Publish Time: 2024-09-10 Origin: Site
Calcium carbonate is a commonly used filler in the production and processing of PVC skirtings, which plays a role in filling and enhancing product performance.
As a commonly used inorganic filler, calcium carbonate can not only effectively reduce the production cost of PVC materials, but also improve the hardness and rigidity of skirtings, and enhance their impact resistance and wear resistance.
In addition, the fineness and uniformity of calcium carbonate particles affect the surface finish and color stability of PVC skirtings. Strict control of these two factors can ensure the appearance quality and service life of the product.
At the same time, calcium carbonate can improve the processing performance of PVC materials, making skirtings easier to extrude and cut, thereby improving production efficiency.
1. Light calcium carbonate
2. Heavy calcium carbonate
Light calcium carbonate is a white powdery inorganic filler produced by chemical precipitation. It is mainly produced by high-temperature calcination of limestone to generate carbon dioxide, which then reacts with slaked lime to form calcium carbonate precipitation.
Compared with heavy calcium carbonate, light calcium carbonate has a smaller particle size and a larger specific surface area, so it has excellent dispersibility and filling properties in industrial applications.
It is widely used in industries such as plastics, rubber, and coatings to improve the strength, glossiness, and wear resistance of materials while reducing production costs.
Heavy calcium carbonate is a white powdery inorganic filler made by directly crushing natural limestone by physical methods.
Heavy calcium carbonate has better wear resistance than light calcium carbonate due to its large particles high density and low oil absorption.
It is commonly used in industries such as plastics, rubber, papermaking, and building materials. As a filler, it can enhance the hardness and stability of the material while reducing production costs.
In addition, heavy calcium carbonate is inexpensive and widely available and has become an important auxiliary material in many industrial productions.
1. Different manufacturing process
Light calcium carbonate is produced by chemical precipitation. Limestone is calcined at high temperatures to produce carbon dioxide, which then reacts with slaked lime to form calcium carbonate precipitation.
Heavy calcium carbonate is produced by mechanical crushing, which is the physical crushing of natural limestone, calcite, and other ores, followed by screening and other processes.
2. Particle size and density vary
Light calcium carbonate has smaller particles, usually around 0.5-3 microns, with a higher specific surface area and lower density.
Heavy calcium carbonate particles are larger, usually 1-20 microns or larger, with higher density and smaller specific surface area.
3. Different oil absorption
Light calcium carbonate has a high oil absorption capacity and is often used in materials with high filling performance requirements due to its large specific surface area.
Heavy calcium carbonate has low oil absorption and is suitable for applications requiring high filling volume and low oil absorption.
4. Different application areas
Light calcium carbonate is widely used in high-end coatings, rubber, plastics, papermaking, and other industries due to its fine particles and excellent dispersibility to improve the gloss, whiteness, and mechanical strength of materials.
Heavy calcium carbonate is mostly used in rubber, plastic, papermaking, building materials, and other fields as a filler to increase the hardness and stability of the product while reducing production costs.
5. Product performance is different
Light calcium carbonate has small particles and good dispersibility, can provide better gloss and more delicate surface effects, and is suitable for products with high requirements on appearance.
Heavy calcium carbonate has large particles and a hard texture. It is mainly used to enhance the structural strength and wear resistance of products and is suitable for occasions with high requirements for mechanical strength.
6. Costs vary
The production process of light calcium carbonate is relatively complex and costly, and is usually used in high value-added products; while the production process of heavy calcium carbonate is simple and cost-effective, and is widely used in bulk industrial products.
Due to the high requirements for the mechanical properties of skirting boards, heavy calcium carbonate is more commonly used. In addition, a small amount of light calcium carbonate is also used in high-end PVC skirting boards to enhance the smoothness and fineness of the product surface.
The main functions of calcium carbonate in PVC skirting board profiles are as follows:
1. Enhance the mechanical properties of skirting boards
PVC skirting board profiles usually need to add calcium carbonate as a filler during the production process, which can enhance the hardness and rigidity of the profiles, making them more durable.
2. Improve processing performance
Adding calcium carbonate can improve the fluidity of PVC during the production process, making the material smoother during extrusion or injection molding, reducing energy consumption and time during the production process, and improving production efficiency.
3. Improve product appearance
During the production process, adding an appropriate amount of calcium carbonate can make the surface of the PVC profile smoother and flatter, thereby improving the appearance quality of the finished product.
4. Improve material stability
Calcium carbonate can improve the dimensional stability of PVC materials and reduce thermal expansion, contraction, or deformation caused by temperature changes.
5. Reduce production costs
In addition, calcium carbonate, as a filler, can reduce the production cost of skirting profiles.
As we all know, PVC materials have poor toughness and are prone to brittle fracture when subjected to external force impact, so they need to be toughened and modified.
For example, using calcium carbonate (light calcium carbonate or heavy calcium carbonate) as a filler in PVC products can reduce production costs on the one hand, and improve the processing performance and use performance of the material on the other hand.
The traditional method is to use elastomer toughening agents to modify PVC, which improves the toughness of the material but sacrifices the original properties of the material such as modulus, hardness, rigidity, and thermal deformation temperature;
Using rigid particles to modify PVC avoids the decline of the above properties and reduces costs.
However, due to the large difference in surface properties between inorganic rigid particles and PVC resin, the toughening effect is affected by many factors such as the processing method, composition, size, morphology, degree of dispersion, and molding conditions of the inorganic rigid particles.
1. Type
2. Particle size
3. Morphology
4. Dispersion effect
5. Modification process
In the building materials industry, calcium carbonate is used as a filler in many PVC products, whether it is PVC U-tubes, PVC profiles, PVC wall panels, PVC skirting profiles, etc. Adding calcium carbonate to PVC products can reduce costs, improve the stability and hardness of PVC materials, and improve its processing performance.
However, there are many types of calcium carbonate on the market, and their quality also has advantages and disadvantages. So how do we judge the quality? Here are some common methods for you.
1. Sedimentation volume test method
The principle of the sedimentation volume test is to make a judgment based on the different sedimentation speeds of particles of different particle sizes and densities in liquid.
The sample is placed in a certain liquid to make a suspension of a certain concentration, and the particles in the suspension settle under the action of gravity or centrifugal force. Calcium carbonate with large particles and high density settles faster and has a small sedimentation volume; calcium carbonate with small particles and low density settles slower and has a large sedimentation volume.
The density of light calcium carbonate is 2.4-2.7g/Cm3; the density of heavy calcium carbonate is 2.7-2.95 g/Cm3.
2. Calcium carbonate color tone detection
Calcium carbonate color tone will directly affect the appearance of white PVC products, easily causing the plastic products to be dull in color and poor in gloss. Therefore, the calcium carbonate color tone detection method can also be used to detect the quality of calcium carbonate.
Calcium carbonate color tone detection is to heat mix PVC, calcium carbonate, and composite stabilizer in a ratio of 100:25:4 to make a dry blend, mix the dry blend through a torque rheometer, stop the test after the material is plasticized and a plasticization peak appears, and observe whether the appearance color of the PVC mixture plasticized material is green, gray or red.
3. Apparent density detection
The apparent density of powder refers to the mass per unit volume of powder in an uncompressed state. Light calcium carbonate powder is a porous particle aggregate, and its apparent density reflects the particle aggregation state and pore state.
The processing performance of calcium carbonate is often related to the particle characteristics of calcium carbonate. Data directly related to the characteristics of calcium carbonate particles, such as particle size distribution, porosity, pore size and pore size distribution, specific surface area, density distribution, and particle morphology, are difficult to detect for companies using light calcium carbonate. The apparent density, which is indirectly related to the characteristics of calcium carbonate particles, is based on the apparent density detection method of polyvinyl chloride resin. The detection equipment is simple and easy to operate, and PVC product manufacturers can detect it relatively easily.
Calcium carbonate plays a very important role in the production of PVC skirtings. Its main function is to enhance the hardness and rigidity of the material, improve its processing performance, and improve the dimensional stability and surface finish of the finished product.
In addition, adding calcium carbonate during the production of PVC skirtings can effectively reduce costs, making its performance more superior and economical.
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