The fire hose will bear huge pressure in the previous work. As a flexible pipe fitting, its use environment is relatively special, and it is difficult to seal the pipe wall. Flax braid as the main packaging material on the periphery of the pipe wall cannot bear all the burden of sealing. In order to achieve high-efficiency sealing requirements, high-performance glue is generally used as a lining on the inner wall of the flax braid to strengthen the seal of the fire hose.

At present, the bonding adhesives commonly used in the inner wall of fire hoses are mostly chemically synthesized adhesives, mainly including epoxy resin, acrylic resin, polyurethane, fluororesin and rubber, among which polyurethane is rich in relatively polar allophanate And urethane groups, can have high adhesion to porous materials such as ceramics, paper and fabrics, and smooth surfaces such as plastics, glass and rubber.

The full name of polyurethane is polyurethane (PU), which belongs to polymer compounds. Compared with PVC styrofoam, soft polyurethane has higher stability, mechanical properties, chemical resistance and resilience, and better shock resistance and heat insulation.

Epoxy resin is the product of polycondensation between bisphenol A and epichlorohydrin. It is a thermosetting resin with strong chemical activity. After curing and crosslinking, it will form a network structure. Strong performance.