JPH10251622A - Antifreezing agent and particle thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antifreezing agent for a road surface covered with snow which possesses excellent fast-acting properties and persistence of the effect and can offer marked effect of preventing slipping. SOLUTION: A water-soluble polymer in an amt. of 0.001 to 20 pts.wt. and 0.001 to 20 pts.wt. at least one inorg. material selected from among silica gel, alumina gel, sodium silicate, and potassium silicate are added to 100 pts.wt. mixture of a salt of a 1-10C carboxylic acid with a 1-6C water-soluble polyhydric alcohol.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an antifreezing agent, and more particularly to an antifreezing agent which is excellent in quick action and sustainability and has a large anti-slip effect.

[0002]

2. Description of the Related Art In snowy and cold regions, prevention of freezing of the road surface during snowfall is one of the indispensable measures to ensure the safety of road traffic in winter. On the road after snowfall,
Due to the tires of vehicles passing, human footwear, and the like, the snow surface often becomes in a pressed snow state or an icy snow state. In recent years, in particular, the tires have changed from spiked tires to studless tires, and since the snow on the road surface has been compacted, the tires are further slipped by the tires. For this reason, a tire is prevented from slipping by spraying a deicing agent, sand, or the like, or by mechanically making the road surface uneven.

[0003] As antifreeze agents, sodium chloride (salt), calcium chloride, magnesium chloride, acetates and the like are known. This type of antifreeze agent has a quick effect but is inferior in sustainability. And the slip prevention effect is not sufficient. For this reason, the spraying interval has to be shortened and the number of times of spraying has to be increased, which is not efficient.

[0004] An antifreezing agent comprising sodium chloride, styrene-butadiene copolymer, siliconate, etc. has been proposed (Japanese Patent Application Laid-Open No. 56-59904).
Insufficient freezing prevention effect. Antifreezing agents comprising inorganic salts, polyesters such as polyethylene terephthalate, surfactants, sodium sesquicarbonate and the like have also been proposed (Japanese Patent Application Laid-Open No. 58-11577). It is enough. An antifreezing agent comprising a polyhydric alcohol, an alkali metal salt of an inorganic acid or an organic acid, and a basic compound for adjusting the pH has also been considered (Japanese Patent Application Laid-Open No. HEI 1-1990).
Japanese Patent Application Laid-Open No. 190783), the durability and the effect of preventing slip on the road surface are insufficient.

[0005] There is a method in which an aqueous solution of a deicing agent is processed into granules for use. However, it lacks immediate action, and often sinks deeply into the snow in a perforated form and is diluted in the snow. The effect of preventing slip is reduced. There is also a method of spraying sand or crushed stones to prevent slippage, but it has no snow melting effect itself and slips into the snow with the passage of time, and thus lacks sustainability. Composition comprising a porous substance such as shell powder mixed with an aqueous solution of sodium chloride, calcium chloride, magnesium chloride or the like (JP-A-4-285
664 and JP-A-6-313165) have been proposed, but the amount of absorption and retention of the porous substance is small and the durability is poor.

[0006]

As described above, the conventional antifreezing agents have a quick effect but are inferior in sustainability. In addition, the granular type antifreezing agent lacked the quick-acting effect or was inferior in slip prevention effect due to sinking in snow and being diluted in snow. That is, at present, almost no antifreezing agent having excellent quick-acting and long-lasting properties and a large anti-slip effect has been found.

The present invention has been made in view of the above circumstances, and has as its object to provide an antifreezing agent which is excellent in quick action and sustainability and has a large slip preventing effect.

[0008]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies on the above objects, and as a result, have used a mixture of a specific carboxylic acid salt and a water-soluble polyhydric alcohol, and When a water-soluble polymer and at least one selected from silica gel, alumina gel, sodium silicate and potassium silicate are added, an antifreeze excellent in quick action and durability can be obtained. By impregnating a specific porous substance with an aqueous solution of an inhibitor, it was found that a granular material having an excellent anti-freezing agent for road surfaces and having the above-mentioned properties and a large anti-slip effect was obtained, and the present invention was completed. .

That is, the present invention relates to a)
B) water-soluble polymer in 100 parts by weight of a mixture of a carboxylic acid salt of (1) and a water-soluble polyhydric alcohol having 1 to 6 carbon atoms.
001-20 parts by weight, and c) 0.001-20 parts by weight of at least one inorganic substance selected from silica gel, alumina gel, sodium silicate and potassium silicate. Agent (Claim 1)
And at least one selected from gravel, crushed stone, shells, perlite, vermiculite, pumice, zeolite, diatomaceous earth, peat, charcoal and activated carbon, and have a particle size of 0.1 to A granular material (Claim 2) characterized in that a porous material having a thickness of 10 mm is impregnated with an aqueous solution of the above-mentioned antifreezing agent.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The salts of carboxylic acids used as one of the component a in the present invention include formic acid, acetic acid, lactic acid,
Malic acid, tartaric acid, propionic acid, butyric acid, oxalic acid, malonic acid, succinic acid, glutaric acid, maleic acid, fumaric acid, citric acid, gluconic acid, adipic acid, pimelic acid,
1 carbon atoms such as suberic acid, azelaic acid, sebacic acid, etc.
And a salt of an alkali metal such as sodium or potassium, an alkaline earth metal such as magnesium or calcium, or a basic compound such as ammonia. Among these, as salts of carboxylic acids having a relatively small molecular weight, for example, formic acid, acetic acid, lactic acid, malic acid,
Salts of carboxylic acids such as propionic acid, butyric acid, oxalic acid, malonic acid, maleic acid, citric acid and sodium, potassium, magnesium, calcium or ammonia are particularly preferably used.

The water-soluble polyhydric alcohol used as one of the component a in the present invention is sorbitol, sorbitan, mannitol, mannitol, inositol, ethylene glycol, propylene glycol, Examples thereof include polyhydric alcohols having 1 to 6 carbon atoms such as diethylene glycol, glycerin, erythritol, pentaerythritol, and arabitol. Among these, sorbitol and ethylene glycol, which have relatively high solubility in water,
, Propylene glycol, diethylene glycol, glycerin and erythritol are particularly preferably used.

In the present invention, the above-mentioned carboxylic acid salt and a water-soluble polyhydric alcohol are mixed and used as the component a. The proportion of the carboxylic acid salt in the mixture is 5%.
% To 95% by weight, preferably 5 to 90% by weight, and the proportion of the water-soluble polyhydric alcohol is 95 to 5% by weight, preferably 95 to 5% by weight.
The content is preferably set to 10% by weight. Either too much or too little makes it difficult to obtain the highly improved fast-acting and long-lasting desired as a cryoprotectant.

The water-soluble polymer used as the component b in the present invention includes, for example, konnyaku mannan, pectin, sweet potato starch, potato starch, wheat starch, corn starch, soluble starch, carboxymethyl starch, seaweed, Agar, sodium alginate, troloi, gum arabic, dextrin, levan, glue, gelatin, casein, collagen, methylcellulose, carboxymethylcellulose, hydroxyethylcellulose, polyethylene glycol, polyvinyl alcohol, And polyglycerin.

Other water-soluble polymers include acrylic acid, methacrylic acid, maleic anhydride, acrylamide, methacrylamide, dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate, styrene, 1,4 A homopolymer or copolymer such as butadiene, or a polymer containing a carboxyl group in the molecule among these homopolymers or copolymers, and an alkali metal such as sodium or potassium, or an alkali such as magnesium or calcium. Salts with basic compounds such as earth metals and ammonia are mentioned.

In the present invention, the amount of the component (b) composed of the water-soluble polymer is the amount of the above-mentioned component (b) per 100 parts by weight of the component (a) composed of the mixture of the salt of the carboxylic acid and the water-soluble polyhydric alcohol. The components are present in an amount of 0.001 to 20 parts by weight, preferably 0.01 to 15 parts by weight. If the amount of the component (b) is less than 0.001 part by weight, the durability as a deicing agent will be poor, and if it is more than 20 parts by weight, it will be difficult to diffuse when sprayed, and lack in immediate effect.

The inorganic substance used as the component c in the present invention is at least one selected from the group consisting of silica gel, alumina gel, sodium silicate and potassium silicate. It may be hot. The amount used is c per 100 parts by weight of component a, which is a mixture of the carboxylic acid salt and a water-soluble polyhydric alcohol,
0.001 to 20 parts by weight of components, preferably 0.005
１５15 parts by weight. If the amount of the component (c) is less than 0.001 part by weight, the durability as a deicing agent will be poor.

The antifreezing agent of the present invention comprises, as an active ingredient,
It is characterized in that the above components b and c are added in the above ratio to the above component a.
Usually, these components a to c are sprayed as an aqueous solution in which water is dissolved. The amount of water used is the total amount 1 of the above-mentioned components a to c.
25 to 450 parts by weight, preferably 5 to 100 parts by weight
The content is preferably 0 to 400 parts by weight. If the amount of water used is too small, it lacks the immediate effect, and if it is too large, on the other hand, the durability is poor.

The aqueous solution of the anti-freezing agent thus prepared is applied to a road surface or the like during snowfall by using an appropriate sprayer or
It is excellent in that it is sprayed using a b and the like, and the road surface is quickly changed to a wet state in which water floats after spraying to prevent its freezing and that the antifreezing effect is maintained for a long time after the spraying due to the synergistic action of the components a to c. It is effective. The amount of application varies depending on the concentration of the components a to c, the weather conditions such as the temperature, and the road surface conditions.
g / m ² .

In the present invention, an aqueous solution of the above-mentioned antifreezing agent is used as a deicing agent for a road surface or the like when snow is present in order to obtain an excellent quick action and durability and an improved antislip effect. It is desirable to use a granular material impregnated in the powder. By spraying the granules on the road surface or the like with a powder sprayer or a hand spreader so as to have a weight of usually 50 to 200 g / m ² , the above-mentioned excellent effect is exhibited.

The porous substance used here is gravel, crushed stone,
It is at least one selected from shells, perlites, vermiculite, pumice, zeolite, diatomaceous earth, peat, charcoal and activated carbon, and has a particle size of 0.1 to 10
Those in the range of mm are selected and used. If the particle size is too small or too large, good results are hardly obtained in the antifreezing effect, in particular, the durability and the antislip effect.

In impregnating such a porous substance with an aqueous solution of the above-mentioned antifreezing agent, the amount of the aqueous solution used is 5 to 100 parts by weight, preferably 10 to 100 parts by weight, per 100 parts by weight of the porous substance. It is preferable that the amount be 85 parts by weight. If the amount is too small, the durability will be poor. On the other hand, if the amount is too large, the liquid will not be completely absorbed and dripping occurs. The method of impregnation is not particularly limited, and the porous substance and the aqueous solution of the antifreeze may be simply stirred and mixed, or may be treated under reduced pressure to bring the aqueous solution of the antifreeze into the pores of the porous substance. May be forcibly inhaled.

[0022]

Next, an embodiment of the present invention will be described in more detail. Hereinafter, “parts” means “parts by weight”.

Example 1 As component a, 10 parts of potassium oxalate, 40 parts of sorbitol, and 49.49 parts of propylene glycol were used. With respect to the component a, 0.01 parts of polyethylene glycol (average molecular weight 11,000) as the component b;
0.5 part of potassium silicate was added as a component to prepare an antifreezing agent. 100 parts of water was added to 100 parts of the antifreeze to prepare an aqueous solution of the antifreeze.

Example 2 As the component (a), 80 parts of sodium lactate and 17 parts of erythritol were used. For component a, 0.3 parts of casein as component b and alumina gel 2.7 as component c
Parts were added to give an antifreezing agent. This antifreeze 100
100 parts of water was added to each part to prepare an aqueous solution of an antifreezing agent.

Example 3 As the component (a), 64.9 parts of sodium acetate and 30 parts of glycerin were used. For component a, 5 parts of a cone starch as component b and silica gel 0.1 as component c
Parts were added to give an antifreezing agent. This antifreeze 100
100 parts of water was added to each part to prepare an aqueous solution of an antifreezing agent.

Example 4 As the component (a), 88.4 parts of potassium acetate and 10 parts of inositol were used. To this a component, 0.1 part of gum arabic as a b component and 1.5 parts of potassium silicate as a c component were added to prepare an antifreezing agent. 100 parts of water was added to 100 parts of the antifreeze to prepare an aqueous solution of the antifreeze.

Example 5 As the component (a), 40 parts of calcium / magnesium acetate were used.
47 parts of diglycerin were used. For this a component,
5 parts of polyvinyl alcohol (# 1000, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) was added as the component (b), and 8 parts of sodium silicate was added as the component (c) to prepare an antifreezing agent. 100 parts of water was added to 100 parts of the antifreeze to prepare an aqueous solution of the antifreeze.

Example 6 As the component (a), 49.45 parts of ammonium formate and 50 parts of ethylene glycol were used. For this a component,
0.5 part of sodium alginate as the b component and 0.05 part of silica gel as the c component were added to obtain a deicing agent. 100 parts of water was added to 100 parts of the antifreeze to prepare an aqueous solution of the antifreeze.

Example 7 As component a, 5 parts of potassium maleate and 94.945 parts of triethylene glycol were used. To this a component, 0.005 part of gelatin as a b component and 0.05 part of alumina gel as a c component were added to prepare an antifreezing agent. 100 parts of water was added to 100 parts of the antifreeze to prepare an aqueous solution of the antifreeze.

Example 8 As the component (a), 45 parts of trisodium citrate and 39.995 parts of diethylene glycol were used. In contrast to the component a, acrylic acid / acrylamide /
0.005 parts of a sodium salt of a copolymer of styrene (weight ratio: 1/1/1) and sodium silicate 1 as a component c
5 parts were added to obtain a deicing agent. This anti-freezing agent 10
100 parts of water was added to 0 parts to prepare an aqueous solution of an antifreezing agent.

Comparative Example 1 The amount of propylene glycol used in component a was 49.
An antifreeze and an aqueous solution thereof were prepared in the same manner as in Example 1 except that the amount was increased to 99 parts and 0.5 part of potassium silicate as the component c was not used.

Comparative Example 2 The procedure of Example 2 was repeated, except that the amount of erythritol in the component a was increased to 17.3 parts, and 0.3 part of casein as the component b was not used. An antifreeze and its aqueous solution were prepared.

Comparative Example 3 The same procedure as in Example 3 was carried out except that the amount of sodium acetate in the component a was increased to 94.9 parts and glycerin 30 part, which was another component a, was not used. An antifreeze and its aqueous solution were prepared.

Comparative Example 4 The amount of inositol used in component a was increased to 98.4 parts, and potassium acetate 88.4, another component a, was used.
A cryoprotectant and an aqueous solution thereof were prepared in the same manner as in Example 4 except that no part was used.

Comparative Example 5 Calcium / magnesium acetate alone was used as an antifreezing agent. 100 parts of water was added to 100 parts of the antifreeze to prepare an aqueous solution of the antifreeze.

Comparative Example 6 Propylene glycol alone was used as an antifreezing agent.
100 parts of water was added to 100 parts of the antifreeze to prepare an aqueous solution of the antifreeze.

Comparative Example 7 8 parts of lithium acetate, 90 parts of diethylene glycol and 2 parts of methylcellulose were mixed to prepare an antifreezing agent.
500 parts of water and 500 parts of ethanol were added to 100 parts of the antifreeze to prepare an aqueous solution of the antifreeze.

Comparative Example 8 Granules of calcium chloride were used alone as an antifreezing agent.

Using the aqueous solutions of the antifreezing agents of Examples 1 to 8 and Comparative Examples 1 to 7 and the antifreezing agent (particulates) of Comparative Example 8, a spray test was performed on an ice plate surface by the following method. Was carried out to evaluate the immediate effect and the sustainability. The results were as shown in Table 1.

<Spray test> In a container having a bottom of 10 cm square,
Add 250 ml of water, cover the container,
It frozen in the freezer of ° C, and produced the ice plate. 1 g of the aqueous solution of the antifreezing agent of Examples 1 to 8 and Comparative Examples 1 to 7 was dropped and pipetted on the ice plate, and 1 g of the aqueous solution of the antifreezing agent of Comparative Example 8 was manually drawn. After spraying, it was capped and put again in the freezer. Thereafter, the surface condition of the ice plate was observed, and the quick-acting effect and the sustainability were evaluated as follows.

<Evaluation of immediate effect> 10 minutes after application and 30 minutes after application
The surface condition of the ice plate after a lapse of one minute was observed, and the rapidity was evaluated based on the following criteria. ：: 10 minutes after spraying, the surface of the ice was wet and the water was floating. ○: 30 minutes after spraying, the surface of the ice was wet and the water was floating. ×: 30 minutes after spraying, the ice before spraying And almost no change

<Evaluation of Persistence> The surface condition of the ice plate was observed 1 hour, 2 hours and 4 hours after spraying, and the sustainability was evaluated according to the following criteria. ：: After 4 hours of spraying, the surface of the ice was moist and the water was floating. ○: Up to 2 hours after spraying, the surface of the ice was in a wet state and the water was floating. Until after the time, the surface of the ice is in a wet state and the water is in a floating state, but freezes thereafter. ×: Freezes within 1 hour after spraying

[0043]

As is clear from Table 1 above, Example 1
It can be seen that each of the antifreezing agents of Nos. To 8 exhibits an antifreezing effect excellent in quick action and durability on the ice plate surface.
On the other hand, Comparative Example 1 lacking the component c, Comparative Example 2 lacking the component b, Comparative Example 3 lacking the water-soluble polyhydric alcohol among the components a, and lacking the salt of the carboxylic acid among the components a Comparative Example 4
All of the antifreezes of the above are inferior in persistence.

Further, the antifreezing agent of Comparative Example 5 using only the salt of carboxylic acid is inferior in both immediate action and durability,
Further, the antifreezing agent of Comparative Example 6 using only the water-soluble polyhydric alcohol has an immediate effect but is inferior in sustainability. Furthermore, the antifreezing agent of Comparative Example 7, which was excessively diluted with water, was inferior in fast-acting efficiency and also inferior in persistence because it did not contain the component c. In addition, the antifreezing agent of Comparative Example 8 using the calcium chloride granules has a quick effect but is inferior in sustainability.

Example 9 Pearlite having a particle size of 1 to 3 mm was used as a porous substance. 100 parts of the perlite and 80 parts of the aqueous solution of the antifreezing agent prepared in Example 1 were placed in a container and treated under reduced pressure using an evaporator, so that the inside of the perlite hole was reduced. A granular material impregnated with the above aqueous solution was obtained.

Example 10 Activated carbon having a particle size of 3 to 5 mm was used as a porous substance.
100 parts of the activated carbon is put into a container, and 20 parts of the aqueous solution of the antifreeze prepared in Example 2 is dropped thereon, and the mixture is stirred so that the aqueous solution of the antifreeze is uniformly absorbed in the pores of the activated carbon. Thereby, a granular material was obtained.

Example 11 A mixture of pumice and crushed shells (particle size: 5
〜１０10 mm). The crushed shells were washed with water and dried before use. 100 parts of this mixture of pumice and crushed shells and 40 parts of the aqueous solution of the antifreezing agent prepared in Example 3 were placed in a container and treated under reduced pressure using an evaporator to obtain the mixture. A granular material in which the above aqueous solution was impregnated inside the hole was obtained.

Example 12 Vermiculite having a particle size of 2 to 4 mm was used as a porous substance. 100 parts of this vermiculite was put in a container, and the aqueous solution of the antifreezing agent prepared in Example 4 was placed thereon.
0 parts were added dropwise, and the mixture was stirred so that the aqueous solution of the above-mentioned antifreezing agent was uniformly absorbed into the pores of the vermiculite to obtain granules.

Example 13 A zeolite having a particle size of 0.5 to 2 mm was used as a porous substance. 100 parts of this zeolite and 70 parts of the aqueous solution of the antifreezing agent prepared in Example 5 were placed in a container and treated under reduced pressure using an evaporator, whereby the aqueous solution was placed inside the pores of the zeolite. The impregnated granules were obtained.

Example 14 Diatomaceous earth having a particle size of 0.1 to 0.5 mm was used as a porous substance. 100 parts of this diatomaceous earth is placed in a container, and 18 parts of the aqueous solution of the antifreeze prepared in Example 6 is dropped thereon, so that the aqueous solution of the above antifreeze is uniformly absorbed inside the pores of the diatomaceous earth. To obtain a granular material.

Example 15 Charcoal having a particle size of 3 to 10 mm was used as a porous substance. The charcoal was washed with water and dried before use. This charcoal 10
0 parts and 30 parts of the aqueous solution of the anti-freezing agent prepared in Example 7 were put in a container and treated under reduced pressure using an evaporator to impregnate the inside of the pores of the charcoal with the aqueous solution. A granular material was obtained.

Example 16 Vermiculite having a particle size of 0.5 to 2.5 mm was used as a porous substance. 100 parts of this vermiculite was put into a container, and 50 parts of the aqueous solution of the antifreeze prepared in Example 8 was dropped thereon, and the aqueous solution of the above antifreeze was uniformly absorbed inside the pores of the vermiculite. By stirring as described above, a granular material was obtained.

Comparative Example 9 A granular material was obtained in the same manner as in Example 9 except that the particle size of pearlite, a porous substance, was changed to 20 to 40 mm.

Comparative Example 10 A granular material was obtained in the same manner as in Example 10, except that the particle size of activated carbon as a porous substance was changed to 0.05 mm or less.

Comparative Example 11 The particle size of the mixture of pumice, which is a porous substance, and crushed shells was 2
Except having changed to 0-30 mm, it carried out similarly to Example 11, and obtained the granular material.

Comparative Example 12 The particle size of vermiculite, a porous substance, was 15 to 25.
Except having changed to mm, it carried out similarly to Example 12, and obtained the granular material.

Comparative Example 13 A granular material was obtained in the same manner as in Example 13, except that the particle size of the porous substance zeolite was changed to 0.07 mm or less.

Comparative Example 14 The particle size of diatomaceous earth, which is a porous material, was 0.01 to 0.0
Except having changed it to 6 mm, it carried out similarly to Example 14, and obtained the granular material.

Comparative Example 15 Charcoal having a particle size of 20 to 50 mm was used as a porous substance.
This charcoal alone was used as a granular material as an antifreezing agent.

Comparative Example 16 Vermiculite having a particle size of 15 to 35 mm was used as a porous substance, and this vermiculite alone was used as a granule as an antifreezing agent.

The above Examples 9 to 16 and Comparative Examples 9-1
Using the granular material of No. 6 and the aqueous solution of the antifreezing agent of Comparative Example 7, the following spray test was performed on the snow-covered road surface to examine the antifreezing effect. The results were as shown in Table 2 below.

<Scattering test> After spraying on a snow-covered road surface (road surface condition: slippery snow-covered road surface) so that the spray amount becomes 115 g / m ² , after 30 minutes and 24 hours, the coefficient of sliding friction was determined by the following method. Was measured to determine slipperiness, and the road surface condition was visually observed. The weather conditions (air temperature) in this test were −7 ° C. during spraying, −7.2 ° C. 30 minutes after spraying, and −8.5 ° C. 24 hours after spraying.

<Measurement of Sliding Friction Coefficient>
"G-analyst" (Valentis Rese
Arch Inc.) and 3
The vehicle was driven at 0 km / hour, and the frictional force between the road surface and the tire when sudden braking was applied was measured. The larger the value, the greater the friction between the road surface and the tires, which means that the brakes are easier to brake, that is, the wheels are less slippery.

<Judgment of slipperiness> The following criteria were used to evaluate the measured slip friction coefficient. 1: Sliding friction coefficient is less than 0.30, slippery (easy to slip) 2: Sliding friction coefficient is 0.30 to less than 0.42, relatively slippery (slip is difficult) 3: Sliding friction coefficient is 0.42 or more, non-slip

<Observation of Road Surface Condition> Visually, the following criteria ("Snow and Countermeasures", 95-96, Economic Research Committee, cited)
Was evaluated. ×: Smooth pressed snow surface △: Bumpy ice surface ○: Shear-bet road surface ◎: Crumpy road surface

<Comprehensive evaluation> From the judgment of slipperiness and the observation of the road surface condition, the quick effect was obtained from each result after 30 minutes, and the sustainability was obtained from each result after 24 hours. Comprehensive evaluation. ×: There is at least one third or lower evaluation from the best ○: There is at least one evaluation from the best ◎: All evaluations are the best

[0068]

As is clear from Table 2 above, the granular materials of Examples 9 to 16 in which a porous material having a specific particle size is impregnated with an aqueous solution of a deicing agent are sprayed on a snow-covered road surface. It can be seen that by increasing the coefficient of sliding friction of the road surface, it is possible to obtain a slippery road surface or a sheer road surface which is less slippery, and has excellent quick action and sustainability, and can exhibit a large slip prevention effect.

On the other hand, in the granular materials of Comparative Examples 9 to 14 in which the particle size was too small or too large as the porous material impregnated with the aqueous solution of the antifreezing agent, Although the effect of preventing freezing is recognized, the durability is poor, and the effect of preventing slip cannot be exhibited for a long period of time. In addition, in the granules of Comparative Examples 15 and 16 using only a porous substance having a large particle size, the initial freezing prevention effect was not sufficient, and good persistence was not obtained. Further, when the aqueous solution of the antifreezing agent of Comparative Example 7 was sprayed, there was almost no difference from the case of non-spraying.

[0071]

As described above, the present invention uses a mixture of a specific carboxylic acid salt and a water-soluble polyalcohol, further comprising a water-soluble polymer, silica gel, alumina gel, sodium silicate and the like. And at least one selected from potassium silicate to form a deicing agent, and an aqueous solution of the deicing agent is impregnated into a porous substance having a specific particle size to form a granular material. It is possible to provide an antifreezing agent having excellent anti-slip effect and excellent granularity, which is excellent in quick action and sustainability.

Claims (2)

[Claims] 1. A mixture 1 of a salt of a carboxylic acid having 1 to 10 carbon atoms and a water-soluble polyhydric alcohol having 1 to 6 carbon atoms.
00 parts by weight, b) 0.001 to 20 parts by weight of a water-soluble polymer, and c) at least one selected from silica gel, alumina gel, sodium silicate and potassium silicate.
An antifreezing agent characterized by adding 0.001 to 20 parts by weight of various inorganic substances. 2. Gravel, crushed stone, shell, perlite, vermiculite, pumice, zeolite, diatomaceous earth, peat,
A porous substance comprising at least one selected from charcoal and activated carbon and having a particle size of 0.1 to 10 mm,
A granular material impregnated with the aqueous solution of the antifreezing agent according to claim 1.