Yuan Lei tells you about the application of non-metallic mineral materials in the field of rubber.

Release time:

2024-01-29 09:35


Yuan Lei tells you about the application of non-metallic mineral materials in the field of rubber.


At present, rubber products have been radiated to many fields such as daily life, medicine, construction, transportation, machinery manufacturing, etc., and the main raw materials of synthetic rubber must add some non-metallic mineral fillers in addition to various additives and reinforcing agents. Improve the performance of rubber.


For example, heavy calcium carbonate can improve the plasticity of rubber, talcum powder can improve the firmness of rubber, kaolin can improve the hardness of rubber and so on. Therefore, according to the type and amount of non-metallic mineral fillers, the impact on rubber function and the improvement effect are also different.



1. White carbon black


Silica has a good reinforcing effect, which can improve the strength of natural rubber and make up for some congenital functional defects of natural rubber. Because the state of silica mineral is irregular, when it is used as a filler and rubber, the macromolecular double bond inside the rubber matrix is prone to fracture, resulting in negative charge, which accelerates the polymerization and crosslinking speed of rubber macromolecules.


2. Calcium Carbonate


Calcium carbonate is the main low-cost filling material in the rubber industry. The main feature is that it is particularly strong in filling, easy to mix and disperse, and activated with organic matter to obtain active calcium carbonate with fine particles and condensed structure, which can be given from micro-semi-reinforcing to reinforcing performance.


3. Kaolin


Kaolin can improve the elasticity, barrier, elongation and flex resistance of the rubber itself. When kaolinite is modified by processing technology, the surface of kaolinite contains a large number of organic coupling agent molecules, which can be organically combined with the rubber matrix without any rejection reaction. When these coupling agent molecules are in the free state in the rubber, they can be spread all over the corners of the rubber matrix, and the filling effect is better.


4. Talcum powder


Talcum powder is usually divided into general industrial talcum powder and superfine talcum powder, the former as a rubber filler, will not play a reinforcing role, to improve the physical properties of rubber is very little, therefore, general industrial talcum powder is often used as an isolation agent. For ultrafine talcum powder, the reinforcing effect is good. If it is used as a rubber filler, the tensile strength of the rubber itself is equal to the effect of white carbon black.


5. Bentonite


Organic bentonite after nano-modified into nano-organic bentonite, which is widely used in rubber materials, can improve the rubber air tightness, constant elongation stress, tensile strength, heat resistance and wear resistance, corrosion resistance, tear strength and chemical resistance and many other properties.


6. Graphite


Using graphite as rubber filler, similar to the treatment method of montmorillonite, that is, graphite is decomposed by a special process and converted into nano-sized particles. When the nano-particles are combined with the rubber matrix, the functional indicators of the rubber are also improved. For example, electrical conductivity, thermal conductivity, air tightness and mechanical properties have been greatly improved.


7. Dolomite


Dolomite, as a rubber matrix filler, plays the same role as light calcium carbonate. After a large number of experiments, if dolomite is used to replace 50% of light calcium carbonate, the elongation, tear rate and hardness of rubber will be improved accordingly. When dolomite is modified, if silane coupling agent or titanate coupling agent is used, the modified dolomite has stable physical and mechanical properties. Thus, in the transport belt, tires, hoses and other rubber products industry, with dolomite as a rubber filler, the application effect is more ideal.


8. Illite


Illite has a good dispersion, and the internal manganese, copper and other harmful elements content is low, after modification, can be used as a rubber filler. The rubber added with illite is not easy to age, and the constant elongation stress is between the two, while the hardness and elongation at break of the rubber have no large fluctuations.

Non-metallic, rubber, filler, talc, as, able, dolomite, calcium carbonate, modification, matrix

Different applications and specifications of washed kaolin and calcined kaolin


Kaolin is a non-metallic mineral, which is a kind of clay and clay rock mainly composed of kaolinite clay minerals. Because it is white and delicate, also known as white earth. It is named after Gaoling Village, Jingdezhen, Jiangxi Province.

Source Lei gas barium sulfate ten uses


Barium sulfate is based on barite as the main raw material, through beneficiation, ore washing, crushing and other processes. Barium sulfate has a hardness of 3~3.5 (Mohs) and a specific gravity of 4.3~4.7. It has the characteristics of high specific gravity, low hardness and brittleness. Barite is almost insoluble in water, ethanol and acid, soluble in hot concentrated sulfuric acid. With the development of some high-performance barium sulfate products, the application field of barium sulfate is constantly expanding.

Yuan Lei's Little Knowledge | Talcum Powder Classification and Use


The main component of talc is hydrated magnesium silicate, which is monoclinic. The crystals are false hexagonal or rhombohedral flakes. Ores are usually dense massive, leaf-like, radial, fibrous aggregates. Colorless transparent or white, but with a small amount of impurities and light green, light yellow, light brown, light red and even black; cleavage surface was pearl luster. Soft, Mohs hardness 1-1.5, specific gravity 2.7-2.8.