CN114045095B - Polyester transparent powder coating and preparation method thereof - Google Patents
Polyester transparent powder 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
- 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
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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
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/34—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from hydroxy compounds or their metallic derivatives
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- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
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- 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
- C08K3/24—Acids; Salts thereof
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
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Abstract
The invention discloses a polyester transparent powder coating, which comprises the following raw materials: polyester resin, diethanol amine, methyl acrylate, trimethylolpropane, a catalyst, stearic acid, barium sulfate, calcium carbonate, silicon dioxide, graphene, a curing agent, a dispersing agent, a flatting agent, a light stabilizer and a defoaming agent; the mass ratio of the polyester resin, diethanol amine, methyl acrylate, trimethylolpropane, catalyst, stearic acid, barium sulfate, calcium carbonate, silicon dioxide, graphene, curing agent, dispersing agent, flatting agent, light stabilizer and defoaming agent is 40-100: 1-3: 3-8: 1-5: 2-6: 0.1-1: 5-10: 1-5: 5-15: 1-3: 1-5: 1-2: 1-2: 1-2: 1-5. The invention also discloses a preparation method of the polyester transparent powder coating. The polyester transparent powder coating obtained by the invention has high transparency and excellent leveling property, and the coating has extremely high adhesion strength and is flat, smooth and clean.
Description
Technical Field
The invention relates to the technical field of powder coatings, in particular to a polyester transparent powder coating and a preparation method thereof.
Background
The powder coating has a completely different form from general coating, and it exists in a state of fine powder. The powder coating is a novel solvent-free 100% solid powder coating, and has the characteristics of no solvent, no pollution, recoverability, environmental protection, energy and resource saving, labor intensity reduction, high mechanical strength of film coating and the like.
The transparent powder coating mainly comprises acrylic resin series and polyester resin series. The acrylic transparent powder coating has good coating transparency, high crosslinking density, excellent weather resistance and good coating comprehensive performance. But the application and popularization of the paint are greatly limited due to high requirements on production and coating processes and high raw material cost and manufacturing cost. The polyester transparent powder coating is generally prepared by using polyester resin as a base material and blocked isocyanate as a curing agent, wherein the polyester resin has a polar group, has the characteristics of higher powdering rate than epoxy resin, difficult yellowing in the baking process, high glossiness, good leveling property, plump paint film, light color and the like, and has the advantages of no solvent, no pollution, energy and resource conservation, labor intensity reduction, high mechanical strength of the paint film and the like compared with the common coating.
Compared with other types of powder coatings, the polyester powder coating has lower raw material cost and production cost, and the whole film layer of the product after spray molding is stable, so the polyester powder coating has good use prospect, but the coating of the polyester transparent powder coating has poor transparency and leveling property which can not reach the level of acrylic transparent powder coating, and has poor surface aesthetic degree and durability.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a polyester transparent powder coating and a preparation method thereof.
The polyester transparent powder coating comprises the following raw materials: polyester resin, diethanol amine, methyl acrylate, trimethylolpropane, a catalyst, stearic acid, barium sulfate, calcium carbonate, silicon dioxide, graphene, a curing agent, a dispersing agent, a flatting agent, a light stabilizer and a defoaming agent; the mass ratio of the polyester resin, diethanol amine, methyl acrylate, trimethylolpropane, catalyst, stearic acid, barium sulfate, calcium carbonate, silicon dioxide, graphene, curing agent, dispersing agent, flatting agent, light stabilizer and defoaming agent is 40-100: 1-3: 3-8: 1-5: 2-6: 0.1-1: 5-10: 1-5: 5-15: 1-3: 1-5: 1-2: 1-2: 1-2: 1-5.
Preferably, the catalyst is an acidic catalyst, preferably at least one of concentrated sulfuric acid, concentrated hydrochloric acid, and p-toluenesulfonic acid.
Preferably, the curing agent is an isocyanate or an amino resin.
Preferably, the dispersant is at least one of glyceryl monostearate, glyceryl tristearate, zinc stearate and polyethylene glycol 200.
Preferably, the leveling agent is an organosilicon modified acrylate polymer or polyvinyl butyral.
Preferably, the light stabilizer is a hindered amine light stabilizer.
Preferably, the defoamer is silicone emulsion.
The preparation method of the polyester transparent powder coating comprises the following steps:
s1, mixing barium sulfate, calcium carbonate, silicon dioxide and graphene, and stirring at 100-150 ℃ for 5-15min to obtain a premixed filler;
s2, mixing the polyester resin, the premixed filler, the curing agent, the dispersing agent, the flatting agent, the light stabilizer and the defoaming agent, and stirring for 1-2 hours at 65-75 ℃ to obtain a premix a;
s3, adding diethanolamine into methanol, stirring uniformly, adding methyl acrylate, stirring for 2-4h at 40-50 ℃, carrying out vacuum filtration, adding the mixture into trimethylolpropane, stirring for 1-2h at 50-60 ℃, adding a catalyst, stirring for 1-2h at 120 ℃, carrying out rotary evaporation for 1-2h, adding stearic acid, and continuing to carry out rotary evaporation for 1-2h to obtain a premix b;
and S4, adding the premix b into the premix a, continuously stirring for 10-20min, cooling to room temperature, taking out the mixture, carrying out melt extrusion, tabletting, cooling, carrying out fine grinding, and sieving to obtain the polyester transparent powder coating.
Preferably, in S3, the rotary evaporation temperature is 130-140 ℃, and the rotary evaporation pressure is 0.02-0.04 MPa.
Preferably, in S4, the mesh number is 200 mesh.
The technical effects of the invention are as follows:
(1) according to the invention, diethanol amine is combined with methyl acrylate, then trimethylolpropane acts under the action of a catalyst to form a hydroxyl-terminated hyperbranched polymer, and then the hydroxyl-terminated hyperbranched polymer reacts with a hydrophobic fatty chain with a long chain to form a premix b of a hydroxyl hydrophilic end and a long-chain alkane hydrophobic end, wherein the premix b can effectively solve the problems of poor dispersibility and poor stability of a premix filler in polyester resin, the premix b can be dispersed uniformly, the transparency and adhesive force of a coating film can be effectively improved, and the lowest film forming temperature can be obviously reduced.
(2) The hyperbranched structure of the invention forms a cavity, which can improve the problem that the macromolecular chains are easy to tangle, ensure the full extension of the macromolecular chains, effectively realize the stability of the premix a, reduce the system viscosity, improve the coating property on the polyester resin, and the product has excellent fluidity and strong permeability, which is helpful for improving the adhesive force between the coating and the metal base material, so that the powder coating can be better attached to the metal base material when being applied to the metal base material, and further prevent corrosive media from entering the adhesive surface between the coating and the metal base material.
(3) The polyester transparent powder coating obtained by the invention has high transparency and excellent leveling property, can be quickly cured at low temperature, has the curing speed of 180-190 ℃/3min, and simultaneously, the fatty chain contained in the premix b can fully permeate into the coating, so that the compactness of the coating can be improved, the bending performance of the coating is excellent, the adhesion strength of the coating is extremely high, the coating is flat and smooth, no obvious bubbles, shrinkage cavities or particles exist, the coating is stable, and the integral preparation process is simple.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Example 1
The polyester transparent powder coating comprises the following raw materials: 40kg of polyester resin, 3kg of diethanolamine, 3kg of methyl acrylate, 5kg of trimethylolpropane, 2kg of catalyst, 1kg of stearic acid, 5kg of barium sulfate, 5kg of calcium carbonate, 5kg of silicon dioxide, 3kg of graphene, 1kg of curing agent, 2kg of dispersing agent, 1kg of flatting agent, 2kg of light stabilizer and 1kg of defoaming agent.
The preparation method of the polyester transparent powder coating comprises the following steps:
s1, mixing barium sulfate, calcium carbonate, silicon dioxide and graphene, and stirring for 5min at 150 ℃ to obtain a premixed filler;
s2, adding the polyester resin, the premixed filler, the curing agent, the dispersing agent, the flatting agent, the light stabilizer and the defoaming agent into a high-speed mixing stirrer, and stirring for 1h at 75 ℃ to obtain a premix a;
s3, adding diethanolamine into 40kg of methanol, stirring uniformly, adding methyl acrylate, stirring at 40 ℃ for 4h, carrying out vacuum filtration, adding the mixture into trimethylolpropane, stirring at 50 ℃ for 2h, adding a catalyst, stirring at 100 ℃ for 2h, adding a rotary evaporator, carrying out rotary evaporation at 130 ℃ and under the pressure of 0.04MPa for 1h, adding stearic acid, and continuing to carry out rotary evaporation for 2h to obtain a premix b;
and S4, adding the premix b into the premix a, continuously stirring for 10min, cooling to room temperature, taking out the mixture, adding the mixture into a screw extruder, carrying out melt extrusion, tabletting, cooling to 25 ℃, carrying out fine grinding, and sieving with a 200-mesh sieve to obtain the polyester transparent powder coating.
Example 2
The polyester transparent powder coating comprises the following raw materials: 100kg of polyester resin, 1kg of diethanolamine, 8kg of methyl acrylate, 1kg of trimethylolpropane, 6kg of catalyst, 0.1kg of stearic acid, 10kg of barium sulfate, 1kg of calcium carbonate, 15kg of silicon dioxide, 1kg of graphene, 5kg of curing agent, 1kg of dispersing agent, 2kg of flatting agent, 1kg of light stabilizer and 5kg of defoaming agent.
The preparation method of the polyester transparent powder coating comprises the following steps:
s1, mixing barium sulfate, calcium carbonate, silicon dioxide and graphene, and stirring for 15min at 100 ℃ to obtain a premixed filler;
s2, adding the polyester resin, the premixed filler, the curing agent, the dispersing agent, the flatting agent, the light stabilizer and the defoaming agent into a high-speed mixing stirrer, and stirring for 2 hours at 65 ℃ to obtain a premix a;
s3, adding diethanolamine into 20kg of methanol, stirring uniformly, adding methyl acrylate, stirring at 50 ℃ for 2h, carrying out vacuum filtration, adding into trimethylolpropane, stirring at 60 ℃ for 1h, adding a catalyst, stirring at 120 ℃ for 1h, adding a rotary evaporator, carrying out rotary evaporation at 140 ℃ and 0.02MPa for 2h, adding stearic acid, and continuing to carry out rotary evaporation for 1h to obtain a premix b;
and S4, adding the premix b into the premix a, continuously stirring for 20min, cooling to room temperature, taking out the mixture, adding the mixture into a screw extruder, carrying out melt extrusion, tabletting, cooling to 25 ℃, carrying out fine crushing, and sieving with a 200-mesh sieve to obtain the polyester transparent powder coating.
Example 3
The polyester transparent powder coating comprises the following raw materials: 60kg of polyester resin, 2.5kg of diethanolamine, 4kg of methyl acrylate, 4kg of trimethylolpropane, 3kg of catalyst, 0.7kg of stearic acid, 6kg of barium sulfate, 4kg of calcium carbonate, 8kg of silicon dioxide, 2.5kg of graphene, 2kg of curing agent, 1.7kg of dispersing agent, 1.2kg of flatting agent, 1.8kg of light stabilizer and 2kg of defoaming agent.
The preparation method of the polyester transparent powder coating comprises the following steps:
s1, mixing barium sulfate, calcium carbonate, silicon dioxide and graphene, and stirring for 8min at 140 ℃ to obtain a premixed filler;
s2, adding the polyester resin, the premixed filler, the curing agent, the dispersing agent, the flatting agent, the light stabilizer and the defoaming agent into a high-speed mixing stirrer, and stirring for 1.3 hours at 72 ℃ to obtain premix a;
s3, adding diethanolamine into 35kg of methanol, stirring uniformly, adding methyl acrylate, stirring for 3.5h at 42 ℃, carrying out vacuum filtration, adding the mixture into trimethylolpropane, stirring for 1.7h at 52 ℃, adding a catalyst, stirring for 1.7h at 105 ℃, adding a rotary evaporator, carrying out rotary evaporation for 1.3h at 132 ℃ and under the pressure of 0.035MPa, adding stearic acid, and continuing to carry out rotary evaporation for 1.8h to obtain premix b;
and S4, adding the premix b into the premix a, continuously stirring for 12min, cooling to room temperature, taking out the mixture, adding the mixture into a screw extruder, carrying out melt extrusion, tabletting, cooling to 25 ℃, carrying out fine crushing, and sieving with a 200-mesh sieve to obtain the polyester transparent powder coating.
Example 4
The polyester transparent powder coating comprises the following raw materials: 80kg of polyester resin, 1.5kg of diethanolamine, 6kg of methyl acrylate, 2kg of trimethylolpropane, 5kg of catalyst, 0.3kg of stearic acid, 8kg of barium sulfate, 2kg of calcium carbonate, 12kg of silicon dioxide, 1.5kg of graphene, 4kg of curing agent, 1.3kg of dispersing agent, 1.8kg of flatting agent, 1.4kg of light stabilizer and 4kg of defoaming agent.
The preparation method of the polyester transparent powder coating comprises the following steps:
s1, mixing barium sulfate, calcium carbonate, silicon dioxide and graphene, and stirring at 110 ℃ for 12min to obtain a premixed filler;
s2, adding the polyester resin, the premixed filler, the curing agent, the dispersing agent, the flatting agent, the light stabilizer and the defoaming agent into a high-speed mixing stirrer, and stirring for 1.7 hours at 68 ℃ to obtain premix a;
s3, adding diethanolamine into 25kg of methanol, stirring uniformly, adding methyl acrylate, stirring for 2.5h at 48 ℃, carrying out vacuum filtration, adding into trimethylolpropane, stirring for 1.3h at 58 ℃, adding a catalyst, stirring for 1.3h at 115 ℃, adding into a rotary evaporator, carrying out rotary evaporation for 1.7h at 138 ℃ and under the pressure of 0.025MPa, adding stearic acid, and continuing to carry out rotary evaporation for 1.2h to obtain premix b;
and S4, adding the premix b into the premix a, continuously stirring for 18min, cooling to room temperature, taking out the mixture, adding the mixture into a screw extruder, carrying out melt extrusion, tabletting, cooling to 25 ℃, carrying out fine crushing, and sieving with a 200-mesh sieve to obtain the polyester transparent powder coating.
Example 5
The polyester transparent powder coating comprises the following raw materials: 70kg of polyester resin, 2kg of diethanolamine, 5kg of methyl acrylate, 3kg of trimethylolpropane, 4kg of catalyst, 0.5kg of stearic acid, 7kg of barium sulfate, 3kg of calcium carbonate, 10kg of silicon dioxide, 2kg of graphene, 3kg of curing agent, 1.5kg of dispersing agent, 1.5kg of flatting agent, 1.6kg of light stabilizer and 3kg of defoaming agent.
The preparation method of the polyester transparent powder coating comprises the following steps:
s1, mixing barium sulfate, calcium carbonate, silicon dioxide and graphene, and stirring for 10min at 125 ℃ to obtain a premixed filler;
s2, adding the polyester resin, the premixed filler, the curing agent, the dispersing agent, the flatting agent, the light stabilizer and the defoaming agent into a high-speed mixing stirrer, and stirring for 1.5 hours at 70 ℃ to obtain a premix a;
s3, adding diethanolamine into 30kg of methanol, stirring uniformly, adding methyl acrylate, stirring at 45 ℃ for 3h, carrying out vacuum filtration, adding into trimethylolpropane, stirring at 55 ℃ for 1.5h, adding a catalyst, stirring at 110 ℃ for 1.5h, adding a rotary evaporator, carrying out rotary evaporation at 135 ℃ under the pressure of 0.03MPa for 1.5h, adding stearic acid, and continuing to carry out rotary evaporation for 1.5h to obtain a premix b;
and S4, adding the premix b into the premix a, continuously stirring for 15min, cooling to room temperature, taking out the mixture, adding the mixture into a screw extruder, carrying out melt extrusion, tabletting, cooling to 25 ℃, carrying out fine crushing, and sieving with a 200-mesh sieve to obtain the polyester transparent powder coating.
Comparative example 1
The transparent polyester powder coating is TGIC type polyester resin and is purchased from Shanghai Haoyang industry development Limited company.
Comparative example 2
The polyester transparent powder coating comprises the following raw materials: 70kg of polyester resin, 7kg of barium sulfate, 3kg of calcium carbonate, 10kg of silicon dioxide, 2kg of graphene, 3kg of curing agent, 1.5kg of dispersing agent, 1.5kg of flatting agent, 1.6kg of light stabilizer and 3kg of defoaming agent.
The preparation method of the polyester transparent powder coating comprises the following steps:
s1, mixing barium sulfate, calcium carbonate, silicon dioxide and graphene, and stirring for 10min at 125 ℃ to obtain a premixed filler;
s2, adding the polyester resin, the premixed filler, the curing agent, the dispersing agent, the flatting agent, the light stabilizer and the defoaming agent into a high-speed mixing stirrer, and stirring for 1.5 hours at 70 ℃ to obtain a premix a;
and S3, cooling the premix a to room temperature, taking out the mixture, adding the mixture into a screw extruder, carrying out melt extrusion, tabletting, cooling to 25 ℃, carrying out fine crushing, and sieving with a 200-mesh sieve to obtain the polyester transparent powder coating.
Comparative example 3
The polyester transparent powder coating comprises the following raw materials: 70kg of polyester resin, 2kg of diethanolamine, 5kg of methyl acrylate, 3kg of trimethylolpropane, 4kg of catalyst, 0.5kg of stearic acid, 3kg of curing agent, 1.5kg of dispersing agent, 1.5kg of flatting agent, 1.6kg of light stabilizer and 3kg of defoaming agent.
The preparation method of the polyester transparent powder coating comprises the following steps:
s1, adding the polyester resin, the curing agent, the dispersing agent, the flatting agent, the light stabilizer and the defoaming agent into a high-speed mixing stirrer, and stirring for 1.5 hours at 70 ℃ to obtain premix a;
s2, adding diethanolamine into 30kg of methanol, stirring uniformly, adding methyl acrylate, stirring at 45 ℃ for 3h, carrying out vacuum filtration, adding into trimethylolpropane, stirring at 55 ℃ for 1.5h, adding a catalyst, stirring at 110 ℃ for 1.5h, adding a rotary evaporator, carrying out rotary evaporation at 135 ℃ under the pressure of 0.03MPa for 1.5h, adding stearic acid, and continuing to carry out rotary evaporation for 1.5h to obtain a premix b;
and S3, adding the premix b into the premix a, continuously stirring for 15min, cooling to room temperature, taking out the mixture, adding the mixture into a screw extruder, carrying out melt extrusion, tabletting, cooling to 25 ℃, carrying out fine crushing, and sieving with a 200-mesh sieve to obtain the polyester transparent powder coating.
Test examples
The polyester transparent powder coatings obtained in example 5 and comparative examples 2 to 3, and the polyester transparent powder coating used in comparative example 1 were compared, and each group of test specimens was sprayed on the surface of a 0.8mm thick degreasing and rust removing cold-rolled steel sheet to a film thickness of 50 to 80 μm to form a final coating for performance evaluation:
according to GB/T21782.8-2008 part 8 of powder coating: evaluation of storage stability of thermosetting powder the powder coatings were tested for caking (40 ℃ C.. times.24 h);
visually observing the appearance and transparency of the coating;
according to GB/T6739-2006 color paints and varnishes: the hardness of the coating is tested by a pencil method for determining the hardness of the paint film;
testing the adhesion of the coating according to GB/T1720-containing 1979 paint film adhesion determination method;
xenon lamp aging is carried out for 2000h according to GB/T1865-2009 artificial weathering aging and artificial radiation exposure of colored paint and varnish to test the light-preserving rate;
testing for 240h by using GM4476P-1997 copper accelerated acetic acid corrosion salt spray test (CASS test);
the water resistance performance is tested for 1000h by GB/T1733 + 1993 'determination method for water resistance of paint film'.
The results are as follows:
from the above table it can be seen that: the coating prepared from the polyester transparent powder coating has high leveling property, high transparency, high hardness, high weather resistance and high corrosion resistance, can be well attached to the surface of a metal substrate without falling off, and can meet the coating requirements of good attractiveness and durability of a metal surface coating.
Compared example 1 and comparative example 2 do not adopt premix b, so that the coating film has low transparency and adhesion, insufficient compactness and high curing temperature; whereas, the group of comparative example 3 did not use a premixed filler, so that the transparency and hardness were slightly insufficient.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. The polyester transparent powder coating is characterized by comprising the following raw materials: polyester resin, diethanol amine, methyl acrylate, trimethylolpropane, a catalyst, stearic acid, barium sulfate, calcium carbonate, silicon dioxide, graphene, a curing agent, a dispersing agent, a flatting agent, a light stabilizer and a defoaming agent; the mass ratio of the polyester resin, diethanol amine, methyl acrylate, trimethylolpropane, catalyst, stearic acid, barium sulfate, calcium carbonate, silicon dioxide, graphene, curing agent, dispersing agent, flatting agent, light stabilizer and defoaming agent is 40-100: 1-3: 3-8: 1-5: 2-6: 0.1-1: 5-10: 1-5: 5-15: 1-3: 1-5: 1-2: 1-2: 1-2: 1-5;
the polyester transparent powder coating is prepared by the following method:
s1, mixing barium sulfate, calcium carbonate, silicon dioxide and graphene, and stirring at 100-150 ℃ for 5-15min to obtain a premixed filler;
s2, mixing the polyester resin, the premixed filler, the curing agent, the dispersing agent, the flatting agent, the light stabilizer and the defoaming agent, and stirring for 1-2 hours at 65-75 ℃ to obtain the premixa；
S3, adding diethanolamine into methanol, stirring uniformly, adding methyl acrylate, stirring at 40-50 ℃ for 2-4h, vacuum filtering, adding into trimethylolpropane, stirring at 50-60 ℃ for 1-2h, adding acidic catalyst, 100-120 DEG CStirring for 1-2h, rotary evaporating for 1-2h, adding stearic acid, and further rotary evaporating for 1-2h to obtain premixb(ii) a The diethanolamine is combined with methyl acrylate, and then reacts with trimethylolpropane under the action of an acid catalyst to form a hydroxyl-terminated hyperbranched polymer;
s4 premixaAdding premixbAnd continuously stirring for 10-20min, cooling to room temperature, taking out the mixture, performing melt extrusion, tabletting, cooling, finely crushing, and sieving to obtain the polyester transparent powder coating.
2. The polyester transparent powder coating of claim 1, wherein the acidic catalyst is at least one of concentrated sulfuric acid, concentrated hydrochloric acid, and p-toluenesulfonic acid.
3. The polyester transparent powder coating of claim 1, wherein the curing agent is an isocyanate or an amino resin.
4. The transparent polyester powder coating of claim 1, wherein the dispersant is at least one of glyceryl monostearate, glyceryl tristearate, zinc stearate, and polyethylene glycol 200.
5. The polyester transparent powder coating according to claim 1, wherein the leveling agent is an organosilicon modified acrylate polymer or polyvinyl butyral.
6. The polyester transparent powder coating of claim 1, wherein the light stabilizer is a hindered amine light stabilizer.
7. The polyester transparent powder coating according to claim 1, wherein the defoaming agent is silicone emulsion.
8. The transparent polyester powder coating as claimed in claim 1, wherein the rotary evaporation temperature of S3 is 130-140 ℃ and the rotary evaporation pressure is 0.02-0.04 MPa.
9. The polyester transparent powder coating according to claim 1, wherein the mesh number of the screen in S4 is 200 meshes.
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|---|---|---|---|---|
| EP1070748A1 (en) * | 1999-07-20 | 2001-01-24 | E.I. Du Pont De Nemours And Company | Powder coating compositions, their preparation and use |
| CN106609098A (en) * | 2016-12-01 | 2017-05-03 | 天长市金陵电子有限责任公司 | Super-weather-resistance powder coating for electrostatic spraying and preparation method thereof |
| CN106752757A (en) * | 2016-11-18 | 2017-05-31 | 宁波天华邦粉末涂料有限公司 | Corrosion-resistant pure polyester powdery paints and preparation method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1070748A1 (en) * | 1999-07-20 | 2001-01-24 | E.I. Du Pont De Nemours And Company | Powder coating compositions, their preparation and use |
| CN106752757A (en) * | 2016-11-18 | 2017-05-31 | 宁波天华邦粉末涂料有限公司 | Corrosion-resistant pure polyester powdery paints and preparation method |
| CN106609098A (en) * | 2016-12-01 | 2017-05-03 | 天长市金陵电子有限责任公司 | Super-weather-resistance powder coating for electrostatic spraying and preparation method thereof |
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