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3d之家 > Hose Quiz Platform > Hose Quiz Platform
product list
Hydraulic hose
Super hercules
Steel wire braided hydraulic hose
Wire wound hydraulic hose
Hydraulic oil return pipe
High-pressure resin tube
Industrial hose
UPE wear tube
Compressed air pipe
Suction and drainage hose
Steam hose
Food grade hose
Chemical hose
API series hose
Oil hose
Material conveying hose
Professional hose
Hose connector
Metric thread
American thread
Inch thread
Japanese thread
SAE flange
Yuren
Industrial joint

Rubber-to-rubber bonding

Rubber is a type of organic polymer material with high elasticity, and its modulus is relatively low. The modulus difference between different rubber materials is not very large. But there is a big difference in adhesion between different rubbers. Some rubbers have good adhesion and are easy to adhere, such as NR, CR, PU, etc .; while some rubbers have poor adhesion, and are difficult to adhere, such as EPDM, IIR, Q, etc. This is related to the molecular structure of rubber.

Rubber-to-rubber bonding is common in the production of rubber products, such as self-adhesion of mixed rubbers, mutual adhesion of different unvulcanized rubbers, and in the processing of products composed of multiple layers or parts, between layers or parts Good adhesion is required to ensure the smooth progress of the molding process. In addition, the vulcanized rubber products are repaired after being damaged in the process of use. When the composite products are prepared from vulcanized rubber, the corresponding bonding technology is used.

Adhesion between unvulcanized rubber

Unvulcanized rubber refers to rubber that has not been crosslinked, including raw rubber and compound rubber. Because there is no cross-linking, the rubber molecular chain in the unvulcanized rubber is still a linear structure, can be dissolved in a good solvent for rubber, and has high fluidity and molecular mobility. Therefore, unvulcanized rubber bonding is relatively easy to achieve. However, for unvulcanized adhesives with poor adhesion such as EPDM, IIR, and Q, it is necessary to strive for a certain bonding technology to improve their bonding effect. For NR, CR, PU and other easily-adhesive materials, good adhesion can be achieved without special treatment.

Surface properties of unvulcanized rubber

Since the unvulcanized rubber has good fluidity, is easy to deform and has surface tension, but the surface tension of rubber, especially non-polar rubber is small, and the surface free energy is not high, so the adsorption of the surface of the unvulcanized rubber is not very strong. The surface of polar rubber is polar, the surface tension is large, the cohesive energy density is large, and the adsorption is stronger than non-polar rubber. Because of the non-polar or polar unvulcanized rubber, due to the small surface tension and interfacial tension, it is easy to reach a wet state between the two surfaces, which can achieve sufficient contact, and because of good compatibility, the molecules on both surfaces It easily diffuses and penetrates between them, forming a thicker transition layer, and even the transition layer disappears. Therefore, the surface properties of the unvulcanized rubber are conducive to adhesion.