Application of calcium carbonate in rubber products

After years of application practice shows that calcium carbonate can not only reduce the raw material cost of plastic products, but also has the effect of improving some properties of plastic materials, research in recent years is to obtain gratifying results, research results of many scientific research units show that different types of calcium carbonate in the use of the time, can significantly improve the performance of rubber products. Among them, active calcium carbonate as a high filling amount of high-grade filler, widely used in rubber, plastics, plastic steel doors and Windows, PVC cable material, advanced coatings, pipes, tires, soles, polyethylene blown film, sealing rubber strip, glass steel products, cable packaging cloth, paper, building materials, ink, daily chemical, textile, and other industries.

Application of heavy calcium carbonate in rubber field

The mechanical properties of heavy calcium carbonate vulcanizates are not as good as those of light calcium carbonate and modified calcium carbonate vulcanizates, and the large particle size of heavy calcium carbonate particles will cause the physical and mechanical properties of vulcanizates to decrease significantly. However, its production cost is low, and its use in rubber with other reinforcing agents or fillers can adjust the properties of vulcanized rubber and reduce production costs.

Heavy calcium carbonate is widely used as inert filler for natural rubber, styrene butadiene rubber, latex, etc., suitable for the manufacture of heels, soles, floors, rubber hoses, foam products, molded products and pressed products.

Application of light calcium carbonate in rubber field

Light calcium carbonate powder has the characteristics of regular particle shape, narrow particle size distribution and small particle size. It is mainly used as a reinforcing filler for white or light-colored rubber in rubber products.

Light calcium carbonate has semi-reinforcing properties, which can improve the tensile strength, tear strength and wear resistance of vulcanized rubber, and will not lead to too high fixed elongation stress under high filling, and it is easy to disperse in the rubber material and does not affect vulcanization. The physical and mechanical properties of the vulcanizates filled with light calcium carbonate are slightly higher than those filled with heavy calcium carbonate.

Application of activated calcium carbonate in rubber field

Compared with the modified calcium carbonate, the modified calcium carbonate generally has the characteristics of smaller particle size, lower oil absorption value, better dispersion and better reinforcement.

The reinforcing property of modified calcium carbonate is much better than that of unmodified calcium carbonate. Its reinforcing property is mainly due to the fact that the surface modifier is an organic matter with amphiphilic groups, that is, it has hydrophilic groups and oilphilic groups. The surface modifier closely binds calcium carbonate and rubber together through the two groups, which is beneficial to improving the physical and mechanical properties of rubber and improving the processing properties. And improve the product elongation, tensile strength, tear strength and other properties.

Application of nano-calcium carbonate in rubber field

Nanometer calcium carbonate has high activity, and its reinforcing property is much higher than that of light calcium carbonate, which is equivalent to precipitated white carbon black. Nano calcium carbonate has good dispersibility and compatibility in rubber, which can make rubber easy to mix and disperse, improve the processing property of rubber, and improve the mechanical properties of products. At the same time, nano-calcium carbonate has a three-dimensional structure and various particle forms. It is found that the reinforcing effect of different crystalline nano-calcium carbonate on rubber is different, and the interlocking nano-calcium carbonate has the best reinforcing effect on rubber.

It is worth noting that it can not only be used as a reinforcing filler alone, but also can be used in combination with other fillers according to production needs, not only can achieve the role of reinforcing, filling, improving processing technology and improving product performance, but also has a whitening effect and partially replace white carbon black, titanium dioxide and other expensive white fillers.

Sum up

Calcium carbonate is one of the main filling and reinforcing agents used in rubber industry. Among them, heavy calcium is mainly used as a filler to reduce costs; Light calcium has semi-reinforcing properties, which can improve the physical and mechanical properties of vulcanized rubber. Nano-calcium carbonate and modified calcium carbonate have superior reinforcing properties, but also have color whitening effect, and can partially replace expensive white carbon black, titanium dioxide and so on. In summary, the future rubber calcium carbonate will gradually develop from heavy calcium or light calcium to nano-calcium carbonate and modified calcium carbonate.