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They can be classified into chrome complex, silane series, titanium ester series and aluminic acid compounds.:
(1)Chrome complex coupling agent
It as developed in the early 1950s.
(2)Silane coupling agent
General formula: RSiX3.
(3)Titanium ester coupling agent
It has four types:
①single alkoxyl type.
②single alkoxyl pyrophosphate type.
③chelated type
④ligand type.
(4)Aluminic acid compounds coupling agent
It is low molecular formula inorganic polymer containing zirconium aluminate.