Butyl inner tubes processed from butyl rubber as the main raw material have excellent air tightness, heat resistance, aging resistance, chemical corrosion resistance, and low heat generation when the vehicle is driving at high speeds, and are widely used in the inner tubes of various tires. Butyl reclaimed rubber retains the basic performance characteristics of butyl rubber, and can be used in combination with butyl rubber to produce butyl inner tubes in an appropriate proportion to reduce costs. When butyl rubber/butyl reclaimed rubber is used together to produce inner tubes, the amount of carbon black directly affects the physical and mechanical properties, processing properties and finished product quality of the inner tubes.
1. Effect of carbon black dosage on the physical and mechanical properties of butyl rubber/butyl reclaimed rubber
When using butyl rubber/butyl reclaimed rubber and rubber to produce inner tubes, with the increase of carbon black dosage, the tensile strength of vulcanized rubber usually increases first and then decreases, the tearing elongation decreases first with the increase of carbon black dosage E4LYY531 and then rises slightly, the hardness increases significantly with the increase of carbon black dosage, the elasticity decreases first and then tends to stabilize with the increase of carbon black dosage, the heat generation increases with the increase of carbon black dosage, and the tear strength increases first and then decreases with the increase of carbon black dosage. With the increase of carbon black dosage, the aging resistance first increases and then tends to be stable.
2. Effect of carbon black dosage on the processing performance of butyl rubber/butyl reclaimed rubber
With the increase of carbon black dosage, the processing performance of butyl rubber/butyl reclaimed rubber combined rubber first improved and then deteriorated with the increase of carbon black dosage, and the scorching time shortened with the increase of carbon black dosage, and the vulcanization speed accelerated.
3. The ideal amount of carbon black when using butyl rubber/butyl reclaimed rubber together to produce inner tubes
When butyl rubber and butyl reclaimed rubber are used together to produce inner tubes, the amount of carbon black is controlled among 50-70 parts, the scorching time and vulcanization speed of the rubber compound are moderate, and the comprehensive performance of vulcanized rubber is good; Although too much carbon black can improve the hardness of vulcanized rubber, the tensile strength and tear performance will decrease. The combination of fast-pressed carbon black and semi-reinforcing carbon black can significantly improve the dispersion and processability of rubber compounds.
4. Butyl rubber/butyl reclaimed rubber is used to produce a vulcanized formula for inner tubes
(1) 90 parts of butyl rubber, 10 parts of butyl reclaimed rubber, 4.5 parts of zinc oxide, 1 part of stearic acid, 32 parts of carbon black N550, 22 parts of carbon black N774, 17 parts of paraffin oil, 0.5 parts of accelerator DM, 0.9 parts of accelerator TMTD, 1.5 parts of sulfur; Total 179.4 copies.
(2) 70 parts of butyl rubber, 30 parts of butyl reclaimed rubber, 3.5 parts of zinc oxide, 0.8 parts of stearic acid, 25 parts of carbon black N550, 20 parts of carbon black N774, 2.5 parts of paraffin oil, 0.3 parts of accelerator DM, 0.8 parts of accelerator TMTD, 1.3 parts of sulfur; Total 151.7 copies.
Compared with butyl rubber, the price of butyl reclaimed rubber is low, and the mixing of butyl reclaimed rubber in rubber inner tubes can reduce the amount of butyl original rubber and reduce the cost of raw materials; Butyl reclaimed rubber has good processing performance, and when used in combination with butyl rubber, it can improve the dispersion and uniformity of the rubber compound, and improve the extrusion performance of the rubber compound. When butyl rubber/butyl reclaimed rubber is used together to produce inner tubes, the amount of rubber oil will also affect the performance of the inner tubes.
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