Ultrafine Calcium Carbonate Powder Application in Various Industry
Ultrafine calcium carbonate powder is widely used as a reinforcing filler. As a reinforcing filler, by ultrafine and modified treatment, it becomes ultrafine activated calcium carbonate powder with reinforcing function. Ultrafine calcium carbonate powder are widely used in rubber, plastics, paper, paint, lacquer, printing, cable, leather, medicine and food industries.
Due to the different producing method for calcium carbonate powder, calcium carbonate powder with different crystal shapes, particle sizes, purity, and whiteness can be obtained. With different surface treatment agents and dispersants, the ultrafine calcium carbonate powder can be modified for different functions.
The properties and uses of ultrafine calcium carbonate powder have a lot to do with its particle size. Ultrafine calcium carbonate is an ultrafine white powder with a particle size of only 0.02-0.1μm. Its main characteristics are not only determined by the size, but also It depends on the complexity of the structure and the surface activation. Because of this “three characteristics”, it has good dispersion performance in rubber and plastic products, smooth surface, high elongation, high tensile strength, and strong tear resistance. Bending resistance and crack resistance are very good. It is an excellent reinforcing filler material and has been widely used in various industrial sectors.
Ultrafine Calcium Carbonate Powder Application in Rubber Industry:
Calcium carbonate powder with different characteristics has different influences on rubber physical property. With ultrafine calcium carbonate powder filling, the rubber can have strong tensile strength, reduce the wearing degree, increase tear strength and increase the bending times. For the refinement and structure of calcium carbonate, the specific surface area is generally used.
The specific surface area of coupled calciumcarbonate is about 5㎡/g, while the specific surfacearea of ultra-fine calcium carbonate, such as Bai Yanhua produced in Japan, canreach 81㎡/g. In rubber, calcium carbonatepowder with different fineness and physical properties can have differenteffects.
A Japanese patent pointed out that thespecific surface area of calcium carbonate can be greatly increased by addingcertain substances, such as adding ZnSO4 or water glass to make the specificsurface area of calcium carbonate reach 95㎡/g.It is used for styrene butadiene rubber. The growth rate and the tear strengthcan reach 82% and 220kg/c㎡ respectively. Addingultrafine calcium carbonate can also improve its flame retardancy. Experimentshave shown that ultrafine calcium carbonate can delay the vulcanization tendency,increase the scorch time, and improve the scorch resistance which can be usedin hot water bottle products:
Superfine calcium carbonate rubber filler has the following advantages in rubber industry:
- Improve the mechanical properties of rubber products.
2.The reinforcing filler plays a role of dilution.
3.Improve the dispersibility of the filler, because it can be better mixed withthe elastomer, leading to the improvement of the properties of the vulcanizedproduct.
4.The appearance is improved and the surface smoothness is better.
Application of Superfine Calcium Carbonate Powder in Paper Industry
Generally speaking, the finerthe calcium carbonate particles in the coating material, the better the glossof the coating layer. Therefore, it is possible to produce printing paper withexcellent whiteness, opacity and ink absorption. The calcium carbonate used ispreferably ultra-fine powder (particle size 0.1~0.5μm), the narrower theparticle size distribution range, the better the quality.
A recent Japanese studypointed out that a specific polymer compound is used to coat calcium carbonatefine particles, with an average particle size below 2 μm and a narrow particlesize distribution. Paper filled with this ultra-fine calcium carbonate, thegloss, opacity, and ink absorption are good, and it can be used as a variety ofadvanced printing papers.
The ZG301 paper-making calciumcarbonate cube crystal developed in our country is used for papermaking, featuringwith white color, light weight, good elasticity, high smoothness, good inkprinting performance, suitable for high-speed printing, and good printingresults have been achieved.
The Application of Ultrafine Calcium Carbonate in the Plastic Industry
For plastics, calciumcarbonate can only be as filler, and its addition always reduces the tensilestrength of the plastic more or less, reducing the elongation and graduallyincreasing the hardness.
In view of this situation, the surface activation treatment of calcium carbonate is required. Generally, the commonly used active agents include titanate coupling agents, stearic acid, lignin, etc., among which calcium carbonate treated with stearic acid is particularly suitable for PVC plastics. There are many methods of surface activation treatment, and a variety of surface modifiers can be selected. For example, adding ultlrafine calcium carbonate powder treated with a coupling agent into the polymerization of styrene monomer can make calcium carbonate uniformly distributed in the polymer species.
Ultrafine calcium carbonate powder in plastic products can also reduce the oil absorption value, giving it the following advantages:
① The final product looks good.
② Enhance the mechanical properties of theproduct.
③ Improve the corrosion resistance ofproducts.
In addition, ultrafine calcium carbonate powder can also be used in various sectors such as cables, gloves, food, medicine, etc., which is an ideal reinforcing filler material.
