Hot melt pressure sensitive adhesive and preparation method thereof

Abstract

The invention provides a hot melt pressure sensitive adhesive and a preparation method thereof, which solve the problems of improving initial tack, oil penetration and die cutting property, etc. The hot melt pressure sensitive adhesive comprises the following components by weight: 25-40 parts of matrix resin, 48-60 parts of tackifier, 12-22 parts of plasticizer and 0.6-1.2 part of a stabilizing agent, wherein the matrix resin comprises triblock copolymer of styrene-isoprene-styrene and diblock copolymer solution-polymerized styrene butadiene rubber of styrene-butadiene in a weight ratio of 1.2-3.1. The hot melt pressure sensitive adhesive provided by the invention has better initial tack, high peel strength and standard holding power; the hot melt pressure sensitive adhesive is free of oil penetration for seven days under heat temperature testing conditions and can be stored for one year at the normal temperature without oil penetration; the adhesive has better die cutting property; and the softening point reaches to 115 DEG C. The hot melt pressure sensitive adhesive of the invention can totally meet the requirement on fabricating back adhesive bags, labels and adhesive tapes.

Description

technical field [0001] The invention relates to a novel pressure-sensitive adhesive, in particular to a hot-melt pressure-sensitive adhesive suitable for labels, adhesive bags and adhesive tapes, and belongs to the technical field of adhesives. Background technique [0002] At present, the use of traditional emulsion-type and solvent-type pressure-sensitive adhesives in the production process has certain pollution to the environment. With the enhancement of people's awareness of environmental protection, they are gradually being abandoned by people. Hot-melt pressure-sensitive adhesives are favored and are increasingly widely used in people's daily life, such as labels, packaging, medical and health care, logistics back plastic bags and other fields. However, general-purpose hot-melt pressure-sensitive adhesives cannot meet some fields with special requirements in terms of performance. The hot-melt pressure-sensitive adhesives used in the production of labels, adhesive bags...

AI Technical Summary

Problems solved by technology

[0003] Generally, commercially available hot-melt pressure-sensitive adhesives have the following defects: 1. The plasticizer in the glue is separated from the glue, contaminating the label and causing the label to fall off; 2. The glue on the surface of the tape will gradually transfer to the side of the tape, 3. The bonding strength is low, which cannot meet the requirements of peeling off and destroying the adhesive surface; 4. The die-cutting property is not good, so that the cutter glue causes continuous cutting and cutting. If it is uneven, it needs to stop and wipe the knife, reducing production efficiency

Then put it on a coating machine preheated at 80-120°C, and stick a release paper after coating to obtain a polystyrene-polyisoprene-polystyrene ternary block copolymer hot-melt pressure-sensitive adhesive. However, the hot-melt pressure-sensitive adhesive obtained by this method still has problems such as low peel strength, short sticking time, and low softening point.

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