Preparation and performance testing of grafted potato starch hot melt adhesive

HAN Juan; HOU Gaoming; LU Sen; LIN Limiao; ZHU Feng

Abstract：To address the compatibility issues of starch-based hot melt adhesives,potato starch was selected as the main research subject.Ammonium persulfate was used as the initiator,and sorbic acid,stearic acid,lauric acid,and alginate were chosen respectively as graft monomers.Through esterification reactions,the potato starch was grafted and modified to produce modified potato starch.Subsequently,components such as ethylene-vinyl acetate copolymer(EVA)and rosin resin were added,and the mixture was melt-blended at specific temperatures to ultimately produce a biodegradable starch-based hot melt adhesive.Compared to the original potato starch,the modified starch showed better dispersibility in the adhesive,with uniform distribution,and without significant presence of granules.Performance tests indicated that the compatibility of the modified potato starch hot melt adhesive was improved compared to the original potato starch hot melt adhesive,with key performance indicators such as melt viscosity,softening point,hardness,elongation at break,and tensile strength meeting the national standards for hot melt adhesives used in food packaging.The experimental results demonstrate that the challenge of low compatibility of potato starch in hot melt adhesive preparation can be overcome,which enables the development of a modified potato starch hot melt adhesive that meets conventional market demands.