The main component of Haicheng talc is talc containing magnesium silicate, and its molecular formula is Mg3 [Si4O10] (OH) 2. Talc is a monoclinic system. The crystals are pseudo-hexagonal or diamond-shaped flakes, occasionally. It usually forms dense aggregates, leaf-like, radial, and fibrous aggregates. It is colorless and transparent or white, but appears light green, light yellow, light brown, or even light red due to a small amount of impurities; the cleavage surface is pearly luster. Hardness 1, specific gravity 2.7 ~ 2.8.

Application in coatings

Talcum powder has good suspending and dispersing properties, and has low corrosiveness. In coatings, talc as a filler can play a skeleton role, reducing the manufacturing cost and increasing the hardness of the paint film. It also has the characteristics of improving product shape stability, increasing tensile strength, shear strength, compressive strength, reducing deformation, elongation, thermal expansion coefficient, high whiteness, and strong uniform particle size dispersion. The talc powder with flaky particle structure can make the coating film have high water resistance and impermeability of enamel paint. The talc powder with fibrous particle structure can improve the rheology and leveling of the coating, and at the same time it can improve Weatherability of coatings.

Talcum powder is mainly used in primers and intermediate coatings. Talc powder is preferred for many products and flash drying primers and paints for transportation. The primer for steel structures can be used in whole or in part with talc to improve the precipitation of the coating, the mechanical force of the coating film, and the recoatability.

Applications in plastics

Inorganic fillers play an important role in the modification of plastics and become an indispensable modifier. White talc with a thin sheet structure is an effective reinforcing material in plastics. It can give plastics higher rigidity, creep resistance and better solid gloss under normal temperature and high temperature. The addition of talcum powder can change the 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 to polyethylene and polypropylene plastics can effectively improve the surface hardness and scratch resistance of the product. As we all know, the price of talc is 10% ~ 20% of plastic, so applying talc to plastic not only improves the performance, but also effectively reduces the cost of materials and improves the economic efficiency of the enterprise.

Application in papermaking

Talcum powder has the unique properties of layered structure, softness, and hydrophobicity. It has significant advantages when applied to the paper industry: (1) It helps to improve filler retention and improve paper opacity, smoothness, and printability. (2) stable chemical properties, not only suitable for making paper under acidic conditions, but also can be used in combination with calcium carbonate to make paper under neutral conditions; (3) its surface is hydrophobic (Lipophilic), organic substances are easily adsorbed on its layered surface, the addition of talc reduces the consumption of dyes, effectively saves costs, and the lipophilicity makes it useful as a resin, adhesive inhibitor and waste Paper deinking agent; (4) can be combined with sizing agent to improve sizing agent retention, and can reduce the absorption of paper pages, prevent printing ink from penetrating the paper pages; (5) talc has a lower friction factor It can make the surface of the coating smooth and compliant, which 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 effects. Can improve the quality of gravure printing; (7 ) Talcum powder has special lubricity. The coated paper made from it can obtain high finishing on the calender and reduce the amount of lubricant in the coating.