KR100448723B1 - Frost-melting and frost-preventing composition - Google Patents

Abstract

The present invention utilizes the property that methanol, ethanol, isopropanol, ethylene glycol, diethylene glycol, propylene glycol and the like have a polarity similar to that of water to easily dissolve the frost, thereby dissolving and removing the frost formed on the window glass. The present invention relates to a composition having so-called defrosting and anti-frosting function that prevents frost from being pre-sprayed on a window glass by using the characteristics of the freezing point and the high boiling point of other alcohols except methanol in the lower alcohol. When used alone or in an aqueous solution, it is the most economical composition, but the low boiling point of methanol, that is, volatilization, the remaining water immediately after volatilization after elution, ethanol, isopropanol, Ethylene glycol, diethylene glycol, propylene glycol and the like one or more, or one The mixture of two or more in methanol at an appropriate ratio is used to remove frost well, and when methanol is contained, ethanol, isopropanol, ethylene glycol, diethylene glycol, propylene glycol, or a mixture of methanol is evaporated for several hours or more. Not only do not refreeze due to the composition of the mixture, but also pre-sprayed on the window glass, due to the coating on the surface of the glass formed of a composition of ethylene glycol, diethylene glycol, propylene glycol, or mixtures thereof, It is characterized by preventing the freezing of.

Description

Frost-melting and frost-preventing composition

The present invention relates to a defrosting and prevention composition, and more particularly, so-called 'frost', which includes ice, frost, snow, etc., generated in the window glass in winter, solubilizes well and does not freeze itself. In both cases, the composition may be composed of one or two or more of low-temperature boiling alcohols having 2 to 4 carbon atoms, that is, ethanol, ethylene glycol, diethylene glycol, isopropanol, and propylene glycol, having a function of preventing the occurrence of frost. It relates to a defrosting and prevention composition which is added by the addition of methanol, which is a low-boiling low-boiling alcohol in order to reduce the cost and promote solubility.

Conventionally, when frost occurs on an automobile window glass, it has been dissolved by engine heat generated by spraying hot water to dissolve or starting the automobile. In case of slight frosting, it is mixed with a small amount of surfactant and triazole, which is added to 22-28% methanol aqueous solution according to the industrial standard, and a winter washer solution with a melting point of minus 20 to 25 ° C is sprayed to improve the dissolving ability of methanol. It was also used to dissolve and remove the frost.

In this case, the methanol in the washer liquid having a boiling point of only 64.6 ° C. after dissolving the frost easily evaporates, and the dissolved water remains unvolatile and easily re-frozen, so that the frost cannot be removed without constantly spraying the washer liquid. There was this.

Accordingly, the present invention is provided to efficiently solve the problems of the prior art as described above, the object of the present invention is to prevent the re-freezing after dissolving the frost formed on the car window glass, etc., if it is sprayed in advance It is an object of the present invention to provide a defrosting and prevention composition that can prevent the occurrence of oxidant.

Defrosting and preventing composition according to the present invention in order to achieve the above object, comprises one or a mixture of two or more alcohols of 2 to 4 carbon atoms in methanol, ethanol, ethylene glycol, diethylene glycol, isopropanol, propylene glycol, It is characterized in that it comprises an alcohol selected from the group consisting of one or more of the alcohols containing one to two carbon atoms, namely 0.01 to 95% by volume of methanol, or a mixture containing two or more alcohols as a residual amount.

In addition, the defrosting and prevention composition is characterized in that it further comprises 1 to 5% by volume of a water-soluble water-repellent silicone oil containing hydroxydimethylsiloxane (Hydroxy-dimethylsiloxane).

In addition, the defrosting and prevention composition is characterized in that it further comprises 0.1 to 1.0% by volume cationic surfactant comprising cetyltrimethylammonium chloride.

Alcohols of each carbon number are very similar in their solubility characteristics, and alcohols of any composition can be used as defrosters and inhibitors because they can be used without significant defects in terms of freezing point and boiling point of other alcohols except methanol. While it has been found possible, it is more preferably configured to include an alcohol selected from the group consisting of isopropanol, ethylene glycol, diethylene glycol, propylene glycol or mixtures thereof.

The background is described in more detail, while methanol has a sufficiently low melting point, -96 DEG C and excellent dissolving ability, whereas volatility due to low boiling point causes a problem of re-freezing of dissolved water by volatilization immediately after dissolving in the castle. It cannot be a defroster or an inhibitor by itself.

On the other hand, ethanol and isopropanol have a melting point of -117 ° C and -89.5 ° C, respectively, which are sufficiently low that there is no refreezing factor, and the boiling points are 78.3 ° C and 82.4 ° C, respectively, which are considerably higher than methanol, so that they do not evaporate for several hours after melting the frost. The dissolved water does not re-freeze because it remains. Normally, the defrosting function is completed because the remaining water on the window glass is evaporated by the engine heat since the car starts to move after defrosting.

In addition, dihydric alcohols such as ethylene glycol and diethylene glycol are slightly inferior to methanol because their polarity is not as great as methanol, but the boiling point is 197.2 ° C and 244.3 ° C, respectively. As a result, it is possible to prevent frosting when sprayed onto the window glass in advance. However, if the freezing point is -13 ℃ and -6.5 ℃, respectively, it will freeze itself if it is below this temperature, so it cannot be used when the temperature is below freezing point, and even if it is below freezing point, dissolved water is used when dissolving frost by using these as a defrosting agent. Since the freezing point rises due to the formation of an aqueous solution, it is practically impossible to use even at a temperature considerably higher than the freezing point. For example, when ethylene glycol is used to dissolve in frost and an aqueous solution having a volume ratio of ethylene glycol: dissolved water of 1: 4 is formed, the freezing point changes to -13 × 0.2 = -2.6 ° C., so ethylene glycol is soluble after soluble in frost. Assuming that the water is diluted to about 1: 4 by distilled water, ethylene glycol cannot be used below -2.6 ° C instead of -13 ° C. On the same basis, diethylene glycol cannot be used below -1.3 ° C.

On the other hand, in the case of propylene glycol, the freezing point is -60 ℃ and boiling point is 187.4 ℃ is more preferable to use as the main material of defrosting and prevention agent. Since propylene glycol has a high boiling point, it may remain for several days after defrosting, and propylene glycol: even if soluble water forms an aqueous solution of 1: 4, its freezing point is -12 ° C. It was confirmed that it can be used as an anti-depressant. Using propylene glycol as a main ingredient and using it as a defrosting and preventing agent, it was confirmed that satisfactory results were obtained at the minimum temperature -12 ° C that can be experienced.

However, methanol had the highest dissolution rate, followed by isopropanol, followed by ethylene glycol.

Thus, the composition that prevents the formation of frost without evaporating and self-freezing when pre-spread on window glass while satisfying the requirement to improve the dissolution rate of the frost and not re-freeze for more than several hours after dissolution. As a result, it is most effective to use methanol in an amount of 30 to 80% by volume based on the total volume of the composition, and to use an alcohol selected from the group consisting of propylene glycol, ethanol, isopropanol, ethylene glycol, diethylene glycol, or mixtures thereof as the remaining amount. It was confirmed that.

However, alcohols having 4 or less carbon atoms are slightly different in application temperature except for the use of methanol alone or in combination, except for the use of methanol alone. It was confirmed that the removal agent can be used almost invariably, and the antifreeze agent has only a slight difference only at the optimum temperature for application, and there is almost no problem in general use.

Table 1 shows physical properties for alcohols having 4 or less carbon atoms, and Table 2 and Table 3 show examples of defrosting and preventing composition.

Freezing point (℃) Boiling point (℃) Methanol -96 64.6 ethanol -117.3 78.3 Ethylene glycol -13 197.2 Diethylene glycol -6.5 244.3 Isopropanol -89.5 82.4 Propylene glycol -60 187.4

Among the alcohols in Table 1, methanol has a very low freezing point and a greater polarity, so that the solvent has better solubility, and because the surface tension is small, the methanol penetrates well into the gap of the frost and accelerates the dissolution rate. There is a problem that dissolves and then volatilizes easily causing re-freezing of residual moisture.

Ethanol has a low freezing point, excellent solubility in water, and a high boiling point without significant difference with water, and does not immediately re-freeze because it coexists in an aqueous solution with water dissolved in the frost and for at least 1 hour. It is enough to use.

In particular, ethylene glycol has a slightly weaker dissolving ability than methanol or ethanol, but due to its high boiling point, the ethylene glycol does not evaporate due to coexistence with the water dissolved in the frost, and there is no re-freezing phenomenon of the dissolved water. It can be seen that frost does not form when sprayed in advance. However, since melting | fusing point is -13 degreeC, it is unsatisfactory at cold temperature. Therefore, ethylene glycol is suitable for use as a defrosting agent and an anti-depressant only at an air temperature of 0 ° C to -10 ° C.

Diethylene glycol has good dissolving ability to frost and excellent anti-frosting function due to high boiling point, but its melting point is so high that it is -6.5 ℃, so it cannot be used effectively because it has self-freezing defect at considerably higher temperature than -6.5 ℃. Can be used as defroster and inhibitor in temperature range.

Isopropanol has excellent solubility, low melting point, and boiling point is about 4 ° C higher than ethanol, so it can be advantageously used as a defrosting agent than ethanol.

In particular, propylene glycol has excellent solubility, low melting point, and relatively high boiling point of 187.4 ℃, it can be seen that it is the most excellent substance as defrosting and preventing agent.

Meanwhile, as described above, in addition to propylene glycol, which is the most excellent defrosting and preventing effect, methanol having excellent instantaneous dissolving power and isopropanol having intermediate characteristics of propylene glycol and methanol can be prepared, in which case the composition ratio More preferably 10 to 25 vol.% Isopropanol, 10 to 25 vol.% Propylene glycol and methanol as the balance. When the composition is sprayed on the frost formed on the window glass, it penetrates quickly into the frost gap due to the extremely low surface tension of methanol, and rapidly dissolves the frost by the rapid dissolving power of methanol. In the case of some thick frosts, spray them and wait for a while before moving the window wiper to remove the frost without touching it. After dissolving and removing the frost, methanol rapidly evaporates, but the remaining water does not re-freeze due to the remaining propylene glycol and isopropanol remaining in the dissolved state. Remains to the end to prevent refreezing. When the composition is sprinkled in the evening or when tea is left for a long time, methanol in the composition evaporates immediately and isopropanol evaporates as time passes, but very high propylene glycol forms a coating film on the glass, causing frost. Will be prevented.

When all or part of the isopropanol is replaced with ethylene glycol in the composition, the first cost reduction effect, the second is characterized by further enhancing the effect as an anti-frosting agent due to the high boiling point of ethylene glycol.

On the other hand, a water-repellent water-soluble silicone, including hydroxydimethylsiloxane (Hydroxydimethyl-siloxane) can be further used as an anti-adjuvant. If the water-soluble silicone is used in an amount of less than 1% by volume based on the total volume of the defrosting and preventing composition, the effect of sustaining the anti-frosting effect for a long time is insignificant, and when used in an amount of more than 5% by volume, the effect is proportionally improved. Do not. Therefore, the water-soluble silicon in the present invention is preferably included in an amount of 1 to 5% by volume based on the total volume of the composition. When the composition of the present invention containing the water-soluble silicone is sprayed on the window glass, the dew falling on the window glass in accordance with the drop in temperature does not get wet on the glass surface to form a drop of water to roll down and adds a distinct effect to the prevention of frost.

In addition, one or two or more cationic surfactants including cetyltrimethylammonium chloride (C ₁₆ H ₃₃ N (CH ₃ ) ₃ Cl) and the like may be added to the defrosting and preventing agent of the present invention to impart cleaning ability as well as water repellency. This can promote the action of collecting and letting water fall into the dew during the night. When the cationic surfactant is used in an amount of less than 0.1% by volume based on the total volume of the composition, glass cleaning and water repellency are insignificant, and when used in an amount of more than 1.0% by volume, a high viscosity film is formed on the glass surface to operate the wiper. There may be problems that interfere. Therefore, the cationic surfactant in the present invention is preferably included in an amount of 0.1 to 1.0% by volume relative to the total volume of the composition. The composition of the present invention comprising the cationic surfactant has the effect of enhancing the water repellent function to improve the anti-frosting function compared to the composition that does not include it, and also to enhance the surface tension reduction effect to enhance the function of the cleaning action of the glass surface do.

The defrosting and preventing composition having the above composition may be commercialized with an aerosol or a general trigger spray by filling a metal tube using LPG, DM or carbon dioxide as a propellant gas for injection.

Hereinafter, the defrosting and preventing compositions of Examples 1 to 12 and Comparative Example 1 will be described in more detail, but the present invention is not limited to these examples.

Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Example 5 Methanol 100 - - - - - ethanol - 100 - - - - Isopropanol - - 100 - - - Ethylene glycol - - - 100 - - Diethylene glycol - - - - 100 - Propylene glycol - - - - - 100

Example 6 Example 7 Example 8 Example 9 Example 10 Example 11 Example 12 Methanol 60 60 60 60 60 60 70 ethanol - - - - - - - Isopropanol - 15 - - - - - Ethylene glycol - - 15 - 25 23.8 13.8 Diethylene glycol - - - 15 - - - Propylene glycol 40 25 25 25 15 15 15 Hydroxydimethylsiloxane DC193 - - - - - One One Cetyltrimethylammonium chloride - - - - - 0.2 0.2

Methanol, ethanol, isopropanol, ethylene glycol, diethylene glycol, propylene glycol and other hydroxydimethylsiloxane DC193 (Hydroxy-dimethylsiloxane DC193, manufactured by Dow Corning, USA) as water-soluble water-repellent silicone, cetyltrimethylammonium chloride as cationic surfactant The defrosting and preventing compositions of Examples 1 to 12 and Comparative Example 1 were prepared by mixing to have a component content (vol%) as described in Table 2 and Table 3.

After defrosting and preventing composition prepared according to the conventional method to have the composition of Table 2 and Table 3 in the aerosol form in accordance with the conventional method, the car frosted in glass at a humidity of 70%, -5 ℃ temperature After sprinkling with the same amount as the test material, the ability to remove the frost, refreezing, etc. were tested to evaluate the ability to remove the frost and prevent the frost.

As a result, it was confirmed that Comparative Example 1 using methanol alone had only instantaneous dissolving power and evaporated after frosting to cause re-freezing.

On the other hand, Example 1 using ethanol alone did not immediately re-freeze because it takes 2 hours to dissolve the frost well and evaporate well. In addition, since the engine is moved to the vehicle after defrosting, the frost does not re-freeze due to the engine heat. After spraying it on the windshield and trying to prevent frost, after several hours after ethanol was sprayed, it was all evaporated and disappeared.

Example 2 using isopropanol alone had similar effects to Example 1. However, the evaporation time was only about 1 hour longer than ethanol.

In Example 3, in which ethylene glycol was used alone, the rate of dissolution to frost was slightly slow, but no re-freezing was performed even after 4 hours or more after dissolution. On the other hand, in order to test the anti-freezing function, it was sprayed in the evening and checked in the morning, and it was confirmed that the droplets were frozen on the window glass even when the temperature was about 10 degrees below zero, that is, slightly higher than the freezing point of ethylene glycol. This can be predicted that the dew freezing lowered the freezing point as the ethylene glycol was diluted.

In Example 4 using diethylene glycol alone, it could be confirmed that there was a similar tendency to Example 3, except that in the anti-frost test, drops were frozen at minus 4 ° C.

In the case of Example 5 using propylene glycol alone, the frost dissolution rate was slightly slower than that of methanol, but it did not refreeze even after 5 hours of dissolution, and it was sprayed in the evening and observed in the morning for anti-frost test. There was no frost at all, but dew or frost dissolved in the early evening dissolved in propylene glycol to form water droplets that did not freeze. Water droplets were easily removed by moving the wiper to clear the field of view, and in order to see the persistence of the defrosting effect, the propylene glycol was not washed by methanol by moving only the wiper without using a washer solution made of methanol. Valid for 3 days.

As a result of examining the dissolving power and anti-freezing ability of the composition of Examples 1 to 5, methanol has the best dissolving power due to its high dissolving power and penetration ability, but it is a problem that water remaining by evaporation and re-freezing immediately after removal is removed. It was found that ethanol and isopropanol required 2-4 hours to dissolve and evaporate the frost, which is very suitable for use as a defroster, but evaporated after 2-4 hours after spraying, so it was found to be somewhat unsuitable for use as an anti-frosting agent. Propylene glycol is the best as a defroster and an inhibitor, but it is expensive and tends to be somewhat inferior to methanol. However, the ethanol and propanol can be used alone or as a mixture of other alcohols as an anti-depressant, it was confirmed that more effective anti-detergent can be prepared by forming a mixture of methanol and alcohol. And there was no anti-frost function. And it was confirmed that the composition ratio is not a composition according to any specific ratio, and infinitely wide composition ratio can be used with a slight difference.

Thus, the inventors have used a high boiling point alcohol, that is, ethylene glycol, diethylene glycol, propylene glycol, or a mixture thereof with methanol, in order for the defrosting agent to have antidepressant ability, or methanol is ethanol, isopropanol, or It was concluded that it should be used with a mixture thereof, and the composition of Examples 6 to 12 of Table 3 was tested to determine the anti-sexual and anti-sexual ability.

In Example 6 in which methanol and propylene glycol were mixed in Table 3, the advantages of methanol and propylene glycol as defrosting agents or defrosting agents showed excellent properties as defrosting agents as well as defrosting agents. After defrosting, propylene glycol does not evaporate at winter temperature for a long time for at least one week, thus eliminating frost and preventing frost.

On the other hand, in Example 6 in which part of the propylene glycol is replaced with isopropanol in Example 6, isopropanol has the intermediate characteristics of methanol and propylene glycol and the price is somewhat lower than propylene glycol, the test results are carried out Similar to Example 6.

In Example 6, a part of propylene glycol was replaced with ethylene glycol, which was similar to propylene glycol but had a higher freezing point, and the same result as in Example 6 was generally obtained. It may be more desirable to limit the ratio because the ratio of ethylene glycol is too high or the temperature may be self-freezing at cryogenic temperatures of −12 ° C. or lower.

In Example 8 using diethylene glycol instead of ethylene glycol in Example 8, similar results were obtained in a limited range according to the freezing point difference.

In Example 8, when the ratio of ethylene glycol was increased to 25% and the ratio of propylene glycol was reduced to 15%, Example 10 used was not able to feel a difference at a temperature below -12 ° C.

In Example 10, in which hydroxydimethylsiloxane DC193, a water-soluble water-repellent silicone, and cetyltrimethylammonium chloride, a water-soluble cationic surfactant, were added, there was no difference in defrosting effect. The wiper movement was very smooth due to the lubrication of DC193 and cetyltrimethylammonium chloride. In addition, in the anti-frost test, the water-repellent effect was much smaller than the amount of water left in the glass in the morning.

In Example 11, the amount of ethylene glycol was reduced in Example 11, and the difference from Example 11 was not felt.

Through the above experiments, in order to impart anti-frosting function, it is more preferable that propylene glycol is essentially used, and ethylene glycol can be used instead of propylene glycol within a limited temperature range for some time.

In addition, ethanol and propanol, which have intermediate properties between methanol and propylene glycol, can be extensively formed into a co-composition, and ethylene glycol and diethylene glycol having properties close to propylene glycol can also be co-composed in a limited range. It was confirmed that it could be used.

As can be seen from the above, the defrosting and preventing composition of the present invention can remove the frost formed on the window glass during operation, which can contribute to the safe driving in winter, and by spraying on the window glass of the car after driving in advance This prevents the frost from forming until there is no need for troublesome defrosting before driving.

Claims (3)

A defrosting and preventing composition, comprising 0.01 to 95% by volume of methanol and a mixture with an alcohol selected from the group consisting of ethanol, ethylene glycol, diethylene glycol, isopropanol, propylene glycol, or mixtures thereof. The method of claim 1, Defrosting and preventing composition, characterized in that it further comprises 1 to 5% by volume of a water-soluble water-repellent silicone oil containing hydroxydimethylsiloxane (Hydroxydimethylsiloxane). The method of claim 1, Defrosting and preventing composition, characterized in that it further comprises 0.1 to 1.0% by volume cation surfactant comprising cetyltrimethylammonium chloride.