JP2000104045A - Snow-thawing anti-slip agent and preparation thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely thaw the snow on the road surface for a long period of time by a snow-thawing anti-slip agent which does not adversely affect the environment. SOLUTION: When a snow-thawing anti-slip agent composed of a fatty acid salt of an alkali metal or an alkaline earth metal or a carbonate salt of an alkali metal or an alkaline earth metal; a hydroxide of an alkali metal; and a hydroxide of an alkaline earth metal, a sulfate salt of an alkali metal or an alkaline earth metal or a silicate salt of an alkali metal or an alkaline earth metal is sprinkled on the road surface, freezing of the road surface and road traffic signs can be prevented by the long-term freezing point depression and snow-thawing action by the hydroxide and the carbonate of an alkali metal and the fatty acid salt, the sulfate salt and the silicate of an alkali metal and an alkaline earth metal. Further, by the rust prevention effect of the snow- thawing anti-slip agent which does not adversely affect the environment, corrosion of metals is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snow-melting anti-slip agent, and more particularly to a snow-melting anti-slip agent which melts snow on a road surface for a long time without adversely affecting the environment and prevents a vehicle from slipping.

[0002]

2. Description of the Related Art In winter or cold regions, it is known to apply a road surface anti-slip agent to prevent freezing of the road surface and prevent slippage of automobiles. For example, JP-A-4-285
Japanese Patent No. 684 discloses a road surface anti-slip agent in which a freezing point depressant is blended with shell powder. In addition, Japanese Unexamined Patent Publication
Japanese Patent No. 283782 discloses that a product obtained by reacting dolomite (a carbonate mineral of calcium and magnesium) with acetic acid or the like without being sprayed on a road surface is filled into a porous powder having a diameter of 0.2 mm or less and embedded in a road surface material. Road deicing agents are indicated.

[0003]

However, since chlorides such as calcium chloride and magnesium chloride are added to the anti-slip agent as a freezing point depressant, the metal parts such as the body of the automobile are corroded, and the flora and fauna near the road are removed. Adversely affect. The urea-based anti-slip agent has a low snow-melting effect, and if only a freezing point depressant is mixed with the shell powder,
There is a disadvantage that the persistence of the snow melting effect is low.

A road deicing agent using a porous powder having a diameter of 0.2 mm or less is prepared by mixing a road deicing agent with an asphalt mixture and paving the road to form a road in which the road deicing agent is embedded. 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, even 0.2 mm
The anti-slip effect is low due to the following small particle size.

Accordingly, an object of the present invention is to provide a snow-melting anti-slip agent that melts snow on a road surface for a long time without adversely affecting animals and plants near the road.

[0006]

According to the present invention, a snow-melting anti-slip agent comprises an alkali metal or alkaline earth metal fatty acid salt or an alkali metal or alkaline earth metal carbonate, an alkali metal hydroxide and an alkaline earth metal. It comprises a hydroxide of a class of metals, a sulfate of an alkali metal or an alkaline earth metal, or a silicate of an alkali metal or an alkaline earth metal. Alkaline earth metal fatty acid salts have a freezing point lowering action, snow melting action and rust prevention action, and alkali metal fatty acid salts have a freezing point lowering action and snow melting action. Alkali metal silicates have a snow-melting action and rust-preventing action, and alkali metal hydroxides, carbonates and sulfates and alkaline earth metal sulfates have a snow-melting action, Hydroxides, carbonates and silicates have a rust preventive action. When the snow-melting anti-slip agent according to the present invention is sprayed on the road surface, the freezing point of water lowers to the freezing point, so that water generated by melting snow can be prevented from freezing. The snow melting action generates heat of reaction by reaction with water, and the heat of reaction generates heat of melting to melt snow. The rust-preventing action forms a chemically stable surface layer that is inert to the metal and adheres to the surface of the metal to suppress oxidation of the metal.

[0007] The snow-melting anti-skid according to the present invention promotes the snow-melting effect and is soluble in water, so that it is gradually dissolved in water to enhance the sustainability of the snow-melting effect, and at the same time, to the environment including animals and plants near the human body and roads. It is possible to prevent freezing of the road surface without any adverse effect and to prevent corrosion of metals such as automobiles and road signs.

[0008] The snow melting anti-slip agent is composed of a mixed powder having an average particle size of 1 to 3 mm. Average particle size of mixed powder is 1-3mm
The snow melting action lasts for a long time, and the presence of a snow-melting anti-slip agent between the vehicle tires and the road surface increases the frictional force of the tire against the road surface. Agent). If the average particle size of the mixed powder is less than 1 mm, the snow melting action does not continue, and the mixed powder does not completely enter the inside of the unevenness of the road surface or generate frictional force on the road surface. In addition, the average particle size is 1 m
If the mixed powder is less than m, it becomes a lubricant on the road surface, and on the contrary, it has the disadvantage of promoting slip. Further, when the average particle size of the mixed powder exceeds 3 mm, the surface area of the snow melting anti-slip agent becomes small, so that the snow melting action does not effectively occur, and the mixed powder does not catch on the unevenness of the road surface, so that the road surface and the tire The friction force between the two does not increase.

The method for producing a snow-melting anti-slip agent according to the present invention comprises reacting an alkali metal or alkaline earth metal fatty acid salt or an alkali metal or alkaline earth metal carbonate with an alkali metal hydroxide aqueous solution to form an alkaline aqueous solution. The step of obtaining, adding and reacting an alkaline aqueous solution with a hydroxide of an alkaline earth metal, a sulfate of an alkali metal or an alkaline earth metal or a silicate of an alkali metal or an alkaline earth metal, and reacting with the alkali metal and the alkaline earth metal. Obtaining one or more selected from the group consisting of fatty acid salts, carbonates, hydroxides, sulfates and silicates. The method further includes a step of adding an alkaline earth metal hydroxide, an alkali metal or alkaline earth metal sulfate, or an alkali metal or alkaline earth metal silicate to the alkaline aqueous solution and mixing. By changing the added substances and the amounts thereof according to the road surface and weather conditions, it is possible to produce a snow-melting anti-slip agent according to the action and effect of each reaction product and mixture. Further, it is filtered, dried and pulverized, and has an average particle size of 1
A step of obtaining a mixed powder of 3 mm may be included.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a snow-melting anti-skid according to the present invention and a method for producing the same will be described. The snowmelt slipper according to the present invention comprises a fatty acid salt of an alkali metal or an alkaline earth metal or a carbonate of an alkali metal or an alkaline earth metal, a hydroxide of an alkali metal, a hydroxide of an alkaline earth metal, and an alkali metal. Alternatively, it is composed of an alkaline earth metal sulfate or an alkali metal or alkaline earth metal silicate.

The alkali metal fatty acid salts include sodium formate (NaHCOO), potassium formate (KHCOO), sodium acetate (NaCH ₃ COO), and potassium acetate (K
CH ₃ COO), sodium propionate (NaC ₂ H ₅₎
COO) and potassium propionate (KC ₂ H ₅ COO)
Is selected from Alkaline earth metal fatty acid salts include magnesium formate (Mg (HCOO) ₂ ), calcium formate (Ca (HCOO) ₂ ), magnesium calcium formate (MgCa (HCOO) ₄ ), barium formate (Ba (HCO
O) ₂ ), magnesium acetate (Mg (CH ₃ COO) ₂ ), calcium acetate (Ca (CH ₃ COO) ₂ ), magnesium calcium acetate (MgCa (CH ₃ COO) ₄ ), barium acetate (Ba (CH ₃ COO) ) _2), magnesium propionate _{(Mg (C 2 H 5 COO} ) 2), calcium propionate _{(Ca (C 2 H 5 COO} ) 2), magnesium propionate calcium _{(MgCa (C 2 H 5 COO} ) 4) and It is selected from barium propionate (Ba (C ₂ H ₅ COO) ₂ ). The alkali metal carbonate is sodium carbonate (Na ₂
CO ₃ ) and potassium carbonate (K ₂ CO ₃ ). Carbonates of alkaline earth metals are magnesium carbonate (MgCO _3), calcium carbonate (CaCO _3), is selected from calcium magnesium carbonate (MgCa (CO _{3) 2)} and barium carbonate (BaCO _3).

The alkali metal hydroxide is selected from sodium hydroxide (NaOH) and potassium hydroxide (KOH).

Alkaline earth metal hydroxides include magnesium hydroxide (Mg (OH) ₂ ) and calcium hydroxide (Ca
(OH) ₂ ), magnesium calcium hydroxide (MgCa
(OH) ₄ ) and barium hydroxide (Ba (OH) ₂ ). Alkali metal sulfate is sodium sulfate (N
a ₂ SO ₄ ) and potassium sulfate (K ₂ SO ₄ ). The alkaline earth metal sulfate is selected from magnesium sulfate (MgSO ₄ ), calcium sulfate (CaSO ₄ ), magnesium calcium sulfate (MgCa (SO ₄ ) ₂ ) and barium sulfate (BaSO ₄ ). The alkali metal silicate is selected from sodium silicate (Na ₂ SiO ₃ ) and potassium silicate (K ₂ SiO ₃ ). Alkaline earth metal silicates include magnesium silicate (MgSiO ₃ ), calcium silicate (CaSiO ₃ ), magnesium calcium silicate (MgCa (SiO ₃ ) ₂ ) and barium silicate (Ba).
SiO ₃ ).

In preparing the snow-melting anti-slip agent according to the present invention, the amount of the alkali metal or alkaline earth metal fatty acid salt or alkali metal or alkaline earth metal carbonate added to the alkaline earth metal hydroxide is The addition rate of the alkali metal or alkaline earth metal sulfate or the alkali metal or alkaline earth metal silicate varies depending on the individual reaction.

The individual reactions and mixing examples are represented by chemical reaction formulas.
And below. 2NaHCOO + KOH + Ca (OH)_Two → Ca (HCO
O)_Two+ 2NaOH + KOH NaHCOO + 2KOH + Na_TwoSO_Four → NaHCOO
+ 2NaOH + K_TwoSO_Four  2NaHCOO + 2KOH + CaSO_Four → Ca (HCO
O)_Two+ 2NaOH + K_TwoSO_Four  NaHCOO + 2KOH + Na_TwoSiO_Three → NaHCO
O + 2NaOH + K_TwoSiO_Three  2NaHCOO + 2KOH + CaSiO_Three → Ca (HC
OO)_Two+ 2NaOH + K_TwoSiO_Three  Mg (HCOO)_Two+ KOH + Ca (OH)_Two → Ca (HC
OO)_Two+ Mg (OH)_Two+ KOH Mg (HCOO)_Two+ 2KOH + Na_TwoSO_Four → 2NaH
COO + Mg (OH)_Two+ K_TwoSO_Four  Mg (HCOO)_Two+ 2KOH + CaSO_Four → Ca (HC
OO)_Two+ Mg (OH)_Two+ K_TwoSO_Four  Mg (HCOO)_Two+ 2KOH + Na_TwoSiO_Three → 2Na
HCOO + Mg (OH)_Two+ K_TwoSiO_Three  Mg (HCOO)_Two+ 2KOH + CaSiO_Three → Ca (H
COO)_Two+ Mg (OH)_Two+ K_TwoSiO_Three  2Na_TwoCO_Three+ 2KOH + Ca (OH)_Two → CaCO_Three+
4NaOH + K_TwoCO_Three  Na_TwoCO_Three+ 2KOH + Na_TwoSO_Four → Na_TwoCO_Three+2
NaOH + K_TwoSO_Four  Na_TwoCO_Three+ 2KOH + CaSO_Four → CaSO_Four+ 2N
aOH + K_TwoCO_Three  Na_TwoCO_Three+ 2KOH + Na_TwoSiO_Three → Na_TwoCO_Three+
2NaOH + K_TwoSiO_Three  Na_TwoCO_Three+ 2KOH + CaSiO_Three → CaCO_Three+2
NaOH + K_TwoSiO_Three  2MgCO_Three+ 2KOH + Ca (OH)_Two → CaCO_Three+
2Mg (OH)_Two+ K_TwoCO_Three  MgCO_Three+ 2KOH + Na_TwoSO_Four → Na_TwoCO_Three+ M
g (OH)_Two+ K_TwoSO_Four  2MgCO_Three+ 4KOH + CaSO_Four → CaSO_Four+2
Mg (OH)_Two+ 2K_TwoCO_Three  MgCO_Three+ 2KOH + Na_TwoSiO_Three → Na_TwoCO_Three+
Mg (OH)_Two+ K_TwoSiO_Three  MgCO_Three+ 2KOH + CaSiO_Three → CaCO_Three+ M
g (OH)_Two+ K_TwoSiO_Three

From the above chemical reaction formulas, the molar ratio of alkali metal sulfate or silicate to alkali metal fatty acid salt, alkaline earth metal hydroxide to alkali earth metal fatty acid salt, alkali metal or alkaline earth metal salt Molar ratio of sulfate of alkali metal or silicate of alkali metal or alkaline earth metal, molar ratio of sulfate of alkali metal or alkaline earth metal or silicate of alkali metal or alkaline earth metal to carbonate of alkali metal And the molar ratio of the alkali metal sulfate to the alkaline earth metal carbonate or the alkali metal or alkaline earth metal silicate molar ratio is theoretically 1: 1. 1.2, preferably 1: 0.95 to 1.1
And Also, the molar ratio of the alkaline earth metal hydroxide, sulfate or silicate to the alkali metal fatty acid salt, the molar ratio of the alkaline earth metal hydroxide to the alkali metal carbonate, and the alkaline earth metal carbonate The molar ratio of hydroxide or sulfate of alkaline earth metal to salt is theoretically 2: 1, but in the present invention, it is 2: 0.
9 to 1.2, preferably 2: 0.95 to 1.1. Outside of these molar ratios, the effects of unreacted residuals affect the freezing point, snowmelt and rust preventive effects and their sustainability. The amount of alkali metal or alkaline earth metal fatty acid salt or alkali metal or alkaline earth metal carbonate added to the amount of alkali earth metal hydroxide, alkali metal or alkaline earth metal sulfate or alkali metal added. Alternatively, by changing the addition amount of the silicate of the alkaline earth metal within the range of the molar ratio, depending on the road surface and weather conditions, control by accelerating or suppressing the freezing point lowering action, the snow melting action and the rust prevention action. Can be.

When the molar ratio is out of the above range, the effects of freezing point fall, snow melting and rust prevention and their sustainability are affected. For example, magnesium calcium carbonate (MgCa (C
O ₃ ) ₂ ) 1 mol (magnesium carbonate (MgCO ₃ ) 1 mol +
1 mol of calcium carbonate (CaCO ₃ )
l of calcium hydroxide (Ca (OH) ₂ ) reacts,
The amount of calcium hydroxide (Ca (OH) ₂ ) added is 0.9 mol
If less, unreacted magnesium calcium carbonate (M
Due to the low solubility of gCa (CO ₃ ) ₂ ), the immediate effect such as the antirust effect is reduced. On the other hand, calcium hydroxide (Ca
If the amount of (OH) ₂ ) exceeds 1.2 mol, unreacted calcium hydroxide (Ca (OH) ₂ ) remains, and the durability of the rust-preventive effect is reduced.

Further, magnesium calcium acetate (Mg)
1 mol of Ca (CH ₃ COO) ₄ ) (magnesium acetate (Mg
(CH ₃ COO) ₂ ) 0.5 mol + calcium acetate (Ca (C
The _{H 3 COO) 2) 0.5mol)} , since calcium silicate theoretically 1 mol (CaSiO ₃₎ are reacted, if the addition amount of calcium silicate (CaSiO ₃₎ is less than 0.9 mol, magnesium acetate unreacted Calcium (MgCa (CH ₃ C
OO) ₄ ) and potassium hydroxide (KOH)
Increases freezing, snowmelt and rust protection, but reduces sustainability. On the other hand, when the added amount of calcium silicate (CaSiO ₃ ) exceeds 1.2 mol, unreacted calcium silicate (CaSiO ₃ )
SiO ₃ ) remains and the freezing point and snow melting effects are reduced.

Further, 2 mol of magnesium calcium carbonate
(1 mol of magnesium carbonate (MgCO ₃ ) +1 mol of calcium carbonate (CaCO ₃ )) is added with 1 mol of calcium sulfate (CaSO ₄ ).
When the added amount of SO ₄ ) is less than 0.9 mol, the snow melting effect is reduced. On the other hand, when it exceeds 1.2 mol, the snow melting effect increases due to the exothermic effect and the snow melting effect lasts for a long time due to the low solubility of calcium sulfate (CaSO ₄ ), but the immediate effect and the rust prevention are reduced.

The method for using the snow-melting anti-slip agent of the present invention is used by spraying on a road surface before or after freezing snow in winter. The application amount may be about ²⁰ to 80 g / m ² .

In the present invention, the snow-melting slip preventive is based on weight.
For example, as a fatty acid salt of an alkali metal,
136 parts of thorium (NaHCOO)
(KOH) 500 parts of an aqueous solution in which 112.2 parts are dissolved
, And the mixture is stirred and reacted at room temperature.
SO_Four) And agitated. Chemical equation of this reaction
Is as follows. NaHCOO + KOH → KHCOO + NaOH 2KHCOO + 2NaOH + CaSO_Four → Ca (HCO
O)_Two+ 2NaOH + K_TwoSO_Four  To summarize the two equations, 2NaHCOO + 2KOH + CaSO_Four → Ca (HCO
O)_Two+ 2NaOH + K_TwoSO_Four  Becomes

From the above reaction formula, sodium formate (NaH
2 mol of COO) and 2 mol of potassium hydroxide (KOH), 1 mol (136 g / mol) of calcium sulfate (Ca
SO ₄ ) reacts, so that calcium sulfate (CaSO ₄ )
Is added in an amount of 122 to 163 parts (0.9 to 1.2 mol),
Preferably, it is 130 to 137 parts (0.95 to 1.1 mol).

Thereafter, the mixture is filtered, dried and pulverized to obtain a particle size of 1.0 to 1.0 which is composed of 130 parts of calcium formate (Ca (HCOO) ₂ ) and a small amount of sodium hydroxide (NaOH) and potassium sulfate (K ₂ SO ₄ ). 135 parts of a 3.0 mm mixed powder snow-melting slip preventive agent can be obtained.

In the above reaction, calcium sulfate (CaSO
_If the added amount of ₄ ) is less than the theoretically reacted amount of 136 parts, deliquescent potassium formate (KH
Although COO) and sodium hydroxide (NaOH) remain, the snow-melting effect is enhanced, but if it is less than 122 parts, it will be melted too quickly and the durability will be reduced. On the other hand, if the amount of calcium sulfate (CaSO ₄₎ is greater than 136 parts, when calcium sulfate (CaSO ₄₎ is water (H ₂ O) and reaction to dihydrate (CaSO ₄ · 2H ₂ O) heating Therefore, the snow melting effect is enhanced, and the solubility of calcium sulfate (CaSO ₄ ) is small, so that the snow melting effect lasts for a long time. As described above, the amount of added calcium sulfate (CaSO ₄ ) can be changed within the range of 122 to 163 parts (0.9 to 1.2 mol) to produce a snow melting anti-slip agent according to the road surface and weather conditions. it can.

[0025]

EXAMPLES Examples of the snow-melting anti-slip agent of the present invention will be described below along with comparative examples.

Example 1 184.3 parts of magnesium calcium carbonate (MgCa (CO ₃ ) ₂ ) was added to 820 parts of an aqueous solution in which 224.4 parts of potassium hydroxide (KOH) was dissolved, and the mixture was stirred and reacted at room temperature. . Next, 74 parts of calcium hydroxide (Ca (OH) ₂ ) was added, and the mixture was stirred and reacted, mixed, filtered, dried and pulverized to obtain 132 parts of magnesium calcium hydroxide (MgCa (OH) ₄ ) as a reaction product. ,
A snowmelt slipper having a particle size of 1 to 3 mm containing 100 parts of calcium carbonate (CaCO ₃ ) and 3 parts of potassium hydroxide (KOH) was obtained. Under the condition of an average temperature of −4 ° C. and a snowfall of 3 cm, the obtained snow-melting anti-slip agent was sprayed on the surface of a paved road at about 50 g / m ² . The snow began to melt after 30 minutes, and almost after 3 hours. During this time, snow was falling, but no snow was accumulated even after 5 hours. Thirty minutes later, when the snow began to melt, a vehicle braking experiment was performed. The vehicle was stopped at 40 cm after applying the brake at a speed of 5 km / h.

Comparative Example 1 132 parts of magnesium calcium hydroxide (MgCa (OH) ₄ ) and calcium carbonate (C
100 parts of aCO ₃ ), 3 parts of potassium hydroxide (KOH) and a small amount of water were sufficiently mixed with a ribbon mixer, and the particle diameter was 1 to 3.
235 parts of a mixed powder having a thickness of 235 mm were obtained. About 50 g / m ² of the obtained mixed powder was sprayed on the surface of a paved road under the condition of snowfall of 3 cm at an average temperature of −4 ° C. The snow began to melt after 30 minutes, and almost after 3 hours. However, it was snowing during this time, and it began to snow 4 hours later. Also,
When the snow began to melt 30 minutes later, a braking test of the car was performed. At a speed of 5 km / h, the vehicle stopped at 49 cm after applying the brake.

Therefore, in the first embodiment, as compared with the first comparative example, after the snow-melting anti-slip agent is sprayed, the snow on the road surface can be suppressed, and the braking distance of the automobile brake can be shortened.

Example 2 An aqueous solution in which 300.3 parts of magnesium calcium acetate (MgCa (CH ₃ COO) ₄ ) is dissolved in 224.4 parts of potassium hydroxide (KOH)
The reaction was stirred at room temperature in addition to 50 parts. Next, 220 parts of calcium silicate (CaSiO ₃ ) was added, and the mixture was stirred and reacted, mixed, filtered, dried and pulverized to obtain 300 parts of calcium acetate (Ca (CH ₃ COO) ₂ ) as a reaction product, and magnesium hydroxide. calcium (MgCa (OH) ₄₎ 131 parts of potassium silicate (K ₂ SiO ₃₎ particle size 1 containing 3 parts
A 3 mm snow-melt slip inhibitor was obtained. Snowfall 4c with average temperature of -7 ° C
m, the obtained road deicing agent was added in an amount of 30 g / m ^2.
Sprayed on the surface of the pavement to a degree. The snow began to melt after 30 minutes, and almost after 4 hours. During this time it was snowing, but did not snow even after 5.5 hours. 30 minutes later, when the snow began to melt, an automobile braking experiment was performed. At a speed of 5 km / h, the brake was applied at 47 c.
Stopped at m.

Comparative Example 2 Calcium acetate (Ca (CH ₃
(COO) ₂ ) 300 parts, magnesium calcium hydroxide (MgCa (OH) ₄ ) 131 parts, potassium silicate (K ₂ Si)
3 parts of O ₃ ) and a small amount of water (H ₂ O) were sufficiently mixed by a ribbon mixer to obtain 434 parts of a mixed powder having a particle size of 1 to 3 mm.
About 30 g / m ² of the obtained mixed powder was sprayed on the surface of a paved road under the condition of snowfall of 4 cm at an average temperature of −7 ° C. 3
The snow began to melt after 0 minutes and almost 4 hours later. However, it was snowing during this time, and it began to snow 6 hours later. Further, when the snow began to melt 30 minutes later, an automobile braking test was performed. The vehicle was braked at a speed of 5 km / h and stopped at 55 cm.

Therefore, in the second embodiment, as compared with the second comparative example, the snow cover on the road surface can be suppressed and the braking distance of the brake of the vehicle can be shortened after the snow-melting anti-slip agent is sprayed.

Example 3 184.3 parts of magnesium calcium carbonate (MgCa (CO ₃ ) ₂ ) was added to 820 parts of an aqueous solution in which 224.4 parts of potassium hydroxide (KOH) was dissolved, and the mixture was stirred and reacted at room temperature. . Next, 150 parts of calcium sulfate (CaSO ₄ ) was added and mixed with stirring, followed by filtration, drying and pulverization, 132 parts of magnesium calcium hydroxide (MgCa (OH) ₄ ) and potassium carbonate (K ₂ CO ₃ ).
₃₎ 3 parts of calcium sulfate (CaSO ₄₎ particle size containing 150 parts to obtain a snow melting proof lubricant 1 to 3 mm. Average temperature -4
Under the conditions of snowfall of 3 cm at 40 ° C., the obtained anti-freezing lubricant was
g / m ² was sprayed on the surface of the paved road. The snow began to melt after 30 minutes, and almost after 4 hours. During this time, snow was falling, but no snow was accumulated even after 5 hours. Thirty minutes later, when the snow began to melt, a braking test was performed on the car, and after braking at a speed of 5 km / h, 43c was applied.
Stopped at m.

Comparative Example 3 132 parts of calcium magnesium hydroxide (MgCa (OH) ₄ ) and potassium carbonate (K ₂ C)
3 parts of O _3, 150 parts of calcium sulfate (CaSO ₄ ) and a small amount of water (H ₂ O) were sufficiently mixed by a ribbon mixer to obtain 285 parts of a mixed powder having a particle size of 1 to 3 mm. Average temperature -4
Under the condition of 3 cm snowfall at 40 ° C., 40 g of the obtained mixed powder
/ M ² was sprayed on the surface of the paved road. The snow began to melt after 30 minutes, and almost after 4 hours. However, it was snowing during this time, and it started to snow 5 hours later.
Also, when the snow began to melt 30 minutes later, an automobile braking test was performed. The vehicle was braked at a speed of 5 km / h and stopped at 51 cm.

Therefore, in the third embodiment, as compared with the third comparative example, the snow cover on the road surface can be suppressed and the braking distance of the automobile brake can be shortened after the snow-melting anti-slip agent is sprayed.

[0035]

As described above, the snow melting anti-slip agent of the present invention melts snow on a road surface to prevent the road surface and road signs from freezing. As a result, the braking distance of the vehicle is shortened and slippage is eliminated to prevent a traffic accident. Further, even if the snow-melting anti-slip agent of the present invention is sprayed on a road surface, there is an advantage that corrosion of automobiles and road signs is prevented, and that animals and plants near the road are not adversely affected.

Claims (5)

[Claims] 1. An alkali metal or alkaline earth metal fatty acid salt or an alkali metal or alkaline earth metal carbonate, an alkali metal hydroxide, an alkaline earth metal hydroxide, an alkali metal or alkaline earth metal. A snow-melting anti-slip agent comprising a sulfate of a class of metals or a silicate of an alkali metal or an alkaline earth metal. 2. The snow-melting slipper according to claim 1, comprising a mixed powder having an average particle size of 1 to 3 mm. 3. A step of reacting an alkali metal or alkaline earth metal fatty acid salt or an alkali metal or alkaline earth metal carbonate with an aqueous solution of an alkali metal hydroxide to obtain an alkaline aqueous solution, An earth metal hydroxide, an alkali metal or alkaline earth metal sulfate, or an alkali metal or alkaline earth metal silicate is added and reacted to produce alkali metal and alkaline earth metal fatty acid salts, carbonates, and water. Obtaining one or more selected from the group consisting of oxides, sulfates and silicates. 4. A step of reacting an alkali metal or alkaline earth metal fatty acid salt or an alkali metal or alkaline earth metal carbonate with an aqueous solution of an alkali metal hydroxide to obtain an alkaline aqueous solution. Adding and mixing an earth metal hydroxide, an alkali metal or alkaline earth metal sulfate or an alkali metal or alkaline earth metal silicate, and mixing. 5. The method according to claim 3, further comprising a step of filtering, drying and pulverizing to obtain a mixed powder having an average particle size of 1 to 3 mm.
3. The method for producing a snow-melting anti-slip agent according to item 1.