A kind of engine coolant and preparation method thereof

A technology of engine coolant and content, applied in the direction of chemical instruments and methods, heat exchange materials, etc., can solve the problems of easy corrosion of engine metal parts, cost and high freezing point, and achieve the effect of improving corrosion inhibition performance and reducing cost

Active Publication Date: 2011-12-21
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the technical problems of engine coolant cost, high freezing point and easy corrosion of engine metal parts existing in the prior art

Method used

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  • A kind of engine coolant and preparation method thereof

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preparation example Construction

[0022] The invention provides a preparation method of the engine coolant, comprising the following steps:

[0023] a. Dissolve carboxylic acid or carboxylate and additives with 1-2 carbon atoms in water, adjust the pH value to be not less than 9, and record it as solution A; the additives contain EDTA chelates of trivalent rare earth elements;

[0024] b. Dissolve the silicate in water to form a silicate solution; add the silicate solution into solution A, stir evenly, and record it as solution B;

[0025] c. filter the solution B, add ethylene glycol to the filtrate, and stir evenly to obtain the engine coolant.

[0026] According to the preparation method provided by the present invention, first dissolve the carboxylic acid or carboxylate with 1-2 carbon atoms and additives in part of the water, so that the pH value is not less than 9, and record it as solution A; in addition, the silicate solution Prepare a silicate solution in the remaining water, and then pour it into A ...

Embodiment 1

[0029] (1) Add 500 parts by weight of deionized water to the container, then add 50 parts by weight of potassium acetate, 0.1 part by weight of EDTA-La, 10 parts by weight of borax, 0.6 parts by weight of sodium molybdate, 1 part by weight of sebacic acid, and sodium benzoate 5 parts by weight, 1 part by weight of sodium nitrate, 1 part by weight of benzotriazole, 2 parts by weight of sodium hydroxide, stirred to dissolve; finally add silicate stabilizer modified siloxane N4144 (molecular formula is CH 3 O(CH 2 CH 3 O) 7.8 C 3 h 6 Si(OCH 3 ) 3 ) 0.3 parts by weight, stirred evenly to obtain solution A1.

[0030] (2) In another container, add 100 parts by weight of deionized water, then add 2 parts by weight of sodium silicate nonahydrate and stir until dissolved to prepare a sodium silicate solution; add the sodium silicate solution to solution A1, stir evenly, and obtain Solution B1.

[0031](3) Filter solution B1, add 327 parts by weight of ethylene glycol, 5 ppm sod...

Embodiment 2

[0042] (1) Add 500 parts by weight of deionized water to the container, then add 187 parts by weight of sodium formate, 0.9 parts by weight of EDTA-Ce, 9.6 parts by weight of borax, 0.3 parts by weight of sodium molybdate, 0.5 parts by weight of sebacic acid, and 6 parts by weight of sodium benzoate Parts by weight, 1 part by weight of sodium nitrate, 0.5 part by weight of benzotriazole, 1.9 parts by weight of sodium hydroxide, stirred until dissolved; finally added silicate stabilizer modified siloxane N4144 (molecular formula CH 3 O(CH 2 CH 3 O) 7.8 C 3 h 6 Si(OCH 3 ) 3 ) 0.3 parts by weight, stirred evenly to obtain solution A2.

[0043] (2) Quantitatively add 100 parts by weight of deionized water in another container, then add 2 parts by weight of sodium silicate nonahydrate and stir until dissolved to prepare a sodium silicate solution; add the sodium silicate solution into solution A2, stir evenly, Solution B2 is obtained.

[0044] (3) Filter solution B2, add 19...

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Abstract

The invention relates to engine cooling liquid, containing water, ethylene glycol, carboxylic acid or carboxylate with the number of carbon atoms being 1-2, silicate and an additive, wherein the additive contains EDTA (ethylene diamine tetraacetic acid) chelate of trivalent rare-earth elements. The invention also provides a preparation method of the engine cooling liquid. In the engine cooling liquid provided by the invention, the ice point is low, and the corrosivity for metal parts of an engine is less.

Description

technical field [0001] The invention relates to an engine coolant and a preparation method thereof. Background technique [0002] Most of the engine coolants used in the market are aqueous solutions of ethylene glycol, and water is used as the main cooling medium to take away the heat during fuel combustion; however, the freezing point of water is relatively high, so ethylene glycol is used to lower the freezing point of the coolant; at the same time In order to ensure that the metal parts of the engine cooling system are not corroded by the coolant during use, various corrosion inhibitors are usually added to the coolant. [0003] Since the high price of ethylene glycol makes the cost of engine cooling expensive, technicians began to seek cooling media that can effectively reduce the freezing point of the coolant without affecting the corrosion inhibition performance. For example, US5104562 discloses a cooling liquid formula containing formates, acetates, urea, or ethylene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/20
Inventor 朱志坚
Owner BYD CO LTD
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