organic pigments minerals magnetite classification

Classification of various iron minerals magnetite their mineral composition, can be divided into four categories: magnetite, hematite, limonite and siderite. Because of their chemical composition, crystal structure  PVC lubricants and generation of the different geological conditions, iron ore having various different external morphology and physical properties. (A) mineral magnetite iron mainly magnetite, of the formula Fe3O4, in which FeO = 31%, Fe2O3 = 69%, the theoretical iron content of 72.4%. This ore containing TiO2 and V2O5 sometimes complex combination of ore, called magnetite or titanium vanadium titanium magnetite. In natural pure magnetite ore rarely encountered, often due to the oxidation of the surface so that part of magnetite oxidation into semi martite and martite. Martite is called magnetite (Fe3O4) is oxidized to hematite (Fe2O3), magnetite, but it still retains the original shape, so called martite. Ferromagnetic magnetite crystals often into octahedron, a few rhombic dodecahedron. Into dense aggregates often massive, black  chromium oxide color streak iron, semi-metallic luster, the relative density of 4.9 to 5.2, hardness 5.5 to 6, no cleavage, mainly gangue of quartz and silicate. Reducing poor, generally contain harmful impurities higher sulfur and phosphorus. (2) anhydrous hematite hematite iron oxide, of the formula Fe2O3, the theoretical iron content of 70%. This mineral in nature, often forming a huge deposit, the principal ore mined from the burial and, it is industrial production.
Hematite iron content is generally 50% to 60%, sulfur and phosphorus containing harmful impurities less, better reduction than magnetite, therefore, hematite iron is a relatively fine material. Hematite with native, but also wild, renewable hematite after magnetite oxidation after losing magnetism, but still maintains the illusion of a crystalline form of Chrolinated polyethylene  magnetite hematite in martite often contain Some residual magnetite. Sometimes also contains some hematite hematite weathering products, such as limonite (2Fe2O3 · 3H2O). Hematite has a semi-metallic luster, crystalline hardness of 5.5 to 6 persons, earthy hematite low hardness, no cleavage, the relative density of 4.9 to 5.3, only weakly magnetic, silicate gangue.

Some organic pigments reason analysis

More simply refers to the diffusion capacity of the toner , i.e., the ability of its original color intensity of a pigment is mixed with a reference color after another presentation . Other colors are usually white benchmarks to measure their color tinting strength . Coloring power is one of the main properties of the pigment.
Tinting strength pigment strength
The main absorption and reflection of light is determined by the degree of the toner itself , the greater the absorption capacity, the stronger coloring power .
The particle size of the toner dispersion and coloring power of the pigment is related.
In the same color , the color strength of organic pigments are generally stronger than inorganic pigments such as Ching Lin , rose red , crimson , and scarlet , etc. Some colors are too strong tinting strength strong bleeding , poor stability fatal shortcomings.
When multi- color painting as an underlying cause pan- color , it is difficult to be completely covered, so it is best to avoid using these colors, a last resort should be carefully controlled , with the deployment of such a color composite color should be added in small amounts reconcile uniform, and then gradually increase the dosage.
Edit this paragraph light force
Li also called Fast light or light resistance force , to maintain the original color of the pigment is the tolerance in the sunlight in the ultraviolet irradiation , in general inorganic pigments will darken gray hair under the action of  PVC plasticizer light, then fades organic pigments fade , but the total force up to see the light , the superior general of inorganic pigments organic pigments.
Light force is an important indicator of the quality of the pigment identification
Test light force
There are special xenon light tester can simulate sunlight exposure can greatly reduce test time .
Light power level
By light fastness standards are divided into 1-8 .
In general , most organic pigments are not light , the mineral pigment is  Polyethylene wax light , such as the deep red Sin will gradually fade in the light, and yellowish brown , red soil and quality ultramarine was enduring.
In addition , between the pigment must be compatible with each other , and some will be changed because of a chemical reaction after the pigment hue reconcile ; There will penetrate the other colors on the color cover , causing trouble.
Oil paint raw materials used in the production of color lakes rose, violet and pink are all very poor light pigment force should be avoided .
Other categories except red cadmium red and vermilion , we will also have a noticeable fading phenomena such as adding white to dilute .
In addition, the role of the oil , too much oil can cause yellowing of darker hue , these are one pack stabilizer  what we should try to avoid.

Organic pigments green paint identification method

Now paint on the market can be said to be varied, to judge whether it is  Plastic impact modifier truly green paint coatings, we need to pay attention to the following aspects of a country depends on the paint meets the mandatory standards , whether by the China Environmental Labeling certification. Second, we must look at the quality of products qualified inspection report , especially on the VOC content of the inspection report . VOC is volatile hazardous substances referred to when the room reaches a certain concentration VOC content , people will feel headache, nausea , vomiting , fatigue and other symptoms will be severe coma , and will hurt the liver , kidneys and nervous system. National standards , VOC limit of no more than 200 grams per liter , preferably 100 g or less  Calcium stearate per liter of coating , coating environmental health really close to zero . Third, pay attention to the brand at the time of purchase, the best -known large enterprises selected products . Also observe the presence or absence of iron the seams rust, leakage ; logo attention on drums are complete ; imported products depends on whether the Chinese instructions.

Increasing the amount of iron oxide pigment

At present, some new color in the color brick cement brick production process  Chrolinated polyethylene often encounter fade, color varies, appeared brick surface, “frost” and so on, give colored brick, tile manufacturers resulted in the economy, the quality of credit losses on the various causes of these phenomena is the largest consumer of iron oxide pigments and coatings sector is the construction industry. Changes in demand and the rise and fall of these two industries directly controlled consumption situation in the region. In recent years, only for color iron mortar over 7000 tons per year. The amount of iron oxide pigments in the construction industry with the rapid development of the industry is also growing about synthetic iron oxide 40,000 ~ 50,000 tons annual  Metallic stearate consumption. American iron oxide is mainly used in the building materials sector concrete paving blocks (about 15% to 20%) with a large iron red, iron oxide yellow, iron brown, iron black colored concrete products manufacturing. For housing construction, iron brown, black iron is the most popular building material in China colorants. In short, the foreign iron consumer market, whether it is an existing market or potential market, the main demand of construction materials are being affected by the color control.

PVC plasticizers is committed to environmental protection PVC plasticizers transition

Although widely used plasticizer for PVC plastic materials is essential, but it is  zinc stearate extremely regrettable that, as has been pointed out phthalate plasticizers potentially carcinogenic, so, for its application, we will have a different sound. If it’s been proven carcinogenic, so a lot of use of plasticizers to PVC production industry will freeze weak, like food packaging materials, medical devices and children’s toys. More importantly, people in contact with these products frequently more important to human health has a great impact. So if their material is so people “talk about their mere mention.” Well, how else would damage their health products to pay for it? And, as people’s awareness of environmental protection, they are increasingly focusing on the green with harmless products. So, if vendors just to reap tangible benefits and profits at the expense of the health of consumers to produce products. So, destined to  Plastic impact modifier be eliminated by the competitive market. Nowadays, conventional PVC plasticizers application has gradually been limited, but insects hundred die hard to be pulled out of it quickly is not possible in conventional PVC plasticizers still exist in some areas of production, and The most important point is that the new type of green PVC plasticizers common characteristics of high cost, which gives the opportunity to drill a conventional plasticizer free. But we all know that new things are bound to overcome the old things, the good news is, now at home and  Metallic stearate abroad has begun production or development of new environmentally friendly pvc plasticizer catalyst; such as sodium bisulfite class, solid super acid, p-toluenesulfonic , inorganic salts, amino acids and heteropoly acids and the like.