Engine antifreezing solution

A technology of antifreeze and engine, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve problems such as poor stability, cooling system failure, poor stability, etc.

Active Publication Date: 2010-04-07
SHAANXI DADI IND CO LTD OF CHINA NAT NUCLEAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently widely used engine antifreeze has good anti-corrosion performance and low price, but its stability is not good
The main reason is that this kind of antifreeze uses silicate as a preservative and borax as a pH buffer. Corrosion performance is reduced, and the gel is easy to block the engine pipe and radiator during use, reducing the heat transfer effect and causing the cooling system to fail
At the same time, the antifreeze formula does not want to contain amines, nitrates, phosphates and other substances harmful to the environment and the human body, and the use of conventional inorganic antifreeze is limited
[0003] In order to solve this problem, foreign countries have begun to use all-organic engine antifreeze, but the use of all-organic engine antifreeze is limited due to the high market cost, and its application is limited to a small number of high-end cars

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Add 400kg of ethylene glycol into the reaction kettle, start stirring, add 1.5kg of benzotriazole under stirring, and fully stir to dissolve. Then 500kg of deionized water was slowly added into the reaction kettle under stirring, and then 1.2kg of sodium molybdate, 12kg of sodium benzoate, 0.4kg of hydrolyzed polymaleic anhydride, and 1.8kg of sodium 2-mercaptobenzothiazole were added in sequence, and stirred to dissolve. Then 14kg of sodium hydroxide, 8kg of isooctanoic acid, and 16.8kg of sebacic acid were simultaneously charged into the reaction kettle, stirred and dissolved transparently. Finally, use the remaining sodium hydroxide to adjust the pH to 8.5-10, mix the defoamer and dye with the remaining amount of deionized water, and add it to the reaction kettle.

[0057] The main indicators in this example are as follows:

[0058]

Embodiment 2

[0060] Add 600kg of ethylene glycol into the reaction kettle, start stirring, add 2.8kg of benzotriazole under stirring, and fully stir to dissolve. Then 300kg of deionized water was slowly added into the reactor under stirring, and then 2kg of sodium molybdate, 24kg of sodium benzoate, 1.6kg of hydrolyzed polymaleic anhydride, and 3kg of sodium 2-mercaptobenzothiazole were added in sequence, and stirred to dissolve. Then 20kg of sodium hydroxide, 11kg of isooctanoic acid, and 28.5kg of sebacic acid were simultaneously charged into the reaction kettle, stirred and dissolved transparently. Finally, use the remaining sodium hydroxide to adjust the pH to 8.5-10, mix the defoamer and dye with the remaining amount of deionized water, and add it to the reaction kettle.

[0061] The main indicators in this example are as follows:

[0062]

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PUM

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Abstract

The invention relates to an engine antifreezing solution which is prepared by mixing the following components to react: glycol, sodium molybdate, sodium hydroxide, isooctanoic acid, sebacic acid, sodium benzoate, benzotriazole, sodium 2-mercaptobenzothiazole, dye and deionized water. The invention adopts a new formula which uses organic matter as main component and inorganic matter as auxiliary component to reach the aim of controlled release on the basis of conventional inorganic and all-organic engine antifreezing solution technologies, wherein the organic acid uses the combination of monoacid and binary acid. The invention does not contain sodium borate and silicate so as to avoid the defect that precipitate is easy to generate due to the existence of sodium borate and silicate in glycol series antifreezing solution and the antifreezing solution is unstable; and the engine antifreezing solution of the invention does not contain amine, nitrate, phosphate and other substances which are harmful to the environment and human body. The researched antifreezing solution has good performances of stability, freeze-proofing, boil-proofing, corrosion-proofing and scale prevention through the cooperative interaction of components so as to perform multi-level anticorrosion protection for the cooling system of the vehicle.

Description

1. Technical field [0001] The invention relates to a low-temperature-resistant engine antifreeze fluid for comprehensive multi-layer protection of an engine cooling system, which belongs to the technical field of chemical compositions. 2. Background technology [0002] Engine antifreeze is the cooling medium of automobile water-cooled engines, which can effectively prevent scaling of the cooling system and corrosion of metal parts, so that the engine can run normally. The engine antifreeze widely used at present has good anti-corrosion performance and low price, but its stability is not good. The main reason is that this antifreeze uses silicate as a preservative and borax as a pH buffer. After a period of storage and use, it is easy to form a gel-like precipitate and precipitate, and the stability becomes poor. Corrosion performance is reduced, and the gel is easy to block the engine pipes and radiators during use, reducing the heat transfer effect and causing cooling syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/20
Inventor 蔡金芳王强史永亮
Owner SHAANXI DADI IND CO LTD OF CHINA NAT NUCLEAR
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