What are the Characteristics of Wet Ground Mica Powder in Plastic?

Mar. 19, 2020

1) Change the optical characteristics of plastics

Mica Powder has the functions of reflecting, radiating infrared and absorbing, and shielding ultraviolet. For example, if high-quality wet mica powder is added to the agricultural film, the mica microchip reflects infrared radiation, which makes it difficult for light energy to escape due to thermal radiation (that is, infrared radiation) after passing through the agricultural film. Thermal insulation effect. In this application, the purity and flake structure of the mica powder is particularly important. The impurities will reduce the enhancement effect of mica powder, affect the transparency, and greatly increase the haze so that the light entering the greenhouse is reduced. At the same time, if the sheet structure is poor, the effect of blocking infrared radiation is poor.

Phlogopite Mica

Phlogopite Mica

Drugs, cosmetics, food and other products need to shield light radiation, especially ultraviolet radiation, to improve the storage performance of the product. Wet Ground Mica Powder with perfect flake structure can be added to their plastic packaging materials to shield light radiation, especially ultraviolet radiation.

Large particle size mica powder filler can improve the gloss of the material (pearlescent effect), and the fine mica powder plays a matting effect.

2) Improve the air tightness of plastics

Wet-processed mica powder has an excellent flaky crystal form, the thickness of microcrystals is measured in nanometers, and the diameter-to-thickness ratio is as high as 80 to 120 times. After adding wet high-purity and high-quality mica powder in plastic, the air tightness will be greatly improved. Such plastics, according to patent documents, can be used to make cola bottles, beer bottles, pharmaceutical packaging bottles, moisture-proof packaging materials, and many similar special plastic packaging materials.

3) Improve the physical and mechanical properties of plastics

Flaky and fibrous fillers disperse the stress on materials, and the mechanism is similar to that of steel bars in concrete. Many reinforcing materials (plastic, rubber, resin, etc.) use anisotropic materials, and the principle is the same. The most typical application is carbon fiber, but carbon fiber is very expensive, coupled with color restrictions, it is difficult to apply. Asbestos is carcinogenic and its applications are strictly restricted. There are many difficulties in manufacturing ultrafine glass fiber (such as 1 micron in diameter, or nanometer), and the price is quite high. Particulate fillers include quartz micropowder, kaolin micropowder, etc., which are present in a large amount in dry process mica powder, like sand and gravel in concrete, which have no such effect. Only after adding large diameter-to-thickness ratio fillers (such as wet mica powder), the tensile strength, impact strength, elastic modulus, other mechanical properties, morphological stability (such as resistance to thermal torsion and fatigue creep) of plastics and resins (Degeneration) and anti-wear properties are significantly improved. There is a lot of research in materials science, and one of the keys is the shape ratio of the filler.

Our company also has Phlogopite Mica on sale, welcome to consult.