Factors affecting the adhesion of polyurethane coated wheels

Factors affecting the adhesion of polyurethane coated wheels What are the factors that affect the adhesion of polyurethane wheels?
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 low molecular weight will affect the bonding effect. Only by selecting the appropriate molecular weight, the rubber adhesion of the polyurethane wheel will reach the standard.
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, blooming phenomenon, release agent, etc. formed under the oxidation of the rubber surface will reduce its own adhesive force. Therefore, before bonding, the surface of the bonded object should be treated by an appropriate method, such as solvent wiping, mechanical roughening, etc
. 5. The speed of solvent volatilization: When we use solvent-based adhesives for bonding, the residual solvent is prone to produce pores, which affects the bonding strength. Too fast or too slow is not conducive to smooth bonding. Therefore, when choosing a mixed solvent with a combination of speed and slow, the effect will be better. You can also use a low-concentration solvent to paint on the iron wheel multiple times, and the effect is also good.
In addition to the above five factors that will affect the bonding quality of polyurethane wheel rubber, its bonding time, temperature and external pressure will also affect its bonding strength to a certain extent.
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