Room temperature self-crosslinking polyacrylate pressure-sensitive adhesive and preparation method and application thereof

Abstract

The invention belongs to the field of room temperature self-crosslinking materials, and discloses a room temperature self-crosslinking polyacrylate pressure-sensitive adhesive and a preparation method and application thereof. The method comprises the steps of preparing a pre-emulsion from 85-95 parts of acrylate soft monomer, 5-15 parts of hard monomer, 2-5 parts of functional monomer, 1.3-4 parts of emulgator and 30-55 parts of deionized water by mass fraction; then heating up the pre-emulsion, the deionized water, an initiator, the emulgator and a PH buffer agent for reaction; dripping a chain transfer agent, the pre-emulsion and an initiator solution when the emulsion shows blue light; adding ketone-containing carbonyl monomer, heating up together and reacting; then cooling down and regulating pH value to be 6.5-7.0; and adding hydrazide monomer, stirring and mixing uniformly, so as to obtain the room temperature self-crosslinking polyacrylate pressure-sensitive adhesive. The room temperature self-crosslinking polyacrylate pressure-sensitive adhesive prepared by the method has excellent indexes like excellent initial adhesive force, excellent persistent viscosity force and excellent peel strength, and can be used for preparing labels with good bond performance.

Description

technical field [0001] The invention belongs to the field of room temperature self-crosslinking materials, in particular to a room temperature self-crosslinking polyacrylate pressure-sensitive adhesive and its preparation method and application. Background technique [0002] Pressure-sensitive adhesive is a kind of viscoelastic body with both liquid viscous properties and solid elastic properties. This viscoelastic body also has "affecting factors and properties that can withstand both the contact process and the damage process of bonding". Generally speaking, it is easy to stick, not difficult to peel off, and there is no phenomenon of polluting the surface of the adherend after peeling off. Because the adhesive layer does not dry for a long time, it is also called "adhesive". [0003] Polyacrylate pressure-sensitive adhesives used for labels are currently used in many domestic solvent-based adhesives that are flammable, toxic, and pollute the environment. Solvent-based ad...

AI Technical Summary

Problems solved by technology

[0003] The polyacrylate pressure-sensitive adhesives used for labels are currently in the use of flammable, toxic, and environmentally polluting solvent-based adhesives.

Solvent-based adhesives not only cause waste of resources, adversely affect the health of construction workers, but also seriously pollute the environment

[0004] Emulsion-type polyacrylate pressure-sensitive adhesives generally have slow coating speed and slow drying speed, and the three mechanical properties of initial adhesion, peel strength and holding strength cannot be well balanced.

According to HG-T2406-2002, the basic requirements for label adhesives are initial adhesion ≥ 10 (ball number), peel strength ≥ 4N / 25mm, but this requirement is far from meeting the normal application market of label adhesives, so the development performance Better pressure-sensitive adhesives are particularly important