What factors affect the adhesion of rubber in polyurethane rollers?

In the processing and production process of polyurethane roller products, the adhesion of rubber to iron wheels has a significant impact on the quality of the products. Therefore, before processing, we must make preparations and fully consider the factors that affect adhesion. Because if we cannot pay attention to these factors that affect adhesion in a timely manner, the later use effect will definitely be greatly discounted. Therefore, in order to meet the requirements of use, everyone needs to understand some of the factors that affect its adhesion. Next, we will briefly explain them.
1. The structure of molecular chains: There is a positive correlation between the polarity similarity and compatibility of bonded rubber molecules. The more similar the polarity, the better the compatibility, and the higher the bonding strength.
2. Molecular weight size: Both high and low molecular weight values can affect the bonding effect. Only by selecting an appropriate molecular weight can adhesion be optimal.
3. Composition of the adhesive: The use of an appropriate amount of post effect promoter or tackifier can promote deep diffusion of molecules, thereby increasing the viscosity of the adhesive, such as resin, rosin, pine tar, etc. Excessive or insufficient dosage can affect the bonding strength.
4. Surface state of adhesive: The oxide film, frost spraying, and isolation agent formed by the oxidation of the adhesive surface can reduce its own adhesion. Therefore, before bonding, appropriate methods must be used to treat the surface of the adhesive, such as solvent wiping, mechanical roughening, etc.
5. The rate of solvent volatilization: When we use solvent based adhesives for bonding, it is easy for residual solvents to produce pores, which can affect the bonding strength. Speed too fast or too slow is not conducive to smooth adhesion. Therefore, the mixed solvent that combines speed and speed is the best choice, and low concentration solvents can also be applied multiple times on iron wheels, resulting in good results.
In addition, the time, temperature, and external pressure required to produce polyurethane roller bonding also affect the strength of the bonding to a certain extent. The quality of adhesion determines the quality of product use, therefore, its adhesion occupies a very important position. Therefore, in the process of adhesion, if we encounter the above factors that may affect adhesion, we must avoid them in a timely manner and never ignore them.