DE525316C - Means for thawing points - Google Patents
Means for thawing pointsInfo
- Publication number
- DE525316C DE525316C DE1930525316D DE525316DD DE525316C DE 525316 C DE525316 C DE 525316C DE 1930525316 D DE1930525316 D DE 1930525316D DE 525316D D DE525316D D DE 525316DD DE 525316 C DE525316 C DE 525316C
- Authority
- DE
- Germany
- Prior art keywords
- thawing
- salt
- crystallized
- chlorides
- points
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/18—Materials not provided for elsewhere for application to surfaces to minimize adherence of ice, mist or water thereto; Thawing or antifreeze materials for application to surfaces
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
Description
mittel zum Auftauen von Weichen Die Auftauwirkung von Salzen, insbesondere des billigen Chlornatriums (Viehsalz, Steinsalz), ist seit alter Zeit bekannt und wird in der Praxis vielfach angewendet. Gegen dieses an sich wirksame Mittel besteht indessen, insbesondere bei Anwendung zum Auftauen eiserner Gegenstände, wie z. B. Eisenbahnweichen und anderem, das Bedenken, daß die Lösung dieses Salzes wie die Lösung vieler anderer Chloride das Eisen stark korridiert, d. h. den natürlichen Rostprozeß erheblich fördert. In verstärktem Maße richten sich diese Bedenken gegen die hochlöslichen Chloride weniger stark basischer Metalle, als es die Alkalimetalle sind.means for thawing turnouts The thawing effect of salts, in particular the cheap sodium chloride (cattle salt, rock salt), has been known since ancient times and is widely used in practice. Against this in itself effective means exists however, especially when used to thaw iron objects, such as. B. Railway switches and other things, the concern that the solution of this salt like the Solution of many other chlorides which strongly corrode iron, d. H. the natural ones Significantly promotes rust process. These concerns are increasingly countered the highly soluble chlorides of less strongly basic metals than the alkali metals are.
Eingehende Versuche haben indessen gezeigt, daß Bedenken solcher Art gegen die Anwendung von wasserfreiem Chlormagnesium ungerechtfertigt sind, wenn zugleich die als Rostschutzmittel an sich bekannten Alkalichromate verwendet werden. Die Wirkung der letzteren ist nämlich überraschenderweise nicht nur bei löslichen Carbonaten, wie z. B. Pottasche nach Patent 480 484, sondern selbst bei den in hoher Konzentration der Lösung anfallenden Chloriden stark genug, um selbst bei Zusatz von nur etwa z°/" Alkalichromat das Rosten zu verhindern. Das anzuwendende wasserfreie, aus dem Schmelzfluß kristallisierte Chlormagnesium besitzt eine Anzahl Eigenschaften, die es dem Chlornatrium als Auftaumittel als weit überlegen erweisen. Das kristallisierte Salz wird durch Zerkleinerung in die Form feiner Schuppen gebracht von -zweckmäßig bis etwa 2 mm größter Länge. Der blättrige Bau begünstigt sowohl die Streufähigkeit des Pulvers wie insbesondere auch die Berührung mit den die Auflösung bewirkenden Schnee- oder Eisteilen. Die daraus folgende hohe Geschwindigkeit der Auftauwirkung wird außerdem gefördert durch einen besonders niedrigen Schmelzpunkt des Kryohxdrates des Chlormagnesiums und durch die Hydratationswärme, die den hohen Wert von 33 Cal/Mol. aufweist. Es bilden sich infolgedessen während des Auftauens niemals feste, die Verwendung behindernde Salzkrusten, wie das bei anderen Chloriden der Fall ist, welche leicht Hydrate bilden.Thorough experiments, however, have shown that such concerns against the use of anhydrous magnesium chloride are unjustified if at the same time the alkali chromates known per se as rust inhibitors can be used. Surprisingly, the effect of the latter is not limited to soluble ones Carbonates such as B. Potash according to patent 480 484, but even in the high Concentration of the solution accumulating chlorides strong enough even when added of only about z ° / "alkali chromate to prevent rusting. Magnesium chlorine crystallized from the melt has a number of properties, which prove to be far superior to sodium chlorine as a de-icing agent. That crystallized Salt is brought into the form of fine flakes by crushing it - expediently up to about 2 mm of greatest length. The leafy structure favors both the throwing power of the powder as well as, in particular, the contact with those causing the dissolution Pieces of snow or ice. The consequent high speed of the thawing effect is also promoted by the particularly low melting point of the cryohydrate of magnesium chloride and the heat of hydration, which has the high value of 33 Cal / Mol. having. As a result, the Use of hindering salt crusts, as is the case with other chlorides, which easily form hydrates.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE525316T | 1930-03-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE525316C true DE525316C (en) | 1931-05-22 |
Family
ID=6552564
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1930525316D Expired DE525316C (en) | 1930-03-04 | 1930-03-04 | Means for thawing points |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE525316C (en) |
-
1930
- 1930-03-04 DE DE1930525316D patent/DE525316C/en not_active Expired
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