CN114836111B - Fluorine modified polyester system water-based coil steel coating and preparation method thereof - Google Patents
Fluorine modified polyester system water-based coil steel coating and preparation method thereof Download PDFInfo
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- CN114836111B CN114836111B CN202210651982.5A CN202210651982A CN114836111B CN 114836111 B CN114836111 B CN 114836111B CN 202210651982 A CN202210651982 A CN 202210651982A CN 114836111 B CN114836111 B CN 114836111B
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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
- C09D167/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
- C09D167/025—Polyesters derived from dicarboxylic acids and dihydroxy compounds containing polyether sequences
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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
- 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
- C09D7/20—Diluents or solvents
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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
- 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
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Abstract
The invention discloses a fluorine modified polyester system water-based coil steel coating and a preparation method thereof. Wherein the fluorine modified polyester resin is prepared from raw materials such as hexafluoro-alkylene oxide, methanol, diethylene glycol, trimethylolpropane, versatic acid glycidyl ester, 1, 4-cyclohexane dicarboxylic acid, phthalic anhydride, isophthalic acid, a neutralizer, deionized water and the like through reaction; the fluorine modified polyester system water-based coil steel coating provided by the invention has the ultra-long weather resistance of the fluorine-containing polyester coating, the salt spray resistance, corrosion resistance, chalking resistance, folding resistance and other properties of the fluorine-containing polyester coating, and also has very good environmental protection, so that the fluorine modified polyester system water-based coil steel coating is a water-based protective coating very suitable for metal coiled materials.
Description
Technical Field
The invention belongs to the technical field of water-based industrial coatings, and particularly relates to a fluorine modified polyester system water-based coil steel coating and a preparation method thereof.
Background
The coating of the coil steel coating is to take a cold-rolled steel plate, a galvanized steel plate, an aluminized zinc steel plate and the like as a substrate, adopt a highly-automatic roller coating production mode, and form a film after degreasing, chemical treatment, priming, high-temperature baking, top coating and high-temperature baking of the steel plate, and achieve a coating with certain physical properties and chemical properties. About 70% of the yield of the color steel plate is used for building, while the color plate for household appliances also occupies a certain proportion, about 10% -20%, and the rest is used for business, container materials, traffic and automobiles, metal furniture and the like.
Because the color steel plates have different applications, the requirements on the used paint are different, for example, the building paint color plates are divided into three major types of internal use, external use and other applications, wherein 60% -70% of the building paint color plates are external use plates, and are mainly used for roof cover plates (more than 30% of the total amount) and outer wall plates (more than 30% of the total amount), the building external use color plates are subjected to wind blowing, sun drying and rain for a long time and subjected to cold and summer heat changes for many years, and the main performances required are impact resistance, wind resistance, fire resistance, water leakage prevention, heat insulation, sound insulation, weather resistance, pollution resistance, processing repair property and the like, and the building external use color plates also need to have attractive color tone, new style, rich texture and be coordinated with the whole building and surrounding environment. Galvanized sheets are increasingly adopted by the steel plates used for the color plates for the household appliances abroad, the original cold-rolled sheets or electrogalvanized sheets are gradually replaced by the galvanized sheets without spangles, and the color plates for the household appliances have higher requirements on the surface quality of the paint, and the paint is required to have pollution resistance, corrosion resistance, weather resistance, processability and proper hardness.
People concentrate on the water-based coil coating, but because the weather resistance, flexibility and other performances of the coil coating are not very good in the water-based process, the water-based coil coating can not be used for replacing oily products all the time in the industry, and the VOC emission of the coil coating is very high, which is not beneficial to environmental protection and the green development road of enterprises.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a fluorine modified polyester system water-based coil steel coating and a preparation method thereof, which are used for solving various problems encountered in the background art.
In order to achieve the purpose of the invention, the following technical scheme is adopted: a fluorine modified polyester system water-based coil steel coating comprises the following components: 40 to 60 parts of aqueous fluorine modified polyester resin, 5 to 15 parts of amino resin, 5 to 20 parts of pigment and filler, 0.2 to 1 part of catalyst, 0.1 to 0.6 part of leveling agent, 0.1 to 0.8 part of adhesion promoter, 10 to 35 parts of deionized water, 2 to 6 parts of dispersing agent, 1 to 10 parts of film forming auxiliary agent, 0.1 to 0.5 part of defoaming agent, 0.2 to 0.6 part of wetting agent and 1 to 6 parts of pH regulator.
As a preferable technical scheme of the invention, the fluorine modified polyester system water-based coil steel coating comprises the following components: 40 to 50 parts of aqueous fluorine modified polyester resin, 5 to 10 parts of amino resin, 10 to 20 parts of pigment and filler, 0.2 to 0.8 part of catalyst, 0.1 to 0.3 part of leveling agent, 0.1 to 0.6 part of adhesion promoter, 15 to 30 parts of deionized water, 3 to 6 parts of dispersing agent, 3 to 8 parts of film forming auxiliary agent, 0.1 to 0.3 part of defoaming agent, 0.3 to 0.5 part of wetting agent and 2 to 4 parts of pH regulator.
As a further preferable technical scheme of the invention, the fluorine modified polyester system water-based coil steel coating comprises the following components: 40 parts of aqueous fluorine modified polyester resin, 10 parts of amino resin, 8 parts of pigment and filler, 0.6 part of catalyst, 0.3 part of leveling agent, 0.3 part of adhesion promoter, 31.3 parts of deionized water, 3 parts of dispersing agent, 5 parts of film forming auxiliary agent, 0.3 part of defoaming agent, 0.2 part of wetting agent and 1 part of pH regulator.
As a preferable technical scheme of the invention, the amino resin is as follows: at least one of a fully methylated amino resin, a partially methylated amino resin, a butylated amino resin, and a methyl butyl mixed etherified amino resin, and specifically one of Zhan Xin 323, zhan Xin 325, and Zhan Xin 385.
As a preferable technical scheme of the invention, the dispersing agent is one of Efka-1502, BYK-190 and BYK-2012.
As a preferable technical scheme of the invention, the defoamer is any one of polyether siloxane, acrylic ester, polyether modified dimethyl siloxane and polyester modified polysiloxane, and specifically one of tego810, byk028, byk1610 and byk 055.
As a preferred technical scheme of the invention, the pigment and filler is as follows: one or more of phthalocyanine blue pigment, phthalocyanine green pigment, organic red pigment, iron yellow pigment, titanium pigment, carbon black, barium sulfate, extinction powder, zinc phosphate, aluminum tripolyphosphate and mica powder are mixed.
As a preferable technical scheme of the invention, the catalyst is as follows: the acid catalyst is one or more of p-toluenesulfonic acid, dodecylbenzenesulfonic acid, isooctanoic acid and dinonylnaphthalene disulfonic acid, and specifically one of KING NACURE X49-110, NACURE 2500 and NACURE 5225.
As a preferable technical scheme of the invention, the adhesion promoter is as follows: any one or more of silane coupling agent, titanate coupling agent and aluminate coupling agent are mixed.
A fluorine modified polyester system water-based coil steel coating and a preparation method thereof comprise the following steps:
(1) Synthesis of fluorine modified polyester resin: sequentially weighing raw materials such as hexafluoroalkylene oxide, a catalyst and the like according to weight, reacting for 15 hours at a certain temperature, and then carrying out distillation separation to obtain a polyether fluoropolymer with Mw greater than 3500; and (3) reacting the prepared polyether fluoropolymer with methanol at a certain temperature to obtain the fluoropolyether methyl ester polymer. Sequentially weighing fluoropolyether methyl ester polymer, diethylene glycol, trimethylolpropane, tertiary glycidyl ester, 1, 4-cyclohexanedicarboxylic acid, phthalic anhydride, isophthalic acid and catalyst, adding into a reaction kettle, heating, stirring at low speed, and introducing N 2 Heating to 130 ℃, preserving heat for 1.0h, removing free water in the raw materials, rapidly heating to 180 ℃, stirring and preserving heat for 2h at the rotating speed of 450-550 r/min after the materials are fully stirred and dissolved, then heating to 230 ℃ at the speed of 25 ℃/h, preserving heat for 3h, measuring the acid value and the viscosity every 20min, and when the acid value and the viscosity reach the theoretical design value; cooling to 170 ℃, vacuumizing, evaporating to remove the solvent, cooling to below 50 ℃, adding a neutralizing agent, rapidly stirring and dispersing for 20min, adding deionized water with a formula amount, and continuously stirring for 0.5h until the mixture is uniformly dispersed to obtain the water-based fluorine-modified polyester resin;
(2) Sequentially weighing 30-50 parts of water-based fluorine modified polyester resin, 15-30 parts of pigment, 5-10 parts of filler, 2-8 parts of dispersing agent, 10-40 parts of water, 0.2-0.6 part of defoamer and 1-4 parts of pH regulator into a dispersing cylinder, dispersing the materials for 30min under the condition of 800r/min until the materials are uniformly dispersed, and grinding the materials to a certain fineness by a sand mill to prepare slurry A for standby;
(3) Sequentially weighing aqueous fluorine modified polyester resin, amino resin and pH regulator according to parts by weight, uniformly dispersing the materials under the condition of 800r/min, then adding an acid catalyst, a filler, a wetting and leveling agent, an adhesion promoter, a defoaming agent, a film forming additive and water, and uniformly dispersing the materials under the condition of 1200r/min to prepare an intermediate B for later use;
(4) The slurry A and the intermediate B are mixed according to a certain proportion, and then water is used for adjusting the viscosity to a certain degree, so that the fluorine modified polyester system water-based coil coating is prepared.
The water paint for coiled steel with fluorine modified polyester system is prepared through rolling paint onto coiled steel substrate and baking at 210-250 deg.c for 20-100 s. The coating thickness is 3-30 μm.
The fluorine modified polyester system water-based coil steel coating can be used for cold-rolled steel plates, galvanized steel plates, aluminum-zinc plated plates, stainless steel plates and the like.
The water-based coil coating provided by the invention can reduce VOC emissions by more than about 20 ten thousand tons per year in China (the coil coating yield in 2020 is about 80 ten thousand tons, the coatings are all oil-based coatings, and the VOC content in the coatings is about 30%, so that the VOC discharged from the coil coating per year exceeds 20 ten thousand tons).
The invention discloses a fluorine modified polyester system water-based coil steel coating, which is an environment-friendly water-based coil steel coating, and belongs to a water-based coil steel coating with high uv resistance, acid and alkali resistance and T-bend resistance.
Compared with the existing oily products, the invention has the following excellent effects:
(1) The fluorine modified polyester system water-based coil steel coating has the advantages of high T-bend resistance, stamping resistance, excellent post-processing performance, high flexibility, acid resistance, alkali resistance, salt fog resistance, uv resistance, good quick drying performance and the like.
(2) The invention solves the defects that the water-based coil steel coating has poorer performances such as weather resistance, bending resistance and the like than an oily product.
(3) The invention solves the adhesion problem of the substrate and can meet the requirement of high performance of the coating by selecting adhesion promoters with different characteristics.
(4) The invention successfully solves the problem of overlong baking time required by the water-based coil coating by reasonably proportioning the fluorine modified polyester resin and the amino and selecting the variety of the acid catalyst, especially by reasonably selecting the dosage of the acid catalyst when different amino resins are proportioned, thereby reaching or being superior to the curing time required by the oil-based similar coating.
(5) The water-based coil steel coating disclosed by the invention belongs to a water-based product, is low in VOC, plays a great role in protecting the health of production personnel, has extremely high economic and social benefits, and promotes the healthy development of society and enterprises.
Detailed Description
In order to better explain the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with examples in the embodiments of the present invention, and the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
Embodiment one:
(1) 40 parts of aqueous fluorine modified polyester resin, 15 parts of blue pigment, 5 parts of barium sulfate, 2 parts of dispersing agent, 30 parts of water, 0.2 part of defoaming agent and 3 parts of pH regulator are sequentially weighed according to parts by weight and put into a dispersing cylinder, the materials are dispersed for 30min under the condition of 800r/min until the materials are uniformly dispersed, and then the materials are ground to a certain fineness by a sand mill to prepare slurry A for standby;
(2) Sequentially weighing 40 parts of aqueous fluorine modified polyester resin, 8 parts of amino resin and 2 parts of pH regulator according to parts by weight, uniformly dispersing the materials under the condition of 800r/min, then adding 0.5 part of acid catalyst, 0.3 part of wetting and leveling agent, 0.3 part of adhesion promoter, 0.2 part of defoamer, 3 parts of film forming auxiliary agent and 30 parts of water, and uniformly dispersing the materials under the condition of 1200r/min to prepare an intermediate B for standby;
(3) The slurry A and the intermediate B are mixed according to the proportion of 4/6, and then water is used for adjusting the mixture to 60-70S (four cups are coated), so that the fluorine modified polyester system water-based coil coating is prepared.
Embodiment two:
(1) 40 parts of aqueous fluorine modified polyester resin, 13 parts of red pigment, 5 parts of barium sulfate, 2 parts of dispersing agent, 35 parts of water, 0.2 part of defoaming agent and 3 parts of pH regulator are sequentially weighed according to parts by weight and put into a dispersing cylinder, the materials are dispersed for 30min under the condition of 800r/min until the materials are uniformly dispersed, and then the materials are ground to a certain fineness by a sand mill to prepare slurry A for standby;
(2) Sequentially weighing 42 parts by weight of aqueous fluorine modified polyester resin, 9 parts by weight of amino resin and 2 parts by weight of pH regulator, uniformly dispersing the materials under the condition of 800r/min, then adding 0.5 part by weight of acid catalyst, 0.3 part by weight of wetting and leveling agent, 0.3 part by weight of adhesion promoter, 0.2 part by weight of defoamer, 3 parts by weight of film-forming auxiliary agent and 30 parts by weight of water, and uniformly dispersing the materials under the condition of 1200r/min to prepare an intermediate B for standby;
(3) The slurry A and the intermediate B are mixed according to the proportion of 35/65, and then water is used for adjusting the mixture to 60-70S (four cups are coated), so that the fluorine modified polyester system water-based coil coating is prepared.
Embodiment III:
(1) Sequentially weighing 30 parts of water-based fluorine modified polyester resin, 35 parts of iron red pigment, 5 parts of zinc phosphate, 3 parts of dispersing agent, 35 parts of water, 0.2 part of defoaming agent and 3 parts of pH regulator into a dispersing cylinder, dispersing the materials for 30min under the condition of 800r/min until the materials are uniformly dispersed, and grinding the materials to a certain fineness by a sand mill to prepare slurry A for standby;
(2) Sequentially weighing 45 parts of aqueous fluorine modified polyester resin, 7 parts of amino resin and 2 parts of pH regulator according to parts by weight, uniformly dispersing the materials under the condition of 800r/min, then adding 0.5 part of acid catalyst, 0.3 part of wetting and leveling agent, 0.3 part of adhesion promoter, 0.2 part of defoamer, 3 parts of film forming auxiliary agent and 30 parts of water, and uniformly dispersing the materials under the condition of 1200r/min to prepare an intermediate B for standby;
(3) The slurry A and the intermediate B are mixed according to the proportion of 45/55, and then water is used for adjusting the mixture to 60-70S (four cups are coated), so that the fluorine modified polyester system water-based coil coating is prepared.
Embodiment four:
(1) Sequentially weighing 25 parts of water-based fluorine modified polyester resin, 40 parts of iron yellow pigment and 6 parts of aluminum tripolyphosphate according to parts by weight, dispersing agent 2 parts, water 35 parts, defoaming agent 0.2 part and pH regulator 3 parts into a dispersing cylinder, dispersing the materials for 30min under the condition of 800r/min until the materials are uniformly dispersed, and grinding the materials to a certain fineness by a sand mill to prepare slurry A for standby;
(2) Sequentially weighing 38 parts of aqueous fluorine modified polyester resin, 9 parts of amino resin and 2 parts of pH regulator according to parts by weight, uniformly dispersing the materials under the condition of 800r/min, then adding 0.5 part of acid catalyst, 0.3 part of wetting and leveling agent, 0.3 part of adhesion promoter, 0.2 part of defoamer, 3 parts of film forming auxiliary agent and 30 parts of water, and uniformly dispersing the materials under the condition of 1200r/min to prepare an intermediate B for standby;
(3) The slurry A and the intermediate B are mixed according to the proportion of 4/6, and then water is used for adjusting the mixture to 60-70S (four cups are coated), so that the fluorine modified polyester system water-based coil coating is prepared.
Fifth embodiment:
(1) Sequentially weighing 25 parts of aqueous fluorine modified polyester resin, 50 parts of titanium dioxide, 5 parts of barium sulfate, 2 parts of dispersing agent, 20 parts of water, 0.2 part of defoaming agent and 3 parts of pH regulator into a dispersing cylinder according to parts by weight, dispersing the materials for 30min under the condition of 800r/min until the materials are uniformly dispersed, and grinding the materials to a certain fineness by a sand mill to prepare slurry A for standby;
(2) Sequentially weighing 42 parts by weight of aqueous fluorine modified polyester resin, 8 parts by weight of amino resin and 2 parts by weight of pH regulator, uniformly dispersing the materials under the condition of 800r/min, then adding 0.5 part by weight of acid catalyst, 0.3 part by weight of wetting and leveling agent, 0.3 part by weight of adhesion promoter, 0.2 part by weight of defoamer, 3 parts by weight of film-forming auxiliary agent and 30 parts by weight of water, and uniformly dispersing the materials under the condition of 1200r/min to prepare an intermediate B for standby;
(3) The slurry A and the intermediate B are mixed according to the proportion of 4/6, and then water is used for adjusting the mixture to 60-70S (four cups are coated), so that the fluorine modified polyester system water-based coil coating is prepared.
Example six:
(1) 40 parts of aqueous fluorine modified polyester resin, 10 parts of carbon black, 5 parts of barium sulfate, 2 parts of dispersing agent, 35 parts of water, 0.2 part of defoaming agent and 3 parts of pH regulator are sequentially weighed according to parts by weight and put into a dispersing cylinder, the materials are dispersed for 30min under the condition of 800r/min until the materials are uniformly dispersed, and then the materials are ground to a certain fineness by a sand mill to prepare slurry A for standby;
(2) Sequentially weighing 40 parts of aqueous fluorine modified polyester resin, 9 parts of amino resin and 2 parts of pH regulator according to parts by weight, uniformly dispersing the materials under the condition of 800r/min, then adding 0.5 part of acid catalyst, 0.3 part of wetting and leveling agent, 0.3 part of adhesion promoter, 0.2 part of defoamer, 3 parts of film forming auxiliary agent and 30 parts of water, and uniformly dispersing the materials under the condition of 1200r/min to prepare an intermediate B for standby;
(3) The slurry A and the intermediate B are mixed according to the proportion of 4/6, and then water is used for adjusting the mixture to 60-70S (four cups are coated), so that the fluorine modified polyester system water-based coil coating is prepared.
Referring to the test method of GB/T13448-2019, the performances of paint film coatings prepared by the products in examples one to six are tested, and the test results are shown in Table 1.
TABLE 1
The above examples are only illustrative of the invention and are not intended to limit the embodiments of the invention. Other variations and modifications of the various aspects will be apparent to those of skill in the art and it is not necessary nor intended to be exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (8)
1. A fluorine modified polyester system water-based coil steel coating is characterized in that: the composition of the adhesive comprises the following components in parts by weight: 40 to 60 parts of aqueous fluorine modified polyester resin, 5 to 15 parts of amino resin, 5 to 20 parts of pigment and filler, 0.2 to 1 part of acid catalyst, 0.1 to 0.6 part of flatting agent, 0.1 to 0.8 part of adhesion promoter, 10 to 35 parts of deionized water, 2 to 6 parts of dispersing agent, 1 to 10 parts of film forming auxiliary agent, 0.1 to 0.5 part of defoaming agent, 0.2 to 0.6 part of wetting agent and 1 to 6 parts of pH regulator;
the preparation method of the aqueous fluorine modified polyester resin comprises the following steps:
sequentially weighing hexafluoroalkylene oxide and catalyst raw materials according to weight, reacting for 15 hours at a certain temperature, and then carrying out distillation separation to obtain polyether fluoropolymer with Mw greater than 3500; reacting the prepared polyether fluoropolymer with methanol at a certain temperature to obtain a fluoropolyether methyl ester polymer; sequentially weighing fluoropolyether methyl ester polymer, diethylene glycol, trimethylolpropane, tertiary glycidyl ester, 1, 4-cyclohexanedicarboxylic acid, phthalic anhydride, isophthalic acid and catalyst, adding into a reaction kettle, heating, stirring at low speed, and introducing N 2 Heating to 130 ℃, preserving heat for 1.0h, removing free water in the raw materials, rapidly heating to 180 ℃, stirring and preserving heat for 2h at the rotating speed of 450-550 r/min after the materials are fully stirred and dissolved, then heating to 230 ℃ at the speed of 25 ℃/h, preserving heat for 3h, measuring the acid value and the viscosity every 20min, and when the acid value and the viscosity reach the theoretical design value; cooling to 170 ℃, vacuumizing, evaporating to remove the solvent, cooling to below 50 ℃, adding a neutralizing agent, rapidly stirring and dispersing for 20min, adding deionized water with a formula amount, and continuously stirring for 0.5h until the mixture is uniformly dispersed to obtain the water-based fluorine-modified polyester resin;
the aqueous fluorine modified polyester resin comprises the following monomers in parts by weight: 5-20 parts of hexafluoro alkylene oxide, 10-20 parts of methanol, 5-20 parts of diethylene glycol, 4-10 parts of trimethylolpropane, 2-6 parts of tertiary glycidyl ester, 3-10 parts of 1, 4-cyclohexane dicarboxylic acid, 3-10 parts of phthalic anhydride, 2-6 parts of isophthalic acid, 1-3 parts of catalyst, 1-3 parts of neutralizer and 30-50 parts of deionized water.
2. The fluorine-modified polyester system water-based coil coating as claimed in claim 1, which is characterized by comprising the following raw materials in parts by weight: 40 parts of aqueous fluorine modified polyester resin, 10 parts of amino resin, 8 parts of pigment and filler, 0.6 part of acid catalyst, 0.3 part of leveling agent, 0.3 part of adhesion promoter, 31.3 parts of deionized water, 3 parts of dispersing agent, 5 parts of film forming auxiliary agent, 0.3 part of defoaming agent, 0.2 part of wetting agent and 1 part of pH regulator.
3. The fluorine-modified polyester system water-based coil coating according to claim 1, wherein the amino resin is: at least one of a fully methylated amino resin, a partially methylated amino resin, a butylated amino resin and a methyl butyl mixed etherified amino resin.
4. The fluorine-modified polyester system water-based coil coating according to claim 1, wherein the pigment filler is: one or more of phthalocyanine blue pigment, phthalocyanine green pigment, organic red pigment, iron yellow pigment, titanium pigment, carbon black, barium sulfate, extinction powder, zinc phosphate, aluminum tripolyphosphate and mica powder are mixed.
5. The fluorine-modified polyester system water-based coil coating according to claim 1, wherein the acid catalyst is: one or more combinations of p-toluene sulfonic acid, dodecylbenzene sulfonic acid, isooctanoic acid, dinonylnaphthalene disulfonic acid.
6. The fluorine-modified polyester system water-based coil coating according to claim 1, wherein the defoamer is: any one or more of polyether siloxane, acrylic ester and polyester modified polysiloxane are mixed.
7. The fluorine-modified polyester system water-based coil coating according to claim 1, wherein the adhesion promoter is: any one or more of silane coupling agent, titanate coupling agent and aluminate coupling agent are mixed.
8. The fluorine-modified polyester system water-based coil coating according to claim 1, wherein the pH adjustor is: one or more of dimethylethanolamine, monoethanolamine, ammonia, and AMP 95.
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