The invention discloses thermochemical
modified starch, a preparation method and a method for preparing an
adhesive by using the thermochemical
modified starch and relates to
modified starch and adhesives prepared by using the
starch. The method is used for solving the technical problems of the existing
starch adhesives that the
water resistance is not ideal, the
transportation cost is high, and the
starch modification process is complicated. The thermochemical modified starch is prepared through uniformly spraying an acid solution into the starch, carrying out uniform mixing, then, carrying out heating treatment, carrying out baking, carrying out cooling, and then, carrying out crushing. The method for preparing the
adhesive comprises the following steps: adding
polyvinyl alcohol into a reactor pot with stirring, heating and cooling devices, adding water, adopting a staged-heating method to dissolve the
polyvinyl alcohol with stirring, and then, cooling to
room temperature; adding the thermochemical modified starch, carrying out stirring at
room temperature, and then, adding polymethylene polyphenyl polyisocyanate, thereby obtaining the
adhesive. According to the method, by using the technological characteristic that the starch-based adhesive is prepared by only adding the water to the thermochemical modified starch before use, the problem that the traditional solution type starch main agents are low in transportation efficiency and are prone to layering and mildewing is solved.