Preparation method for acrylate pressure sensitive adhesive providing good adhesion for low energy surface

Abstract

The present invention discloses a preparation method for an acrylate pressure sensitive adhesive providing good adhesion for a low energy surface. The preparation method comprises the following steps: (1) adding an organic base to a pressure sensitive adhesive composition, completely and uniformly stirring, and standing for 10 min to prepare a pressure sensitive adhesive mixture; (2) adding a tackifying resin solution to the prepared pressure sensitive adhesive mixture from the step (1), completely and uniformly stirring, and standing for 10 min; 3) adding an appropriate amount of a curing agent diluent to the prepared pressure sensitive adhesive mixture from the step (2), uniformly stirring, and standing for 20 min; and (4) uniformly coating the prepared pressure sensitive adhesive from the step (3) on a substrate, and carrying out drying curing for 0.5-1 h in a constant temperature oven with a temperature of 60-80 DEG C. The acrylate pressure sensitive adhesive prepared by the method of the present invention can be completely cured within 0.5-1 h, and no post-curing effect is generated, wherein a 180 DEG peel strength is more than or equal to 20 N / 20 mm, a room temperature hold tack is more than or equal to 35 h, and the acrylate pressure sensitive adhesive of the present invention still has fluidity and can be used for the pressure sensitive adhesive product coating step after storing for 8-12 days under conditions of a room temperature, sealing and darkness.

Description

technical field

[0001] The invention relates to a method for preparing an acrylic pressure-sensitive adhesive, which belongs to the technical field of adhesive preparation. Background technique

[0002] Pressure sensitive adhesive is the abbreviation of pressure sensitive adhesive, which is a kind of adhesive that is sensitive to pressure. At present, the curing agents used for cross-linking and curing of solvent-based pressure-sensitive adhesives are mainly polyisocyanates, which can cross-link and cure the adhesive at room temperature, but generally suffer from slow curing speed, poor storage performance and high cost. The problem is that it needs to be added before coating. As the crosslinking reaction proceeds, the viscosity of the pressure-sensitive adhesive solution will rise rapidly, and the glue will be cloudy because the polyisocyanate will absorb the moisture in the solvent and the moisture in the air, thus Make the curing agent invalid, so it is necessary to stri...

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