Preparation method of single-component solvent-type high-stripping acrylic acid pressure-sensitive adhesive

Abstract

The invention discloses a preparation method of a single-component solvent-type high-stripping acrylic acid pressure-sensitive adhesive, wherein the preparation method comprises: 1) preparing raw materials of the high-stripping acrylic acid pressure-sensitive adhesive, comprising, by weight: (A) an internal-polymerization monomer (hard monomer): 10 parts of methyl methacrylate, 12 parts of styrene and 10 parts of vinyl acetate, (B) a viscous monomer (soft monomer): 45 parts of butyl acrylate and 40 parts of 2-ethylhexyl acrylate, (C) a modified monomer: 6 parts of methyl acrylic acid and 2 parts of hydroxyethyl acrylate, (D) a solvent: 40 parts of ethyl acetate and 15 parts of ethanol, (E) a curing (crosslinking) agent: 0.5 parts of triacetylacetone; (F) a residual monomer eliminating agent and a crosslinking agent: 0.2 parts of triethanolamine; (G) 1 part of an initiator (of which the use amount accounts for 0.8% of the total mass of the monomers); and (H) 0.02 parts of a chain transfer agent. The preparation method can be used for preparing the acrylic acid pressure-sensitive adhesive being good in original adhesion, high in stripping strength, good in adhesion permanence and excellent in coating processing performance, thereby greatly developing the available range of the acrylic acid pressure-sensitive adhesive.

Description

technical field [0001] The invention belongs to the technical field of adhesive materials, in particular to a preparation method of a single-component solvent-type high-peeling acrylic pressure-sensitive adhesive. Background technique [0002] Pressure-sensitive adhesive is a kind of adhesive that is sensitive to pressure. It can form a bond on the surface of the adhered object with only light pressure of fingers. Its mechanical properties can be balanced by initial adhesion, holding force and peeling force. [0003] Solvent-based acrylate pressure-sensitive adhesives are composed of viscous liquids obtained by radical polymerization of acrylate monomers in organic solvents, with or without other additives. Solvent-based acrylate pressure-sensitive adhesives have many advantages such as low average molecular weight, good wettability, high initial adhesion, fast drying speed, and good water resistance. [0004] Acrylic pressure-sensitive adhesive is the most widely used pres...

AI Technical Summary

Problems solved by technology

[0007] 2. When preparing cross-linked acrylate pressure-sensitive adhesives, the stability of the glue is not very good, and the storage time of the glue is very short, which is not conducive to continuous production. Generally, it is a two-component cross-linked acrylate pressure-sensitive adhesive. This brings great inconvenience to the use, and the temperature required for cross-linking is generally high, but the cross-linking speed is very slow;

[0008] 3. The acrylic pressure-sensitive adhesives in the prior art all have the weakness of low peel strength. Generally, if the initial adhesion and holding strength are taken into account, the peel strength is only 11-12N / 25mm, which can only meet low requirements. It is used in occasions with high requirements; that is, it is required to be firmly pasted, and the peeling force must be increased to 18N / 25mm, and the acrylic pressure-sensitive adhesives of the prior art cannot meet the use requirements;

[0009] 4. Due to the high viscosity in the late stage of solution polymerization, the monomer conversion rate is not high. The product not only has the odor of monomers, but also affects the holding force of the pressure-sensitive adhesive, and there are adverse phenomena such as longitudinal displacement of the hanging paste and adhesive residue. , which also greatly limits its application range