Calcium carbonate has been widely used in paints, coatings, papermaking, daily chemicals, building materials, medicine and other industries, is the most important type of inorganic materials used in plastics, about 80% of PP, PE products add calcium carbonate to fill modified masterbatch.
Heavy calcium has also been used in PS and ABS sheets, packaging materials, injection molding, etc. PVC sheets, sheets, decorative materials, profiles, pipes and other products used to mainly use light calcium.
The use of calcium carbonate as an inorganic filler in plastics has the following advantages:
Abundant resources and low cost.
Non-toxic, odorless and non-irritating.
The color is white, easy to color, and it has little interference with other colors.
The hardness is low, and the wear and tear of processing equipment and molds is light.
It has good chemical stability and does not react chemically with most matrix plastics.
Good thermal stability, thermal decomposition temperature above 800.
Easy to dry, no structured water.
After surface activation modification, it has good compatibility and melt fluidity with plastics, and can also improve the physical properties of plastic products.
In the various inorganic powder materials used every year, the amount of calcium carbonate reaches more than 60%, and calcium carbonate can be seen everywhere in life
1) Calcium carbonate filled modified masterbatch has been widely used in woven bags, woven fabrics, woven nets, shade nets and round wires, flat wires, non-woven products, the addition amount is generally 5% 20%, some as high as 30% 40%. It has the advantages of improving the printability, hand feeling, shrinkage, production efficiency, and production cost of plastic products, and has become an indispensable filling modification material for this type of product.
2) The filling modified masterbatch used in agricultural mulch film, lining film, packaging film and other film products has higher requirements for product quality and addition amount, and CaCO3 above 1250 mesh is generally selected, which is conducive to the natural degradation of waste film. The finer the particle size, the smaller the influence of light transmittance, the better the physical properties, the narrow particle size distribution, and the stable product quality.
3) A large number of shopping bags used at home and abroad need to add a certain amount of calcium carbonate, some of which are as high as 30%, which is conducive to the degradation and treatment of plastic packaging products, and has received great attention and attention from all walks of life.
4) It is widely used in various water conservancy projects and roads, dams, etc. The addition of about 10% ultra-fine heavy calcium masterbatch to this kind of product can reduce production costs and improve the physical properties of products.
5) The cast film for the production of disposable tablecloths, pads, ponchos, masks, sanitary clothes, packaging films, and sanitary napkins has been widely used in recent years. This kind of product is generally added with 20% 40% ultra-fine heavy calcium masterbatch, up to about 50%, the heavy calcium in the masterbatch is small, narrow distribution, high health indicators, in reducing the cost of the product at the same time, to improve the hygroscopicity and excellent appearance, feel and other requirements.
6) Injection molding products are widely used and varied, because the injection molding process is in a short period of time (a few seconds or tens of seconds) the material is injected into the mold cavity and rapidly cooled and coagulated under the molten state and high temperature and high pressure production process, and meets the shape requirements, volume appearance, product use, performance indicators and other conditions of plastic products. After adding calcium carbonate, the shrinkage rate of the product can be significantly reduced, the printability can be improved, and the appearance effect and hand feel can be improved.
7) The amount of calcium carbonate added to PVC profiles, pipes and plates is about 20% to 50%. In the past, light calcium was mainly used, and at present, heavy calcium + light calcium, heavy calcium and other applications are more.
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