Pressure sensitive adhesive use

Polypropylene sealing, textured paper (crepe paper), and PVc electrical tape are seen on the market.

Pressure-sensitive adhesives are mainly solvent-based or latex-based adhesives of acrylic and rubber. Due to the need of high-speed operation, reasonable coating, and elimination of solvent pollution problems, the development of the hot melt pressure sensitive adhesive, the hot melt adhesive and the pressure sensitive adhesive are integrated, solvent-free, non-polluting, and convenient to use. It is applied in a molten state, and a slight finger pressure is applied after cooling and solidification to effect adhesion.

It is used in a wide range of applications such as diapers, women's products, double-sided tape, labels, packaging, medical care, bookbinding, surface protection films, wood processing, wallpaper and shoemaking. Among them, the consumption of HMPSA for packaging is the largest, accounting for almost half of the total. The main component of the hot melt pressure sensitive adhesive is styrene thermoplastic elastomer. The hot melt pressure sensitive adhesive has the advantages of no solvent, no air pollution, and high productivity. However, the disadvantage is that heat resistance and cohesion are insufficient. New thermoplastic elastomers such as SEBS, SEPS, and epoxidized SBS are used to prepare higher performance hot melt pressure sensitive adhesives.

New acrylate block copolymer heat resistance, oxidation stability, UV stability, good adhesion to HDPE, stainless steel, glass, polystyrene, acrylic, polycarbonate, nylon, polypropylene, etc., can be used Medical tape, transparent film, label, etc. The acrylic polymer is combined with a water-soluble polymer to form a water-dispersible hot-melt pressure-sensitive adhesive. The acrylic polymer is dispersed in a weak alkaline aqueous solution to a non-adhesive particle of 100 μ or less, and is easily separated, and is suitable for recycling old paper. The benzophenone-containing acrylate monomer is copolymerized to give a low Tg acrylic copolymer.

The heating and melting pressure sensitive adhesive is easy to crosslink by UV irradiation. The advantage is that no photoinitiator needs to be added, and there is no problem of initiator residue.

It can be coated at low temperature (120~140°C) with low melting point, low VOC, low odor, no skin irritation and good thermal stability. The composition of the pressure sensitive adhesive is a special type of adhesive, that is, the glue is applied to the substrate and processed into a strip and supplied as a reel, including a solvent activated adhesive tape, a heated adhesive tape and a pressure sensitive adhesive. Adhesive tape. For example, medically used adhesive plasters and electrical insulating adhesives are pressure-sensitive adhesive tapes. Composition of pressure-sensitive adhesive tapes 1 Pressure-sensitive adhesive 2 Substrate 3 Under-treatment agent 4 Back treatment agent 5 The main components of the pressure-sensitive adhesive are: Rubber type and resin type.

For example, polyacrylate or polyvinyl ether, the substrate is required to be uniform, the stretchability is small, and the solvent is infiltrated, including:

(1) Fabrics such as cotton, glass cloth or non-woven fabric.

(2) Plastic films such as PE, PP, PVC and polyester films.

(3) Paper such as kraft paper, glass transparent paper, etc.

The substrate has a degree of originality between 0.1 and 0.5. The effect of the underlying treatment agent is to increase the adhesion strength between the adhesive and the substrate, so that the adhesive tape is removed without causing the adhesive to be detached from the substrate and staining the surface to be adhered. And make the adhesive tape reusable. The commonly used underlayer treatment agent is a neoprene which is partially vulcanized with isocyanate, a modified chlorinated rubber. The back treatment agent is generally prepared from materials such as polyacrylate, PVC, cellulose derivative or organosilicon compound. To the role of the release agent. If a double-sided adhesive tape is required to add a layer of release paper such as semi-rigid PVC film, PP film or kraft paper. Adhesive properties of pressure-sensitive adhesive. Pressure-sensitive adhesive does not need to be warmed, and can be bonded by finger pressure. It is an anti-stripping strength adhesive whose adhesion characteristics are four elements: the cohesive strength of the T (fast tack) adhesive layer; the K-adhesive force is the adhesion between the adhesive and the substrate.

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