Natural rubber has good elasticity, wear resistance, tensile strength and elongation, and is widely used in the tire industry. In actual production, the cost of rubber inner tubes processed from natural rubber as the main raw material is high, and the air tightness, heat resistance and aging resistance of the finished product are poor; The appropriate use of latex reclaimed rubber can not only reduce the cost of raw materials, but also improve the processing technology performance and aging resistance of natural rubber inner tubes.
1. Selection tips for latex reclaimed rubber for natural rubber inner tubes
When natural rubber inner tubes are mixed with latex reclaimed rubber, it is necessary to consider the influence of reclaimed rubber on the performance of the inner tube, such as air tightness, elasticity and aging resistance. It is recommended to choose ultra-fine filtration natural latex reclaimed rubber E4LYY44, which has high fineness, no impurities, and better air tightness of vulcanized rubber; It is recommended to choose latex reclaimed rubber with high glue content, which can give the rubber better elasticity. When the natural rubber inner tube is a black product, it is recommended to choose black latex reclaimed rubber, which is lower in cost; Light-colored, colored rubber inner tubes are recommended to be mixed with white latex reclaimed rubber, and the color is easy to match.
2. Natural rubber/latex reclaimed rubber is used to produce rubber inner tube vulcanization formula
70 parts of natural rubber, 30 parts of latex reclaimed rubber, 4.8 parts of zinc oxide, 2.8 parts of stearic acid, 0.5 parts of antioxidant A, 1 part of antioxidant RD, 0.8 parts of paraffin, 7.5 parts of carbon black N330, 35 parts of light calcium carbonate, 14.5 parts of activated calcium carbonate, 9.5 parts of pine tar, 0.9 parts of petroleum jelly, 0.83 parts of accelerator DM, 0.27 parts of accelerator D, 2.1 parts of sulfur; Total: 180.5 copies.
3. Natural rubber/latex reclaimed rubber combined with the production of inner tube formula design points
When the use of latex reclaimed rubber in natural rubber inner tubes reduces costs, a reasonable design of vulcanization formula can further optimize product quality, and comprehensively consider the air tightness, elasticity, flexibility, wear resistance, tear resistance and aging resistance of the rubber compound.
(1) Vulcanization system: sulfur is used as a vulcanizing agent, combined with accelerators such as M/DM, as well as activators such as zinc oxide and stearic acid to control the vulcanization process and give natural rubber/latex reclaimed rubber vulcanized rubber better mechanical strength.
(2) Reinforcing filling system: high wear-resistant carbon black can improve the wear resistance and tear resistance of vulcanized rubber, and give the rubber higher strength; When natural rubber/latex reclaimed rubber is used in combination to produce inner tubes, it is recommended to choose N330 and other products; With an appropriate amount of light calcium, activated calcium carbonate, etc., it can further improve the processing technology performance, vulcanization performance and reduce the cost of rubber compounds.
(4) Softening plasticizing system: using engine oil, naphthenic oil, paraffin oil, etc. as softeners. It should be noted that the increase in the amount of softener and plasticizer will lead to the increase of the air permeability of the rubber compound, and it is recommended to reduce the amount of softener as much as possible under the premise that the process performance of the rubber compound allows.
When using latex reclaimed rubber to reduce the production cost of natural rubber inner tubes, it is necessary to appropriately adjust the proportion of rubber raw materials according to the specific performance needs of inner tube products, such as increasing the proportion of reinforcing agents can improve wear resistance, but may sacrifice a certain flexibility;
Ensure that all compounding agents can be evenly dispersed during the mixing process to avoid uneven performance; On the premise of meeting the performance requirements of natural rubber inner tubes, the cost is controlled by optimizing the vulcanization formula and production process of natural rubber/latex reclaimed rubber.
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