Preparation of acrylic ester copolymer emulsion for pressure-sensitive adhesive

Abstract

The invention relates to a method for preparing an acrylate polymer emulsion used for a pressure sensitive adhesive, which belongs to an adhesive based on acrylate polymer. The method for preparing the acrylate polymer emulsion used for the pressure sensitive adhesive comprises the following steps: (1) preparation of a seed emulsion; (2) pre-emulsification of shell layer monomers; and (3) gradient feeding of a shell layer. The method adopts the seed emulsion polymerization technology to drip a hard monomer, namely methyl methacrylate (MMA) into the shell layer, so that the concentration is subjected to discontinuous change and the organic-inorganic acrylate polymer emulsion provided with an obvious core-shell structure is prepared, wherein nano silicon dioxide is taken as a core and a copolymer of acrylic ester and acrylic monomers is taken as the shell layer; and the hard monomer of the shell layer is subjected to concentration gradient change. The acrylate polymer emulsion can be used as the pressure sensitive adhesive after drying and film forming; the prepared pressure sensitive adhesive has the advantages of high continuous viscous force and reduction of the residual gum content under the condition of gum peeling; and the initial adhesion and the peeling strength can be improved when the continuous viscous force is larger.

Description

A kind of preparation method of acrylate copolymer emulsion for pressure-sensitive adhesive technical field The technical solution of the present invention relates to an adhesive based on an acrylate copolymer, in particular to a method for preparing an acrylate copolymer emulsion for a pressure-sensitive adhesive. Background technique Pressure-sensitive adhesives can be prepared by processes such as emulsion polymerization, solution polymerization, heating and melting, and UV curing. However, in recent years, with people's emphasis on environmental protection, safety, energy saving, etc. and the continuous expansion of the application of pressure-sensitive adhesives, pressure-sensitive adhesives have been promoted to develop in the direction of low pollution, energy saving, high performance and multi-functionality, especially in developed countries. After putting forward pollution-free, pollution-free, resource-saving and energy-saving as the prerequisites for developing ...

AI Technical Summary

Problems solved by technology

Common emulsion acrylate pressure-sensitive adhesives on the market are mostly polymer-polymer type, and this type of adhesive has the following disadvantages: when the initial adhesion and peeling performance of the pressure-sensitive adhesive are good, the holding performance will be poor; When it is good, the initial adhesion performance and peeling performance will become poor, and the balance [M.D.Gower, R.A.Shanks.The effect of varied monomer composition on adhesive performance and peeling master cures for acrylic pressure-sensitive adhesives.Journal of Applied Polymer Science, 2004, Vol.93, 2909-2917]

However, due to the uniform addition of methyl methacrylate (MMA) in the process of introducing hard monomers through the shell layer, the emulsion-type acrylate pressure-sensitive adhesive produced by the latex particles is easy to leave residue on the adherend after peeling off. When the glue and initial adhesive force are large, the holding force will decrease, etc.

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