Modified styrene acrylic emulsion water-based adhesive and preparation method thereof

Abstract

The invention relates to the field of adhesives and particularly relates to a preparation method of a modified styrene acrylic emulsion water-based adhesive. The preparation method comprises the following steps: (1) pre-emulsification: mixing hard monomers, soft monomers, functional monomers and an emulsifying agent in deionized water, and heating to 45-55 DEG C, so as to form a stable pre-emulsion; (2) pre-polymerization reaction: adding 20wt%-30wt% of the pre-emulsion into a reactor, introducing nitrogen, heating to 70-75 DEG C, and dropwise adding an initiator for reacting for 10-30 minutes; and (3) polymerization reaction: dropwise adding the residue pre-emulsion, a proper amount of the initiator and a proper amount of a chain transfer agent into the reactor at a constant temperature for 30-60 minutes, after the dropwise adding is finished, carrying out constant-temperature reaction for 1-2 hours, heating to 80-85 DEG C, and adding a proper amount of the initiator once so as to remove residual monomers. The invention aims at providing the stable-performance modified styrene acrylic emulsion water-based adhesive capable of resisting the changes of high and low temperatures and the preparation method of the modified styrene acrylic emulsion water-based adhesive.

Description

technical field [0001] The invention relates to the field of chemical engineering, in particular to a modified propylbenzene emulsion water-based glue and a preparation method thereof. Background technique [0002] Propylbenzene emulsion (styrene-acrylate emulsion) is obtained by emulsion copolymerization of styrene and acrylate monomers. It has good water resistance, alkali resistance, scrub resistance, and outdoor aging resistance, and is widely used in adhesives, coatings and other fields. [0003] Chinese patent application CN201410116461.5 discloses a silicone-modified styrene-acrylic emulsion, which relates to the field of chemical technology. 1) First, deionized water, tert-butanol and isopropanol are put into the reactor and stirred and mixed evenly, heated to 60- 70°C, prepare solution a; 2) Dissolve styrene, isooctyl acrylate, ethyl silicate, organosilicon monomer and anionic ring-opening polymerization emulsion into solution a, stir well until the temperature rea...

AI Technical Summary

Problems solved by technology

[0007] However, the low-temperature antifreeze and high-temperature stability of the above-mentioned water-based glue cannot meet the needs of transportation and storage in different regions, especially in the case of drastic temperature changes, it is easy to cause the glue to separate out and delaminate, resulting in poor stability.