The full name of pressure sensitive adhesives is pressure sensitive adhesives, commonly known as self-adhesives. There are more than 10 definitions of pressure-sensitive adhesives and pressure-sensitive adhesive products. The general definition is that the adhesive can immediately achieve the purpose of bonding the smooth surface of any object to be adhered by using finger pressure. At the same time, the adhesive will not contaminate the surface of the adherend if removed from the adherend. Such adhesives are called pressure sensitive adhesives. Its bonding process is very sensitive to pressure, so it is called pressure sensitive. It should be noted that pressure-sensitive adhesives are generally not directly used for the bonding of adherends, but are made by coating them on various substrates to make pressure-sensitive adhesive products (tapes and adhesive labels), and then applied to Adhesion of adherends.
Pressure-sensitive adhesive is a type of adhesive system. Due to its different bonding characteristics from various adhesives, pressure-sensitive adhesive may gradually develop into an independent system. Types of pressure sensitive adhesives include:
Solvent-based pressure sensitive adhesive;
Emulsion type pressure sensitive adhesive;
Water-soluble pressure sensitive adhesive;
Hot melt pressure sensitive adhesive;
UV-curable pressure-sensitive adhesive;
Electron beam curing pressure sensitive adhesive (100% solid content), etc.
It should be pointed out that no matter what type of pressure-sensitive adhesive is used, coumarone, C5 and C9 petroleum resins, terpene resins and various rosin resins are mostly used as tackifiers in their formulations, so pressure-sensitive adhesive products are closely related to forestry. The chemical industry is closely related and is a product area worthy of our special attention. In the 21st century, the thermoplastic elastomer pressure-sensitive adhesive (which is actually an ABA-type block copolymer thermoplastic elastomer, a new type of synthetic rubber), has gradually become popular in the pressure-sensitive adhesive formula. In order to improve, thermoplastic elastomer has become the main component of this type of pressure-sensitive adhesive. It can not only give the pressure-sensitive adhesive sufficient elasticity and cohesive strength like other rubber elastomers, but also has the ability to melt after heating and make the pressure-sensitive adhesive. It has the characteristics of hot melt coating. Since there are many types of thermoplastic elastomers (such as synthetic rubber SIS, SBS and SEPS, etc.), whether there is good compatibility between each component, and how to use it with tackifier to achieve the ideal initial viscosity, Stickiness and cohesive strength are the yardsticks that reflect the technical capabilities of each manufacturer.
Pressure-sensitive adhesive products include pressure-sensitive adhesive tape (commonly known as tape), pressure-sensitive label paper (the most common stationery we see) and pressure-sensitive adhesive sheet. All pressure-sensitive adhesive products are made of paper products, plastic films, textiles, metal foils, foams and other substrates and pressure-sensitive adhesives, as well as other auxiliary materials such as primers, release agents and release paper (release paper). etc. composition.
Pressure-sensitive adhesive products are widely used in packaging industry, automobile industry, transportation industry, electronic communication industry, electrical industry, building materials industry, machinery industry, aerospace industry, medical and health, family life and other aspects. Used for sealing, bundling, masking, sealing, protection, splicing, stamping, identification, packaging, insulation, fixing and other bonding purposes.