(1) Polyisocyanate adhesive (monomer adhesive) polyisocyanate adhesive is seldom used in the form of monomer because of its high toxicity and poor toughness. In general, the modified polyisocyanate adhesive is prepared by mixing it with rubber, or the vinyl polyurethane adhesive is prepared by mixing it with polyvinyl alcohol solution. The adhesive can also be used as a cross-linking agent in other base materials. Commonly used polyisocyanate adhesives are polyphenyl polyisocyanate, diphenyl dimethyl diisocyanate, etc.
(2) Isocyanate based polyurethane adhesive isocyanate based polyurethane adhesive is mainly a polyurethane prepolymer containing - NCO, which is produced by the reaction of polyisocyanate and polyhydroxy compound (polyester or polyether). The prepolymer has high polarity and activity, and can react with substances containing active hydrogen, so it also has high adhesion. This kind of adhesive can be divided into single component, two-component, solvent-free and other types.
(3) Hydroxyl containing polyurethane adhesive hydroxyl containing polyurethane adhesive is a kind of linear polyurethane polymer containing hydroxyl, which is formed by the reaction of diisocyanate with polyester or polyether with difunctionality. The adhesive can be used as thermoplastic adhesive or thermosetting adhesive. When it is used as thermoplastic adhesive, the adhesive layer is soft, flexible, impact resistant and has good initial adhesion, but the adhesive strength is poor, the solvent resistance is poor and it is easy to creep; As a thermosetting adhesive, it is mainly cured by hydroxyl chemical reaction at both ends of the molecule. The adhesive improves the above shortcomings, but the softness and impact resistance are affected. The adhesive belongs to two-component adhesive, which is prepared on site before use.
(4) polyurethane resin adhesive polyurethane resin adhesive is mainly composed of polyisocyanates and polyhydroxyl compounds, which are produced by different kinds of adhesives such as solution, emulsion, pressure sensitive adhesive and powder. The isocyanate group in polyurethane adhesive containing isocyanate group is blocked, and the blocked polyurethane adhesive prepared also belongs to this type
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