Ultrafine calcium carbonate refers to calcium carbonate with primary particle size between 0.02-0.1μm. It was first developed in Japan and is the cheapest nanomaterial. It has special quantum size effect and small size effect. , surface effect, which makes it show obvious advantages compared with conventional powder materials in terms of reinforcement, transparency, dispersion, thixotropy and leveling, especially active ultrafine calcium carbonate, which has functional fillers Its characteristics greatly broaden its scope of application, and its toughening and reinforcing effect greatly improves and improves the performance and quality of products in related industries.
Ultrafine calcium carbonate is widely used in rubber, plastic, paper, ink, paint, health food, feed, daily chemical, pharmaceutical and other fields.
Ultrafine calcium carbonate can be used as a filler in high-end cosmetics, soaps, facial cleansers, and children’s toothpaste. In the industry, ultrafine calcium carbonate is an important component and calcium source additive in the culture medium. It is used in the production of antibiotics as a buffer for microbial fermentation, and also plays a certain pharmacological role in analgesics and stomach medicines.
The rubber industry is one of the largest users of my country’s ultra-fine calcium carbonate industry. The elongation, tear resistance, compression deformation and flex resistance of rubber products added with ultra-fine calcium carbonate are significantly better than those added with general Products of calcium carbonate. In addition, ultrafine calcium carbonate also has good reinforcing and whitening effects, and can be made into transparent and translucent rubber products. The application of ultra-fine calcium carbonate in rubber, the finer the particles, the larger the specific surface area of the rubber interwetting, so that it becomes more and more difficult to disperse the calcium carbonate particles, especially when the particle size is below 0.1 μm, due to the increase of surface energy, in When rubber is mixed, it is easy to generate heat and cause sticking. Therefore, in order to make it play its real advantages and overcome the shortcomings in the application, the formula design should be adjusted during the blending, the composition of the components should be reasonable, the order of feeding and the operating temperature during the blending It is necessary to optimize or select other suitable auxiliary dispersants to improve the blending and dispersing effect.
In addition, the higher the oil absorption value of ultra-fine calcium carbonate for rubber, the better the wettability and reinforcement of calcium carbonate to rubber. Through application, it is found that among the ultra-fine calcium carbonate of different crystal forms, the chain-like ultra-fine calcium carbonate It has the best reinforcing effect on rubber.