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The ratio of the diameter of the mica powder particles (wafers) to the thickness (diameter-thickness ratio) is 80-120 times, and the thickness of the wafers is only about tens of nanometers to a hundred nanometers.
The unique flake structure is used for flake coatings, which can be used as a physical shield to shield the damage of the paint film from sunlight and ultraviolet rays, thicken the anti-corrosion layer, inhibit the penetration of corrosive media, and reduce the residual stress in the lining.
The application in architectural exterior wall coatings can not only improve the mechanical properties of the coating, but also improve the aging resistance and UV resistance of the coating, prevent cracking and delay pulverization.
At the same time, the pigment particles can easily enter the lattice layer of flake minerals.
Can keep the paint color for a long time without fading com" href="">paint online coatingol.
com .
Mica powder
It is widely known that ultraviolet rays in sunlight are the root cause of paint aging and weakening of functions.
Ultra-fine flake minerals have strong crystal polarization effects and light interference effects of crystal water between layers, which have a strong effect on ultraviolet rays and infrared rays.
The absorption and reflection effect of the light, thereby effectively protecting the coating and pigments in the exterior wall paint.
Hard shell flakes
It is found through experimental research that adding 5-8% of superfine mica powder to exterior wall coatings can increase the aging resistance of exterior wall coatings to more than 750 hours.
Such products have a high coverage rate and ultraviolet absorption function, can form an efficient barrier effect in the paint film, so that the diffusion, penetration and migration of corrosive substances in the paint film become extremely tortuous (shielding and labyrinth effect), The time to penetrate the paint film is extended to 3 times, thereby greatly improving the performance of the anti-corrosion coating.
The flaky fillers form a substantially parallel alignment in the paint film, and the penetration of water and other corrosive substances into the paint film is strongly blocked.
The use of high-quality mica powder is an important means to improve the quality and performance of anti-corrosion coatings and exterior wall coatings.
During the coating process, the mica wafers lie down under the action of surface tension before the paint film is cured, and automatically form a structure that is parallel to each other and the surface of the paint film.
Such layer-by-layer arrangement, the orientation of which is exactly perpendicular to the direction in which corrosive substances penetrate the paint film, constitutes an inert and flexible protective layer against corrosion and solar radiation.
Natural rock slices
Application of mica powder in anticorrosive paint
Due to the scaly structure of mica, it can play a tile-like structure in the anticorrosive paint, which prevents corrosion factors from entering the surface of the metal substrate to the maximum extent, and can also improve the softening point and hardness of the paint film.
skills:
1.
Flake mica with a relatively large diameter is required.
Dry or wet muscovite and synthetic mica are recommended.
Sericite is soft and thin, so it has a smaller diameter after processing into mica powder, which is not suitable for anticorrosive paint Used in.
Phlogopite is relatively hard and has poor dissociation, and the diameter-thickness ratio of the processed mica powder is also relatively poor.
2.
In terms of particle size, mica powder with a particle size between 325 mesh and 1500 mesh is recommended.
3.
4.
Some domestic companies add different amounts of mica powder to the solvent-free heavy-duty anti-corrosion coating system for ship bottom, which greatly improves the water resistance, salt spray resistance and comprehensive mechanical properties of the paint film; mica powder has been widely used in various anti-corrosion and heavy-duty coatings , Is a high-quality functional material.
Application of mica powder in damping coating
In the field of shipbuilding, damping coatings are used to manufacture propellers, transmission components and compartment partitions, which effectively reduce the vibration and noise caused by surface collisions during the meshing process of mechanical parts.
Colorful film
Adding mica filler can effectively expand the damping temperature range.
Flake mica is the most commonly used and most effective filler.
When vibration or noise is radiated, the flake mica powder will move along the vertical direction of vibration and noise transmission, and friction occurs between the emulsion polymer chain, mica powder and other fillers around it, and the mechanical energy is quickly converted into heat energy.
To damping and damping effect.
