CN100590170C - Automobile engine cooling liquid and its preparing process - Google Patents

Abstract

A cooling liquid of engine for vehicle and its production are disclosed. It consists of water, glycol and other additives. Copper corrosion inhibitor, thiazodium and alkyl amine benzimidazole. The pHvalue is between 6-11, it has excellent corrosion inhibiting function, less usage and better stability. It has good boiling and freezing resistances and no deposits and scales.

Description

A kind of automobile engine cooling liquid and preparation method

Technical field

The present invention relates to the cooling fluid technology, is a kind of automobile engine cooling liquid and preparation method specifically.

Background technology

At present the cooling fluid that extensively adopts of car engine cooling system is except having good cooling heat dissipation effect, also should have anticorrosion, scale inhibition, function such as antifreeze.Its composition comprises water, frostproofer and additive.Water and frostproofer are basal liquids, and additive mainly is inhibiter, defoamer and colorant.Regulation according to China's standard SH0521-1999 technical requirements or USS ASTM-D-3306, metals such as cooling fluid reply steel, cast iron, red copper, brass, cast aluminium, scolding tin have corrosion inhibition, therefore borax commonly used, amine, nitrite, phosphoric acid salt, silicate, carboxylic acid, nitrogen heterocyclic etc. are as inhibiter when preparing cooling fluid, regulate the pH value simultaneously and guarantee corrosion inhibition to metal.But the instability that when introducing inhibiter, also causes cooling fluid, for example introducing of water glass, 2-mercaptobenzothiazole (MBT), benzotriazole (BTA), methyl benzotriazole (TTA).Water glass and 2-mercaptobenzothiazole (MBT) are the good inhibiter of aluminium and alloy thereof, benzotriazole (BTA) and methyl benzotriazole (TTA) are the inhibiter of copper and copper alloy, but both have bad influence to the stability of cooling fluid, easily produce flocks.Silicate is stablized by the stablizer of silicon at present, and TTA, BTA are water-soluble hardly, solubleness is also very little in alcohols, be subjected to photosensitized reaction easily to produce precipitation, cause the instability of cooling fluid, therefore the inhibition to copper and alloy thereof receives much concern, and provides a kind of long-acting stable automobile engine cooling liquid to copper and alloy inhibition thereof just to become the problem that this technical field urgent need will solve.

Summary of the invention

Purpose of the present invention just provides a kind of automobile engine cooling liquid and preparation method, this is a kind of stable, cooling fluid that corrosion inhibition for metal is respond well, can overcome the problems referred to above that existing cooling fluid adopts BTA, TTA to bring as the inhibiter of copper and alloy thereof.

Technical scheme of the present invention is as follows:

The composition and the proportioning of this automobile engine cooling liquid are:

Component title weight part

Deionized water 70～50

Ethylene glycol 30～50

Trolamine 0.5～1.5

Borax 0.5～1.5

Phosphoric acid 0.05～0.15

Thiazole sodium 0.15～0.25

Alkylamine benzoglyoxaline 0.05～0.15

Sodium hydroxide 0.05～0.15

Silicon stablizer 0.05～0.15

Water glass 0.05～0.15

Defoamer is an amount of

Colorant is an amount of

Wherein:

Thiazole sodium is one or both composite in thyroidan disodium (NATD) and the mercaptobenzothiazole sodium (NACAP), and compound proportion can be any ratio.

The alkylamine benzoglyoxaline is a 2-amylamine benzoglyoxaline (PAB).

The silicon stablizer is 3-(trihydroxy methyl siloxanes)-propyl-phosplate phosphoric acid salt.

Defoamer is the dimethyl-silicon oil emulsion.

Colorant is a direct fast blue.

A kind of automobile engine cooling liquid and preparation method contain following steps;

Step 1, add the deionized water of the above-mentioned share of part in having the reactor of agitator, add the ethylene glycol of above-mentioned share again, above-mentioned share phosphoric acid and above-mentioned share borax are stirred well to whole dissolvings;

Step 2, have the deionized water that adds the above-mentioned share of part in the reactor of agitator at another, add the water glass of trolamine, sodium hydroxide, alkylamine benzoglyoxaline, thiazole sodium, silicon stablizer and the above-mentioned share of above-mentioned share again, be stirred well to whole dissolvings;

The mixing of materials of step 1 and step 2 is stirred, and add proper quantity of defoaming agent dimethyl-silicon oil emulsion and colorant direct fast blue, promptly make cooling fluid of the present invention.

Added the inhibiter of new copper in the automobile engine cooling liquid provided by the invention, thiazole sodium and alkylamine benzoglyoxaline.Thiazole sodium is that in dimercapto thiazole disodium (NATD) and the mercaptobenzothiazole sodium (NACAP) one or both are composite, and compound proportion can be any ratio, and the alkylamine benzoglyoxaline is a 2-amylamine benzoglyoxaline (PAB).These several compositions are all water-soluble, and corrosion mitigating effect is good in pH value 6～11, and consumption is little, good stability.This cooling fluid is general throughout the year, have anti-boil, antifreeze, anti-cavitation erosion, corroding metal and have characteristics such as scale inhibition not, over-all properties meets the SH0521-1999 technical requirements.Especially solved in traditional cooling fluid add copper played the composition of corrosion inhibition after, problems such as the solution instability that occurs, precipitation, more stable quality is reliable, and the cooling system that is fit to different areas weather condition and domestic and international various model motor car engines uses, and has good effect.

Embodiment

The present invention will be further described below by specific embodiment:

Embodiment 1

Step 1, add the deionized water of 20kg in having the reactor of agitator, add the ethylene glycol of 30kg again, 0.1kg phosphoric acid and 1kg borax are stirred well to whole dissolvings.

Step 2, have at another and to add the 50kg deionized water in reactor of agitator, add 1kg trolamine, 0.1kg sodium hydroxide, 0.1kg2-amylamine benzoglyoxaline (PAB), 0.2kg mercaptobenzothiazole sodium (NACAP), 0.1kg3-(trihydroxy methyl siloxanes)-propyl-phosplate phosphoric acid salt and 0.1kg water glass again, be stirred well to whole dissolvings.

The mixing of materials of step 1 and step 2 is stirred, and add an amount of dimethyl-silicon oil emulsion and direct fast blue, promptly make cooling fluid 1 of the present invention.

Embodiment 2

Step 1, add the deionized water of 30kg in having the reactor of agitator, add the ethylene glycol of 40kg again, 0.05kg phosphoric acid and 0.51kg borax are stirred well to whole dissolvings.

Step 2, have at another and to add the 30kg deionized water in reactor of agitator, add 0.5kg trolamine, 0.05kg sodium hydroxide, 0.05kg2-amylamine benzoglyoxaline (PAB), 0.15kg thyroidan disodium (NATD), 0.05kg3-(trihydroxy methyl siloxanes)-propyl-phosplate phosphoric acid salt and 0.05kg water glass again, be stirred well to whole dissolvings.

The mixing of materials of step 1 and step 2 is stirred, and add an amount of dimethyl-silicon oil emulsion and direct fast blue, promptly make cooling fluid 2 of the present invention.

Embodiment 3

Step 1, add the deionized water of 25kg in having the reactor of agitator, add the ethylene glycol of 50kg again, 0.15kg phosphoric acid and 1.5kg borax are stirred well to whole dissolvings.

Step 2, have at another and to add the 25kg deionized water in reactor of agitator, add 1.5kg trolamine, 0.15kg sodium hydroxide, 0.15kg2-amylamine benzoglyoxaline (PAB), 0.15kg thyroidan disodium (NATD), 0.1kg mercaptobenzothiazole sodium (NACAP), 0.15kg3-(trihydroxy methyl siloxanes)-propyl-phosplate phosphoric acid salt and 0.15kg water glass again, be stirred well to whole dissolvings.

The mixing of materials of step 1 and step 2 is stirred, and add an amount of dimethyl-silicon oil emulsion and direct fast blue, promptly make cooling fluid 3 of the present invention.

Cooling fluid 1 of the present invention is carried out the glassware corrosion test, cooling fluid 2 of the present invention is simulated service test, cooling fluid 3 of the present invention is carried out cast aluminium heat transfer corrosion test.The result is respectively shown in following table 1, table 2, table 3.

Table 1 glassware corrosion test result

Table 2 simulation service test result

Table 3 cast aluminium heat transfer corrosion test result

Shown in table 1,2,3 result, show that cooling fluid of the present invention has excellent corrosion inhibition to multiple metal, good to copper and alloy corrosion inhibition thereof especially, good stability.Show that through placement in a year solution is transparent and stable still, the muddiness, the instability that occur behind the traditional copper inhibition ingredient as adding occur.

Claims (3)

1. automobile engine cooling liquid is characterized in that the composition of cooling fluid and proportioning are as follows:

Component title weight part

Deionized water 70～50

Ethylene glycol 30～50

Trolamine 0.5～1.5

Borax 0.5～1.5

Phosphoric acid 0.05～0.15

Thiazole sodium 0.15～0.25

Alkylamine benzoglyoxaline 0.05～0.15

Sodium hydroxide 0.05～0.15

Silicon stablizer 0.05～0.15

Water glass 0.05～0.15

Defoamer is an amount of

Colorant is an amount of;

The alkylamine benzoglyoxaline is a 2-amylamine benzoglyoxaline.

2. automobile engine cooling liquid according to claim 1 is characterized in that defoamer is the dimethyl-silicon oil emulsion.

3. automobile engine cooling liquid according to claim 1 is characterized in that colorant is a direct fast blue.