A high-solids, low-viscosity, cooking-resistant water-based film-coated adhesive and preparation method thereof

Abstract

A high-solid, low-viscosity retort-resistant water-based film coating adhesive and a preparation method thereof, comprising the steps of: (1) nano-SiO 2 Organic modification: (2) After vacuum dehydration of polypropylene glycol or polytetrahydrofuran diol, add it to reaction containing isophorone diisocyanate or hexamethylene diisocyanate and dibutyltin dilaurate; Add modified nano-SiO 2 Reaction; re-introduce hydroxyethyl methacrylate; add low-temperature deionized water dissolved in triethylamine, and disperse at a high speed to obtain a polymerizable polyurethane-acrylate emulsion containing unsaturated double bonds; (3) add mono Body: methyl methacrylate, butyl acrylate, glycidyl methacrylate, diacetone acrylamide and acrylic acid; heat preservation reaction, adjust the PH value, to get finished SiO 2 / PUA emulsion; the water-based film-coated adhesive product obtained by the present invention has the characteristics of high solid content, low viscosity, retort resistance and good mechanical properties.

Description

technical field [0001] The invention relates to the technical field of coating adhesives, in particular to a high-solid-content, low-viscosity, retort-resistant water-based coating adhesive and a preparation method thereof. Background technique [0002] At present, water-based polyurethane usually uses water as a solvent. Although it has the excellent properties of solvent-based polyurethane, such as low temperature resistance, good flexibility, and high bonding strength, as well as the advantages that solvent-based adhesives do not have, such as non-combustibility, low odor, and no pollution to the environment, but Also due to the high surface tension of water, the wettability of the non-polar film is not good; at the same time, the water-based coating adhesive synthesized from water-based polyurethane often has poor water resistance, heat resistance and mechanical properties, and high solid content. When there are problems such as high viscosity, its solid content is usual...

AI Technical Summary

Problems solved by technology

[0002] At present, water-based polyurethane usually uses water as a solvent. Although it has the excellent properties of solvent-based polyurethane, such as low temperature resistance, good flexibility, and high bonding strength, as well as the advantages that solvent-based adhesives do not have, such as non-combustibility, low odor, and no pollution to the environment, but Also due to the high surface tension of water, the wettability of the non-polar film is not good; at the same time, the water-based coating adhesive synthesized from water-based polyurethane often has poor water resistance, heat resistance and mechanical properties, and high solid content. When there are problems such as high viscosity, its solid content is usually only between 40-45%, and the viscosity is 350-550cps (RVT 3# / 5030 degrees), especially under high-temperature cooking conditions, it is easy to hydrolyze, resulting in a decrease in bonding performance, which is difficult to meet Composite flexible packaging industry requirements

Images