Viscosity-reduced pressure-sensitive adhesive and preparation method thereof

Abstract

The invention belongs to the technical field of adhesives, and particularly discloses a viscosity-reduced pressure-sensitive adhesive and a preparation method thereof. The viscosity-reduced pressure-sensitive adhesive is prepared from, by weight, 90-100 parts of isononyl acrylate, 60-75 parts of hydrogenated rosin ester, 50-80 parts of resin and 0.6-0.7 part of sodium bicarbonate. According to thepreparation method, process adjustment is adopted to control molecular weight and molecular weight distribution, adjustment is realized through adjusting of the use amount of a curing agent; releaseforce adjustment range is wide, the maximum peel strength is high; the resin, the curing agent, a solvent, a self-expanding microsphere foaming agent, a toner and a foaming agent are mixed to preparea heating-viscosity-reduced adhesive layer; the combination of the self-expanding microsphere foaming agent, the toner and the foaming agent is beneficial to controlling the closed-cell foaming of thick-layer PVC, central coking caused by heat accumulation is avoided, so that the viscosity of the surface of a base material can be reduced after heating, the pressure-sensitive adhesive can be conveniently removed after heating, UV irradiation and heating dual-mode viscosity reduction of the pressure-sensitive adhesive can be realized, and meanwhile, the stripping strength can be adjusted as required.

Description

technical field [0001] The invention belongs to the technical field of adhesive processing, and in particular relates to a viscosity-reducing pressure-sensitive adhesive and a preparation method thereof. Background technique [0002] Pressure-sensitive adhesive, the abbreviation of pressure-sensitive adhesive, is a kind of adhesive that is sensitive to pressure. It is mainly used to prepare pressure-sensitive adhesive tape. The peeling force shown) < the cohesive force of the adhesive (the force between the molecules of the pressure-sensitive adhesive) < the adhesion force of the adhesive (the adhesion between the adhesive and the substrate), such a pressure-sensitive adhesive will not be used during use. There will be degumming and other phenomena. According to the main resin composition, pressure-sensitive adhesives can be divided into rubber type and resin type. Rubber type can be divided into natural rubber and synthetic rubber. Resin type mainly includes acrylic a...

AI Technical Summary

Problems solved by technology

[0003] China Patent Network discloses a preparation method of UV viscosity-reducing pressure-sensitive adhesive with adjustable peeling force. Wide range and high maximum peeling force, which can conveniently and quickly meet the market demand of different peeling forces. The viscosity reduction method is relatively simple, which cannot meet the viscosity reduction needs of pressure-sensitive adhesives in different usage methods. The application range has certain limitations. China Patent Network It also discloses a heat-viscosity-reducing protective film processed by heat-viscosity-reducing adhesive. In this patent, a self-expanding microsphere foaming agent and OBSH foaming agent are added to the material of the heat-viscosity-reducing adhesive layer. The OBSH foaming agent has a small heat release. , which is beneficial to control the closed-cell foaming of thick PVC, so as not to accumulate heat and cause coking in the center, so that the viscosity of the substrate surface can be reduced after heating, and the protective film can be removed after heating. However, this patent only uses heating to compress Sensitive adhesives are used to reduce viscosity, and the method of reducing viscosity is relatively simple