Engine coolant

A technology of engine coolant and sodium tetraborate, which is applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve problems such as anti-corrosion protection of magnesium alloy engines, and achieve the goal of inhibiting gel precipitation and ensuring anti-corrosion performance Effect

Active Publication Date: 2010-01-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of automobile manufacturing technology and the advent of magnesium alloy engines, the existing coolants have not considered the corrosion protection of magnesium alloy engines

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The formula of this embodiment: ethylene glycol 100kg, deionized water 90kg, sodium benzoate 1.3kg, sodium tetraborate decahydrate 1.2kg, sodium nitrate 0.1kg, terephthalic acid 0.7kg, sodium metasilicate pentahydrate 0.3kg, Silicate stabilizer (aqueous solution containing silicon hydroxyalkyl phosphate) 0.04kg, methyl benzotriazole 0.2kg, sodium hydroxide 0.2kg, defoamer (PE6400) 0.02kg, rhodamine B 0.01kg.

[0025] The blending process of the cooling liquid of the present invention is: according to the above weight, first mix deionized water and ethylene glycol at room temperature, then add sodium benzoate, sodium tetraborate, sodium nitrate, phthalic acid, sodium hydroxide, triazole, After all dissolved, add silicate stabilizer, stir evenly, then add sodium silicate, continue stirring to make it fully dissolved, finally add defoamer and dyeing agent, stir evenly, filter to get the finished product.

Embodiment 2

[0027] The formula of this embodiment: ethylene glycol 100kg, deionized water 60kg, sodium benzoate 1.0kg, sodium tetraborate decahydrate 1.0kg, sodium nitrate 0.5kg, phthalic acid 0.9kg, sodium metasilicate pentahydrate 0.4kg, Silicate stabilizer 0.03kg, sodium salt of methyl benzotriazole 0.1kg, sodium hydroxide 0.35kg, defoamer 0.03kg, rhodamine B 0.02kg. The blending process is the same as in Example 1.

Embodiment 3

[0029] The formula of the present embodiment: ethylene glycol 100kg, deionized water 160kg, sodium benzoate 1.6kg, sodium tetraborate pentahydrate 1.4kg, sodium nitrate 0.2kg, terephthalic acid 0.5kg, sodium metasilicate nonahydrate 0.5kg, Silicate stabilizer 0.05kg, benzotriazole 0.3kg, sodium hydroxide 0.3kg, defoamer (PE6400) 0.04kg, rhodamine B 0.015kg. The blending process is the same as in Example 1.

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Abstract

The invention relates to an engine coolant, which comprises the following compositions in portion by weight: 100 portions of glycol, 60 to 160 portions of deionized water, 1.0 to 1.6 portion of sodium benzoate, 1.0 to 1.4 portion of sodium tetraborate, 0.1 to 0.5 portion of sodium nitrate, 0.5 to 0.9 portion of phthalic acid, 0.3 to 0.6 portion of sodium silicate, 0.03 to 0.06 portion of silicate stabilizer, 0.3 to 0.4 portion of sodium hydroxide, 0.1 to 0.3 portion of pyrrodiazole, 0.01 to 0.06 portion of defoaming agent and 0.005 to 0.02 portion of coloring agent; the engine coolant is characterized in that: the coolant does not contain molybdate, amine, nitrite, phosphate and other substances which are harmful to the environment and human body and has excellent anticorrosive and protective function on red copper, brass, steel, cast iron, soldering tin, cast aluminum and other metals of a cooling system and magnesium alloy adopted in an engine; and the coolant has strong anti-hard water capacity and low cost, meets the requirement of SH/T0521-1999 standard and is applicable to industrialized production.

Description

technical field [0001] The invention relates to an automobile engine coolant. Background technique [0002] Coolant is mainly used in the cooling system of automobile engine, which has the functions of cooling, antifreezing, anti-scaling, anti-corrosion, and anti-boiling. The coolant is mainly composed of antifreeze, water, corrosion inhibitor, defoamer, dyeing agent and so on. The key technology of the coolant is the reasonable intermixing of additives such as various corrosion inhibitors and defoamers. The overall performance of existing cooling liquid products is still not ideal. For example, phosphate is used as a corrosion inhibitor in Chinese patent CN 1297623C. Phosphate has poor resistance to hard water, and easily forms scale, which reduces its anti-corrosion performance. The corrosion inhibitor sodium nitrite used in the cooling liquid in patent CN 1492022A has carcinogenic effect on human body. The coolant given in patent CN 1297624C uses sodium metasilicate as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/20
Inventor 包华辉姚忠才刘功德刘庆国朱天一张辉
Owner PETROCHINA CO LTD
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