Rubber dumbbell sheets are made of rubber as the main material, processed with the cooperation of vulcanizing agents, reinforcement agents, softeners, anti-aging agents and other rubber additives, natural rubber, butadiene rubber, nitrile rubber can be used to produce rubber dumbbell sheets. The main components of ultra-fine tire recycled rubber are natural rubber, synthetic rubber and carbon black, which are compatible with natural rubber, butadiene rubber, etc., and can replace some raw materials to produce rubber dumbbell sheets, effectively reducing raw material costs.
1. Performance requirements of rubber dumbbell plates
Rubber dumbbell sheets are required to have good impact resistance and toughness to prevent rupture or damage when subjected to large impact forces (generally require the tensile strength of rubber materials to be greater than 8MPa and the elongation at break to be greater than 300%); It has good wear resistance, and will not quickly cause scratches, slag and other problems when rubbing with the ground and other dumbbell plates. Rubber dumbbell sheets need to have a certain hardness (60-80 degrees), which will not be easily deformed during use, too high, dumbbell plates may break when dropped or impacted, and too low hardness is easy to deform during use, affecting the grip and use feeling.
Rubber dumbbell sheets also need to have good temperature resistance, water resistance and chemical resistance, better adapt to indoor and outdoor temperature differences, long-term exposure to air and sunlight is not easy to age, contact with sweat, etc. are not easy to swell or corrode.
2. Techniques for mixing ultra-fine tire recycled rubber in rubber dumbbell sheets
Ultra-fine tire recycled rubber is generally made of 80-grit tire rubber powder as raw material, after desulfurization, filtration, refining and other processes, with good elasticity, high fineness, no impurities, no taste, etc., the price is much lower than that of natural rubber E5LYY37, used in the production of rubber dumbbell sheets can effectively reduce the cost of raw materials. The particle size of ultra-fine tire recycled rubber is small and uniformly distributed, easy to mix evenly with other rubbers and compounding agents, and the power consumption is low during mixing, which can improve the mixing efficiency and the quality of the compound rubber, and ensure the quality uniformity of rubber dumbbell sheets.
When rubber dumbbell sheets are mixed with ultra-fine tire recycled rubber to reduce costs, the mixing ratio of recycled rubber is generally determined according to the specific needs of dumbbell sheets and the physical properties of recycled glue, and the general mixing ratio is among 20%-50%, and some dumbbell tablets can completely use ultra-fine tire recycled glue.
3. Commonly used compound for the production of rubber dumbbell sheets with ultra-fine tire recycled rubber
(1) Vulcanization system
When using ultra-fine tire recycled rubber and natural rubber to produce rubber dumbbell sheets, the sulfur-accelerator system is mostly used, and the accelerators CZ and DM are used with sulfur (1%-3%) to accelerate the vulcanization reaction, and zinc oxide and stearic acid are used as activators to further improve the sulfur efficiency.
(2) Reinforce the filling system
When using carbon black reinforcement agents for rubber dumbbell tablets containing recycled rubber, high wear resistance carbon black such as N330 can effectively improve the wear resistance of dumbbell plates. The combination of semi-reinforced carbon black can improve the processing process performance of the compound, and the addition of carbon black generally accounts for 30%-50% of the total amount of rubber. If you want to further reduce the production cost of rubber dumbbell sheets, you can fill calcium carbonate and terracotta with an appropriate amount of calcium carbonate and terracotta, and the amount of filler is too much and it is easy to become brittle.
(3) Soften the system
Reduce the hardness of rubber materials and improve the processing fluidity of natural rubber and recycled rubber, rubber dumbbell tablets often use paraffin oil and engine oil as softeners, and the addition amount is 5%-10%, and too much dosage can easily lead to stickiness of rubber materials.
(4) Anti-aging system
Compared with natural rubber, ultra-fine tire recycled rubber has been pre-subjected to intense treatment such as vulcanization, compounding and oxidation, rubber hydrocarbons have become a stable state that can no longer be changed, so the aging resistance is better than that of natural rubber, especially when exposed to sunlight, the weather resistance is good. When using natural rubber/ultra-fine tire recycled rubber to produce rubber dumbbell sheets, anti-aging agents 4010NA and RD can be used to delay aging, especially when the amount of natural rubber is large.
When using ultra-fine tire recycled rubber in rubber dumbbell sheets to reduce costs, it is necessary to choose the appropriate ultra-fine tire recycled rubber according to the specific needs of dumbbell plates. Hongyun ultra-fine tire recycled rubber grade A raw material is 80 mesh 900 waste tire whole tire rubber powder, after magnetic separation, desulfurization, filtration, refining and molding, than the rubber products produced by ordinary tire recycled rubber are more black and bright, when using no need to plasticize and open the process is simple, in the production process of adding chemical raw materials to mix and park after 12 to 24 hours of rubber products produced rubber products can achieve the best effect, after thousands of rubber product enterprises can significantly reduce the cost of rubber raw materials and labor and electricity costs.
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