CN113667386A - Powder coating with two coating layers and one baking layer and preparation method thereof - Google Patents
Powder coating with two coating layers and one baking layer and preparation method thereof Download PDFInfo
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- CN113667386A CN113667386A CN202111091857.5A CN202111091857A CN113667386A CN 113667386 A CN113667386 A CN 113667386A CN 202111091857 A CN202111091857 A CN 202111091857A CN 113667386 A CN113667386 A CN 113667386A
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- 238000000576 coating method Methods 0.000 title claims abstract description 151
- 239000011248 coating agent Substances 0.000 title claims abstract description 148
- 239000000843 powder Substances 0.000 title claims abstract description 119
- 239000010410 layer Substances 0.000 title claims description 43
- 239000011247 coating layer Substances 0.000 title claims description 3
- 238000002360 preparation method Methods 0.000 title description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 53
- 239000004645 polyester resin Substances 0.000 claims abstract description 39
- 229920001225 polyester resin Polymers 0.000 claims abstract description 39
- 239000000945 filler Substances 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 17
- 239000000049 pigment Substances 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 239000003822 epoxy resin Substances 0.000 claims abstract description 15
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 15
- 239000000440 bentonite Substances 0.000 claims abstract description 13
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 13
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910021485 fumed silica Inorganic materials 0.000 claims abstract description 13
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 3
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 3
- 238000007872 degassing Methods 0.000 claims description 22
- 239000002344 surface layer Substances 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 17
- OUPZKGBUJRBPGC-UHFFFAOYSA-N 1,3,5-tris(oxiran-2-ylmethyl)-1,3,5-triazinane-2,4,6-trione Chemical compound O=C1N(CC2OC2)C(=O)N(CC2OC2)C(=O)N1CC1CO1 OUPZKGBUJRBPGC-UHFFFAOYSA-N 0.000 claims description 16
- 238000001125 extrusion Methods 0.000 claims description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 7
- 238000007873 sieving Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 5
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 claims description 5
- 229910000165 zinc phosphate Inorganic materials 0.000 claims description 3
- 229910000611 Zinc aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 2
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 30
- 239000006229 carbon black Substances 0.000 description 16
- 239000004408 titanium dioxide Substances 0.000 description 15
- 229910052788 barium Inorganic materials 0.000 description 9
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 238000010276 construction Methods 0.000 description 5
- 238000000227 grinding Methods 0.000 description 5
- 239000003973 paint Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 239000004593 Epoxy Substances 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 238000009472 formulation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- NRCMAYZCPIVABH-UHFFFAOYSA-N Quinacridone Chemical compound N1C2=CC=CC=C2C(=O)C2=C1C=C1C(=O)C3=CC=CC=C3NC1=C2 NRCMAYZCPIVABH-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- ISAOCJYIOMOJEB-UHFFFAOYSA-N benzoin Chemical compound C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 ISAOCJYIOMOJEB-UHFFFAOYSA-N 0.000 description 2
- -1 bismuth vanadate series Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- FYNROBRQIVCIQF-UHFFFAOYSA-N pyrrolo[3,2-b]pyrrole-5,6-dione Chemical compound C1=CN=C2C(=O)C(=O)N=C21 FYNROBRQIVCIQF-UHFFFAOYSA-N 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- ALKYHXVLJMQRLQ-UHFFFAOYSA-N 3-Hydroxy-2-naphthoate Chemical compound C1=CC=C2C=C(O)C(C(=O)O)=CC2=C1 ALKYHXVLJMQRLQ-UHFFFAOYSA-N 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 244000028419 Styrax benzoin Species 0.000 description 1
- 235000000126 Styrax benzoin Nutrition 0.000 description 1
- 235000008411 Sumatra benzointree Nutrition 0.000 description 1
- IRERQBUNZFJFGC-UHFFFAOYSA-L azure blue Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[S-]S[S-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-] IRERQBUNZFJFGC-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229960002130 benzoin Drugs 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 235000019382 gum benzoic Nutrition 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- PXZQEOJJUGGUIB-UHFFFAOYSA-N isoindolin-1-one Chemical compound C1=CC=C2C(=O)NCC2=C1 PXZQEOJJUGGUIB-UHFFFAOYSA-N 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- 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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- 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
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
-
- 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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a two-coating one-baking powder coating, which comprises a bottom layer powder coating and a top layer powder coating, wherein the bottom layer powder coating comprises the following raw materials in percentage by weight: 30-40% of polyester resin, 30-40% of epoxy resin, 10-20% of pigment, 15-25% of anticorrosive filler, 0.2-0.5% of bentonite and 1-5% of auxiliary agent; and nano silicon oxide accounting for 2-4 per mill of the total weight of the raw materials; the surface powder coating comprises the following raw materials: polyester resin, a curing agent, pigment, filler, degassed wax, an auxiliary agent and fumed silica accounting for 2-4 per mill of the total weight of the polyester resin, the curing agent, the pigment, the filler, the degassed wax and the auxiliary agent; it does not contain VOC, and is green and environment-friendly; the coating can be constructed by adopting a two-coating one-baking process, the obtained coating has high corner coverage rate and good corrosion resistance, the sprayed product has long service life, the surface of the coating is smooth, the glossiness is high, and the product has good appearance.
Description
Technical Field
The invention belongs to the technical field of powder coatings, and particularly relates to a powder coating with two coatings and one baking and a preparation method thereof.
Background
The paint has a mature two-coating one-baking process during construction, but the paint belongs to flammable and explosive products, a solvent is volatilized in the using process, the environment is polluted, meanwhile, the physical health of constructors is damaged, the production efficiency of the paint is low, and the paint cannot be recycled.
The powder coating has a mature two-coating and two-baking process during construction, namely two-time spraying and two-time baking, so that the energy consumption is high and the production efficiency is low.
Disclosure of Invention
In order to solve the technical problems, the invention provides a two-coating one-baking powder coating which can be constructed by adopting a two-coating one-baking process, does not contain VOC, is simple to construct and is green and environment-friendly.
The technical scheme adopted by the invention is as follows:
the two-coating one-baking powder coating comprises a bottom layer powder coating and a top layer powder coating, wherein the bottom layer powder coating comprises the following raw materials in percentage by weight: 30-40% of polyester resin, 30-40% of epoxy resin, 10-20% of pigment, 15-25% of anticorrosive filler, 0.2-0.5% of bentonite and 1-5% of auxiliary agent; and nano silicon oxide accounting for 2-4 per mill of the total weight of the polyester resin, the epoxy resin, the pigment, the anticorrosive filler, the bentonite and the auxiliary agent.
The surface powder coating comprises the following raw materials in percentage by weight: 60-65% of polyester resin, 4-5% of curing agent, 8-18% of pigment, 15-25% of filler, 1-2% of degassed wax and 1-5% of auxiliary agent; and fumed silica which accounts for 2-4 per mill of the total weight of the polyester resin, the curing agent, the pigment, the filler, the degassed wax and the auxiliary agent.
The polyester resin in the bottom powder coating is mixed epoxy curing polyester resin.
The polyester resin in the surface layer powder coating is outdoor TGIC curing polyester resin.
The auxiliary agents in the bottom layer powder coating and the surface layer powder coating are any one or more of degassing agent and flatting agent.
The pigment in the bottom layer powder coating and the surface layer powder coating is any one or more of titanium dioxide, carbon black, phthalocyanine green, phthalocyanine blue, ultramarine, iron oxide red, iron oxide yellow, isoindolinone and bismuth vanadate series yellow, Diketopyrrolopyrrole (DPP), quinacridone (di) ketone and beta-hydroxynaphthoic acid red.
The anticorrosive filler in the bottom layer powder coating is any one or more of zinc phosphate, modified zinc phosphate and aluminum tripolyphosphate.
The curing agent in the surface layer powder coating is TGIC curing agent.
The filler in the surface layer powder coating is any one or more of high-light barium and precipitated barium.
The invention also provides a preparation method of the two-coating one-baking powder coating, which comprises the following steps:
(1) uniformly mixing polyester resin, epoxy resin, pigment, anticorrosive filler, bentonite and an auxiliary agent according to the formula amount, then carrying out melt extrusion, crushing extruded materials after tabletting, crushing crushed tablets by a mill, adding nano-alumina according to the formula amount in the crushing process, and sieving to obtain a bottom layer powder coating, wherein the average particle size of the bottom layer powder coating is controlled to be 30-40 micrometers;
(2) uniformly mixing the polyester resin, the curing agent, the pigment, the filler, the degassed wax and the auxiliary agent according to the formula amount, then carrying out melt extrusion, crushing the extruded material after tabletting, crushing the crushed material sheet by a mill, adding the fumed silica according to the formula amount in the crushing process, and sieving to obtain the surface layer powder coating, wherein the average particle size is controlled to be 30-40 micrometers.
In the step (1) and the step (2), the melt extrusion conditions are as follows: the temperature of the feeding section is 25-35 ℃, the temperature of the melting section is 105-115 ℃, and the temperature of the discharging section is 95-105 ℃; preferably, the temperature of the feeding section is 30 ℃, the temperature of the melting section is 110 ℃, and the temperature of the discharging section is 100 ℃.
The invention also provides a coating formed by the two-coating one-baking powder coating, the coating has high corner coverage rate and good corrosion resistance, the sprayed product has long service life, the surface of the coating is smooth, the glossiness is high, the appearance effect of the product is better, and the coating can be applied to the fields of engineering machinery and the like.
The construction method of the two-coating one-baking powder coating comprises the following steps: pre-treating a substrate → spraying a bottom powder coating → spraying a surface powder coating → curing.
The substrate pretreatment mode comprises the following steps: chemical treatment means or physical treatment means.
The chemical treatment mode comprises a phosphorization treatment or a treatment using silane.
The physical treatment mode comprises sand blasting, shot blasting or grinding treatment.
The curing conditions are as follows: keeping the temperature at 160-220 ℃ for 15-20 min, preferably keeping the temperature at 200 ℃ for 15 min. Due to the differences of the structure, the size, the wall thickness and the like of the construction workpiece, the curing temperature needs to be adjusted in the range according to specific conditions on site to ensure that the coating is completely cured, but the minimum temperature is not lower than 160 ℃, and the maximum temperature is not higher than 220 ℃.
According to the invention, bentonite is added in the formula of the bottom powder coating of the two-coating one-baking powder coating, so that the viscosity of the bottom powder coating is increased, and the possibility of the bottom powder coating migrating to a surface layer can be effectively reduced in the final curing process; the corner coverage rate is improved, and the service life of the product is prolonged by matching with the addition of the anticorrosive filler in the formula; and when the bottom layer powder coating is prepared, the nano aluminum oxide is added in the process of crushing the material sheet to improve the electrification performance of the bottom powder and improve the powder loading amount when the surface layer powder coating is sprayed.
According to the formula of the surface layer powder coating with two-coating one-baking powder coating, the degassing wax is added to reduce the viscosity of the surface layer powder coating, so that degassing of the bottom layer powder coating during final curing is facilitated, a viscosity difference is formed between the bottom layer powder coating and the bottom layer powder coating, the bottom layer powder coating is prevented from migrating into the surface layer powder coating during curing, and the appearance of the coating is improved; when the surface powder coating is prepared, the fumed silica is added in the process of crushing the sheet, and the fumed silica and the degassed wax in the formula of the surface powder coating generate a synergistic effect to reduce the electrification of the surface powder coating, so that a potential difference is formed between the surface powder coating and the bottom powder coating, and the surface powder coating is effectively powdered.
Compared with the prior art, the two-coating one-baking powder coating provided by the invention has the following advantages:
(1) compared with paint, the powder coating does not contain VOC, and belongs to green environment-friendly coating
(2) The surface powder can be directly sprayed after the bottom powder is sprayed, so that the pre-curing link after the bottom powder is sprayed is omitted, and energy conservation and consumption reduction are realized;
(3) the coating formed by the construction of the two-coating one-baking process has high corner coverage rate and good corrosion resistance, and the sprayed product has long service life, smooth surface, high glossiness and better appearance effect, and can be applied to the fields of engineering machinery and the like;
(4) can be recycled and has high utilization rate.
Detailed Description
The present invention will be described in detail with reference to examples.
The anticorrosive fillers, leveling agents and degassing agents used in the examples and comparative examples are zinc phosphate, acrylic ester and benzoin respectively.
The mixed epoxy curing polyester resin is purchased from Anhui Shenjian New Material GmbH; outdoor TGIC cured polyester resin was purchased from Anhuishen Sword New materials GmbH; the epoxy resin is E-12; other respective starting materials are commercially available unless otherwise specified.
Example 1
The two-coating one-baking powder coating comprises a bottom layer powder coating and a top layer powder coating, wherein the bottom layer powder coating comprises the following raw materials in percentage by weight: 33% of mixed epoxy curing polyester resin, 33% of epoxy resin, 15% of titanium dioxide, 0.1% of carbon black, 17% of anticorrosive filler, 0.4% of bentonite, 1% of leveling agent and 0.5% of degassing agent; and nano alumina accounting for 3 per mill of the total weight of the polyester resin, the epoxy resin, the titanium dioxide, the carbon black, the anticorrosive filler, the bentonite, the flatting agent and the degassing agent;
the surface powder coating comprises the following raw materials in percentage by weight: 60% of outdoor TGIC curing polyester resin, 4.5% of TGIC curing agent, 15% of titanium dioxide, 0.1% of carbon black, 18% of high-light barium, 1% of degassed wax, 1% of leveling agent and 0.4% of degassing agent; and fumed silica which accounts for 3 per mill of the total weight of the polyester resin, the TGIC curing agent, the titanium dioxide, the carbon black, the high-light barium, the degassing wax, the flatting agent and the degassing agent.
The preparation method of the bottom layer powder coating comprises the following steps: adding polyester resin, epoxy resin, titanium dioxide, carbon black, anticorrosive filler, bentonite, a leveling agent and a degassing agent according to the formula ratio, fully mixing on a mixer, and then performing melt extrusion through an extruder, wherein the melt extrusion conditions are as follows: the temperature of the feeding section is 30 ℃, the temperature of the melting section is 110 ℃, and the temperature of the discharging section is 100 ℃; and tabletting the extruded material, crushing, grinding the crushed material sheet by a mill, adding nano alumina with the formula amount in the crushing process, and sieving to obtain the bottom layer powder coating, wherein the average particle size of the bottom layer powder coating is controlled to be 30-40 micrometers.
The preparation method of the surface powder coating comprises the following steps: adding polyester resin, TGIC curing agent, titanium dioxide, carbon black, high light barium, degassing wax, flatting agent and degassing agent according to the formula ratio, fully mixing on a mixer, and then performing melt extrusion through an extruder, wherein the melt extrusion conditions are as follows: the temperature of the feeding section is 30 ℃, the temperature of the melting section is 110 ℃, and the temperature of the discharging section is 100 ℃; and tabletting the extruded material, crushing, grinding the crushed material sheet by a grinding machine, adding the fumed silica with the formula amount in the crushing process, and sieving to obtain the surface layer powder coating, wherein the average particle size of the surface layer powder coating is controlled to be 30-40 micrometers.
Comparative example 1
The two-coating one-baking powder coating comprises a bottom layer powder coating and a top layer powder coating, wherein the bottom layer powder coating comprises the following raw materials in percentage by weight: 33.2 percent of mixed epoxy curing polyester resin, 33.2 percent of epoxy resin, 15 percent of titanium dioxide, 0.1 percent of carbon black, 17 percent of anticorrosive filler, 1 percent of flatting agent and 0.5 percent of degassing agent; and nano aluminum oxide accounting for 3 per mill of the total weight of the polyester resin, the epoxy resin, the titanium dioxide, the carbon black, the anticorrosive filler, the leveling agent and the degassing agent; the formulation and preparation method of the finish powder coating are the same as in example 1.
The preparation method of the bottom layer powder coating comprises the following steps: adding the polyester resin, the epoxy resin, the titanium dioxide, the carbon black, the anticorrosive filler, the leveling agent and the degassing agent according to the formula ratio, fully mixing on a mixer, and then performing melt extrusion through an extruder, wherein the melt extrusion conditions are as follows: the temperature of the feeding section is 30 ℃, the temperature of the melting section is 110 ℃, and the temperature of the discharging section is 100 ℃; and tabletting the extruded material, crushing, grinding the crushed material sheet by a mill, adding nano alumina with the formula amount in the crushing process, and sieving to obtain the bottom layer powder coating, wherein the average particle size of the bottom layer powder coating is controlled to be 30-40 micrometers.
Comparative example 2
The rest is the same as the example 1, except that the formulation of the bottom layer powder coating does not contain 3 per mill of nano alumina of the total weight of polyester resin, epoxy resin, titanium dioxide, carbon black, anticorrosive filler, bentonite, flatting agent and degassing agent; the formula of the surface powder coating does not contain fumed silica which accounts for 3 per mill of the total weight of polyester resin, TGIC curing agent, titanium dioxide, carbon black, high-light barium, degassed wax, flatting agent and degassing agent.
Comparative example 3
The rest is the same as the example 1, except that the surface layer powder coating comprises the following raw materials in percentage by weight: 60% of outdoor TGIC curing polyester resin, 4.5% of TGIC curing agent, 15% of titanium dioxide, 0.1% of carbon black, 19% of high-light barium, 1% of leveling agent, 0.4% of degassing agent and 3 per mill of fumed silica of the total weight of the raw materials.
Comparative example 4
The rest is the same as the example 1, except that the surface layer powder coating comprises the following raw materials in percentage by weight: 50% of outdoor TGIC curing polyester resin, 3.8% of TGIC curing agent, 15% of titanium dioxide, 0.1% of carbon black, 28.7% of high-light barium, 1% of degassed wax, 1% of flatting agent, 0.4% of degassing agent and fumed silica accounting for 3 per mill of the total weight of the raw materials.
Comparative example 5
The rest is the same as the example 1, except that the surface layer powder coating comprises the following raw materials in percentage by weight: 70 percent of outdoor TGIC curing polyester resin, 5.3 percent of TGIC curing agent, 15 percent of titanium dioxide, 0.1 percent of carbon black, 7.2 percent of high-light barium, 1 percent of degassed wax, 1 percent of flatting agent, 0.4 percent of degasifying agent and 3 per mill of fumed silica of the total weight of the raw materials.
The powder coatings in example 1 and comparative examples 1-5 were applied to the surface of a steel plate of 150mm × 75mm by the following method, respectively, of polishing the steel plate → spraying the powder coating for the bottom layer → spraying the powder coating for the top layer → curing at 200 ℃ for 15min, the amounts of the powder coating for the bottom layer and the powder coating for the top layer being 10g and 15g, respectively; the properties of the resulting coating are shown in table 1.
TABLE 1
It can be seen from table 1 that the bentonite is added in the formulation of the bottom powder coating, so that the viscosity of the bottom powder coating is increased, the corner coverage rate is improved, the corrosion of the corners is slowed down, and the service life of the product is prolonged. When the bottom layer powder coating is prepared, the nano aluminum oxide is added in the process of crushing the material sheet, and meanwhile, when the surface layer powder coating is prepared, the gas-phase white carbon black is added in the process of crushing the material sheet, so that the thickness of the coating can be improved, and the gloss and corner coverage rate of a sample plate are improved. The addition of the degassing wax in the formula of the surface layer powder coating can reduce the viscosity of the surface layer coating, is beneficial to degassing of the bottom layer powder coating during final curing, and simultaneously forms a viscosity difference with the bottom layer coating to prevent the bottom layer powder coating from migrating into the surface layer powder coating during curing, thereby improving the gloss of the coating. The polyester content in the flour exceeds the recommended range, and certain influence is exerted on the appearance and the corner coverage rate of a coating film.
The above detailed description of a two-coat one-bake powder coating and the method of making the same, with reference to the examples, is illustrative and not restrictive, and several examples are set forth with the limits of the invention, so that variations and modifications may be made without departing from the general inventive concept and, therefore, fall within the scope of the invention.
Claims (10)
1. The powder coating with two coating layers and one baking layer is characterized by comprising a bottom layer powder coating and a top layer powder coating, wherein the bottom layer powder coating comprises the following raw materials in percentage by weight: 30-40% of polyester resin, 30-40% of epoxy resin, 10-20% of pigment, 15-25% of anticorrosive filler, 0.2-0.5% of bentonite and 1-5% of auxiliary agent; and nano silicon oxide accounting for 2-4 per mill of the total weight of the polyester resin, the epoxy resin, the pigment, the anticorrosive filler, the bentonite and the auxiliary agent.
2. The two-coat one-bake powder coating of claim 1, wherein the top powder coating comprises the following raw materials in weight percent: 60-65% of polyester resin, 4-5% of curing agent, 8-18% of pigment, 15-25% of filler, 1-2% of degassed wax and 1-5% of auxiliary agent; and fumed silica which accounts for 2-4 per mill of the total weight of the polyester resin, the curing agent, the pigment, the filler, the degassed wax and the auxiliary agent.
3. The two-coat one-bake powder coating of claim 1, wherein the polyester resin in the primer powder coating is a hybrid epoxy-curing polyester resin.
4. The two-coat one-bake powder coating of claim 1 or 2, wherein the polyester resin in the top coat powder coating is an outdoor type TGIC cured polyester resin.
5. The two-coating one-baking powder coating according to claim 1 or 2, wherein the auxiliary agent in the bottom layer powder coating and the top layer coating is any one or more of a degassing agent and a leveling agent.
6. A two-coat one-bake powder coating according to claim 1 or 2, wherein the anti-corrosive filler in the primer powder coating is any one or more of zinc phosphate, modified zinc phosphate, and aluminum tripolyphosphate.
7. A two-coat one-bake powder coating according to claim 1 or 2, wherein the curing agent in the top coat powder coating is TGIC curing agent.
8. A method of preparing a two-coat one-bake powder coating according to any of claims 1-7, comprising the steps of:
(1) uniformly mixing polyester resin, epoxy resin, pigment, anticorrosive filler, bentonite and an auxiliary agent according to the formula amount, then carrying out melt extrusion, crushing extruded materials after tabletting, crushing crushed tablets by a mill, adding nano-alumina according to the formula amount in the crushing process, and sieving to obtain a bottom layer powder coating;
(2) uniformly mixing the polyester resin, the curing agent, the pigment, the filler, the degassed wax and the auxiliary agent according to the formula amount, then carrying out melt extrusion, crushing the extruded material after tabletting, crushing the crushed material sheet by a mill, adding the fumed silica according to the formula amount in the crushing process, and sieving to obtain the surface layer powder coating.
9. A method of preparing a two-coat one-bake powder coating according to claim 8, wherein in steps (1) and (2), the melt extrusion conditions are: the temperature of the feeding section is 25-35 ℃, the temperature of the melting section is 105-115 ℃, and the temperature of the discharging section is 95-105 ℃.
10. A coating formed from the two-coat one-bake powder coating of any one of claims 1-7.
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