Snow-melting dust-suppression type self-heating snow-melting agent

Abstract

The invention provides a snow-melting dust-suppression type self-heating snow-melting agent. The snow-melting dust-suppression type self-heating snow-melting agent comprises the following components in parts by mass: 2-50 parts of sodium chloride, 2-40 parts of magnesium chloride, 10-90 parts of calcium chloride, 0-10 parts of potassium chloride, 0.1-20 parts of a corrosion inhibitor and 0-80 parts of water. The snow-melting and dust-suppression type self-heating snow-melting agent disclosed by the invention is environment-friendly, high in ice-melting speed, good in moisturizing effect and free from icing, and has a good dust-suppression effect.

Description

Technical Field

[0001] The invention belongs to the technical field of snow melting and deicing, and in particular relates to a snow melting and dust suppression type self-heating snow melting agent. Background Art

[0002] Snow melting agent is a chemical substance used to melt snow and ice during winter snowfall. It has been widely used for its advantages of simple operation, low cost, fast deicing speed and good effect. Chloride-type snow melting agent with sodium chloride as the main component in snow melting agent is difficult to be replaced by other products because of its large reserves, low price and good snow melting effect, but such snow melting agent has potential harm to the environment, so people have begun to develop various snow melting agents with other alternative ingredients and various environmentally friendly corrosion inhibitors, and have achieved good results. However, the current snow melting agent still has the problem of poor ice melting rate and long required ice melting cycle, which cannot meet the occasions where rapid ice melting is required. In addition, the existing snow melting agent has poor moisturizing effect. When the road is cleaned after snow melting, it is easy to be dusty and dust suppression is required. In winter, the road surface is easy to freeze when water is sprinkled, which brings hidden dangers to pedestrians and vehicle traffic safety. Therefore, it is a problem that those skilled in the art need to solve to develop an environmentally friendly snow melting agent with fast ice melting rate, good moisturizing effect and dust suppression effect. Summary of the invention

[0003] In view of this, in order to solve the above technical problems, the present invention proposes a self-heating snow-melting and dust-suppressing snow-melting agent which is environmentally friendly, has a fast ice-melting rate, has a good moisturizing effect and does not freeze.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A snow-melting and dust-suppressing self-heating snow-melting agent, characterized in that it comprises the following components in parts by mass: 2-50 parts of sodium chloride, 2-40 parts of magnesium chloride, 10-90 parts of calcium chloride, 0-10 parts of potassium chloride, 0.1-20 parts of corrosion inhibitor, and 0-80 parts of water.

[0006] Furthermore, 10-30 parts of sodium chloride, 5-15 parts of magnesium chloride, 50-80 parts of calcium chloride, 1-7 parts of potassium chloride, 1-10 parts of corrosion inhibitor, and 1-60 parts of water.

[0007] Furthermore, the corrosion inhibitor includes amino acid, thiourea, sodium silicate, sodium hexametaphosphate, sodium gluconate, and trisodium citrate.

[0008] Furthermore, the amino acid is polyglutamic acid and / or polylysine.

[0009] Furthermore, the mass fractions of the components in the corrosion inhibitor are as follows: 5-20 parts of amino acid, 1-15 parts of thiourea, 5-40 parts of sodium silicate, 2-30 parts of sodium hexametaphosphate, 10-60 parts of sodium gluconate, and 0.01-12 parts of trisodium citrate.

[0010] Furthermore, the mass fractions of the components in the corrosion inhibitor are as follows: 5-10 parts of amino acid, 10-15 parts of thiourea, 5-10 parts of sodium silicate, 15-30 parts of sodium hexametaphosphate, 20-40 parts of sodium gluconate, and 8-12 parts of trisodium citrate.

[0011] Among them, the purpose of adding corrosion inhibitors is to reduce the impact of snow melting agents on the surrounding environment. The working principle of corrosion inhibitors is: through the action with metals (including physical adsorption and chemical adsorption), the occurrence of metal corrosion is inhibited. There are three main mechanisms of action. The first is adsorption-type corrosion inhibition. This type of corrosion inhibition is due to the presence of polar groups in the corrosion inhibitor molecules, which can be adsorbed on the surface of metal materials to form a film, hindering the contact between the corrosive medium and the metal material; the second is precipitation-type corrosion inhibition. This type of corrosion inhibition is that after the corrosion inhibitor molecules react with other ions in the corrosive environment, insoluble substances are produced and deposited on the surface of the metal material, thereby protecting the metal; the third is oxidation-type corrosion inhibition. This type of corrosion inhibition uses the strong oxidizing property of the corrosion inhibitor to form a passivated film on the surface of the metal substrate to prevent the corrosion reaction from proceeding. The corrosion inhibition effect of amino acid corrosion inhibitors on metals in corrosive media is mainly due to the lone pair electrons on S and N in the amino acid molecules forming surface complexes with the Fe empty orbits and adsorbing to the surface of carbon steel, forming a dense adsorption film that effectively prevents metal corrosion and greatly reduces its corrosion rate.

[0012] Compared with the prior art, the snow-melting and dust-suppressing self-heating snow-melting agent of the present invention has the following advantages:

[0013] (1) The snow-melting and dust-suppressing self-heating snow-melting agent of the present invention is compounded with a variety of chloride salt compounds, and can generate heat by itself after dissolving in water, which greatly improves the ice-melting rate and shortens the ice-melting cycle, and is suitable for occasions where rapid ice melting is required;

[0014] (2) The snow-melting and dust-suppressing self-heating snow-melting agent of the present invention has a good moisturizing effect, is not easy to dry and does not freeze, and can keep the road surface moist. When performing road cleaning operations in winter, it can replace watering, keep the road surface moist for a long time and not freeze, and has a good dust suppression effect;

[0015] (3) The snow-melting and dust-suppressing self-heating snow-melting agent of the present invention is added with a corrosion inhibitor, which not only reduces the corrosion rate of the snow-melting agent, but also contains compounds that can be used as potassium fertilizer and nitrogen fertilizer, which can be used as nutrient fertilizer for plants, reducing damage to green plants. At the same time, amino acids are easily degraded, reducing pollution to the environment, and are more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a comparison chart of the test results of spraying different types of snow-melting agents. DETAILED DESCRIPTION

[0017] Unless otherwise defined, the technical terms used in the following examples have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods, unless otherwise specified, are all conventional methods.

[0018] The present invention will be described in detail below with reference to the embodiments and the accompanying drawings.

[0019] 1. Formulas of Deicing Agents in Examples and Comparative Examples

[0020] Table 1 lists the distribution ratios of each group of deicing agents of Examples 1 to 5 and Comparative Example 1, wherein the values ​​are in parts by mass; the distribution ratios of each group of Comparative Example 2 are listed separately.

[0021] Table 1

[0022]

[0023]

[0024] Among them, the composition of the corrosion inhibitor in Examples 1-6 is: 30 parts of sodium gluconate, 30 parts of sodium hexametaphosphate, 12 parts of trisodium citrate, 14 parts of thiourea, 5 parts of sodium silicate, and 9 parts of amino acids; and the amino acid in Examples 1-5 is polyglutamic acid, and the amino acid in Example 6 is polylysine.

[0025] In Comparative Example 2, the composition of the deicing agent is 75 parts of potassium acetate, 8 parts of potassium formate, 7 parts of calcium magnesium acetate, 3 parts of sodium gluconate, 3 parts of thiourea, 2 parts of sodium silicate, 1 part of amino acid, and 1 part of water.

[0026] 2. Performance test of the deicing agents of Examples 1 to 6 and Comparative Examples 1 and 2

[0027] 2-1. Metal carbon steel corrosion test:

[0028] The corrosion test of metal carbon steel was carried out according to the rotating coupon method of DB11 / T 161-2012. Eight rectangular No. 20 test metal carbon steel sheets (GB / T 699) were taken, with a size of 5 mm × 2.5 mm × 0.2 mm and a surface area of ​​28 mm. 2 , wipe off the grease on the surface of the test metal carbon steel with filter paper, soak it in acetone and anhydrous ethanol, then dry and weigh it;

[0029] After weighing the samples with a balance, 8 metal carbon steel sheets were immersed in the deicing agents of Examples 1-6 and Comparative Examples 1 and 2 respectively. The ratio of solution volume to sample area was 25 ml / cm 2 The test temperature was 40℃, and no air was introduced during the experiment. After immersion for 48 hours, the rust on the surface of the sample was wiped off, and then the sample was washed with acid, alkali, and pure water, and then the excess water was removed with anhydrous ethanol, and then it was dried and weighed; another blank metal carbon steel sheet was not treated with snow melting agent corrosion, and after acid, alkali, and pure water washing, the excess water was removed with anhydrous ethanol, and then it was dried and weighed;

[0030] The corrosion rate is determined based on the corrosion loss. The corrosion rate X is calculated as follows:

[0031] X=8760×(m-m1)×10 / (s×ρ×t)

[0032] Where: m is the mass loss of the sample, g;

[0033] m1 is the mass loss of a blank carbon steel sheet that has not been treated with deicing agent corrosion after being subjected to corresponding acid washing, alkali washing, and pure water washing, g;

[0034] s is the surface area of ​​the sample, cm 2 ;

[0035] ρ is the density of the sample, g / cm 3 ;

[0036] t is the experimental time, h;

[0037] 8760 is the number of hours equivalent to one year, h / a;

[0038] 10 is the number of millimeters equivalent to 1 cm, mm / cm.

[0039] The corrosion rate results of the deicing agents of Examples 1-6 and Comparative Examples 1 and 2 on metal carbon steel sheets are shown in Table 2.

[0040] 2-2. Ice melting ability test:

[0041] According to the national standard GB 23851-2017 for road deicing and snow-melting agents, an experiment to measure the snow-melting ability of the snow-melting agent was carried out.

[0042] Test method: 100 mL of water is added to 8 150 mL beakers, and the deicing agent solutions in Examples 1-6 and Comparative Examples 1 and 2 are placed in a low temperature thermostat at -10°C. After 3 hours, the beakers with ice cubes are taken out from the low temperature thermostat, and the masses of the beakers and ice cubes are quickly weighed. Then, the deicing agent solutions in Examples 1-6 and Comparative Examples 1 and 2 in the low temperature thermostat are respectively poured into the ice cubes in the previous beakers. After 30 minutes, the beakers are taken out, the liquid is poured out, and the masses of the remaining ice cubes and the beakers are quickly weighed. The difference between the mass of the beaker and the ice before and after the deicing agent solution is poured is the amount of ice melting. A blank case is set up, in which only sodium chloride is added as a deicing agent, and its deicing capacity is defined as 100%.

[0043] The test results of ice melting ability in Examples 1-6 and Comparative Examples 1 and 2 are shown in Table 2.

[0044] 2-3. Freezing point test:

[0045] In a temperature environment below the freezing point, a thermometer was inserted into the deicing agent of Examples 1-6 and Comparative Examples 1 and 2, and the temperature change over time was recorded. A temperature-time curve was drawn, and the temperature corresponding to the flat part of the curve was the freezing point temperature of the deicing agent.

[0046] The freezing point test results in Examples 1-6 and Comparative Examples 1 and 2 are shown in Table 2.

[0047] 2-4. Ice melting rate test:

[0048] Test method: add 100 mL of water to 8 150 mL beakers, place them in a low temperature thermostat at -10°C until they are frozen, weigh the masses of the beakers and ice cubes, and set aside after 3 hours; then dissolve the deicing agents in Examples 1-6 and Comparative Examples 1 and 2, and quickly pour them into the ice cubes in the previous beakers, take out the beakers after 15 minutes, pour out the liquid, and quickly weigh the masses of the remaining ice cubes and beakers. The mass difference between the beaker and the ice before and after pouring the deicing agent is the ice melting rate, and the unit is g / 15min.

[0049] The test results of ice melting rates in Examples 1-6 and Comparative Examples 1 and 2 are shown in Table 2.

[0050] Table 2

[0051]

[0052] As can be seen from Table 2, in the compounded chloride salts of Examples 1-6, the ice melting rate is significantly improved due to the compounding of multiple self-heating substances; at the same time, due to the different contents of potassium chloride, as the potassium chloride content increases, its freezing point, ice melting capacity, ice melting amount, and ice melting rate all show an upward state; compared with Comparative Example 1, each performance index of Examples 1-6 has significant advantages; compared with Comparative Example 2, since Comparative Example 2 is a low-temperature environmentally friendly snow melting agent, its freezing point is low and the corrosion rate is low, but except for the freezing point and corrosion rate data, the ice melting rate of Examples 1-6 has obvious advantages, and is suitable for occasions where rapid ice melting is required;

[0053] It can be seen from Table 2 that the addition of corrosion inhibitors in Examples 1-6 can significantly slow down the metal corrosion rate compared to Comparative Example 1 in which no corrosion inhibitor is added, among which the metal corrosion rate data of Example 4 is the best.

[0054] 2-5. Moisturizing effect test:

[0055] Test method: Select three test samples: the deicing agent prepared in Example 5, a commercially available sodium chloride + calcium chloride deicing agent (sodium chloride content 8wt5% + calcium chloride 15wt%), and a commercially available sodium chloride deicing agent (sodium chloride content 98wt%-99wt%), and prepare them into 2kg spray liquid respectively;

[0056] Take three asphalt pavement pieces of the same size of 1.5m×1.5m, ①, ②, ③, and evenly spray the three prepared deicing agent solutions on them in turn, ① is the deicing agent of Example 5 with a concentration of 25%, ② is the deicing agent of sodium chloride + calcium chloride type with a concentration of 25%, and ③ is the deicing agent of sodium chloride type with a concentration of 25%;

[0057] Test duration: 6 hours from the time the solution is sprayed. Figure 1 As shown: Plot ① remained moist without whitening; Plot ② began to turn white 1 hour after spraying, and the road surface remained approximately 50% wetness after 3 hours, with obvious whitening; and the road surface remained approximately 20% wetness after 6 hours, with obvious whitening; Plot ③ began to turn white half an hour after spraying, and the road surface remained approximately 50% wetness after 2 hours, with obvious whitening; and the road surface wetness was basically 0 after 6 hours, with severe whitening.

[0058] Sample No. ① has the longest moisturizing time and does not turn white, and has the best dust suppression and moisturizing effect.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A snow-melting and dust-suppressing self-heating snow-melting agent, characterized in that: The invention comprises the following components in parts by mass: 2-50 parts of sodium chloride, 2-40 parts of magnesium chloride, 10-90 parts of calcium chloride, 0-10 parts of potassium chloride, 0.1-20 parts of corrosion inhibitor and 0-80 parts of water.

2. The snow-melting and dust-suppressing self-heating snow-melting agent according to claim 1, characterized in that: The invention comprises the following components in parts by mass: 10-30 parts of sodium chloride, 5-15 parts of magnesium chloride, 50-80 parts of calcium chloride, 1-7 parts of potassium chloride, 1-10 parts of corrosion inhibitor and 1-60 parts of water.

3. The snow-melting and dust-suppressing self-heating snow-melting agent according to claim 1, characterized in that: The corrosion inhibitors include amino acids, thiourea, sodium silicate, sodium hexametaphosphate, sodium gluconate and trisodium citrate.

4. The snow-melting and dust-suppressing self-heating snow-melting agent according to claim 3, characterized in that: The amino acids are polyglutamic acid and / or polylysine.

5. The snow-melting and dust-suppressing self-heating snow-melting agent according to claim 3, characterized in that: The mass proportions of the components in the corrosion inhibitor are as follows: 5-20 parts of amino acid, 1-15 parts of thiourea, 5-40 parts of sodium silicate, 2-30 parts of sodium hexametaphosphate, 10-60 parts of sodium gluconate, and 0.01-12 parts of trisodium citrate.

6. The snow-melting and dust-suppressing self-heating snow-melting agent according to claim 5, characterized in that: The mass proportions of the components in the corrosion inhibitor are as follows: 5-10 parts of amino acid, 10-15 parts of thiourea, 5-10 parts of sodium silicate, 15-30 parts of sodium hexametaphosphate, 20-40 parts of sodium gluconate, and 8-12 parts of trisodium citrate.

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