutaraldehyde and TDI was 2mL and 1mL respectively.