WO1981003497A1 - Coating composition for drawing and ironing steel containers - Google Patents

Coating composition for drawing and ironing steel containers Download PDF

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Publication number
WO1981003497A1
WO1981003497A1 PCT/US1981/000724 US8100724W WO8103497A1 WO 1981003497 A1 WO1981003497 A1 WO 1981003497A1 US 8100724 W US8100724 W US 8100724W WO 8103497 A1 WO8103497 A1 WO 8103497A1
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WIPO (PCT)
Prior art keywords
weight
styrene
molecular weight
mixtures
composition
Prior art date
Application number
PCT/US1981/000724
Other languages
French (fr)
Inventor
P Hernandez
Original Assignee
Johnson & Son Inc S C
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Johnson & Son Inc S C filed Critical Johnson & Son Inc S C
Priority to AT81901780T priority Critical patent/ATE15059T1/en
Priority to DE8181901780T priority patent/DE3171906D1/en
Publication of WO1981003497A1 publication Critical patent/WO1981003497A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D191/00—Coating compositions based on oils, fats or waxes; Coating compositions based on derivatives thereof
    • C09D191/06—Waxes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
    • C09D125/02—Homopolymers or copolymers of hydrocarbons
    • C09D125/04—Homopolymers or copolymers of styrene
    • C09D125/08—Copolymers of styrene
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
    • C09D125/02—Homopolymers or copolymers of hydrocarbons
    • C09D125/04—Homopolymers or copolymers of styrene
    • C09D125/08—Copolymers of styrene
    • C09D125/14—Copolymers of styrene with unsaturated esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/062—Copolymers with monomers not covered by C08L33/06
    • C08L33/064—Copolymers with monomers not covered by C08L33/06 containing anhydride, COOH or COOM groups, with M being metal or onium-cation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
    • C08L91/06—Waxes

Definitions

  • This invention relates to a coating composition for use in a steel drawing and ironing process. More particularly, this invention relates to an alkali soluble removable coating composition which can be used to suc ⁇ cessfully deep draw beverage containers from tin-free steel.
  • Beverage containers such as soda and beer cans have been formed by drawing and ironing steel or aluminum to form the beverage container.
  • this drawing and ironing process places great stress on the metal to be drawn and ironed which has led to the requirement that a lubricant composition be coated on the metal surface prior to the can forming operation.
  • this lubri ⁇ cant composition has been a tin coating which was applied to the sheet steel at the mill.
  • This tin coating is a sacrificial coating which allows the steel to be success ⁇ fully drawn. There is no continuous tin coating after the drawing and ironing operation is completed.
  • the present invention is intended to provide improved, sacrificial aqueous coating composition for u in drawing and ironing steel containers which replaces the tin coating heretofore used.
  • This improved coating composition includes fr about 10 to 35% by weight molybdenum disulfide; from ab 4 to 7% by weight of a low molecular weight resin havin monomer content of from about 25 to 35% acrylic acid, an from about 65 to 75% of a styrene monomer selected from the group consisting of styrene, alpha-methyl styrene, and mixtures thereof; from about 10 to 25% by weight of aqueous wax emulsion containing from about 15 to 25% non volatiles; from about 3 to 7% by weight of a high molecu lar weight acrylic polymer comprising from about 25 to 6 of a styrene monomer selected from the group consisting styrene, alpha-methyl styrene and mixtures thereof, from about 30 to 50% by weight of an ester selected from meth methacrylate, methyl acrylate, ethyl acrylate, ethyl methacrylate butyl acrylate and mixtures thereof, and
  • this coating compositi of the invention is the fact that the coating compositi is easily removable after drawing and ironing a steel container.
  • the present invention is directed to an improved aqueous sacrificial coating composition for use in drawing and ironing steel containers and includes from about 10 to 35% by weight of molybdenum disulfide
  • Molybdenum disulf ⁇ ide is a well known lubricating compound.
  • the molybdenum disulfide is the primary lubricant in the composition of the present invention giving both dry and extreme pressure lubricating properties to the composition.
  • the molybdenum disulfide must be dispersed throughout the com ⁇ position, so that a thin, uniform coating of this material can be applied to the steel"plate. If a uniform coating of the molybdenum disulfide is not deposited on the steel prior to drawing, the drawn containers may not be uniform ⁇ ly produced.
  • the composition of the present invention also includes from about 4 to 7 % by weight of a low molecular weight resin, having a monomer content of from about 25 to 35% acrylic acid, and from about 65 to 75% of a styrene monomer selected from the group consisting of styrene, alpha-methyl styrene, or mixtures thereof.
  • the resin functions to suspend the solid lubricating agent, the molybdenum disulfide, in the formulation.
  • the resin also aids in the formation of an impervious polymer film on the coated steel and adds some alkaline sensitivity to the film to provide removability.
  • suitable low molecular weight resins are those having a monomer content of 32% acrylic acid, 31% styrene, and 37% alpha-methyl styrene; 67% styrene and 33% acrylic acid, 72% styrene, 28% acrylic acid. It - 4 - is preferred to utilize resins having a number average molecular weight of from 2,500 to 5,000. It is preferred to utilize from about 5 to 7%. by weight of a low molecular weight resin.
  • the composition of the present invention also in cludes from about 10 to 25% by weight of an aqueoux wax emulsion.
  • Aqueous wax emulsions typically have a solids content, or a non-volatiles content of from about 15 to 25% by weight.
  • These emulsions are typically prepared, utilizing either anionic, nonionic, or combinations of anionic and nonionic surfactants, along with both synthe ⁇ tic and natural waxes.
  • the wax emulsion acts as a bound ⁇ ary lubricant giving secondary lubricating properties to the composition.
  • the wax emulsion also has a plasticizing effect on the polymer film keeping the film from being too brittle.
  • Typical wax emul ⁇ sions include wax emulsions of polyethylene waxes, Hoechst waxes, Fischer-Tropsch waxes, and other synthetic waxes, as well as emulsions of natural waxes such as Caranuba, Montan, Candelilla, and Paraffin waxes. It is preferred to utilize from about 10 to 15% by weight of a wax emul ⁇ sion having a solids content of from about 15 to 20% non- volatiles.
  • composition of the present invention also in cludes from about 3 to 7% by weight of a high molecular weight acrylic polymer.
  • High m leculate acrylic polymers have a molecular weight MW, typically in excess of 200,000. These materials are formed having a monomer con ⁇ tent of from about 25 to 50% of a styrene-type monomer selected from the group consisting of styrene, alpha- methyl styrene and mixtures thereof, from about 30 to 50%
  • an ester selected from methyl methacrylate, methyl acrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate and mixtures thereof, and from about 10 to 25% by weight of an acid selected from the group consisting of acrylic acid or methacr lic acid.
  • Examples of typical polymers include 20% alpha-methyl styrene, 30% styrene, 40% ethyl acrylate, 10% methacrylic acid, 12% alpha-methyl styrene, 35% styrene, 7% methyl methacrylate, 35% butyl acrylate, 13% methacrylic acid; 55% styrene, 25% butyl acrylate, 20% methacrylic acid, etc. It is preferred to utilize from about 3 to 5% by weight of high molecular weight resin.
  • the high molecular weight polymer is the primary film former, forming a water insensitive- film when dried in combination with ' the zinc cross-linking agent. This material; however, is easily removed with alkaline cleaner. In amounts below 10%, poor adhesion results, while above 25%, the resulting films are too water insen ⁇ sitive.
  • the composition also includes from about 1 to 5% by weight of the solvent.
  • solvents are used primar ⁇ ily as coalescing agents for the pigment and polymer, and help to speed drying of the film.
  • Suitable solvents in- ' elude diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether.
  • the films require too long to properly dry for a high speed industrial application while at amounts in excess of 5% the resulting films are too soft. It is preferred to utilize from about 1 to 3% by weight of a solvent in a composition.
  • compositions of the present invention also include a small percentage, from about 0.1 to 0.25% of a water soluble zinc and containing salt.
  • This zinc salt can be substantially any water soluble zinc containing material which will release zinc cation to the aqueous system.
  • a complex zinc salt such as zinc ammonium carbonate, as this co plex zinc salt readily complexes with both the acrylic polymers, and the resin in the instant composition to f water insensitive, impervious coating.
  • the composition the present invention should include just sufficient zi salt to provide a zinc content to give the desired dryi and film insolubilization properties. The zinc also effects the dry time of the coating of the present inve ion.
  • zinc also provides the alkaline removability of the instant composition. At a neutral pH the zinc forms temporary cross-links with the acid functionality in th polymer and resin forming a water insensitive coating. highly alkaline pH's these zinc cross-links are broken resolubilizing the resins. In amounts above 0.25% the stability of the liquid composition is reduced.
  • compositions of the prese invention are primarily aqueous based, and include a su stantial percentage of water, i.e. from about 35 to 55% water.
  • a su stantial percentage of water i.e. from about 35 to 55% water.
  • any water can be utilized, includ tap water, deionized water, and the like.
  • ordinary tap water can be utilized.
  • the instant composition can be prepared by ba milling the molybdenum disulfide, along with the low molecular weight resin, and water. This disperses and stabilizes the pigments.
  • This aqueous molybdenum disul fide resin mixture should be ball milled for from betwe 4 to 8 hours. At this time- the ball milled molybdenum disulfide is added to the wax emulsion while continuous mixing. After the molybdenum disulfide mixture is adde then the high molecular weight acrylic polymer is added and the coalescing solvent and soluble zinc salt are added last with agitation.
  • This aqueous composition is
  • compositions of the present invention are utilized by applying a thin coating of the composition on sheet steel immediately prior to the steel being fed to the cupper in a drawing and ironing process.
  • the composi ⁇ tions can be applied either by roll coating or by printing to provide an appropriate film thickness to provide suf ⁇ ficient lubricating properties . It has been found that films which provide a molybdenum disulfide coating within the range -of from about 20 to 40 milligrams of molybdenum disulfide per square foot of steel sheet function best.
  • the compo ⁇ sition of the present invention can also include small, minor amounts of other optional ingredients so long as these materials do not interfere with the present composition.
  • These otter components include corrosion inhibitors, bactericides, preservatives, and the like.
  • composition of the present invention will • now be illustrated by way of the following example, wherein all parts and percentages are by weight, and all temperatures are in degrees Celsius.
  • a wax emulsion was prepared, comprising .4% tri- ethanolamine, .2% of a 37% solution of formaldehyde, .1% of a 10 mole aqueous solution of sodium borate, .7% coconut diethanolamide, 1.1% stearic acid, 1.0% of a syn ⁇ thetic sperm oil, 81.06% water, 12.04% of a synthetic wax (Smithwax 117) .4% boric acid, and 3% pentherythritol monostearate. This material was combined to form an aqueous wax emulsion.
  • molybdenum disulfide suspension grade
  • 14.8% of a 35% non-volatile aqueous resin solution of 29% styrene, 31% acrylic acid, and 37% alpha-methyl styrene, and 29.6% water.
  • the molybdenum disulfide resin and water are ball milled for from 4 to 8 hours, until the molybdenum is dispersed and stabilized. This mixture is then added to 14.8% aqueous wax emulsion by slowly adding the molybdenum suspension with mixing.
  • This material is mixed to form a stable molybdenum disul fide dispersion.
  • composition was then printed on sheet stee which is subsequently drawn and ironed into beverage containers.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Paints Or Removers (AREA)
  • Lubricants (AREA)

Abstract

An improved, aqueous coating composition for use in a sacrificial lubricating coating, for drawing and ironing sheet steel to form beverage containers comprising molybdenum disulfide, an aqueous low molecular weight styrene containing resin, a wax emulsion, a high molecular weight acrylic polymer, a zinc cross-linking agent, a coalescent solvent, and water.

Description

COATING COMPOSITION FOR DRAWING AND IRONING STEEL CONTAINERS
This invention relates to a coating composition for use in a steel drawing and ironing process. More particularly, this invention relates to an alkali soluble removable coating composition which can be used to suc¬ cessfully deep draw beverage containers from tin-free steel.
Beverage containers such as soda and beer cans have been formed by drawing and ironing steel or aluminum to form the beverage container. However, this drawing and ironing process places great stress on the metal to be drawn and ironed which has led to the requirement that a lubricant composition be coated on the metal surface prior to the can forming operation. For steel cans, this lubri¬ cant composition has been a tin coating which was applied to the sheet steel at the mill. This tin coating is a sacrificial coating which allows the steel to be success¬ fully drawn. There is no continuous tin coating after the drawing and ironing operation is completed. Due to the prices of tin, the use of tin as a sacrificial coating for drawing and ironing steel beverage containers has become impractical, and a search has been conducted for a remov¬ able coating which can be easily and simply applied to black plate steel to allow the same to be drawn and ironed into beverage containers. The present invention is intended to provide improved, sacrificial aqueous coating composition for u in drawing and ironing steel containers which replaces the tin coating heretofore used.
This improved coating composition includes fr about 10 to 35% by weight molybdenum disulfide; from ab 4 to 7% by weight of a low molecular weight resin havin monomer content of from about 25 to 35% acrylic acid, an from about 65 to 75% of a styrene monomer selected from the group consisting of styrene, alpha-methyl styrene, and mixtures thereof; from about 10 to 25% by weight of aqueous wax emulsion containing from about 15 to 25% non volatiles; from about 3 to 7% by weight of a high molecu lar weight acrylic polymer comprising from about 25 to 6 of a styrene monomer selected from the group consisting styrene, alpha-methyl styrene and mixtures thereof, from about 30 to 50% by weight of an ester selected from meth methacrylate, methyl acrylate, ethyl acrylate, ethyl methacrylate butyl acrylate and mixtures thereof, and from about 10 to 25% of an acid selected from the group consisting of acrylic acid and methacrylic acid; from about 1 to 5% by weight of a solvent selected from the group consisting of diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether and mixtures thereof; from about 0.1 to 0.25% by weight of a water soluble zinc containing salt; and from about 35 to 55% by weight water.
Among the advantages of this coating compositi of the invention, is the fact that the coating compositi is easily removable after drawing and ironing a steel container.
I VvlP Additional advantages of the composition of the composition of the present invention will become more apparent from the following detailed description .of one embodiment of the invention.
The present invention is directed to an improved aqueous sacrificial coating composition for use in drawing and ironing steel containers and includes from about 10 to 35% by weight of molybdenum disulfide Molybdenum disulf¬ ide is a well known lubricating compound. The molybdenum disulfide is the primary lubricant in the composition of the present invention giving both dry and extreme pressure lubricating properties to the composition. However, the molybdenum disulfide must be dispersed throughout the com¬ position, so that a thin, uniform coating of this material can be applied to the steel"plate. If a uniform coating of the molybdenum disulfide is not deposited on the steel prior to drawing, the drawn containers may not be uniform¬ ly produced. . It is preferred that from about 15 to 30% by weight molybdenum disulfide be utilized. The composition of the present invention also includes from about 4 to 7 % by weight of a low molecular weight resin, having a monomer content of from about 25 to 35% acrylic acid, and from about 65 to 75% of a styrene monomer selected from the group consisting of styrene, alpha-methyl styrene, or mixtures thereof. The resin functions to suspend the solid lubricating agent, the molybdenum disulfide, in the formulation. The resin also aids in the formation of an impervious polymer film on the coated steel and adds some alkaline sensitivity to the film to provide removability. In amounts above 25% the resulting film is too water sensitive while amounts below 10% do not properly suspend the molybdenum disul¬ fide. Examples of suitable low molecular weight resins are those having a monomer content of 32% acrylic acid, 31% styrene, and 37% alpha-methyl styrene; 67% styrene and 33% acrylic acid, 72% styrene, 28% acrylic acid. It - 4 - is preferred to utilize resins having a number average molecular weight of from 2,500 to 5,000. It is preferred to utilize from about 5 to 7%. by weight of a low molecular weight resin.
The composition of the present invention also in cludes from about 10 to 25% by weight of an aqueoux wax emulsion. Aqueous wax emulsions typically have a solids content, or a non-volatiles content of from about 15 to 25% by weight. These emulsions are typically prepared, utilizing either anionic, nonionic, or combinations of anionic and nonionic surfactants, along with both synthe¬ tic and natural waxes. The wax emulsion acts as a bound¬ ary lubricant giving secondary lubricating properties to the composition. The wax emulsion also has a plasticizing effect on the polymer film keeping the film from being too brittle. Brittle films would not provide proper adhesion of the lubricant to the steel during the drawing and ironing operation. At wax contents below 10% the result¬ ing, coating becomes too brittle, while above 25% no in- creased lubricating property results. Typical wax emul¬ sions include wax emulsions of polyethylene waxes, Hoechst waxes, Fischer-Tropsch waxes, and other synthetic waxes, as well as emulsions of natural waxes such as Caranuba, Montan, Candelilla, and Paraffin waxes. It is preferred to utilize from about 10 to 15% by weight of a wax emul¬ sion having a solids content of from about 15 to 20% non- volatiles.
The composition of the present invention also in cludes from about 3 to 7% by weight of a high molecular weight acrylic polymer. High m leculate acrylic polymers have a molecular weight MW, typically in excess of 200,000. These materials are formed having a monomer con¬ tent of from about 25 to 50% of a styrene-type monomer selected from the group consisting of styrene, alpha- methyl styrene and mixtures thereof, from about 30 to 50%
OI.. by weight of an ester selected from methyl methacrylate, methyl acrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate and mixtures thereof, and from about 10 to 25% by weight of an acid selected from the group consisting of acrylic acid or methacr lic acid. Examples of typical polymers include 20% alpha-methyl styrene, 30% styrene, 40% ethyl acrylate, 10% methacrylic acid, 12% alpha-methyl styrene, 35% styrene, 7% methyl methacrylate, 35% butyl acrylate, 13% methacrylic acid; 55% styrene, 25% butyl acrylate, 20% methacrylic acid, etc. It is preferred to utilize from about 3 to 5% by weight of high molecular weight resin. - The high molecular weight polymer is the primary film former, forming a water insensitive- film when dried in combination with' the zinc cross-linking agent. This material; however, is easily removed with alkaline cleaner. In amounts below 10%, poor adhesion results, while above 25%, the resulting films are too water insen¬ sitive.
The composition also includes from about 1 to 5% by weight of the solvent. These solvents are used primar¬ ily as coalescing agents for the pigment and polymer, and help to speed drying of the film. Suitable solvents in- ' elude diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether. At amounts below 1% the films require too long to properly dry for a high speed industrial application while at amounts in excess of 5% the resulting films are too soft. It is preferred to utilize from about 1 to 3% by weight of a solvent in a composition.
The compositions of the present invention also include a small percentage, from about 0.1 to 0.25% of a water soluble zinc and containing salt. This zinc salt can be substantially any water soluble zinc containing material which will release zinc cation to the aqueous system. For convenience, it is preferred to use a complex zinc salt, such as zinc ammonium carbonate, as this co plex zinc salt readily complexes with both the acrylic polymers, and the resin in the instant composition to f water insensitive, impervious coating. The composition the present invention should include just sufficient zi salt to provide a zinc content to give the desired dryi and film insolubilization properties. The zinc also effects the dry time of the coating of the present inve ion. If insufficient zinc is present the coating will take too long to dry and will be too water sensitive. zinc also provides the alkaline removability of the instant composition. At a neutral pH the zinc forms temporary cross-links with the acid functionality in th polymer and resin forming a water insensitive coating. highly alkaline pH's these zinc cross-links are broken resolubilizing the resins. In amounts above 0.25% the stability of the liquid composition is reduced.
As noted above, the compositions of the prese invention are primarily aqueous based, and include a su stantial percentage of water, i.e. from about 35 to 55% water. Substantially any water can be utilized, includ tap water, deionized water, and the like. As the compo tions of the present invention are not particularly sen tive to cations, ordinary tap water can be utilized.
The instant composition can be prepared by ba milling the molybdenum disulfide, along with the low molecular weight resin, and water. This disperses and stabilizes the pigments. This aqueous molybdenum disul fide resin mixture should be ball milled for from betwe 4 to 8 hours. At this time- the ball milled molybdenum disulfide is added to the wax emulsion while continuous mixing. After the molybdenum disulfide mixture is adde then the high molecular weight acrylic polymer is added and the coalescing solvent and soluble zinc salt are added last with agitation. This aqueous composition is
\_) S._
O...F
• At VIF remarkably stable on storage, with little, -if no, separa¬ tion of the molybdenum disulfide lubricant.
The compositions of the present invention are utilized by applying a thin coating of the composition on sheet steel immediately prior to the steel being fed to the cupper in a drawing and ironing process. The composi¬ tions can be applied either by roll coating or by printing to provide an appropriate film thickness to provide suf¬ ficient lubricating properties . It has been found that films which provide a molybdenum disulfide coating within the range -of from about 20 to 40 milligrams of molybdenum disulfide per square foot of steel sheet function best.
In addition to the above components, the compo¬ sition of the present invention can also include small, minor amounts of other optional ingredients so long as these materials do not interfere with the present composition. These otter components include corrosion inhibitors, bactericides, preservatives, and the like.
The composition of the present invention will • now be illustrated by way of the following example, wherein all parts and percentages are by weight, and all temperatures are in degrees Celsius.
EXAMPLE
A wax emulsion was prepared, comprising .4% tri- ethanolamine, .2% of a 37% solution of formaldehyde, .1% of a 10 mole aqueous solution of sodium borate, .7% coconut diethanolamide, 1.1% stearic acid, 1.0% of a syn¬ thetic sperm oil, 81.06% water, 12.04% of a synthetic wax (Smithwax 117) .4% boric acid, and 3% pentherythritol monostearate. This material was combined to form an aqueous wax emulsion.
Some 29.6% of molybdenum disulfide, suspension grade, is ball milled with 14.8% of a 35% non-volatile aqueous resin solution of 29% styrene, 31% acrylic acid, and 37% alpha-methyl styrene, and 29.6% water. The molybdenum disulfide resin and water are ball milled for from 4 to 8 hours, until the molybdenum is dispersed and stabilized. This mixture is then added to 14.8% aqueous wax emulsion by slowly adding the molybdenum suspension with mixing. After this-mixture has been formed, 10% of a 35% non-volatiles composition of a high molecular weig resin having 12% alpha-methyl styrene, 35% styrene, 7% methyl methacrylate,- 33% butyl acrylate, and 13% meth¬ acrylic acid is added with mixing. At this time, 2% di¬ ethylene glycol monobutyl ether is added, along with 1% of a 15% aqueous solution of zinc ammonium carbonate.
This material is mixed to form a stable molybdenum disul fide dispersion.
The composition was then printed on sheet stee which is subsequently drawn and ironed into beverage containers.
G.--P

Claims

1. An improved, sacrificial aqueous coating composition for use in drawing and ironing steel contain¬ ers including from about 10 to 35% by weight molybdenum disulfide; from about 4 to 7% by weight of a low molecular weight resin having a monomer content .of from about 25 to 35% acrylic acid, and from about 65 to 75% of a styrene monomer selected from the group consisting of styrene, alpha-methyl styrene, and mixtures thereof; from about 10 to 25% by weight of an aqueous wax emulsion containing from about 15 to 25% non-volatiles; from about 3 to 7% by weight of a high molecular weight acrylic polymer compris¬ ing from about 25 to 60% of a styrene monomer selected from the group consisting of styrene, alpha-methyl styrene and mixtures thereof, from about 30 to 50% by weight of an. ester selected from methyl methacrylate, methyl acrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate and mixtures thereof, and from about 10 to 25% of an acid selected from the group consisting of acrylic acid and metha,crylic acid; from about 1 to 5% by weight of a sol¬ vent selected from the group consisting of diethylene gly¬ col monoethyl ether, diethylene glycol monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether and mixtures thereof; from about 0.1 to 0.25% by weight of a water soluble zinc containing salt; and from 35 to 55% by weight water.
2. The coating composition of Claim 1, wherein the low molecular weight resin has a number average molec¬ ular weight of from 2,500 to 5,000.
3. The composition of Claim 1 or 2, wherein the low molecular weight resin has a monomer content of from 25 to 35% acrylic acid, from 25 to 35% styrene, and 35 to 45% alpha-methyl styrene.
PCT/US1981/000724 1980-06-03 1981-06-01 Coating composition for drawing and ironing steel containers WO1981003497A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT81901780T ATE15059T1 (en) 1980-06-03 1981-06-01 COATING COMPOSITION FOR DRAWING AND IRON STEEL CONTAINERS.
DE8181901780T DE3171906D1 (en) 1980-06-03 1981-06-01 Coating composition for drawing and ironing steel containers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/156,148 US4289671A (en) 1980-06-03 1980-06-03 Coating composition for drawing and ironing steel containers
US156148 1998-09-18

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EP (1) EP0052653B1 (en)
JP (1) JPS57500739A (en)
CA (1) CA1161826A (en)
WO (1) WO1981003497A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
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US4289671A (en) 1981-09-15
EP0052653A4 (en) 1982-10-14
JPS57500739A (en) 1982-04-30
CA1161826A (en) 1984-02-07
EP0052653B1 (en) 1985-08-21
EP0052653A1 (en) 1982-06-02

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