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The main performance indexes of paraffin wax are melting point, oil content and stability.
Melting point
paraffin is a mixture of hydrocarbons, so it does not have a strict melting point like pure compounds. The melting point of paraffin wax,
it refers to the temperature of the first stagnation period on the cooling curve when the molten paraffin sample is cooled under the specified conditions.
All kinds of wax products require good temperature resistance for paraffin wax, that is, no melting or softening deformation at a specific temperature.
Commercial paraffin wax is required to have a series of different melting points according to the differences of use conditions, use areas, seasons and use environment.
The main factor affecting the melting point of paraffin is the weight of the selected raw material fraction, and the melting point of paraffin removed from the heavier fraction is higher.
In addition, oil content also has a great influence on the melting point of paraffin. The more oil in paraffin, the lower its melting point.
Oil content
oil content refers to the amount of low melting point hydrocarbons contained in paraffin wax. Excessive oil content will affect the chromaticity and Storage Stability of paraffin wax, and will also reduce its hardness.
Therefore, the oil-containing cerate extracted from the vacuum fraction also needs to be deoiled by sweating or solvent method to reduce its oil content.
However, most paraffin products need to contain a small amount of oil, which is beneficial to improving the gloss and demoulding performance of products.
Stability
paraffin products in the modeling or coating process, it is in hot melt state for a long time and is in contact with air. If the stability is not good, it is easy to oxidize and deteriorate, the color becomes darker, and even gives off a bad smell.
In addition, paraffin wax will also turn yellow when used under light conditions. Therefore, paraffin wax is required to have good thermal stability, oxidation stability stability and light stability.
The main factors affecting the stability of paraffin are the trace non-hydrocarbon compounds and condensed aromatic hydrocarbons contained in paraffin. In order to improve the stability of paraffin, it is necessary to deeply refine paraffin to remove these impurities.
