Higher ester type brake fluid

Abstract

The invention discloses a higher ester type brake fluid, which comprises the following components in percent by mass: 5-7.0% of polyethylene glycol monomethyl ether, 0.5-4.0% of trihydroxyl polyoxypropylene, 50-78.0% of triethylene glycol boric acid ester, 0.2-1.0% of methyl benzotriazole, 0.3-1.5% of N-phenyl morpholine, 0.5-2.0% of 2,2-di(4-hydroxyl phenyl) propane, 0.04-2.1% of sulfo-dipropionic acid bidodecanol ester, 0.1-1.1% of 4,4'-butylidene bi(6-tert-butyl m-cresol), 0.5-2.1% of 2,2'-(cyclohexyl imino) diethanol and the balance of alkalinity regulator. The invention has the advantages of high drying and wetting boiling point and great low temperature kinematic viscosity, meets the requirement on durable metal corrosion experiment of 600 hours, satisfies and exceeds the requirement of GB12981-2003, is water insensitive and has good corrosion resisting effect in application of alcohol ether prescription.

Description

technical field [0001] The invention relates to a brake fluid technology for an automobile brake system, in particular to a high-grade ester brake fluid. Background technique [0002] Since the 1970s, a new generation of synthetic brake fluid with higher dry and wet boiling points, lower low-temperature kinematic viscosity and low water sensitivity has become a research hotspot in various countries. Subsequently, automobile brake fluids have been widely developed. At present, the mainstream products in the world are DOT4 and DOT5.1 brake fluids with alcohol ether borate as the main raw material. DOT4 borate synthetic brake fluid has been widely used in the world. The use of DOT5.1 type brake fluid is less, the main reason is its higher price, but with the vigorous development of the automobile industry, the higher requirements for the safety performance of automobiles will definitely promote DOT5.1 Brake fluid is widely used, especially in some demanding conditions. [000...

AI Technical Summary

Problems solved by technology

As far as the existing technology is concerned, borate brake fluid technology has become a necessary technology for high-performance borate brake fluid products. In recent years, there have been many patents and literatures published by the state about borate technology There are also some reports and studies on the production technology of super DOT4 and DOT5.1 brake fluid, but these technologies still have defects and cannot be really applied to the loading requirements

In 2002, the Chinese patent CN1355279A put boric anhydride, polyethylene glycol methyl ether, diethylene glycol and additives in one time, reacted for 3-4 hours under 2-3 atmospheric pressure, and cooled and filtered to obtain the finished brake fluid. It is reported that due to the use of diethylene glycol, it is also difficult to obtain super DOT4, DOT5.1 and above advanced brake fluids with high dry and wet boiling points and low low temperature kinematic viscosity

[0004] The Chinese patent CN 200310112132.5 of 2003, a kind of borate brake fluid and its preparation method, describes the production and manufacturing method of borate brake fluid, but this technology uses diethylene glycol as the main raw material for preparing borate, The brake fluid can only meet the requirements of DOT3 level indicators, and it is also a relatively low-end formula type

[0005] Chinese patent CN03111223.4 A kind of motor vehicle brake fluid and its production method discloses a method of producing brake fluid using a polymer mixture produced by diethylene glycol and 1,1-dichloroethane under the action of a catalyst as a raw material method, but the DOT4 brake fluid technical indicators described in this patent can only meet the general standard requirements, and there is still a big gap from the technical indicators of super DOT4 brake fluid and DOT5.1 brake fluid required by some automobile manufacturers.

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