The abrasion resistance of reclaimed rubber is the ability of reclaimed rubber vulcanizate to resist material loss due to surface damage under the action of friction, which is closely related to the service life of rubber products, including wear, rolling wear and fatigue wear. When using recycled rubber to produce rubber conveyor belts, seals, rubber soles and other products, the rubber compound is required to have good wear resistance. To improve the wear resistance of recycled rubber products, rubber product manufacturers can start from the variety of admixture.
1. effect of vulcanization system admixture on wear resistance of recycled rubber products
The type of vulcanized cross-linking bond affects the wear resistance of reclaimed rubber products. Generally, the more the content of single sulfur bond, the better the wear resistance of vulcanizates. The results showed that the wear resistance of the reclaimed rubber vulcanizate cured with sulfur+accelerator CZ system was better, and the wear resistance and mechanical properties of the vulcanizate cured with DTDM+sulfur (less than 1 phr)+accelerator nobs system were better.
When vulcanizing natural rubber with sulfur+CZ (main accelerator)+TMTD/DM/D (Auxiliary Accelerator), the sulfur content was 1.8-2.5 parts by mass; The sulfur content of rubber compound based on cis-1,4-polybutadiene rubber is 1.5-1.8 parts by mass. If you want to improve the wear resistance of recycled rubber products when using a large number of latex reclaimed rubber, tire reclaimed rubber or cis-1,4-polybutadiene reclaimed rubber to produce rubber products, you can refer to the above sulfur dosage and accelerator dosage.
2. effect of reinforcement and filling system admixture on wear resistance of recycled rubber products
Carbon black is the most commonly used reinforcing agent in the production of reclaimed rubber products. The wear resistance of reclaimed rubber vulcanizates increases with the decrease of carbon black particle size and the increase of surface activity and dispersion; The abrasion resistance of reclaimed rubber vulcanizates filled with new process carbon black e5lyy430 was 5% higher than that of ordinary carbon black; Silica treated by silane coupling can also improve the wear resistance of reclaimed rubber vulcanizates. In actual production, the abrasion resistance of vulcanizates with 50 phr saf and ISAF carbon black in EPDM compound is twice as high as that filled with the same amount of FEF carbon black.
3. effect of softening system admixture on wear resistance of reclaimed rubber vulcanizates
In the production of reclaimed rubber products, the addition of softener will reduce the wear resistance of reclaimed rubber vulcanizates. When using natural latex reclaimed rubber or tire reclaimed rubber to produce rubber products, aromatic oil has little loss of wear resistance.
4. effect of anti-aging system admixture on wear resistance of reclaimed rubber vulcanizates
The reasonable use of antioxidant in the formulation of reclaimed rubber products can improve the wear resistance of reclaimed rubber vulcanizates to a certain extent. It is recommended to select antioxidant varieties that can prevent fatigue aging, such as antioxidant 4010NA, antioxidant D, etc. When using reclaimed rubber to produce rubber products with high requirements for wear resistance, rubber product manufacturers must choose appropriate varieties of reclaimed rubber and rubber compounding agent to reduce more raw material costs and production energy consumption on the premise of ensuring the wear resistance of finished products.
Hongyun high strength tire reclaimed rubber B is made of 1200 waste tires whose top is brushed and crushed by a rubber washer, and then the impurities are removed by magnetic separation and vibrating screen. It is produced by high strength segmented desulfurization process. It has the characteristics of high strength, good elasticity, small specific gravity, no migration, low Mooney viscosity and easy operation. It is the best raw material to partially replace natural rubber to produce black high strength rubber products or black high wear-resistant rubber products.
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