In order to meet the market demand for calcium carbonate in plastics, papermaking and coatings industries, in recent years, many new equipment and new production lines have been introduced or developed on their own to produce fine, ultra-fine and nano-level calcium carbonate. The plastics industry is the main source of calcium carbonate. One of the end markets has a profound impact on the development of the calcium carbonate industry.
The influence of calcium carbonate content on plastic modified masterbatch
Calcium content is an important quality technical indicator of calcium carbonate. The modified masterbatch has higher requirements for the content of calcium carbonate, generally above 98%. The higher the calcium content, the more stable the processing properties of calcium carbonate. When the calcium content is low, it will increase the content of heavy metals and other non-metallic impurities, which not only affects the use of calcium carbonate, but also affects the processing technology, affects product quality, or causes harm to processing equipment.
The effect of calcium carbonate whiteness on plastic modified masterbatch
The whiteness of calcium carbonate directly affects the whiteness and coloring of the modified masterbatch. The modified masterbatch has very strict requirements for the whiteness of calcium carbonate. More than a decade ago, the whiteness requirements of 400 mesh calcium carbonate by manufacturers were generally 92. -93%. With the increasing use of modified masterbatch, the whiteness requirement of calcium carbonate is getting higher and higher. At present, the whiteness of 400 mesh calcium carbonate requires more than 95%, and the whiteness of calcium carbonate processed by some ore can reach about 97%.
The influence of the moisture of calcium carbonate on the plastic modified masterbatch
The raw materials of calcium carbonate-natural marble, calcite, etc., generally do not contain structural water. After being processed into superfine powder, it is very easy to absorb moisture during processing, storage and transportation. Calcium carbonate sometimes contains traces of volatile matter. If the content of these substances is too high, it will affect the modified masterbatch and plastic Products have an impact.
The influence of calcium carbonate particle size distribution on plastic modified masterbatch
The particle size distribution of calcium carbonate is an important quality control index for the modified masterbatch. In practical applications, the particle size distribution range of granular materials such as calcium carbonate fluctuates greatly. The narrower the particle size distribution range, the more stable the performance of the material, and the wider the particle size distribution range, the worse the performance of the material. For example, calcium carbonate of 1250 mesh should have a particle size of about 10μm. If the particle size is distributed between 5-38μm, although the theoretically calculated average particle size can be close to 10μm, due to the small particle size and large specific surface area, it is easy to aggregate into clusters; The assembly causes the surface roughness of the product, so its processing performance and mechanical properties will be affected.
The influence of calcium carbonate particle shape on plastic modified masterbatch
According to the different mineral structure, the particle shape of calcium carbonate can be divided into multi-cube, flat, multi-prism, cuboid, long rod, and other irregular shapes.
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