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Yuan Lei's Little Knowledge | Which Coating (IV) Are Different Mineral Powders Suitable

Release time:

2024-01-29 09:34

Non-metallic minerals are mainly used as functional fillers in the coatings industry. The purpose is to reduce the cost of coatings; increase the consistency of latex paint, improve the suspension of pigments in the paint; give coatings functionality and improve their properties, including gloss, hiding Power, flow and homogenization, durability, film thickness, penetration and rheology.

There are many kinds of mineral fillers and their performance varies greatly. Therefore, it is the key for non-metallic mineral powder manufacturers to open the coating market to thoroughly understand the performance and best application of mineral fillers.

 

 

Originally, most effective anti-corrosion pigments were based on chromium and lead salts. Now these two salts will produce toxic underground pollution and environmental concerns.

The characteristics of fillers used in anti-corrosion coatings include low chemical reaction, hydrophilicity, low oil absorption, mainly talc, wollastonite, barite, mica powder and the latest rise of graphene.

(1) Talc and barite

Talc is an important mineral that reduces the water permeability of the paint film, and barite can improve the weather resistance and acid and alkali resistance of the paint in addition to the lowest oil absorption.

(2) Wollastonite

Wollastonite is used to increase the tensile strength of the coating and reduce cracks, especially the wollastonite treated with silane coupling agent, and another important feature is anti-corrosion. For example, wollastonite can be used as an anti-corrosion agent to partially replace expensive zinc phosphorus salt anti-corrosion pigments for water-based epoxy metal primers.

(3) Illite

In the epoxy resin system, illite is a high-quality functional filler. Epoxy resin and amine curing agent after the crosslinking reaction of the coating is alkaline, the alkaline of the ilite powder added to the coating, can promote the full curing reaction of amine and epoxy, plus itself is alkaline, enhance the alkaline coating, the corresponding improve the anti-corrosion performance of the coating, and reduce the production cost.

 

 

(4) Graphene

Graphene is easy to form a dense film in the coating due to its good shielding and large specific surface area, which is of great help to improve the anti-corrosion performance. Studies have shown that CVD-grown graphene can form a protective layer on the surface of copper, aluminum and other metals to prevent metal oxidation and corrosion.

The graphene prepared by redox can be mixed with organic resin to prepare composite coating, which can play the shielding effect of graphene and the excellent adhesion ability of resin, and achieve the purpose of long-term anti-corrosion. Compared with ordinary coating, the graphene coating prepared by redox can reduce the corrosion rate of low alloy steel by 1 order of magnitude.

(5) quasi spherical silicon powder

The quasi-spherical silica powder can be enriched into the structure of the coating in the anti-corrosion powder coating, forming a dense and strong coating film, which plays a role of chemical passivation and physical sealing.

(6) Mica powder

Mica flakes from a wide range of sources, cheap, with excellent insulation, elasticity and flexibility, diameter-thickness ratio, small thermal expansion coefficient, inert in a variety of chemical media, anti-ultraviolet radiation, the coupling agent surface treatment, can replace expensive glass flakes and stainless steel flakes, thereby reducing costs. In addition, the mica flake has 20-1000 mesh specifications, and mica powder of different specifications and grades can be selected to increase the compactness of the paint film and reduce the air permeability of the paint film. For example, the mica flake is used in the preparation of water-based silicone acrylic latex paint, which effectively improves the water resistance and chemical medium corrosion resistance of the paint film.

 

Suitable for, coating, paint, graphite, filler, can, flake, anticorrosive, wollastonite, mineral

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