Carbon black is widely used in the rubber suction cup industry, mainly for reinforcing, coloring, conducting, and improving weather resistance. Since the carbon black production process is carried out at a temperature of 140 to 180 ° C, the carbon, hydrogen, sulfur and ash contained in the raw materials react with oxygen in the surrounding air to produce a large amount on the surface of the carbon black. Contains oxygen functional groups.
These functional groups provide surface activity for carbon black and also become a reaction point for chemical modification of carbon black.
Why do you want to modify carbon black? The answer is simple, because carbon black is a high surface energy substance, it is hydrophilic, and rubber is a hydrophobic substance, so the affinity between the two is poor, and the carbon black particles tend to self-polymerize after entering the rubber. , causing agglomeration, affecting its dispersion in the rubber, and thus unable to fully exert the reinforcing function. Therefore, it is urgent to modify the surface of carbon black. This modification is usually achieved by surface coating, surface adsorption, surface grafting, oxidation, halogenation, and the like. Several modifications are briefly described below.
(1) Coating modification
It is an effective way to mix white carbon black with carbon black and modify the latter. The modified carbon black can make the tire have lower rolling resistance at higher temperatures and higher rolling resistance at lower temperatures, that is, better ground grip and anti-slip effect. The resulting carbon black is fully suitable for the practical use of “green tires”. The key is to coat the surface of the carbon black with a suitable coupling agent, such as silane Si69. Specifically, carbon black is mixed with water-dispersed silica to prepare a slurry, and then a modified material containing silane and a dispersant is added. The silica is coated on the surface of the carbon black. This modified carbon black has been used in “green tires”, which are characterized by energy-saving and environmentally friendly tread rubber.
(2) Adsorption modification
Adsorbing the wetting agent or surfactant on the surface of the carbon black to prevent the re-agglomerated carbon black from re-agglomeration, thereby obtaining a stable dispersion system; or using the strong adsorption effect caused by the difference in charge and polarity of carbon black and rubber Excellent dispersion stability is obtained to prevent it from agglomerating again. An effective wetting agent is cetyltrimethylmaleamide
Type of modified carbon black Ⅰ
2019年4月18日
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Carbon black is widely used in the rubber suction cup industry, mainly for reinforcing, coloring, conducting, and improving weather resistance. Since the carbon black production process is carried out at a temperature of 140 to 180 ° C, the carbon, hydrogen, sulfur and ash contained in the raw materials react with oxygen in the surrounding air to produce a large amount on the surface of the carbon black. Contains oxygen functional groups.
These functional groups provide surface activity for carbon black and also become a reaction point for chemical modification of carbon black.
Why do you want to modify carbon black? The answer is simple, because carbon black is a high surface energy substance, it is hydrophilic, and rubber is a hydrophobic substance, so the affinity between the two is poor, and the carbon black particles tend to self-polymerize after entering the rubber. , causing agglomeration, affecting its dispersion in the rubber, and thus unable to fully exert the reinforcing function. Therefore, it is urgent to modify the surface of carbon black. This modification is usually achieved by surface coating, surface adsorption, surface grafting, oxidation, halogenation, and the like. Several modifications are briefly described below.
(1) Coating modification
It is an effective way to mix white carbon black with carbon black and modify the latter. The modified carbon black can make the tire have lower rolling resistance at higher temperatures and higher rolling resistance at lower temperatures, that is, better ground grip and anti-slip effect. The resulting carbon black is fully suitable for the practical use of “green tires”. The key is to coat the surface of the carbon black with a suitable coupling agent, such as silane Si69. Specifically, carbon black is mixed with water-dispersed silica to prepare a slurry, and then a modified material containing silane and a dispersant is added. The silica is coated on the surface of the carbon black. This modified carbon black has been used in “green tires”, which are characterized by energy-saving and environmentally friendly tread rubber.
(2) Adsorption modification
Adsorbing the wetting agent or surfactant on the surface of the carbon black to prevent the re-agglomerated carbon black from re-agglomeration, thereby obtaining a stable dispersion system; or using the strong adsorption effect caused by the difference in charge and polarity of carbon black and rubber Excellent dispersion stability is obtained to prevent it from agglomerating again. An effective wetting agent is cetyltrimethylmaleamide