Crosslinking agents are divided into external crosslinking agents and internal crosslinking agents
1. Diplomatic joint agent
The so-called crosslinking agent is added before use, and then crosslinking reaction occurs at room temperature, heating or irradiation. The external crosslinking agent is divided into the following categories:
Polyisocyanate (JQ-1, JQ-1E, JQ-2E, JQ-3E, JQ-4, JQ-5, JQ-6, PAPI, emulsifiable MDI, tetraisocyanate).
Polyamines (propylene diamine, MOCA).
Polyols (polyethylene glycol, polypropylene glycol, trimethylolpropane).
Glycidyl ether (polypropylene glycol glycidyl ether).
Inorganic substances (zinc oxide, aluminum chloride, aluminum sulfate, sulfur, boric acid, borax, chromium nitrate).
Organic substances (styrene, a-methylstyrene, acrylonitrile, acrylic acid, methacrylic acid, glyoxal, aziridine).
Organosilicons (ethyl orthosilicate, methyl orthosilicate, trimethoxysilane).
Benzene sulfonic acid (p-toluenesulfonic acid, p-toluenesulfonyl chloride).
Acrylic esters (1,4-butanediol diacrylate, ethylene glycol dimethacrylate, TAC, butyl acrylate, HEA, HPA, HEMA, HPMA, MMA).
Organic peroxides (dicumyl peroxide, bis-2,4-dichlorobenzoyl peroxide).
Metal organic compounds (aluminum isopropoxide, zinc acetate, titanium acetylacetonate).
Multifunctional polycarbodiimide crosslinking agent.
Blocked crosslinking agent
Isocyanate crosslinking agent
2. Internal crosslinking agent
The so-called internal crosslinking agent means that as a monomer, it enters into the macromolecular structure chain during polymerization, or is added to the adhesive as a component, and can be stored stably. It can only be crosslinked when heated to a certain temperature or radiation conditions. Joint reaction. Commonly used internal crosslinking agents are vinyl monomers, such as acrylic acid, hydroxyethyl acrylate, hydroxypropyl acrylate, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, divinylbenzene, N- Methyl acrylamide, diacetone acrylamide.