Anti-freezing solution based on 2-methyl-1, 3-propylene glycol and preparation method thereof

Abstract

The invention relates to an anti-freezing solution based on 2-methyl-1, 3-propylene glycol and a preparation method of the anti-freezing solution. The formula of the anti-freezing solution comprises the following components in percentage by weight: 10-80% of a first component 2-methyl-1, 3-propylene glycol; the second component is 10%-80% of a hydrogen bond acceptor compound; 0.5%-2% of a scale and corrosion inhibitor; 5%-10% of a pH buffer agent; 2%-5% of a coloring agent; and 0.5%-1% of a defoaming agent. The preparation method comprises the following steps: mixing the components in proportion, heating at the temperature of 30-150 DEG C, stirring for 0.1-24 hours, and dissolving to obtain the product. The anti-freezing solution prepared by the invention is applied to the field of engine anti-freezing solutions, can resist corrosion and scale, is anti-freezing at low temperature, is resistant to high temperature, is not easy to burn and explode, has the thermal decomposition temperature of 90 DEG C or above, can ensure the original component concentration of the anti-freezing solution for a long time, does not need to be additionally supplemented and added, and can still keep the anti-freezing solution not frozen at the temperature of-60 DEG C or below; and the paint is nontoxic and harmless, has extremely low metal corrosion, and can be placed for a long time.

Description

Technical Field

[0001] The present invention relates to the technical field of antifreeze coolant, and in particular to an antifreeze liquid based on 2-methyl-1,3-propanediol (MPD) and a preparation method thereof. Background Art

[0002] Antifreeze plays an extremely important role in automobiles and other mechanical equipment, preventing the cooling system from freezing under low temperature conditions and avoiding engine overheating or damage.

[0003] However, even though many people are working hard to solve it, there are still some problems in the field of antifreeze. Traditional antifreeze generally contains volatile solvents such as ethylene glycol or methanol.

[0004] Methanol antifreeze is highly toxic and poses a risk of poisoning by inhalation;

[0005] Ethylene glycol antifreeze is very easy to evaporate, has a short lifespan, and suffers large volatilization losses. It needs to be replenished and adjusted in time, which increases the cost of use.

[0006] Some antifreeze may also corrode metal parts in the engine and cooling system. Therefore, it is also necessary to consider the compatibility of antifreeze with different materials to prevent corrosion and damage and extend the life of the engine.

[0007] In addition, antifreeze also needs to maintain its performance under extreme temperature conditions to ensure that the engine can operate normally in various climatic conditions, helping the engine maintain a stable operating temperature under different environmental conditions and improving operating efficiency.

[0008] In view of the above requirements, the present invention proposes an MPD-based antifreeze liquid that meets the above requirements and is resistant to ultra-low temperatures.

[0009] The beneficial effect of the present invention is that the ultra-low temperature resistant MPD-based antifreeze liquid has the properties of high efficiency anti-corrosion and anti-scaling, low temperature antifreeze, and low combustion and explosion resistance, and can be used in extreme low temperature weather. Summary of the invention

[0010] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a type of antifreeze formula based on 2-methyl-1,3-propanediol (MPD), which is composed of a mixture of the following components in mass ratio:

[0011] The first component 2-methyl-1,3-propanediol (MPD) 10% to 80%;

[0012] The second component is 10% to 80% of hydrogen bond acceptor compound;

[0013] Scale and corrosion inhibitor 0.5% to 2%;

[0014] pH buffer 5% to 10%;

[0015] Colorant 2% to 5%;

[0016] Defoaming agent 0.5%~1%.

[0017] The above-mentioned second component hydrogen bond acceptor compound is selected from any one or more of choline chloride, zinc chloride, methyl trioctyl ammonium bromide, zirconium dichloride, methyl trioctyl ammonium chloride, ferric chloride, ammonium carbonate, methyl triphenyl phosphonium bromide, menthol, isosorbide, thymol, tetraethylammonium chloride, tetramethyl urea, succinonitrile, N,N-dimethylpropylene urea, benzyl triphenyl phosphonium chloride, etc.

[0018] The scale inhibitor and corrosion inhibitor is one or more of zinc sulfate, hydroxyethylidene diphosphonic acid, aminotrimethylphosphonic acid, polyacrylic acid, hydrolyzed polymaleic anhydride and the like.

[0019] The pH buffer is one or more of sodium borate, sodium silicate, sodium citrate, citric acid, tartaric acid, phosphoric acid, disodium hydrogen phosphate, potassium dihydrogen phosphate, and the like.

[0020] The colorant is one or more of methylene blue, methyl red, phenol red, phthalocyanine blue, lemon yellow, fluorescent yellow, fluorescent green and the like.

[0021] The above-mentioned defoaming agent is one or more of a higher alcohol defoaming agent, an organosilicon defoaming agent, a polysiloxane defoaming agent, a polyether-modified silicon defoaming agent, a powder defoaming agent and the like.

[0022] The preparation method of the above-mentioned antifreeze liquid based on 2-methyl-1,3-propanediol (MPD) comprises the following steps: mixing the components in proportion, heating at 30°C to 150°C, stirring for 0.1h to 24h, and dissolving to obtain the antifreeze liquid.

[0023] The antifreeze prepared by the present invention can be used in the field of engine antifreeze to prevent corrosion and scale, prevent freezing at low temperatures, withstand high temperatures, and is not easy to burn and explode. Compared with the prior art, the antifreeze based on 2-methyl-1,3-propanediol (MPD) is not easy to volatilize, and the thermal decomposition temperature is above 90°C. It can ensure the original concentration of each component of the antifreeze for a long time without additional supplementation. The antifreeze can still be kept from freezing at temperatures of -60°C and below, meeting the use requirements of extreme weather conditions. It is non-toxic and harmless, has very little corrosion to metals, and can be placed for a long time. The antifreeze uses 2-methyl-1,3-propanediol (MPD) as the first component, the raw materials are green and non-toxic, the preparation method is simple, the antifreeze performance is good, and different second components can be used in combination with 2-methyl-1,3-propanediol (MPD) to have a wider range of applications. The beneficial effect of the present invention is that the ultra-low temperature resistant antifreeze based on 2-methyl-1,3-propanediol (MPD) has the properties of high efficiency anti-corrosion and anti-scaling, low temperature antifreeze, and non-flammable and explosion-resistant, and can meet the use conditions of low temperature extreme weather. The advantages of the antifreeze based on 2-methyl-1,3-propanediol (MPD) of the present invention are that the formula of the present invention is reasonable, green and non-toxic, and the freezing point can be lower and adjustable compared with the existing technology, and the corrosion to metal is also small. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a real-time picture of the antifreeze solution in Example 1 of the present invention being placed at -100°C for 30 minutes without freezing.

[0025] Figure 2 The freezing point diagram of the antifreeze solution of Example 1 of the present invention is the freezing temperature (-122°C) of the antifreeze solution tested by differential scanning calorimetry.

[0026] Figure 3 Thermogravimetric analysis of the antifreeze solution in Example 1 of the present invention shows the thermal decomposition temperature (170°C)

[0027] Figure 4 This is a comparison of various metals in the antifreeze solution of Example 1 of the present invention before and after being placed for 6 months. The metal strips are basically

[0028] corrosion

[0029] Figure 5 This is a real-time picture of the antifreeze solution in Example 5 of the present invention being placed at -100°C for 30 minutes without freezing.

[0030] Figure 6 The freezing point diagram of the antifreeze solution of Example 5 of the present invention is the freezing temperature (-69°C) of the antifreeze solution tested by differential scanning calorimetry.

[0031] Figure 7 Thermogravimetric analysis of the antifreeze solution in Example 5 of the present invention shows the thermal decomposition temperature (115°C)

[0032] Figure 8 This is a comparison of various metals in the antifreeze solution of Example 5 of the present invention before and after being placed in it for 6 months. The metal strips are basically

[0033] corrosion

[0034] Fig. 9 This is a real-time picture of the antifreeze solution in Example 15 of the present invention not freezing after being placed at -100°C for 30 minutes

[0035] Fig.10 The freezing point diagram of the antifreeze solution of Example 15 of the present invention, measured by differential scanning calorimetry, is shown in FIG.

[0036] Fig.11 Thermogravimetric analysis of the antifreeze solution in Example 15 of the present invention shows the thermal decomposition temperature (165°C)

[0037] Fig.12 This is a comparison of various metals in the antifreeze solution of Example 15 of the present invention before and after being placed in it for 6 months. The metal strips are basically

[0038] No corrosion

[0039] Fig.13 This is a real-time picture of the antifreeze solution in Example 17 of the present invention that does not freeze after being placed at -100°C for 30 minutes.

[0040] Fig.14 The freezing point diagram of the antifreeze solution of Example 17 of the present invention, measured by differential scanning calorimetry, is shown in FIG.

[0041] Fig.15 Thermogravimetric analysis of the antifreeze solution in Example 17 of the present invention shows the thermal decomposition temperature (132°C)

[0042] Fig.16 This is a comparison of various metals in the antifreeze solution of Example 17 of the present invention before and after being placed in it for 6 months. The metal strips are basically

[0043] No corrosion

[0044] Fig.17 This is a real-time picture of the antifreeze solution in Example 19 of the present invention that does not freeze after being placed at -100°C for 30 minutes.

[0045] Fig.18 The freezing point diagram of the antifreeze solution of Example 19 of the present invention, measured by differential scanning calorimetry, is shown in FIG.

[0046] Fig.19 Thermogravimetric analysis of the antifreeze solution in Example 19 of the present invention shows the thermal decomposition temperature (97°C)

[0047] Fig. 20 This is a comparison of various metals in the antifreeze solution of Example 19 of the present invention before and after being placed in it for 6 months. The metal strips are basically

[0048] No corrosion DETAILED DESCRIPTION

[0049] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments;

[0050] Example 1

[0051] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0052] The first component is 2-methyl-1,3-propanediol (MPD) 80%; the first component is tetraethylammonium chloride 10%; the scale inhibitor is zinc sulfate 2%; the pH buffer is sodium borate 5%; the colorant is methylene blue 2%; the defoamer is high-carbon alcohol defoamer 1%; after mixing the components in proportion, heating at 120℃, stirring for 0.1h, and dissolving, the result is obtained. This ultra-low temperature resistant MPD-based antifreeze liquid has anti-corrosion and scale inhibition, low temperature antifreeze at -122℃, high temperature resistance at 170℃, and is not easy to ignite and explode, which can meet the requirements of use in extreme weather.

[0053] Example 2

[0054] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0055] The first component is 2-methyl-1,3-propanediol (MPD) 10%; the second component is choline chloride 80%; scale inhibitor and corrosion inhibitor aminotri(methylenephosphonic acid) 2%; pH buffer sodium citrate 5%; colorant phenol red 2%; defoamer polysiloxane defoamer 1%; after mixing the components in proportion, heating at 150℃, stirring for 24 hours, and dissolving, the product is obtained. This ultra-low temperature resistant MPD-based antifreeze liquid has anti-corrosion and scale inhibition, low temperature antifreeze at -108℃, high temperature resistance at 150℃, and non-flammable and explosive properties, which can meet the requirements of use in extreme weather.

[0056] Example 3

[0057] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0058] The first component is 2-methyl-1,3-propanediol (MPD) 44%; the second component is methyl trioctyl ammonium bromide 40%; the scale inhibitor and corrosion inhibitor is 0.5% hydroxyethylidene diphosphonic acid; the pH buffer is sodium silicate 10%; the colorant is methyl red 5%; the defoamer is silicone defoamer 0.5%; after mixing the components in proportion, heating at 130℃ and stirring for 2 hours, the defoamer is dissolved to obtain the product. This ultra-low temperature resistant MPD-based antifreeze liquid has anti-corrosion and scale inhibition, low temperature antifreeze at -127℃, high temperature resistance at 130℃, and is not easy to ignite and explode, which can meet the requirements of use in extreme weather.

[0059] Example 4

[0060] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0061] The first component is 2-methyl-1,3-propanediol (MPD) 50%; the second component is zirconium oxychloride 38%; scale inhibitor polyacrylic acid 1.5%; pH buffer citric acid 5.5%; colorant phthalocyanine blue 4%; defoamer 1%; after mixing the components in proportion, heating at 80℃, stirring for 0.5h, and dissolving, the product is obtained. This ultra-low temperature resistant MPD-based antifreeze liquid has anti-corrosion and scale inhibition, low temperature antifreeze at -60℃, high temperature resistance of 120℃, and non-flammable and explosive properties, which can meet the requirements of use in extreme weather.

[0062] Example 5

[0063] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0064] The first component is 2-methyl-1,3-propanediol (MPD) 60%; the second component is tetramethyl urea 28%; the scale inhibitor and corrosion inhibitor hydrolyzed polymaleic anhydride 1.5%; the pH buffer tartaric acid 7%; the colorant lemon yellow 3%; the defoamer powder defoamer 0.5%; after mixing the components in proportion, heating at 30℃, stirring for 12 hours, and dissolving, the result is obtained. This ultra-low temperature resistant MPD-based antifreeze liquid has anti-corrosion and scale inhibition, low temperature antifreeze at -69℃, high temperature resistance at 115℃, and non-flammable and explosive properties, which can meet the requirements of use in extreme weather.

[0065] Example 6

[0066] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0067] The first component is 2-methyl-1,3-propanediol (MPD) 62%; the second component is menthol 26%; the scale inhibitor and corrosion inhibitor hydrolyzed polymaleic anhydride 2%; the pH buffer phosphoric acid 6.5%; the colorant fluorescent yellow 3%; the defoamer powder defoamer 0.5%; after mixing the components in proportion, heating at 50℃, stirring for 4 hours, and dissolving, the result is obtained. This ultra-low temperature resistant MPD-based antifreeze liquid has anti-corrosion and scale inhibition, low temperature antifreeze at -150℃, high temperature resistance at 105℃, and non-flammable and explosive properties, which can meet the requirements of use in extreme weather.

[0068] Example 7

[0069] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0070] The first component is 2-methyl-1,3-propanediol (MPD) 58%; the second component is thymol 30%; the scale inhibitor is hydroxyethylidene diphosphonic acid 1.5%; the pH buffer is disodium hydrogen phosphate 7.5%; the colorant is fluorescent green 2%; the defoamer is polyether modified silicon defoamer 1%; after mixing the components in proportion, heating at 100℃, stirring for 8 hours, and dissolving, the result is obtained. This ultra-low temperature resistant MPD-based antifreeze liquid has the properties of anti-corrosion and scale inhibition, -72℃ low temperature antifreeze, 140℃ high temperature tolerance, and non-flammable and explosion-resistant, and can be used in extreme weather conditions.

[0071] Example 8

[0072] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0073] The first component is 2-methyl-1,3-propanediol (MPD) 18%; the second component is ammonium carbonate 70%; scale inhibitor and corrosion inhibitor polyacrylic acid

[0074] 1.6%; pH buffer potassium dihydrogen phosphate 5.5%; colorant phthalocyanine blue 4%; defoamer polyether modified silicon defoamer 0.9%; after mixing the components in proportion, heat at 60℃, stir for 0.8h, and dissolve to obtain the product. This ultra-low temperature resistant MPD-based antifreeze liquid has the properties of anti-corrosion and anti-scaling, -81℃ low temperature antifreeze, 95℃ high temperature tolerance, and non-flammable and explosion-resistant, and can be used in extreme weather conditions.

[0075] Example 9

[0076] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0077] The first component is 2-methyl-1,3-propanediol (MPD) 28%; the second component is methyl trioctyl ammonium chloride 58%; scale inhibitor and corrosion inhibitor polyacrylic acid

[0078] 1.5%; pH buffer potassium dihydrogen phosphate 9.5%; colorant fluorescent yellow 2.5%; defoamer polyether modified silicon defoamer 0.5%; after mixing the components in proportion, heat at 95℃, stir for 17h, and dissolve to obtain the product. This ultra-low temperature resistant MPD-based antifreeze liquid has the properties of anti-corrosion and anti-scaling, -125℃ low temperature antifreeze, 135℃ high temperature tolerance, and non-flammable and explosion-resistant, and can be used in extreme weather conditions.

[0079] Example 10

[0080] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0081] The first component is 2-methyl-1,3-propanediol (MPD) 38%; the second component is succinonitrile 50%; scale inhibitor and corrosion inhibitor polyacrylic acid

[0082] 1.1%; pH buffer potassium dihydrogen phosphate 7.0%; colorant methylene blue 2.0%, phthalocyanine blue 0.9%; defoamer polyether modified silicon defoamer 1%; after mixing the components in proportion, heat at 70℃, stir for 3h, and dissolve to obtain the product. This ultra-low temperature resistant MPD-based antifreeze liquid has the properties of anti-corrosion and anti-scaling, -77℃ low temperature antifreeze, 130℃ high temperature tolerance, and non-flammable and explosion-resistant, and can be used in extreme weather conditions.

[0083] Embodiment 11

[0084] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0085] The first component is 2-methyl-1,3-propanediol (MPD) 30%; the second component is methyl triphenyl phosphonium bromide 60%; scale inhibitor and corrosion inhibitor polyacrylic acid

[0086] 1.4%; pH buffer potassium dihydrogen phosphate 6.6%; colorant phenol red 1.2%; defoamer polyether modified silicon defoamer 0.8%; after mixing the components in proportion, heat at 110℃, stir for 11h, and dissolve to obtain the product. This ultra-low temperature resistant MPD-based antifreeze liquid has the properties of anti-corrosion and anti-scaling, -95℃ low temperature antifreeze, 100℃ high temperature tolerance, and non-flammable and explosion-resistant, and can be used in extreme weather conditions.

[0087] Example 12

[0088] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0089] The first component is 2-methyl-1,3-propanediol (MPD) 35%; the second component is ferric chloride 60%; scale inhibitor and corrosion inhibitor polyacrylic acid

[0090] 1.5%; pH buffer potassium dihydrogen phosphate 9.2%; colorant methyl red 3.0%, phenol red 0.7%; defoamer polyether modified silicon defoamer 0.6%; after mixing the components in proportion, heat at 75℃, stir for 1h, and dissolve to obtain the product. This ultra-low temperature resistant MPD-based antifreeze liquid has the properties of anti-corrosion and anti-scaling, -141℃ low temperature antifreeze, 125℃ high temperature tolerance, and non-flammable and explosion-resistant, and can be used in extreme weather conditions.

[0091] Example 13

[0092] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0093] The first component is 2-methyl-1,3-propanediol (MPD) 52%; the second component is isosorbide 32%; scale inhibitor polyacrylic acid 1.8%; pH buffer potassium dihydrogen phosphate 8.8%; colorant fluorescent yellow 4.7%; defoamer polyether modified silicon defoamer 0.7%; after mixing the components in proportion, heating at 85℃, stirring for 15h, and dissolving, the product is obtained. This ultra-low temperature resistant MPD-based antifreeze liquid has anti-corrosion and scale inhibition, low temperature antifreeze at -108℃, high temperature resistance at 110℃, and is not easy to ignite and explode, and can meet the requirements of use in extreme weather.

[0094] Embodiment 14

[0095] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0096] The first component is 2-methyl-1,3-propanediol (MPD) 72%; the second component is N,N-dimethylpropylene urea 13.8%; scale inhibitor polyacrylic acid 1%; pH buffer potassium dihydrogen phosphate 8%; colorant methylene blue 4.6%; defoamer polyether modified silicon defoamer 0.6%; after mixing the components in proportion, heating at 105℃, stirring for 20 hours, and dissolving, the product is obtained. This ultra-low temperature resistant MPD-based antifreeze liquid has anti-corrosion and scale inhibition, -85℃ low temperature antifreeze, 145℃ high temperature tolerance, and is not easy to ignite and explode, and can meet the requirements of use in extreme weather.

[0097] Embodiment 15

[0098] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0099] The first component is 2-methyl-1,3-propanediol (MPD) 60%; the second component is benzyl triphenylphosphonium chloride 28%; scale inhibitor and corrosion inhibitor polyacrylic acid

[0100] 1.8%; pH buffer potassium dihydrogen phosphate 7.2%; colorant fluorescent green 2.5%; defoamer polyether modified silicon defoamer 0.5%; after mixing the components in proportion, heat at 125℃, stir for 10 hours, and dissolve to obtain the product. This ultra-low temperature resistant MPD-based antifreeze liquid has the properties of anti-corrosion and anti-scaling, -134℃ low temperature antifreeze, 165℃ high temperature tolerance, and non-flammable and explosion-resistant, and can be used in extreme weather conditions.

[0101] Example 16

[0102] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0103] The first component is 2-methyl-1,3-propanediol (MPD) 68%; the second component is zinc chloride 20%; scale inhibitor and corrosion inhibitor polyacrylic acid

[0104] 1.3%; pH buffer potassium dihydrogen phosphate 7.7%; colorant lemon yellow 2.4%; defoamer polyether modified silicon defoamer 0.6%; after mixing the components in proportion, heat at 115℃, stir for 22 hours, and dissolve to obtain the product. This ultra-low temperature resistant MPD-based antifreeze liquid has the properties of anti-corrosion and anti-scaling, -86℃ low temperature antifreeze, 160℃ high temperature tolerance, and non-flammable and explosion-resistant, and can be used in extreme weather conditions.

[0105] Embodiment 17

[0106] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0107] The first component is 2-methyl-1,3-propanediol (MPD) 68%; the second component is zinc chloride 15%, benzyl triphenylphosphonium chloride 5%; scale inhibitor and corrosion inhibitor polyacrylic acid

[0108] 1.3%; pH buffer potassium dihydrogen phosphate 7.7%; colorant fluorescent yellow 1.0%, lemon yellow 1.4%; defoamer polyether modified silicon defoamer 0.6%; after mixing the components in proportion, heat at 115℃, stir for 12 hours, and dissolve to obtain the product. This ultra-low temperature resistant MPD-based antifreeze liquid has the properties of anti-corrosion and anti-scaling, -136℃ low temperature antifreeze, 132℃ high temperature tolerance, and non-flammable and explosion-resistant, and can be used in extreme weather conditions.

[0109] Embodiment 18

[0110] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0111] The first component is 2-methyl-1,3-propanediol (MPD) 68%; the second component is tetramethyl urea, N,N-dimethylpropylene urea, 20% isosorbide; scale inhibitor and corrosion inhibitor polyacrylic acid

[0112] 1.3%; pH buffer potassium dihydrogen phosphate 7.7%; colorant methyl red 0.4%, phenol red 2.0%; defoamer polyether modified silicon defoamer 0.4% polysiloxane defoamer 0.2%; after mixing the components in proportion, heat at 115℃, stir for 2h, and dissolve to obtain the product. This ultra-low temperature resistant MPD-based antifreeze liquid has anti-corrosion and anti-scaling properties, can prevent freezing at -126℃, can withstand high temperatures of 152℃, is not easy to burn and explode, and can meet the requirements of use in extreme weather.

[0113] Embodiment 19

[0114] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0115] The first component is 2-methyl-1,3-propanediol (MPD) 68%; the second component is tetramethyl urea 10%, succinonitrile 5%, N,N-dimethylpropylene urea 3%, benzyl triphenylphosphonium chloride 2%; scale inhibitors and corrosion inhibitors are zinc sulfate 0.5%, hydroxyethylidene diphosphonic acid 0.3%, aminotrimethylenephosphonic acid 0.2%, polyacrylic acid 0.2%, hydrolyzed polymaleic anhydride

[0116] 0.1%; pH buffer potassium dihydrogen phosphate 4%, sodium silicate 2.5%, sodium citrate 0.2%; colorant methylene blue 1.0%, methyl red 0.5%, phenol red 0.3%, phthalocyanine blue 0.8%, lemon yellow 0.2%, fluorescent yellow 0.3%, fluorescent green 0.3%; defoamer polyether modified silicon defoamer 0.6%; after mixing the components in proportion, heating at 115℃, stirring for 22h, dissolving, the product can be obtained. This ultra-low temperature resistant MPD-based antifreeze liquid has anti-corrosion and anti-scaling properties, antifreeze at -132℃, high temperature resistance of 97℃, and is not easy to burn and explode, which can meet the requirements of use in extreme weather.

[0117] Embodiment 20

[0118] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0119] The first component is 2-methyl-1,3-propanediol (MPD) 68%; the second component is methyl trioctyl ammonium bromide 8%, methyl trioctyl ammonium chloride 7%, methyl triphenyl phosphonium bromide 5%; scale inhibitor and corrosion inhibitor polyacrylic acid

[0120] 1.3%; pH buffer sodium borate 3.0%, sodium silicate 2.5%, sodium citrate 1.0%, citric acid 0.5%, tartaric acid 0.3%, phosphoric acid and disodium hydrogen phosphate 0.1%, potassium dihydrogen phosphate 0.3%; colorant lemon yellow 0.5%, fluorescent yellow 0.5%, fluorescent green 1.4%; defoamer polyether modified silicon defoamer 0.6%; after mixing the components in proportion, heating at 115℃, stirring for 9h, dissolving, the product can be obtained. This ultra-low temperature resistant MPD-based antifreeze has anti-corrosion and anti-scaling properties, antifreeze at -89℃, high temperature resistance of 133℃, and is not easy to burn and explode, which can meet the requirements of extreme weather use.

[0121] Embodiment 21

[0122] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0123] The first component is 2-methyl-1,3-propanediol (MPD) 38%; the second component is choline chloride 35%, zinc chloride 10%, tetraethylammonium chloride 5%; scale inhibitor and corrosion inhibitor hydroxyethylidene diphosphonic acid 0.6%, aminotrimethylphosphonic acid

[0124] 0.5%; pH buffer potassium dihydrogen phosphate 7.0%; colorant lemon yellow 2.0%, fluorescent green 0.9%; defoamer high carbon alcohol defoamer 0.8%, polyether modified silicon defoamer 0.2%; after mixing the components in proportion, heating at 70℃, stirring for 6 hours, dissolving to obtain. This ultra-low temperature resistant MPD-based antifreeze liquid has the properties of anti-corrosion and anti-scaling, -91℃ low temperature antifreeze, 93℃ high temperature tolerance, non-flammable and explosion-resistant, and can be used in extreme weather.

[0125] Embodiment 22

[0126] A type of MPD-based antifreeze formulation is composed of the following ingredients mixed in mass ratio:

[0127] The first component is 2-methyl-1,3-propanediol (MPD) 30%; the second component is menthol 30%, isosorbide 20%, thymol 10%; scale inhibitor and corrosion inhibitor polyacrylic acid 1.2%, hydrolyzed polymaleic anhydride

[0128] 0.2%; pH buffer 5% phosphoric acid, 1.2% disodium hydrogen phosphate, 0.4% potassium dihydrogen phosphate; colorant fluorescent green 1.1%, fluorescent yellow 0.1%; defoamer organosilicon defoamer 0.6%, polysiloxane defoamer 0.2%; after mixing the components in proportion, heating at 110℃, stirring for 13h, dissolving to obtain the product. This ultra-low temperature resistant MPD-based antifreeze liquid has anti-corrosion and anti-scaling properties, can prevent freezing at -103℃, can withstand high temperatures of 114℃, is not easy to ignite and explode, and can meet the requirements of use in extreme weather.

[0129] In summary, the antifreeze based on 2-methyl-1,3-propanediol (MPD) has the properties of high efficiency anti-corrosion and anti-scaling, low temperature antifreeze and non-flammable and explosion-resistant, and can be used under extreme low temperature conditions.

[0130] The above are only preferred embodiments of the present invention and are not limitations of the present invention. The present invention is not limited to the above examples. Other technicians may make equivalent structures or equivalent process conversions within the framework of the present invention, or directly or indirectly apply them to other related fields, which should all fall within the protection scope of the present invention.

[0131] Summary table of thermal decomposition temperature and freezing point

[0132]

[0133]

[0134] Antifreeze based on 2-methyl-1,3-propanediol (MPD) is not easy to volatilize, and its thermal decomposition temperature is above 95°C. It can ensure the original concentration of each component of the antifreeze for a long time, does not require additional supplementation, is not easy to ignite or explode, and can keep the antifreeze from freezing at temperatures of -60°C and below, meeting the requirements for use in extreme weather conditions.

[0135] The technical solutions disclosed and proposed by the present invention can be realized by those skilled in the art by referring to the contents of this article and appropriately changing the conditions, routes and other links. Although the methods and preparation techniques of the present invention have been described through preferred embodiments, relevant technicians can obviously modify or re-combine the methods and technical routes described herein without departing from the content, spirit and scope of the present invention to realize the final preparation technology. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art, and they are all considered to be included in the spirit, scope and content of the present invention.

Claims

1. A type of antifreeze liquid based on 2-methyl-1,3-propanediol, characterized in that: The antifreeze formula, components and mass ratio are as follows: The first component 2-methyl-1,3-propanediol (MPD) 10% to 80%; The second component is 10% to 80% of hydrogen bond acceptor compound; Scale and corrosion inhibitor 0.5% to 2%; pH buffer 5% to 10%; Colorant 2% to 5%; Defoaming agent 0.5%~1%.

2. The antifreeze solution based on 2-methyl-1,3-propanediol as claimed in claim 1, characterized in that: The second component hydrogen bond acceptor compound is selected from any one or more of choline chloride, zinc chloride, methyl trioctyl ammonium bromide, zirconium dichloride, methyl trioctyl ammonium chloride, ferric chloride, ammonium carbonate, methyl triphenyl phosphonium bromide, menthol, isosorbide, thymol, tetraethylammonium chloride, tetramethyl urea, succinonitrile, N,N-dimethylpropylene urea, benzyl triphenyl phosphonium chloride, etc.

3. The antifreeze solution based on 2-methyl-1,3-propanediol as claimed in claim 1, characterized in that: The scale inhibitor and corrosion inhibitor is one or more of zinc sulfate, hydroxyethylidene diphosphonic acid, aminotrimethylphosphonic acid, polyacrylic acid, and hydrolyzed polymaleic anhydride.

4. The antifreeze solution based on 2-methyl-1,3-propanediol (MPD) as claimed in claim 1, characterized in that: The pH buffer is one or more of sodium borate, sodium silicate, sodium citrate, citric acid, tartaric acid, phosphoric acid, disodium hydrogen phosphate, and potassium dihydrogen phosphate.

5. The antifreeze solution based on 2-methyl-1,3-propanediol as claimed in claim 1, characterized in that: The colorant is one or more of methylene blue, methyl red, phenol red, phthalocyanine blue, lemon yellow, fluorescent yellow and fluorescent green.

6. The antifreeze solution based on 2-methyl-1,3-propanediol as claimed in claim 1, characterized in that: The defoaming agent is one or more of a higher alcohol defoaming agent, an organosilicon defoaming agent, a polysiloxane defoaming agent, a polyether modified silicon defoaming agent, and a powder defoaming agent.

7. The method for preparing an antifreeze solution based on 2-methyl-1,3-propanediol according to claim 1, characterized in that: After mixing the components in proportion, heating at 30°C to 150°C and stirring for 0.1h to 24h, the mixture is dissolved.

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