Classification and characteristics according to chemical composition:
1. polyolefin hot-melt adhesive: (1): Polyethylene hot melt adhesive with good adhesion, low price, easy adhesion of porous surface; self shaping cloth (2) hot melt adhesive polypropylene: the curing speed, heat resistance is not high, often with low molecular polyethylene or polypropylene crystallization mix to improve curing speed and temperature resistance. 2. ethylene copolymer and hot melt adhesive: (1) comonomer: acrylic, vinyl acetate, acrylic acid (ester), maleic anhydride, vinyl chloride can be more than two yuan;
(2) ethylene vinyl acetate copolymer (EVA) hot melt adhesive: excellent adhesion, flexibility, heat flow and cold tolerance; chemical resistance, thermal stability, weatherability and excellent electrical properties; low intensity, heat intolerance, fatty oil. Dispensing stereotypes cloth 3. polyester hot-melt adhesive: excellent electrical insulation; good adhesion strength; impact resistance, water resistance, heat resistance, cold resistance, medium resistance and flexibility are better; bonding materials; high melt viscosity. 4. polyamide hot-melt adhesive: excellent heat resistance, cold resistance, electrical properties, oil resistance, chemical resistance and medium resistance colorless, tasteless;; fast curing; bonding a plurality of metal and nonmetal; good compatibility with other resins.
(1) high molecular weight polyamide hot melt adhesive: good fluidity, high bonding strength, dry cleaning and washing;
(2) low molecular weight polyamide hot melt adhesive: good strength and toughness, most of the performance is better than that of EVA hot melt adhesive. 5. polyurethane hot-melt adhesive: (1) thermoplastic polyurethane hot melt adhesive strength than polyester polyolefin hot melt adhesive, good elasticity, excellent mechanical performance, simple operation, suitable for high speed automatic bonding the production line, no pollution, commonly used in bonding fabric, metal and glass; low temperature hot melt adhesive Po in Hong Kong (2): a set of reactive polyurethane hot melt adhesive hot melt adhesive, glue and reactive polyurethane adhesive in one of the advantages, no pollution and high efficiency. 6. styrene block copolymer and hot-melt adhesive. With high temperature fluidity and plasticity; show flexibility and elasticity at ambient temperature.
(1) SBS: good solubility, good compatibility with resin, and the tackifier can reduce the melt viscosity, very suitable for the preparation of hot melt adhesive, hot melt pressure sensitive adhesive; ordinary hot-melt film (2): SIS with plastic, soluble thermoplastic vulcanized rubber and the toughness, elasticity, modulus, low solution viscosity and melt viscosity, good processability, good adhesion and cohesion, excellent performance, making HMPSA main material. 7. other types of hot melt adhesive.
8. new hot melt adhesive: (1) reactive hot melt adhesive, heat resistance, heat resistance, cold resistance, creep resistance and chemical bonding and better performance of metal, wood, glass, leather, plastics, exposed time, to meet the needs of some assembly work, using a wider range of hot melt adhesive Po in Hong Kong; (2) hot melt pressure sensitive adhesive without solvent, no pollution, convenient use; drawback is the heat resistance, lack of cohesion, the development of new thermoplastic elastomer;
(3) the solvent type hot melt adhesive: many enterprise products require the use of hot melt adhesive, but not using existing granular or powdered products, only in the liquid state coating, solvent to be dried, the left on the substrate of thin and hot melt adhesive film even in hot pressing adhesive for shoes lining implementation; qualitative (4) water soluble and water dispersible adhesive: EVA hot melt adhesive defects: mainly used in bookbinding, paper packaging materials are hard to dissolve cellulose, etc. in the old paper recycling, attached to the spots on recycled paper, and affect the appearance of printing, and the bonding part cut processing regeneration before consuming;
(5) re wetting hot-melt adhesive: a hot melt adhesive that is coated on one surface by hot melt technology and wetted with water on the other side, so that two surfaces can be bonded to each other.
(6) other new hot-melt adhesives: water sensitive hot-melt adhesives, heat resistant hot-melt adhesives, hot-melt sealing adhesives, flame retardant hot-melt adhesives, foaming hot-melt adhesives, biodegradable hot-melt adhesives.