JP5052454B2 - Anti-corrosion paint for aerosol spray can and daily simple repair method using it - Google Patents

Description

  The present invention relates to an anticorrosion paint for aerosol spray cans and a simple daily repair method using the same.

  Since steel structures rust due to corrosive environments such as rainwater and chemicals, they are protected by painting, galvanizing, and the like. However, over time, the anticorrosion coating and plating first deteriorate partially, and the part corrodes in advance. In order to maintain the steel structure, in general, inspection is performed on a daily basis, and partial repair is performed for rusting that partially appears. If there are a lot of partial repairs, we will commission a specialist painter to perform thorough repairs, but if there are few such repairs, the inspector himself will be able to perform partial repairs by applying the ground treatment and painting on the spot. Many.

  When a daily inspector himself / herself performs partial repairs, it is difficult to obtain power supply or compressor air directly at the site as a ground treatment for rusted parts, so electric or air-driven Thunder Keren is rarely used. Hand keren with a wire brush is performed. Here, kelen is substrate adjustment. Specifically, it removes the rusted part of the rusted part of the steel structure, roughens the surface of the old paint film, and prevents rust. This means that the coating film that has become brittle due to loss of the film is removed. Keren is classified into 1 type, 2 types and 3 types, and 1 type kelen removes rust and paint film to make a clean steel surface. 2 type kelen removes rust and paint film. To expose the steel surface (however, rust and paint film remain in the indented part and narrow part), and to remove the rust and the deteriorated paint film, and to expose the steel material surface with Class 3 Keren. , Meaning each.

  The surface treatment is preferably performed up to about two types of keren, but it is difficult with hand kelen, and the coating is performed with a substantial amount of rust remaining. When coating such a poor keren surface, it is recommended to undercoat, for example, a rust surface penetrating epoxy resin coating for 2-3 types of keren, which has high permeability and excellent adhesion to the rust surface. . This paint consists of a main agent mainly composed of epoxy resin and a curing agent mainly composed of polyamine. These are mixed at a predetermined ratio and further diluted with a thinner to further increase the rust surface permeability. It is used for painting. The coating material that has penetrated the rust surface causes a curing reaction between the epoxy resin in the main agent and the amine in the curing agent, thereby forming a coating film that is stronger and has superior substrate adhesion and corrosion resistance.

  However, when this rust surface penetration type epoxy resin paint is used for repair coating, it involves complicated procedures such as weighing and mixing of the main agent and curing agent on site, thinner dilution, painting with a brush, and brush washing after completion of painting. When it is necessary to work, especially when repairing steel structures installed in mountainous areas such as dams and power transmission towers, it takes time to bring tools such as weighing equipment and paint cans to the site. As a result, it was practically difficult to adopt as a paint for repairs by daily inspectors.

  Therefore, in general, the repair coating performed by the daily inspector is simply and quickly repaired by spraying an aerosol type spray can paint made of a non-crosslinked resin composition after hand cleansing. . However, in such a spray can paint, compared with the above-mentioned 2-3 types of rust surface penetration type epoxy resin paint for keren, it is remarkably inferior in anticorrosion, especially when it is applied to a poor surface condition such as hand kelen, Due to the poor adhesion to the substrate, the anti-corrosion performance due to daily repairs at the corners could not be demonstrated, and there was a problem that the coating film peeled off early after the repair coating.

  In view of the above, there has been a demand for the development of a spray can coating that can perform high-level anticorrosion repair on steel structures and the like, and that can be easily and quickly repaired daily.

  The object of the present invention is to provide an anticorrosion paint for aerosol spray cans, which is excellent in storage stability, and can form a coating film excellent in adhesion to the substrate, permeability to rust surface, corrosion resistance, weather resistance, and the like. The purpose is to provide a simple daily repair method.

  As a result of intensive studies, the inventor has found that the above object can be achieved according to the anticorrosion paint for aerosol spray cans containing a specific organic solvent type one-part anticorrosion paint, an auxiliary organic solvent and a propellant, and further, The inventors have found that the atomization is good without decreasing the solubility, and have completed the present invention based on this.

  That is, the present invention relates to the following anticorrosion paint for aerosol spray cans and a daily simple repair method using the same.

1. (A) An organic solvent-type anticorrosive coating that is cross-linked and cured by moisture in the atmosphere, the cross-linkable functional group-containing resin (a), and a cross-linkable group that reacts with the cross-linkable functional group in the resin (a) as necessary. One-component anticorrosion paint containing agent (b),
An anticorrosive paint for aerosol spray cans, comprising (B) an auxiliary organic solvent and (C) a propellant.

  2. Item 2. The aerosol spray can according to item 1, wherein the one-pack type anticorrosive paint (A) is an organic solvent type anticorrosive paint containing an epoxy resin as the crosslinkable functional group-containing resin (a) and a ketimine compound as the crosslinker (b). Anticorrosion paint.

  3. The anticorrosion paint for aerosol spray cans according to Item 2, wherein a glycol ether solvent is used as the auxiliary organic solvent (B) and dimethyl ether is used as the propellant.

  4). The anti-corrosion paint for aerosol spray cans according to Item 1, wherein the one-pack type anti-corrosion paint (A) is an organic solvent-type anti-corrosion paint containing a moisture-curable urethane resin as the crosslinkable functional group-containing resin (a).

  5). Item 5. The anticorrosion paint for aerosol spray cans according to item 4, wherein the one-pack type anticorrosion paint (A) is an anticorrosion paint containing a moisture-curing urethane resin and an amorphous water rust preventive pigment.

  6). The anti-corrosion paint for aerosol spray cans according to Item 5, wherein the one-pack type anti-corrosion paint (A) is an anti-corrosion paint containing a moisture curable urethane resin, an amorphous water rust preventive pigment and a silane coupling agent.

  7). The anticorrosion paint for aerosol spray cans according to the above item 4, wherein a glycol ether solvent is used as the auxiliary organic solvent (B) and dimethyl ether is used as the propellant (C).

  8). 8. A daily simple repair method characterized in that the anticorrosion paint for aerosol spray cans according to any one of the above items 1 to 7 is applied to a steel structure surface or a partial repair site on the coating surface thereof.

  9. The coating of the aerosol spray can for anticorrosion according to any one of claims 1 to 7 on the surface of the steel structure or the partial repair site of the coating film surface, and then applying the top coating for the aerosol spray can Item 9. Daily simple repair method according to item 8.

  ADVANTAGE OF THE INVENTION According to this invention, the anti-corrosion coating material for aerosol spray cans which is excellent in storage stability and can form the coating film excellent in the adhesiveness with a base material, the permeability to a rust surface, corrosion resistance, a weather resistance, etc. is obtained. The paint for spray cans according to the present invention does not decrease the solubility of paint components, and can maintain a good atomization state and expression of coating film performance over a long period of time if stored at an appropriate temperature and humidity.

  Therefore, if the paint for spray cans of the present invention is used, repair coating at the time of daily inspection can be performed easily and quickly. Furthermore, the choking phenomenon etc. can be suppressed by applying the top coating material for spray cans excellent in weather resistance to the repair site by the coating material of the present invention.

One-component anticorrosion paint (A)
In the present invention, (A) an organic solvent-type anticorrosive coating that is crosslinked and cured by moisture in the atmosphere, the crosslinkable functional group-containing resin (a), and if necessary, the crosslinkable functional group in the resin (a) As a one-component anticorrosion paint containing a crosslinking agent (b) that reacts with water, any conventionally known anticorrosion paint can be used as long as it is an anticorrosion paint that initiates a crosslinking reaction by reacting with moisture in the atmosphere and the paint components and cures. Room temperature curable paints and thermosetting paints can be used.

One-component anti-corrosion paint (A-1)
As the one-pack type anticorrosive paint (A), an organic solvent-type paint (hereinafter referred to as paint (A-1) in which the crosslinkable functional group-containing resin (a) is an epoxy resin and the crosslinker (b) is a ketimine compound. Can be suitably used.

  The epoxy resin is an epoxy resin containing 2 or more, preferably 2 to 5, epoxy groups in one molecule, having a number average molecular weight of about 350 to 3,000 and an epoxy equivalent of about 80 to 1,000. Those are preferred.

  As an example of the said suitable epoxy resin, the epoxy resin obtained by making polyhydric alcohol, a polyhydric phenol, etc. react with excess epichlorohydrin or alkylene oxide can be mentioned.

  Examples of the polyhydric alcohol include ethylene glycol, polyethylene glycol, propylene glycol, neopentyl glycol, butylene glycol, hexanediol, glycerin, trimethylolethane, trimethylolpropane, pentaerythritol, diglycerol, sorbitol and the like. Examples of polyhydric phenols include 2,2-bis (4-hydroxyphenyl) propane [bisphenol A], halogenated bisphenol A, 4,4-dihydroxydiphenylmethane [bisphenol F], and tris (4-hydroxyphenyl). Examples include propane, resorcin, tetrahydroxydiphenylethane, novolac type polyhydric phenol, cresol type polyhydric phenol, and the like.

  Other examples of the preferred epoxy resin include 1,2,3-tris (2,3-epoxypropoxy) propane, diglycidyl phthalate, diglycidyl hexahydrophthalate, and diglycidyl tetrahydrophthalate. Ester, dimer acid diglycidyl ester, tetraglycidylaminodiphenylmethane, 3,4-epoxy-6-methylcyclohexylmethyl carboxylate, triglycidyl isocyanurate, 3,4-epoxycyclohexylmethyl carboxylate, polypropylene glycol diglycidyl ether, etc. It is done.

  The ketimine compound in the paint (A-1) is a curing agent for the epoxy resin, and is a polyamine compound having at least one primary amino group blocked by a carbonyl compound in one molecule. Is included. The “primary amino group blocked with a carbonyl compound” is a protected amino group that can be easily hydrolyzed to a free primary amino group, for example, in the presence of moisture, Formula (I)

(Wherein R ¹ represents a hydrogen atom or a monovalent hydrocarbon group such as an alkyl group or a cycloalkyl group, and R ² represents a monovalent hydrocarbon group such as an alkyl group or a cycloalkyl group). be able to. Here, the case where R ¹ is a hydrogen atom is an aldimine compound.

  The polyamine compound may be aliphatic, alicyclic, or aromatic. Moreover, as long as it has a primary amino group, polyamides may be used. The polyamine compound must have a primary amino group that undergoes a curing reaction with the epoxy resin, but is generally less than about 2,000, preferably in the range of about 30 to about 1,000 primary amino groups. It is advantageous to have a group equivalent. The polyamine compound generally has a number average molecular weight in the range of about 5,000 or less, preferably about 3,000 or less.

  Examples of the polyamine compound include aliphatic polyamines such as ethylenediamine, propylenediamine, butylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, and pentaethylenehexamine; aromatic polyamines such as metaxylenediamine, diaminodiphenylmethane, and phenylenediamine; Examples include alicyclic polyamines such as isophoronediamine, cyclohexylpropylamine, norbornenediamine; and polyamides having a primary amino group at the molecular end.

  Among the polyamine compounds, a polyamine compound that does not contain a secondary amino group in the molecule, that is, has only a ketiminated primary amino group is particularly preferable because of its good storage stability after mixing with an epoxy resin. is there. Therefore, when a ketimine compound having a secondary amino group in the molecule is used, it is desirable to use it as an adduct compound obtained by reacting the secondary amino group with the above-described epoxy resin.

  Examples of the carbonyl compound that can be used to ketiminate the polyamine compound include any commonly used ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, methyl isopropyl ketone, diisobutyl ketone, methyl t-butyl ketone, and cyclohexanone. It is done. Moreover, aldehydes, such as acetaldehyde and benzaldehyde, can be used as a carbonyl compound used for aldiminating a polyamine compound.

  The reaction between the polyamine compound and the carbonyl compound can be carried out by a method known per se, and the quantitative ratio and reaction conditions are such that substantially all of the primary amino groups present react with the carbonyl compound. It is desirable to use it. The reaction is a dehydration reaction, and in order to proceed easily, it is generally advantageous to use a ketone having poor water solubility and low steric hindrance such as methyl isobutyl ketone and methyl ethyl ketone as the carbonyl compound. is there.

  The proportion of the ketimine compound is such that the active hydrogen of the ketimine compound is 0.5 to 5.0 equivalents, preferably 0.6 to 3.0 equivalents per equivalent of epoxy group in the epoxy resin. It is desirable to use in. When the amount is less than 0.5 equivalent, curing is insufficient. When the amount is more than 5.0 equivalent, the cured coating film remains tacky, which may cause a problem in anticorrosion.

  In the one-pack type anticorrosive paint (A-1) which is a crosslinking system of the epoxy resin and the ketimine compound, in order to improve the drying property of the coating film, a urethane-modified epoxy resin and / or, if necessary, Resins that are solid at room temperature selected from the group consisting of xylene resins, toluene resins, ketone resins, coumarone resins, and petroleum resins can be blended. In particular, it is preferable to use a urethane-modified epoxy resin because adhesion to various materials (iron, non-ferrous metal, non-metal) is improved.

  Examples of the urethane-modified epoxy resin include those obtained by reacting an amine-added epoxy resin obtained by reacting an amine with an epoxy resin and a polyisocyanate compound or a monoisocyanate compound.

  As the epoxy resin, those similar to the epoxy resin as the component (a) can be used, and as the amines, alkanolamines, aliphatic amines, aromatic amines, alicyclic amines, and the like can be used. . As the polyisocyanate compound, conventionally known aliphatic, aromatic or alicyclic polyisocyanate compounds can be used, and as the monoisocyanate compound, aliphatic monoamine or aromatic monoamine reacted with phosgene, or diisocyanate compound. Those obtained by reacting one isocyanate group with a hydroxyl group-containing compound can be used.

  The urethane-modified epoxy resin has a number average molecular weight of 1,000 to 65,000, preferably 2,000 to 25,000. When the number average molecular weight is less than 1,000, the adhesion and water resistance are lowered. On the other hand, when the number average molecular weight exceeds 65,000, the viscosity is increased and workability and storage stability may be adversely affected.

  When the urethane-modified epoxy resin is used, the blending ratio is 5 to 95 parts by weight, preferably 10 to 90 parts by weight, based on 100 parts by weight of the epoxy resin as the component (a) in the resin solid content ratio. It is.

  On the other hand, a resin selected from a xylene resin, a toluene resin, a ketone resin, a coumarone resin and a petroleum resin is a resin which is solid at room temperature and has a melting point of 60 ° C or higher, preferably 70 to 140 ° C. Can be used in combination with more than one species. The blending ratio when the resin is used is 5 to 70 parts by weight, preferably 10 to 50 parts by weight, based on 100 parts by weight of the epoxy resin as the component (a) in terms of resin solid content.

  From the viewpoint of ensuring storage stability, it is desirable that a dehydrating agent is blended in the one-pack type anticorrosive paint (A-1), which is a crosslinking system of the epoxy resin and the ketimine compound, as necessary. As the dehydrating agent, conventionally known dehydrating agents can be used without particular limitation, and typical examples thereof include the following.

  (i) Metal oxides or carbonized substances rich in powder and porous; for example, synthetic silica, activated alumina, zeolite, activated carbon and the like.

(ii) Calcium compounds having a composition such as CaSO ₄ , CaSO ₄ .1 / 2H ₂ O, CaO; for example, calcined gypsum, soluble gypsum, quick lime, and the like.

  (iii) Metal alkoxides; for example, aluminum isopropylate, aluminum-sec-butyrate, tetraisopropyl titanate, tetra-n-butyl titanate, zirconium-2-propylate, zirconium-n-butyrate, ethyl silicate and the like.

  (iv) Organic alkoxy compounds; for example, methyl orthoformate, ethyl orthoformate, dimethoxypropane, vinyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane and the like.

  (v) Monofunctional isocyanates; for example, methyl isocyanate, ethyl isocyanate, propyl isocyanate, “Additive TI” (trade name, manufactured by Sumitomo Bayer Urethane Co., Ltd.) and the like.

  These dehydrating agents can be used alone or in combination of two or more. The amount of the dehydrating agent used varies depending on the amount of water contained in the coating composition and the absorption, adsorption capacity, or reactivity of the dehydrating agent, but generally the resin solid content in the coating composition is 100 parts by weight. The amount is suitably 0.1 to 25 parts by weight, preferably 0.5 to 15 parts by weight.

  The one-pack type anticorrosion paint (A-1) that is a cross-linking system of the epoxy resin and the ketimine compound is an organic solvent-type paint, and examples of the organic solvent used include aromatics such as toluene, xylene, and mineral spirits. Hydrocarbon solvents; ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone and diisobutyl ketone; ester solvents such as ethyl acetate, n-butyl acetate and isobutyl acetate; alcohol solvents such as ethyl alcohol, propyl alcohol and butyl alcohol Glycol solvents such as ethylene glycol, diethylene glycol, propylene glycol and hexylene glycol; mono- and dialkyl ethers such as methyl ether, ethyl ether, propyl ether and butyl ether of these glycol solvents; Known solvents such as glycol ether solvents, such as acetates and propionates of monoalkyl ether is available. Among these, from the viewpoint of ensuring storage stability as an aerosol paint, a ketone solvent or a glycol ether solvent is preferable.

  For the one-pack type anticorrosive paint (A-1) which is a cross-linking system of the epoxy resin and the ketimine compound, pigments such as coloring pigments, extender pigments, metal powders, rust preventive pigments; In addition, additives such as plasticizers, fillers, and dispersants may be mixed and used.

  Examples of the color pigment include inorganic color pigments such as titanium oxide, zinc white, iron oxide, and yellow lead, and organic color pigments such as phthalocyanine blue and benzidine yellow. In addition, examples of extender pigments include quartz powder, talc, alumina oxide, calcium carbonate, and precipitated barium sulfate, and examples of metal powder include stainless steel powder, zinc powder, aluminum powder, bronze powder, and mica powder. Can do.

One-component anticorrosion paint (A-2)
As the one-pack type anticorrosive paint (A) in the present invention, an organic solvent-type paint (hereinafter referred to as paint (A-2)) in which the crosslinkable functional group-containing resin (a) is a moisture-curable urethane resin. Is preferred). The paint (A-2) preferably contains a moisture curable urethane resin and an amorphous water rust preventive pigment, and further contains a moisture curable urethane resin, an amorphous water rust preventive pigment and a silane coupling agent. It is more preferable.

  As said moisture hardening type urethane resin, a conventionally well-known moisture hardening type urethane resin is not specifically limited, Various things can be used. As such a moisture curable urethane resin, for example, an isocyanate-terminated urethane prepolymer obtained by reacting a polyol and a polyisocyanate compound can be suitably used.

  As the polyol, polyether polyol or polyolefin polyol can be used.

  As the polyether polyol, ethylene glycol, propylene glycol, butanediol, diethylene glycol, glycerin, hexanediol, hexanetriol, glycerin, trimethylolpropane, pentaerythritol and the like have two or more hydroxyl groups such as 2-6, preferably The polyol having 2 to 4 carbon atoms having 2 to 8 carbon atoms, preferably 2 to 6 carbon atoms, such as ethylene oxide, propylene oxide, butylene oxide, tetrahydrofuran, etc., for example, 2 to 8 carbon atoms, preferably 2 to 2 carbon atoms. It is appropriate to use a polyalkylene polyol having 2 to 4 active hydrogen groups (hydroxyl groups) in the molecule obtained by addition polymerization of 6 alkylene oxides in the presence of an alkali catalyst or the like.

  Examples of the polyolefin polyol include 2 to 4 active hydrogen atoms in a molecule obtained by addition polymerization of, for example, an alkylene oxide such as ethylene oxide, propylene oxide, butylene oxide, and tetrahydrofuran to a diene compound such as butadiene and isoprene. It is appropriate to use a polydiene polyol having a group (hydroxyl group).

  As the polyisocyanate, it is appropriate to use a compound having 2 or more, preferably 2 to 3 isocyanate groups per molecule, so-called polyfunctional isocyanate compound. Specific examples of the polyfunctional isocyanate compound include 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, an isomer mixture of 2,4-toluene diisocyanate and 2,6-toluene diisocyanate, and 4,4. '-Diphenylmethane diisocyanate (hereinafter referred to as “4,4′-MDI”), a mixture of 4,4′-MDI and 2,4′-diphenylmethane diphenyl diisocyanate (hereinafter referred to as “2,4′-MDI”) For example, the trade name “Luprinate MI” (manufactured by BASF Japan), carbodiimide-modified diphenylmethane diisocyanate, crude MDI, hexamethylene diisocyanate (hereinafter “HMDI”), xylylene diisocyanate (hereinafter “XDI”), metaxylylene Diisocyanate compounds such as isocyanate, 1,5-naphthalene diisocyanate, hydrogenated diphenylmethane diisocyanate, hydrogenated toluylene diisocyanate, hydrogenated xylylene diisocyanate, isophorone diisocyanate; “Sumijour N” (trade name, manufactured by Sumika Bayer Urethane Co., Ltd.) "Desmodur IL", "Desmodur HL" (both trade names, manufactured by Bayer AG), "Coronate E.H." (trade names, manufactured by Nippon Polyurethane Industry Co., Ltd.), etc. Polyisocyanate compounds having an isocyanate ring: adduct polyisocyanate compounds such as “Sumijour L” (trade name, manufactured by Sumika Bayer Urethane Co., Ltd.), “Coronate HL” (manufactured by Nippon Polyurethane Industry Co., Ltd.), and the like. That. In this invention, these polyisocyanate can be used individually by 1 type or in mixture of 2 or more types.

  The method for synthesizing the moisture curable urethane resin is not particularly limited, and a conventionally known method can be used. Specifically, the moisture curable urethane resin is produced, for example, by polymerizing a polyol and excess polyisocyanate. Excess polyisocyanate means that the isocyanate equivalent is more than the hydroxyl equivalent of the polyol, and the equivalent relationship can be expressed by the NCO / OH ratio. In particular, in order to form a liquid, low-viscosity, moisture-curing urethane resin, the NCO / OH ratio is set to, for example, 2 to 10, preferably 5 to 10 while considering the type of polyol, the number of functional groups, the molecular weight, and the like. It is appropriate to adjust. The polymerization temperature and the polymerization time are not particularly limited, but usually, in order to avoid the influence of moisture, after mixing the polyol and the polyisocyanate under a nitrogen stream, for example, the reaction is performed at 50 to 100 ° C. for 3 to 8 hours. Is appropriate. An appropriate amount of an organic metal salt urethane polymerization catalyst, a stabilizer, a moisture promoter, a polymerization regulator, or the like may be added at any time before, during or after the reaction.

  In the one-pack type organic solvent-type anticorrosive paint (A-2) containing a moisture-curable urethane resin, the solid content weight of the urethane resin is usually 5 to 70% by weight, preferably 10 to 50% by weight, in particular. Preferably, the amount is 20 to 40% by weight.

  The amorphous water rust preventive pigment used in the present invention can be used without particular limitation as long as it is an amorphous water rust preventive pigment. Examples of such rust preventive pigments include rust preventive pigments such as aluminum phosphate, zinc phosphate, zinc phosphite, potassium phosphite, calcium phosphite, aluminum phosphite, and zinc phosphite. However, the present invention is not limited to these, and any other anticorrosive pigment that does not contain crystal water can be used. When using an amorphous water rust preventive pigment, it is usually 5 to 50 parts by weight, preferably 5 parts by weight based on 100 parts by weight of the moisture curable urethane resin in the one-part anticorrosive paint (A-2). It is suitable to use in an amount of -30 parts by weight, particularly preferably 10-20 parts by weight.

  As the silane coupling agent used in the present invention, various materials can be used as long as they are conventionally used in the field of paints. Examples of such silane coupling agents include epoxy such as γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, and β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane. Silane, vinyltriethoxysilane, vinyltrimethoxysilane, γ-methacryloxytrimethoxysilane and other vinylsilanes, γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane Amino silane such as γ-mercaptopropyltrimethoxysilane, etc. can be used.

  When a silane coupling agent is used, it is usually 1 to 25 parts by weight, preferably 1 to 100 parts by weight based on 100 parts by weight of the moisture-curable urethane resin in the one-part anticorrosive paint (A-2). It is suitable to use in an amount of 15 parts by weight, particularly preferably 2 to 8 parts by weight.

  The one-component organic solvent-type anticorrosion paint (A-2) contains the moisture-curable urethane resin as an essential component, and if necessary, blends the non-crystalline water rust preventive pigment and the silane coupling agent. Depending on the case, coloring pigments, extender pigments, metal powders and the like can be blended.

  Specifically, inorganic coloring pigments such as titanium oxide, zinc white, iron oxide, and yellow lead, organic coloring pigments such as phthalocyanine blue and benzidine yellow, quartz powder, talc, alumina oxide, calcium carbonate, precipitated barium sulfate, etc. Representative examples include extender pigments, stainless steel powder, zinc powder, aluminum powder, bronze powder, metal powder such as mica powder, and the like.

  Examples of the organic solvent used in the one-pack type anticorrosion paint (A-2) include hydrocarbon solvents such as toluene and xylene; ester solvents such as ethyl acetate and butyl acetate; methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, Ketone solvents such as isophorone; alcohol solvents such as methanol, ethanol and butanol; glycol solvents such as ethylene glycol, diethylene glycol, propylene glycol and hexylene glycol; methyl glycol, ethyl ether, propyl ether and butyl ether of these glycol solvents Typical examples thereof include monoalkyl ethers and dialkyl ethers such as glycol ether solvents such as acetates and propionates of monoalkyl ethers. Of these, hydrocarbon solvents and further glycol ether solvents are preferred from the viewpoint of ensuring storage stability as aerosol paints.

  In addition, the one-pack type anticorrosive paint (A-2) may further include other additives as necessary, for example, a surface conditioner, a dispersant, an ultraviolet absorber, a dehydrating agent, an anti-settling agent, and an anti-sagging agent. Additives that are generally known as additives for paints such as agents, thickeners, reaction control catalysts, and the like can be blended.

In the present invention, an auxiliary organic solvent (B) and a propellant (C) are added to the above one-component anticorrosive paint (A), adjusted to an appropriate viscosity, and filled in an aerosol container. An anticorrosive paint for aerosol spray can be obtained.

  The auxiliary organic solvent (B) is not particularly limited as long as it is an organic solvent having a flash point of 0 ° C. or higher. For example, hydrocarbon solvents such as toluene, xylene and mineral spirits; ketone solvents such as methyl isobutyl ketone; Ester solvents such as ethyl, butyl acetate and amyl acetate; ether solvents such as dioxane; glycol solvents such as ethylene glycol, diethylene glycol, propylene glycol and hexylene glycol; methyl glycol, ethyl ether and propyl ether of these glycol solvents And monoalkyl ethers and dialkyl ethers such as butyl ether, and glycol ether solvents such as acetates and propionates of monoalkyl ethers. These can be used alone or in combination of two or more, and it is desirable from the viewpoint of safety that the flash point of the whole organic solvent in the anticorrosive paint for aerosol spray is preferably 21 ° C. or higher. Of these, glycol ether solvents are preferred from the standpoint of ensuring storage stability, particularly as aerosol paints.

  The auxiliary organic solvent (B) is used in an amount of 5% to 35% by weight, preferably 15% to 25% by weight in the coating liquid obtained by mixing the one-part anticorrosive paint (A) and the auxiliary organic solvent (B). It is desirable that the amount be If the amount is less than 5% by weight, the aerosol sprayability is inferior. If the amount is more than 35% by weight, the storage property is inferior.

  As a propellant (C), well-known dimethyl ether, LP gas, etc. can be used individually or in mixture, and especially dimethyl ether is suitable from the point of the solubility of a coating material and atomization property.

  The amount of the propellant (C) used is a volume ratio with respect to the paint liquid obtained by mixing the one-component anticorrosive paint (A) and the auxiliary organic solvent (B), and the paint liquid: propellant (C) = 55: 45-30. : It is preferable to be within the range of 70.

  When filling each of the above components into an aerosol container, it is desirable to work so that moisture does not enter. It is desirable to control the amount of water to be about 750 PPM or less, preferably 500 PPM or less. In addition to the above-described blending of the dehydrating agent, the moisture mixing can be controlled by previously dehydrating each raw material in the paint.

  The above-described anti-corrosion paint for aerosol spray of the present invention can be suitably used for anti-corrosion repair of metal structures such as steel structures.

Daily Simple Repair Method The daily simple repair method of the present invention is to apply the above-mentioned anticorrosion paint for aerosol spray cans on the surface of a steel structure or a partial repair site of its coating film surface.

  That is, the anticorrosion paint for aerosol spray cans of the present invention can be easily and easily repaired daily and routinely by applying aerosol coating on the surface of the steel structure or the partial repair site of the coating surface. In the case where rust is generated at the repaired part, it is possible to appropriately perform base treatment such as hand cleansing with a wire brush or the like as necessary before painting.

  In addition, in order to impart weather resistance to the repaired part, after applying the above-mentioned anticorrosive paint for aerosol spray cans, a spray can top coat based on a top coat having excellent weather resistance can be applied.

  Hereinafter, the present invention will be described more specifically with reference to production examples, examples and comparative examples. However, the present invention is not limited by these examples. In each example, “parts” and “%” indicate “parts by weight” and “% by weight”.

Production Example 1 Production of one-part anticorrosion paint (A-1) In a 2 liter container, 100 parts of epoxy resin liquid (Note 1), 175 parts of urethane-modified epoxy resin liquid (Note 2), 30 parts of vinyltrimethoxysilane, 375 parts of magnesium acid, 110 parts of titanium dioxide, 235 parts of xylene, 70 parts of methyl isobutyl ketone, 30 parts of butyl cellosolve are sequentially charged, mixed with a disper, and 60 μm or less with a degree of dispersion specified in JIS K-5600 using a sand mill. Then, 10 parts of a ketimine compound (Note 3) was added after addition and mixed and stirred with a disper to obtain a one-pack type anticorrosive paint (A-1).

The above (Note 1) to (Note 3) are as follows.
(Note 1) 70% toluene solution of “Epicoat 1001” (trade name, manufactured by Yuka Shell Chemical Co., Ltd., solid),
(Note 2) “Arachid 9203” (trade name, manufactured by Arakawa Chemical Co., Ltd., solid content 40%, diisocyanate reaction product of amine-added epoxy resin),
(Note 3) “Versamine K-13” (trade name, manufactured by Cognis Japan, a ketimine compound of polyethylene polyamine whose secondary amino group is an epoxy adduct).

Production Example 2 Production of one-part anticorrosion paint (A-2) In a 2 liter container, 100 parts of xylene resin (Note 4), 310 parts of moisture curable urethane resin (Note 5), amorphous water rust preventive pigment (Note 6) 50 parts, 80 parts of titanium dioxide, 250 parts of talc, 80 parts of dehydrating agent (Note 7) and 145 parts of xylene are sequentially added, mixed with a disper, and 60 μm at a dispersity specified in JIS K-5600 in a pot mill. Dispersed to the following to obtain a one-pack type anticorrosive paint (A-2-1).

The above (Note 4) to (Note 7) are as follows.
(Note 4) “Nikanol LLL” (trade name, manufactured by Mitsubishi Gas Chemical Industries, Ltd., xylene / formaldehyde resin),
(Note 5) “Sumijour E21-1” (trade name, manufactured by Sumika Bayer Urethane Co., Ltd.)
(Note 6) “K White # 94” (trade name, manufactured by Teika)
(Note 7) “Additive TI” (trade name, manufactured by Sumika Bayer Urethane Co., Ltd.).

Production Example 3
In a 2 liter container, 100 parts of xylene resin (Note 4), 310 parts of moisture curable urethane resin (Note 5), 50 parts of non-crystalline water rust preventive pigment (Note 6), 80 parts of titanium dioxide, 250 parts of talc, dehydrating agent ( Note 7) 80 parts, 145 parts of xylene, and 5 parts of silane coupling agent (Note 8) are charged in order, mixed with a disper, and dispersed in a pot mill at a degree of dispersion specified in JIS K-5600 to 60 μm or less. Thus, a one-pack type anticorrosive paint (A-2-2) was obtained.

The above (Note 4) to (Note 7) are as described above. (Note 8) is as follows.
(Note 8) “KBM-403” (trade name, manufactured by Shin-Etsu Silicone Co., Ltd.).

Reference Example 1 Preparation of anticorrosion paint for aerosol spray can The anticorrosion paint (A-1) obtained in Production Example 1 was diluted by adding 250 parts of ethylene glycol monobutyl ether as an auxiliary organic solvent, and this diluted paint and dimethyl ether were further diluted. An aerosol container was filled in an aerosol container at a volume ratio of 1: 1 to obtain an anticorrosion paint for aerosol spray cans.

Examples 1 and 2 Preparation of anticorrosion paint for aerosol spray cans In the anticorrosion paint (A-2-1) or anticorrosion paint (A-2-2) obtained in Production Example 2 or 3, propylene glycol monomethyl ether as an auxiliary organic solvent 250 parts of acetate was added for dilution, and the diluted paint and dimethyl ether were filled in an aerosol container at a volume ratio of 1: 1 to obtain an anticorrosive paint for aerosol spray cans.

Comparative Example 1
“Rabatect CP primer” (trade name, manufactured by Kansai Paint Co., Ltd., non-crosslinked lacquer paint) was filled in an aerosol container at a volume ratio of 1: 1 with dimethyl ether to prepare an aerosol spray can paint.

Comparative Example 2
“Vinylose Red Primer” (trade name, manufactured by Dainippon Paint Co., Ltd., non-cross-linked lacquer paint) is filled into an aerosol container at a ratio of 1: 1 with dimethyl ether to provide an anticorrosive paint for aerosol spray cans. did.

Reference Example 1 for each coating composition obtained in Examples 1-2 and Comparative Examples 1-2 were subjected to performance tests showing storage stability below, clogging of the spray nozzle, the adhesion and corrosion resistance, evaluation did.

  Storage stability: The aerosol spray can coating material filled in the aerosol container was observed in a 40 ° C., 50% RH atmosphere for changes in the coating solution after storage for 1 month, and evaluated according to the following criteria. ◯ indicates no abnormality, Δ indicates thickening or sedimentation, and x indicates gelation.

  Spray nozzle clogging: The sprayability after storage for one month in an atmosphere of 40 ° C. and 50% RH was examined and evaluated according to the following criteria. ○ indicates that the entire amount can be sprayed and there is no abnormality, and × indicates that the nozzle is clogged.

  Adhesiveness: As a base material, 4 types of 1 type keren, 2 type keren, 3 type keren and galvanized steel plate are used, and the above-mentioned paint is applied to the surface of each substrate by aerosol, and 20 ° C. and 65% RH. Each test coated plate was prepared by drying in an atmosphere for 7 days. After putting these test coated plates into a moisture resistance tester (50 ° C., relative humidity 95% or more) for 240 hours, immediately after taking out, after cross-cutting according to JIS K-5400, an adhesive tape adhesion test was conducted, and the following standards were applied. It was evaluated with. ○ indicates that the coating film is not peeled off and that the adhesion is good, Δ indicates that the coating film is partially peeled off and adhesion is somewhat poor, and × indicates that the coating film is peeled over the entire surface and adhesion is poor.

  Anticorrosion: Cross cut scratches were put with a knife on the coating surface of each test coating plate prepared in the same manner as in the case of the above adhesion. The test coated plate was subjected to a salt spray test at 35 ° C. for 240 hours, and the occurrence of rust and swelling was observed and evaluated according to the following criteria. ○ indicates no abnormality and good anticorrosion properties, Δ indicates partial rust and blistering, and corrosion resistance is somewhat poor, and × indicates rust and blistering on the entire surface, indicating poor corrosion resistance.

  The results of the performance test are shown in Table 1.

Claims (6)

(A) An organic solvent-type anticorrosive coating that is cross-linked and cured by moisture in the atmosphere, containing a moisture-curable urethane resin as the cross-linkable functional group-containing resin (a), and if necessary, in the resin (a) A one-part anticorrosion paint containing a crosslinking agent (b) that reacts with a crosslinkable functional group;
(B) a glycol ether solvent and (C) dimethyl ether , and the content of the propellant (C) is a mixture of the one-part anticorrosion paint (A) and the auxiliary organic solvent (B). An anticorrosive paint for aerosol spray cans, wherein the paint liquid: the propellant (C) is in a range of 55:45 to 30:70 in a volume ratio to the applied paint liquid. The anti-corrosion paint for aerosol spray cans according to claim 1, wherein the one-pack type anti-corrosion paint (A) is an organic solvent-type anti-corrosion paint containing a moisture-curable urethane resin and an amorphous water rust preventive pigment. The anti-corrosion paint for aerosol spray cans according to claim 2, wherein the one-pack type anti-corrosion paint (A) is an organic solvent-type anti-corrosion paint containing a moisture-curable urethane resin, an amorphous water rust preventive pigment and a silane coupling agent. The amount of the auxiliary organic solvent (B), one-corrosion paint (A) and the auxiliary organic solvent (B) of claims 1 to 3, mixed with the paint solution 5 wt% to 35 wt% and comprising an amount The anticorrosion paint for aerosol spray cans according to any one of the above. An everyday simple repair method characterized in that the anticorrosion paint for aerosol spray cans according to any one of claims 1 to 4 is applied to a surface of a steel structure or a partial repair site of a coating film surface thereof. Claim that after applying the anticorrosion paint for aerosol spray cans according to any one of claims 1 to 4 to a steel structure surface or a partial repair site of the coating film surface, further applying a top coat paint for aerosol spray cans Item 6. Daily simple repair method according to item 5 .