Pressure-sensitive adhesive for post-it paper, and preparation method of pressure-sensitive adhesive

Abstract

The invention relates to pressure-sensitive adhesive for post-it paper. The pressure-sensitive adhesive is prepared from the following components in parts by weight: 70-90 parts of a styrene-butadiene-styrene block copolymer (SBS), 50-100 parts of a styrene-isoprene-styrene block copolymer (SIS), 15-25 parts of polyisobutene (PIB), 20-40 parts of tackifying resin, 25-45 parts of ethylene glycol monobutyraldehyde ether stearate, 8-15 parts of a softening agent, 5-8 parts of an anti-aging agent, 0.5-3 parts of a light stabilizer and 5-8 parts of liquid paraffin, wherein the content of a styrene block in the SBS is 10-30%, and the molecular weight of the PIB polymer is 10000-30000. The pressure-sensitive adhesive provided by the invention is prepared by using the SBS and the SIS as main polymer components; by compounding the components and introducing the PIB and the tackifying resin, the adhesive can be balanced in the aspects of initial adhesivity, persistent adhesivity and the bonding strength, the initial adhesivity and re-adhesiveness of the post-it paper can be improved, and the problem that the post-it paper is not stable and easily falls off, so that the use of the post-it paper is influenced can be solved.

Description

technical field [0001] The invention relates to the technical field of pressure-sensitive adhesives, in particular to a pressure-sensitive adhesive for sticky notes and a preparation method thereof. Background technique [0002] Post-it stickers are generally coated with a layer of adhesive on the side of a small piece of paper for temporary sticking. Paste, so its bonding strength is generally not large, and the adhesive will not penetrate into the surface to be pasted, but at the same time it must have a certain initial tack. And because the coating amount is small, about several grams per square meter, high coating amount will increase the cost on the one hand, and on the other hand, the thickness of the side with coated glue will increase a lot compared with the uncoated part. It affects its packaging and use, so it is necessary to ensure a certain degree of adhesion under such a low coating amount, so that it will not be loose when packaged, and it can be easily torn o...

AI Technical Summary

Problems solved by technology

And because the coating amount is small, about several grams per square meter, high coating amount will increase the cost on the one hand, and on the other hand, the thickness of the side with coated glue will increase a lot compared with the uncoated part. It affects its packaging and use, so it is necessary to ensure a certain degree of adhesion under such a low coating amount, so that it will not be loose when packaged, and it can be easily torn off when used.

However, the current sticky notes can usually be easily torn off from the next sticky note, and can also be easily torn off from the pasted surface without destroying the paper, but it is still unsatisfactory in terms of the firmness of sticking , easy to fall off, or fall off by itself after a period of time, or the adhesion is not strong and easy to fall off when it is pasted again after being torn off, or the requirements for the surface to be pasted are higher, and the adhesion is not easy on a slightly rough surface fall off

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