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What factors affect the adhesion of rubber in polyurethane rollers?

What factors affect the adhesion of rubber in polyurethane rollers?
In the processing and production process of polyurethane roller products, the effect of the adhesion of rubber to the iron wheel on the quality of the product cannot be ignored. If you can't pay attention to these factors that affect adhesion in time, then the later use effect will definitely be greatly discounted. Regarding the factors that affect its adhesion:
  1. Molecular chain structure: 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 adhesive strength.
  2. Molecular weight: Too high or too low molecular weight will affect the bonding effect. Only by choosing the appropriate molecular weight, the adhesion will be the best.
  3, the components of the rubber compound: the use of an appropriate amount of aftereffect accelerator or tackifier can promote the deep diffusion of molecules, thereby increasing the viscosity of the rubber compound, such as resin, rosin, pine tar, etc. Excessive or insufficient dosage will affect the adhesion strength.
  4. Surface condition of the adhesive: the oxide film formed under the oxidation of the rubber surface, blooming phenomenon, release agent, etc. will reduce its own adhesion. Therefore, before bonding, proper methods must be used to treat the surface of the bonded object, such as solvent wiping and mechanical roughening.
  5. The speed of solvent volatilization: When we use solvent-based adhesives for bonding, the residual solvent is likely to cause pores, which affects the strength of the bonding. Too fast or too slow is not conducive to smooth bonding. Therefore, a mixed solvent with a combination of speed and slowness has the best effect when selecting, and you can also use a low-concentration solvent to brush on the iron wheel several times, and the effect is also good.
   In addition, the time, temperature and external pressure for making polyurethane rollers also affect the bonding strength to a certain extent. The quality of the bonding determines the quality of the product.
Therefore, its bonding occupies a very important position. Therefore, in the process of bonding, if we encounter the above-mentioned factors that may affect the bonding, we must Avoid it in time and don't ignore it.