Nitrile reclaimed rubber is a recycled rubber processed from nitrile waste through crushing, desulfurization and other processes, which is an ideal raw material used to replace high-priced nitrile raw rubber to produce rubber products and reduce costs. Nitrile reclaimed rubber has excellent oil resistance, wear resistance and aging resistance; When using nitrile reclaimed rubber to produce rubber products, carbon black is an important reinforcing agent to improve the strength and wear resistance of rubber compounds, and different varieties of carbon black have different degrees of reinforcing effect on nitrile reclaimed rubber vulcanized rubber, which has a great impact on physical and mechanical properties.
Only the rational use of carbon black can meet the physical properties of nitrile reclaimed rubber products.
1. Effect of carbon black on the tensile properties and hardness of nitrile reclaimed rubber vulcanized rubber
When nitrile reclaimed rubber uses reinforcing carbon blacks such as groove carbon black, medium super wear-resistant carbon black and high wear-resistant carbon black, the reclaimed rubber vulcanized rubber has excellent tensile strength, tensile strength and high hardness. In actual production, it is best to use super wear-resistant carbon black to improve the tensile strength of nitrile reclaimed rubber; High structure, high wear resistance, furnace black has the best tensile strength; For elongation, high wear-resistant furnace blacks have smaller values, while general-purpose furnace blacks or hot-cracking carbon blacks have larger values.
The effect of carbon black on the hardness of vulcanized rubber of nitrile reclaimed rubber is consistent with the reinforcing effect of carbon black, and the reinforcing carbon black can improve the hardness of vulcanized rubber. The reinforcing effect of semi-reinforcing carbon black is small, and the hardness is lower when the same amount is combined. In formulations with a certain hardness, the amount of carbon black varies depending on the type of carbon black.
2. Effect of carbon black on compression deformation of nitrile reclaimed rubber vulcanized rubber
When carbon black is used for nitrile reclaimed rubber products, the properties and dosage of carbon black have a great influence on the compression deformation of nitrile vulcanized rubber, and the general trend is that the compression deformation of vulcanized rubber is reduced after filling carbon black. The order of the influence of different varieties of carbon black on the compression deformation of reclaimed rubber is as follows: no carbon black or fine-particle hot-cracking carbon black > medium particle hot-cracking carbon black or medium super wear-resistant furnace black > fine-particle furnace black, fast-pressing furnace black or high wear-resistant furnace black, semi-reinforcing furnace black.
The relationship among the amount of reinforcing carbon black such as high wear-resistant furnace black or groove carbon black and the compression deformation of nitrile reclaimed rubber vulcanized rubber is as follows: in hot air, it increases according to the increase of carbon black dosage, and decreases according to the increase of dosage in hot oil. For other varieties of carbon black, in hot air, the compression deformation of reclaimed rubber vulcanized rubber decreases first and then increases with the increase of carbon black. In hot oil, the compression deformation of vulcanized rubber increases with the increase of carbon black dosage.
3. Effect of carbon black on the elasticity of nitrile reclaimed rubber vulcanized rubber
Carbon black affects the elasticity of nitrile reclaimed rubber vulcanized rubber. Generally, the particle size of high-reinforcing carbon black and medium-super wear-resistant furnace black is small and the elasticity is low; The low-grained hot-cracking carbon black makes the vulcanized rubber show good elasticity. The degree of influence of various rebound rates is in the following order: when there is no carbon black, medium particle hot cracking carbon black, fast pressing furnace black, fine particle furnace black, high wear-resistant grinding furnace black.
In summary, fine-particle carbon black can improve the tensile tensile and wear resistance of vulcanized rubber of nitrile reclaimed rubber, and the groove carbon black has good tensile strength, elongation, tear resistance and wear resistance. High wear-resistant carbon black can give vulcanized rubber good tensile strength and aging resistance, and coarse-grained soft carbon black is conducive to improving the rebound rate of rubber compound. Therefore, two or more kinds of carbon black can be used in the production of nitrile reclaimed rubber 2SLYY1128 products to meet different physical property requirements. When using nitrile reclaimed rubber to produce sealing products, the compression deformation and elasticity of nitrile reclaimed rubber vulcanized rubber are very important; When the feeding material is required to have a small compression set and large elasticity, it is recommended to use semi-reinforcing carbon black or pyrolysis carbon black.
The dosage of groove carbon black in the formula of nitrile reclaimed rubber products is generally about 50 parts, the dosage of high wear-resistant furnace black is 50-70 parts, and the dosage of semi-reinforcing carbon black is among 60-100 parts. In the future, Xiaobian will continue to share with you the specific usage and dosage of carbon black in the vulcanization formula of different varieties of nitrile reclaimed rubber products.
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