CH608828A5

CH608828A5 - Process for the preparation of a water-soluble lubricant

Info

Publication number: CH608828A5
Application number: CH771743A
Authority: CH
Inventors: Eugen Nussbaum
Original assignee: Eugen Nussbaum
Priority date: 1977-02-09
Filing date: 1977-02-09
Publication date: 1979-01-31

Abstract

A lubricant is prepared which is intended more especially to be employed during the spinning of aluminium aerosol cans, a manufacturing technique which makes use of very high mechanical pressures. This process consists in saponifying a fatty acid with an alkali metal hydroxide and in adding an equivalent quantity by weight of ethyl alcohol to this mixture. The lubricant obtained by making use of this process is soluble in water.

Description

  

  
 

**ATTENTION** debut du champ DESC peut contenir fin de CLMS **.

 



   REVENDICATIONS
 1. Procédé de préparation d'un lubrifiant soluble dans l'eau, caractérisé par le fait qu'on mélange un acide gras et un hydroxyde alcalin, qu'on saponifie ce mélange, puis dissout le savon obtenu dans une quantité approximativement égale à son poids d'alcool éthylique.



   2. Lubrifiant obtenu par la mise en   oeuvre    du procédé selon la revendication 1.



   3. Procédé selon la revendication 1, caractérisé par le fait que   l'on    utilise de l'acide stéarique, de la potasse caustique et de l'alcool éthylique dans les proportions suivantes:
 500 g d'alcool éthylique pur
 400 g d'acide stéarique de   lre    qualité
 90 g de potasse caustique.



   4. Lubrifiant obtenu par la mise en oeuvre du procédé selon les revendications 1 et 3.



   La présente invention a pour objet un procédé de préparation d'un lubrifiant particulièrement approprié pour la lubrification de pièces métalliques obtenues par des procédés de formage, au cours desquels elles sont soumises à des pressions mécaniques très élevées, par exemple lors d'opération de filage, emboutissage, matriçage, étirage, laminage, etc.



   Ce lubrifiant est plus particulièrement destiné à être employé lors du filage de corps métalliques creux ou pleins, notamment de boîtes d'aérosols en aluminium, procédé de formage au cours duquel il entre en jeu des pressions mécaniques très élevées.



   L'invention a également pour objet le lubrifiant soluble dans l'eau obtenu par ce procédé.



   Les meilleurs lubrifiants utilisés jusqu'à ce jour pour lubrifier les surfaces de pièces lors de leur formage par filage sont les savons métalliques tels que stéarate, palmitate et arachinate de zinc. Malheureusement, ces lubrifiants présentent un défaut important: le dégraissage des pièces filées est très difficile à obtenir.



   Pour dégraisser des pièces lubrifiées au moyen de ces savons, on emploie soit:
 1) des solvants chlorés dont l'action est, dans la plupart des cas, insuffisante: les bains deviennent acides et la poussière d'aluminium, étant un bon catalyseur, a tendance à libérer le chlore et à provoquer la formation d'acide chlorhydrique qui détériore les installations de lavage; de plus, ce dégraissage est coûteux, toxique et polluant,
 2. des lessives caustiques à fort dosage (3 à 5%) impliquant un pH de 11 à 14; dans ces conditions, les bains doivent être portés à une température de l'ordre de   80    et, malgré cela, il est encore indispensable, pour obtenir un résultat souvent encore médiocre, de prévoir des durées de dégraissage relativement longues, de l'ordre de 40 à 90 s;

   de plus, ces lessives doivent être neutralisées après usage, car elles sortent de l'installation avec un pH de 11 à
 13. Cette neutralisation est particulièrement coûteuse, par suite de la présence d'hydrate d'aluminium en suspension.



   Le lubrifiant obtenu par le procédé selon l'invention présente l'avantage des savons métalliques, c'est-à-dire qu'il possède un excellent pouvoir de lubrification, sans en présenter le défaut, puisqu'il est soluble dans l'eau. En fait ce lubrifiant n'exige pour
 le dégraissage qu'une lessive alcaline de très faible concentration
 et de pH relativement bas.



   On prépare le lubrifiant selon la présente invention en mélan
 geant un acide gras et un hydroxyde alcalin, en saponifiant ce
 mélange, puis en le dissolvant dans une quantité équivalente en
 poids d'alcool éthylique. Pour obtenir un lubrifiant particulière
 ment approprié au filage des boîtes aérosols, on utilisera:
 500 g d'alcool éthylique pur
 400 g d'acide stéarique de   îre    qualité
 90 g de potasse caustique 



  
 

** ATTENTION ** start of DESC field can contain end of CLMS **.

 



   CLAIMS
 1. Process for preparing a lubricant soluble in water, characterized by the fact that a fatty acid and an alkali hydroxide are mixed, this mixture is saponified, then the soap obtained is dissolved in an amount approximately equal to its ethyl alcohol weight.



   2. Lubricant obtained by carrying out the method according to claim 1.



   3. Method according to claim 1, characterized in that one uses stearic acid, caustic potash and ethyl alcohol in the following proportions:
 500 g of pure ethyl alcohol
 400 g of 1st quality stearic acid
 90 g of caustic potash.



   4. Lubricant obtained by carrying out the process according to claims 1 and 3.



   The present invention relates to a process for preparing a lubricant which is particularly suitable for lubricating metal parts obtained by forming processes, during which they are subjected to very high mechanical pressures, for example during a spinning operation. , stamping, stamping, drawing, rolling, etc.



   This lubricant is more particularly intended for use during the extrusion of hollow or solid metal bodies, in particular aluminum aerosol cans, a forming process during which very high mechanical pressures come into play.



   A subject of the invention is also the water-soluble lubricant obtained by this process.



   The best lubricants used to date to lubricate the surfaces of parts during their extrusion forming are metallic soaps such as zinc stearate, palmitate and arachinate. Unfortunately, these lubricants have a major defect: the degreasing of extruded parts is very difficult to obtain.



   To degrease parts lubricated with these soaps, either:
 1) chlorinated solvents whose action is, in most cases, insufficient: the baths become acidic and aluminum dust, being a good catalyst, tends to release chlorine and cause the formation of hydrochloric acid which deteriorates washing facilities; in addition, this degreasing is costly, toxic and polluting,
 2. high dosage caustic detergents (3 to 5%) involving a pH of 11 to 14; under these conditions, the baths must be brought to a temperature of the order of 80 and, despite this, it is still essential, to obtain a result which is often still mediocre, to provide relatively long degreasing times, of the order of 40 to 90 s;

   in addition, these detergents must be neutralized after use, as they leave the installation with a pH of 11 to
 13. This neutralization is particularly expensive, owing to the presence of aluminum hydrate in suspension.



   The lubricant obtained by the process according to the invention has the advantage of metallic soaps, that is to say that it has excellent lubricating power, without exhibiting the defect, since it is soluble in water. . In fact this lubricant does not require
 degreasing than an alkaline detergent of very low concentration
 and relatively low pH.



   The lubricant according to the present invention is prepared in melan
 geant a fatty acid and an alkali hydroxide, saponifying this
 mixture, then dissolving it in an amount equivalent to
 ethyl alcohol weight. To obtain a specific lubricant
 suitable for the spinning of aerosol cans, we will use:
 500 g of pure ethyl alcohol
 400 g of high quality stearic acid
 90 g of caustic potash

Claims

CLAIMS 1. Process for preparing a lubricant soluble in water, characterized by the fact that a fatty acid and an alkali hydroxide are mixed, this mixture is saponified, then the soap obtained is dissolved in an amount approximately equal to its ethyl alcohol weight.

2. Lubricant obtained by carrying out the method according to claim 1.

3. Method according to claim 1, characterized in that one uses stearic acid, caustic potash and ethyl alcohol in the following proportions: 500 g of pure ethyl alcohol 400 g of 1st quality stearic acid 90 g of caustic potash.

4. Lubricant obtained by carrying out the process according to claims 1 and 3.

The present invention relates to a process for preparing a lubricant which is particularly suitable for lubricating metal parts obtained by forming processes, during which they are subjected to very high mechanical pressures, for example during a spinning operation. , stamping, stamping, drawing, rolling, etc.

This lubricant is more particularly intended for use during the extrusion of hollow or solid metal bodies, in particular aluminum aerosol cans, a forming process during which very high mechanical pressures come into play.

A subject of the invention is also the water-soluble lubricant obtained by this process.

The best lubricants used to date to lubricate the surfaces of parts during their extrusion forming are metallic soaps such as zinc stearate, palmitate and arachinate. Unfortunately, these lubricants have a major defect: the degreasing of extruded parts is very difficult to obtain.

To degrease parts lubricated with these soaps, either: 1) chlorinated solvents whose action is, in most cases, insufficient: the baths become acidic and aluminum dust, being a good catalyst, tends to release chlorine and cause the formation of hydrochloric acid which deteriorates washing facilities; in addition, this degreasing is costly, toxic and polluting, 2. high dosage caustic detergents (3 to 5%) involving a pH of 11 to 14; under these conditions, the baths must be brought to a temperature of the order of 80 and, despite this, it is still essential, to obtain a result which is often still mediocre, to provide relatively long degreasing times, of the order of 40 to 90 s;

in addition, these detergents must be neutralized after use, as they leave the installation with a pH of 11 to 13. This neutralization is particularly expensive, owing to the presence of aluminum hydrate in suspension.

The lubricant obtained by the process according to the invention has the advantage of metallic soaps, that is to say that it has excellent lubricating power, without exhibiting the defect, since it is soluble in water. . In fact this lubricant does not require degreasing than an alkaline detergent of very low concentration and relatively low pH.

The lubricant according to the present invention is prepared in melan geant a fatty acid and an alkali hydroxide, saponifying this mixture, then dissolving it in an amount equivalent to ethyl alcohol weight. To obtain a specific lubricant suitable for the spinning of aerosol cans, we will use: 500 g of pure ethyl alcohol 400 g of high quality stearic acid 90 g of caustic potash ** CAUTION ** end of field CLMS may contain start of DESC **.