The Development Of Environmentally Friendly Automotive Antifreeze

Engine antifreeze fluid is indispensable coolant in engine cooling system. With the technical development of automobile engine and exaltation of the environmental protection consciousness, the requirement of environmental protection type antifreeze fluid is increasing progressively year by year. Antifreeze fluids still take inorganic salt inhibitor as the principal thing at present in our country. Most corrosion-inhibiting formulations contain cheap inorganic salt inhibitors, such as nitrite, amine, borate ect which are or will be eliminated at abroad. The cheap inhibitors are harmful to environment and human body or disadvantageous to the protection of aluminum. They can't meet the need of the modern automobile development. According to the development direction and Chinese basic condition of antifreeze fluid, the research on environmental protection type antifreeze fluid that possesses excellent property and reasonable price is of economic and social benefit.The development of engine's construction material, basic function of engine antifreeze fluid, the outline of development in Chinese and foreign engine antifreeze fluid, and its research are introduced. This research is conducted the following works:1, Through comparing parameters of Chinese and foreign engine antifreeze fluids, SH0521-1999 specification is determined to adopt.2, Physics and chemistry experiments and sieve tests are built up. At the same time, according to the condition of the laboratory, time of " the glass corrosion experiment" is prolonged to 1064h, which can insure that the engine antifreeze fluid pass the Bench Test.3, At first the research takes orthogonal examination, and then organic salt inhibitor and inorganic salt inhibitor are formulated and optimized. A corrosion-inhibiting formulation possessing high performances is screened out.4, Tests of storage stability are engaged, and the formulation is tested.Results show that the product possesses good stability of storage and excellentperformance of corrosion-inhibiting to solder, aluminum, brass, copper, steel and cast iron. Especially, the protection to aluminum is excellent extraordinarily. It meets...