Water-based adhesive for dry-type composite of plastic films and preparation method thereof

Abstract

The invention relates to the technical field of water-based adhesives, in particular to a water-based adhesive for dry-type composite of plastic films and a preparation method thereof, and the water-based adhesive is prepared from the following components in parts by weight: 60-80 parts of deionized water, 0.5-1.0 part of a buffering agent, 0.8-1.2 parts of a persulfate oxidizing agent, 0.5-1.0 part of an anionic polymerizable emulsifier, 85-100 parts of a conventional acrylate monomer mixture, 7-13 parts of a heteroalicyclic acrylate monomer, 0.65-1.3 parts of a high-molecular type reducing agent, 0.5-1.0 part of a fine particle size emulsifier, 1.2-1.5 parts of a wetting agent and 0.5-0.8 part of a defoaming agent through a specific process. The water-based adhesive is more similar to asolvent-type polyurethane adhesive in the performance, is strong in plastic film adhesive force, good in temperature resistance and water resistance, and high in coating and drying speed, the coating4-cup viscosity is 12-18 seconds, and the solid content reaches 55-60%.

Description

technical field [0001] The invention relates to the technical field of water-based adhesives, in particular to a water-based adhesive for dry compounding of plastic films and a preparation method thereof. Background technique [0002] Plastic film dry compounding is the most commonly used process for preparing flexible packaging plastic bags in the fields of food, medicine, daily necessities, and electronic products. It is to coat a layer of adhesive on the surface of the printed plastic film and dry the adhesive through a drying tunnel. After that, it is bonded with another plastic film, and after hot pressing, it is wound up to obtain a plastic dry composite film, and then it is prepared into a flexible packaging plastic bag through slitting and bag making processes. At present, the market-leading product of adhesives for dry lamination of plastic films in my country is solvent-based polyurethane adhesives, which need to be compounded with about 70% ethyl acetate or toluen...

AI Technical Summary

Problems solved by technology

If it is necessary to further expand its application field, the acrylate emulsion adhesives currently on the market for dry lamination of plastic films need to be further improved to overcome some of the following problems: (1) Most of them are synthesized by thermally induced polymerization, and their reaction temperature is relatively high , generally 80-90°C, the reaction heat generated during the polymerization process cannot be discharged in time, and the reaction will automatically accelerate, so that the obtained polymer chains are easily disintegrated to form polymer branched chains, and the bonding strength to the plastic film is not high; ( 2) For the lack of application of new functional monomers that can effectively improve the bonding strength of plastics, most of them still use conventional hard monomers, soft monomers and functional monomers to design and synthesize formulas; (3) In order to adapt to 150-200 online glue Roller high-speed (150 m / min) sizing, the viscosity is mostly controlled at 12-18 seconds for 4 cups of coating, and the corresponding solid content is basically below 45%. Therefore, dry compounding requires high moisture content and slow drying speed. High energy consumption and low production efficiency

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