Heat-resistant rubber pipes are mainly used to transport steam or superheated water, etc., and have high requirements for the heat resistance of rubber materials; The outer layer of rubber requires the rubber material to have good heat resistance, weather resistance and certain physical strength. Butyl reclaimed rubber retains the basic performance characteristics of butyl rubber, with good heat resistance and corrosion resistance, which can replace part of butyl rubber to produce the outer layer of heat-resistant rubber hose, and appropriately adjust the production formula, which can effectively reduce the cost of raw materials under the premise of ensuring product quality.
1. Butyl rubber/butyl reclaimed rubber produces a vulcanized formula for the outer layer of heat-resistant hoses
100 parts of butyl rubber, 70 parts of butyl reclaimed rubber, 5 parts of zinc oxide, 1 part of stearic acid, 50 parts of carbon black N550, 100 parts of clay, 2 parts of diethylene glycol, 1.5 parts of accelerator DM, 1 part of sulfur; Total: 330.5 shares.
2. Key points of the design of the vulcanization formula of the outer rubber of the heat-resistant hose produced by butyl reclaimed rubber
(1) Reclaimed rubber mixing: butyl reclaimed rubber has good processing performance, good compatibility with other rubber and compounding agents, and the production of heat-resistant rubber hose outer rubber with butyl rubber can improve the slow vulcanization speed and poor mutual adhesion of butyl rubber E4LYY119. When determining the optimal ratio of butyl reclaimed rubber to butyl rubber in the outer layer of heat-resistant hose, there are a number of factors to consider, including cost, performance requirements, processing technology, and the application scenario of the final product.
(2) Vulcanization system design: The vulcanization system of heat-resistant hose has an important impact on the heat resistance and physical properties of the product; For heat-resistant rubber, peroxide vulcanization systems generally provide the best heat resistance, and butyl rubbers should not be vulcanized with peroxide systems. When producing the outer layer of heat-resistant rubber hose with butyl reclaimed rubber, it is recommended to use resin vulcanization or sulfur vulcanization system; The cost of vulcanization is high and the vulcanization time is long.
(3) Reinforcing filling system: carbon black is a commonly used reinforcing agent, but it is necessary to pay attention to its influence on the heat resistance of butyl reclaimed rubber vulcanized rubber; The use of semi-reinforcing carbon black and general carbon black has better comprehensive performance of butyl reclaimed rubber vulcanized rubber. Inorganic fillers have better heat resistance than carbon black, and white carbon black, calcium carbonate, clay, etc. can be selected as fillers.
(4) Softening system design: softener helps to improve the processing performance of rubber compounds. When using butyl rubber/butyl reclaimed rubber together to produce the outer layer of heat-resistant hose, it is recommended to use petroleum-based high-boiling point operating oil, and try to use less or no low-boiling point softening plasticizers.
(5) Anti-aging system design: when preparing the outer layer of heat-resistant rubber for heat-resistant hoses, butyl reclaimed rubber requires good aging resistance, and it is recommended to choose an antioxidant with good effect on heat and oxygen protection.
When using butyl reclaimed rubber instead of part of butyl rubber to produce the outer layer of heat-resistant hoses, rubber product manufacturers need to adjust the formula according to the working conditions and performance requirements of the hose to achieve the best performance balance; At the same time, the needs of processing technology are considered to ensure that the rubber material has good processing performance; On the premise of ensuring performance, cost optimization is achieved through reasonable selection of raw materials and adjustment of formulas.
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