JP3566822B2 - Formulation of road deicing agent - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing a road deicing agent for preventing freezing of roads and prevention of slipping of automobiles and corrosion of vehicle bodies or road signs during winter snowfall or freezing without adversely affecting animals and plants near roads.
[0002]
[Prior art]
In winter or cold regions, it is known to apply an anti-slip agent to the road surface to prevent the road surface from freezing and prevent the vehicle from slipping. For example, Japanese Patent Application Laid-Open No. 4-285684 discloses a road surface anti-slip agent in which a freezing point depressant is mixed with shell powder. Although it is not a spraying agent to the road surface, JP-A-2-283782 discloses that a product obtained by reacting dolomite (a calcium / magnesium carbonate mineral) with acetic acid or the like is filled in a porous powder of 0.2 mm or less. 1 shows a road deicing agent that has been applied.
[0003]
[Problems to be solved by the invention]
However, road surface anti-slip agents that use chlorides such as calcium chloride and magnesium chloride as freezing point depressants corrode automobiles and adversely affect animals and plants near roads. The urea-based anti-slip agent has a low snow-melting effect, and has only a low melting point effect added to the shell powder, so that the snow-melting effect has low durability.
[0004]
A road deicing agent using a porous powder having a diameter of 0.2 mm or less is prepared by mixing the road deicing agent with an asphalt mixture and paving the road to form a road deicing agent embedded road. Although the method of use is different, even if this road deicing agent is sprayed on the road surface and used as a road surface anti-slip agent, the anti-slip effect is low due to the small particle size of 0.2 mm or less.
[0005]
The present invention provides a method for producing a road deicing agent capable of preventing road surface freezing, having a high snow melting effect and its sustainability, and preventing corrosion of automobiles, road signs, etc., without adversely affecting animals and plants near the road. The purpose is to:
[0006]
[Means for achieving the object]
The method for producing the road deicing agent according to the present invention is a mixed aqueous solution in which 10 to 60 parts of acetate and 5 to 35 parts of a rust inhibitor are added to 15 to 95 parts of water, and the acetate and the rust inhibitor are dissolved on a weight basis. And mixing 15 to 90 parts of a porous aggregate having an average particle size of 0.6 to 13.2 mm with the mixed aqueous solution, and impregnating the mixed aqueous solution into the pores of the porous aggregate. Drying the obtained mixture to obtain a porous aggregate in which the acetate and the rust inhibitor remain in the pores.
[0007]
A porous aggregate having an average particle size of 0.6 to 13.2 mm is filled with acetate and rust inhibitor which has a freezing point and snow melting effect, and is used by spraying it on the road surface. It is possible to prevent the freezing of the road surface, to promote the snow-melting effect and to enhance the persistence of the snow-melting effect, and to prevent corrosion of metals such as automobiles and road signs.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a method for producing a road deicing agent according to the present invention will be described below.
When the road deicing agent of the present invention is produced, 10 to 60 parts, preferably 15 to 50 parts, of acetate and 5 to 35 parts, preferably 8 to 15 parts of a rust inhibitor are added to water by weight. In addition to 15 to 95 parts, preferably 23 to 65 parts, an acetate and a rust inhibitor are dissolved in water to prepare a mixed aqueous solution. Acetates are sodium acetate, potassium acetate, calcium acetate, silicon acetate, cobalt acetate, calcium / magnesium acetate, tin acetate, iron acetate, copper acetate, copper potassium acetate, copper calcium acetate, nickel acetate, manganese acetate, lithium acetate, It is an acetate of a metal selected from magnesium acetate. The rust preventive is an inorganic rust preventive selected from calcium hydroxide, magnesium hydroxide, calcium hydrogen phosphate, sodium tripolyphosphate, calcium carbonate, calcium acetate, phosphoric acid, sodium nitrite and potassium nitrite. Next, a porous aggregate having an average particle size of 0.6 to 13.2 mm and a mixed aqueous solution are mixed, and the pores of the porous aggregate are impregnated with an aqueous solution containing an acetate and a rust inhibitor. The porous aggregate is 15 to 90 parts, preferably 35 to 75 parts, by weight, based on the weight of the lava powder, pumice powder, foamed glass powder, calcined bauxite, and hard slag. Thereafter, the obtained mixture is heated and dried to obtain a porous aggregate in which the acetate and the rust inhibitor remain in the pores.
[0009]
If the average particle diameter of the porous aggregate having an average particle diameter of 0.6 to 13.2 mm is less than 0.6 mm or more than 13.2 mm, the effect of preventing road surface slip is reduced. The range is from 6 to 13.2 mm, preferably from 1.0 to 10.0 mm. If the amount of acetate is less than 10 parts, the freezing point and the snow melting effect are not sufficient, and even if it exceeds 60 parts, the freezing point and the snow melting effect are the same. If the amount of the rust inhibitor is less than 5 parts, the corrosion inhibiting effect is insufficient, and if it exceeds 35 parts, the corrosion inhibiting effect is the same. If the amount of water is less than 15 parts, the dissolution of the acetate and the rust inhibitor is not sufficient. In winter, before freezing snow and after freezing snow, the amount of spraying the road deicing agent of the present invention on the road surface may be about ²⁰ to 80 g / m ² .
[0010]
【Example】
Hereinafter, the production method of the road deicing agent of the present invention will be described with reference to examples.
[Example 1]
32 parts of potassium acetate and 8 parts of sodium tripolyphosphate were added to and dissolved in 40 parts of water, and mixed with 60 parts of the obtained lava powder having an average particle size of 2.5 to 5.0 mm. Next, the mixture was heated to evaporate water and dried to obtain 97 parts of a road deicing agent filled with lava powder with potassium acetate and sodium tripolyphosphate. Under the condition of an average temperature of −4 ° C. and a snowfall of 5 cm, the obtained road deicing agent was sprayed on the surface of the paved road at about 60 g / m ² . The snow began to melt after 30 minutes and almost 3 hours later. During this time, it was snowing, but did not snow even after 5 hours. Thirty minutes later, when the snow began to melt, a braking test of the car was performed. At a speed of 5 km / h, the vehicle stopped at 43 cm after the brake was applied.
[0011]
[Comparative Example 1]
32 parts of potassium acetate and 8 parts of sodium tripolyphosphate are mixed with 60 parts of lava powder having an average particle size of 2.5 to 5.0 mm, and the mixed aqueous solution is applied to a pavement surface at an average temperature of -4 ° C under a snowfall of 5 cm / 60 g / p. and m ² about spraying. The snow began to melt after 30 minutes and almost 3 hours later. However, it was snowing during this time, and after three hours had passed, it began to snow. Also, when the snow began to melt 30 minutes later, a braking test of the car was performed. The vehicle stopped at 46 cm at a speed of 5 km / h after the brake was applied.
[0012]
[Example 2]
15 parts of calcium acetate / magnesium and 10 parts of sodium nitrite were added to and dissolved in 25 parts of water, and the resulting mixed aqueous solution was mixed with 75 parts of hard slag having a particle size of 5 to 13.0 mm. Next, the mixture was heated to evaporate water and dried to obtain 98 parts of a road deicing agent in which the pores of the hard slag were filled with calcium acetate / magnesium and sodium nitrite. This was sprayed on the pavement surface at a rate of about 40 g / m ² under conditions of 6 cm of snowfall at an average temperature of -7 ° C. The snow began to melt after 30 minutes, and almost after 4 hours. Also, when the snow began to melt 30 minutes later, an automobile braking test was performed. At a speed of 5 km / h, the vehicle stopped at 51 cm after the brake was applied.
[0013]
[Comparative Example 2]
15 parts of a product obtained by reacting dolomite having an average particle size of 0.2 mm with acetic acid was filled in 85 parts of porous hard slag powder, and a road deicing agent was applied to the pavement surface under the conditions of an average temperature of -7 ° C and 6 cm of snowfall. About 40 g / m ^{2 was} sprayed. The snow began to melt after 30 minutes, and almost after 5 hours. Also, when the snow began to melt 30 minutes later, a braking test was performed on the car. At a speed of 5 km / h, the vehicle stopped at 106 cm after the brake was applied.
[0014]
【The invention's effect】
As described above, the road deicing agent obtained by the present invention, when sprayed on a road surface, prevents the road surface from freezing, increases the snow melting effect and its sustainability, and also has a high road surface slip prevention effect. Prevents corrosion of plants, etc., and does not adversely affect animals and plants near the road.

Claims (3)

On a weight basis, adding 10 to 60 parts of acetate and 5 to 35 parts of a rust inhibitor to 15 to 95 parts of water to prepare a mixed aqueous solution in which the acetate and the rust inhibitor are dissolved,
Mixing 15 to 90 parts of the porous aggregate having an average particle diameter of 0.6 to 13.2 mm with the mixed aqueous solution, and impregnating the mixed aqueous solution into the pores of the porous aggregate;
Drying the resulting mixture to obtain a porous aggregate in which the acetate and the rust inhibitor remain in the pores. As acetates, sodium acetate, potassium acetate, calcium acetate, silicon acetate, cobalt acetate, calcium / magnesium acetate, tin acetate, iron acetate, copper acetate, copper acetate, potassium calcium acetate, nickel acetate, manganese acetate, lithium acetate, acetic acid Select metal acetate from magnesium, and inorganic rust inhibitor from calcium hydroxide, magnesium hydroxide, calcium hydrogen phosphate, sodium tripolyphosphate, calcium carbonate, calcium acetate, phosphoric acid, sodium nitrite, potassium nitrite as rust inhibitor The method for producing a road deicing agent according to claim 1, wherein inorganic porous aggregate is selected from lava powder, pumice powder, foamed glass powder, calcined bauxite, and hard slag as porous aggregate. The antifreeze road according to claim 1 or 2, wherein the acetate is 15 to 50 parts, the rust preventive is 8 to 15 parts, the water is 23 to 65 parts, and the porous aggregate is 35 to 75 parts by weight. Formulation of the agent.