BE679773A - - Google Patents

Description

  

   <Desc / Clms Page number 1>
 



  "Protective and lubricating compositions and their use".



   The present invention relates to lubricating and protective compositions intended for use in the ferrous metal industry and in the non-ferrous metal industry, the invention also relating to the use of these compositions.



   Rolling lubricants commonly used in metal rolling operations, for example rolling

 <Desc / Clms Page number 2>

 Cold swelling of steel, copper, brass and aluminum, are oil-in-water emulsions and have a number of disadvantages. During the operation; the lubricant is continuously circulated from a reservoir arranged below the frame of the rolling mill to spray devices or nozzles from which this lubricant is sprayed in the intervals between the rolls of the rolling mill, the lubricant dripping off then from the rolling mill frame into the tank.

   The lubricant dripping into the reservoir carries with it detritus and metallic encrustation formed or removed from the rolled material during the rolling operation and it is difficult to separate this suspended material due to the inherent difficulty of filtering in such a way. An effective emulsion, a difficulty which is enhanced by the fact that the separation of the oil and water phases of the emulsion commonly takes place during the actual rolling operation and in the tank. As a result of this phase separation, the lubricating properties of the lubricant are affected and the liquid in the reservoir must be continuously skimmed to remove the separated oil phase.



   Another type of lubricant commonly used in the steel industry and which has serious drawbacks is that which is applied to steel sheets and strips before cold rolling. In the production of sheet and steel strip by hot rolling followed by cold rolling, it is common practice to subject the steel, at the end of hot rolling, to hot rolling. acid, followed by rinsing and drying, and the steel is then coated with a protective lubricant before being cold rolled.

   This lubricant fulfills two functions, the first being to provide lubrication during the actual cold rolling operation (this lubrication in addition to that provided by the rolling mill lubricant referred to above), the second

 <Desc / Clms Page number 3>

 function being to protect the steel against corrosion and scoring during the period between the treatment of acid pickling and cold rolling, bearing in mind that it is quite usual to store the steel in a roll for days or weeks before it's cold rolled.

   Compositions of fatty and / or mineral oils are commonly used as protective lubricants for this purpose, but their use is subject to a number of disadvantages; thus, because these compositions are liquids and are applied as liquids, there is considerable waste of these oils by seepage and dripping before the steel is cold rolled, and they may form soiling in the rolling mill lubricant applied to the frame thereof.,
The Applicant has now designed a lubricating and protective composition which forms an excellent coating for steel strips before the cold rolling thereof and which can be advantageously used for other similar applications, this composition,

   as a dilute aqueous solution, forming an excellent rolling mill lubricant for use in metal rolling operations.



   In accordance with one aspect of the present invention, therefore, there is provided a lubricating and protective composition which consists essentially of a mixture of 60 to 90% by weight of a salt formed between an amine which is not volatile at temperatures. ambient peratures and a synthetic or natural fatty acid, containing at least 12 carbon atoms, a fatty acid distillation residue or a synthetic polymerized fatty acid, and from 40 to 5% by weight of a sorbitan ester of a fatty acid containing at least 12 carbon atoms, a distillation residue of a fatty acid or a synthetic polymerized fatty acid, or a polyoxyalkylene condensate of such a sorbitan ester.

 <Desc / Clms Page number 4>

 



     According to another aspect of the present invention, there is provided a lubricating and protective composition which consists essentially of a mixture of 40 to 95% by weight of a salt formed between an amine which is not volatile at ambient temperatures and a fatty acid. synthetic or natural containing at least 12 carbon atoms, a fatty acid distillation residue or a synthetic polymerized fatty acid, from 0.1 to 20% by weight of a polyoxyalkylene oxide condensate of a fatty acid or of a resin acid, of a sorbitan ester of a fatty acid containing at least 12 carbon atoms, of a distillation residue of fatty acid or of a synthetic polymerized fatty acid, or of a con - polyoxyalkylene density of such a sorbitan ester, from 5 to 50% by weight of an alkyl ester of synthetic fatty acid,

   this fatty acid containing at least 12 carbon atoms and the alkyl group containing up to 4 carbon atoms, and from 0 to 5% by weight of a water-soluble bactericide,
The present invention also encompasses an aqueous lubricating and protective composition suitable for use as a rolling mill lubricant which consists of a dilute solution of a composition as defined in one or more. other of the preceding paragraphs, in water, the solution suitably containing from 0.5 to 10%, advantageously of
1-4%, by weight lubricating solids.



   Unlike oil-in-water emulsions, which are commonly used as rolling mill lubricants, the aqueous compositions according to the present invention are clear or translucent solutions, which are stable against any separation of one or more of their constituents. all temperatures from the freezing point to the boiling point of the solution (when hard water is used to form the solution, the latter may be cloudy).

   The solutions are, therefore, stable against separation of any component under all temperature conditions.

 <Desc / Clms Page number 5>

 -ratures which meet in a cold rolling operation
 EMI5.1
 -and -ei "s- -are g: alement- es against a separation of the constituents under all the pressures used in the cold rolling operations.



   As the solutions remain stable, they can be filtered using filtration devices capable of separating the finest particles in suspension and can be centrifuged using the highest speeds in order to separate the metallic particles and in - crustation in suspension (from the rolling operation), without any loss of the active ingredients from the solution. Suspended droplets of any foreign oil from leaking mechanical systems that may be present in the solution are also separated by filtration or centrifugation.



   When it is necessary to form a dry coating of the lubricating and protective composition according to the invention on a metal support, for example on a steel strip after the phases of hot rolling, acid pickling and By means of hot rinse, an aqueous composition according to the invention is applied to the metal support by spraying, roller coating, curtain coating, dipping or any other suitable method, and the liquid coating is dried, preferably with water. hot air, and preferably also after the support has been scraped to remove excess aqueous composition (the excess preferably being collected and returned to the reservoir provided for this aqueous composition).

   The coating obtained after drying is usually found to be of the nature of a gel or wax, due to the presence of traces of moisture left by the aqueous composition after drying, and coatings of this type have better, lubricating and protective properties than those that are not of the gel or wax type. The speed of application of the

 <Desc / Clms Page number 6>

 aqueous composition is preferably such that it leaves
 EMI6.1
 40 -1-000 - mg, = usually 4t-¯ i00- mg. of the dry composition per square foot of coated area.

   The coated support can then be stored (in particular in the form of rolls in the case of metal strips.), Without risk of corrosion or scratching, until the moment of cold rolling or until the moment when it is made. subject to further further processing.



   When used as a protective coating for metal strips prior to cold rolling, the composition according to the invention provides a number of advantages. In the first place, since it is in the form of a dried film on the steel, there is no wastage of the lubricant before cold rolling: this is how it is currently common to use 1.5 to 3 pounds of a fatty and / or mineral oil composition per tonne of steel, as much of this oil is lost before cold rolling, it is necessary to use only 2 to 4 ounces of the lubricating composition according to the invention per tonne of steel, which represents a considerable saving.

   Second, the constituents of the lubricant composition of the invention are soluble in most common rolling mill lubricants consisting of oil-in-water emulsions and, of course, in the aqueous compositions according to the invention which. , as previously noted, can be used as rolling mill lubricants, and further, in many cases, replace constituents of such rolling mill lubricants which are depleted or degraded during use. Dissolution of the dry lubricating film in the aqueous rolling mill lubricant during cold rolling can, therefore, help to maintain the properties of the rolling mill lubricant.



   The aqueous lubricants according to the present invention can in most cases also be used as rolling mill lubricants in the cold rolling of steel tapes.

 <Desc / Clms Page number 7>

 hot which have been coated with a common fatty and / or mineral oil composition as a protective lubricant; this situation may arise, for example, when a hot ribbon-shaped material coated with a common composition comes from an external source for cold rolling, and other cases may arise, where it is impossible or impractical to coat a hot strip material pickled with the dry composition according to the invention.

   The presence of such common fatty and / or mineral oil compositions on the material subjected to cold rolling does not normally adversely affect the aqueous compositions of the present invention, provided that proper precautions are taken to separate the material. excess oil from the rolling mill lubricating refrigerant system, for example by skimming.



   The amine salt component of the lubricating composition of the present invention preferably contains a small excess of the amine, for example a 5% excess.



   Suitable amines are, for example, the mono-, di- and triethanolmines, mixed isopropanolamine and aminomethylpropanol = methylamine, ethylamine, diethylamine and morpholine are not suitable because they are too volatile at temperatures. ambient. The long-chain fatty acid, present in the amino salt, may, for example, be constituted by pleic acid or stearic acid. Either the acid component of the amino salt may be a residue from the distillation of fatty acids, which residue may contain polymerized fatty acids, for example pitch acids, or it may be a. such polymerized fatty acid alone, in particular dimer or trimer oleic acid. The amino salt can obviously be formed from a mixture of these acidic components.



   The polyoxyalkylene oxide condensate forming a constituent of the lubricating composition of the invention is preferably a polyoxyethylene oxide condensate, and this con-

 <Desc / Clms Page number 8>

 densate is preferably derived from the condensation of 4 to 44 moles of the alkylene oxide with one mole of fatty or resin acid;

   such condensates will generally have a molecular weight of the order of 400 to 600. Examples of suitable condensates are those which are obtained by the condensation of 8 moles of ethylene oxide with one mole of tall fatty acids. -oil crude, by the condensation of 9 moles of ethylene oxide with one mole of stearic acid, and by the condensation of 22 moles of ethylene oxide with one mole of oleic acid, the condensate of The polyoxyalkylene oxide used should not be formed by a condensate having a negative coefficient of solubility in water. Instead of a polyexyalkylene oxide condensate of a fatty or resin acid, one can use, as previously reported,

   a sorbitan ester of a fatty acid containing at least 12 carbon atoms, of a fatty acid distillation residue or of a synthetic polymerized fatty acid, or one can also use a polyoxyalkylene derivative of a Phone
 EMI8.1
 sorbita9 'ester, for example mono-oleate ie -sorbitan or polyoxyethylene sorbitan mono-oleate (20 moles}.



   The synthetic fatty acid alkyl ester, which is preferably present in the lubricating composition according to the invention, is such that it can be fully peptized in the micellar structure of the amino acid. It follows from this property that even though some of the alkyl esters have only limited solubility. in water in themselves, when they are present in the compositions according to the invention, they are solubilized in an efficient manner and one obtains + clear solutions, -These-alkyl esters of synthetic fatty acids act as anti-foaming agents. It is preferred to employ butyl esters of fatty acids, especially butyl stearate.



   When the lubricating composition contains a water soluble bactericide, this denial should consist of a compound which does not affect the water solubility of the others.

 <Desc / Clms Page number 9>

 very constituents of the composition. Suitable water soluble bactericides are, for example, ortho-phenyl-phenol
 EMI9.1
 amyl cresol, catechol and 2-hydroxymethyl-2-nitropropanediol, the former being preferred.



   To better understand the invention further, a number of examples are given below in which the proportions are given in volumes, these examples being purely; illustrative, without constituting any limitation of the invention.



  EXAMPLE 1
A mixture having the following composition is formed by mixing the compositions together at 140 F: triethanolamine 25% oleic acid 45% Crude tall oil condensate / ethylene oxide (8/1 molar) 7.5% butyl stearate 22 , 5%
A steel strip which has been hot rolled, acid etched and then hot rinsed, is sprayed using a 4% aqueous solution of this mixture, the excess solution being. scraped from the strip (this excess being returned to the supply tank for this spray), and the strip is then dried by a blast of hot air. The strip is then wound up. When unwound after six weeks, the strip was found to be free from corrosion and scratches.



    EXAMPLE 2
A mixture is formed having the following composition, by mixing the components at 140 F
 EMI9.2
 
<tb> triethanolamine <SEP> 25%
<tb>
<tb>
<tb>
<tb> oleic acid <SEP> <SEP> 22.5%
<tb>
<tb>
<tb> acids <SEP> of <SEP> pitch <SEP> 22.5%
<tb>
<tb>
<tb> mono-oleate <SEP> of <SEP> sorbitan <SEP> 7.5%
<tb>
<tb> Butyl <SEP> <SEP> <SEP> 22.5% stearate
<tb>
 

 <Desc / Clms Page number 10>

 EXAMPLE 3
A mixture is formed having the following composition, by mixing the components at 140 F:

   98% of the mixture of example 2 2% ortho-phenyl-phenol
4% aqueous solutions of the mixtures of Examples 2 and 3 gave the same results as described in Example 1, when used to form protective coatings on hot pickled tape material, prior to hot rolling. cold.



  EXAMPLE 4
A mixture having the following composition is formed by mixing the components at 140 F: triethanolamine 32% oletic acid 58% sorbitan mono-oleate 10%
A 4% aqueous solution of this mixture was used to form a coating on a hot strip material pickled as described in Example 1. The same results were obtained.



   Although the use of the compositions of the present invention and their aqueous solutions has been described in particular as protective coatings for hot-rolled steel strips, before cold rolling, and as a lubricant. rolling mill in the cold rolling of steel, the compositions can be used in all similar type metalworking and metal protection processes. The various uses of the compositions can be summarized as follows: (i) as a dried film on metal surfaces generally for use as a protective lubricant in metalworking processes and as a scoring preventer. and corrosion during handling, storage and transport.

   For this use, the compositions have

 <Desc / Clms Page number 11>

 the advantages of ease of application and removal with hot water: (ii) as a metalworking coolant / lubricant, in the form of a dilute aqueous solution; (iii) as a cold-rolling coolant / lubricant for ferrous or non-ferrous metals, in the form of a dilute aqueous solution; (Iv) as a compound for drawing yarns or as lubricant for forming rolls, either in the form of a deposited dry film, or in the form of a dilute aqueous solution, or alternatively in both these forms ;

   (v) as a lubricating / protective composition in tempered rolling operations where some lubrication and cleanliness is required, either as a dry film or as a dilute aqueous solution (vi ) as a dry film to prevent scratching during packing and transporting of metal strips and sheets, having a high surface finish, instead of using paper or other spacers.



   CLAIMS
1. A lubricating and protective composition, which consists essentially of a mixture of 60 to 90% by weight of a salt formed between an amine which is not volatile at ambient temperatures and a synthetic or natural fatty acid, -. containing at least 12 carbon atoms, a fatty acid distillation residue or a synthetic polymerized fatty acid, and from 40 to 5% by weight of a sorbitan ester of a fatty acid containing at least 12 carbon atoms, d a fatty acid or synthetic polymerized fatty acid distillation residue, or a polyoxyalkylene condensate of such a sorbitan ester.

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

 

Claims (1)

2. A lubricating and protective composition, which consists essentially of a mixture of 40 to 95% by weight of a salt formed between an amine which is not volatile at temperatures. <Desc / Clms Page number 12> ambient and a synthetic or natural fatty acid, containing at least 12 carbon atoms, a fatty acid distillation residue or a synthetic polymerized fatty acid, from 0.1 to 20% by weight of a polyoxyalkylene oxide condensate of a fatty acid or of a resin acid, of a sorbitan ester of a fatty acid containing at least 12 carbon atoms, of a fatty acid distillation residue or of a synthetic polymerized fatty acid , or a polyoxyalkylene condensate of such a sorbitan ester, from 5 to 50% by weight of an alkyl ester of synthetic fatty acid, this fatty acid containing at least 12 carbon atoms and the alkyl group containing up to 4 carbon atoms, and from 0 to 5% by weight of a water soluble bactericide. 3. A composition according to claim 2, wherein the polyoxyalkylene oxide condensate is derived from the condensation of 4 to 44 moles of the alkylene oxide with one mole of fatty or resin acid. 4. A composition according to claims 2 or 3, wherein the polyoxyalkylene oxide condensate is derived from the condensation of 8 moles of ethylene oxide with one mole of crude tall oil fatty acids. 5. A composition according to claims 2 or 3, wherein the polyoxyalkylene oxide condensate is derived from the condensation of 9 moles of ethylene oxide with one mole of stearic acid. 6. A composition according to claims 2 or 3, wherein the polyoxyalkylene oxide condensate is derived from the condensation of 22 moles of ethylene oxide with 1 mole of oleic acid. 7. A composition according to any one of claims 2 to 6, wherein the bactericide is ortho-phenyl-phenol. 8. A composition according to any one of claims 1 to 7, wherein the amino salt contains a small <Desc / Clms Page number 13> excess amine. 9. A composition according to any one of claims 1 to 8, wherein the amine from which the salt is derived is mono-, di- or triethanolamine. 10. A composition according to any one of claims 1 to 9, wherein the acid component from which the salt is derived is oleic or stearic acid, pitch acids or a synthetic dimer or trimer fatty acid. 11. A composition according to any one of claims 1 to 10. wherein the sorbitan ester is sorbitan monooleate. 12. A composition according to any one of claims 1 to 10, wherein the polyoxyalkylene sorbitan ester is polyethylene glycol sorbitan monopalmitate, 13. An aqueous lubricating and protective composition which consists of a dilute solution of the composition according to any one of claims 1 to 12 in water. 14. A composition according to claim 13, wherein the solution contains from 0.5 to 10% by weight of solids. 15. A composition according to claim 13, wherein the solution contains 1 to 4% by weight solids, 16. A steel support coated with a film of the composition according to any one of claims 1 to 12. 17. A steel support according to claim 16 which is coated with 40 to 1000 mg of this composition per square foot of area. 18. A method of coating a steel support with a lubricating and protective composition, which consists in applying an aqueous solution according to one or the other of the tempering dications 13 or 15, to the support, to separate the excess of aqueous composition from the surface of the support, and to dry <Desc / Clms Page number 14> then the surface to leave a lubricating and protective film. 19. A lubricating and protective composition, as described above, in particular in the examples given in Brussels, on 20 ouwit 1966 P. Pon de, the company known as HENRY W. PEABODY (INDUSTRIAL) LIMITED P.Pon J. GEVERS fi C