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Action Mechanism of Tackifying Resin

By DALIAN RICHON CHEM   |    Posted: 3/7 , 2024

In the rubber products and tire industry, tackifying resins provide the necessary viscosity during the processing process, so rubber products and tire companies are more concerned about the performance of rubber products themselves. However, the study of its viscosification mechanism should also be paid enough attention.

The theoretical research of Dalian Richon Chem on tackifying resins focuses on industries that use a large number of it, such as pressure sensitive adhesives, hot melt adhesives, etc., in these fields, the amount of it can be as high as 50 to 70 parts. Since hot melt adhesives and pressure sensitive adhesives are also composed of rubber and tackifying resins, the tackifying mechanism in these areas can also be applied to the rubber industry. The explanation mechanism can be divided into two aspects: on the one hand, the molecular adsorption and diffusion theory of rubber contact surface, and on the other hand, the formation theory of contact interface. The molecular adsorption and diffusion theory of rubber contact surface includes contact, adsorption, diffusion and other explanations, and finally unified as two-way adsorption and diffusion.

When two materials come into contact, the atoms and molecules in the material will interact with each other. These forces include strong forces such as chemical bonds, as well as weak forces such as hydrogen bonds and dispersion forces. In the case of materials, their viscosity is affected by dispersion, polarity and hydrogen bonding. In the case of rubber materials, polymers can be diffused and entangled upon contact, and through the diffusion of polymer molecules, the two surfaces are finally joined together. This is a good explanation for why small pieces of rubber become whole after a certain amount of time, because over time, the diffusion of the polymer continues and eventually forms a whole. The diffusion and entanglement of polymers are closely related to their relative molecular mass. If the relative molecular mass is small, the diffusion is easy, but the entanglement is low. If the molecular weight is high, the diffusion is difficult, but the entanglement occurs and the strength after entanglement is better. For areas that use less viscosifying resins, when considering the choice of viscosifying resins, it is also necessary to consider the effect of the relative molecular mass of the rubber used on the viscosity.

Dalian Richon is a professional rubber accelerators & antioxidants manufacturer and supplier in China. We can offer tackifying resin with high quality and moderate price. If you have any demand of rubber additives,please feel freely contact us.