Starch-base adhesive and preparation method thereof
An adhesive and starch-based technology, which is applied in the field of starch-based adhesive preparation, can solve the problems of environmental pollution, toxicity and pollution, etc., and achieve the effect of simple preparation method, low cost and improved strength
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Embodiment 1
[0019] Polyethylene glycol and isocyanate (TDI) were prepared by a one-step method at a molar ratio of NCO:OH=1.5:1 to obtain a waterborne polyurethane prepolymer. After the prepolymer was dispersed in the water system, it was mixed with gelatinized starch in different proportions. The chemical cross-linking reaction is carried out at 50°C, and finally adhesives with different concentrations are obtained.
Embodiment 2
[0021] Polypropylene glycol and isocyanate (HDI) are prepared by a one-step method according to the molar ratio of NCO: OH = 1: 1 to obtain a waterborne polyurethane prepolymer. The chemical cross-linking reaction is carried out at ℃, and finally adhesives with different concentrations are obtained.
Embodiment 3
[0023] Polyester diol and isocyanate (TDI) are prepared by one-step method according to the molar ratio of NCO:OH=1.7:1 to obtain waterborne polyurethane prepolymer. The chemical cross-linking reaction is carried out at 60°C, and finally adhesives with different concentrations are obtained.
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