Modification And Application Of Starch Adhesive

Traditional petroleum based adhesives have problems such as non renewable,high pollution,and formaldehyde release,which hinder their development process.After years of research and improvement,the applicability of new environmentally friendly adhesives has gradually expanded.The starch adhesive studied in this paper,also known as environmentally friendly materials,has been applied in industry,but there are still problems such as weak adhesion and high steam demand for cardboard box drying.In view of the above problems such as weak adhesion in the industry at present,this paper uses tapioca as the main raw material,and uses cross-linking,oxidation,etherification grafting and other processes to modify it.The actual differences between the samples are explored by measuring its initial viscosity with an initial viscosity detector,and testing the peel strength with a peel strength tester.Further derivative experiments were conducted to investigate the feasibility of starch pressure-sensitive adhesives using experimental instruments such as DSC and TG,and to preliminarily investigate their properties.Firstly,in industrial optimization experiments,based on existing industrial ratios,gelatinization and single factor analysis experiments are conducted to find the best solution.Then,various modification additives were added to the starch adhesive for modification experiments,and additives such as GTA(2,3 epoxypropyltrimethylammonium chloride),isopropanol(initiator),epichlorohydrin,polyacrylamide,etc.were added through etherification,cross-linking,and other modification methods.By testing practicality,clarify the product performance under the final process flow.Then,based on this process,the feasibility of starch based pressure sensitive adhesive was further studied.For the gelatinized starch adhesive,plasticizers and blending materials were added,and different materials were compared to investigate their effects on the initial viscosity,peel strength,and other related properties.The research results show that the effect is better when the starch addition ratio is about30%.As the starch ratio further increases,the viscosity of the starch adhesive can be improved.When the ratio exceeds 35%,although the viscosity is high,the actual coating effect of corrugated paper is not good,and properties such as adhesion strength will decrease.The etherification reaction effectively reduces the gelatinization temperature,and the grafting reaction between oxidized starch and polyacrylamide significantly improves the adhesion strength.The amount of crosslinking agent added shall not exceed 1%,the crosslinking temperature shall be 25 ℃,the time shall be 15 minutes,the etherification temperature shall be25 ℃,the etherification time shall be 15 minutes,and the oxidation time shall not exceed 0.5hours.For the effectiveness of series additives,the improvement effect varies in different aspects,and the optimal ratio is found by controlling different influencing factors.In terms of pressure sensitive adhesive,suitable conditions were obtained by controlling factors such as temperature and component ratio,such as starch ratio of about 33%,alkaline water concentration still adopting the factory’s original ratio,glycerol addition ratio 1:1 with starch,and the optimal addition content of citric acid not exceeding 3% of starch content.Its glass transition temperature,initial viscosity,peel strength and other performance strength are good.The derivative research of starch pressure-sensitive adhesive is more applicable in terms of resources compared to traditional types,with advantages such as safety,non-toxicity,and renewability,and has research value.