About Talc
The use and synthesis method of DL-mandelic acid
22 6 月, 2021About D-PHENYLALANINE
4 8 月, 2021About Talc
Talc powder is an industrial product. It is a magnesium silicate mineral talc family talc. The main component is hydrous magnesium silicate, which is crushed, treated with hydrochloric acid, washed with water, and dried.
The main component of talc is magnesium silicate containing water and the molecular formula is Mg3[Si4O10](OH)2. Talc belongs to the monoclinic crystal system. The crystals are in the form of pseudo-hexagonal or diamond-shaped flakes, occasionally. Usually into dense block, leaf, radial, fibrous aggregates. Colorless, transparent, or white, but light green, light yellow, light brown, or even light red due to a small number of impurities; pearly luster on the cleavage surface. Hardness 1, specific gravity 2.7～2.8.
The main component of talc is magnesium silicate containing water and the molecular formula is Mg3[Si4O10](OH)2. Talc belongs to the monoclinic crystal system. The crystals are in the form of pseudo-hexagonal or diamond-shaped flakes, occasionally. Usually into dense block, leaf, radial, fibrous aggregates. Colorless, transparent, or white, but light green, light yellow, light brown, or even light red due to a small number of impurities; pearly luster on the cleavage surface. Hardness 1, specific gravity 2.7～2.8.
Talc powder has excellent physical and chemical properties such as lubricity, fire resistance, acid resistance, insulation, high melting point, chemical inactivity, good hiding power, softness, good gloss, and strong adsorption. Because the crystalline structure of talc is layered Shaped, so it has a tendency to easily split into scales and a special lubricity.
Application of talcum powder
Application in coatings
Talc has good suspension and dispersibility, and low corrosiveness. In coatings, talc as a filler can play a skeleton role, reducing manufacturing costs and increasing the hardness of the paint film. It also has the characteristics of improving the stability of the product shape, increasing the tensile strength, shear strength, and pressure strength, reducing deformation, elongation, thermal expansion coefficient, high whiteness, and uniform particle size dispersion. The talc powder with a flaky particle structure can make the coating film have high water resistance and impermeability of enamel. The talc powder with a fibrous particle structure can improve the rheology and leveling properties of the coating, and at the same time, it can improve the Weather resistance of the coating.
Talc is mainly used in primers and intermediate coatings. Many products, flash baking primers, and paints for transportation vehicles are preferred to use talc. The primer for steel structure can use talc powder in whole or in part to improve the precipitation of the coating, the mechanical force of the coating film, and the recoatability.
Application in plastics
Inorganic fillers play an important role in plastic modification and become an indispensable modifier. The white talcum powder with a flake structure is an effective reinforcing material in plastics. It can endow plastics with higher rigidity, creep resistance, and better solid gloss regardless of normal temperature and high temperature. The addition of talc can change various properties of plastics, such as molding shrinkage, surface hardness, flexural modulus, tensile strength, impact strength, thermal deformation temperature, molding process, and product dimensional stability. Adding talc powder to polyethylene and polypropylene plastics can effectively improve the surface hardness and surface scratch-resistance of the products. It is well known that the price of talcum powder is 10%-20% of plastics, so the application of talcum powder to plastics not only improves performance but also effectively reduces the cost of materials and improves the economic benefits of enterprises.
Inorganic fillers play an important role in plastic modification and become an indispensable modifier. The white talcum powder with a flake structure is an effective reinforcing material in plastics. It can endow plastics with higher rigidity, creep resistance, and better solid gloss regardless of normal temperature and high temperature. The addition of talc can change various properties of plastics, such as molding shrinkage, surface hardness, flexural modulus, tensile strength, impact strength, thermal deformation temperature, molding process, and product dimensional stability. Adding talc powder to polyethylene and polypropylene plastics can effectively improve the surface hardness and surface scratch-resistance of the products. It is well known that the price of talcum powder is 10%-20% of plastics, so the application of talcum powder to plastics not only improves performance but also effectively reduces the cost of materials and improves the economic benefits of enterprises.
Application in papermaking
Talc has unique properties such as layered structure, softness, and hydrophobicity. It has significant advantages when applied to the paper industry：
1: Helps increase the retention of fillers and improve the opacity, smoothness, and printability of the paper, giving the paper higher ink absorption.
2: Chemical properties are stable, not only suitable for papermaking under acidic conditions, but also for papermaking under neutral conditions with calcium carbonate.
3: Its surface is hydrophobic (lipophilic), and organic matter is easily adsorbed on its layered surface. The addition of talc reduces the consumption of dyes and effectively saves costs. In addition, its lipophilicity makes it useful for resins and glues. Adhesive inhibitor and waste paper deinking agent.
4: It can be well combined with a sizing agent to improve the retention of the sizing agent, and can reduce the absorption of the paper, and prevent the printing ink from penetrating the paper.
5: Talc powder has a low friction factor, it can make the surface of the coating smooth and soft, can reduce the breakage of the coating, and reduce the printing pressure.
6: As a coating pigment with a high aspect ratio, talc has excellent fiber coverage and good printing effect, and can also improve the quality of gravure printing.
7: Talc powder has special lubricity, and the coated paper made from it can obtain a high finishing degree on the calendar and can reduce the amount of lubricant in the coating.
Talc has unique properties such as layered structure, softness, and hydrophobicity. It has significant advantages when applied to the paper industry：
1: Helps increase the retention of fillers and improve the opacity, smoothness, and printability of the paper, giving the paper higher ink absorption.
2: Chemical properties are stable, not only suitable for papermaking under acidic conditions, but also for papermaking under neutral conditions with calcium carbonate.
3: Its surface is hydrophobic (lipophilic), and organic matter is easily adsorbed on its layered surface. The addition of talc reduces the consumption of dyes and effectively saves costs. In addition, its lipophilicity makes it useful for resins and glues. Adhesive inhibitor and waste paper deinking agent.
4: It can be well combined with a sizing agent to improve the retention of the sizing agent, and can reduce the absorption of the paper, and prevent the printing ink from penetrating the paper.
5: Talc powder has a low friction factor, it can make the surface of the coating smooth and soft, can reduce the breakage of the coating, and reduce the printing pressure.
6: As a coating pigment with a high aspect ratio, talc has excellent fiber coverage and good printing effect, and can also improve the quality of gravure printing.
7: Talc powder has special lubricity, and the coated paper made from it can obtain a high finishing degree on the calendar and can reduce the amount of lubricant in the coating.
Food application
Edible talcum powder is used as an additive in the medicine and food industries. It has the characteristics of non-toxic, tasteless, soft taste, and strong smoothness, so it can be eaten, but excessive use or long-term consumption can cause cancer.
Edible talcum powder is used as an additive in the medicine and food industries. It has the characteristics of non-toxic, tasteless, soft taste, and strong smoothness, so it can be eaten, but excessive use or long-term consumption can cause cancer.
