1. Classified by chemical composition:
①Polyolefin hot melt adhesive
Polyolefin hot-melt adhesives include polyethylene hot-melt adhesives and polypropylene hot-melt adhesives. Polyethylene hot melt adhesives are mainly used in carton, carton packaging, food packaging container sealing, non-woven fabric production, carpet, automobile carpet backing, clothing interlining bonding, etc.
② Ethylene and its copolymer hot melt adhesives
Among ethylene copolymer hot melt adhesives, ethylene-vinyl acetate copolymer hot melt adhesives are the most widely used and the most used. It is widely used in book binding, wood processing, plywood production, packaging, shoe-making automation, paper product processing, construction industry, electrical parts, vehicle parts, etc.
③ Polyester hot melt adhesive
Polyester hot melt adhesive has excellent electrical insulation and good bonding strength, impact resistance, water resistance, cold resistance, medium resistance and elasticity. It has better resistance to metals, ceramics, glass, fabrics, wood, plastics and rubber. Satisfactory adhesion, widely used in clothing, electrical appliances, shoemaking, construction and other industries.
④Polyamide hot melt adhesive
Polyamide hot melt adhesive has excellent heat resistance, cold resistance, electrical properties, oil resistance, chemical resistance and medium resistance, and has good strength and toughness. It is widely used for bonding leather, fabric, plastic, metal and other materials. It is suitable for shoemaking, automobile, civil engineering and furniture industries.
⑤Polyurethane hot melt adhesive
Polyurethane hot melt adhesives are often used to bond fabrics, metals, glass and other materials, and are used in construction, automobiles, electromechanical, packaging and other fields, and are especially suitable for automatic bonding production lines such as automobiles and buildings.
2. Classified by purpose:
① Hot melt adhesives for construction
In the construction industry, hot melt adhesives are mainly used for structure and decoration, such as cork plywood, laminated wood, plastic flooring, wallpaper and other insulation, isolation, and bonding of decorative panels and non-stressed components. The use of hot melt adhesives in construction can not only provide construction quality, increase aesthetics and comfort, but also improve the construction process. At present, the largest hot melt adhesives for construction mainly include three types: polyvinyl acetate, polyacrylic resin and polyvinyl alcohol.
② Hot melt adhesive for packaging
As the outerwear of commodities, packaging and printing have become an important factor affecting the competitiveness of commodities. People are demanding more and more for them, not only requiring low cost, durable, beautiful appearance, stimulating and attracting consumers, but also anti-counterfeiting Function. The main varieties of hot melt adhesives for packaging are EVA, polyester, polyamide, polyamide, styrene block copolymer hot melt adhesives, etc. Among them, EVA hot melt adhesives are the largest amount. In addition, hot melt adhesives are also used. Pressure sensitive adhesive.
③Hot melt adhesive for shoemaking
Hot melt adhesives have been used in the shoe industry for 40 years. The technology is mature and the range of applications is wide. The number and varieties of hot melt adhesives are constantly increasing. The basic requirements of hot melt adhesives for shoes are: high initial bonding strength and long lasting, short curing time, good flexibility, flexibility, heat resistance, oil resistance, water resistance, cold resistance, and chemical resistance. Hot-melt adhesives for shoemaking are mainly hot-melt adhesives such as ethylene-vinyl acetate copolymers, polyesters, polyamides, polyethylenes and polyurethanes, among which the first three are used in large quantities.
④Hot melt adhesive for textile
Adhesives are an important part of textile auxiliaries. The purpose of using adhesives in the textile industry is to improve appearance quality and performance. At present, hot melt adhesives commonly used in textile printing and dyeing include ethylene-vinyl acetate copolymers, polyamides, polyurethanes, etc., as well as polyester, polyethylene, polypropylene and other types of hot melt adhesives. Mainly used for clothing bonding (including: lining paste, collar, cuffs, skirt or pants waist, inner core and fabric, zippers, decorative patterns, etc.), carpet back glue, fabric flocking, non-woven fabric manufacturing .
⑤Hot melt adhesives for electronic appliances
The rapid development of the electronics industry has put forward many new issues that need to be solved urgently for the bonding technology, and put forward higher and higher requirements for the electrical insulation, temperature resistance, corrosion resistance, and humidity resistance of the adhesive. The electronic industry hot melt adhesive has the characteristics of high softening point, narrow melting range, high bonding strength, moderate viscosity, excellent electrical properties, good toughness and flame resistance. Hot melt adhesives used in the electronics industry are mainly hot melt adhesives such as polyester and polyamide.
⑥Hot melt adhesives for automobiles
As an adhesive for automobiles, its performance not only meets the requirements of automobile use and life, but also must be suitable for the manufacturability of mass flow production. It must have both suitable physical and chemical properties and good construction performance. Including storage stability and transportation safety, hot melt adhesives have certain advantages in this regard. It is mainly used for the bonding of car ceilings, and the bonding of car interior and exterior decorations. It is mainly made of polyester and polyamide hot-melt adhesives.
⑦Hot melt adhesives for medical use
The hot-melt adhesives used in medical treatment are mainly hot-melt pressure-sensitive adhesives, which are used to cover wounds, fix detectors, drug delivery carriers, and bond surgical zippers to the skin. This hot-melt adhesive must have good adhesion to various skins, the glue is easy to remove, there will be no residue, it will not harm the skin, and it will not cause skin allergies.