Preparation method of high-solid-content low-viscosity pressure-sensitive adhesive

Abstract

The invention relates to a preparation method of a high-solid-content low-viscosity pressure-sensitive adhesive. The preparation method specifically includes the steps of 1), preparation of raw materials; 2), preparation of pre-emulsion; 3), preparation of the high-solid-content low-viscosity pressure-sensitive adhesive; the raw materials include, by weight, 40-70 parts of butyl acrylate, 5-15 parts of acrylate esters, 0.5-10 parts of carboxyl containing functional monomers, 0.01-0.1 part of a buffering agent, 0.7-3 parts of an emulsifying agent, 0.3-3 parts of an initiating agent, 0.5-1.5 parts of a defoaming agent WBA, 20-40 parts of deionized water, 0.1-1 part of an oxidizing agent, 0.1-1 part of a reducing agent and 0.5-10 parts of a pH controlling agent. The preparation method has the advantages that the raw materials and use amount of the same are changed, the type of the monomers is reduced, the polymers capable of promoting stability of the pressure-sensitive adhesive and reducing viscosity of the adhesive are selected, high solid content of the pressure-sensitive adhesive is guaranteed, and viscosity of the pressure-sensitive adhesive is lowered.

Description

technical field [0001] The invention belongs to the field of adhesive manufacturing, in particular to a pressure-sensitive adhesive with high solid content and low viscosity [0002] Glue preparation method. Background technique [0003] The current biaxially oriented polypropylene films are mostly coated with ordinary pressure-sensitive adhesives with low solid content. Although the price of this type of glue is low, the technology is mature and coating is relatively convenient. However, when drying to the same degree, the heat required for glue with low solid content is much higher than that required for glue with high solid content, and the transportation cost per unit of dry glue is correspondingly higher. [0004] In view of the above phenomenon, patent CN 101676347 A discloses a 60% high solid content pressure sensitive adhesive and its preparation method. The 60% high solid content pressure sensitive adhesive is as follows by weight percentage: butyl acrylate 48-54%,...

AI Technical Summary

Problems solved by technology

But there are still the following disadvantages: 1. There are many types of polymerized monomers, which have a large impact on the polymerization stability and viscosity of the pressure-sensitive adhesive, which makes the viscosity of the pressure-sensitive adhesive not low enough; 2. The emulsifiers and The amount of initiator is relatively small, and the amount of buffer is relatively large, so that the polymerization gel rate of the pressure-sensitive adhesive is reduced, and the viscosity is relatively increased, thereby reducing the initial adhesion and holding force of the pressure-sensitive adhesive.