A Comprehensive Overview of the Top Ten Application Fields of Calcium Carbonate(I)

Field 1: Plastic Industry (the largest consumer market for calcium carbonate, accounting for over 40%)

Core Function

1. Can replace resin raw materials in large quantities, significantly reducing manufacturing costs;
2. Enhance product rigidity, heat resistance, and dimensional stability, reduce shrinkage and warping deformation during injection molding and extrusion processes;
3. The use of ultrafine or nano-sized calcium carbonate can help improve impact resistance and surface glossiness, and the addition of PE film can form breathable micropores;
4. Optimize the flowability performance of the melt, shorten the injection molding cycle, and thereby reduce the energy consumption of equipment operation.

Selection and Application Points

1. Pipes, turnover boxes, and packaging products: Use 800-1500 mesh active heavy calcium carbonate with a filling ratio of 30% -50%;
2. PE breathable film and high gloss home appliance shell: Recommended for ultra-fine lightweight calcium or nano calcium with a filling ratio of 10% -25% above 1250 mesh;
3. PLA/PBAT biodegradable plastics: using modified nano calcium, filled with 20% -35%, can regulate the degradation rate.

Precautions

When the filling amount exceeds 45%, it needs to be used together with POE toughening agent; Thin film products are strictly prohibited from using coarse-grained heavy calcium, otherwise it may cause film breakage or sand hole defects.

Field 2: Rubber Industry (commonly used fillers for semi reinforced systems)

Core Function

1. Partially replacing carbon black and white carbon black, reducing the cost of rubber raw material input, suitable for the production of light colored rubber products;
2. Improve tensile strength, tear strength, wear resistance, and flexural aging resistance;
3. Optimize the flow characteristics of rubber mixing and extrusion, shorten the vulcanization time, and reduce the Mooney viscosity.

Selection and Application Points

1. Low end rubber pads and ordinary shoe soles: 400-800 mesh heavy calcium, filled with 30-50 parts;
2. Sealing strips and rubber hoses: 800-1500 mesh active light calcium, filled with 25-40 parts;
3. Tire sidewall and precision silicone rubber seals: using nano calcium carbonate, which can replace about 30% of white carbon black.

Key Points of Process

The segmented mixing method should be adopted - first plasticize the rubber, and then add the powder; The moisture content of calcium powder must be controlled at ≤ 0.2% to prevent bubbles or powder spraying in the finished product.

Field 3: Paper Industry (with both filler and coating pigment functions)

Core Function

As a filler in pulp, it can reduce the amount of wood pulp used, improve paper whiteness, opacity, and breathability, and achieve fiber conservation;

2. Used as a paper coating pigment to improve paper smoothness, ink absorption capacity, and printing glossiness, reducing the use of kaolin.

Selection and Application Points

1. Ordinary writing paper and whiteboard paper filler: 400-1250 mesh ground calcium carbonate, filled with 15% -25%;
2. Copperplate paper coating, inkjet paper, and cigarette paper: Choose ultra-fine light calcium to pursue higher delicacy and gloss.

Hard Limit

Only applicable to alkaline papermaking process routes, calcium carbonate cannot be used in acidic paper systems (it will decompose and fail when exposed to acid); The solid content of the coating slurry should be controlled between 68% and 72%.

Field 4: Coatings and Ink Industry

Core Function

1. Acting as a filler for the body, it can partially replace titanium dioxide and significantly reduce the cost of coating raw materials;
2. Adjust the hardness, scrub resistance, crack resistance, and weather resistance of the paint film;
3. Control the leveling effect, extinction performance, and anti settling performance. High oil absorption calcium powder can eliminate the need for additional extinction agents in matte coatings.

Selection and Application Points

1. Latex paint and putty for interior and exterior walls: 1250-2000 mesh heavy calcium, filled with 15% -35%;
2. Wood and automotive paint: choose ultra-fine light calcium; MS sealant and silicone adhesive specific nano calcium can provide excellent thixotropy;
3. Offset printing ink: choose low oil absorption heavy calcium; UV ink requires transparent nano calcium to ensure printing transparency and glossiness.

Field 5: Building Materials (Putty, Cement, Artificial Stone, Ceramic Tiles)

Core Function

1. Play a filling and leveling function in putty and dry powder mortar, improve polishing and adhesion, while reducing powder costs;
2. Used for concrete and artificial stone, it can improve compactness and compressive strength, and reduce cement consumption;
3. It plays a role in regulating the shrinkage during firing in the ceramic tile body, improving the flatness of the body, and reducing the defect rate during firing.

Selection and Application Points

Ordinary heavy calcium with a mesh of 800-1500 is generally used, without strict activation treatment requirements; External wall weather resistant mortar can be combined with a small amount of ultra-fine light calcium to enhance crack resistance.