Oxidation resistance is another critical performance characteristic of thermal conductive fluids. In open systems or systems with expansion tanks that do not use nitrogen to seal, the interface where the oil comes into contact with air will undergo oxidation reactions. Generally, when the temperature exceeds 60°C, contact with air causes oxidation in the oil, leading to the gradual formation of varnish and sludge, which adhere to the surfaces of heaters and pipelines, resulting in carbon buildup. Additionally, the acidic substances produced by the oxidation reaction can corrode equipment, causing leaks. The L-Q series thermal conductive fluids are formulated with high-quality base oils and high-temperature antioxidants and anti-scaling additives, which can inhibit the rate of formation and deposition of oil sludge, maintaining excellent heat transfer efficiency in the system.
Low-melting thermal oils of biphenyl and diphenyl ether type consist of 26.5% biphenyl and 73.5% diphenyl ether. Their melting point is 12°C. Dowtherm, the earliest synthetic aromatic thermal oil used globally, boasts excellent thermal stability and high operating temperatures up to 400°C. These products have good heat resistance in organic thermal carriers due to the absence of alkyl side chains connected to the benzene ring. The low freezing point (12.3°C) and low melting point make them cost-effective for use at boiling temperatures between 256°C to 258°C at room temperature. This is due to the high melting points of both substances (biphenyl <71°C, diphenyl ether <28°C). During the low-melting evaporation process, there is no concentration of any component, and the liquid properties remain unchanged. However, prolonged use at high temperatures (350°C) can produce phenolic substances in the diphenyl ether, which have low corrosiveness and can cause corrosion to carbon steel and other materials when in contact with water.
Alkylbenzene-type (benzene ring-type) thermal oil is a compound with benzene rings attached to alkyl side chains, belonging to the products of short alkyl side chains (including methyl, ethyl, isopropyl) combined with benzene rings. Its boiling point ranges from 170 to 180°C, and its freezing point is below -80°C, making it suitable for use as an antifreeze. The characteristic of this product is that it is unlikely to precipitate within its applicable range, with isopropyl side chain compounds being particularly excellent.
Alkyl naphthalene thermal oils are compounds with alkyl side chains attached to a benzene ring. The attached side chains typically include methyl, dimethyl, isopropyl, etc., and the type and quantity of these side chains determine the properties of the compound. Alkyl naphthalene with a side chain directly linked to methyl is used in gas phase heating systems within the range of 240~280°C.
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