High-viscosity emulsion type pressure sensitive adhesive and preparation method thereof

Abstract

The invention provides a high-viscosity emulsion type pressure sensitive adhesive. The high-viscosity emulsion type pressure sensitive adhesive is prepared by polymerizing the following components inparts by weight: 38 to 40 parts of water, 0.3 to 0.4 part of ammonium persulfate, 0.3 to 0.4 part of emulsifier, 50 to 55 parts of acrylate monomer mixed materials and double-bond-polymerizable tackifying resin, wherein the double-bond-polymerizable tackifying resin is prepared from 1 to 6 parts of polymerized rosin resin and 1 to 6 parts of terpene-phenolic resin. Meanwhile, the invention provides a preparation method of the high-viscosity emulsion type pressure sensitive adhesive. The preparation method comprises the following steps: adding 14 parts of the water and 0.4 part of the emulsifier into an emulsification tank, opening a stirrer for stirring, and adding quantitative acrylate monomer mixed materials required by a formula for sufficient emulsifying to form pre-emulsion; adding the water, heating to 80 to 90 DEG C and then adding NaHCO3 and the ammonium persulfate; controlling the temperature of a reaction still at 80 to 90 DEG C, and dropwise adding the pre-emulsion and the ammonium persulfate to obtain emulsion; keeping the temperature of the reaction still at 80 to 90 DEG C, and dropwise adding polymerized rosin resin emulsion and terpene-phenolic resin emulsion; cooling after the dropwise adding is ended, carrying out heat preservation at 45 to 50 DEG C, adding ammonia water and adjusting a pH value to 8.

Description

technical field [0001] The invention belongs to the field of pressure-sensitive adhesives, in particular to a high-viscosity emulsion-type pressure-sensitive adhesive and a preparation method thereof. Background technique [0002] At present, the adhesives used in high-viscosity pressure-sensitive adhesive label paper are mainly solvent-based and emulsion-based. Although solvent-based pressure-sensitive adhesives have high bonding performance, they have defects in environmental protection and safety, so they are gradually being used by emulsions. Type pressure sensitive adhesive replaced. However, the viscosity of pure acrylic emulsion pressure-sensitive adhesives cannot meet the high viscosity requirements. The viscosity of the adhesive and the applicability of the adhesive are often improved by adding a rosin-type tackifying resin to the colloid. Although this addition method can improve the emulsion type The viscosity of pressure-sensitive adhesives has disadvantages: ...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the defects in the prior art, the present invention proposes a high-viscosity emulsion-type pressure-sensitive adhesive and its preparation method, which s...