EPDM rubber has excellent heat, weather and ozone resistance, and is widely used in the production of rubber pipes with strict requirements for heat resistance, corrosion resistance and aging resistance, especially for the production of steam-resistant hoses. EPDM reclaimed rubber retains the basic performance characteristics of EPDM original rubber, can it be used to produce EPDM rubber hoses? What should be paid attention to when using EPDM reclaimed rubber to reduce the cost of raw materials for EPDM hoses?
1. The advantages of EPDM rubber pipe mixed with EPDM reclaimed rubber
When using EPDM rubber as the main raw material to produce rubber pipes, EPDM rubber itself has a high price, poor blendability with other rubber rubbers, and there are problems such as slow vulcanization speed and poor adhesion in the processing process. EPDM reclaimed rubber has excellent high and low temperature resistance and aging resistance, which can replace a certain proportion of EPDM raw rubber to produce rubber pipes, reduce the cost of raw materials and improve the processing performance of rubber compounds. EPDM reclaimed rubber has better fluidity and plasticity, less expansion and contraction, less processing heat, and the EPDM rubber hose mixed with EPDM reclaimed rubber has better processing performance and more stable finished product size.
2. Application of EPDM reclaimed rubber in rubber pipes
(1) Separate use of EPDM reclaimed rubber to produce rubber pipes: directly replace EPDM rubber to produce rubber pipes, effectively reducing the cost of raw materials.
(2) EPDM reclaimed rubber and EPDM rubber can be used together to produce rubber pipes: EPDM reclaimed rubber can be used in combination with EPDM rubber in any proportion to produce cost-effective rubber pipes to meet the needs of different users and reduce more raw material costs on the premise of ensuring product quality.
(3) EPDM reclaimed rubber is used in combination with other varieties of rubber to produce rubber pipes: Compared with EPDM rubber, EPDM reclaimed rubber has better blendability with other varieties of rubber, and can be used in combination with butyl rubber and butyl reclaimed rubber to produce rubber pipes, reduce the cost of raw materials and prolong the aging time of hoses.
3. Precautions for the design of EPDM reclaimed rubber production rubber pipe formula
When using EPDM reclaimed rubber to produce cost-effective rubber pipes, the vulcanization system has a great impact on the heat resistance of the hose, and it is recommended to use the oxide vulcanization system when the hose is required for heat resistance, forming more carbon-carbon bonds E4LYY122 and monosulfide bonds, less polysulfide bonds, and better heat resistance of reclaimed rubber vulcanized rubber. In the reinforcing filling system, inorganic fillers have better heat resistance than carbon black. Appropriate use of operating oil and polyester plasticizer to improve the processing performance of EPDM rubber and increase the plasticity of the rubber compound. EPDM recycled rubber itself has good anti-aging performance, and antioxidants with good protection effect on heat and oxygen can be selected to delay the aging time of rubber tubes.
4. Key points of the production process of EPDM reclaimed rubber production rubber pipes
Compounding is an important step in the production of EPDM hoses, which can be carried out by open mill or internal mixer. In the mixing process, EPDM recycled rubber needs to be evenly mixed with various compounding agents (such as zinc oxide, stearic acid, carbon black, paraffin oil, etc.); For mixing, zinc oxide, carbon black, stearic acid and oil can be pre-mixed and then added to the raw rubber.
The production of EPDM hoses typically involves extruding the inner tube, then adding a reinforcing layer (such as aramid thread or polyester thread), and finally extruding the outer tube. Vulcanization is a critical step in the production of rubber products, which determines the physical properties and service life of the hose. EPDM hoses can be vulcanized in a vulcanization tank, and with proper temperature and time control, the rubber material undergoes a chemical reaction to form a network of macromolecules.
When using EPDM reclaimed rubber to produce rubber pipes, it is necessary to strictly control the Mooney viscosity, scorch time, vulcanization speed and other parameters of the rubber compound to ensure the quality and performance of the hose. We will continue to discuss relevant issues with you in the future.
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