Yuan Lei's Little Knowledge | (I) of Inorganic Fillers Commonly Used in Tire Rubber

Release time:

2024-01-29 09:34

Inorganic fillers commonly used in tire rubber

Tire is one of the main branches in the field of rubber. In tire rubber, the amount of rubber filler has accounted for more than 2/3 of the amount of tire rubber formula, so rubber filler is the most important compound material in tire rubber composition. At present, the tire rubber commonly used functional filler has the following:

01 Carbon Black

Carbon black is a widely used chemical products, about 70% of the carbon black used in the tire industry, which can not only improve the strength of the product, but also improve the processing performance, and give the product wear resistance, tear resistance, heat resistance, cold resistance, oil resistance and some special properties, so that the service life of the product is extended.



02 white carbon black

Because of its unique structure and surface chemical properties, silica has been widely used in the tire industry, including truck tires, car tires, agricultural tires, etc.; according to the cord material, it is divided into all-steel, semi-steel and fiber cord tires, The use of parts include tread, belt, sidewall and steel wire adhesive.

Silica with surface hydroxyl and adsorption of water, usually need to be surface modification can be applied to the field of rubber, the most commonly used in combination with silica modifier is silane coupling agent, the hydroxyl formed after hydrolysis and silica surface active groups react to form hydrogen bonds, and then condensed into covalent bonds, making the silane coupling agent and silica solid combination.



03 Calcium Carbonate

Calcium carbonate used in tires is mainly ultrafine active calcium carbonate, which means that an appropriate amount of active agent is added to cover the surface of the particles in the process of manufacturing calcium carbonate to increase the activity of calcium carbonate.

Because the surface of ultrafine active calcium carbonate particles is covered with active covering layer, it has good affinity with rubber, is easy to disperse during mixing, has low heat generation of rubber compound, small breaking permanent deformation, good elasticity, certain reinforcement and low price. It is commonly used to replace semi-reinforced carbon black or partially replace other carbon black, and is used for agricultural tires and light truck tire cord rubber, and load truck tire inner rubber, automotive tire inner tire rubber, cushion belt rubber and white sidewall rubber, especially in the inner and outer tire rubber of the car tire, to reduce product costs, improve the process performance and certain physical properties of the rubber compound.



04 Montmorillonite

Montmorillonite is a layered silicate, which can be filled into natural rubber by organic modification, which can significantly increase the tear strength and hardness of NR. When the number of filling is small, the comprehensive performance is better than that of silica, and it is a cheap natural inorganic filler that can replace silica.



05 Barium Sulfate

Barium sulfate is mainly used as an inert filler or colorant in rubber. The vulcanized rubber has the characteristics of small compression deformation and large flexibility, which can give the product acid resistance, so it is often used as a characteristic filler in acid-resistant products.

At present, most of the steel wires used in the tire bead should be acid treated to remove the surface oil and improve the adhesion with the rubber. Therefore, it is necessary to use a certain amount of barium sulfate in the steel wire rubber to enhance its acid resistance. Previously, precipitated barium sulfate was used, the adhesive force between the rubber compound and the steel wire was low, and the surface of the steel wire was seriously sprayed. However, when active barium sulfate was used, the general performance of the rubber compound was similar to that of precipitated barium sulfate, but the extraction force of the steel wire was obviously improved, the extrusion process performance was excellent, the bead spray phenomenon was obviously reduced, the durability of the finished product was normal, and the price of active barium sulfate was lower than that of precipitated barium sulfate, which could improve economic benefits. Therefore, active barium sulfate can completely replace the traditional precipitated barium sulfate for tire steel rubber.



Tire, rubber, barium sulfate, silica, rubber compound, calcium carbonate, surface, active,

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