A kind of polyurethane water-based transfer glue and preparation method thereof

Abstract

The invention discloses polyurethane water-based transfer adhesive. The polyurethane water-based transfer adhesive is prepared from raw materials including, by weight, 40-70% of water, 6-25% of polyether polyol or polyester polyol with the functionality of 2, 0.5-1.5% of polyether polyol or polyester polyol with the functionality higher than or equal to 3, 6-15% of isocyanate, 1-2% of hydrophilicchain extenders, 0.8-1.2% of dimethylethanolamine, 0.5-3.0% of post-chain extenders, 0.01-0.3% of post-cross-linking agents, 0.5-1.5% of terminal hydroxyl acrylate, 8-15% of methyl methacrylate, 5-10%of butyl methacrylate, 1-5% of butyl acrylate, 0.1-0.2% of emulsifiers, 0.1-0.4% of catalysts, 0.01-0.05% of thickeners, 0.1-0.3% of defoaming agents and 0.1-0.3% of preservatives. The invention further provides a method for preparing the polyurethane water-based transfer adhesive. The polyurethane water-based transfer adhesive and the method have the advantages of high adhesion between aluminumplated layers and paper, excellent folding resistance, explosion resistance, stain-on-firing resistance and gold stamping processing property, good antifreeze performance and ultralow VOC (volatile organic compound) content.

Description

technical field [0001] The invention relates to an adhesive, in particular to a polyurethane water-based transfer adhesive and a preparation method thereof. Background technique [0002] Transfer aluminized paper is a new type of packaging material, with its environmental protection, aesthetics, economy and anti-counterfeiting characteristics, it replaces the traditional PET-coated cardboard or aluminum foil composite cardboard, and is widely used in high-end printing such as tobacco, alcohol, food, and medicine. packaging field. The production process of transfer aluminized paper is to first coat the transfer coating on the film (such as PP film or PET film), dry the film and vacuum aluminize it, then apply the transfer glue, compound the transfer aluminized film and paper, and dry Finally, the film is peeled off to become a transfer aluminized paper. [0003] The early transfer adhesives were mainly organic solvent-based. Due to the pollution of the environment and the r...

AI Technical Summary

Problems solved by technology

The invention patent with the patent number CN201510088121.0 discloses a water-based transfer adhesive and its preparation method. The technical solution is to solve the contradiction between the folding resistance, heat resistance and embossing resistance of the acrylic transfer adhesive. A core-shell structure acrylate transfer adhesive with different glass transition temperatures. This water-based transfer adhesive has strong adhesion, excellent compression resistance, and improved folding resistance. However, due to the inherent properties of acrylic emulsions, the emulsion produced by this scheme The performance cannot meet the requirements of ultra-low VOC, high folding resistance and heat resistance