carbon black in Rubber Products

Non-rubber products are of many varieties, with different conditions of use and performance requirements. According to the main function, the products are divided into: tape, hose, rubber sheet, rubber shock absorption products, rubber sealing products, rubber rollers, conductive or anti-static rubber products, hard rubber and rubber shoes and other major categories of products. And each type of rubber products and according to the purpose, the use of conditions and refined into a number of varieties.

In a wide range of rubber products, due to the application of different varieties of rubber, the use of carbon black is also a big difference.

一、Carbon black application hose

After more than 50 years of development, there are more than 700 hose manufacturing enterprises in China, and more than 140 of them are of certain scale. Great progress has been made in terms of product output, quality, structure, import and export trade and enterprise efficiency. Product performance basically meets the needs of various domestic industries, the overall level is close to or reached the advanced countries. China’s hose production in 2005 reached 370 million standard metres (25.4mm or 1in for the standard diameter). Various types and performance of hose products are widely used in engineering machinery, mining, metallurgy, petroleum, chemical industry, construction, agriculture, forestry, horticulture, automotive, aviation, navigation, medical and other fields. Generally speaking, according to the use of requirements can be divided into ordinary hose and special hose, ordinary hose refers to the delivery of air, other inert gases or water, other neutral liquids at room temperature of the cloth hose; special hose mainly oil-resistant hose, acid and alkali resistant hose, heat-resistant hose, hydraulic hose, mud injection hose, brake hose, diving hose, food hose, hose, hose, medical and so on. All kinds of hose use different requirements, the formula is not the same. In addition to food, medical special hose and light-coloured hose generally do not use carbon black, are no exception to the application of carbon black, or carbon black and other inorganic fillers and used as a reinforcing filling system.

二、Second, ordinary hose

(1) Inner rubber The inner rubber should have certain strong tensile properties, good elasticity and certain aging resistance. In addition, the rubber material should also have good air tightness to ensure that the hose does not leak under pressure. In rubber compounding, natural rubber and styrene-butadiene rubber are generally used, or a combination of natural rubber and styrene-butadiene rubber is used. Reinforcement systems usually use high wear-resistant carbon black (HAF), semi-reinforced carbon black (SRF), general-purpose carbon black (CPF) or a combination of them. Carbon black mainly plays a reinforcing role in rubber and increases the cross-linking density. For example, in natural rubber, it can increase the fixed tensile stress of vulcanized rubber. In synthetic rubber, it can significantly improve the tensile strength of vulcanized rubber. The synthetic rubber tensile strength and fixed tensile stress of ground carbon black are significantly improved. Filled with general carbon black and semi-reinforced carbon black, although the tensile strength and constant tensile stress of the rubber are not as high as those of highly wear-resistant and other active fine particle carbon black haniwa filling rubber, the better the elasticity, the higher the elongation at break. High, thereby improving the bending performance of the rubber. Soft rapid extrusion carbon black (N550) has moderate particles and a higher structure than other soft carbon blacks, which is beneficial to extrusion hose molding. It has a smooth surface and stable dimensions. It is also commonly used for carbon black filling of hose products and hose rubber. The amount is generally 40 to 50. In addition, inorganic materials are often added. In addition to silica, they are often used together with inert fillers such as calcium carbonate and ceramics and carbon black. Sometimes the amount of inorganic filler is larger, usually 30 to 90 parts. A large amount of inorganic fillers can be added to the rubber inner layer to effectively reduce rubber costs.

(2) Outer rubber The outer rubber is the main part of the hose. The outer layer of rubber must meet the needs of the use environment and working conditions to protect the skeleton layer from external damage. Hoses are often twisted, pulled, and in contact with the ground by external forces during use, so they are required to have good tensile resistance, tear resistance, and wear resistance. Hoses that are exposed to the atmosphere for a long time or used in harsh climate conditions must have excellent aging resistance. The rubber is usually based on chloroprene and can be used together with natural rubber. Carbon black generally uses high wear-resistant carbon black and semi-reinforced carbon black. The dosage is slightly less than the amount of carbon black in the inner layer of rubber, 35 to 40 parts, to make the rubber have stronger tensile properties. This rubber can meet the above performance requirements.

(3) Rag glue: Rag glue is mainly distributed in the middle layer of the hose to firmly combine the skeleton layer with the inner and outer layers of glue. The rubber layer requires the rubber material to have good fluidity and be able to penetrate into the structure of fibers and fabrics to improve the bonding strength of each component and play a certain buffering role. Of course, the rubber is also required to have certain strong tensile properties, bending resistance, and fatigue resistance.
The rubber used is mainly natural rubber, and styrene-butadiene rubber, butyl rubber, chloroprene rubber, etc. are suitable. The amount of carbon black used in the friction rubber is lower than that of the inner rubber, which is 35 to 40 parts. Carbon black is commonly used as soft carbon black, such as semi-reinforced carbon black, general carbon black or both. Using soft carbon black, compared with hard carbon black, under the same filling amount, the viscosity of the rubber is smaller and the fluidity is better, which is beneficial to the penetration of the rubber. In addition, the bending resistance and fatigue resistance should be good. Adding inorganic fillers, such as calcium carbonate, clay, etc., can also improve the fluidity of rubber and reduce product costs.

(4) Filling rubber Filling rubber is also called rubber. It fills the gaps between the skeleton layers, plays a buffering role between the skeleton layers, improves the density and integrity of the pipe structure, and reduces friction fatigue. Dynamic and thermal effects between skeleton materials. Rubber selection is the same as rubber rubbing. It is better to use semi-reinforced high wear-resistant carbon black, but the dosage is less than the inner rubber and outer rubber (25~35 parts). An appropriately high dosage of wear-resistant carbon black can improve the rubber material. Strength of.

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