CN107502163B - Primer-topcoat cathode electrophoretic coating and preparation method thereof - Google Patents
Primer-topcoat cathode electrophoretic coating and preparation method thereof Download PDFInfo
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- 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
- C08G81/00—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers
- C08G81/02—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers at least one of the polymers being obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C08G81/024—Block or graft polymers containing sequences of polymers of C08C or C08F and of polymers of C08G
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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
- C09D5/44—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications
- C09D5/4419—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications with polymers obtained otherwise than by polymerisation reactions only involving carbon-to-carbon unsaturated bonds
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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
- C09D5/44—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications
- C09D5/4488—Cathodic paints
- C09D5/4492—Cathodic paints containing special additives, e.g. grinding agents
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Abstract
The invention relates to a preparation method of a primer-topcoat cathode electrophoretic coating, which is characterized by comprising the following steps: comprises the following steps of preparing cationic acrylic resin; preparing cationic epoxy resin; carrying out grafting reaction on cationic acrylic resin and cationic epoxy resin to obtain acrylic-epoxy resin; preparing a totally-enclosed curing agent; mixing the prepared acrylic acid-epoxy resin with a totally-enclosed curing agent to obtain emulsion; adding the prepared cationic epoxy resin into a filler and a pigment to prepare color paste; the prepared emulsion and the prepared color paste are prepared according to the proportion to obtain the primer-topcoat cathode electrophoretic coating. The invention also relates to a primer-topcoat cathode electrophoretic coating. The invention synthesizes the acrylate resin with the epoxy group by using the acrylic monomer containing the epoxy group, and solves the problems of emulsion delamination and acrylate resin hydrolytic gelation.
Description
Technical Field
The invention belongs to the technical field of cathode electrophoretic coatings, and particularly relates to a primer-topcoat cathode electrophoretic coating and a preparation method thereof.
Background
The cathodic electrophoretic coating generally uses epoxy resin with good corrosion resistance as a main body, the epoxy resin is generally bisphenol A type, and the epoxy resin is commonly used as a primer and an anticorrosive paint due to high adhesive force and excellent anticorrosive performance. Although it is excellent in corrosion resistance, it is not good enough in weather resistance. The acrylate resin has wide application because of excellent weather resistance, good color and gloss retention and abundant monomer sources. The primer-topcoat cathode electrophoretic paint has the advantages that the primer-topcoat cathode electrophoretic paint has the corrosion resistance of a primer and also has certain aging performance of a topcoat, so that the requirements of coating optimization process and cost saving are met, and the primer-topcoat cathode electrophoretic paint is suitable for coating automobile chassis, parts, lamp decorations, hardware and the like.
The prior synthesis technology of the primer-topcoat cathode electrophoretic coating is to compound two emulsions (or resins) in a cold splicing mode after separately synthesizing an epoxy emulsion (or resin) and an acrylic emulsion (or resin) to obtain the primer-topcoat cathode electrophoretic coating. The cold-spliced emulsion with the bottom surface has the problem of poor stability. One is the problem that emulsion delamination easily occurs, and the other is the phenomenon that acrylic resin hydrolyzes, the viscosity of the emulsion increases and the emulsion gels.
Disclosure of Invention
Technical problem to be solved
In order to solve the above problems, the present invention provides a method for preparing a primer-topcoat cathode electrophoretic coating, which solves the problems of emulsion delamination and acrylate resin hydrolytic gelation.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a preparation method of a primer-topcoat cathode electrophoretic coating comprises the following steps,
preparing cationic acrylic resin;
preparing cationic epoxy resin;
carrying out grafting reaction on cationic acrylic resin and cationic epoxy resin to obtain acrylic-epoxy resin;
preparing a totally-enclosed curing agent;
mixing the prepared acrylic acid-epoxy resin with a totally-enclosed curing agent to obtain emulsion;
taking cationic epoxy resin, adding a filler and a pigment to prepare color paste;
the emulsion and the color paste are prepared according to the proportion to obtain the primer-topcoat cathode electrophoretic coating.
Further, the preparation of the cationic acrylic resin comprises the following steps:
adding 2-5 parts by weight of initiator into 180 parts by weight of solvent of 150-one, stirring and heating to 75-85 ℃, then beginning to dropwise add 60-80 parts by weight of styrene, 70-110 parts by weight of methacrylic acid monomer, 40-60 parts by weight of methacrylic acid monomer mixed solution containing epoxy functional groups and initiator solution, wherein the dropwise adding time is 2-4h, the temperature is kept at 75-85 ℃, the temperature is kept for 1-3h after the dropwise adding is finished, 0.5-1 part by weight of initiator is supplemented, and the temperature is kept for 2-3h continuously to prepare the acrylate resin with epoxy functional groups;
and adding 30-40 parts by weight of amine into the acrylic resin with the epoxy functional group to open the ring of the epoxy group part to obtain the cationic acrylic resin.
Further, the solvent is propylene glycol methyl ether, ethylene glycol ethyl ether or isopropanol;
the initiator is azobisisobutyronitrile;
the methacrylic acid monomer is 2-ethyl methacrylate and hydroxypropyl methacrylate;
the acrylic monomer containing the epoxy functional group is glycidyl methacrylate.
Further, the amine is ketimine, and the ring opening rate of the ring opening of the epoxy group part is 50-60%.
Further, the preparation of the cationic epoxy resin comprises the following steps:
adding a mixture of 130-40 parts by weight of low-molecular-weight epoxy resin, 30-40 parts by weight of alkylphenol, 30-40 parts by weight of solvent, 0.3-0.5 part by weight of catalyst and 30-40 parts by weight of bisphenol A, stirring and heating, heating to 150-180 ℃, preserving heat for 2-3h, adding 30-40 parts by weight of solvent, and preparing the epoxy resin with medium molecular weight by chain extension;
and adding 20-25 parts by weight of amine into the epoxy resin with the medium molecular weight to open the ring of partial epoxy functional groups to obtain the cationic epoxy resin.
Further, the low molecular epoxy resin is an epoxy resin with an epoxy value of 0.4-0.55;
the alkylphenol is dodecylphenol;
the catalyst is an ammonia catalyst;
the solvent is phenylate and/or alcohol ether solvent.
Further, the amine is diethanolamine or N, N-dimethylethanolamine, and the ring opening rate of the ring opening of the epoxy group part is 60-65%.
Further, taking cationic acrylic resin and cationic epoxy resin with the molar ratio of 1:1, stirring and heating, and adding micromolecular polyamine to obtain acrylic-epoxy resin with one end having an acrylate structure and the other end having an epoxy structure;
the molar ratio of the small-molecular polyamine to the cationic acrylic resin is 1: 1;
the micromolecular polyamine is ethylenediamine.
Further, the preparation method of the totally-enclosed curing agent comprises the following steps: taking 50-60 parts by weight of isocyanate, 20-30 parts by weight of methyl ethyl ketone and 0.1 part by weight of catalyst, stirring and heating, heating to 70-80 ℃, dropwise adding 50-60 parts by weight of diethylene glycol ethyl ether, after dropwise adding is finished for 1-2h, controlling the temperature in the dropwise adding process to be 70-80 ℃, and after dropwise adding is finished, keeping the temperature at 70-80 ℃ for 2h to prepare a totally-closed isocyanate curing agent;
the preparation method of the emulsion comprises the following steps: taking 150-300 parts by weight of acrylic acid-epoxy resin and 75-140 parts by weight of totally-enclosed isocyanate curing agent, adding 7-8 parts by weight of polypropylene glycol ether 2000, 40-50 parts by weight of organic acid, 300-350 parts by weight of water and 3-4 parts by weight of auxiliary agent, uniformly stirring, and dispersing at high speed to obtain emulsion;
the preparation method of the color paste comprises the following steps: adding 300 parts by weight of 250-50 parts by weight of cationic epoxy resin, 40-50 parts by weight of solvent, 50-60 parts by weight of organic acid, 180 parts by weight of 150-180 parts by weight of kaolin, 50-55 parts by weight of carbon black, 10-15 parts by weight of drier, 7-9 parts by weight of emulsifier and 500 parts by weight of 400-one water, dispersing at high speed, and grinding by using a sand mill to prepare black paste;
the preparation method of the primer-topcoat cathode electrophoretic coating comprises the following steps: the weight portions are as follows: emulsion: color paste: water 5: 1: and 6, preparing the electrophoretic paint.
According to another aspect of the present invention, a primer-topcoat cathode electrophoretic coating is prepared by the above method.
(III) advantageous effects
According to the invention, the acrylic resin with the epoxy group is synthesized by using the acrylic monomer containing the epoxy group, and the acrylic resin with the epoxy group and the epoxy resin with the epoxy group are linked through polyamine to synthesize the main resin with the acrylic ester structure at one end and the epoxy structure at the other end, so that the problems of emulsion layering and acrylic ester resin hydrolytic gelation are solved.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Glycidyl Methacrylate (GMA) is an acrylate monomer with oxygen-containing functional groups, and can be subjected to polymerization reaction with the acrylate monomer and ring-opening reaction with active hydrogen substances. The acrylate copolymer is polymerized with acrylate monomer, mixed with epoxy resin and added with polyamine for grafting reaction.
In the synthesis process of the cationic epoxy resin, the ring-opening rate of the epoxy resin is controlled to be higher than 60%, and the problem that the coke pot is caused by infinite chain extension in the grafting reaction of the cationic epoxy resin and the cationic acrylic resin is avoided.
The epoxy value of epoxy of the low molecular epoxy resin is 0.4-0.55, and the small molecular epoxy resin is selected to facilitate subsequent ring opening and chain extension and grafting of new functional groups.
The filler can be kaolin, titanium dioxide and the like, and is suitable for the technical scheme of the invention as long as the filler can be used for the filler in the aspect of paint.
Example 1
Preparing cationic acrylic resin:
adding 2 parts by weight of azobisisobutyronitrile into 155 parts by weight of propylene glycol methyl ether or ethylene glycol ethyl ether, stirring and heating to 75-85 ℃, then beginning to dropwise add a mixed solution of 65 parts by weight of styrene, 65 parts by weight of 2-ethyl methacrylate, 33 parts by weight of hydroxypropyl methacrylate and 43 parts by weight of glycidyl methacrylate and an initiator solution for 2 hours, keeping the temperature at 75-85 ℃, keeping the temperature for 1 hour after dropwise addition, supplementing 0.5 part by weight of azobisisobutyronitrile, and continuing to keep the temperature for 2 hours to prepare the acrylate resin with the epoxy functional group;
to an acrylic resin having an epoxy functional group, 37 parts by weight of ketimine was added to make the epoxy group ring-opening ratio 60%, to obtain a cationic acrylic resin.
Preparing a cationic epoxy resin:
adding 142 parts by weight of E44 epoxy resin, 32 parts by weight of dodecylphenol, 32 parts by weight of propylene glycol methyl ether, 0.3 part by weight of ammonia catalyst and 35 parts by weight of bisphenol A into a reactor, stirring and heating the mixture, heating to 150 ℃ and 180 ℃, preserving the heat for 2 hours, adding 20 parts by weight of phenyl ether and 18 parts by weight of alcohol ether, and preparing the epoxy resin with medium molecular weight by chain extension;
adding 25 parts by weight of N, N-dimethylethanolamine into the epoxy resin with medium molecular weight to ensure that the ring opening rate of the epoxy functional group is 65 percent, thus obtaining the cationic epoxy resin.
Taking cationic acrylic resin and cationic epoxy resin with the molar ratio of 1:1, stirring and heating, adding ethylenediamine with the same molar weight as the cationic acrylic resin, and carrying out grafting reaction to obtain acrylic-epoxy resin with an acrylate structure at one end and an epoxy structure at the other end;
taking 57 parts by weight of isocyanate, 26 parts by weight of methyl ethyl ketone and 0.1 part by weight of catalyst, stirring and heating, heating to 70-80 ℃, dropwise adding 54 parts by weight of diethylene glycol ethyl ether, controlling the temperature of 70-80 ℃ in the dropwise adding process after 1 hour of dropwise adding is finished, and keeping the temperature at 70-80 ℃ for 2 hours after the dropwise adding is finished to prepare a totally-enclosed isocyanate curing agent;
taking 150 parts by weight of acrylic acid-epoxy resin and 75 parts by weight of totally-enclosed isocyanate curing agent, adding 7 parts by weight of polypropylene glycol ether 2000, 40 parts by weight of acetic acid, 300 parts by weight of water and 3 parts by weight of auxiliary agent, uniformly stirring, and dispersing at high speed to obtain emulsion;
taking 270 parts by weight of cationic epoxy resin, adding 45 parts by weight of solvent, 51 parts by weight of organic acid, 152 parts by weight of kaolin, 51 parts by weight of carbon black, 10 parts by weight of drier, 7 parts by weight of emulsifier and 420 parts by weight of water, dispersing at high speed, and grinding by using a sand mill to prepare black paste;
the weight portions are as follows: emulsion: color paste: water 5: 1: 6 preparing electrophoretic paint to obtain the bottom-surface-in-one cathode electrophoretic paint.
And (3) carrying out electrophoresis on the obtained primer-topcoat cathode electrophoretic coating for 60S under the voltage of 200V to obtain a coating film with the following properties:
coating thickness: 20 μm
Pencil hardness: 2H
Impact strength: 50cm
Adhesion force: level 0
Salt spray resistance (neutral): 500h
Weather resistance: 500h, the light loss rate is less than or equal to 30 percent, and the paint does not chalk, foam and obviously discolor.
Example 2
Preparing cationic acrylic resin:
adding 3.5 parts by weight of azobisisobutyronitrile into 175 parts by weight of isopropanol, stirring and heating to 75-85 ℃, then beginning to dropwise add a mixed solution of 75 parts by weight of styrene, 70 parts by weight of 2-ethyl methacrylate, 38 parts by weight of hydroxypropyl methacrylate and 58 parts by weight of glycidyl methacrylate and an initiator solution for 4 hours, keeping the temperature at 75-85 ℃, keeping the temperature for 3 hours after dropwise addition, supplementing 1 part by weight of azobisisobutyronitrile, and continuing to keep the temperature for 3 hours to prepare the acrylate resin with the epoxy functional group;
amine 30 parts by weight of ketimine was added to an acrylate resin having an epoxy functional group to make the epoxy group ring-opening ratio 50%, to obtain a cationic acrylic resin.
Preparing a cationic epoxy resin:
adding 150 parts by weight of E51 epoxy resin, 40 parts by weight of dodecylphenol, 40 parts by weight of propylene glycol methyl ether, 0.5 part by weight of ammonia catalyst and 40 parts by weight of bisphenol A into a reactor, stirring and heating the mixture, heating to 150 ℃ and 180 ℃, preserving heat for 3 hours, adding 20 parts by weight of phenyl ether and 18 parts by weight of alcohol ether, and preparing epoxy resin with medium molecular weight by chain extension;
and adding 20 parts by weight of diethanolamine into the epoxy resin with medium molecular weight to ensure that the ring opening rate of the epoxy functional group is 60 percent, thereby obtaining the cationic epoxy resin.
Taking cationic acrylic resin and cationic epoxy resin with the molar ratio of 1:1, stirring and heating, adding ethylenediamine with the same molar weight as the cationic acrylic resin, and carrying out grafting reaction to obtain acrylic-epoxy resin with an acrylate structure at one end and an epoxy structure at the other end;
taking 51 parts by weight of isocyanate, 28 parts by weight of methyl ethyl ketone and 0.1 part by weight of catalyst, stirring and heating, heating to 70-80 ℃, dropwise adding 58 parts by weight of diethylene glycol ethyl ether, controlling the temperature of 70-80 ℃ in the dropwise adding process after finishing dropwise adding for 2h, and keeping the temperature at 70-80 ℃ for 2h to prepare a totally-closed isocyanate curing agent;
taking 280 parts by weight of acrylic acid-epoxy resin and 140 parts by weight of totally-closed isocyanate curing agent, adding 8 parts by weight of polypropylene glycol ether 2000, 50 parts by weight of lactic acid, 350 parts by weight of water and 4 parts by weight of auxiliary agent, uniformly stirring, and dispersing at high speed to obtain emulsion;
taking 300 parts by weight of cationic epoxy resin, adding 50 parts by weight of solvent, 60 parts by weight of organic acid, 180 parts by weight of kaolin, 54 parts by weight of carbon black, 14 parts by weight of drier, 9 parts by weight of emulsifier and 500 parts by weight of water, dispersing at high speed, and grinding by using a sand mill to prepare black paste;
the weight portions are as follows: emulsion: color paste: water 5: 1: 6 preparing electrophoretic paint to obtain the bottom-surface-in-one cathode electrophoretic paint.
And (3) carrying out electrophoresis on the obtained primer-topcoat cathode electrophoretic coating for 60S under the voltage of 200V to obtain a coating film with the following properties:
coating thickness: 20 μm
Pencil hardness: 2H
Impact strength: 50cm
Adhesion force: level 0
Salt spray resistance (neutral): 500h
Weather resistance: 500h, the light loss rate is less than or equal to 30 percent, and the paint does not chalk, foam and obviously discolor.
It should be noted that: the invention is not limited to preparing black primer-cathode electrophoretic paint, and different pigments can be used to prepare paints with different colors.
The technical principles of the present invention have been described above in connection with specific embodiments, which are intended to explain the principles of the present invention and should not be construed as limiting the scope of the present invention in any way. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive efforts, which shall fall within the scope of the present invention.
Claims (9)
1. A preparation method of a primer-topcoat cathode electrophoretic coating is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
preparing cationic acrylic resin;
preparing cationic epoxy resin;
carrying out grafting reaction on the cationic acrylic resin and the cationic epoxy resin to obtain acrylic acid-epoxy resin; taking cationic acrylic resin and cationic epoxy resin with the molar ratio of 1:1, stirring and heating, and adding micromolecular polyamine to obtain acrylic-epoxy resin with an acrylate structure at one end and an epoxy structure at the other end;
preparing a totally-enclosed curing agent;
mixing the acrylic acid-epoxy resin and a totally-enclosed curing agent to obtain emulsion;
taking the cationic epoxy resin, adding a filler and a pigment to prepare color paste;
preparing the emulsion and the color paste according to a proportion to obtain a primer-topcoat cathode electrophoretic coating;
the preparation of the cationic acrylic resin comprises the following steps:
adding 2-5 parts by weight of initiator into 180 parts by weight of solvent of 150-one, stirring and heating to 75-85 ℃, then beginning to dropwise add 60-80 parts by weight of styrene, 70-110 parts by weight of methacrylate monomer, 40-60 parts by weight of methacrylate monomer mixed solution containing epoxy functional groups and initiator solution, wherein the dropwise adding time is 2-4h, the temperature is kept at 75-85 ℃, the temperature is kept for 1-3h after the dropwise adding is finished, 0.5-1 part by weight of initiator is supplemented, and the temperature is kept for 2-3h continuously to prepare the acrylate resin with epoxy functional groups;
adding 30-40 parts by weight of amine into the acrylate resin with the epoxy functional group to open the ring of the epoxy group part to obtain cationic acrylic resin;
the methacrylate monomer is 2-ethyl methacrylate and hydroxypropyl methacrylate; the methacrylate monomer containing the epoxy functional group is glycidyl methacrylate.
2. The method for preparing a primer-topcoat cathode electrophoretic coating according to claim 1, wherein the primer-topcoat cathode electrophoretic coating comprises:
adding 2-5 parts by weight of initiator into 180 parts by weight of 150-one solvent, wherein the solvent is propylene glycol methyl ether, ethylene glycol ethyl ether or isopropanol; the initiator is azobisisobutyronitrile.
3. The method for preparing a primer-topcoat cathode electrophoretic coating according to claim 1, wherein the primer-topcoat cathode electrophoretic coating comprises:
30-40 parts by weight of amine is added into acrylate resin with epoxy functional groups to separate epoxy groups from rings, wherein the amine is ketimine, and the ring opening rate of the ring opening of the epoxy groups is 50-60%.
4. The method for preparing a primer-topcoat cathode electrophoretic coating according to claim 1, wherein the primer-topcoat cathode electrophoretic coating comprises: the preparation of the cationic epoxy resin comprises the following steps:
adding a mixture of 130-40 parts by weight of low-molecular-weight epoxy resin, 30-40 parts by weight of alkylphenol, 30-40 parts by weight of solvent, 0.3-0.5 part by weight of catalyst and 30-40 parts by weight of bisphenol A, stirring and heating, heating to 150-180 ℃, preserving heat for 2-3h, adding 30-40 parts by weight of solvent, and preparing the epoxy resin with medium molecular weight by chain extension;
and adding 20-25 parts by weight of amine into the epoxy resin with the medium molecular weight to open the ring of partial epoxy functional groups to obtain the cationic epoxy resin.
5. The method for preparing a primer-topcoat cathode electrophoretic paint according to claim 4, wherein the primer-topcoat cathode electrophoretic paint comprises:
the low molecular epoxy resin is an epoxy resin with an epoxy value of 0.4-0.55;
the alkylphenol is dodecylphenol;
the catalyst is an ammonia catalyst;
heating to 150 ℃ and keeping the temperature for 2-3h, and adding the mixture into 30-40 parts by weight of solvent, wherein the solvent is phenylate and alcohol ether solvent.
6. The method for preparing a primer-topcoat cathode electrophoretic paint according to claim 4, wherein the primer-topcoat cathode electrophoretic paint comprises:
20-25 parts by weight of amine is added into the epoxy resin with medium molecular weight to open a ring of partial epoxy functional groups, the amine is diethanolamine or N, N-dimethylethanolamine, and the ring opening rate of the partial ring opening of the epoxy groups is 60-65%.
7. The method for preparing a primer-topcoat cathode electrophoretic coating according to claim 1, wherein the primer-topcoat cathode electrophoretic coating comprises:
the molar ratio of the small-molecular polyamine to the cationic acrylic resin is 1: 1;
the micromolecular polyamine is ethylenediamine.
8. The method for preparing a primer-topcoat cathode electrophoretic coating according to claim 1, wherein the primer-topcoat cathode electrophoretic coating comprises:
the preparation method of the totally-enclosed curing agent comprises the following steps: taking 50-60 parts by weight of isocyanate, 20-30 parts by weight of methyl ethyl ketone and 0.1 part by weight of catalyst, stirring and heating, heating to 70-80 ℃, dropwise adding 50-60 parts by weight of diethylene glycol ethyl ether, after dropwise adding is finished for 1-2h, controlling the temperature in the dropwise adding process to be 70-80 ℃, and after dropwise adding is finished, keeping the temperature at 70-80 ℃ for 2h to prepare a totally-closed isocyanate curing agent;
the preparation method of the emulsion comprises the following steps: taking 150-300 parts by weight of acrylic acid-epoxy resin and 75-140 parts by weight of totally-enclosed isocyanate curing agent, adding 7-8 parts by weight of polypropylene glycol ether 2000, 40-50 parts by weight of organic acid, 300-350 parts by weight of water and 3-4 parts by weight of auxiliary agent, uniformly stirring, and dispersing at high speed to obtain emulsion;
the preparation method of the color paste comprises the following steps: adding 300 parts by weight of 250-50 parts by weight of cationic epoxy resin, 40-50 parts by weight of solvent, 50-60 parts by weight of organic acid, 180 parts by weight of 150-180 parts by weight of kaolin, 50-55 parts by weight of carbon black, 10-15 parts by weight of drier, 7-9 parts by weight of emulsifier and 500 parts by weight of 400-one water, dispersing at high speed, and grinding by using a sand mill to prepare black paste;
the preparation method of the primer-topcoat cathode electrophoretic coating comprises the following steps: the weight portions are as follows: emulsion: color paste: water 5: 1: and 6, preparing the electrophoretic paint.
9. The primer-topcoat cathode electrophoretic coating is characterized in that: the primer-topcoat cathode electrocoat prepared by the method of any one of claims 1 to 8.
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| CN108795212B (en) * | 2018-05-30 | 2020-07-21 | 浙江铭孚金属涂装科技有限公司 | Preparation method of weather-resistant and corrosion-resistant two-in-one cathode electrophoretic coating |
| CN109111563B (en) * | 2018-07-19 | 2021-06-15 | 浩力森化学科技（江苏）有限公司 | Pigment dispersion resin for primer-topcoat cathode electrophoretic coating and preparation method thereof |
| CN109294314B (en) * | 2018-09-06 | 2020-10-16 | 中国海洋石油集团有限公司 | Epoxy acrylic acid cathodic electrophoretic coating resin emulsion and preparation method thereof |
| CN109679453A (en) * | 2018-12-28 | 2019-04-26 | 尚志造漆(昆山)有限公司 | A kind of preparation method of water-dispersion type cathode epoxy electrophoretic coating |
| CN110903690B (en) * | 2019-11-26 | 2021-08-24 | 深圳市长丰环保新材料有限公司 | Cathode electrophoretic coating and preparation method thereof |
| CN112409878A (en) * | 2020-12-01 | 2021-02-26 | 武汉双虎涂料有限公司 | Primer-topcoat integrated electrophoretic paint and preparation method thereof |
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| CN100582173C (en) * | 2007-07-27 | 2010-01-20 | 湖南工程学院 | Method for preparing bottom surface unification cathode electrophoresis dope |
| JP2013203966A (en) * | 2012-03-29 | 2013-10-07 | Kansai Paint Co Ltd | Cathodic electrodeposition coating composition |
| CN103333595B (en) * | 2013-06-09 | 2016-07-27 | 广东科德环保科技股份有限公司 | A kind of bottom surface unification cathode electrophoresis dope and preparation method thereof and using method |
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