Cooling liquid additive capable of being used for engine and cooling liquid

Abstract

The invention relates to a cooling liquid additive capable of being used for an engine and cooling liquid. The cooling liquid additive comprises the following components in parts by weight: 0.5-4 parts of a corrosion inhibitor and 0.5-4 parts of an anti-fouling agent, the corrosion inhibitor is glutamic acid-N, N diacetic acid tetrasodium salt and / or N, N-dicarboxymethyl alanine trisodium salt; the anti-fouling agent is polyepoxysuccinic acid and / or polyaspartic acid. The cooling liquid additive, ethylene glycol and / or propylene glycol and water are used as raw materials, a cooling liquid with good biodegradability and excellent performance can be prepared, and the cooling liquid additive is free of phosphorus, low in toxicity and environmentally friendly and has excellent metal corrosion inhibition and protection capacity, good scale and corrosion inhibition effects and good non-metal material compatibility.

Description

Technical Field

[0001] The invention relates to a coolant additive and a coolant which can be used for an engine. Background Art

[0002] The engine cooling system plays an important role in the automobile power system. The cooling system can reasonably adjust and control the temperature when the engine is working, so that the engine components remain at a normal operating temperature, thereby obtaining ideal power output and good fuel economy.

[0003] Coolant is composed of water, antifreeze and additives. According to the different antifreeze ingredients, it can be divided into alcohol type, glycerin type, ethylene glycol type and other types of coolants. Alcohol type coolant and glycerin type coolant are gradually being eliminated or are used less; ethylene glycol type coolant is made by using ethylene glycol as antifreeze and adding a small amount of anti-foaming, anti-corrosion and other comprehensive additives. Ethylene glycol can be miscible with water in any proportion and can be made into coolants with various freezing points. Its lowest freezing point can reach -68℃. It has the characteristics of high boiling point, low foaming tendency, good viscosity-temperature performance, anti-corrosion and anti-scaling, etc. It is an ideal coolant. At present, the coolants used in domestic and foreign engines and sold on the market are almost all this type of ethylene glycol type coolant.

[0004] Coolant has the functions of cooling, antifreeze, anti-boiling, anti-corrosion, anti-rust, and anti-scaling. Among them, anti-corrosion is mainly achieved through corrosion inhibitors. Coolant is divided into inorganic, mixed and organic (OAT) according to the type of corrosion inhibitor. Inorganic corrosion inhibitors are usually inorganic salts, such as nitrates, silicates, phosphates, borates, amine salts, etc. Organic types are mainly organic carboxylic acid compounds, including monobasic acids, dibasic acids, tribasic acids, aromatic acids, etc. Compared with inorganic coolants, organic coolants have more stable and long-lasting anti-corrosion effects. Currently, OAT, Si-OAT, and P-OAT are more commonly used. Phosphate is a nutrient source for microorganisms in water. Its discharge will cause eutrophication of water bodies and pollute the environment. In the future, automotive coolants tend to develop phosphorus-free, green and environmentally friendly formulation systems. Summary of the invention

[0005] The invention provides a coolant additive and a coolant that can be used for an engine, which have good biodegradability, are phosphorus-free, low-toxic, and environmentally friendly, have excellent metal corrosion inhibition and protection capabilities, have good scale and corrosion inhibition effects, and have good compatibility with non-metallic materials.

[0006] The invention provides a coolant additive composition, comprising the following components in parts by weight: 0.5 to 4 parts of a corrosion inhibitor and 0.5 to 4 parts of an antifouling agent; the corrosion inhibitor is tetrasodium glutamate-N,N-diacetate and / or trisodium N,N-dicarboxymethylalanine; the antifouling agent is polyepoxysuccinic acid and / or polyaspartic acid.

[0007] The coolant additive composition of the present invention, through the combination of the corrosion inhibitor and the antifouling agent, can make the coolant have excellent metal corrosion inhibition and protection ability, good scale and corrosion inhibition effect, and good compatibility with non-metallic materials. At the same time, the coolant additive of the present invention can be used for both ethylene glycol-water type coolants and propylene glycol-water type coolants, and has a wide range of applications.

[0008] The coolant additive composition provided by the present invention comprises the following components in parts by weight: 1 to 3.5 parts of a corrosion inhibitor and 1 to 3.5 parts of an antifouling agent.

[0009] The coolant additive composition provided by the present invention comprises the following components in parts by weight: 1.5 to 3 parts of a corrosion inhibitor and 1.5 to 3 parts of an antifouling agent.

[0010] According to the coolant additive composition provided by the present invention, the weight ratio of the corrosion inhibitor to the antifouling agent is (1-4):(1-4), and can be optionally (1-3):(1-3), for example, 1:1, 1:2, 1:3, 1:4, 4:1, 3:1, 2:1, 0.8:1.2, 1.2:0.8, 2.8:0.8, 2.8:1.2, 3.2:1.2.

[0011] The coolant additive composition provided by the present invention consists of a corrosion inhibitor and an antifouling agent.

[0012] The present invention also provides a coolant additive, comprising the coolant additive composition and one or more of a buffer, an antifoaming agent and an acidity regulator.

[0013] The buffer may be tris or glycine.

[0014] The anti-foaming agent may be polydimethylsiloxane.

[0015] The acidity regulator can be selected from sodium hydroxide or potassium hydroxide.

[0016] The coolant additive provided by the present invention comprises the following components in parts by weight: 0.5 to 4 parts of corrosion inhibitor, 0.5 to 4 parts of antifouling agent, 0.05 to 0.6 parts of buffer, 0.001 to 0.04 parts of antifoaming agent, and 0.1 to 0.8 parts of acidity regulator.

[0017] Preferably, the coolant additive comprises the following components in parts by weight: 1 to 3.5 parts of corrosion inhibitor, 1 to 3.5 parts of antifouling agent, 0.1 to 0.5 parts of buffer, 0.002 to 0.03 parts of antifoaming agent, and 0.2 to 0.6 parts of acidity regulator.

[0018] In some embodiments of the present invention, the coolant additive includes the following ingredients in parts by weight: 1.5 to 3 parts of corrosion inhibitor, 1.5 to 3 parts of antifouling agent, 0.2 to 0.4 parts of buffer, 0.005 to 0.02 parts of antifoaming agent, and 0.3 to 0.5 parts of acidity regulator.

[0019] The present invention also provides an engine coolant, comprising the coolant additive composition or the coolant additive.

[0020] Preferably, the coolant additive composition accounts for 1 to 10 wt % of the coolant, and more preferably 2 to 8 wt %.

[0021] Preferably, the coolant additive accounts for 1 to 15 wt % of the coolant, and more preferably 2 to 10 wt %.

[0022] The engine coolant provided by the present invention further comprises antifreeze and water.

[0023] Preferably, the antifreeze agent is ethylene glycol or propylene glycol.

[0024] Further preferably, the antifreeze agent is ethylene glycol.

[0025] Preferably, the water is deionized water.

[0026] The cooling liquid provided according to the present invention further comprises a coloring agent.

[0027] The pH of the cooling liquid provided by the present invention is 7.5-9.0.

[0028] Preferably, based on the total mass of the coolant, the content of the antifreeze agent in the coolant is 30-60wt%, and the content of water is 40-70wt% (preferably 45-65wt%).

[0029] In some embodiments of the present invention, the coolant comprises the following components in parts by weight: 0.5 to 4 parts of corrosion inhibitor, 0.5 to 4 parts of antifouling agent, 30 to 60 parts of antifreeze agent and 40 to 70 parts of water.

[0030] In some embodiments of the present invention, the coolant comprises the following components in parts by weight: 0.5 to 4 parts of corrosion inhibitor, 0.5 to 4 parts of antifouling agent, 30 to 60 parts of antifreeze agent and 40 to 70 parts of water, and 0.001 to 0.002 parts of colorant.

[0031] According to the coolant provided by the present invention, the coolant is composed of: 0.8-1.2 parts of tetrasodium glutamate-N,N diacetate or trisodium N,N-dicarboxymethyl alanine, 0.8-1.2 parts of polyepoxysuccinic acid or polyaspartic acid, 0.05-0.15 parts of trihydroxymethylaminomethane or glycine, 0.004-0.006 parts of polydimethylsiloxane, 0.25-0.35 parts of NaOH, 35-41 parts of ethylene glycol, and 57-63 parts of deionized water.

[0032] According to the coolant provided by the present invention, the coolant is composed of: 2.8 to 3.2 parts of tetrasodium glutamate-N,N diacetate, 0.8 to 1.2 parts of polyaspartic acid, 0.45 to 0.55 parts of trihydroxymethylaminomethane, 0.015 to 0.025 parts of polydimethylsiloxane, 0.45 to 0.55 parts of NaOH, 48 to 54 parts of ethylene glycol, and 41 to 47 parts of deionized water.

[0033] According to the coolant provided by the present invention, the coolant is composed of: 0.8-1.2 parts of trisodium N,N-dicarboxymethyl alanine, 2.8-3.2 parts of polyepoxysuccinic acid, 0.45-0.55 parts of glycine, 0.015-0.025 parts of polydimethylsiloxane, 0.45-0.55 parts of NaOH, 52-58 parts of ethylene glycol, and 37-43 parts of deionized water.

[0034] According to the coolant provided by the present invention, the coolant is composed of: 1.8 to 2.2 parts of tetrasodium glutamate-N,N diacetate, 1.8 to 2.2 parts of polyepoxysuccinic acid, 0.25 to 0.35 parts of glycine, 0.005 to 0.015 parts of polydimethylsiloxane, 0.35 to 0.45 parts of NaOH, 40 to 46 parts of ethylene glycol, and 49 to 55 parts of deionized water.

[0035] According to the coolant provided by the present invention, the composition of the coolant is, in parts by weight:

[0036]

[0037]

[0038] Or, in parts by weight, the coolant comprises:

[0039]

[0040] Or, in parts by weight, the coolant comprises:

[0041]

[0042] Or, in parts by weight, the coolant comprises:

[0043]

[0044] Or, in parts by weight, the coolant comprises:

[0045]

[0046]

[0047] The engine coolant provided by the present invention has good biodegradability, is phosphorus-free, low in toxicity, is environmentally friendly, has excellent metal corrosion inhibition and protection capabilities, has good scale and corrosion inhibition effects, and has good compatibility with non-metallic materials.

[0048] The present invention also provides a method for preparing the above engine coolant, comprising the following steps:

[0049] The corrosion inhibitor, antifouling agent, buffer, antifreeze agent and acidity regulator are dissolved in water, stirred at room temperature (for example, 30 to 60 minutes), and then the antifoaming agent is added and stirred (for example, 10 to 20 minutes).

[0050] The preparation method provided by the present invention further comprises, finally adding a dye and continuing stirring for 10 to 20 minutes;

[0051] Preferably, 0.001 to 0.002 parts of the coloring agent are added (per 100 parts of the cooling liquid).

[0052] The present invention also provides the coolant additive composition, the coolant additive, and the use of the engine coolant in an engine.

[0053] The present invention has at least one of the following beneficial effects:

[0054] 1) The coolant additive of the present invention can be combined with ethylene glycol or propylene glycol to prepare a coolant, and has a wide range of applications.

[0055] 2) The engine coolant of the present invention adopts ethylene glycol antifreeze, which can be miscible with water in any proportion, has low toxicity, and can be prepared into coolants with various freezing points, the lowest freezing point of which can reach -68°C. It has the characteristics of high boiling point, low foaming tendency, good viscosity-temperature performance, anti-corrosion and anti-scaling, etc.

[0056] 3) The engine coolant of the present invention has good biodegradability, is phosphorus-free, low in toxicity, and is environmentally friendly. It has excellent metal corrosion inhibition and protection capabilities, has good scale and corrosion inhibition effects, and meets the requirements for the use of engine coolants.

[0057] 4) The engine coolant of the present invention has good compatibility with non-metallic materials, which ensures the reliability of non-metallic materials such as engine seals during use and reduces the risk of leakage. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] In order to achieve the object of the present invention, the present invention provides an engine coolant, comprising the following components in parts by weight (based on 100 parts by total weight of the coolant):

[0060]

[0061] Preferably, the engine coolant comprises the following components in parts by weight:

[0062]

[0063] The weight parts mentioned in the present invention can be weight units known in the art such as mg, g, kg, etc., or multiples thereof, such as 1 / 10, 1 / 100, 10 times, 100 times, etc.

[0064] The corrosion inhibitor is tetrasodium glutamate-N,N diacetate or trisodium N,N-dicarboxymethyl alanine. The corrosion inhibitor has excellent chelating ability, good biodegradability, is phosphorus-free, non-toxic, and environmentally friendly, can be used in a wide pH range, has excellent metal corrosion inhibition and protection ability, has good scale and corrosion inhibition effect, and has good compatibility with non-metallic materials.

[0065] The anti-fouling agent is polyepoxysuccinic acid or polyaspartic acid. The anti-fouling agent has the dual functions of scale inhibition and corrosion inhibition, good biodegradability, phosphorus-free, non-toxic, environmentally friendly, and good scale inhibition and dispersion effect.

[0066] The buffer is tris(hydroxymethyl)aminomethane or glycine, is easily soluble in water, has a good buffering effect, and has an applicable pH value range of 7.0 to 9.0.

[0067] The anti-foaming agent is polydimethylsiloxane, has good biocompatibility, is non-toxic and tasteless, has good chemical stability, has a small dosage, has a good anti-foaming effect, and can be used for a long time at -50°C to 200°C.

[0068] The acidity regulator is preferably NaOH. The acidity regulator can effectively adjust the pH value of the coolant to ensure that the coolant is at a suitable pH value.

[0069] The antifreeze is preferably ethylene glycol, which is miscible with water in any proportion, has low toxicity, can be prepared into cooling liquids with various freezing points, and its lowest freezing point can reach -68°C, has high boiling point, low foaming tendency, good viscosity-temperature performance, anti-corrosion and anti-scaling characteristics.

[0070] The water is preferably deionized water.

[0071] The method for preparing the engine coolant of the present invention comprises the following steps:

[0072] Dissolve the corrosion inhibitor, antifouling agent, buffer, antifreeze agent and acidity regulator in water according to the proportion, stir at room temperature for 30 to 60 minutes, then add the antifoaming agent, stir for 10 to 20 minutes, and finally add the dye, and continue stirring for 10 to 20 minutes.

[0073] The present invention further protects the use of the engine coolant, preferably in an automobile engine.

[0074] The glassware corrosion test, cast aluminum alloy heat transfer corrosion test, stability test, and non-metallic material compatibility test of the engine coolant provided by the present invention are shown in Table 1:

[0075] Table 1 Engine coolant performance requirements

[0076]

[0077] Example 1

[0078] The composition of engine coolant is:

[0079]

[0080]

[0081] Example 2

[0082] The composition of engine coolant is:

[0083]

[0084] Example 3

[0085] The composition of engine coolant is:

[0086]

[0087] Example 4

[0088] The composition of engine coolant is:

[0089]

[0090]

[0091] Example 5

[0092] The composition of engine coolant is:

[0093]

[0094] The engine coolants provided in Examples 1 to 5 were tested according to the performance requirements in Table 1. The test results are shown in Table 2.

[0095] Table 2 Engine coolant test results

[0096]

[0097]

[0098] The engine coolant test results show that the engine coolant provided by the present invention has good biodegradability, is phosphorus-free, low in toxicity, is environmentally friendly, has excellent metal corrosion inhibition and protection capabilities, has good scale and corrosion inhibition effects, and has good compatibility with non-metallic materials.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An engine coolant additive composition, characterized in that: The invention comprises the following components by weight: 0.5 to 4 parts of corrosion inhibitor and 0.5 to 4 parts of antifouling agent; the corrosion inhibitor is tetrasodium glutamate-N,N-diacetate and / or trisodium N,N-dicarboxymethylalanine; the antifouling agent is polyepoxysuccinic acid and / or polyaspartic acid.

2. The coolant additive composition according to claim 1, characterized in that: The composition comprises the following components by weight: 1 to 3.5 parts of corrosion inhibitor and 1 to 3.5 parts of antifouling agent; Optionally, the following components are included in weight: 1.5 to 3 parts of corrosion inhibitor and 1.5 to 3 parts of antifouling agent; Optionally, the weight ratio of the corrosion inhibitor and the antifouling agent is (1-4):(1-4), optionally (1-3):(1-3), for example 1:1, 1:2, 1:3, 1:4, 4:1, 3:1, 2:1, 0.8:1.2, 1.2:0.8, 2.8:0.8, 2.8:1.2, 3.2:1.

2.

3. A coolant additive, characterized in that: A coolant additive composition comprising the coolant additive composition of claim 1 or 2, further comprising one or more of a buffer, an antifoaming agent and an acidity regulator; The buffer may be tris(hydroxymethyl)aminomethane or glycine; The anti-foaming agent may be polydimethylsiloxane; The acidity regulator can be selected from sodium hydroxide or potassium hydroxide.

4. The coolant additive according to claim 3, characterized in that: The invention comprises the following components in parts by weight: 0.5 to 4 parts of the corrosion inhibitor, 0.5 to 4 parts of the antifouling agent, 0.05 to 0.6 parts of a buffer, 0.001 to 0.04 parts of an antifoaming agent, and 0.1 to 0.8 parts of an acidity regulator; Preferably, the composition comprises the following components in parts by weight: 1 to 3.5 parts of the corrosion inhibitor, 1 to 3.5 parts of the antifouling agent, 0.1 to 0.5 parts of a buffer, 0.002 to 0.03 parts of an antifoaming agent, and 0.2 to 0.6 parts of an acidity regulator; Preferably, the following components are included in parts by weight: 1.5 to 3 parts of corrosion inhibitor, 1.5 to 3 parts of antifouling agent, 0.2 to 0.4 parts of buffer, 0.005 to 0.02 parts of antifoaming agent, and 0.3 to 0.5 parts of acidity regulator.

5. An engine coolant, characterized in that: A coolant additive composition comprising the coolant additive composition of claim 1 or 2, or a coolant additive comprising the coolant additive of claim 3 or 4; Preferably, the coolant additive composition accounts for 1 to 10 wt % of the coolant, more preferably 2 to 8 wt %; Preferably, the coolant additive accounts for 1 to 15 wt % of the coolant, more preferably 2 to 10 wt %; Preferably, the pH of the cooling liquid is 7.5-9.

0.

6. The engine coolant according to claim 5, characterized in that: Also includes antifreeze and water; Preferably, the antifreeze agent is ethylene glycol or propylene glycol; Preferably, based on the total mass of the coolant, the content of the antifreeze agent in the coolant is 30-60wt%, and the content of water is 40-70wt% (preferably 45-65wt%).

7. The engine coolant according to claim 5, characterized in that: The engine coolant is composed of: 0.8-1.2 parts of tetrasodium glutamate-N,N-diacetate or trisodium N,N-dicarboxymethylalanine, 0.8-1.2 parts of polyepoxysuccinic acid or polyaspartic acid, 0.05-0.15 parts of trishydroxymethylaminomethane or glycine, 0.004-0.006 parts of polydimethylsiloxane, 0.25-0.35 parts of NaOH, 35-41 parts of ethylene glycol, and 57-63 parts of deionized water.

8. The engine coolant according to claim 5, characterized in that: The engine coolant is composed of: 2.8-3.2 parts of tetrasodium glutamate-N,N diacetate, 0.8-1.2 parts of polyaspartic acid, 0.45-0.55 parts of trishydroxymethylaminomethane, 0.015-0.025 parts of polydimethylsiloxane, 0.45-0.55 parts of NaOH, 48-54 parts of ethylene glycol, and 41-47 parts of deionized water; Optionally, the engine coolant is composed of: 0.8-1.2 parts of trisodium N,N-dicarboxymethyl alanine, 2.8-3.2 parts of polyepoxysuccinic acid, 0.45-0.55 parts of glycine, 0.015-0.025 parts of polydimethylsiloxane, 0.45-0.55 parts of NaOH, 52-58 parts of ethylene glycol, and 37-43 parts of deionized water; Optionally, the engine coolant is composed of: 1.8 to 2.2 parts of tetrasodium glutamate-N,N diacetate, 1.8 to 2.2 parts of polyepoxysuccinic acid, 0.25 to 0.35 parts of glycine, 0.005 to 0.015 parts of polydimethylsiloxane, 0.35 to 0.45 parts of NaOH, 40 to 46 parts of ethylene glycol, and 49 to 55 parts of deionized water.

9. The method for preparing the engine coolant according to any one of claims 5 to 8, characterized in that: include: Dissolve the corrosion inhibitor, antifouling agent, buffer, antifreeze agent and acidity regulator in water, stir at room temperature, then add the antifoaming agent and stir.

10. Use of the coolant additive composition according to claim 1 or 2, the coolant additive according to claim 3 or 4, or the engine coolant according to any one of claims 5 to 8 in an engine.

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