Paraffin is a kind of hydrocarbon mixture extracted from some distillates of petroleum, shale oil or other asphalt mineral oil. Its main component is solid alkanes, odorless and tasteless, and it is white or yellowish translucent solid. Paraffin is amorphous, but it has obvious crystal structure. There is also artificial paraffin.
Paraffin is a kind of petroleum processing products, is a kind of mineral wax, is also a kind of petroleum wax. It is a kind of flaky or needle like crystal obtained from the distillate of crude oil by solvent refining, solvent dewaxing, freezing crystallization and pressing dewaxing. It is used to make higher fatty acids, higher alcohols, matches, candles, waterproof agents, ointments, electrical insulation materials, etc. Paraffin is divided into food grade (food grade and packaging grade, the former is superior) and industrial grade. Food grade is non-toxic and industrial grade is inedible.
Physical properties: paraffin wax, also known as crystalline wax, is usually a white, odorless wax like solid ° C-64 ° It is soluble in non-polar solvents such as gasoline, carbon disulfide, xylene, ether, benzene, chloroform, carbon tetrachloride and naphtha, but insoluble in polar solvents such as water and methanol. Performance indicators: the main performance indicators of paraffin are melting point, oil content and stability
Paraffin is a mixture of hydrocarbons, so it does not have the same strict melting point as pure compounds. The so-called melting point of paraffin refers to the temperature of the first stagnation period on the cooling curve when the paraffin sample is cooled and melted under the specified conditions. All kinds of wax products are required to have good temperature resistance, that is, not to melt or soften at a specific temperature.
According to the difference of using conditions, regions, seasons and environments, commercial paraffin is required to have a series of different melting points. The main factor affecting the melting point of paraffin is the weight of the selected feedstock fraction, and the melting point of paraffin separated from the heavier fraction is higher. In addition, oil content also has a great influence on the melting point of paraffin. The more oil content in paraffin, the lower the melting point.
Oil content refers to the amount of low melting point hydrocarbons in paraffin. If the oil content is too high, the chroma and storage stability of paraffin will be affected, and the hardness of paraffin will be reduced. Therefore, the deoiling of oil-bearing wax from vacuum distillation should be carried out by sweating or solvent method to reduce its oil content. But most of the paraffin products need to contain a small amount of oil, which is beneficial to improve the gloss and demoulding performance of the products.
In the process of molding or coating, paraffin products are in hot melting state for a long time, and contact with air. If the stability is not good, it is easy to oxidize, deteriorate, darken the color, and even give off odor. In addition, the paraffin will turn yellow when it is used under light conditions. Therefore, paraffin should have good thermal stability, oxidation stability and light stability. The main factors affecting the stability of paraffin are the trace amount of non hydrocarbon compounds and polycyclic aromatic hydrocarbons. In order to improve the stability of paraffin, it is necessary to deeply refine paraffin to remove these impurities.
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