Pressure Sensitive Adhesive Types

Pressure Sensitive Adhesive Types Introduction

1. Elastic type pressure sensitive adhesive

The elastomer used by this kind of pressure sensitive adhesive is very early natural rubber and gradually expanded to a variety of synthetic rubber and thermoplastic elastomer. According to the elastomer used, this kind of pressure sensitive adhesive can be further divided into natural rubber pressure sensitive adhesive, synthetic rubber pressure sensitive adhesive, and thermoplastic elastomer pressure sensitive adhesive.

Natural rubber pressure sensitive adhesive

This is a kind of rubber pressure sensitive adhesive developed quite early and the output is still very large. They are natural rubber elastomer as the main body, with viscosifying resin, softener, antioxidant, makeup filler and crosslinking (curing) agent and other additives complex mixture, because natural rubber has high cohesion strength and elasticity, and can be well miscible with much viscosifying resin, get high viscosity and good wetness to the adhesive material, So natural rubber is a kind of ideal pressure sensitive adhesive body material.

Its main disadvantages are the existence of unsaturated double bonds in the molecule, poor light resistance, and oxygen aging performance. However, its weather ability and heat resistance can be improved by cross-linking and using antioxidants. Almost all kinds of pressure sensitive adhesive products can be made with natural rubber pressure sensitive adhesive.

Synthetic rubber and reclaimed rubber pressure sensitive adhesive

Styrene butadiene rubber, polyisoprene rubber, polyisobutene, and butyl rubber, and synthetic rubber such as neoprene rubber, and nitrile rubber as the main body, with adhesive resin, softener, antioxidant, and other additives made of pressure sensitive adhesives have their own characteristics. But none of them are as important as natural rubber pressure-sensitive adhesives. Recycled rubber, especially the pressure sensitive adhesive made of recycled natural rubber, also has good performance and a relatively low price, so it is also paid attention to.

Thermoplastic elastomer pressure sensitive adhesive

Thermoplastic elastomers represented by styrene-butadiene-styrene block copolymer (SBS) and styrene-isopentane-styrene block copolymer (SIS) are the main raw materials for manufacturing hot melt pressure-sensitive adhesives. The hot-melt pressure-sensitive adhesive does not use solvents, does not produce environmental pollution, high production efficiency, in today’s society for energy saving and environmental pollution increasingly increasing voice, the importance of this kind of pressure sensitive adhesive is also increasing.

2. Resin type pressure sensitive adhesive

This kind of pressure sensitive adhesive used resin polyacrylate, polyurethane, polyvinyl chloride, polyethylene ether, and so on. Among them, polyacrylate is used quite a lot at present, and its output has exceeded that of natural rubber pressure sensitive adhesive.

Acrylic pressure sensitive adhesive

Acrylate copolymers obtained from the copolymerization of various acrylate monomers are very important resin-type pressure-sensitive adhesives. Compared with the rubber type pressure sensitive adhesive, they have many advantages: colorless and transparent appearance and good weather resistance; Generally do not need to use adhesive resin, softener and antioxidant additives can get good pressure sensitive bonding properties, so the formula is simple; By using copolymerization and crosslinking pressure sensitive adhesives can be prepared to meet different performance requirements.

Therefore, in the past 20 years, this kind of pressure sensitive adhesive has developed very rapidly and has replaced the dominant position of natural rubber pressure sensitive adhesive.

Silicone and other resin pressure sensitive adhesive is composed of silicone resin and silicone rubber mixed pressure sensitive adhesive, has excellent high-temperature resistance and aging resistance, and is a kind of more important special pressure sensitive adhesive, its main use is to manufacture a variety of pressure sensitive adhesive products.

Polyvinyl ether is a kind of resin pressure sensitive adhesive developed earlier, but its importance has been gradually replaced by acrylate pressure sensitive adhesive.

In addition, ethylene. Vinyl acetate copolymer (EVA), polyurethane, polyester, PVC, and other resins can also be prepared into a variety of pressure sensitive adhesives.

Morphological classification of press sensitive adhesives

Pressure sensitive adhesive can be divided into solvent pressure sensitive adhesive, aqueous pressure sensitive adhesive, emulsion pressure sensitive adhesive, hot melt pressure sensitive adhesive, and calendering pressure sensitive adhesive five types.

At present, emulsion type, solvent type, and hot melt type pressure-sensitive adhesives occupy the main position.

Press sensitive adhesive body polymer whether crosslinked

Pressure sensitive adhesives can be divided into crosslinked and non-crosslinked pressure sensitive adhesives. Crosslinked pressure sensitive adhesive can be divided into heating crosslinking type, room temperature crosslinking type, optical crosslinking type, etc. Crosslinked pressure sensitive adhesive has good bonding strength, especially suitable for making pressure sensitive labels.