CN113637392A - Flow coating epoxy primer and preparation method and application thereof - Google Patents
Flow coating epoxy primer and preparation method and application thereof Download PDFInfo
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- CN113637392A CN113637392A CN202111067073.9A CN202111067073A CN113637392A CN 113637392 A CN113637392 A CN 113637392A CN 202111067073 A CN202111067073 A CN 202111067073A CN 113637392 A CN113637392 A CN 113637392A
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- 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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/44—Amides
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- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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Abstract
The invention provides a curtain coating epoxy primer and a preparation method and application thereof, belonging to the field of primer materials for metals. The flow coating epoxy primer provided by the invention comprises a paint material and a curing agent; the paint comprises the following components in percentage by mass: 29-35% of E-20 bisphenol A epoxy resin, 3-7% of E-44 bisphenol A epoxy resin, 5-15% of anti-rust pigment, 30-50% of pigment filler, 2-19% of organic solvent, 2-6% of active diluent, 1.1-1.7% of rheological agent, 0.5-1.0% of accelerator, 0.4-0.8% of defoaming agent and 0.2-0.5% of dispersing agent; the curing agent comprises the following components in percentage by mass: 60-90% of polyamide resin and 10-40% of organic solvent; the mass ratio of the paint to the curing agent is (4-8): 1. the curtain coating epoxy primer provided by the invention has the advantages of high curing speed, high adhesive force and strength and excellent corrosion resistance after being sprayed on the surface of metal.
Description
Technical Field
The invention relates to the field of primer materials for metals, in particular to a curtain coating epoxy primer and a preparation method and application thereof.
Background
Along with the higher and higher environmental protection requirement, the pollution condition of the coating product to the environment is more and more emphasized, the pollution of toxic and harmful paint mist and solvent in the paint to the air can be greatly reduced by adopting the curtain coating mode for coating, and the harm to the body of coating operators is reduced to the minimum degree.
The epoxy polyamide system primer which is commonly used at present has excellent adhesive force to various substrates, can be applied to the anticorrosive coating of packaging containers made of different materials such as steel, iron, aluminum, alloy and the like, can solve the problem that dead angles cannot be formed in the coating of the packaging containers with complex structures by adopting a curtain coating mode, and can recycle the paint which falls off, thereby greatly saving the cost and reducing the harm of volatile organic compounds by more than 50 percent. For example, chinese patent application CN201110374524.3 discloses a special curtain coating paint using epoxy ester resin as a film forming substance, wherein the epoxy ester is a single-component film forming substance, the curing mechanism is that unsaturated double bonds and carboxyl groups are oxidized by oxygen and cross-linked and cured, the paint cannot be thickly coated, the curing speed is slow, the paint film can form cross-linking strength after being dried for more than seven days, and the paint has poor matching with finish paint and poor comprehensive performance. Chinese patent application CN 201210045352 discloses an ultraviolet light curing low-gloss flow coating and a preparation method thereof, wherein the film forming material of the method is modified bisphenol A epoxy resin and polyester modified acrylate resin, a cross-linking polymerization film forming material consisting of three unsaturated active photosensitive monomers of single functionality, double functionality and tri functionality and a photoinitiator is adopted, the paint film can be cured to form a film under the irradiation of ultraviolet light, although the paint film is relatively environment-friendly, the system can not be used for colored paint and has poor corrosion resistance because the penetrating power of the ultraviolet light to pigment particles is limited.
Therefore, it is desirable to provide a flow-coated epoxy primer with fast curing speed, high adhesion and strength, and good corrosion resistance.
Disclosure of Invention
The invention aims to provide a curtain coating epoxy primer and a preparation method and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a flow coating epoxy primer, which comprises independently subpackaged paint and a curing agent; the paint comprises the following components in percentage by mass: 29-35% of E-20 bisphenol A epoxy resin, 3-7% of E-44 bisphenol A epoxy resin, 5-15% of anti-rust pigment, 30-50% of pigment filler, 2-19% of organic solvent, 2-6% of active diluent, 1.1-1.7% of rheological agent, 0.5-1.0% of accelerator, 0.4-0.8% of defoaming agent and 0.2-0.5% of dispersing agent;
the curing agent comprises the following components in percentage by mass: 60-90% of polyamide resin and 10-40% of organic solvent;
the mass ratio of the paint to the curing agent is (4-8): 1.
preferably, the solid content of the E-20 bisphenol A epoxy resin is 58-62%.
Preferably, the solid content of the E-44 bisphenol A epoxy resin is more than or equal to 99 percent.
Preferably, the rust-preventive pigment is one or two of zinc phosphate, zinc complex phosphate, zinc molybdate hydrate polyphosphate, calcium aluminum complex, calcium aluminum silicate hydrate polyphosphate.
Preferably, the pigment and filler is 3-6 of anatase titanium dioxide, iron oxide red, iron oxide yellow, high-pigment carbon black, sericite, talcum powder, calcium carbonate, silicon micropowder and barium sulfate.
Preferably, the organic solvent in the paint and the curing agent is independently two or more of xylene, n-butanol, isopropanol and cyclohexanone.
Preferably, the reactive diluent is one or more of C12-C14 alcohol glycidyl ethers.
Preferably, the rheological agent comprises a polyamidocarboxylate ionic dispersant and a modified hydrogenated castor oil.
The invention also provides a preparation method of the curtain coating epoxy primer, which comprises the following steps:
(1) mixing E-20 bisphenol A epoxy resin, E-44 bisphenol A epoxy resin and a rheological agent for activation to obtain an activated material;
(2) mixing the activated material obtained in the step (1) with an anti-rust pigment, a pigment filler, an organic solvent, an active diluent, a dispersing agent, a defoaming agent and an accelerator to obtain a premixed paint;
(3) sanding the premixed paint obtained in the step (2) to obtain the paint;
(4) mixing polyamide resin and an organic solvent to obtain a curing agent;
the step (1) and the step (4) are not in sequence.
The invention also provides the application of the curtain coating epoxy primer in the technical scheme or the curtain coating epoxy primer prepared by the preparation method in the technical scheme in a metal packaging container, and after the paint and the curing agent are mixed, the organic solvent is added to adjust the viscosity to 20-40S for curtain coating.
The invention provides a flow coating epoxy primer, which comprises a paint material and a curing agent; the paint comprises the following components in percentage by mass: 29-35% of E-20 bisphenol A epoxy resin, 3-7% of E-44 bisphenol A epoxy resin, 5-15% of anti-rust pigment, 30-50% of pigment filler, 2-19% of organic solvent, 2-6% of active diluent, 1.1-1.7% of rheological agent, 0.5-1.0% of accelerator, 0.4-0.8% of defoaming agent and 0.2-0.5% of dispersing agent; the curing agent comprises the following components in percentage by mass: 60-90% of polyamide resin and 10-40% of organic solvent; the mass ratio of the paint to the curing agent is (4-8): 1. the E-type bisphenol A epoxy resin with two different epoxy values is used as the adhesive resin component of the primer, the epoxy group and the hydroxyl group contained in the E-type bisphenol A epoxy resin can enable a resin cured product to have strong cohesive force and adhesive strength, and the ether bond and the hydroxyl group are polar groups, so that the wetting property and the adhesive force of the primer on the surface of a substrate can be improved; meanwhile, the anti-rust pigment component is added, so that physical anti-rust and chemical anti-rust effects can be achieved on a metal matrix, the protection effect of a paint film on the metal surface is effectively improved, and the primer has a good corrosion resistance effect; in addition, the pigment, the filler and other auxiliary components are added, so that the dispersibility of the components, the stability of a system and the rheological property can be further improved, and the strength and the adhesive force of the primer are improved; in addition, the polyamide resin is selected as the curing agent of the two E-type bisphenol A epoxy resins of the primer, so that the curing speed of the primer can be effectively improved, the crosslinking density can be improved, and the strength and the corrosion resistance of the primer can be further improved.
The results of the examples show that the coating film of the flow-coated epoxy primer provided by the invention has no bubbles, is flat and has good leveling property; when a drying experiment is carried out according to the GB/T2707 standard, the surface drying time (23 ℃, 50% RH) of a paint film can be as low as 18-23 min, and the actual drying time (23 ℃, 50% RH) can be as low as 6-9 h; when a bending experiment (2mm bending axis) is carried out according to the GB/T1731 standard, a paint film does not crack, and paint does not fall at a bending part; when an impact strength (50cm) detection experiment is carried out according to the GB/T1732 standard, an impact paint film does not crack or wrinkle; an adhesive force lattice marking method is 0 grade when the adhesive force detection is respectively carried out on paint films on the surfaces of aluminum alloy substrates, steel products and tinplate substrates according to the GB/T9286 standard; when the damp and heat resistance test (720h) is carried out according to the GB/T1740 standard, the paint film is unchanged; the paint film can resist boiling for 1 hour, the paint film is not changed after the boiling, and the paint film is not changed after a water resistance experiment (7d) is carried out according to the GB/T1733 standard; the salt spray resistance performance (500h) is carried out according to the GB/T1771 standard, and a paint film has no crack, no bubble and no peeling; when an acid resistance (7d, 5 percent sulfuric acid) experiment is carried out according to the GB/T1734 standard, a paint film is unchanged; the paint film has no change when alkali resistance (7d, 5 percent NaOH) experiments are carried out according to the GB9274 standard.
Detailed Description
The invention provides a flow coating epoxy primer, which comprises independently subpackaged paint and a curing agent; the paint comprises the following components in percentage by mass: 29-35% of E-20 bisphenol A epoxy resin, 3-7% of E-44 bisphenol A epoxy resin, 5-15% of anti-rust pigment, 30-50% of pigment filler, 2-19% of organic solvent, 2-6% of active diluent, 1.1-1.7% of rheological agent, 0.5-1.0% of accelerator, 0.4-0.8% of defoaming agent and 0.2-0.5% of dispersing agent;
the curing agent comprises the following components in percentage by mass: 60-90% of polyamide resin and 10-40% of organic solvent;
the mass ratio of the paint to the curing agent is (4-8): 1.
the curtain coating epoxy primer provided by the invention comprises independently packaged paint and a curing agent. The paint vehicle and the curing agent are independently packaged, so that the epoxy primer can be prevented from being crosslinked and cured during storage, and the independently packaged two-component primer can be mixed and crosslinked during use, so that a paint film with high bonding strength is obtained.
The paint comprises 29-35% of E-20 bisphenol A epoxy resin, preferably 30-34%, more preferably 31-33%, and most preferably 32% by mass. The invention adopts E-20 bisphenol A epoxy resin and controls the content of the epoxy resin in the range, thereby being more beneficial to obtaining the primer with high strength and excellent corrosion resistance.
In the invention, the solid content of the E-20 bisphenol A epoxy resin is preferably 58-62%, more preferably 59-61%, and most preferably 60%. According to the invention, the solid content of the E-20 bisphenol A epoxy resin is controlled within the range, so that the mixing uniformity of the resin component and other components is improved, and the curing speed of the primer can be improved, thereby avoiding the problem of curing and cracking of a paint film.
The paint comprises 3-7% of E-44 bisphenol A epoxy resin, preferably 4-6%, more preferably 4.5-5.5%, and most preferably 5% by mass. The invention adopts E-44 bisphenol A epoxy resin and controls the content of the epoxy resin in the range, thereby being more beneficial to obtaining the primer with high strength and excellent corrosion resistance.
In the present invention, the solid content of the E-44 bisphenol A epoxy resin is preferably 99% or more, more preferably 99.9% or more, and most preferably 100%. The solid content of the E-44 bisphenol A epoxy resin is controlled within the range, so that the mixing uniformity of the resin component and other components is improved, and the curing speed of the primer can be improved, so that the problem of curing and cracking of a paint film is avoided.
The paint comprises 5-15% of the anti-rust pigment, preferably 6-13%, more preferably 8-11%, and most preferably 9-10% by mass. According to the invention, through adding the anti-rust pigment and controlling the content of the anti-rust pigment within the range, physical anti-rust and chemical anti-rust effects can be achieved on a metal matrix, and the protection effect of a paint film on the metal surface is effectively improved, so that the primer has a good corrosion resistance effect.
In the present invention, the rust preventive pigment is preferably one or two of zinc phosphate, zinc complex phosphate, zinc molybdate polyphosphate hydrate, calcium aluminum complex, and calcium aluminum silicate polyphosphate hydrate. The invention can ensure better corrosion resistance of the primer and improve the compatibility with other components of the paint by selecting the anti-rust pigment, thereby obtaining the paint which is mixed more uniformly and stably.
The paint comprises 30-50% of pigment and filler, preferably 33-48%, more preferably 35-45%, and most preferably 38-40% by weight. The corrosion resistance of the primer can be effectively improved by adding the pigment and the filler and controlling the content of the pigment and the filler within the range.
In the invention, the pigment and filler is 3-6 of anatase titanium dioxide, iron oxide red, iron oxide yellow, high-pigment carbon black, sericite, talcum powder, calcium carbonate, silicon micropowder and barium sulfate. According to the invention, the color filler of the above kind is selected, so that the corrosion resistance of the cured paint film can be effectively improved while the primer obtains more abundant colors.
The paint comprises 2-19% of organic solvent, preferably 3-7%, more preferably 4.5-5.5%, and most preferably 5% by mass. According to the invention, by adding the organic solvent and controlling the content of the organic solvent within the range, the viscosity and the fluidity of the paint can be adjusted, and the components in the paint can be more uniformly dispersed.
In the present invention, the organic solvent is preferably two or more of xylene, n-butanol, isopropanol and cyclohexanone. The organic solvent of the above kind is selected to ensure that the components of the paint are more uniformly dispersed, and the organic solvent is volatilized during the curing of the primer to prevent the paint film from cracking and wrinkling.
The paint comprises 2-6% of reactive diluent, preferably 2.5-5.5%, more preferably 3-5%, and most preferably 3.5-4.5% by mass. The reactive diluent is added, so that the reactive diluent can participate in the curing reaction of the epoxy resin and becomes a part of a cross-linked network structure of a cured epoxy resin, and the toughness of a cured paint film is effectively improved.
In the invention, the reactive diluent is one or more of C12-C14 alcohol glycidyl ethers. The invention can ensure that more active groups are provided by selecting the reactive diluent, and can further enhance the strength of the epoxy resin during curing.
In the invention, the epoxy value of the reactive diluent is preferably 0.286-0.385 eq/100 g; the organic chlorine content of the active diluent is preferably less than 0.02eq/100 g; the viscosity of the reactive diluent is preferably ≦ 10 mpas. The invention is more beneficial to improving the activity of the paint in the cross-linking reaction by controlling the epoxy value, the organic chlorine content and the viscosity of the reactive diluent, thereby effectively improving the toughness of the cured paint film.
The paint comprises 1.1-1.7% of rheological agent, preferably 0.8-1.2%, more preferably 0.9-1.1%, and most preferably 0.95-1% by mass. According to the invention, the rheological agent is added, and the content of the rheological agent is controlled within the range, so that the rheological property of the primer in the spray coating process can be effectively improved, the spray coating flatness of the paint film is improved, the porosity is reduced, and the corrosion resistance and the strength of the paint film are improved.
In the present invention, the rheological agent comprises a polyamidocarboxylate ionic dispersant and a modified hydrogenated castor oil. According to the invention, the rheological agent comprising the polyamide carboxylate ionic dispersing agent and the modified hydrogenated castor oil is selected, so that the modified hydrogenated castor oil can be activated by the polyamide carboxylate ionic dispersing agent, and the rheological property of the paint is further improved.
In the invention, the mass ratio of the polyamide carboxylate ionic dispersing agent to the modified hydrogenated castor oil is preferably (0.15-0.625): 1, more preferably (0.25 to 0.6): 1, most preferably (0.4 to 0.5): 1. according to the invention, the mass ratio of the polycarboxylate ionic dispersing agent to the modified hydrogenated castor oil is controlled within the range, so that the polycarboxylate ionic dispersing agent can be ensured to have higher activity on the modified hydrogenated castor oil, and the rheological property of the primer is effectively improved.
In the present invention, the polyamidocarboxylate ionic dispersant is preferably Disponer 912 of hammes squat.
In the present invention, the modified castor oil is preferably a modified hydrogenated castor oil Crayvallac ST produced by arkema, france.
The paint comprises 0.5-1.0% of accelerator, preferably 0.55-0.95%, more preferably 0.6-0.9%, and most preferably 0.7-0.8% by mass. According to the invention, the adhesion of the paint film on the surface of the matrix can be effectively improved and the paint film is prevented from falling off easily by adding the accelerator and controlling the content of the accelerator within the range.
In the present invention, the accelerator is preferably an epoxysilane, more preferably gamma- (2, 3-glycidoxy) propyltrimethoxysilane, and most preferably KH-560. The invention is more beneficial to improving the adhesive force of the paint film on the surface of the matrix by selecting the accelerant.
The paint comprises 0.4-0.8% of defoaming agent, preferably 0.45-0.75%, more preferably 0.5-0.7%, and most preferably 0.55-0.65% by mass. According to the invention, the defoaming agent is added, and the content of the defoaming agent is controlled within the range, so that the problem of air bubbles in the paint film can be effectively avoided, and the cured paint film is more compact, and the corrosion resistance and strength of the primer can be improved.
In the present invention, the defoaming agent is preferably a non-silicon acrylate defoaming agent, and more preferably an AFCONA-2270 defoaming agent manufactured by AFCONA of the Netherlands or a VOK-2270 defoaming agent manufactured by VOK of Germany.
The paint comprises 0.2-0.5% of dispersing agent, preferably 0.25-0.45%, more preferably 0.3-0.4%, and most preferably 0.35% by mass. According to the invention, by adding the dispersant and controlling the content of the dispersant within the range, the dispersion uniformity of each component in the paint can be effectively improved, so that the stability of the paint is improved.
In the present invention, the dispersant is preferably BYK-163 dispersant manufactured by Bick, Germany, EFKA-4010 manufactured by BASF, Germany, or AFCONA-4063 manufactured by AFCONA, the Netherlands.
The curing agent comprises 60-90% by mass of polyamide resin, preferably 65-85% by mass of polyamide resin, more preferably 70-80% by mass of polyamide resin, and most preferably 75% by mass of polyamide resin. According to the invention, the polyamide resin is selected as the curing agent of the epoxy resin paint and the content of the polyamide resin is controlled within the range, so that the curing speed of the primer can be effectively increased, the crosslinking density can be increased, and the strength and the corrosion resistance of the primer can be further improved.
The curing agent comprises 10-40% of organic solvent, preferably 15-35%, more preferably 20-30%, and most preferably 25% by mass. According to the invention, the organic solvent is added, and the content of the organic solvent is controlled within the range, so that the viscosity of the curing agent can be effectively improved, and the curing agent and the paint can be uniformly mixed more quickly during use, thereby improving the crosslinking uniformity of the primer and further enabling the paint film to have higher strength and corrosion resistance.
In the present invention, the organic solvent is preferably two or more of xylene, n-butanol, isopropanol and cyclohexanone. The organic solvent is selected to be more beneficial to improving the mixing uniformity of the curing agent and the paint.
In the invention, the mass ratio of the paint to the curing agent is (4-8): 1, preferably (4.5-7.5): 1, more preferably (5-7): 1, most preferably 6: 1. According to the invention, the mass ratio of the paint to the curing agent is controlled within the range, so that the crosslinking density of the epoxy resin in the paint is improved, and the corrosion resistance and the strength of a paint film are improved.
According to the curtain coating epoxy primer provided by the invention, a cured paint film has high strength and excellent corrosion resistance, and is foamless, flat and good in leveling property, high in adhesion on the surface of a matrix, difficult to peel off, non-toxic, safe and environment-friendly.
The invention also provides a preparation method of the curtain coating epoxy primer, which comprises the following steps:
(1) mixing E-20 bisphenol A epoxy resin, E-44 bisphenol A epoxy resin and a rheological agent for activation to obtain an activated material;
(2) mixing the activated material obtained in the step (1) with an anti-rust pigment, a pigment filler, an organic solvent, an active diluent, a dispersing agent, a defoaming agent and an accelerator to obtain a premixed paint;
(3) sanding the premixed paint obtained in the step (2) to obtain the paint;
(4) mixing polyamide resin and an organic solvent to obtain a curing agent;
the step (1) and the step (4) are not in sequence.
The invention mixes E-20 bisphenol A epoxy resin, E-44 bisphenol A epoxy resin and rheological agent for activation to obtain the activated material.
In the present invention, the mixing is preferably performed under stirring conditions; the stirring temperature is preferably 45-55 ℃, and more preferably 50 ℃. According to the invention, the stirring temperature is controlled within the range, so that the rheological agent can generate better activity, and higher activity is obtained.
In the invention, the stirring speed is preferably 1000-2000 rpm, and more preferably 1200-1800 r/min. The invention can make the epoxy resin and the rheological agent mixed more uniformly by controlling the stirring speed, and the epoxy resin and the rheological agent are fully contacted to improve the rheological property of the epoxy resin.
In the invention, the stirring time is preferably 10-30 min, and more preferably 15-20 min. The invention can better regulate and control the activation degree of the activating material by controlling the stirring time, thereby ensuring that the rheological property of the activating material is more excellent.
After the activated paint vehicle is obtained, the activated paint vehicle is mixed with the anti-rust pigment, the pigment and filler, the organic solvent, the active diluent, the dispersant, the defoaming agent and the accelerator to obtain the premixed paint vehicle.
The mixing operation is not particularly limited in the present invention, and the components may be uniformly mixed by a mixing operation known to those skilled in the art.
After the premixed paint vehicle is obtained, the premixed paint vehicle is sanded to obtain the paint vehicle. The invention can further refine the granularity of the anti-rust pigment and the pigment and filler components in the paint by adopting sand grinding, so that the premixed paint system is more uniformly dispersed.
In the present invention, the paint particle size obtained after sanding is preferably 20 microns or less, more preferably 15 microns or less. According to the invention, by controlling the granularity of the paint after sanding within the range, the paint can be ensured to have higher stability, and the paint film is more compact after curing, so that the paint has higher adhesive force and higher strength and corrosion resistance on the surface of a matrix.
The invention mixes polyamide resin and organic solvent to obtain the curing agent.
The mixing operation is not particularly limited in the present invention, and the components may be uniformly mixed by a mixing operation known to those skilled in the art.
In the invention, the process for preparing the paint vehicle and the process for preparing the curing agent are not in sequence.
The preparation method of the curtain coating epoxy primer provided by the invention is more beneficial to controlling the physical characteristics of the primer and the curing agent, and obtaining the independently packaged paint and the curing agent which are respectively uniformly dispersed, and the process is simple, feasible, safe and controllable.
The invention also provides the application of the curtain coating epoxy primer in the technical scheme or the curtain coating epoxy primer prepared by the preparation method in the technical scheme in a metal packaging container, and after the paint and the curing agent are mixed, the organic solvent is added to adjust the viscosity to 20-40S for curtain coating.
In the present invention, the organic solvent is preferably two or more of xylene, n-butanol, isopropanol and cyclohexanone.
The flow coating epoxy primer prepared by the invention is suitable for metal substrates, can especially improve the corrosion resistance of metal packaging containers, has higher strength after being cured, and can provide better protection effect for the metal packaging containers; meanwhile, the paint and the curing agent are mixed, and then the organic solvent is added to adjust the viscosity to 20-40S for spray coating, so that the fluidity of the primer can be improved, the primer is more suitable for obtaining a flat paint film by adopting spray coating, and the primer can be completely dried within 24 hours at normal temperature and can reach higher strength.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
The flow coating epoxy primer of the embodiments 1-4 of the invention is composed of independently packaged paint and curing agent, and the components and the formulation of the paint and the curing agent are shown in table 1.
The preparation method of the flow coating epoxy primer of the embodiments 1-4 of the invention comprises the following steps:
(1) mixing E-20 bisphenol A epoxy resin, E-44 bisphenol A epoxy resin and a rheological agent for activation to obtain an activated material; wherein the mixing mode is stirring, the stirring temperature is 50 ℃, the stirring speed is 1500rpm, and the stirring time is 15 min.
(2) Mixing the activated material obtained in the step (1) with an anti-rust pigment, a pigment filler, an organic solvent, an active diluent, a dispersing agent, a defoaming agent and an accelerator to obtain a premixed paint;
(3) sanding the premixed paint obtained in the step (2) until the fineness of the paint is less than or equal to 20 mu m to obtain the paint;
(4) mixing polyamide resin and an organic solvent to obtain a curing agent;
the step (3) and the step (4) are not in sequence.
The epoxy primer for curtain coating of the embodiments 1 to 4 of the invention is applied to a metal packaging container, the metal packaging containers used in the embodiments 1 to 4 are respectively a tinplate, an aluminum alloy substrate and a steel material, the paint vehicle and the curing agent of the embodiments 1 to 4 are uniformly mixed according to the mass ratio of 6:1, then an organic solvent is added to adjust the viscosity to S, the three metal containers are respectively coated by curtain coating, after the curtain coating is finished, the three metal containers are placed in a constant temperature and humidity chamber (23 ℃, 50%) for airing, and corresponding adjusting time is selected according to the technical indexes shown in the table 2, and the measured technical indexes are shown in the table 2.
TABLE 1 compositions and ratios of independently packaged paint and curing agent in the flow-coated epoxy primer of examples 1-4 of the present invention
TABLE 2 test results of paint film performance of spray coating and curing on the surface of metal packaging container in the embodiments 1-4 of the present invention
As can be seen from Table 2, the coating film of the flow-coated epoxy primer provided by the invention has no bubbles, is flat and has good leveling property; when a drying experiment is carried out according to the GB/T2707 standard, the surface drying time (23 ℃, 50% RH) of a paint film can be as low as 18-23 min, and the actual drying time (23 ℃, 50% RH) can be as low as 6-9 h; when a bending experiment (2mm bending axis) is carried out according to the GB/T1731 standard, a paint film does not crack, and paint does not fall at a bending part; when an impact strength (50cm) detection experiment is carried out according to the GB/T1732 standard, an impact paint film does not crack or wrinkle; an adhesive force lattice marking method is 0 grade when the adhesive force detection is respectively carried out on paint films on the surfaces of aluminum alloy substrates, steel products and tinplate substrates according to the GB/T9286 standard; when the damp and heat resistance test (720h) is carried out according to the GB/T1740 standard, the paint film is unchanged; the paint film can resist boiling for 1 hour, the paint film is not changed after the boiling, and the paint film is not changed after a water resistance experiment (7d) is carried out according to the GB/T1733 standard; the salt spray resistance performance (500h) is carried out according to the GB/T1771 standard, and a paint film has no crack, no bubble and no peeling; when an acid resistance (7d, 5 percent sulfuric acid) experiment is carried out according to the GB/T1734 standard, a paint film is unchanged; the paint film has no change when alkali resistance (7d, 5 percent NaOH) experiments are carried out according to the GB9274 standard.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A flow coating epoxy primer comprises independently packaged paint and a curing agent;
the paint comprises the following components in percentage by mass: 29-35% of E-20 bisphenol A epoxy resin, 3-7% of E-44 bisphenol A epoxy resin, 5-15% of anti-rust pigment, 30-50% of pigment filler, 2-19% of organic solvent, 2-6% of active diluent, 1.1-1.7% of rheological agent, 0.5-1.0% of accelerator, 0.4-0.8% of defoaming agent and 0.2-0.5% of dispersing agent;
the curing agent comprises the following components in percentage by mass: 60-90% of polyamide resin and 10-40% of organic solvent;
the mass ratio of the paint to the curing agent is (4-8): 1.
2. the flow-coated epoxy primer according to claim 1, wherein the E-20 bisphenol A epoxy resin has a solid content of 58-62%.
3. The flow-coated epoxy primer according to claim 1, wherein the E-44 bisphenol A epoxy resin has a solid content of 99% or more.
4. The flow-coated epoxy primer according to claim 1, wherein the rust inhibitive pigment is one or two of zinc phosphate, zinc complex phosphate, zinc molybdate hydrate, calcium aluminum complex phosphate, calcium aluminum silicate hydrate polyphosphate.
5. The flow-coated epoxy primer according to claim 1, wherein the pigment and filler is 3-6 of anatase titanium dioxide, red iron oxide, yellow iron oxide, high-pigment carbon black, sericite, talcum powder, calcium carbonate, silicon micropowder and barium sulfate.
6. The flow-coated epoxy primer according to claim 1, wherein the organic solvent in the vehicle and the curing agent is independently two or more of xylene, n-butanol, isopropanol, and cyclohexanone.
7. The flow coated epoxy primer according to claim 1, wherein the reactive diluent is one or more of C12-C14 alcohol glycidyl ethers.
8. The flow coated epoxy primer of claim 1, wherein the rheological agent comprises a polyamidocarboxylate ionic dispersant and a modified hydrogenated castor oil.
9. A method for preparing the flow-coating epoxy primer according to any one of claims 1 to 8, comprising the following steps:
(1) mixing E-20 bisphenol A epoxy resin, E-44 bisphenol A epoxy resin and a rheological agent for activation to obtain an activated material;
(2) mixing the activated material obtained in the step (1) with an anti-rust pigment, a pigment filler, an organic solvent, an active diluent, a dispersing agent, a defoaming agent and an accelerator to obtain a premixed paint;
(3) sanding the premixed paint obtained in the step (2) to obtain the paint;
(4) mixing polyamide resin and an organic solvent to obtain a curing agent;
the step (1) and the step (4) are not in sequence.
10. The application of the flow-coating epoxy primer according to any one of claims 1 to 8 or the flow-coating epoxy primer prepared by the preparation method according to claim 9 in a metal packaging container is to mix the paint and the curing agent, and then add an organic solvent to adjust the viscosity to 20 to 40S for flow coating.
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