Butyl reclaimed rubber is made of waste butyl inner tube desulfurization and refining, which retains the basic performance characteristics of butyl rubber, with high strength, good elasticity and strong air tightness, and can be used alone or in combination with butyl rubber and ethylene propylene rubber to produce rubber products, effectively reducing the cost of raw materials. The tire industry is an important application field of butyl rubber, can butyl reclaimed rubber be used in the tire industry? Which rubber products can use butyl reclaimed rubber? How to work better together?
1. Application and key points of butyl reclaimed rubber in tire inner tube
Automobile inner tube requires rubber with low air permeability, good heat resistance, and has a certain mechanical strength and cold resistance, generally processed with butyl rubber as the main raw material, and the appropriate amount of butyl reclaimed rubber can not only reduce costs under the premise of ensuring the air tightness, heat resistance and aging resistance of the inner tube, but also improve the problem of slow vulcanization speed of butyl rubber, the shrinkage deformation of rubber after extrusion is small, and the dimensional stability of the finished product is higher. The principle of combining butyl rubber/butyl reclaimed rubber with the rubber compound for the production of tire inner tubes is as follows.
(1) It is recommended to use sulfur-accelerator system, for example, the accelerator TMTD/ZDC with sulfur is used, the vulcanization speed is fast, and the comprehensive performance of butyl rubber/butyl reclaimed rubber vulcanized rubber is good.
(2) When butyl rubber/butyl reclaimed rubber is used together to prepare inner tube rubber, the reinforcing system is recommended to be mainly semi-reinforcing carbon black (the dosage is among 50-80 parts) to meet the requirements of low tensile stress of automobile inner tubes; With an appropriate amount of fast-pressed carbon black (about 30 copies), the rubber extrusion process is improved, and the amount of fast-pressed carbon black is too much, and the tire body is easy to expand and crack when the inner tube is set. Light-colored inner tubes can be reinforced with silica or clay and a small amount of polyethylene glycol as an activator.
(3) The plasticizer is recommended to use paraffin oil or naphthenic oil, which can improve the cold resistance of butyl rubber/butyl reclaimed rubber inner tube to a certain extent, and the dosage is determined according to the amount of carbon black, generally among 10-30 parts.
2. Application and coordination points of butyl reclaimed rubber in tire innerliner rubber
Tire innerliner rubber is located inside the tire, near the area where the bead is in contact with the rim, and its main role is to prevent compressed gas leakage. The rubber compound is required to have excellent gas permeability, aging resistance and fatigue resistance, and the unvulcanized rubber compound should have high tensile properties to adapt to the expansion during molding. Generally, chlorobutyl rubber E4LYY82 or bromobutyl rubber are processed as the main raw materials, and the appropriate amount of butyl reclaimed rubber can reduce the production cost. The principle of combining chlorobutyl rubber/butyl reclaimed rubber with the production of innerliner rubber is as follows.
(1) It is recommended to use sulfur-accelerator system for vulcanization system, and use accelerator DM/TMTD with sulfur.
(2) The reinforcing agent is mainly fast-pressed carbon black or general carbon black.
3. Application and matching points of butyl reclaimed rubber in capsules and water tires
Vulcanized capsules and water tires are two commonly used rubber products in the process of tire vulcanization, which need to withstand repeated effects such as heating, cooling, stretching, compression, flexuring and hot water and cooling water during use, requiring the rubber compound to have excellent heat resistance and flexural resistance. When using butyl rubber/butyl reclaimed rubber and glue to prepare vulcanized capsules or water tires, the principle of rubber compound matching is as follows.
(1) It is recommended to use phenolic resin vulcanization system or quinoxime vulcanization system, and butyl rubber/butyl reclaimed rubber vulcanized rubber has better heat resistance.
(2) Use 5-10 parts of neoprene to prevent butyl rubber from returning to its original state of high temperature vulcanization.
(3) The reinforcing system can use high wear-resistant carbon black alone, or use semi-reinforcing carbon black and fast-pressing furnace black, fast-pressing furnace black and easy-to-mix groove black, which has both the extrusion process requirements of butyl rubber/butyl reclaimed rubber inner tube and the comprehensive performance of finished products.
4. The application and coordination points of butyl reclaimed rubber in the diaphragm of force tires and wind tires
Tire diaphragm is a flexible membrane structure used in the vulcanization process of power tires, which is usually installed on the central mechanism of the vulcanizing press. Its main function is to serve as a soft core mold for the setting, pressure filling and heat conduction of the embryo. The tire diaphragm and wind tire rubber are made of butyl rubber as the main raw material, and an appropriate amount of butyl reclaimed rubber is mixed with the formula is similar to the water tire and capsule of the tire, and the resin vulcanization system is mostly used.
Butyl reclaimed rubber is widely used in the tire industry, and we will share with you the vulcanization formula and production process points of butyl reclaimed rubber for various tire products.
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