Brake fluid type
1. Castor oil-alcohol type: It is prepared by blending refined castor oil 45%-55% and lower alcohol (ethanol or butanol) 55%-45%. After precipitation, it can obtain clear or transparent liquid with no color or light yellow. That is, alcohol-type automobile brake fluid. Castor oil plus ethanol is alcohol type No. 1, castor oil plus butanol is alcohol type No. 3. The raw material of alcohol type brake fluid is easy to obtain, the synthesis process is simple, and the product has good lubricity; Low boiling point, unstable at low temperature. Alcohol type 1 has ethanol vapor above 45 °C, resulting in gas resistance; castor oil precipitates as milky white gum at -25 °C, and increases with temperature, blocking brake system The brake system is too heavy. In the alcohol type 3 cup test, the brake fluid color is slightly deeper, butanol slightly dissolves the corrosion of the rubber, and white precipitates also precipitate at -28 ° C. The literature introduces the addition of glycerol, but there is still sedimentation and stratification at low temperatures. In the cold winters and hot summers,
2. the synthetic type: with ether, alcohol, ester and other additives into the lubrication, anti-oxidation, anti-rust, anti-rubber swelling and other additives.
3. Mineral oil type: It is made by adding a thickening agent and other additives to the refined light diesel oil fraction.