| abstract |
The invention relates to the technical field of starch, in particular to a starch modification method. According to the modification method, starch is subjected to graft modification and an acrylate-terminated polyurethane prepolymer capable of reacting with the starch is prepared, so that a modified starch mixed solution and the polyurethane prepolymer can undergo a free radical polymerization reaction under the action of a second initiator, a cross-linked network structure is formed between the starch and polyurethane molecules, the condition that two phases are incompatible to cause insufficient mechanical properties or insufficient water resistance is avoided, and the cross-linking property of the network structure can be further improved by adding a cross-linking agent, so that the mechanical property and the water resistance of a coating film are better improved. |