CN107987803B

CN107987803B - Phosphorus-containing engine coolant and preparation method thereof

Info

Publication number: CN107987803B
Application number: CN201610947260.9A
Authority: CN
Inventors: 张春辉; 樊秀菊; 张凯蛟; 杨兵; 丁烨; 王荷菲
Original assignee: China Petroleum and Chemical Corp
Current assignee: China Petroleum and Chemical Corp
Priority date: 2016-10-26
Filing date: 2016-10-26
Publication date: 2021-03-05
Anticipated expiration: 2036-10-26
Also published as: CN107987803A

Abstract

The invention provides a phosphorus-containing engine coolant which comprises the following components in parts by weight: 0.5-3% of phosphorus-containing corrosion inhibitor, 0.5-3% of scale inhibitor, 0.1-1% of buffering agent, 0.001-0.1% of defoaming agent, 0.5-1.0% of alkaline pH value regulator, 30-60% of organic solvent and the balance of water. The phosphorus-containing engine coolant adopts an additive enrichment culture technology, effectively solves the problem of poor hard water stability of the phosphorus-containing coolant, and has good compatibility with hard water; the phosphorus-containing engine coolant has excellent metal corrosion inhibition performance and meets the use requirement of the engine coolant; meanwhile, the coating has good compatibility with non-metallic materials, ensures the protection of the non-metallic materials in the using process and prolongs the service life of the non-metallic materials.

Description

Phosphorus-containing engine coolant and preparation method thereof

Technical Field

The invention relates to a phosphorus-containing engine coolant, in particular to an engine coolant which has excellent corrosion inhibition performance of aluminum and soldering tin metal, and simultaneously has good hard water compatibility and better non-metallic material compatibility.

Background

As engine power increases, the size continues to shrink, emissions are tightly controlled, thermal loads and related reliability issues become more and more prominent, and the importance of cooling systems increases.

The engine coolant mainly comprises water, glycol and additives, wherein the two additives mainly comprise a corrosion inhibitor, the additives mainly have the functions of corrosion prevention and scale prevention and foam resistance, the base liquid of most of the existing coolants is basically glycol, and different corrosion inhibition systems are mainly adopted according to different formulas. Most of coolant products in the current market adopt silicon-containing or organic acid type as corrosive agents, the products basically have advantages and disadvantages, particularly for Japanese and Korean automobiles, coolant of a phosphorus-containing system is generally adopted, along with the gradual increase of the Japanese and Korean automobiles, phosphorus-containing coolant products with more excellent performance need to be developed, and because the traditional phosphate can reduce the protection effect on aluminum at high temperature and can also be combined with calcium and magnesium ions in hard water to form floccule precipitates to block a radiator coil, so that the coolant is not smooth to flow and generate overheating, the defects of a phosphorus-containing formula need to be improved, and the requirements of modern engines are met.

Disclosure of Invention

The phosphorus-containing engine coolant provided by the invention has excellent corrosion inhibition performance of aluminum and soldering tin metal, and simultaneously has good hard water compatibility and better non-metallic material compatibility.

Specifically, the phosphorus-containing engine coolant provided by the invention comprises the following components in percentage by weight:

as a preferable scheme, the phosphorus-containing engine coolant comprises the following components in percentage by weight:

the weight parts in the invention can be weight units known in the art such as mg, g, kg, etc., and can also be multiples thereof, such as 1/10, 1/100, 10, 100, etc.

The phosphorus-containing corrosion inhibitor is 2-hydroxyphosphonoacetic acid or hydroxyethylidene diphosphonic acid. The corrosion inhibitor has excellent corrosion inhibition performance on various metals such as cast aluminum, soldering tin, cast iron and the like.

The scale inhibitor is ethylenediamine tetramethylene phosphonic acid or ethylenediamine tetramethylene phosphonic acid. The scale inhibitor has strong metal ion chelating capacity, and can ensure the stability of the solution when used in cooling liquid.

The buffer is 3-hydroxy-3-carboxyl glutaric acid or 2-hydroxysuccinic acid. Is easy to dissolve in water, has no harm to human body and environment, and has more excellent buffering effect when being used with phosphoric acid corrosion inhibitor in solution.

The defoaming agent is PE 6100.

The alkaline pH value regulator is preferably NaOH, so that the pH value of the solvent can be effectively regulated, and the excellent metal corrosion inhibition performance of the stabilizer of the cooling liquid product is ensured.

The organic solvent is preferably ethylene glycol. The present inventors have found that the use of 2-hydroxyphosphonoacetic acid or hydroxyethylidenediphosphonic acid in an aqueous solution of ethylene glycol allows for better compatibility of the engine coolant solution with the rubber.

The water is preferably deionized water.

On the basis of optimizing the selection of each component, the phosphorus-containing engine coolant preferably comprises the following components in percentage by weight:

further preferably comprises the following components in percentage by weight:

or the components with the following weight percentages:

as a preferable scheme of the invention, the phosphorus-containing engine coolant comprises the following components in percentage by weight:

according to the invention, a great deal of practice shows that the phosphorus-containing engine coolant prepared by adopting the preferable scheme has extremely excellent aluminum corrosion inhibition performance and hard water compatibility, and has extremely high application value.

In the practical application process, a coloring agent can be additionally added into the phosphorus-containing engine coolant, and the color and the dosage of the coloring agent can be added according to the requirement.

The phosphorus-containing engine coolant provided by the invention can be prepared according to a conventional method in the field. As a preferred embodiment of the present invention, the following steps can be adopted: dissolving the phosphorus-containing corrosion inhibitor, the scale inhibitor, the buffering agent, the organic solvent and the pH regulator in water according to the proportion, stirring at normal temperature for 30-60 minutes, adding the defoaming agent, and stirring for 15-20 minutes.

When a coloring agent is additionally added into the phosphorus-containing engine coolant, the following method can be adopted: directly adding a coloring agent into the phosphorus-containing engine coolant prepared by the method, and stirring for 10-15 minutes. Because the defoaming agent is finally dispersed in the solution, the defoaming agent must be uniformly stirred to be fully dispersed, and then the coloring agent is added to ensure that the coloring agent is also in a uniform state in the solution.

The phosphorus-containing engine coolant provided by the invention is applied to engines, preferably automobile engines.

The glassware corrosion test, the cast aluminum heat transfer corrosion test, the aluminum deposition test and the non-metallic material compatibility test of the phosphorus-containing engine coolant provided by the invention are shown in the following table 1:

TABLE 1 Performance index for phosphorus-containing Engine coolants

Compared with the prior art, the phosphorus-containing engine coolant has the following advantages and effects:

(1) the phosphorus-containing engine coolant of the invention adopts an additive enrichment culture technology, effectively solves the problem of poor hard water stability of the phosphorus-containing coolant, and has good compatibility with hard water.

(2) The phosphorus-containing engine coolant has excellent metal corrosion inhibition performance and meets the use requirement of the engine coolant.

(3) The phosphorus-containing engine coolant has good non-metallic material compatibility, ensures the protection of the non-metallic material in the use process, and prolongs the service life of the non-metallic material.

Detailed Description

The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Example 1

The phosphorus-containing engine coolant comprises the following components:

example 2

The phosphorus-containing engine coolant comprises the following components:

example 3

The phosphorus-containing engine coolant comprises the following components:

example 4

The phosphorus-containing engine coolant comprises the following components:

example 5

The phosphorus-containing engine coolant comprises the following components:

example 6

The embodiment provides a preparation method of a phosphorus-containing engine coolant, which specifically comprises the following steps: dissolving the corrosion inhibitor, the buffering agent, the scale inhibitor, the organic solvent and the sodium hydroxide in water according to the proportion, stirring for 45 minutes at normal temperature, adding the defoaming agent, and stirring for 20 minutes.

The phosphorus-containing engine coolants of examples 1 to 5 were prepared by the above methods.

The phosphorus-containing engine coolants provided in examples 1 to 5 were evaluated according to the performance index method in table 1, and the test results are shown in table 2.

TABLE 2 inspection results of phosphorus-containing engine coolants

The inspection result of the phosphorus-containing engine coolant shows that the phosphorus-containing engine coolant provided by the invention has excellent corrosion inhibition performance of aluminum and soldering tin metal, and simultaneously has hard water compatibility and better non-metallic material compatibility. The phosphorus-containing engine coolant provided in example 3 has the most excellent aluminum corrosion inhibition performance and hard water compatibility, and has a very strong application value.

Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. The phosphorus-containing engine coolant is characterized by comprising the following components in percentage by weight:

2.8-3% of 2-hydroxyphosphonoacetic acid;

0.7-0.9% of ethylenediamine tetramethylene phosphonic acid;

0.2-0.4% of 3-hydroxy-3-carboxyl glutaric acid;

PE6100 0.008~0.012%；

NaOH 0.6~0.8%；

48-52% of ethylene glycol;

the balance of deionized water.

2. The preparation method of the phosphorus-containing engine coolant as claimed in claim 1, wherein the phosphorus-containing corrosion inhibitor 2-hydroxyphosphonoacetic acid, the scale inhibitor ethylenediamine tetramethylenephosphonic acid, the buffer 3-hydroxy-3-carboxyglutaric acid, the organic solvent ethylene glycol and the pH regulator NaOH are dissolved in deionized water according to the mixture ratio, stirred at normal temperature for 30-60 minutes, added with the defoamer PE6100, and stirred for 15-20 minutes.