At present, rubber products for applying nanometer calcium carbonate at home and abroad mainly include: tires, rubber shoes, hoses and tapes, wires and cables, rubber rollers, etc.; rubber seal products, vibration damping products, and rubber products for medical and food use. For rubber, calcium carbonate is the third largest reinforcing filler after carbon black and white carbon black. It has the characteristics of low toxicity, low price and good reinforcing effect.
First, the classification of calcium carbonate
According to the processing method, calcium carbonate is divided into three categories: active calcium carbonate, heavy calcium carbonate and light calcium carbonate.
Table 1 Classification of calcium carbonate
kind | Preparation of raw materials | Preparation | application |
Active calcium carbonate | Light calcium carbonate, active agent, coupling agent | Surface treatment | White reinforcing filler |
Heavy calcium carbonate | Calcite, limestone | Dry or wet method | Filler, colorant, release agent, release agent |
Light calcium carbonate | Limestone, water, carbon dioxide | Precipitation | White reinforcing filler |
Second, the application of calcium carbonate in rubber products
1, tire
The calcium carbonate used in the tire is mainly ultrafine active calcium carbonate. Compared with carbon black, since the surface of the ultrafine active calcium carbonate particles is coated with an active coating layer, the affinity of the ultrafine active calcium carbonate to the rubber is good, and it is easy to disperse during kneading, and the rubber has low heat generation and is permanently broken. Small deformation, good elasticity, certain reinforcement, and low price, often used to replace semi-reinforcing carbon black or partially replace other carbon black for agricultural tires and light duty tire curtain rubber, heavy-duty tire inner layer rubber, automobile Tire inner rubber, mat rubber and white tire side rubber, especially for tires (including bicycle inner and outer tires, trolley inner and outer tires, motorcycle inner and outer tires, multi-purpose tires) inner tube and tire rubber to reduce Product cost, improved compound process performance and certain physical properties.
Figure 1 Application of calcium carbonate in tires
2, hose and tape
Calcium carbonate for hoses and tapes is light calcium carbonate and ultra-fine active calcium carbonate. Its function is to reduce the cost of the product. Second, it is used as a white reinforcing filler to facilitate the preparation of light-colored products and to adjust the physical properties of the rubber. The third is to improve the dispersibility and viscosity of the rubber compound, and to help the rubber compound to bond with the short fiber filler and the skeleton material. Light calcium carbonate and ultra-fine active calcium carbonate are generally used in rubber hoses for short fiber reinforced rubber hose, hydraulic hose outer rubber, ordinary rubber inner rubber, suction rubber outer rubber, feng shui rubber outer rubber and hose cleaning cloth. Glue, etc.; widely used in tapes for wipers and cover tapes for conveyor belts, drive belts and toothed timing belts.
Figure 2 Application of calcium carbonate in rubber hose
3, rubber shoes
The white reinforcing filler used in rubber shoes should have the characteristics of high whiteness to adapt to different color requirements; certain reinforcing effect and improved rubber processing performance; lower price. Calcium carbonate, especially light calcium carbonate and ultra-fine active calcium carbonate, fully meet these requirements, so calcium carbonate is widely used in rubber shoes, often with carbon black, white carbon black, titanium dioxide, clay and talcum powder and used as rubber shoes. Reinforcing filler for each part.
Figure 3 Application of calcium carbonate in rubber shoes
4, wire and cable
Calcium carbonate is generally used as a wire and cable with white carbon black, LEE white slip powder and clay, including white reinforced filling of soft and hard wire and cable, flame-retardant wire and cable, high and low voltage wire and cable, insulated wire and cable, and mining wire and cable. Agent. In wire and cable as the main material of polyacrylate rubber (ACM), chlorinated polyethylene (CM), calcium carbonate, in addition to acting as a reinforcing filler, also acts as a stabilizer, that is, reduces the acidity and absorption process of the rubber compound. The hydrogen chloride gas produced in the process avoids the vulcanization delay and vulcanization reversion of the rubber compound.
Figure 4 Application of calcium carbonate in electric wires
5, rubber sealing products
In rubber sealing products, calcium carbonate is mainly used for extrusion (sponge) sealing strips, which functions as: reinforcing filler, improving the extrusion process performance of the rubber compound, smoothing the surface of the extruded sealing strip; as a desiccant, Absorb the moisture in the rubber to ensure the foaming rate and extrusion shrinkage of the rubber compound.
Figure 5 Application of calcium carbonate in rubber sealing products
6, other
Because calcium carbonate reinforced rubber has the characteristics of high strength, self-adhesiveness and elasticity, no toxicity and low cost, calcium carbonate, carbon black and white carbon black are often used as rubber rollers, tapes, rubber dams and capsules. Reinforcing filler for rubber products, sponge rubber products, shock absorbing rubber products, etc. for products, medical and food.
With the improvement of people's living standards, the use of rubber products is more and more extensive, and the color is more and more abundant. The ultra-fine active calcium carbonate and light calcium carbonate are fully utilized, and the whiteness is high and the reinforcing property is better. The application of fine active calcium carbonate and light calcium carbonate in brilliant rubber products is also an effective way to expand the application of calcium carbonate.
Calcium carbonate, especially ultra-fine active calcium carbonate, has become a general-purpose reinforcing filler for rubber with good performance, high whiteness and low price. With the development of rubber products in China, the products are widely used, widely used and rich in color. The application will be more extensive.
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