[Yuancheng Plastics] The Ultimate Tool for Plastic Modification—Talc Powder
Release time:
2021-08-18 14:07
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Fillers are a commonly used additive in plastic processing. Their primary functions are to increase the volume, reduce costs, and improve the utilization rate of the resin.
Since plastics are organic materials and fillers are primarily inorganic, the two are inherently incompatible. When plastics are mixed with fillers, a biphasic structure—consisting of a continuous phase and a dispersed phase—is formed. Consequently, the addition of fillers can alter the properties of the plastic. Generally speaking, plastics containing fillers exhibit greater rigidity and improved dimensional stability; however, their tensile strength and impact resistance tend to decrease. Some fillers can also enhance the wear resistance of plastics, impart flame retardancy to the material, and even provide coloration for plastic products.
Fillers are indispensable in plastic processing and are added in large quantities. Whether it's conventional plastics or new biodegradable plastics, fillers must be incorporated to modify their properties. The market demand is substantial, and many companies specializing in fillers have already gone public.
Advantages of talc powder
Talc powder is refined by grinding talc ore; its main component is hydrated magnesium silicate, with the chemical formula 3MgO•4SiO₂. 2 •H 2 O. Talc powder exhibits excellent chemical stability, is resistant to strong acids and strong bases, and also boasts superior electrical insulation properties and thermal resistance. As an outstanding functional raw material and filler, it can be used in plastics, rubber, and other fields.
Adding talc powder to polymers can enhance their rigidity, improve dimensional stability, prevent high-temperature creep in molded parts, and increase the number of cycles for mold reuse. Modified talc powder can also boost the tensile strength and impact resistance of plastic parts.
The addition of talc powder helps enhance the melt strength of plastic parts and can also serve as a viscosity regulator for the melt.
Talc powder boasts excellent insulating properties and is resistant to acids and alkalis; it is commonly used in the manufacture of acid- and alkali-resistant insulating products made from PVC, PP, PA, and ABS.
Talc powder has a relatively small particle size and can serve as a crystal nucleus, exhibiting a certain nucleation effect. Experiments show that when the addition level of talc powder is 1% or 5%, it can enhance the crystallization rate of PLA; however, when the addition level exceeds 10%, the crystallization rate will decrease.
Talc powder is white or pale yellow in color and has a refractive index similar to that of PVC; it can be used as a filler for light-colored and translucent plastic products.
Classification and Technical Specifications of Talc Powder
Talc is often classified and graded according to its intended use, including grades for plastics, rubber, coatings, papermaking, cosmetics, pharmaceuticals, cables, and ceramics, among others.
The main technical indicators of talc powder include: mesh size, whiteness, and loss on ignition.
Mesh Number: The mesh number refers to the number of openings per unit area on a sieve. The higher the mesh number, the smaller the particle size, and the more complex the required manufacturing process will be. With advances in technology, the mesh number of commercially produced talc powder has increased from 800 mesh to 5,000 mesh. Generally speaking, the smaller the particle size of talc powder, the better its reinforcing effect on plastics. In addition to controlling particle size, it’s also crucial to maintain a narrow particle-size distribution; if the particle-size distribution is too broad, it can negatively affect the reinforcing performance. Similar to calcium carbonate powder, when talc powder particles become very small, they require chemical surface treatment for modification.
Whiteness: The whiter the product, the higher its purity and the better its coloring effect. The whiteness of talc powder ranges from 75% to 95%, and the appropriate grade should be selected based on the requirements of different materials.
Loss on ignition: An indicator of talc powder purity, representing the mass loss of talc powder after impurities have been removed at high temperatures. Impurities such as metallic iron and heavy metals present in talc powder can affect the aging resistance and thermal stability of plastics. Generally, plastic processing is more suitable when using talc powder with a loss on ignition below 6.5%.
Applications of talc powder
Talc powder has a wide range of applications and can be used with the vast majority of plastics and other materials.
Used as a reinforcing and modifying filler in the chemical industry for applications such as rubber, plastics, and paints. Features: Enhances product shape stability, increases tensile strength, shear strength, flexural strength, and compressive strength; reduces deformation, elongation at break, and thermal expansion coefficient; exhibits high whiteness and excellent uniform particle size distribution.
Material with added talc powder
(1) LUPOL GP3200, GP3156F
Applications: Home appliance components, automotive interior parts, motor frame for juicers
(2) LUPOY GN5101RF, GN5151RF
Application: Laptop casing
*For inquiries, please contact Ms. Liu at 13926400876.
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