Solvent in the adhesive role is very large, some as the medium of polymerization reaction, so that the reaction is eased, the temperature is easy to control; some are used to purify monomers and auxiliaries; some used for the release of adhesive to achieve a certain degree of viscosity, is conducive to infiltration, easy to coating construction; some are used to regulate the volatile speed of adhesives; some are used to prevent the gel to increase storage stability, some used for bonding before the surface cleaning treatment agent; some are used to directly adhere to certain thermoplastic products Some can be used to reduce costs and improve efficiency.