DOT6 boric acid ester type braking fluid

Abstract

The invention discloses DOT6 boric acid ester type braking fluid, which is prepared from the following ingredients in percentage by mass: 3 to 16 percent of polyethylene glycol ether, 82 to 95 percentof tris[2-[2-(2-methoxyethoxy)ethoxy]ethyl]orthoborate, 0.05 to 0.15 percent of 6-methyl-2-mercaptobenzothiazole, 0.05 to 0.15 percent of methylbenzotriazole, 0.5 to 1.0 percent of N-methylmonoethanolamine, 0.05 to 0.1 percent of antioxidants 1010, 0.04 to 0.2 percent of acrylic acid 2-ethylhexyl acrylate, 0.01 to 0.05 percent of 4,4'-butylidene bis-(6-tertiary butyl metacresol), 0.01 to 0.05 percent of paraben, 0.01 to 0.05 percent of dodecencylsuccinic acid (T746) and 0.5 to 1.0 percent of alkalinity regulators. The tris[2-[2-(2-methoxyethoxy)ethoxy]ethyl]orthoborate obtained through optimizing the esterification process can effectively solve the problem of high dry and wet boiling point requirements of DOT6; meanwhile, the excellent low-temperature driving performance is realized; thebraking is more sensitive.

Description

technical field [0001] The invention relates to brake fluid technology of an automobile braking system, in particular to DOT6 borate type brake fluid suitable for ABS braking systems. 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 world's mainstream products are DOT4 and DOT5.1 brake fluids with alcohol ether borate as the main raw material and the newly launched DOT6 brake fluid. DOT4 borate synthetic brake fluid has been used worldwide. It has been widely used, and the use of DOT5.1 type brake fluid is less, the main reason is its higher price, while for DOT6 brake fluid, its cost is controllable, and its low temperature performance is better, it can be widely used To meet the requirements of ...

AI Technical Summary

Problems solved by technology

In my country, the current quality level of automobile brake fluid products can meet the requirements of various vehicles, but with the development of the automobile industry and the country's emphasis on safety, the ABS anti-lock braking system is getting more and more popular in the automobile braking system. With more and more applications, it has become a consensus to research and develop brake fluids with high dry and wet boiling points and low low temperature kinematic viscosity. DOT5.1 brake fluid can be well adapted to ABS anti-lock braking system, but its dry The wet boiling point is limited, the production cost is relatively high, and its low temperature performance is limited to a certain extent

In this case, the DOT6 grade brake fluid, which not only has the required dry and wet boiling points, but also has better low-temperature performance, has a broad market, and its production cost is relatively lower than that of DOT5.1 brake fluid. However, the harsh requirements of its low temperature performance have brought certain difficulties to the majority of manufacturers.

[0004] 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 DOT5.1 brake fluid, but there are few reports on the production of DOT6

[0005] 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

[0006] Chinese patent CN 200310112132.5 in 2003, a borate brake fluid and its preparation method, described the production and manufacturing method of borate brake fluid, but this technology uses diethylene glycol as the main raw material for the preparation of borate , so that the brake fluid can only meet the requirements of DOT3 level indicators, and it is also a relatively low-grade formula type

[0007] Chinese patent CN 03111223.4, a 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 , 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. -40℃ low temperature kinematic viscosity reaches 1217mm 2 / s, it cannot meet the requirement of DOT5.1 brake fluid ≤900mm 2 / s technical requirements, let alone meet the requirements of DOT6 ≤750mm 2 The specification of / s requires a

[0008] Invention patent CN201611072418.9 relates to a brake fluid, which includes the following raw materials in mass percentage: 40% to 50% of deionized water, 38% to 55% of antifreeze, 0.5% to 1.5% of stabilizer, and 1.5% of antioxidant % to 3%, preservative 1% to 4%, passivator 2% to 3.5%, the brake fluid of the present invention effectively reduces the temperature rise of the brake fluid, and weakens electrochemical corrosion, effectively meeting the requirements of large Energy-level brakes have strict requirements on the performance of brake fluid, but the brake fluid described in the brake fluid technology of this invention is a mixture of water, alcohol ethers and soda ash, which basically cannot meet the requirements of anti-oxidation and corrosion resistance. In actual use, it is easy to bring huge potential safety hazards. In addition, due to the water content, although the water cooling effect is accelerated, but because the water is easy to volatilize, it is easy to cause braking delay and failure due to instantaneous overheating.

The present invention mainly lies in increasing the steric hindrance of borate, resisting the attack of water molecules, increasing the water resistance, and then mixing it with diluent triethylene glycol methyl ether and other additives to obtain borate brake It effectively solves the problem of easy hydrolysis and poor water resistance of traditional borate brake fluids

The invention of this technology is a relatively complicated borate preparation technology, the production process is long, and the kinematic viscosity of the borate brake fluid produced at -40°C is 1323-1363mm2 / s, and the equilibrium reflux boiling point is 275- 285°C, there is a certain matching problem with the current mainstream ABS braking system. The ABS braking system has great requirements on the low-temperature performance of the brake fluid. With the development of technical indicators, this technological invention can no longer meet the loading needs of mainstream OEMs, and does not have extensive promotion value

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