Cooling liquid for internal combustion engine, and preparation method and application of cooling liquid

Abstract

The invention relates to the technical field of cooling liquid, and discloses a cooling liquid for an internal combustion engine, and a preparation method and application thereof. The cooling liquid contains organic acid, inorganic salt, a copper sterilization corrosion inhibitor, a dispersing agent and water, wherein the organic acid is composed of benzoic acid, undecanedioic acid, sebacic acid and p-nitrobenzoic acid; and on the basis of the total weight of the cooling liquid, the content of the organic acid is 1-8.5 wt%, the content of the inorganic salt is 0.2-1.5 wt%, the content of the copper sterilization corrosion inhibitor is 0.07-1.2 wt%, the content of the dispersing agent is 0.02-0.2 wt%, and the content of the water is 88.6-98.71 wt%. The cooling liquid can meet the technical requirements of a motor vehicle engine cooling liquid concentrated solution and a direct use type cooling liquid diluent specified in the GB29743 standard.

Description

technical field

[0001] The invention relates to the technical field of cooling liquid, in particular to a cooling liquid for an internal combustion engine and a preparation method and application thereof. Background technique

[0002] The coolant for internal combustion engines is a liquid with heat transfer performance. In summer, the formula technology of deionized water plus anti-corrosion additives can be used for anti-corrosion. Anti-corrosion and anti-icing technology, and make the coolant still have good fluidity and thermal conductivity at low temperatures, which can take away a large amount of heat generated by the engine during operation, and prevent boiling, Anti-corrosion, anti-scaling, anti-freezing, anti-evaporation loss and other advantages.

[0003] The Ministry of Railways TB / T 1750-2006 stipulates the standard specification for additives for internal combustion engine coolant, and clarifies the scope of application of silicates, nitrites, borax and benzotr...

Examples

preparation example Construction

[0037] The second aspect of the present invention provides a method for preparing the aforementioned cooling liquid, wherein the method includes:

[0038] (1) Water, inorganic salt and copper bactericidal corrosion inhibitor are carried out the first mixing to obtain the first mixture;

[0039] (2) The first mixture is sequentially contacted with benzoic acid, sebacic acid, p-nitrobenzoic acid and undecanedioic acid to obtain a second mixture;

[0040] (3) The second mixture is mixed with the dispersant for the third time to obtain a cooling liquid.

[0041] According to the present invention, in step (1), water, inorganic salt and copper bactericidal corrosion inhibitor can be dissolved in glycol, and the first mixture formed is a transparent solution. In addition, in step (1), the pH value of the first mixture is above 8, preferably 8.0-8.5, within this pH range, it has a relatively good protective effect on various metals, and the pH value is too high , It is easy to caus...

Embodiment 1

[0053] This example is used to illustrate the coolant for an internal combustion engine of the present invention.

[0054] Prepare 1000kg summer internal combustion engine coolant:

[0055] Pour 900kg of deionized water into the reaction kettle, then add 1kg of weighed sodium molybdate, 3.5kg of sodium nitrite, 0.5kg of benzotriazole, 3kg of methylbenzotriazole, 1,2-benzene 0.2 kg of diisothiazoline was stirred and heated to dissolve, and the temperature was controlled at 60° C. for 30 minutes.

[0056] Then add 30kg of benzoic acid, 1.5kg of undecanedibasic acid, 20kg of sebacic acid, and 10kg of p-nitrobenzoic acid. At the same time, add an appropriate amount of alkali potassium hydroxide, dissolve and transparent under stirring conditions, adjust the pH value to 8.5, and keep the temperature Neutralize at 60°C for about 3 hours until a transparent and uniform solution is formed;

[0057] Then add 0.2 kg of hydroxyethylidene diphosphonic acid (HEDP) and 0.5 kg of 2-phospho...

Embodiment 2

[0067] This example is used to illustrate the coolant for an internal combustion engine of the present invention.

[0068] Preparation of 1000kg winter direct-use coolant at -25°C:

[0069] Pour 410kg ethylene glycol and 400kg deionized water into the reactor, then add 2kg of weighed sodium molybdate, 3kg of sodium nitrite, 3kg of benzotriazole, 0.5kg of methylbenzotriazole, 1, 1kg of 2-benzisothiazoline was stirred and heated to dissolve, and the temperature was controlled at 60°C for 30 minutes.

[0070] Add benzoic acid 20kg again, undecanedibasic acid 2.25kg, sebacic acid 16.7kg, p-nitrobenzoic acid 9kg, add appropriate amount of alkali potassium hydroxide simultaneously, mediation pH value is 8 after dissolving transparently under stirring condition, keeps Neutralize for about 2-3 hours at a temperature of 60°C until a transparent and uniform solution is formed;

[0071] Then add 0.5 kg of hydroxyethylidene diphosphonic acid (HEDP) and 0.2 kg of 2-phosphonobutane-1,2,4-tr...

technical field

[0001] The invention relates to the technical field of cooling liquid, in particular to a cooling liquid for an internal combustion engine and a preparation method and application thereof. Background technique

[0002] The coolant for internal combustion engines is a liquid with heat transfer performance. In summer, the formula technology of deionized water plus anti-corrosion additives can be used for anti-corrosion. Anti-corrosion and anti-icing technology, and make the coolant still have good fluidity and thermal conductivity at low temperatures, which can take away a large amount of heat generated by the engine during operation, and prevent boiling, Anti-corrosion, anti-scaling, anti-freezing, anti-evaporation loss and other advantages.

[0003] The Ministry of Railways TB / T 1750-2006 stipulates the standard specification for additives for internal combustion engine coolant, and clarifies the scope of application of silicates, nitrites, borax and benzotr...

Examples

preparation example Construction

[0037] The second aspect of the present invention provides a method for preparing the aforementioned cooling liquid, wherein the method includes:

[0038] (1) Water, inorganic salt and copper bactericidal corrosion inhibitor are carried out the first mixing to obtain the first mixture;

[0039] (2) The first mixture is sequentially contacted with benzoic acid, sebacic acid, p-nitrobenzoic acid and undecanedioic acid to obtain a second mixture;

[0040] (3) The second mixture is mixed with the dispersant for the third time to obtain a cooling liquid.

[0041] According to the present invention, in step (1), water, inorganic salt and copper bactericidal corrosion inhibitor can be dissolved in glycol, and the first mixture formed is a transparent solution. In addition, in step (1), the pH value of the first mixture is above 8, preferably 8.0-8.5, within this pH range, it has a relatively good protective effect on various metals, and the pH value is too high , It is easy to caus...

Embodiment 1

[0053] This example is used to illustrate the coolant for an internal combustion engine of the present invention.

[0054] Prepare 1000kg summer internal combustion engine coolant:

[0055] Pour 900kg of deionized water into the reaction kettle, then add 1kg of weighed sodium molybdate, 3.5kg of sodium nitrite, 0.5kg of benzotriazole, 3kg of methylbenzotriazole, 1,2-benzene 0.2 kg of diisothiazoline was stirred and heated to dissolve, and the temperature was controlled at 60° C. for 30 minutes.

[0056] Then add 30kg of benzoic acid, 1.5kg of undecanedibasic acid, 20kg of sebacic acid, and 10kg of p-nitrobenzoic acid. At the same time, add an appropriate amount of alkali potassium hydroxide, dissolve and transparent under stirring conditions, adjust the pH value to 8.5, and keep the temperature Neutralize at 60°C for about 3 hours until a transparent and uniform solution is formed;

[0057] Then add 0.2 kg of hydroxyethylidene diphosphonic acid (HEDP) and 0.5 kg of 2-phospho...

Embodiment 2

[0067] This example is used to illustrate the coolant for an internal combustion engine of the present invention.

[0068] Preparation of 1000kg winter direct-use coolant at -25°C:

[0069] Pour 410kg ethylene glycol and 400kg deionized water into the reactor, then add 2kg of weighed sodium molybdate, 3kg of sodium nitrite, 3kg of benzotriazole, 0.5kg of methylbenzotriazole, 1, 1kg of 2-benzisothiazoline was stirred and heated to dissolve, and the temperature was controlled at 60°C for 30 minutes.

[0070] Add benzoic acid 20kg again, undecanedibasic acid 2.25kg, sebacic acid 16.7kg, p-nitrobenzoic acid 9kg, add appropriate amount of alkali potassium hydroxide simultaneously, mediation pH value is 8 after dissolving transparently under stirring condition, keeps Neutralize for about 2-3 hours at a temperature of 60°C until a transparent and uniform solution is formed;

[0071] Then add 0.5 kg of hydroxyethylidene diphosphonic acid (HEDP) and 0.2 kg of 2-phosphonobutane-1,2,4-tr...

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