Anti-freezing solution as well as preparation method and application thereof

Abstract

The invention relates to an anti-freezing solution as well as a preparation method and application thereof. The anti-freezing solution comprises glycerol dimethyl ether and water, wherein the mass percentage of the glycerol dimethyl ether is 1-80wt%; the glycerol dimethyl ether comprises at least one of 1, 3-dimethoxy-2-propyl alcohol and 2, 3-dimethoxy-1-propyl alcohol, and the glycerol dimethyl ether comprises at least one of 1, 3-dimethoxy-2-propyl alcohol and 2, 3-dimethoxy-1-propyl alcohol; and the effect of transporting granular goods for train open wagons or containers in winter is excellent. The anti-freezing fluid has excellent anti-freezing performance, and the freezing point of the anti-freezing fluid can be obviously reduced. Meanwhile, the anti-freezing solution has good environmental protection property and biodegradability, and the defects of traditional anti-freezing solution components in the aspects of environmental pollution and health safety are overcome.

Description

Technical Field

[0001] The present invention relates to the field of antifreeze liquid preparation, and in particular to an antifreeze liquid and a preparation method and application thereof. Background Art

[0002] In recent years, the global demand for environmental protection and sustainable development has continued to increase, and the antifreeze technology for transporting granular cargoes has also faced higher standards. The hydrophobic antifreeze described in patent CN118772845A is composed of ethylene glycol, dimethyl silicone oil, n-pentane and other surfactants. The antifreeze described in patent CN115746797A uses water, sodium carboxymethyl cellulose, ethylene glycol, sodium citrate, Tween 80 emulsifier, microcrystalline cellulose powder, sodium barbital, calcium chloride, hexamethylenetetramine, triethanolamine, etc. Patent CN111423850B uses anhydrous calcium chloride, magnesium aluminum silicate organic modified bentonite, sodium nitrite, pregelatinized starch, antirust lubricating oil, corrosion inhibitor, sodium pyrophosphate, sodium hydroxide, etc. Patent CN118496815A uses at least one of ethylene glycol bis-2-aminoethyl ether and ethylene glycol bis-(3-aminopropyl) ether, molasses and pH regulators. It can be found that the existing traditional organic antifreeze usually uses chemical substances such as calcium chloride, ethylene glycol, propylene glycol and glycerol as the main ingredients. Although these compounds have good antifreeze performance, they also need to be compounded with many other types of compounds. There are certain limitations in terms of environmental protection, degradability and safety to human health. Therefore, finding new, environmentally friendly and efficient antifreeze ingredients has become one of the important research directions. Summary of the invention

[0003] The purpose of the present invention is to provide an antifreeze solution and its preparation method and application in view of the limitations of the current technology. The antifreeze solution includes two substances, water and dimethyl glycerol. Other components can be added as appropriate according to the actual situation. However, it has been found in practice that mainly using dimethyl glycerol can achieve a good antifreeze effect, especially in the antifreeze of granular cargo transportation, which has a good application value.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: An antifreeze solution comprising glycerol dimethyl ether and water; Wherein, the mass percentage of glycerol dimethyl ether is 1-80wt%; preferably 30-70wt%.

[0005] The glycerol dimethyl ether includes at least one of 1,3-dimethoxy-2-propanol and 2,3-dimethoxy-1-propanol.

[0006] Preferably, there are two kinds of alcohol, and the mass ratio of 1,3-dimethoxy-2-propanol to 2,3-dimethoxy-1-propanol is (1-5):1.

[0007] The present invention provides a method for preparing the antifreeze solution, which mainly comprises the following steps: Mix water and dimethyl glycerol and stir to obtain the product.

[0008] The antifreeze liquid is preferably used for transporting granular cargo in open train cars or containers in winter.

[0009] The granular cargo is coal, metal ore powder or granules.

[0010] The preparation method of the invention is simple to operate, and the prepared antifreeze liquid has a good antifreeze effect.

[0011] In summary, the present invention proposes a novel antifreeze formula with dimethyl glycerol as the main component. After dimethyl glycerol is mixed with water, it has excellent antifreeze performance and can significantly reduce the freezing point of the antifreeze itself. At the same time, the antifreeze has good environmental protection and biodegradability, and solves the shortcomings of traditional antifreeze components in environmental pollution and health and safety. By optimizing the use ratio of dimethyl glycerol to water, and optimizing the ratio between the various components of dimethyl glycerol, the efficiency of the antifreeze can be improved, the impact on the environment can be reduced, and a safer and greener antifreeze solution can be provided for the transportation of granular cargo in cold winter climates.

[0012] The essential features of the present invention are: The present invention adopts glycerol dimethyl ether and water for compounding, and glycerol dimethyl ether can form interactions with water; these interactions can break the hydrogen bonds between water molecules, making it more difficult for water molecules to form solid ice crystal structures, thereby lowering the freezing point.

[0013] The present invention selects glycerol dimethyl ether (GDE) as the component of the antifreeze liquid. In addition to having good antifreeze ability, glycerol dimethyl ether has good biodegradability and has less impact on the environment and human body compared with traditional antifreeze liquid components. Therefore, the development of antifreeze liquid with glycerol dimethyl ether as the main component can effectively improve the shortcomings of existing antifreeze technology and meet the market demand for green chemicals.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) The antifreeze liquid of the present invention has a simple formula and is mainly composed of two substances, water and dimethyl glycerol. Other ingredients can be added as appropriate according to the actual situation. However, it has been found in practice that mainly using dimethyl glycerol can achieve a good antifreeze effect, especially in the antifreeze of granular cargo transportation, which has a good application value.

[0015] (2) The steps for preparing the antifreeze solution of the present invention are simple to operate, the previous and subsequent steps are closely connected, and the prepared antifreeze solution is green and environmentally friendly.

[0016] (3) The antifreeze prepared by the present invention has a good application in the antifreeze of granular cargo transportation. The antifreeze can prevent the freezing between the granular cargo and the transport box and between the granular cargo itself, and has the best antifreeze effect on granular cargo. Because the granular cargo itself is relatively large in volume, it needs stability and high durability, as well as high antifreeze efficiency and antifreeze effect that can quickly respond to the requirements. Therefore, the general antifreeze has a good antifreeze effect but low antifreeze durability, low efficiency and poor environmental protection effect, so it is not very suitable. The antifreeze of the present invention is a safe, green and environmentally friendly antifreeze, which complies with the railway industry standard of the People's Republic of China (TB3208-2023) and is more advantageous than the existing antifreeze in the market. DETAILED DESCRIPTION

[0017] The embodiments of the present invention will be described in detail below in conjunction with the examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention. If specific conditions are not specified in the examples, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0018] In the following examples, 1,3-dimethoxy-2-propanol was obtained from commercial sources, and 2,3-dimethoxy-1-propanol was prepared using the patent method of application number 201210290421.3, but the invention is not limited thereto.

[0019] Example 1 The preparation method of antifreeze is as follows: Mix 80kg of 1,3-dimethoxy-2-propanol and 20kg of water, and the sample is a homogeneous phase. The freezing point of the antifreeze is -57℃. When tested at -50℃, it shows excellent antifreeze performance and stability. The freezing point test uses the automatic freezing point tester (A6020) of Delite (Beijing) Technology Co., Ltd. and is tested in accordance with the requirements of the Railway Industry Standard of the People's Republic of China (TB3208-2023).

[0020] After 30 days, the freezing point remained unchanged when measured again.

[0021] Example 2 The specific implementation steps are consistent with those in Example 1, except that 1 kg of 1,3-dimethoxy-2-propanol is mixed with 99 kg of water, and its freezing point is tested to be -55°C. The testing method is consistent with that in Example 1.

[0022] Example 3 The specific implementation steps are consistent with those in Example 1, except that 50 kg of 1,3-dimethoxy-2-propanol and 50 kg of water are mixed, and the freezing point thereof is tested to be -60°C. The testing method is consistent with that in Example 1.

[0023] Example 4 The specific implementation steps are consistent with those in Example 1, except that 25 kg of 1,3-dimethoxy-2-propanol, 25 kg of 2,3-dimethoxy-1-propanol and 50 kg of water are mixed, and the freezing point thereof is tested to be -65°C. The testing method is consistent with that in Example 1.

[0024] Example 5 The specific implementation steps are consistent with those in Example 1, except that 40 kg of 1,3-dimethoxy-2-propanol, 8 kg of 2,3-dimethoxy-1-propanol and 52 kg of water are mixed, and the freezing point thereof is tested to be -63°C. The testing method is consistent with that in Example 1.

[0025] Example 6 The specific implementation steps are consistent with those in Example 1, except that 30 kg of 1,3-dimethoxy-2-propanol, 15 kg of 2,3-dimethoxy-1-propanol and 55 kg of water are mixed, and the freezing point thereof is tested to be -64°C. The testing method is consistent with that in Example 1.

[0026] Test Example 1 The performance test of the antifreeze solution in each of the above embodiments is carried out, and the specific test results are shown in Table 1 below:

[0027] The test is carried out in accordance with the railway industry standard of the People's Republic of China (TB3208-2023) - Testing standards for antifreeze in railway bulk granular cargo transportation.

[0028] It can be seen from the test results in Table 1 above that when two types of dimethyl glycerol are mixed in a mass ratio of 1:1, the performance of the antifreeze is the best.

[0029] Application Example 1 A 20-foot container was selected, 30 L of the antifreeze solution obtained in Example 3 was sprayed on its inner wall at -30°C, and then metallic chromium powder was loaded. After 150 hours of railway transportation, no freezing occurred between the granular cargo and the transport box or between the granular cargo itself.

[0030] This indicates that the resulting antifreeze is effective in extremely cold weather.

[0031] Although the present invention has been illustrated and described with specific embodiments, it will be appreciated that many other changes and modifications may be made without departing from the spirit and scope of the present invention. Therefore, it is intended to include all such changes and modifications within the scope of the present invention in the appended claims.

[0032] Matters not covered by the present invention are known technologies.

Claims

1. An antifreeze solution, characterized in that the antifreeze solution comprises glycerol dimethyl ether and water; in, The mass percentage of glycerol dimethyl ether is 1-80wt%, The glycerol dimethyl ether includes at least one of 1,3-dimethoxy-2-propanol and 2,3-dimethoxy-1-propanol.

2. The antifreeze solution according to claim 1, characterized in that Glycerol dimethyl ether is composed of 1,3-dimethoxy-2-propanol and 2,3-dimethoxy-1-propanol, with a mass ratio of (1-5):

1.

3. The antifreeze liquid as claimed in claim 1, characterized in that the mass percentage of dimethyl glycerol in the antifreeze liquid is 30-70wt%.

4. The method for preparing the antifreeze solution according to claim 1, characterized in that The method comprises the following steps: mixing water and glycerol dimethyl ether and stirring.

5. The use of the antifreeze liquid as claimed in claim 1, characterized in that it is used for transporting granular goods in open train cars or containers in winter.

6. The use as claimed in claim 5, characterized in that the granular cargo is coal, metal ore powder or granules.

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