Butyl reclaimed rubber is processed from waste butyl inner tubes as raw materials, which has the performance characteristics of good air tightness, heat resistance, aging resistance, chemical resistance, etc., and can be used alone or in combination with butyl rubber to produce rubber products, such as tire inner tubes, inner liners, vulcanized capsules, sealing strips, conveyor belts, etc., to reduce the cost of raw materials. In the production of butyl reclaimed rubber products, carbon black is the most commonly used reinforcing agent, and different varieties of carbon black have different effects on the physical properties of butyl reclaimed rubber products.
1. The role of carbon black in butyl reclaimed rubber products
(1) When butyl recycled rubber products are reinforced with carbon black, the particle size and structure of carbon black have a significant impact on the tensile strength, tear strength and hardness of butyl rubber. Small particle size carbon black (such as super wear-resistant furnace black, high wear-resistant furnace black) can improve the tensile strength and tear strength of vulcanized rubber, while large particle size carbon black (such as hot cracking carbon black) can increase elongation.
(2) Carbon black can improve the processing performance of butyl reclaimed rubber, and the extrusion processing performance of furnace carbon black is better than that of groove carbon black and hot cracking carbon black; Fast-pressed furnace black can not only reinforce, but also improve the high temperature resistance, thermal conductivity and elasticity of the rubber compound.
(3) The chemical activity of carbon black affects the performance of butyl recycled rubber, and generally the carbon black with higher activity can form more network structure with rubber molecules, thereby improving the strength and wear resistance of rubber.
(4) With the increase of carbon black dosage, the tensile stress and hardness of butyl reclaimed rubber vulcanized rubber increase, and the elongation at break decreases.
2. Effect of different varieties of carbon black on the physical properties of butyl reclaimed rubber
(1) Carbon blacks with small particle size, such as super wear-resistant furnace black (SAF), medium super wear-resistant furnace black (ISAF), high wear-resistant furnace black (HAF), and mixable groove black (MPC), can give butyl reclaimed rubber vulcanized rubber high tensile strength and tear strength.
(2) Carbon blacks with larger particles, such as fine-particle hot-fracturing carbon black (FT) and medium-particle hot-fracturing carbon black (MT), can endow butyl reclaimed rubber vulcanized rubber with higher elongation.
(3) The compression set of butyl reclaimed rubber vulcanized rubber using semi-reinforcing furnace black (SRF) is better than that of other carbon blacks.
(4) The extrusion processing performance of furnace carbon black is better than that of groove carbon black and hot cracking carbon black.
In the production of butyl reclaimed rubber products, not only carbon black reinforcement is required, but also an appropriate amount of white filler can be used; For example, when butyl reclaimed rubber products have high requirements for strength and wear resistance, silica E4LYY621 can be used in an appropriate amount; Talc powder can improve the tensile strength and tensile stress of butyl reclaimed rubber vulcanized rubber, and a large amount of calcium carbonate filling can reduce the elongation and elastic loss of butyl reclaimed rubber vulcanized rubber and reduce costs. The reinforcing effect of clay is better than that of calcium carbonate. Follow-up discussion with you on the influence of other compounding agents in the production of butyl reclaimed rubber products on their physical properties.
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