CN108485604B - Environment-friendly and non-corrosive road snow melting agent - Google Patents

Abstract

The invention discloses an environment-friendly and non-corrosive road snow-melting agent, which consists of the following raw materials in parts by weight, 10-50 parts of potassium carbonate and 5-20 parts of urea,5-30 parts of 1, 3-propanediol. The snow melting agent can be sprayed on the road surface in advance before ice and snow arrive, so that the freezing point of ice and snow on the road is effectively delayed; the snow melting agent provided by the invention directly melts ice and snow in a pre-wetting mode, so that the snow melting time is shortened; the snow-melting agent takes potassium carbonate inorganic salt as a main snow-melting component, and does not contain Cl of corrosive metal^‑The corrosion of the snow-melting agent to metal and concrete is effectively prevented; the snow melting agent has a low freezing point, ensures that ice and snow are melted and then flow away in liquid water so as not to freeze on a road, and ensures the driving safety.

Description

An environmentally friendly and non-corrosive road snow melting agent

technical field

The invention relates to a snow-melting agent, in particular to a road snow-melting agent with environmental protection and non-corrosiveness.

Background technique

In recent years, due to the continuous deterioration of the environment, snowfall and road icing have occurred frequently in winter, which have become the biggest "black spots" that cause serious traffic congestion in the city and cause road traffic accidents. Especially viaducts and overpasses, in cold rain and snow weather, because the bridge deck is water or suspended, the temperature is usually lower than the road, so it is more likely to cause the bridge deck to freeze, significantly reduce the road friction coefficient, and easily cause road traffic. ACCIDENT.

Complex weather conditions have seriously affected the road conditions. Snow, frost, thin ice, etc. occur from time to time, bringing huge risks to vehicles, not only seriously affecting the smooth traffic in the city, but also affecting driving safety, and even causing national damage. Serious loss of property and people's life and property. Therefore, adopting advanced technical means to realize active anti-icing and dust removal, and ensure the traffic safety in the city under severe snow and ice weather, especially to ensure the traffic safety and smooth flow of key nodes such as overpasses, viaducts and ramps in the city, has become a reality that urgently needs to be solved. question. At present, the snow melting and deicing measures used for highways, airport runways, bridges and urban roads mainly include mechanical snow removal, artificial snow removal and snow melting agent snow removal. Due to the lack of large-scale snow removal equipment, mechanical snow removal has low snow removal speed and efficiency. During manual snow removal, safety accidents often occur, and at the same time, the labor intensity is high, which affects the order and speed of traffic operation. Therefore, domestic and foreign countries often choose snow-melting agents that save time, effort, and reduce accidental injuries.

Snow melting agent, as the name suggests, its function is to melt snow and ice, mainly used in winter airports, highways, squares, parking railways, city streets, etc. At present, the snow-melting agents used in our country are inorganic snow-melting agents with "chlorine salt" as the main component, such as sodium chloride, calcium chloride, magnesium chloride, potassium chloride, etc. Its advantage is that the price is cheap, which is only 1/10 of that of organic snowmelting agents, but its corrosion to large-scale public infrastructure is very serious. Our common snow melting agent belongs to this category, and the most used is sodium chloride (that is, industrial salt). Another type of organic snow melting agent is potassium acetate as the main component. This kind of snow melting agent has good snow melting effect and basically no corrosion damage, but its price is too high, and it is generally used in important places such as airports.

The use of solid snow-melting agent also has disadvantages, mainly in the following aspects: First, when the solid snow-melting agent is spread, the road surface is slippery, and the waste caused by popping off the road and splashing into the shoulder of the road is huge; second, the dry snow-melting agent is spread on the snow. When it is necessary to absorb heat and moisture, if it does not absorb enough heat and moisture, the solid snow melting agent will not react chemically; third, it takes a long time for the solid snow melting agent to melt ice and snow, especially in low temperature climate conditions .

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is as follows: the present invention provides a road snow melting agent with environmental protection and non-corrosiveness, which has the characteristics of good snow melting and ice melting ability and less corrosiveness to metals and concrete.

In order to solve the above-mentioned technical problems, the environmentally friendly-non-corrosive road snow melting agent of the present invention comprises the following raw materials by weight: 10-50 parts of potassium carbonate, 5-20 parts of urea, and 5-30 parts of 1,3 propylene glycol.

Preferably, the environmentally friendly-non-corrosive road snow melting agent further comprises the following raw materials by weight: 5-30 parts of potassium acetate, 1-15 parts of dicyclohexylamine nitrite, 1-15 parts of sodium tetraborate, diethylene glycol 1-10 parts, 1-15 parts of phytic acid, 0.1-10 parts of sodium lactate, 0.1-5 parts of oxaloacetic acid.

Preferably, the environmentally friendly-non-corrosive road snow melting agent is composed of the following raw materials by weight: 40 parts of potassium carbonate, 20 parts of urea, 20 parts of 1,3 propylene glycol, 10 parts of potassium acetate, and 5 parts of dicyclohexylamine nitrite , 5 parts of sodium tetraborate, 8 parts of diethylene glycol, 10 parts of phytic acid, 5 parts of sodium lactate, and 2 parts of oxaloacetic acid.

The beneficial effects of the present invention are as follows: the environmentally friendly-non-corrosive road snow-melting agent of the present invention is a liquid snow-melting agent, which can be sprayed on the road surface in advance before the arrival of ice and snow, thereby effectively delaying the freezing point of road ice and snow; The ice and snow are directly melted in a pre-wetting manner, and the snow-melting time is shortened; the snow-melting agent of the present invention uses potassium carbonate inorganic salt as the main snow-melting component, does not contain Cl ^- that corrodes metals, and effectively prevents the corrosion of the snow-melting agent to metals and concrete, and the melting of ice and snow. Destruction of vegetation by water containing snow-melting agent; adding urea and 1,3 propylene glycol to potassium carbonate makes the freezing point of the snow-melting agent lower, ensuring that the ice and snow are melted and flow away with liquid water without freezing on the road, ensuring driving Safety.

Detailed ways

The present invention has environmental protection-non-corrosive road snow-melting agent prepared in Examples 1-5 by the following method:

(1) Put 1,3 propylene glycol and diethylene glycol into a mixing tank with stirring, stir evenly at room temperature, and stir at a speed of 180r/min;

(2) Under stirring, add potassium carbonate, potassium acetate and urea to the mixing tank, stir at room temperature for 15 minutes, and stir at a speed of 180 r/min;

(3) Under stirring, add dicyclohexylamine nitrite, sodium tetraborate, oxaloacetic acid, sodium lactate and phytic acid into the mixing tank, stir at room temperature for 30 minutes, and stir at a speed of 300 r/min. Environmentally friendly - non-corrosive road snow melting agent;

(4) When using, add distilled water to the environmental protection-non-corrosive road snow-melting agent to prepare a certain concentration of snow-melting agent solution, and mix it evenly before use.

Example 6-8 also adopts the above-mentioned method, and in each step, the corresponding raw materials contained in Example 6-8 are added, and the raw materials not involved in Example 6-8 are not added.

The present invention is implemented according to the above-mentioned method to prepare the following groups of examples, the components and contents of each group of examples are shown in Table 1, and the performance of the liquid road snow-melting agent obtained by each group of examples is shown in Table 2.

Table I

raw material example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Potassium carbonate 20g 30g 40g 35g 25g 20g 10g 30g Potassium acetate 5g 12g 10g 12g 25g 0g 0g 0g 1,3 Propylene Glycol 10g 15g 20g 11g 15g 10g 10g 30g Diethylene glycol 4g 5g 8g 10g 6g 0g 0g 0g Urea 10g 15g 20g 5g 15g 10g 10g 15g oxaloacetate 2g 1g 2g 1g 3g 0g 0g 0g Dicyclohexylamine nitrite 5g 5g 5g 9g 3g 0g 0g 0g Sodium tetraborate 5g 10g 5g 9g 5g 0g 0g 0g Sodium lactate 5g 5g 5g 10g 9g 0g 0g 0g Phytic acid 10g 10g 10g 12g 12g 0g 0g 0g

The present invention has the performance test of environmental protection-non-corrosive road snow melting agent melting:

1. According to the national standard GBT23851-2009, the snow melting and ice melting ability and freezing point of the environmental protection-non-corrosive road snow melting agent obtained in Examples 1-8 were tested, and the results are shown in Table 2.

(1) Ability to melt snow and ice

Take two ice trays A and B of the same size, add 100 ml of water respectively, put them in a -10°C low temperature incubator and freeze them into ice cubes for use. Weigh the two ice trays A and B with ice cubes. Mass m ₀ and m´ ₀ ; take 10g of snow-melting agent, add 25ml of distilled water, mix evenly, and prepare a snow-melting agent solution; take 10g of sodium chloride, add 25ml of distilled water, mix well, and prepare a sodium-chloride solution; mix the snow-melting agent solution Quickly pour it into the ice tray A containing ice cubes, then put it back into the low temperature incubator at -10°C, take out the ice tray after 0.5 hours, pour its liquid immediately, and quickly weigh the ice tray with the remaining ice cubes The mass m ₁ of A; the sodium chloride solution was quickly poured into the ice tray B filled with ice cubes, then put back into the -10 ℃ low temperature incubator, the ice tray was taken out after 0.5h, the liquid was immediately poured out, and the Quickly weigh the mass m´ ₁ of the ice tray B with the remaining ice cubes; the snow-melting and ice-melting capacity is represented by the letter ω, and the value of the snow-melting and ice-melting capacity is represented by %, ω%=(m ₀ - m ₁ )/( m´ ₀ - m´ ₁ )*100.

(2) Freezing point test

Take 200g of snow-melting agent, add 1000g of distilled water, mix evenly, and prepare a snow-melting agent solution; insert a thermometer into the snow-melting agent solution, place it in a low temperature incubator, record the temperature of the snow-melting agent solution over time, and draw the temperature- Time curve, the temperature corresponding to the flat part of the curve is the freezing point temperature of the snow melting agent at this concentration.

(3) The amount of snow-melting agent used: when the local snow depth is less than 3 cm, the amount of snow-melting agent sprayed per square meter of road is ≤ 200 mL; when the local snow-melting depth is 3-5 cm, the snow-melting agent sprayed per square meter of road When the local snow depth is 5 to 10 cm, the amount of snow melting agent sprayed per square meter of road is 500 to 1000 mL.

Table II

Example Ability to melt snow and ice (relative to the ability of sodium chloride to melt snow and ice)% Freezing point/℃(200g/L water) example 1 196 -23.9 Example 2 194 -23.5 Example 3 204 -24.2 Example 4 190 -22.7 Example 5 197 -23.4 Example 6 195 -22.6 Example 7 193 -23.1 Example 8 198 -22.2

2. Corrosion test of the environmental protection-non-corrosive road snow-melting agent of the present invention to concrete pavement

With reference to the national standard GBT23851-2009, the concrete corrosion rate was measured for the snow-melting agents obtained in Examples 1-8. The results are shown in Table 3. The relative corrosion rate of concrete in Table 3 refers to the snow-melting agents obtained in Examples 1-8 of the present invention to concrete. The ratio of the corrosion rate of the test block to the corrosion rate of the sodium chloride solution to the concrete test block.

Take 8 200mL beakers, add 40g of the snow-melting agent obtained in Examples 1-8 respectively, then add 100mL of water to the 8 beakers, and mix them evenly to obtain a snow-melting agent solution. Immerse into the prepared snow-melting agent solution for 14 days, replace the snow-melting agent solution every 7 days, and weigh the quality of the concrete test block before and after immersion.

The sodium chloride solution was prepared in the same way, and the concrete test block was soaked in the sodium chloride solution for 14 days.

Table 3

Example Concrete corrosion rate% Concrete relative corrosion rate % Sodium chloride solution 4.96 example 1 0.12 2.42 Example 2 0.10 2.02 Example 3 0.08 1.61 Example 4 0.10 2.02 Example 5 0.12 2.42 Example 6 0.13 2.62 Example 7 0.14 2.82 Example 8 0.15 3.02

3. Corrosion test of carbon steel sheet by the environmental protection-non-corrosive road snow melting agent of the present invention

With reference to the national standard GBT23851-2009, the corrosion rate of carbon steel was measured for the snow melting agents obtained in Examples 1-8.

Take 8 200mL beakers, add 40g of the snow-melting agent obtained in Examples 1-8 respectively, then add 100mL of water to the 8 beakers, mix evenly to obtain a snow-melting agent solution, and put 50mm*50mm*2mm carbon steel sheets into the preparation The immersion time is 180 days, and there is no obvious corrosion on the surface of the test block after immersion.

Use the same method to prepare sodium chloride solution, and soak 50mm*50mm*2mm carbon steel sheet with sodium chloride solution. After 7 days of soaking, the carbon steel sheet appears to corrode. After 180 days of soaking, the carbon steel sheet is basically all corrosion.

Claims (2)

1. An environment-friendly and non-corrosive road snow-melting agent is characterized in that: the feed comprises the following raw materials in parts by weight: 10-50 parts of potassium carbonate, 5-20 parts of urea, 5-30 parts of 1, 3-propylene glycol, 5-30 parts of potassium acetate, 1-15 parts of dicyclohexylamine nitrite, 1-15 parts of sodium tetraborate, 1-10 parts of diethylene glycol, 1-15 parts of phytic acid, 0.1-10 parts of sodium lactate and 0.1-5 parts of oxaloacetic acid.

2. The environmentally friendly, non-corrosive road snow melting agent of claim 1, wherein: the feed comprises the following raw materials in parts by weight: 40 parts of potassium carbonate, 20 parts of urea, 20 parts of 1, 3-propylene glycol, 10 parts of potassium acetate, 5 parts of dicyclohexylamine nitrite, 5 parts of sodium tetraborate, 8 parts of diethylene glycol, 10 parts of phytic acid, 5 parts of sodium lactate and 2 parts of oxaloacetic acid.