Performance And Use Of Iron Oxide Pigments
Iron oxide pigments have excellent pigment properties:
1. Has a high degree of chemical stability and physical fastness:
Alkali resistance: for any concentration of alkaloids and other types of alkaline substances, especially in the building commonly used cement, lime mortar and so are very stable, and the cement building components do not occur powder, the appropriate amount does not affect Its strength.
Acid: the general weak acid and dilute acid has a certain resistance to resistance, but can gradually dissolved in strong acid, especially in the case of heating and thicker.
Lightfastness: the same color in the strong sunlight exposure.
Heat resistance: in a certain temperature limit is stable, more than its temperature limit color began to change, with the temperature increases, the degree of change will become increasingly significant, the temperature limit of each species as follows:
Iron oxide yellow more than 170 ℃ gradually discolored red phase
Iron oxide red more than 600 ℃ gradually discolored as crimson
Iron oxide black more than 100 ℃ gradually discolored dark red
Iron oxide brown more than 100 ℃ gradually change color for the red phase
Iron green more than 170 ℃ gradually discolored dark red
Resistance to climate: from the atmosphere of cold and heat, dry and wet weather conditions such as the impact.
Anti-fouling air: in any dirty gas are very stable, such as hydrogen sulfide, carbon oxides, sulfur oxides, hydrogen chloride, nitrogen and other gases.
Water resistance, oil resistance, solvent resistance: insoluble in water, various mineral oils, vegetable oils and ethers, esters, ketones and other organic solvents, and no penetration.
2. There are bright colors and unique colors
Iron oxide pigment color is very clean and pure, and do not use other organic or inorganic pigment plus sets of polish. Although it is not as bright as some organic pigments or other pigments, but the color of iron oxide pigment has a unique style, its soft, quiet tone pleasing, suitable for residential, public places, indoor and outdoor coating brush. Its solemn tones, especially for luxury buildings and magnificent buildings.
3. Excellent economic results
Iron oxide pigments have a high color strength, fine and uniform particle size, to ensure that his use value, coupled with lower prices, to ensure that the user's economic results. The world's production of iron oxide pigment for coloring is estimated at 145 to 1.5 million tons / year. China is a major producer of iron oxide and an important consumer market for iron oxide products in the world. Its production accounts for more than 55% of the world's total, Consumption accounts for more than 40% of the world's total consumption, occupies an important position in the international market. China's iron oxide industry started very fast, in less than 20 years time, to develop into the world's iron oxide production power. The construction industry and the coatings industry are the most important users. Iron oxide is also used in non-coloring areas such as ferrite, magnetic memory materials, chemical catalysts and the like. If all these areas are included, the world's iron oxide requirements will be greater, of which 70% of synthetic iron oxide, natural iron oxide accounted for 30%. China's iron oxide production capacity of the industry in 2014 to reach 800,000 tons / year.