CN115286981B - Epoxy polyester thermosetting powder coating and preparation method thereof - Google Patents

Epoxy polyester thermosetting powder coating and preparation method thereof Download PDF

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CN115286981B
CN115286981B CN202210955375.8A CN202210955375A CN115286981B CN 115286981 B CN115286981 B CN 115286981B CN 202210955375 A CN202210955375 A CN 202210955375A CN 115286981 B CN115286981 B CN 115286981B
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CN115286981A (en
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区宇
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Zhaoqing Amega Technology Co ltd
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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
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/47—Levelling agents
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/63—Additives non-macromolecular organic
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

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Abstract

The application is applicable to the technical field of coatings, and provides an epoxy polyester thermosetting powder coating and a preparation method thereof, wherein the epoxy polyester thermosetting powder coating comprises the following raw materials in parts by weight: 40-55 parts of polyester resin, 6-15 parts of epoxy resin, 3.5-4.6 parts of triglycidyl isocyanurate, 3.6-9 parts of methyl hexahydrophthalic anhydride, 5-15 parts of precipitated barium sulfate, 18-25 parts of rutile type titanium dioxide, 0.8-1.2 parts of flatting agent and 0.3-0.6 part of benzoin; the epoxy resin is one or two of hydrogenated bisphenol A epoxy resin and alicyclic modified bisphenol A epoxy acrylic resin. The application not only enhances the solvent resistance of the coating, but also takes the overall comprehensive performance of the coating into consideration, and is an ideal product capable of replacing pure polyester powder coating.

Description

Epoxy polyester thermosetting powder coating and preparation method thereof
Technical Field
The application belongs to the technical field of coatings, and particularly relates to an epoxy polyester thermosetting powder coating and a preparation method thereof.
Background
The powder coating such as polyester powder coating has the advantages of no pollution, energy saving, high mechanical strength of coating film and the like, and is widely applied to the product coating in the fields of household appliances, office furniture, automobile parts, transportation facilities, electrical equipment, building materials and the like.
However, the pure polyester weather-resistant powder coating product on the market at present has the problem of serious light loss and color change after being sprayed, baked and film-formed and wiped by a strong solvent resistance.
Disclosure of Invention
The embodiment of the application aims to provide an epoxy polyester thermosetting powder coating, and aims to solve the problem that the existing pure polyester weather-resistant powder coating product is extremely serious in light loss and color change after being sprayed, baked and film-formed and wiped by a strong solvent resistance.
The embodiment of the application is realized in such a way that the epoxy polyester thermosetting powder coating comprises the following raw materials in parts by weight:
40-55 parts of polyester resin, 6-15 parts of epoxy resin, 3.5-4.6 parts of triglycidyl isocyanurate, 3.6-9 parts of methyl hexahydrophthalic anhydride, 5-15 parts of precipitated barium sulfate, 18-25 parts of rutile type titanium dioxide, 0.8-1.2 parts of flatting agent and 0.3-0.6 part of benzoin;
the epoxy resin is one or two of hydrogenated bisphenol A epoxy resin and alicyclic modified bisphenol A epoxy acrylic resin.
Another object of an embodiment of the present application is a method for preparing an epoxy polyester thermosetting powder coating, comprising:
weighing all raw materials according to the formula of the epoxy polyester thermosetting powder coating for standby;
fully stirring and mixing polyester resin, epoxy resin, triglycidyl isocyanurate, methyl hexahydrophthalic anhydride, precipitated barium sulfate, rutile type titanium white, a leveling agent and benzoin, melting and extruding, cooling, tabletting and crushing to obtain the modified polyester resin.
The epoxy polyester thermosetting powder coating provided by the embodiment of the application is obtained by adding hydrogenated bisphenol A epoxy resin and/or alicyclic modified bisphenol A epoxy acrylic resin into polyester resin and compounding other auxiliary materials such as methyl hexahydrophthalic anhydride, precipitated barium sulfate, rutile type titanium dioxide, flatting agent and benzoin, so that the solvent resistance of the coating is enhanced, the overall comprehensive performance of the coating is considered, and the epoxy polyester thermosetting powder coating is an ideal product capable of replacing pure polyester powder coating.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
In order to solve the problem that the existing pure polyester weather-resistant powder coating product is extremely serious in light-losing and color-changing phenomena after being sprayed, baked and film-formed and wiped by a strong solvent resistance, the embodiment of the application provides the epoxy polyester thermosetting powder coating, which is obtained by adding hydrogenated bisphenol A epoxy resin and/or alicyclic modified bisphenol A epoxy acrylic resin into polyester resin and compounding other auxiliary materials such as methyl hexahydrophthalic anhydride, precipitated barium sulfate, rutile type titanium dioxide, a leveling agent and benzoin, so that the solvent resistance of the coating is enhanced, the overall comprehensive performance of the coating is considered, and the epoxy polyester thermosetting powder coating is an ideal product capable of replacing pure polyester powder coating.
In the embodiment of the application, the epoxy polyester thermosetting powder coating comprises the following raw materials in parts by weight:
40-55 parts of polyester resin, 6-15 parts of epoxy resin, 3.5-4.6 parts of triglycidyl isocyanurate, 3.6-9 parts of methyl hexahydrophthalic anhydride, 5-15 parts of precipitated barium sulfate, 18-25 parts of rutile type titanium dioxide, 0.8-1.2 parts of flatting agent and 0.3-0.6 part of benzoin.
Wherein the epoxy resin is one or two of hydrogenated bisphenol A epoxy resin and alicyclic modified bisphenol A epoxy acrylic resin; the hydrogenated bisphenol A epoxy resin is purchased from complex new materials (Shanghai) limited and is selected from hydrogenated bisphenol A epoxy resin HE-5100; the alicyclic modified bisphenol A epoxy acrylic resin can be prepared by a conventional method, for example, all the embodiments of the application are formed by utilizing the reaction of alicyclic epoxy resin and acrylic ester under the catalysis of tetramethyl ammonium chloride.
In a preferred embodiment of the present application, the epoxy resin is prepared from the following components in mass ratio of 1: the hydrogenated bisphenol A epoxy resin and the alicyclic modified bisphenol A epoxy acrylic resin of (1-3); more preferably, when the epoxy resin is prepared from the following components in a mass ratio of 1:2 and the alicyclic modified bisphenol A epoxy acrylic resin, the solvent resistance of the corresponding paint is optimal.
In a preferred embodiment of the present application, a large number of proportioning tests result in a formulation with a more ideal proportioning: 48 parts of polyester resin, 10 parts of epoxy resin, 4 parts of triglycidyl isocyanurate, 6 parts of methyl hexahydrophthalic anhydride, 7.5 parts of precipitated barium sulfate, 20 parts of rutile type titanium dioxide, 1 part of flatting agent and 0.5 part of benzoin.
In the embodiment of the present application, the leveling agent may be a leveling agent commonly used in the art, such as EFKA3777, M88, and the like.
Since the existing pure polyester weather-resistant powder coating has to be improved in rust-preventing effect when applied to metal products, in another preferred embodiment of the present application, the epoxy polyester thermosetting powder coating further comprises 0.2 to 0.6 part of rust-preventing powder and 0.03 to 0.05 part of film forming agent.
Wherein the rust-preventive powder is prepared from carboxylate resinIs obtained by reaction with ethanolamine, specifically, 10 percent hexazine compound solvent is added into a reaction kettle, 10 percent carboxylate resin is added under stirring, and N is introduced 2 Protecting and heating to 120 ℃ and then reacting for 1h, adding excessive ethanolamine under stirring, reducing the temperature to 80 ℃ and reacting for 2h, cooling to room temperature after the reaction is completed, and cooling and crystallizing the resultant liquid to obtain the antirust powder.
The film forming agent is prepared by reacting tetrabutyl titanate with alcohol amine, specifically, 40% distilled water is taken, the pH value of the solution is adjusted to 5 by using acetic acid, 40% gamma- (2, 3-glycidoxy) propyl trimethoxy silane and 10% tetrabutyl titanate are added, the solution is stirred and hydrolyzed at 55 ℃ until the solution is uniform and stable, 10% alcohol amine is added, the solution is stirred and reacted for about 1.5 hours, and the film forming agent is obtained after cooling.
The percentages are mass percentages.
The embodiment of the application also provides a preparation method of the epoxy polyester thermosetting powder coating, which comprises the following steps:
weighing all raw materials according to the formula of the epoxy polyester thermosetting powder coating for standby;
fully stirring and mixing polyester resin, epoxy resin, triglycidyl isocyanurate, methyl hexahydrophthalic anhydride, precipitated barium sulfate, rutile type titanium white, a leveling agent and benzoin, melting and extruding, cooling, tabletting and crushing to obtain the modified polyester resin.
In the embodiment of the application, the steps of fully stirring and mixing polyester resin, epoxy resin, triglycidyl isocyanurate, methyl hexahydrophthalic anhydride, precipitated barium sulfate, rutile type titanium white, a leveling agent and benzoin, carrying out melt extrusion, cooling, tabletting and crushing, and obtaining the product comprise the following steps:
fully stirring and mixing polyester resin, epoxy resin, triglycidyl isocyanurate, methyl hexahydrophthalic anhydride, precipitated barium sulfate, rutile type titanium white, a leveling agent, benzoin, antirust powder and a film forming agent, and carrying out melt extrusion, cooling, tabletting and crushing to obtain the modified polyester resin.
Examples of certain embodiments of the present application are given below, which are not intended to limit the scope of the present application.
In addition, it should be noted that the numerical values set forth in the following examples are as precise as possible, but those skilled in the art will understand that each numerical value should be construed as a divisor rather than an absolute precise numerical value due to measurement errors and experimental operation problems that cannot be avoided.
Example 1
Weighing raw materials according to a formula of 47.5 parts of polyester resin (4 ET), 10 parts of epoxy resin (alicyclic modified bisphenol A epoxy acrylic resin), 4.2 parts of triglycidyl isocyanurate, 6.5 parts of methyl hexahydrophthalic anhydride, 7.5 parts of precipitated barium sulfate (Fuping), 21.5 parts of rutile titanium dioxide (R969), 1.2 parts of flatting agent (M88) and 0.6 part of benzoin (SY 702) for later use;
and fully stirring and mixing the polyester resin, the epoxy resin, the triglycidyl isocyanurate, the methyl hexahydrophthalic anhydride, the precipitated barium sulfate, the rutile type titanium pigment, the flatting agent and the benzoin, and carrying out melt extrusion, cooling, tabletting and crushing to obtain the epoxy polyester thermosetting powder coating.
Example 2
Weighing raw materials according to a formula of 48.5 parts of polyester resin (4 ET), 10.5 parts of epoxy resin (hydrogenated bisphenol A epoxy resin), 4 parts of triglycidyl isocyanurate, 6 parts of methyl hexahydrophthalic anhydride, 6.8 parts of precipitated barium sulfate (Fuping), 19.5 parts of rutile titanium dioxide (R969), 0.9 part of flatting agent (M88) and 0.3 part of benzoin (SY 702) for later use;
and fully stirring and mixing the polyester resin, the epoxy resin, the triglycidyl isocyanurate, the methyl hexahydrophthalic anhydride, the precipitated barium sulfate, the rutile type titanium pigment, the flatting agent and the benzoin, and carrying out melt extrusion, cooling, tabletting and crushing to obtain the epoxy polyester thermosetting powder coating.
Example 3
Weighing all raw materials for standby according to a formula of 48 parts of polyester resin (4 ET), 10 parts of epoxy resin (consisting of hydrogenated bisphenol A epoxy resin and alicyclic modified bisphenol A epoxy acrylic resin with the mass ratio of 1:1), 4 parts of triglycidyl isocyanurate, 6 parts of methyl hexahydrophthalic anhydride, 7.5 parts of precipitated barium sulfate (Fuping), 20 parts of rutile titanium dioxide (R969), 1 part of flatting agent (M88) and 0.5 part of benzoin (SY 702);
and fully stirring and mixing the polyester resin, the epoxy resin, the triglycidyl isocyanurate, the methyl hexahydrophthalic anhydride, the precipitated barium sulfate, the rutile type titanium pigment, the flatting agent and the benzoin, and carrying out melt extrusion, cooling, tabletting and crushing to obtain the epoxy polyester thermosetting powder coating.
Example 4
Weighing all raw materials for standby according to a formula of 48 parts of polyester resin (4 ET), 10 parts of epoxy resin (consisting of hydrogenated bisphenol A epoxy resin and alicyclic modified bisphenol A epoxy acrylic resin with the mass ratio of 1:2), 4 parts of triglycidyl isocyanurate, 6 parts of methyl hexahydrophthalic anhydride, 7.5 parts of precipitated barium sulfate (Fuping), 20 parts of rutile titanium dioxide (R969), 1 part of flatting agent (M88) and 0.5 part of benzoin (SY 702);
and fully stirring and mixing the polyester resin, the epoxy resin, the triglycidyl isocyanurate, the methyl hexahydrophthalic anhydride, the precipitated barium sulfate, the rutile type titanium pigment, the flatting agent and the benzoin, and carrying out melt extrusion, cooling, tabletting and crushing to obtain the epoxy polyester thermosetting powder coating.
Example 5
Weighing all raw materials for standby according to a formula of 48 parts of polyester resin (4 ET), 10 parts of epoxy resin (consisting of hydrogenated bisphenol A epoxy resin and alicyclic modified bisphenol A epoxy acrylic resin with the mass ratio of 1:3), 4 parts of triglycidyl isocyanurate, 6 parts of methyl hexahydrophthalic anhydride, 7.5 parts of precipitated barium sulfate (Fuping), 20 parts of rutile titanium dioxide (R969), 1 part of flatting agent (M88) and 0.5 part of benzoin (SY 702);
and fully stirring and mixing the polyester resin, the epoxy resin, the triglycidyl isocyanurate, the methyl hexahydrophthalic anhydride, the precipitated barium sulfate, the rutile type titanium pigment, the flatting agent and the benzoin, and carrying out melt extrusion, cooling, tabletting and crushing to obtain the epoxy polyester thermosetting powder coating.
Example 6
Weighing raw materials according to a formula of 40 parts of polyester resin (4 ET), 6 parts of epoxy resin (consisting of hydrogenated bisphenol A epoxy resin and alicyclic modified bisphenol A epoxy acrylic resin with the mass ratio of 1:2), 3.5 parts of triglycidyl isocyanurate, 3.6 parts of methyl hexahydrophthalic anhydride, 5 parts of precipitated barium sulfate (rich flat), 18 parts of rutile titanium dioxide (R969), 0.8 part of flatting agent (M88) and 0.3 part of benzoin (SY 702) for later use;
and fully stirring and mixing the polyester resin, the epoxy resin, the triglycidyl isocyanurate, the methyl hexahydrophthalic anhydride, the precipitated barium sulfate, the rutile type titanium pigment, the flatting agent and the benzoin, and carrying out melt extrusion, cooling, tabletting and crushing to obtain the epoxy polyester thermosetting powder coating.
Example 7
Weighing all raw materials according to a formula of 55 parts of polyester resin (4 ET), 15 parts of epoxy resin (consisting of hydrogenated bisphenol A epoxy resin and alicyclic modified bisphenol A epoxy acrylic resin with the mass ratio of 1:2), 4.6 parts of triglycidyl isocyanurate, 9 parts of methyl hexahydrophthalic anhydride, 15 parts of precipitated barium sulfate (Fuping), 25 parts of rutile titanium dioxide (R969), 1.2 parts of flatting agent (M88) and 0.6 part of benzoin (SY 702) for later use;
and fully stirring and mixing the polyester resin, the epoxy resin, the triglycidyl isocyanurate, the methyl hexahydrophthalic anhydride, the precipitated barium sulfate, the rutile type titanium pigment, the flatting agent and the benzoin, and carrying out melt extrusion, cooling, tabletting and crushing to obtain the epoxy polyester thermosetting powder coating.
Comparative example
The existing commercial pure polyester weather-proof powder coating.
The powder coatings prepared in examples 1 to 7 and comparative example were respectively subjected to electrostatic spraying, and after each of the spray specifications was 100×55x1mm, 4 tinplate (labeled A, B, C, D plate, wherein a plate is a comparative plate, B, C, D is a solvent-resistant test plate) with clean surface were baked and cooled in a constant temperature electric furnace at 200 ℃ for 15 minutes for use.
The boards A of examples 1 to 7 and comparative example were subjected to a comprehensive performance test, and the test results are shown in Table 1 below.
TABLE 1
Figure BDA0003791103060000081
Solvent wiping tests were performed on panels B, C, D of examples 1-7 and comparative examples, wherein the wiping solvent for panel B was tenna water, the wiping solvent for panel C was acetone, and the wiping solvent for panel D was butanone. The detection method comprises the following steps: putting on the protective rubber glove for experiments, immersing clean white cloth into a solvent, taking out the white cloth, slightly twisting the white cloth until the white cloth does not drip, slightly wiping the white cloth on a flat test plate surface for 5 times according to a stroke of 100mm, and detecting after 5 minutes after each round is performed for about 2 seconds. The test results are shown in Table 2 below.
TABLE 2
Figure BDA0003791103060000091
Figure BDA0003791103060000101
From the comparison of the above data, the gloss and color difference changes of the powder coatings prepared in examples 1 to 7 are obviously smaller than those of the comparative examples, namely, the solvent resistance of the powder coatings in examples 1 to 7 is better than that of the comparative examples; in addition, as can be seen from various examples, the solvent resistance of the obtained coating powder is affected by the proportions of polyester resin, epoxy resin, triglycidyl isocyanurate, methyl hexahydrophthalic anhydride, precipitated barium sulfate, rutile type titanium dioxide, flatting agent and benzoin, and the types of epoxy resin, and a large number of proportion tests prove that the formula with ideal proportion is finally obtained: 48 parts of polyester resin, 10 parts of epoxy resin (consisting of hydrogenated bisphenol A epoxy resin and alicyclic modified bisphenol A epoxy acrylic resin in a mass ratio of 1:2), 4 parts of triglycidyl isocyanurate, 6 parts of methyl hexahydrophthalic anhydride, 7.5 parts of precipitated barium sulfate, 20 parts of rutile type titanium dioxide, 1 part of flatting agent and 0.5 part of benzoin.
Example 8
Adding 10% hexazine into a reaction kettle for chemical combinationAdding 10% carboxylate resin into the solvent under stirring, and introducing N 2 Protecting and heating to 120 ℃ and then reacting for 1h, adding excessive ethanolamine under stirring, reducing the temperature to 80 ℃ and reacting for 2h, cooling to room temperature after the reaction is completed, and cooling and crystallizing the resultant liquid to obtain antirust powder;
the preparation method comprises the steps of reacting tetrabutyl titanate with alcohol amine, specifically, taking 40% distilled water, using acetic acid to adjust the pH value of the solution to 5, adding 40% gamma- (2, 3-glycidoxy) propyl trimethoxy silane and 10% tetrabutyl titanate, stirring and hydrolyzing at 55 ℃ to obtain a uniform and stable solution, adding 10% alcohol amine, stirring and reacting for about 1.5h, and cooling to obtain a film forming agent;
weighing all raw materials according to a formula of 48 parts of polyester resin (4 ET), 10 parts of epoxy resin (consisting of hydrogenated bisphenol A epoxy resin and alicyclic modified bisphenol A epoxy acrylic resin with the mass ratio of 1:2), 4 parts of triglycidyl isocyanurate, 6 parts of methyl hexahydrophthalic anhydride, 7.5 parts of precipitated barium sulfate (Fuping), 20 parts of rutile titanium dioxide (R969), 1 part of flatting agent (M88), 0.5 part of benzoin (SY 702), 0.4 part of antirust powder and 0.04 part of film forming agent for later use;
the polyester resin, the epoxy resin, the triglycidyl isocyanurate, the methyl hexahydrophthalic anhydride, the precipitated barium sulfate, the rutile type titanium pigment, the flatting agent, the benzoin, the antirust powder and the film forming agent are fully stirred and mixed, and the epoxy polyester thermosetting powder coating is obtained by melt extrusion, cooling and tabletting and crushing.
The epoxy polyester thermosetting powder coating prepared in example 8 is subjected to electrostatic spraying and thermal curing to form a powder coating, and salt spray corrosion resistance test is carried out on the powder coating, wherein the test result is as follows: the spray pressure for resisting salt spray corrosion is 0.098Mpa, the salt solution concentration is 5%, the pH is 6.5-7.2, the temperature of the test chamber is 35 ℃, the temperature is 45 ℃, and the spray quantity is 2mL/80cm 2 And (3) spraying for 1000 hours is unchanged, and the anti-corrosion and rust-preventing effects are excellent.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but is intended to cover any and all modifications, equivalents, and alternatives falling within the spirit and principles of the present application.

Claims (3)

1. The epoxy polyester thermosetting powder coating is characterized by comprising the following raw materials in parts by weight:
40-55 parts of polyester resin, 6-15 parts of epoxy resin, 3.5-4.6 parts of triglycidyl isocyanurate, 3.6-9 parts of methyl hexahydrophthalic anhydride, 5-15 parts of precipitated barium sulfate, 18-25 parts of rutile type titanium dioxide, 0.8-1.2 parts of flatting agent and 0.3-0.6 part of benzoin;
the epoxy resin comprises the following components in percentage by mass: 2 and a cycloaliphatic modified bisphenol a epoxy acrylic resin;
the epoxy polyester thermosetting powder coating also comprises 0.2-0.6 part of antirust powder and 0.03-0.05 part of film forming agent;
the antirust powder is prepared by reacting carboxylate resin with ethanolamine;
the film forming agent is prepared by reacting tetrabutyl titanate and gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane with alcohol amine after the catalysis of acetic acid at 55-65 ℃.
2. The epoxy polyester thermosetting powder coating according to claim 1, comprising the following raw materials in parts by weight:
48 parts of polyester resin, 10 parts of epoxy resin, 4 parts of triglycidyl isocyanurate, 6 parts of methyl hexahydrophthalic anhydride, 7.5 parts of precipitated barium sulfate, 20 parts of rutile type titanium dioxide, 1 part of flatting agent and 0.5 part of benzoin.
3. A method for preparing an epoxy polyester thermosetting powder coating, which is characterized by comprising the following steps:
weighing all raw materials according to the formula of the epoxy polyester thermosetting powder coating according to any one of claims 1-2 for later use;
fully stirring and mixing polyester resin, epoxy resin, triglycidyl isocyanurate, methyl hexahydrophthalic anhydride, precipitated barium sulfate, rutile type titanium white, a leveling agent, benzoin, antirust powder and a film forming agent, and carrying out melt extrusion, cooling, tabletting and crushing to obtain the modified polyester resin.
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