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Boric ester base fluid for brake fluid and preparation method thereof

A technology of boric acid ester and base liquid, applied in chemical instruments and methods, base materials, organic chemistry, etc., can solve problems such as high reactivity, large volatilization loss, and unclear end point of reaction, so as to speed up the reaction rate and ensure cleanliness The effect of production

Active Publication Date: 2013-08-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low-quality alcohol-based brake fluid widely used in the market is the first generation of brake fluid. The main components are castor oil and ethanol (or butanol). Due to frictional heat and vaporization, high-temperature air resistance is generated, resulting in brake failure and large volatilization loss. Developed countries have eliminated it in the 1940s
The second generation product is alcohol ether type brake fluid, the main component is the adduct of ethylene oxide (or propane) alkane, the high and low temperature performance of this kind of product is better than alcohol type brake fluid, but it is easy to absorb water As a result, the boiling point will drop significantly, and there will be no reliable guarantee for high-temperature performance during use, and there will be low-temperature crystallization, and aggravated corrosion of various metal materials in the braking system.
This method has the following disadvantages: 1) due to the synthesis of boric acid esters with polyvalent acetals as raw materials, the product contains a large amount of residual hydroxyl groups, which is very prone to polycondensation and increases the molecular weight, resulting in a substantial increase in the viscosity of the product, and in the boric acid esters The remaining hydroxyl groups have high reactivity and are prone to transesterification reactions, making the product structure unstable
2) Due to the unclear end point of the reaction, it is difficult for the trihydroxyl group of boric acid to react completely, and the acidic hydroxyl group will remain, causing serious corrosion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] At a pressure of 9.0 x 10 -4 Under the condition of MPa, the pair structure is HO(C 2 h 4 O) n C m h 2m+1 (wherein n=2,3,4,5,6; the polyglycol ether mixture of m=1,2,4 carries out rectification and obtains: 100~140 ℃ cut (middle cut), main structure n=2, 3, m=1, 2, 4; 140-240°C fraction (rear fraction), main structure n=4, 5, 6; m=1, 2, 4.

[0020] The weight ratio of middle distillate obtained by boric acid and rectification and rear distillate is that the reaction raw materials of the ratio of 1: 7: 4 are added to the reactor with devices such as stirring, condensation, reflux, and the pressure is 4.5 × 10 -2 Under the low vacuum reaction condition of MPa, the temperature is raised from 90°C to 145°C for boric acid esterification, the water generated by the reaction is continuously extracted during the reaction, and the temperature is lowered to 100°C after 2 hours of reaction.

[0021] At a pressure of 1.8 x 10 -3 Under the high vacuum reaction condition of MP...

Embodiment 2

[0023] At a pressure of 1.8 x 10 -3 Under the condition of MPa, the pair structure is HO(C 2 h 4 O) n C m h 2m+1 (where n=2,3,4,5,6; m=1,2,4, C m h 2m+1Straight chain or branched chain alkyl) polyglycol ether mixtures are rectified to obtain: 100~140°C fraction (middle fraction), main structure n=2, 3, m=1, 2, 4; 140~ 240°C fraction (rear fraction), main structure n=4,5,6; m=1,2,4.

[0024] The weight ratio of the middle cut obtained by boric acid and rectification and the rear cut is that the reaction raw materials in the ratio of 1: 8: 5 are added to the reaction kettle with devices such as stirring, condensation, and reflux, and the pressure is 5.6 × 10 -2 Under the low vacuum reaction condition of MPa, the temperature is raised from 90°C to 155°C for boric acid esterification, the water generated by the reaction is continuously extracted during the reaction, and the temperature is lowered to 110°C after 3 hours of reaction.

[0025] At a pressure of 3.6 x 10 -3 Un...

Embodiment 3

[0027] At a pressure of 1.5 x 10 -3 Under the condition of MPa, the pair structure is HO(C 2 h 4 O) n C m h 2m+1 (where n=2,3,4,5,6; m=1,2,4, C m h 2m+1 Straight chain or branched chain alkyl) polyglycol ether mixtures are rectified to obtain: 100~140°C fraction (middle fraction), main structure n=2, 3, m=1, 2, 4; 140~ 240°C fraction (rear fraction), main structure n=4,5,6; m=1,2,4.

[0028] The weight ratio of middle distillate obtained by alcohol ether and boric acid and rectification and rear distillate is that the reaction raw materials in the ratio of 1:6:3 are added to the reaction kettle with devices such as stirring, condensation, and reflux, and the pressure is 5.0×10 -2 Under the low vacuum reaction condition of MPa, the temperature is raised from 90°C to 155°C for borate esterification, the water generated by the reaction is continuously extracted during the reaction, and the temperature is lowered to 100°C after 2 hours of reaction.

[0029] At a pressure o...

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Abstract

The invention provides boric ester base fluid for brake fluid and a preparation method thereof. The boric ester base fluid is prepared from oligo ethylene mixed ether and boric acid by a non-isothermal variable pressure dynamic reaction process. In the preparation, the non-isothermal variable pressure dynamic reaction conditions are utilized, so that steric hindrance of three boron-oxygen bonds in the boric acid make the boric acid combined with the refined oligo ethylene ether with different molecular weights stepwise to synthesize the boric ester base fluid with novel structure and composition, which is provided with three different ester groups, and the defects of long time of isothermal esterification reaction and low esterification efficiency are overcome. Meanwhile, trihydroxy benzene of the boric acid can be completely reacted, and cannot cause adverse effect brought by residual acidic hydroxyl. The prepared boric ester base fluid has the dry equilibrium reflux boiling point ofbetween 250 and 290DEG C, the wet equilibrium reflux boiling point of between 180 and 200DEG C, the kinematic viscosity at -40DEG C of 800-1,300mm<2> / s, the kinematic viscosity at 100DEG C of 2.0-2.5mm<2> / s and has good high and low temperature properties.

Description

technical field [0001] The invention belongs to the field of fine chemical industry, and in particular relates to a preparation technology of borate-type base fluid for brake fluid. Background technique [0002] Brake fluid is the working medium for transmitting pressure in the automobile braking system. It is a key supporting product for the automobile to ensure the effective operation of the brake and the safety of the vehicle. It is known as the key automobile chemical safety product in the world. additive composition. The low-quality alcohol-based brake fluid widely used in the market is the first generation of brake fluid. The main components are castor oil and ethanol (or butanol). Due to the heat generated by friction and vaporization, high-temperature air resistance is generated, resulting in brake failure and large volatilization loss. Developed countries have eliminated it in the 1940s. The second generation product is alcohol ether type brake fluid, the main com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M105/78C07F5/04C10N40/08
Inventor 段雪李峰何静
Owner BEIJING UNIV OF CHEM TECH
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