CA1084684A - Water-soluble film-forming rust preventive composition - Google Patents
Water-soluble film-forming rust preventive compositionInfo
- Publication number
- CA1084684A CA1084684A CA254,225A CA254225A CA1084684A CA 1084684 A CA1084684 A CA 1084684A CA 254225 A CA254225 A CA 254225A CA 1084684 A CA1084684 A CA 1084684A
- Authority
- CA
- Canada
- Prior art keywords
- hydrocarbon
- water
- rust
- soluble film
- rust preventive
- 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
- 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
- C09D133/00—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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
-
- 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
- C09D135/00—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 a carboxyl radical, and containing at least another carboxyl radical in the molecule, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Coating compositions based on derivatives of such polymers
-
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Paints Or Removers (AREA)
Abstract
Abstract of the Disclosure:
A water-soluble film-forming rust preventive composition prepared by modifying, through mixing with an alkaline solution, a homopolymer of a hydrocarbon having a double bond or bonds in the molecule and selected from the group consisting of carboxylic acids and anhydrides, and/or a copolymer of the said hydrocarbon and an olefinic hydrocarbon having from 2 to 6 carbon atoms per molecule.
A water-soluble film-forming rust preventive composition prepared by modifying, through mixing with an alkaline solution, a homopolymer of a hydrocarbon having a double bond or bonds in the molecule and selected from the group consisting of carboxylic acids and anhydrides, and/or a copolymer of the said hydrocarbon and an olefinic hydrocarbon having from 2 to 6 carbon atoms per molecule.
Description
This invention relates to improvements in a water-soluble film-forming rust preventive composition for use in temporary protection of metal surfaces, particularly of iron and steel products.
For the temporary rust prevention of such products oil-film type anticorrosive materials are in wide use.
The oil-film types maintain the rust preventive effect forrelatively long periods of time, but are known to have shortcomings. For example, when their temporary coated films are to be removed, they require (a~ degreasing and washing with an alkali cleaner, solvent, etc., (b) an after~treatment -of the waste liquor drained from the washing process, and (c) ;many man-hours and a high equipment cost for those purposes.
As attempts to overcome those shortcomings and provide improvements, a water-soluble film-forming rust preventive material and soft-film type water-soluble antirust composition have already been proposed.
Their coated films continue to have the rust inhibitive effect for long and can be simply removed by washing with water -20 after they have fulfilled their purpose of temporary rust prevention. With these advantages they have been applied to land and marine tanks and other equipments and have successfully rationalized the rust prevention andcontrol of those structures.
Still, the above-mentioned rust preventive material and composition have problems yet to be solved which make them practically useless for some types of tanks and apparatuses.
~;Among the problems in common are (i) lack of moisture ~ .
,' . ~, : .
For the temporary rust prevention of such products oil-film type anticorrosive materials are in wide use.
The oil-film types maintain the rust preventive effect forrelatively long periods of time, but are known to have shortcomings. For example, when their temporary coated films are to be removed, they require (a~ degreasing and washing with an alkali cleaner, solvent, etc., (b) an after~treatment -of the waste liquor drained from the washing process, and (c) ;many man-hours and a high equipment cost for those purposes.
As attempts to overcome those shortcomings and provide improvements, a water-soluble film-forming rust preventive material and soft-film type water-soluble antirust composition have already been proposed.
Their coated films continue to have the rust inhibitive effect for long and can be simply removed by washing with water -20 after they have fulfilled their purpose of temporary rust prevention. With these advantages they have been applied to land and marine tanks and other equipments and have successfully rationalized the rust prevention andcontrol of those structures.
Still, the above-mentioned rust preventive material and composition have problems yet to be solved which make them practically useless for some types of tanks and apparatuses.
~;Among the problems in common are (i) lack of moisture ~ .
,' . ~, : .
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.
resistance and consequent so-Ltening of the coated films in summer or highly humid environmen-ts, (ii) necessity of hea-ting and liquefying prior to coating the materials which are soft solids at ordinary -temperature, and (iii) such high viscosity upon melting that the materials require an airless spraying machine or other special equipment for coating.
The present invention has been perfected with the view to settling those problems and is directed to a water-soluble film-forming rust preventive composition of great practical value which is in the form of an appropriately viscous liquid at ordinary temperature and applicable by a common air spraying machine ~o form a coated film~ which film is highly resistant to m~isture and capable of inhibiting rust for an extended period of time and is readily removed~ after the temporary use as such, by a treatment with water at ordinary temperature.
According to the invention~ the water-soluble film-forming rust preventive composition is prepared by modifying~
through mixing with an alkaline solution~ a homopolymer of hydrocarbon having a double bond or bonds in the molecule and selected from the group consisting of carboxylic acids and anhydrides, and/or a copolymer of the said hydrocarbon and an olefinic hydrocarbon having from 2 to 6 carbon atoms per molecule.
The monomer, which may be regarded as an intermediate product in the present invention, is either a homopolymer of a monomer~ i.e.~ one of the hydrocarbons to be mentionecl later~ or a copolymer of the hydrocarbon and an olefinic hydrocarbon having from 2 to 6 carbon atoms per molecule~
.
desir~bly with a polymerization degree between about 300 and about 3000. If the polymerization degree is very low, the rust preventive composition of the invention will have a correspondingly low film-forming ability, and if the degree is excessively high the composition will become so viscous that it will pose problems in coatability as is the case with the prior art compositions. Suitable hydrocarbons for use as monomers in accordance with the invention are carboxylic acids or anhydrides having double bonds in the molecules.
The numbers of such double bonds and carboxyl groups are not critical7 but one or more each will be satisfactory. Examples of such hydrocarbons include, but not limited to, acrylic acid~ methacrylic acid~ cinnamic acid, maleic acid~
maleic anhydride, crotonic acidg allylacetic acid, allylpropionic -acid, l-carboxy-l-ethyl ethylene, l-carboxy-l-propyl ethylene, ethylacrylic acid, propylacrylic acid~ butylacrylic acid, ethylmaleic acid~ and methylmaleic acid.
The olefinic hydrocarbon to form a copolymer with such a carboxylic acid or anhydride is chosen from the hydrocarbons~
such as ethylen~ propylene~ butylene~ amyIene~ and hexylene~
having rom 2 to 6 carbon atoms in the molecule. An olefinic hydrocarbon with 7 or more carbon atoms will not only impart excessive viscosity to the resulting rust preventive composi-tion but also have other undesirable effects upon the use o the composition.
In synthesizing the homopolymer and copolymer rom the hydrocarbons7 the usual polymerization reaction may be used.
In any case, the homopolymer, copolymer~ or their mixture - thus obtained alone will not be able -to form a water-soluble . . .
6i3~L
rust preventive -film. The polymer or polymeric mixture will be able to do so only when it is modified with a solution of alkali, e.g., in water.
When the polymer is mixed in an aqueous solution or the like of an alkali metal salt, e~g.~ sodium hydroxide, and the mixture is treated by heating at a suitable temperature~
e.g.~ in the neighborhood of 70C~ the product will be a ~` viscous liquid at ordinary -temperature. This mixture will work as a water-soluble film-forming rust preventive composi-tion according to the invention.
Exactly what change the polymer does undergo upon the modifying treatment is to be clarified yet~ but it is presumed that at least a part or whole of the carboxyl groups in the polymer produces a carboxylate.
The alkaline agent required for the modification is not limited to the above-mentioned sodium hydroxide. Other alkali metal salts9 such as lithium hydroxide and sodium carbonate, alkali earbh metal salts~ such as magnesium oxalate3 calcium hydroxide~ and barium carbonate, and ammonia may be used as well. Aside from these inorganic alkaline agents, organic ones, such as ethanolamine and hexylamine~ are useful) too.
The water-soluble film-forming rust preventive composi-tion obtained in accordance with the invention occurs as a viscous liquid at ordinary temperature which~ lmlike the conventional compositions of the character, requires no pre-heating to liquid form before application on metal surfaces as of iron and steel products. It may be coated by ordinary air sprayin~ machines as well as by airless spraying equipment~
to form fine resinous coated films on the metal surfaces.
,; , . . . , .~, , . ,: , ' '`''" '' '' ' ' ' ' ' . ' " ' ' ' "' ' . ', " ', ' . ' 613~
These resinous films are thin but capable of inhibiting corrosion ~or long periods of time. Moreover, they are moisture-proof as compared with the conventional coated films, and have no possibility of softening in summer or under high humidity conditions. On the contrary, they exhibit a drying tendency and are able to isolate and protect the metal surfaces from corrosive atmospheres. After having served the purpose of temporary rust prevention, the coated films can be easily removed from the metal surfaces by simple immersion in or washing with water at ordinary temperature.
For added corrosion resistance, the water-soluble film~
- forming rust preventive composition of the invention may contain a small percentage of a known rust inhibitor or inhi-bitors.
The viscous mixture may thus contain one or more inhibi-tors selected from among sodium nitrite7 sodium phosphate, sodium borate, triethanolamine, dicyclohexylamine nitr~te~ and petroleum sulfonate. Such a rust inhibitor, when mixed in the composition and applied on a metal surface will be secured thereto by molecular adsorption or will be passivated thereon~ thus permitting the coated film to display an e~cellent antirust effect for an extended period of time as ~ ~ compared with the film free of the inhibitor.
; The invention is illustrated by the following examples.Specimens (l), (2), and (3) of three embodiments of the water-soluble film-forming rust preventive composition of the invention were prepared in conformity with the compounding recipe~ ~iven in the left column of Table 1. An exemplary procedure for preparation is as follows. First~ a reaction .
' ' ''',' ' : '," ~ '. ~ ' ' .. . . ..
63~d~
vessel is filled with water, and potassium hydroxide and magnesium hydroxide are charged into the vessel. The mixture is heated to 70C~ and a maleic acid-butylene copolymer is added, and all are thoroughly mixed. The mixture will then become transparent or semitransparent. This is the specimen (1). The specimen (2) may be prepared generally in accordance with the above-described procedure. The specimen (3) was obtained by adding sodium nitrite and trie-thanolamine to the mixture o~' the specimen (~) when the latter became transparent or semitransparent.
Table ~ ..
Speci- Compounding recipe of water- Qity Rust men soluble ~ilm-forming rust coated develop No. preventive composition (g/m2) ment _ Maleic anhydride -butylene copolymer lOOg Potassium hydroxide 22 No (1) ~agnesium hydroxide 25 5 rust Water 9 _ Acrylic polymer lOOg (2) Lithium hydroxide 7 40 Barium carbonate 30 Water 650 _ .
Maleic acid -propylene copolymer lOOg Sodium carbonate 30
: '' ,:, ~ , :
.
resistance and consequent so-Ltening of the coated films in summer or highly humid environmen-ts, (ii) necessity of hea-ting and liquefying prior to coating the materials which are soft solids at ordinary -temperature, and (iii) such high viscosity upon melting that the materials require an airless spraying machine or other special equipment for coating.
The present invention has been perfected with the view to settling those problems and is directed to a water-soluble film-forming rust preventive composition of great practical value which is in the form of an appropriately viscous liquid at ordinary temperature and applicable by a common air spraying machine ~o form a coated film~ which film is highly resistant to m~isture and capable of inhibiting rust for an extended period of time and is readily removed~ after the temporary use as such, by a treatment with water at ordinary temperature.
According to the invention~ the water-soluble film-forming rust preventive composition is prepared by modifying~
through mixing with an alkaline solution~ a homopolymer of hydrocarbon having a double bond or bonds in the molecule and selected from the group consisting of carboxylic acids and anhydrides, and/or a copolymer of the said hydrocarbon and an olefinic hydrocarbon having from 2 to 6 carbon atoms per molecule.
The monomer, which may be regarded as an intermediate product in the present invention, is either a homopolymer of a monomer~ i.e.~ one of the hydrocarbons to be mentionecl later~ or a copolymer of the hydrocarbon and an olefinic hydrocarbon having from 2 to 6 carbon atoms per molecule~
.
desir~bly with a polymerization degree between about 300 and about 3000. If the polymerization degree is very low, the rust preventive composition of the invention will have a correspondingly low film-forming ability, and if the degree is excessively high the composition will become so viscous that it will pose problems in coatability as is the case with the prior art compositions. Suitable hydrocarbons for use as monomers in accordance with the invention are carboxylic acids or anhydrides having double bonds in the molecules.
The numbers of such double bonds and carboxyl groups are not critical7 but one or more each will be satisfactory. Examples of such hydrocarbons include, but not limited to, acrylic acid~ methacrylic acid~ cinnamic acid, maleic acid~
maleic anhydride, crotonic acidg allylacetic acid, allylpropionic -acid, l-carboxy-l-ethyl ethylene, l-carboxy-l-propyl ethylene, ethylacrylic acid, propylacrylic acid~ butylacrylic acid, ethylmaleic acid~ and methylmaleic acid.
The olefinic hydrocarbon to form a copolymer with such a carboxylic acid or anhydride is chosen from the hydrocarbons~
such as ethylen~ propylene~ butylene~ amyIene~ and hexylene~
having rom 2 to 6 carbon atoms in the molecule. An olefinic hydrocarbon with 7 or more carbon atoms will not only impart excessive viscosity to the resulting rust preventive composi-tion but also have other undesirable effects upon the use o the composition.
In synthesizing the homopolymer and copolymer rom the hydrocarbons7 the usual polymerization reaction may be used.
In any case, the homopolymer, copolymer~ or their mixture - thus obtained alone will not be able -to form a water-soluble . . .
6i3~L
rust preventive -film. The polymer or polymeric mixture will be able to do so only when it is modified with a solution of alkali, e.g., in water.
When the polymer is mixed in an aqueous solution or the like of an alkali metal salt, e~g.~ sodium hydroxide, and the mixture is treated by heating at a suitable temperature~
e.g.~ in the neighborhood of 70C~ the product will be a ~` viscous liquid at ordinary -temperature. This mixture will work as a water-soluble film-forming rust preventive composi-tion according to the invention.
Exactly what change the polymer does undergo upon the modifying treatment is to be clarified yet~ but it is presumed that at least a part or whole of the carboxyl groups in the polymer produces a carboxylate.
The alkaline agent required for the modification is not limited to the above-mentioned sodium hydroxide. Other alkali metal salts9 such as lithium hydroxide and sodium carbonate, alkali earbh metal salts~ such as magnesium oxalate3 calcium hydroxide~ and barium carbonate, and ammonia may be used as well. Aside from these inorganic alkaline agents, organic ones, such as ethanolamine and hexylamine~ are useful) too.
The water-soluble film-forming rust preventive composi-tion obtained in accordance with the invention occurs as a viscous liquid at ordinary temperature which~ lmlike the conventional compositions of the character, requires no pre-heating to liquid form before application on metal surfaces as of iron and steel products. It may be coated by ordinary air sprayin~ machines as well as by airless spraying equipment~
to form fine resinous coated films on the metal surfaces.
,; , . . . , .~, , . ,: , ' '`''" '' '' ' ' ' ' ' . ' " ' ' ' "' ' . ', " ', ' . ' 613~
These resinous films are thin but capable of inhibiting corrosion ~or long periods of time. Moreover, they are moisture-proof as compared with the conventional coated films, and have no possibility of softening in summer or under high humidity conditions. On the contrary, they exhibit a drying tendency and are able to isolate and protect the metal surfaces from corrosive atmospheres. After having served the purpose of temporary rust prevention, the coated films can be easily removed from the metal surfaces by simple immersion in or washing with water at ordinary temperature.
For added corrosion resistance, the water-soluble film~
- forming rust preventive composition of the invention may contain a small percentage of a known rust inhibitor or inhi-bitors.
The viscous mixture may thus contain one or more inhibi-tors selected from among sodium nitrite7 sodium phosphate, sodium borate, triethanolamine, dicyclohexylamine nitr~te~ and petroleum sulfonate. Such a rust inhibitor, when mixed in the composition and applied on a metal surface will be secured thereto by molecular adsorption or will be passivated thereon~ thus permitting the coated film to display an e~cellent antirust effect for an extended period of time as ~ ~ compared with the film free of the inhibitor.
; The invention is illustrated by the following examples.Specimens (l), (2), and (3) of three embodiments of the water-soluble film-forming rust preventive composition of the invention were prepared in conformity with the compounding recipe~ ~iven in the left column of Table 1. An exemplary procedure for preparation is as follows. First~ a reaction .
' ' ''',' ' : '," ~ '. ~ ' ' .. . . ..
63~d~
vessel is filled with water, and potassium hydroxide and magnesium hydroxide are charged into the vessel. The mixture is heated to 70C~ and a maleic acid-butylene copolymer is added, and all are thoroughly mixed. The mixture will then become transparent or semitransparent. This is the specimen (1). The specimen (2) may be prepared generally in accordance with the above-described procedure. The specimen (3) was obtained by adding sodium nitrite and trie-thanolamine to the mixture o~' the specimen (~) when the latter became transparent or semitransparent.
Table ~ ..
Speci- Compounding recipe of water- Qity Rust men soluble ~ilm-forming rust coated develop No. preventive composition (g/m2) ment _ Maleic anhydride -butylene copolymer lOOg Potassium hydroxide 22 No (1) ~agnesium hydroxide 25 5 rust Water 9 _ Acrylic polymer lOOg (2) Lithium hydroxide 7 40 Barium carbonate 30 Water 650 _ .
Maleic acid -propylene copolymer lOOg Sodium carbonate 30
(3) Calcium hydroxide30 40 ll . .
Sodium nitrite 30 Triethanolamine 40 Water 7 ~34 Test I for corrosion preventive properties:
The specimens (1), (2), and (3) of water-soluble film-forming rust preventive composition prepared in the manner described were applied by air spraying machines on pieces of soft polished steel sheet (SPC-C)~ 150 mm long, 70 mm wide, and 3 mm thick~ and were dried -thereon. The test pieces were suspended in outdoor shed-storage exposure testers for corrosion test for 80 days. The testers were open to the atmosphere but the test pieces therein were kept from rain drops.
~- The results were as given in the rightmost column of Table 1. The tes-t pieces coated with the specimens (1)~ (2), ` and (3) did not rust at all.
During the test period none of the coated films softened.
` 15 After the test the films came off completely from the metal surfaces upon immersion in water at ordinary temperature for about 10 minutes.
For comparison purposes, three different types of ; commercially available slushing compounds were used and tested ~ 20 for corrosion resistance in the same way as above described.
- As can be seen from Table 2 summarizing the results~ the test pieces coated with specimens (4) and (5) rusted but the test piece with a specimen (6) did not.
Following the test the coated films were removed from the test pieces. ~or the removal -the films of the specimens
Sodium nitrite 30 Triethanolamine 40 Water 7 ~34 Test I for corrosion preventive properties:
The specimens (1), (2), and (3) of water-soluble film-forming rust preventive composition prepared in the manner described were applied by air spraying machines on pieces of soft polished steel sheet (SPC-C)~ 150 mm long, 70 mm wide, and 3 mm thick~ and were dried -thereon. The test pieces were suspended in outdoor shed-storage exposure testers for corrosion test for 80 days. The testers were open to the atmosphere but the test pieces therein were kept from rain drops.
~- The results were as given in the rightmost column of Table 1. The tes-t pieces coated with the specimens (1)~ (2), ` and (3) did not rust at all.
During the test period none of the coated films softened.
` 15 After the test the films came off completely from the metal surfaces upon immersion in water at ordinary temperature for about 10 minutes.
For comparison purposes, three different types of ; commercially available slushing compounds were used and tested ~ 20 for corrosion resistance in the same way as above described.
- As can be seen from Table 2 summarizing the results~ the test pieces coated with specimens (4) and (5) rusted but the test piece with a specimen (6) did not.
Following the test the coated films were removed from the test pieces. ~or the removal -the films of the specimens
(4) and (5) requirecl about 20 minutes of immersion in a bath of heated alkali degreaser and subsequent washing with water.
To remove the film of the specimen (6) the procedure just ; described had to be repeatecl twice.
;
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.~ 4 `Table 2 Speci- Type of Qlty Rust men slushing compound coated develop-(4) Slushing compound A 50g 20%
To remove the film of the specimen (6) the procedure just ; described had to be repeatecl twice.
;
': ', , : .
.~ 4 `Table 2 Speci- Type of Qlty Rust men slushing compound coated develop-(4) Slushing compound A 50g 20%
(5) Emulsion slushing 60 40%
compound rust
compound rust
(6) Grease I 100 rust Test II for corrosion preventive properties:
Specimens (1), (2), and (3j of three embodiments of the water-soluble film-forming rust preventive composition prepared from the ingredients shown in Table 1 were used to form antirust films on condenser tube plates of a marine power plant~ each measuring ~.2 meters by 5.0 meters.
Each tube plate was cleaned by a shot blast and one of the specimens was applied by means o-f an airless spraying machine on the metal surface to a film thickness of about 60 microns.
The plant cons-truction was carried out indoors but open to the atmosphere, and welding and other associated operations were performed around those tube plates. In brief~ the environmsnt was more corrosive than those for ordinary tanks.
After the completion of fabrication and assembly of the condenser (which had taken about three months), -the tube plate surfaces were inspected. The -tube plates coated with the specimens (1) and (2) showed slight, practically negligible rust~ an~ the tube plats wi-th the specimen (3)had no -trace of rust.
~ . .
.~
~8~689~
The examples of the other useful compounding recipe of composition in accordance with the present in~ention are as follows.
Specimens (1), (2), and (3j of three embodiments of the water-soluble film-forming rust preventive composition prepared from the ingredients shown in Table 1 were used to form antirust films on condenser tube plates of a marine power plant~ each measuring ~.2 meters by 5.0 meters.
Each tube plate was cleaned by a shot blast and one of the specimens was applied by means o-f an airless spraying machine on the metal surface to a film thickness of about 60 microns.
The plant cons-truction was carried out indoors but open to the atmosphere, and welding and other associated operations were performed around those tube plates. In brief~ the environmsnt was more corrosive than those for ordinary tanks.
After the completion of fabrication and assembly of the condenser (which had taken about three months), -the tube plate surfaces were inspected. The -tube plates coated with the specimens (1) and (2) showed slight, practically negligible rust~ an~ the tube plats wi-th the specimen (3)had no -trace of rust.
~ . .
.~
~8~689~
The examples of the other useful compounding recipe of composition in accordance with the present in~ention are as follows.
(7) Maleic polymerlOOg Magnesium carbonate 31g Monoethanolamine8g Water 650g
(8) Crotonic polymerlOOg Barium hydroxide70g Caustic potash 20g Dicycrohexylammoniumnitri-te 20g Triethanolamine 50g :. Water 600g (~ vaporizable corrosion inhibi.tor)
(9) Acrylic acid-propylene copolymer lOOg Calcium hydroxide 26g Caustic potash lOg Water 650g (lO) Acrylic acid-isobutylene copolymer lOOg ~ Magnesium carbonate 26g : Caustic soda 6g Borax 30g Monoethanolamine40g Water 600g .
As stated in detail above, the water-soluble film-forming rust preverltive composition according to this in~ention .. . .
', ' ' is in liquid form with a suitable viscosity at ordinary temperature for direc-t application to metal surfaces by an air spraying machine. The resulting coated film is highly moisture-resistant and has no possibility o-f so~tening in S summer or in highly humid conditions. It proves rust pre-ventive for a long period of time and, after having fulfilled its purpose of temporary corrosion prevention, the film is simply removed by immersion in or washing with water at ordinary temperature. With these advantages the composition -; 10 of the invention is extensively applicable to various tanks and machineries~ marine or land, to provide temporary anti-rust protection of great practical value.
', .. '.
.;~ .
.~
.
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.
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As stated in detail above, the water-soluble film-forming rust preverltive composition according to this in~ention .. . .
', ' ' is in liquid form with a suitable viscosity at ordinary temperature for direc-t application to metal surfaces by an air spraying machine. The resulting coated film is highly moisture-resistant and has no possibility o-f so~tening in S summer or in highly humid conditions. It proves rust pre-ventive for a long period of time and, after having fulfilled its purpose of temporary corrosion prevention, the film is simply removed by immersion in or washing with water at ordinary temperature. With these advantages the composition -; 10 of the invention is extensively applicable to various tanks and machineries~ marine or land, to provide temporary anti-rust protection of great practical value.
', .. '.
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.~
.
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Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An aqueous solution capable of forming a water soluble rust preventive film on a metal surface, which is a mixture of an aqueous alkaline solution, and at least one of a homopolymer of a hydrocarbon having at least one double bond .
in the molecule and selected from carboxylic acids and anhydrides, and a copolymer of the said hydrocarbon and an ole-finic hydrocarbon having from 2 to 6 carbon atoms per molecule said homopolymer or copolymer having a polymerization degree between about 300 and about 3000.
in the molecule and selected from carboxylic acids and anhydrides, and a copolymer of the said hydrocarbon and an ole-finic hydrocarbon having from 2 to 6 carbon atoms per molecule said homopolymer or copolymer having a polymerization degree between about 300 and about 3000.
2. A composition according to claim 1 wherein said hydrocarbon having at least one double bond and selected from carboxylic acids and anhydrides is at least one hydrocarbon selected from the group consisting of acrylic acid, methacrylic acid, cinnamic acid, maleic acid, and maleic anhydride.
3. A composition according to claim 1 wherein the alkaline agent of said alkaline solution for the modification is at least one selected from the group consisting of alkali metal salts, alkali earth metal salts, ammonia, and organic alkalis.
4. A method of protecting metal surfaces from rust which comprises coating said surface with an aqueous solution as claimed in claim 1, 2 or 3, to form a water soluble film thereon.
5. A method of protecting iron or steel from rust which comprises coating said surface with an aqueous solution as claimed in claim 1, 2 or 3, to form a water soluble film thereon.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP72145/1975 | 1975-06-14 | ||
| JP7214575A JPS5845475B2 (en) | 1975-06-14 | 1975-06-14 | Suiyo Seihi Makugatabou Sabiso Seibutsu |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1084684A true CA1084684A (en) | 1980-09-02 |
Family
ID=13480800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA254,225A Expired CA1084684A (en) | 1975-06-14 | 1976-06-07 | Water-soluble film-forming rust preventive composition |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5845475B2 (en) |
| CA (1) | CA1084684A (en) |
| DE (1) | DE2627030C3 (en) |
| GB (1) | GB1541309A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56113383A (en) * | 1980-02-12 | 1981-09-07 | Toyo Kohan Co Ltd | Production of metal article coated with composite resin layer excellent in corrosion resistance |
| DE19636077A1 (en) * | 1996-09-05 | 1998-03-12 | Basf Ag | Use of aqueous polymer dispersions for the corrosion protection of metallic surfaces |
-
1975
- 1975-06-14 JP JP7214575A patent/JPS5845475B2/en not_active Expired
-
1976
- 1976-06-07 CA CA254,225A patent/CA1084684A/en not_active Expired
- 1976-06-14 GB GB2458076A patent/GB1541309A/en not_active Expired
- 1976-06-14 DE DE19762627030 patent/DE2627030C3/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS51147441A (en) | 1976-12-17 |
| GB1541309A (en) | 1979-02-28 |
| DE2627030A1 (en) | 1976-12-23 |
| DE2627030B2 (en) | 1978-02-16 |
| JPS5845475B2 (en) | 1983-10-11 |
| DE2627030C3 (en) | 1978-10-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |