Butyl reclaimed rubber is made from recycled butyl inner tubes, retaining the basic properties of butyl rubber, offering excellent airtightness, good heat resistance, and chemical stability. It can be used alone or combined with butyl rubber and chlorinated butyl rubber to produce heat-resistant rubber products, such as heat-resistant rubber hoses, heat-resistant conveyor belts, heat-resistant rubber sheets, and heat-resistant sealing gaskets. When using butyl reclaimed rubber to produce heat-resistant rubber products, a reasonable formulation design can further improve the heat resistance of rubber products while reducing costs.
1. Key Points for Designing Vulcanization Systems for Butyl Reclaimed Rubber Heat-Resistant Rubber Products
When producing heat-resistant rubber products using butyl reclaimed rubber, vulcanizing rubber vulcanized with phenolic resin offers excellent heat resistance, while the rubber vulcanized with benzoquinone oxime vulcanization has better heat resistance than ordinary sulfur vulcanization systems. The main chain of butyl rubber and butyl reclaimed rubber is saturated and lacks the unsaturated double bonds required for peroxide radical crosslinking. Their molecular chains contain many tertiary carbon atoms, and using peroxides easily triggers main chain degradation and cracking rather than forming a crosslinking network.
2. Key points for the design of reinforcement filling systems for butyl reclaimed rubber heat-resistant rubber products
When producing heat-resistant rubber products mainly from butyl reclaimed rubber, inorganic fillers generally have better heat resistance than carbon black. Suitable reinforcing agents and fillers for heat-resistant rubber products include white carbon black, active zinc oxide, magnesium oxide, alumina, and silicate.
3. Key Points in the Design of Softening Systems for Butyl Reclaimed Rubber Heat-Resistant Rubber Products
In the production of butyl reclaimed rubber heat-resistant rubber products, the molecular weight of softeners is generally relatively low, making them prone to volatilization or migration and leaching at high temperatures, resulting in increased hardness and reduced elongation of vulcanized reclaimed rubber. Therefore, it is recommended to choose softeners with good thermal stability and low volatility at high temperatures in the formulation of E6LYY311-resistant butyl reclaimed rubber compounds, commonly using coumarone resin, with a typical dosage not exceeding 5 parts by mass; on the other hand, use petroleum jelly or paraffin oil, mineral rubber, or petroleum asphalt resin, using 10-20 parts by weight.
4. Key points for the anti-aging system design of heat-resistant butyl reclaimed rubber products
When producing heat-resistant rubber products using butyl reclaimed rubber or combined butyl rubber/reclaimed rubber, it is essential to choose highly efficient heat-resistant anti-aging agents to improve the heat aging resistance of the compound. Using amine anti-aging agents for butyl rubber and butyl reclaimed rubber has no significant effect, but phenolic antioxidants (such as antioxidant 2246, dialkylphenol sulfide, and 4,4'-methylene bis-6-tert-butyl-o-cresol) have significantly improved the rubber's heat resistance.
To reduce fatigue damage caused by repeated deformation of rubber at high temperatures, aging agents with better fatigue resistance can be used together with heat-resistant antioxidants, with an amount of 1.5%-2.0% of that of raw rubber. Using heat stabilizers such as stannous chloride, antimony trioxide, pentamethylene tetrasulfide (quarami) tartart, Haibolon, and a small amount of phenolic antioxidants can also improve the thermal stability of the compound.
When producing heat-resistant rubber products mainly from butyl rubber, the rational use of butyl reclaimed rubber is the main way to reduce costs and increase efficiency. Designing the formulation of heat-resistant rubber products with butyl reclaimed rubber can further improve the heat aging performance of the finished product.
55% odorless butyl reclaimed rubber is made from high-quality butyl inner tubes, employed far-infrared desulfurization methods, and 5% butyl base rubber is added during production. After international reduction rubber molecular technology treatment, it is pressed into tablet forming. It features strong airtightness, heat resistance, ozone resistance, aging resistance, shock absorption, high strength, good tactile elasticity, and is environmentally friendly and odorless. The Mooney viscosity is 60±5 (ML1+4, 100°C), and can be used alone or combined with butyl base rubber, reducing raw material costs by about 20% while ensuring quality.
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