Means for removing ice on the basis of acetate and/or formate and method of melting snow and ice on road surfaces with this tool

 

(57) Abstract:

The described means for removing ice consists mainly of (a) 87 - 99,45 wt. % of alkali metal acetate or formate of an alkali metal, or mixtures thereof, b) 0.5 to 10 wt.% silicate of an alkali metal and (C) 0.05 to 3 wt.% phosphate of an alkali metal. It can be used in solid form (powder, granular or similar) or in the form of an aqueous solution. Describes how to melt ice and snow on road surfaces with an effective amount of the proposed tools in solid form or in aqueous solution. The technical result - the provision of short time thawing and corrosion protection, in particular in relation to magnesium. 2 S. and 2 C.p. f-crystals, 1 table.

The invention relates to a tool for removing ice on the basis of the acetates of alkali metals, alkali metal formate or a mixture of both of them for the road surface. The invention also relates to a method of melting snow and ice on road surfaces when using this tool.

Snow and/or ice on roads, cycle tracks, footpaths, bridges, playgrounds, airports, etc., (hereinafter called the road surface) is largely wliaa such surfaces should be applied to the means for melting or thawing snow and ice.

Requirements that must be performed by a means for removing ice, very versatile. The materials from which are constructed the surface in question, for example concrete, must not be damaged or even destroyed due to the impact of the means for removing ice. It is essential, then, that there must be no impact on the metals causing corrosion. Because the tool can get into the waste water, a further requirement is the biological destruction. It is important, then, to the thawing was achieved very quickly. From an economic point of view it is necessary, finally, to require only a small amount to remove ice and that it was inexpensive.

In the prior art described as a means for removing ice numerous salts of alkaline and alkaline-earth metals of inorganic and organic acids, for example, sodium chloride, potassium chloride, sodium formate, calcium formate, sodium acetate, magnesium acetate, sodium lactate, etc. These tools to remove ice, in particular a formate and acetate, just perform many of the above requirements, leaving much to be desired in respect to corrosion. They act primarily on legiate for vehicles as, for example, cars, motorcycles, airplanes, etc.

Already attempted to solve the problems mentioned above by using inhibitors. For example, in European patent EP-A 0375214 described liquid for removal of ice, which consists mainly of 45-60 wt.% acetate of an alkali metal and/or alkali metal formate, 0.1 to 0.4 wt.% phosphate of an alkali metal, 0.2 to 0.6. % nitrate of an alkali metal and water in the form of residual amounts to 100 wt.%, the weight percentages are given relative to the weight of the means for removing ice. Inhibitory effect of phosphate of an alkali metal and nitrate of an alkali metal leaves is, however, still much to be desired, especially in relation to magnesium; the disadvantage is the content of nitrite.

In the Federal Republic of Germany patent DE-A 4034217 describe liquid or solid tool for removing ice based on water-soluble formic acid salts of alkali metals and/or acetic acid salts of alkali metals and inhibiting system against corrosion consists of water-soluble polycarboxylic acids and water-soluble silicates, ammonium or alkali metal and/or ammonium carbonates and/or alkali metals. It does not contain chloride and nitrite tool for removing ice there should outerelo, as, for example, iron, copper, aluminum or zinc. Anti-corrosive action is based on a combination of water-soluble polycarboxylic acids, such as succinic acid, citric acid or tartaric acid, and water-soluble silicate and/or carbonate. In the case of light metals, it also leaves much to be desired.

There are also U.S. patent US F 4803007, describe where the means for removing ice on the basis of sodium chloride, as a corrosion inhibitor, a mixture of salts of divalent metal and an alkali metal polyphosphate. As divalent metals, among others, referred to as calcium, magnesium and barium, and the counterion - borates, metasilicate and sulfates. This combination of inhibitors counteracted primarily corrosion of metals based on iron, to a lesser extent, however, the corrosion of light metals, such as magnesium.

It was found that a mixture of phosphates of alkali metals and alkali metal silicates is a particularly effective inhibitor of the corrosion of light metals for tools to remove ice on the basis of formic acid and/or acetic acid salts of alkali metals.

The tool according to the invention consists of the foundations of the and,

b) 0.5 to 10 wt.%, preferably 2-7 wt.% silicate of alkaline metal and

C) 0.05 to 3 wt.%, preferably, 0.1 to 1 wt.% phosphate of an alkali metal.

Component a) is preferably a formate of an alkali metal. Of water-soluble alkali metal formate, and acetates of alkali metals preferred formate and acetates of sodium and potassium. Component (a) is, thus, preferably formate, sodium and/or potassium formate.

Component b) is a water-soluble alkali metal silicate, with an alkaline metal is again the sodium or potassium. The relevant authorities are orthosilicate (mono-, di-, tri - and tetraoninae), disilicate to tetrasilicate and/or water-soluble metasilicate, which is preferable.

Component C) is a water-soluble phosphoric acid salt of an alkali metal. It can be one-, two - or rejonowy phosphate of an alkali metal, and alkaline metal is preferably sodium or potassium.

Obtaining means for removing ice according to the invention is carried out by mixing the liquid and solid components. Means for removing ice Mora. Number three, or, if appropriate, further suitable components in aqueous media to remove ice (total concentration) can be changed within wide limits. It depends primarily on the solubility of the components in the water (you should have mostly clear solution). When using concentrated solution requires fewer to thaw the ice and/or snow than the less concentrated solution. The preferred concentration is in accordance with that from 15 to 70 wt.%, preferably 25-60 wt. % relative to the weight of the solution. The pH of the water means for removing ice is in the range 7-10. As mentioned, the pH after mixing of the components is not always corresponds to the specified values, it set at the desired value with the help of additives, preferably alkali metal hydroxide, such as sodium hydroxide or potassium.

The method according to the invention for melting snow and ice on the road surface differs in that an effective amount of the described means for removing ice (in solid or liquid form) applied to be processed from the road surface, i.e., such amount, the atmospheric temperature and available quantities of ice and/or snow and is in General 10-100 g / m2the surface is covered with ice and/or snow. The coating liquids for the removal of ice can be realized, for example, using a conventional spraying vehicles.

The tool according to the invention has several advantages. For example, it performs the mentioned first and requirements along with a reduced time of thawing has also, in an unexpected way, high any abscopal properties against corrosion of metals, in particular magnesium. This is obviously the result of a combination of these phosphates and silicates respectively in a certain amount and the fact that this system inhibitors are highly effective in the case of acetates of alkali metals and/or alkali metal formate. Means for removing ice according to the invention does not contain chlorides, nitrides and also particularly suitable for surfaces airfield fields, such as, for example, the starting track and track landing, Parking areas, bus routes, etc., It is used preferably in solid form (powder, granules, grains, etc).

The invention is illustrated further by the examples according to the invention and the examples for comparison.

shall I compare made by mixing the components. The percentages of the number of separate components represent weight percent.

Example 1

97.8% of sodium formate

to 2.0% of sodium silicate

0.2% tribalista

Example 2

92,0% potassium formate

7,0% sodium metasilicate

1,0% tribalista

Example 3

90.0% of sodium formate

8.0% metasilicate potassium

2,0% tribalista

Example 4

96.5% of sodium formate

0.5% sodium metasilicate

3,0% trisodium phosphate

Example 5

87,0% of sodium formiate

10,0% sodium metasilicate

3,0% acidic discalificata

The example for comparison 1

97.8% of sodium formate

2,0% metasilicate calcium

0.2% tribalista

The example for comparison 2

99.0% sodium formate

0.5% sodium metasilicate

0.5% of citric acid

The example for comparison 3

97.8% of sodium chloride

2,0% metasilicate calcium

0.2% tribalista

Means for removing ice according to examples 1-5 and examples 1-3 were tested against corrosion of magnesium. The tests were carried out in accordance with ASTM F483 (ASTM - American Society for Testing and Materials). While suspended, the samples were dipped for 24 cmolina pressure, then again determine its weight. The result of the corrosion test is given as the difference between the weights of both definitions of weight in milligrams per cm2the sample for 24 hours. The test was performed with magnesium AMS 4375 (chromated) and 15 wt.%-tion aqueous solutions of these tools to remove ice. The results are summarized in the table below and show that the means for removing ice according to the invention have high any abscopal properties against corrosion of magnesium. As for time defrost tool for removing ice according to the invention, it meets the requirements of the rapid thawing of ice and snow. Means for removing ice according to the invention have thus unexpectedly high any abscopal properties against corrosion of magnesium and required short defrost time.

1. Means for removing ice consisting of alkali metal acetate or formate of an alkali metal or mixture of alkali metal silicate and phosphate of an alkali metal, characterized in that it is a composition with the following weight ratios: (a) 87 - 99,45 wt.% the alkali metal acetate or formate of an alkali metal or mixtures thereof; b) 0.5 to 10 masisa fact, it consists mainly of (a) 92 - 97,9 wt. % of alkali metal acetate or formate of an alkali metal or mixtures thereof; b) from 2 to 7 wt.% silicate of an alkali metal and b) 0.1 to 1 wt.% phosphate of an alkali metal.

3. Means under item 1 or 2, characterized in that component a) is an alkali metal formate, component b) is metasilicate and component C) is a one-, two - or rejonowy phosphate of an alkali metal.

4. The way to melt ice and snow on the road surface by the means for removing ice consisting of alkali metal acetate or formate of an alkali metal or mixture of alkali metal silicate and phosphate of an alkali metal, characterized in that an effective amount to remove ice under item 1 in solid form or in aqueous solution applied to the surface of roads.

 

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