Low-temperature glass-cleaning liquid

FIELD: chemistry.

SUBSTANCE: liquid contains the following in wt %: isopropyl alcohol 10-30, ethyl carbitol 2-10, nonionic surfactant 0.01-0.10, polyatomic alcohol 0.02-0.10, substance, water - the rest. The polyatomic alcohol is preferably glycol and the amino alcohol is triethanolamine.

EFFECT: low freezing point of aqueous solutions of isopropyl alcohol, high cleaning power, low total content of low-temperature ingredients and cost of the product.

3 cl, 2 tbl, 2 ex

 

The invention relates to detergent compositions intended for cleaning hard surfaces, including glass.

In household products recently, in connection with the introduction of excise duties on technical and denatured ethyl alcohols, began to use isopropyl alcohol. Although isopropyl alcohol yields ethyl alcohol toxicity (3 hazard class), corrosion (corrosion activity is higher than that of ethanol), has an unpleasant smell, it is only accessible to the solvent for use in the automotive mild cleaning low-temperature liquids and other household products.

However, compared to ethanol, to provide the same freezing point of an aqueous solution, a higher concentration of isopropyl alcohol. To ensure the freezing temperature of minus 25C to minus 30C, isopropyl alcohol will require approximately 10-15% more.

For the purpose of lowering the freezing point of aqueous solutions of isopropyl alcohol it is advisable to introduce low-temperature components.

Known composition for cleaning glasses (EN 2051957 C1, 1992), including non-ionic surfactant (nonionic surfactants), polyhydric alcohol, isopropyl alcohol and water in the following ratio component is in, wt.%:

The nonionic surfactants1-10
Polyhydric alcohol25-40
Isopropyl alcohol10-25
Waterrest

As a polyhydric alcohol use ethylene glycol or diethylene glycol.

To ensure a low freezing temperature of this composition with the content of isopropyl alcohol in amounts of 10-25 wt.% requires the introduction of a large number (25-40 wt.%) polyhydric alcohol (ethylene glycol or of diethylene glycol), i.e. the total content of the low-temperature component is 35-65 wt.%.

This composition is an effective cleaning agent. However, using it as a glass cleaning liquid for automotive glass associated with such a disadvantage, as the closing of visibility through the glass due to the formation of a large amount of foam and oily incrustations on the glass, due to the presence in the composition of the significant content of the nonionic surfactants and polyhydric alcohol.

The present invention is to develop a low-temperature a mild cleaning fluid on the basis of isopropyl alcohol, devoid of the disadvantages of the prototype is Hanks additional content ethylcarbitol, that allows you to significantly reduce the content in the composition of nonionic surfactants and polyhydric alcohol and extend the application of this fluid.

According to the invention offers a low-temperature a mild cleaning fluid, including isopropyl alcohol, polyhydric alcohol, nonionic surfactant and water, further comprises ethylcarbitol in the following ratio of ingredients, wt.%:

isopropyl alcohol10-30
ethylcarbitol2,0-10,0
nonionic surfactant0,01-0,10
polyhydric alcohol0,02-0,10
waterthe rest of it.

Mostly liquid additionally contains aminoplast in an amount of 0.01-0.03 wt.%, the odorant in the amount of 0,02-0,20 wt.% and the dye amount is 0.0002-0,0006 wt.%. As the polyhydric alcohol, it is advisable to use a glycol (ethylene glycol, diethylene glycol, propylene glycol and others), as amerosport - triethanolamine.

When the above total content of isopropyl alcohol and ethylcarbitol (12-40 wt.%) tempera is ur freezing a mild cleaning fluid is from minus 7C to minus 40C. To ensure the specified temperature freezing liquid without ethylcarbitol would require from 14 to 68 wt.% isopropyl alcohol.

Nonionic surfactants improves the wetting and cleaning ability of the liquid. At concentrations of nonionic surfactants above 0.1% efficiency of the nonionic surfactants is not increased. Therefore, increasing the concentration of nonionic surfactants more than 0.1% wt.% it is impractical.

Polyhydric alcohol in this structure performs the function of a softening agent, eliminating the squeak of the wipers.

Amerosport helps eliminate corrosion effect of isopropyl alcohol on the paint coating, rubber parts and metal parts of car's body.

Know the use of ethylcarbitol in the media (Barannik VP, Maryniuk BT, Ovcharenko B.C., Athos VP New coolant, features and prospects of application. The refrigeration business, 2001, No. 1. Ethylcarbitol).

Thus ethylcarbitol in aqueous solutions with concentrations up to 10 wt.% not effective; when the concentration of ethylcarbitol 30 wt.% the freezing point of water is reduced by only 5, i.e. the freezing point of an aqueous solution of ethylcarbitol with a concentration of 30% wt. is only minus 5C.

Unexpectedly it has been found that aqueous solutions of isopropyl alcohol effectiveness of ethylcarbitol by freezing point depression is significantly higher.

When introduced into an aqueous solution of isopropyl alcohol (with a concentration of 10-30 wt.%) ethylcarbitol in the amount of only 5 wt.% the freezing point of the solution is reduced by 2-10C, with the introduction of 10% ethylcarbitol - 5-15C (in the same range of concentrations of isopropyl alcohol).

Introduction in an aqueous solution of isopropyl alcohol ethylcarbitol in amount less than 5 wt.% ineffective, more than 10 wt.% - impractical because the effectiveness of lowering the freezing temperature of the solutions with increasing content of ethylcarbitol falls.

The freezing point depression of aqueous solutions of isopropyl alcohol with the introduction of ethylcarbitol up to 10% more efficiently than the introduction of the same amount of other cooling liquids: ethanol, methanol, alcohols, glycerol, glycols (ethylene glycol, diethylene glycol, propylene glycol).

The melting point of ethylcarbitol (minus 78C) higher than that of isopropyl alcohol (minus 89,5C). Therefore, the effect of ethylcarbitol can be explained by the decrease of interaction between molecules of isopropyl alcohol, which leads to the lowering of the freezing temperature.

To achieve the same freezing temperature with the introduction of ethylcarbitol to reduce the total concentration of antifreeze ingredients in aqueous solution (table 1).

Table 1
The freezing point of an aqueous solution, C Mass fraction in aqueous isopropyl alcohol solution with ethylcarbitol, %The total mass fraction in aqueous isopropyl alcohol solution with ethylcarbitol, %
Mass fraction of ethylcarbitol. %
2,55,07,510,0
Minus 1524242426,527
Minus 162725,52526,528
Minus 203428,5283030
Minus 2545343233,534
Minus 2849373536 36

Table 2 shows the freezing point of aqueous solutions of isopropyl alcohol with the introduction of ethylcarbitol from 2.0 wt.% up to 10 wt.%.

Table 2
Mass fraction of isopropyl alcohol, %The freezing point of the solution, C, when the content in the solution ethylcarbitol, wt.%
02,55,07,510,0
10minus 4,5minus 6minus 6,5minus 7minus 9
15minus 8minus 9minus 10minus 11minus 12
20minus 11minus 13minus 16minus 17minus 20
22minus 13 ----
25minus 15minus 19minus 23minus 25minus 27
27,5minus 17----
30minus 18minus 24minus 28minus 30minus 40
34minus 20----
40minus 24----

As follows from the results in table 2, with the introduction of ethylcarbitol total concentration of isopropyl alcohol and ethylcarbitol (to achieve the same freezing temperature) is less than the concentration of isopropyl alcohol in the solution without the adding the ethylcarbitol.

Corrosivity a mild cleaning fluid by reducing the concentration of isopropyl alcohol also decreases.

The optimal concentration of ethylcarbitol 5 wt.%, providing a minimum total content of antifreeze components in aqueous solution.

In other cases, the amount of introduction of the solution ethylcarbitol will be determined by the ratio of prices of isopropyl alcohol and ethylcarbitol.

Low-temperature mild cleaning liquid does not emit toxic products that are safe for the environment.

The cleaning ability of low-temperature mild cleaning liquid is not less than 98%.

Low-temperature mild cleaning fluid does not foam when washing the glass, not left on the glass of stains, films.

The mixture of ingredients is performed at room temperature.

Example 1. To prepare 500 kg of low-temperature a mild cleaning fluid in 389,7 kg (77,94 wt.%) water poured 100 kg (20 wt.%) isopropyl alcohol, 10 kg (2 wt.%) ethylcarbitol, enter 0.05 kg (0.01 wt.%) The nonionic surfactants (neonol), 0.1 kg (0.02 wt.%) of ethylene glycol, 0.05 kg 90,01 wt.%) triethanolamine, 0.1 kg (0.02 wt.%) odorants and 1 g (is 0.0002 wt.%) the dye. The solution is stirred for 10-15 minutes a Solution of a homogeneous, transparent. The freezing temperature of minus 14C. the cleaning ability of 98%. On the Windows of a car does not leave razvod is, films etc.

Example 2. To prepare 500 kg of low-temperature a mild cleaning fluid 298 kg (59,6 wt.%) water poured 150 kg (30 wt.%) isopropyl alcohol, 50 kg (10 wt.%) ethylcarbitol, enter 0.5 kg (0.1 wt.%) the neonols (nonionic surfactants) and ethylene glycol, 0.15 kg (0.03 wt.%) triethanolamine, 1 kg (0.2 wt.%) odorants and 3 g of dye. The solution is stirred for 10-15 minutes a Solution of a homogeneous, transparent. The freezing temperature of minus 32C. the cleaning ability of 99.8 per cent. On the Windows of cars doesn't leave stains, films, etc.

Similar results are obtained when using as polyhydric alcohols other glycol: diethylene glycol, propylene glycol, and also in the absence of the target additives - amerosport, perfume and dye.

Low-temperature mild cleaning fluid is environmentally safe, has a high detergent properties, leaves on the glass stains and films, does not form a foam when washing the glass, does not damage the paintwork of the car body, does not cause corrosion of the metal and rubber components and can be used as a mild cleaning liquid and cleaning agent.

The presence of ethylcarbitol leads to the freezing point depression of aqueous solution of isopropyl alcohol, to reduce the total content of the low-temperature ingredients in the composition and to reduce the cost ol the product.

1. Low-temperature mild cleaning fluid, including isopropyl alcohol, polyhydric alcohol, nonionic surfactant and water, characterized in that it further comprises ethylcarbitol in the following ratio of ingredients, wt.%:

isopropyl alcohol10-30
ethylcarbitol2,0-10,0
nonionic surfactant0,01-0,10
polyhydric alcohol0,02-0,10
waterrest

2. Liquid according to claim 1, characterized in that it further comprises aminoplast in an amount of 0.01-0.03 wt.%, the odorant in the amount of 0,02-0,20 wt.% and the dye amount is 0.0002-0,0006 wt.%.

3. Liquid according to claim 2, characterized in that as a polyhydric alcohol it contains glycol, and amerosport - triethanolamine.



 

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