After paper is soaked in paraffin, it can be made into various kinds of wax paper with good waterproof performance, which can be used in food, medicine and other packaging, metal rust prevention, printing and other industries. After adding paraffin into cotton yarn, textiles can be soft, smooth and elastic; Paraffin wax can also be made into detergent, emulsifier, dispersant, plasticizer, grease and so on.
Fully refined paraffin and semi-refined paraffin are widely used, mainly used as components and packaging materials for food, oral medicine and some commodities (such as wax paper, crayons, candles and carbon paper), as coating materials for baking containers, for keeping fruits fresh, insulating electrical components, and improving the aging resistance and flexibility of rubber. It can also be used for oxidation to produce synthetic fatty acids.
Paraffin wax, as a latent heat storage material, has the advantages of large latent heat of phase change, small volume change of solid-liquid phase change, good thermal stability, no supercooling and low price. With the development of aviation, aerospace, microelectronics and optoelectronics technology, it is often required that a large amount of heat generated by high-power components can only be dissipated in a limited heat dissipation area and in a very short time.
Compared with high melting point phase change materials, low melting point phase change materials can quickly reach the melting point, make full use of latent heat to achieve temperature control, and have relatively short thermal response time, which makes them widely used in high-tech system fields such as aviation, aerospace, microelectronics, and residential energy conservation.
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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, the oil content also has a great influence on the melting point of paraffin. The more oil in paraffin wax, the lower its melting point.
1, oil content
Oil content refers to the content of low melting point hydrocarbons in paraffin. Too high oil content will affect the chromaticity and storage stability of paraffin, and also reduce its hardness. Therefore, the oily wax paste extracted from vacuum fraction needs to be deoiled by sweating method or solvent method to reduce its oil content. However, most paraffin products need to contain a small amount of oil, which is beneficial to improve the gloss and demoulding performance of the products.
2. Stability
Paraffin products are in hot melt state for a long time during molding or coating, and contact with air. If the stability is not good, it is easy to oxidize, deteriorate, turn black, and even have an odor. In addition, paraffin wax will turn yellow when used under light conditions. Therefore, paraffin wax is required to have good thermal stability, oxidation stability and light stability.
The main factors affecting the stability of paraffin wax are trace 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.
3. Thermophysical properties
Paraffin wax has high latent heat of phase change, almost no supercooling phenomenon, low vapor pressure when melting, difficult chemical reaction, good chemical stability, little change in phase change temperature and latent heat after multiple endothermic and exothermic reactions, self-nucleation, no phase separation and corrosiveness.
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