The molecule of PVC flocking glue contains the characteristic urethane polar bond (one NHC00 one), and also contains many ester bonds, ether bonds, urea bonds and so on. It has good bonding properties to a variety of materials. He Yicai described the synthesis of a one-component solvent-based polyurethane adhesive for PVC decorative film-metal plate. It uses high crystallinity polyester, isocyanate, chain extender, etc. as raw materials, and uses vinyl acetate resin to increase viscosity. The peel strength of the obtained product is 30-60N/2cm, the viscosity is 120-140s, and the irritation is small. The various mechanical properties of the adhesive have reached the level of imported similar adhesives, and the baking activation conditions have been greatly reduced, and the cost will be greatly reduced. It is used in many domestic PVC color board manufacturers and has been well received, and it can completely replace imported similar adhesives. Du Guanben introduced an adhesive mainly composed of water-based polymer emulsion and isocyanate, which is especially suitable for the composite of PVC film and wooden substrate. When the ratio of emulsion to curing agent is l00:7f mass ratio), the sizing amount is about 1009/m2, the hot pressing temperature is 85～90℃, the hot pressing cycle is 3min, and the pressure is 0. At 35MPa, the normal peel strength of the PVC film after 72h is 29N/mm. This adhesive also has a high initial strength, and can meet the processing requirements of “wood carving, milling and carving-PVC coating”. In addition, the adhesive is an aqueous polymer emulsion. No organic solvent pollution, safe to use, and widely applicable. Xu Dasheng and others used homemade special polyester diol, 4,4`-diphenylmethane diisocyanate and chain extender 1,4-butanediol as the main raw materials to synthesize a kind for the production of PU-PVC composite leather. Of one-component adhesives. Compared with the commonly used two-component polyurethane adhesive for composite leather. The adhesive has high bonding strength. The application performance comparison of these two adhesives is shown in Table 1. Wei Minxi chose MPU-20 polyurethane adhesive for the composite of PVC/steel plate and bakelite board. The peel strength of l800 of MPU-20 glue ≥ l. 96kN/m, the pH value is between 6-8, and the operating temperature is 0.40°C. This glue has the characteristics of fast construction, simple process, saving man-hours, low cost, strong adhesion, curing at room temperature, and insoluble and non-melting, non-toxic and flame retardant after the glue layer is cured. The composite material is used for the decoration of ship cabin walls, and the effect is better.