3results about How to "Improve initial tack performance" patented technology

This invention discloses a food-grade alkali-free modified starch adhesive for corrugated paper lamination and its preparation method, belonging to the field of adhesive technology. The modified starch adhesive comprises, by weight, 150-250 parts starch, 250-350 parts water, 4-10 parts hydrogen peroxide, 1-5 parts defoamer, 5-10 parts preservative, and 150-200 parts modified ethylene-vinyl acetate copolymer emulsion; wherein the modified ethylene-vinyl acetate copolymer emulsion is prepared by blending cellulose aqueous solution, PVA, filler, and ethylene-vinyl acetate emulsion in a specific ratio. This invention does not use caustic soda or borax throughout the process; all raw materials are food-grade, and the finished product is weakly alkaline, meeting the requirements of GB4806.15-2024. Through synergistic oxidation modification and emulsion compounding, it significantly improves initial tack, bonding strength, and drying speed, resulting in a low scrap rate, good resistance to damp heat and freeze-thaw cycles, and is suitable for high-speed, room-temperature lamination production of food-grade and ordinary corrugated paper.

This invention discloses a PVA water-soluble adhesive tape and its preparation method, relating to the field of environmentally friendly polymer materials technology, and belonging to patent classification number C09J103 / 04. The method includes the following steps: mixing oxidized starch with deionized water, adding polyamide polyamine epichlorohydrin resin, and heating to carry out an ionic crosslinking reaction to obtain ionicly crosslinked starch; cooling the ionicly crosslinked starch, then adding carboxybetaine methacrylate and ammonium persulfate, and heating to carry out a free radical grafting reaction to obtain modified starch; adding polyvinyl alcohol aqueous solution and borax decahydrate to the modified starch to carry out a borate ester crosslinking reaction to obtain a water-soluble starch-based adhesive; preparing a PVA film substrate using a blown film process, uniformly coating the water-soluble starch-based adhesive onto the PVA film substrate using a precision coating machine, and then curling and slitting to obtain the PVA water-soluble adhesive tape. The PVA water-soluble adhesive tape prepared by this invention not only has good water solubility but also excellent adhesive properties.

This invention discloses a low-temperature activated adhesive and its preparation method, belonging to the field of adhesive technology. The adhesive, by weight, mainly comprises 8-10 parts of polycarbonate polyol with a number-average molecular weight of 3000, 1-3 parts of polycarbonate polyol with a number-average molecular weight of 2000, and 5-7 parts of bio-based PTMEG with a carbon content of 60-70%, combined with a chain extender, a compound isocyanate, a catalyst, a terminator, n-butyl polymethacrylate, and an environmentally friendly solvent. This invention, through the synergistic regulation of the polyol compound system, specific bio-based PTMEG modification, and tackifying components, enables the adhesive to achieve an activation temperature as low as 38℃, and complete activation below 50℃. It also exhibits excellent initial tack, peel strength, and heat aging resistance, perfectly meeting the bonding requirements of heat-sensitive footwear materials. The preparation process is mild and controllable, environmentally friendly, and easy for industrial-scale production.