CN117903677A - Water-based environment-friendly PVDF fluorocarbon coating and production process thereof - Google Patents
Water-based environment-friendly PVDF fluorocarbon coating and production process thereof Download PDFInfo
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- CN117903677A CN117903677A CN202410088652.9A CN202410088652A CN117903677A CN 117903677 A CN117903677 A CN 117903677A CN 202410088652 A CN202410088652 A CN 202410088652A CN 117903677 A CN117903677 A CN 117903677A
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- 238000000576 coating method Methods 0.000 title claims abstract description 86
- 239000011248 coating agent Substances 0.000 title claims abstract description 79
- 239000002033 PVDF binder Substances 0.000 title claims abstract description 44
- 229920002981 polyvinylidene fluoride Polymers 0.000 title claims abstract description 44
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract description 13
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims abstract description 54
- 239000003973 paint Substances 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims description 116
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 44
- 239000002131 composite material Substances 0.000 claims description 44
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 36
- 239000002245 particle Substances 0.000 claims description 32
- 238000007873 sieving Methods 0.000 claims description 31
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 30
- 238000002156 mixing Methods 0.000 claims description 24
- 229920000178 Acrylic resin Polymers 0.000 claims description 19
- 239000004925 Acrylic resin Substances 0.000 claims description 19
- 239000002318 adhesion promoter Substances 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 18
- 239000001023 inorganic pigment Substances 0.000 claims description 18
- 229920001169 thermoplastic Polymers 0.000 claims description 18
- 239000004416 thermosoftening plastic Substances 0.000 claims description 18
- 239000002518 antifoaming agent Substances 0.000 claims description 15
- 239000004408 titanium dioxide Substances 0.000 claims description 14
- 239000011812 mixed powder Substances 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 7
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 6
- 239000004615 ingredient Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000013530 defoamer Substances 0.000 claims description 3
- 239000001038 titanium pigment Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 13
- 230000007613 environmental effect Effects 0.000 abstract description 6
- 230000008929 regeneration Effects 0.000 abstract description 3
- 238000011069 regeneration method Methods 0.000 abstract description 3
- 235000010215 titanium dioxide Nutrition 0.000 description 13
- 238000005452 bending Methods 0.000 description 6
- 239000011521 glass Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- -1 polytetrafluoroethylene Polymers 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 2
- 239000002932 luster Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229920001780 ECTFE Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007590 electrostatic spraying Methods 0.000 description 1
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000000630 rising 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to the technical field of water-based paint, in particular to a water-based environment-friendly PVDF fluorocarbon paint and a production process thereof. Therefore, the thermoplastic polyurethane resin has a great improvement effect on improving the flexibility of the coating, and the improvement on the flexibility also has a great improvement effect on the performance of the whole coating, so that the durability of the PVDF fluorocarbon coating is improved, and the PVDF fluorocarbon coating accords with the characteristics of regeneration and environmental protection.
Description
Technical Field
The invention relates to the technical field of water-based paint, in particular to a water-based environment-friendly PVDF fluorocarbon paint and a production process thereof.
Background
Polyvinylidene fluoride (PVDF) coatings are successfully applied to the construction industry and coated on decorative plates, and fluorocarbon coatings on the market at present mainly comprise polytetrafluoroethylene coatings, polyvinylidene fluoride coatings, fluoroolefin and alkyl vinyl ether or ester copolymer coatings, ethylene-tetrafluoroethylene copolymer coatings, ethylene-chlorotrifluoroethylene copolymer coatings and the like. Along with technological progress and high-speed development of national economy, the enhancement of environmental protection consciousness and the stricter environmental protection policy of people become more and more, and environmental protection type green paint becomes a development trend, and the traditional fluorocarbon paint is also developing towards water-based and powder paint.
However, in the prior art, the PVDF resin has extremely strong flexibility, so the PVDF resin has larger limitation in the production process, is difficult to be widely applied to the industry, has darker overall color and luster and uneven color distribution of the existing PVDF fluorocarbon coating, and has fine cracks after bending the plate coated with the PVDF fluorocarbon coating.
Disclosure of Invention
Aiming at the defects of the prior art, the invention solves the technical problems by adopting the following technical scheme: the water-based environment-friendly PVDF fluorocarbon coating comprises thermoplastic polyurethane resin, thermoplastic acrylic resin, titanium white, barium sulfate, a leveling agent, a defoaming agent, an adhesion promoter and an inorganic pigment, wherein the components are as follows in parts by weight: 70-75 parts of thermoplastic polyurethane resin, 10-15 parts of thermoplastic acrylic resin, 3-5 parts of titanium dioxide, 5-8 parts of barium sulfate, 1-2 parts of flatting agent, 1-2 parts of defoamer, 1-2 parts of adhesion promoter and 1-2 parts of inorganic pigment.
A production process of an aqueous environment-friendly PVDF fluorocarbon coating comprises the following steps:
step one, preparing production equipment: the production equipment comprises a double-screw extruder, a pulverizer, a bonding machine and a fine powder vibrating screen;
Step two, preparing acrylic composite powder: uniformly mixing thermoplastic acrylic resin, titanium dioxide, barium sulfate, a flatting agent, a defoaming agent, an adhesion promoter and an inorganic pigment, and crushing in a crusher;
Step three, sieving: mixing the raw materials of each component by using a double-screw extruder, extruding the raw materials into tablets, crushing the tablets by using a crusher, and sieving the crushed tablets by using a fine powder vibrating screen to obtain single-component acrylic acid composite powder;
Step four, bonding: sieving thermoplastic polyurethane resin powder by using a fine powder vibrating screen, mixing the sieved thermoplastic polyurethane resin powder with the acrylic composite powder prepared in the step three, and adding the mixture into a bonding machine for bonding;
Step five, secondary sieving: sieving the mixed powder after the fourth bonding step to prepare the required powder coating, thereby ensuring the uniform particle size distribution of the coating, avoiding the conditions of particle blockage and uneven particle size, and further ensuring the quality and coating effect of the coating;
The invention is further provided that in the second step, the ingredients of the acrylic composite powder are 48% of thermoplastic acrylic resin, 24.8% of barium sulfate, 16.4% of titanium dioxide, 2.4% of flatting agent and 2.4% of defoaming agent; 2.8% of adhesion promoter and 3.2% of inorganic pigment, and the mixing time in a mixer is 10min.
The invention is further arranged that the mesh number of the fine powder vibrating screen is 180 meshes, and the aperture of the fine powder vibrating screen is 0.075mm during sieving in the third step.
The invention further provides that the bonding in the fourth step comprises the following specific processes: the mixed powder coating is heated by a bonding machine to enable powder coating particles to be changed into a high-elasticity state from a glass state, and then the thermoplastic polyurethane resin powder coating particles and the acrylic composite powder particles are bonded together by utilizing the cohesiveness of the high-elasticity state, wherein the internal temperature of the bonding machine is 65 ℃, the bonding rotating speed is 800rmp, the heating rotating speed is 1600rmp, and the bonding time is 800s.
The invention further provides that in the fourth step, when the thermoplastic polyurethane resin powder is mixed with the acrylic composite powder, the mass fraction of the thermoplastic polyurethane resin powder is 70% -75%, and the mass fraction of the acrylic composite powder is 25% -30%.
The beneficial effects of the invention are as follows:
1. according to the invention, the PVDF resin in the PVDF fluorocarbon coating component is replaced by the thermoplastic polyurethane resin, and the thermoplastic polyurethane resin and the acrylic composite powder are prepared according to a ratio of 7:3, so that the overall color of the PVDF fluorocarbon coating is improved, the color distribution is uniform, and no obvious effect of uneven color distribution is generated.
2. According to the PVDF fluorocarbon coating, the proportion of the thermoplastic polyurethane resin in the PVDF fluorocarbon coating is increased, and the bending performance of the coating is greatly improved from integral fracture to almost no fracture along with the improvement of the mass fraction of the thermoplastic polyurethane resin. Therefore, the thermoplastic polyurethane resin has a great improvement effect on improving the flexibility of the coating, and the improvement on the flexibility also has a great improvement effect on the performance of the whole coating, so that the durability of the PVDF fluorocarbon coating is improved, and the PVDF fluorocarbon coating accords with the characteristics of regeneration and environmental protection.
Drawings
FIG. 1 is a process flow diagram of an aqueous environmental-friendly PVDF fluorocarbon coating and a production process thereof;
FIG. 2 is a table showing the appearance, film thickness and bending of the aqueous environmental-friendly PVDF fluorocarbon coating prepared at different thermoplastic polyurethane resin mass fractions of the present invention.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description. The embodiments of the invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Embodiment one: referring to fig. 1-2, the present invention provides a technical solution: the water-based environment-friendly PVDF fluorocarbon coating comprises thermoplastic polyurethane resin, thermoplastic acrylic resin, titanium white, barium sulfate, a leveling agent, a defoaming agent, an adhesion promoter and an inorganic pigment, wherein the components are as follows in parts by weight: 70-75 parts of thermoplastic polyurethane resin, 10-15 parts of thermoplastic acrylic resin, 3-5 parts of titanium pigment, 5-8 parts of barium sulfate, 1-2 parts of flatting agent, 1-2 parts of defoamer, 1-2 parts of adhesion promoter and 1-2 parts of inorganic pigment, and the integral color and luster of the PVDF fluorocarbon coating are improved and the color distribution is uniform by replacing the original PVDF resin in the PVDF fluorocarbon coating component with the thermoplastic polyurethane resin and preparing the thermoplastic polyurethane resin and acrylic composite powder according to a ratio of 7:3.
Embodiment two: referring to fig. 1-2, the present invention provides a technical solution: on the basis of the first embodiment, the production process of the water-based environment-friendly PVDF fluorocarbon coating comprises the following steps:
step one, preparing production equipment: the production equipment comprises a double-screw extruder, a pulverizer, a bonding machine and a fine powder vibrating screen;
Step two, preparing acrylic composite powder: uniformly mixing thermoplastic acrylic resin, titanium dioxide, barium sulfate, a flatting agent, a defoaming agent, an adhesion promoter and an inorganic pigment, and crushing in a crusher;
In the second step, the ingredients of the acrylic composite powder are thermoplastic acrylic resin 48%, barium sulfate 24.8%, titanium dioxide 16.4%, flatting agent 2.4% and defoaming agent 2.4%; 2.8% of adhesion promoter and 3.2% of inorganic pigment, and the mixing time in a mixer is 10min.
Step three, sieving: mixing the raw materials of each component by using a double-screw extruder, extruding the raw materials into tablets, crushing the tablets by using a crusher, and sieving the crushed tablets by using a fine powder vibrating screen to obtain single-component acrylic acid composite powder;
further, in the third step, the mesh number of the fine powder vibrating screen is 180 meshes, and the aperture of the fine powder vibrating screen is 0.075mm.
Step four, bonding: sieving thermoplastic polyurethane resin powder by using a fine powder vibrating screen, mixing the sieved thermoplastic polyurethane resin powder with the acrylic composite powder prepared in the step three, and adding the mixture into a bonding machine for bonding;
further, the bonding in the fourth step comprises the following specific steps: the mixed powder coating is heated by a bonding machine to enable powder coating particles to be changed into a high-elasticity state from a glass state, and then the thermoplastic polyurethane resin powder coating particles and the acrylic composite powder particles are bonded together by utilizing the cohesiveness of the high-elasticity state, wherein the internal temperature of the bonding machine is 65 ℃, the bonding rotating speed is 800rmp, the heating rotating speed is 1600rmp, and the bonding time is 800s.
Further, in the fourth step, when the thermoplastic polyurethane resin powder is mixed with the acrylic composite powder, the mass fraction of the thermoplastic polyurethane resin powder is 45%, and the mass fraction of the acrylic composite powder is 55%.
Step five, secondary sieving: sieving the mixed powder after the fourth bonding step to prepare the required powder coating, thereby ensuring the uniform particle size distribution of the coating, avoiding the conditions of particle blockage and uneven particle size, and further ensuring the quality and coating effect of the coating;
embodiment III: referring to fig. 1-2, the present invention provides a technical solution: on the basis of the first embodiment, the production process of the water-based environment-friendly PVDF fluorocarbon coating comprises the following steps:
step one, preparing production equipment: the production equipment comprises a double-screw extruder, a pulverizer, a bonding machine and a fine powder vibrating screen;
Step two, preparing acrylic composite powder: uniformly mixing thermoplastic acrylic resin, titanium dioxide, barium sulfate, a flatting agent, a defoaming agent, an adhesion promoter and an inorganic pigment, and crushing in a crusher;
In the second step, the ingredients of the acrylic composite powder are thermoplastic acrylic resin 48%, barium sulfate 24.8%, titanium dioxide 16.4%, flatting agent 2.4% and defoaming agent 2.4%; 2.8% of adhesion promoter and 3.2% of inorganic pigment, and the mixing time in a mixer is 10min.
Step three, sieving: mixing the raw materials of each component by using a double-screw extruder, extruding the raw materials into tablets, crushing the tablets by using a crusher, and sieving the crushed tablets by using a fine powder vibrating screen to obtain single-component acrylic acid composite powder;
further, in the third step, the mesh number of the fine powder vibrating screen is 180 meshes, and the aperture of the fine powder vibrating screen is 0.075mm.
Step four, bonding: sieving thermoplastic polyurethane resin powder by using a fine powder vibrating screen, mixing the sieved thermoplastic polyurethane resin powder with the acrylic composite powder prepared in the step three, and adding the mixture into a bonding machine for bonding;
further, the bonding in the fourth step comprises the following specific steps: the mixed powder coating is heated by a bonding machine to enable powder coating particles to be changed into a high-elasticity state from a glass state, and then the thermoplastic polyurethane resin powder coating particles and the acrylic composite powder particles are bonded together by utilizing the cohesiveness of the high-elasticity state, wherein the internal temperature of the bonding machine is 65 ℃, the bonding rotating speed is 800rmp, the heating rotating speed is 1600rmp, and the bonding time is 800s.
Further, in the fourth step, when the thermoplastic polyurethane resin powder is mixed with the acrylic composite powder, the mass fraction of the thermoplastic polyurethane resin powder is 55%, and the mass fraction of the acrylic composite powder is 45%.
Step five, secondary sieving: sieving the mixed powder after the fourth bonding step to prepare the required powder coating, thereby ensuring the uniform particle size distribution of the coating, avoiding the conditions of particle blockage and uneven particle size, and further ensuring the quality and coating effect of the coating;
embodiment four: referring to fig. 1-2, the present invention provides a technical solution: on the basis of the first embodiment, the production process of the water-based environment-friendly PVDF fluorocarbon coating comprises the following steps:
step one, preparing production equipment: the production equipment comprises a double-screw extruder, a pulverizer, a bonding machine and a fine powder vibrating screen;
Step two, preparing acrylic composite powder: uniformly mixing thermoplastic acrylic resin, titanium dioxide, barium sulfate, a flatting agent, a defoaming agent, an adhesion promoter and an inorganic pigment, and crushing in a crusher;
In the second step, the ingredients of the acrylic composite powder are thermoplastic acrylic resin 48%, barium sulfate 24.8%, titanium dioxide 16.4%, flatting agent 2.4% and defoaming agent 2.4%; 2.8% of adhesion promoter and 3.2% of inorganic pigment, and the mixing time in a mixer is 10min.
Step three, sieving: mixing the raw materials of each component by using a double-screw extruder, extruding the raw materials into tablets, crushing the tablets by using a crusher, and sieving the crushed tablets by using a fine powder vibrating screen to obtain single-component acrylic acid composite powder;
further, in the third step, the mesh number of the fine powder vibrating screen is 180 meshes, and the aperture of the fine powder vibrating screen is 0.075mm.
Step four, bonding: sieving thermoplastic polyurethane resin powder by using a fine powder vibrating screen, mixing the sieved thermoplastic polyurethane resin powder with the acrylic composite powder prepared in the step three, and adding the mixture into a bonding machine for bonding;
further, the bonding in the fourth step comprises the following specific steps: the mixed powder coating is heated by a bonding machine to enable powder coating particles to be changed into a high-elasticity state from a glass state, and then the thermoplastic polyurethane resin powder coating particles and the acrylic composite powder particles are bonded together by utilizing the cohesiveness of the high-elasticity state, wherein the internal temperature of the bonding machine is 65 ℃, the bonding rotating speed is 800rmp, the heating rotating speed is 1600rmp, and the bonding time is 800s.
Further, in the fourth step, when the thermoplastic polyurethane resin powder is mixed with the acrylic composite powder, the mass fraction of the thermoplastic polyurethane resin powder is 65%, and the mass fraction of the acrylic composite powder is 35%.
Step five, secondary sieving: sieving the mixed powder after the fourth bonding step to prepare the required powder coating, thereby ensuring the uniform particle size distribution of the coating, avoiding the conditions of particle blockage and uneven particle size, and further ensuring the quality and coating effect of the coating;
fifth embodiment: referring to fig. 1-2, the present invention provides a technical solution: on the basis of the first embodiment, the production process of the water-based environment-friendly PVDF fluorocarbon coating comprises the following steps:
step one, preparing production equipment: the production equipment comprises a double-screw extruder, a pulverizer, a bonding machine and a fine powder vibrating screen;
Step two, preparing acrylic composite powder: uniformly mixing thermoplastic acrylic resin, titanium dioxide, barium sulfate, a flatting agent, a defoaming agent, an adhesion promoter and an inorganic pigment, and crushing in a crusher;
In the second step, the ingredients of the acrylic composite powder are thermoplastic acrylic resin 48%, barium sulfate 24.8%, titanium dioxide 16.4%, flatting agent 2.4% and defoaming agent 2.4%; 2.8% of adhesion promoter and 3.2% of inorganic pigment, and the mixing time in a mixer is 10min.
Step three, sieving: mixing the raw materials of each component by using a double-screw extruder, extruding the raw materials into tablets, crushing the tablets by using a crusher, and sieving the crushed tablets by using a fine powder vibrating screen to obtain single-component acrylic acid composite powder;
further, in the third step, the mesh number of the fine powder vibrating screen is 180 meshes, and the aperture of the fine powder vibrating screen is 0.075mm.
Step four, bonding: sieving thermoplastic polyurethane resin powder by using a fine powder vibrating screen, mixing the sieved thermoplastic polyurethane resin powder with the acrylic composite powder prepared in the step three, and adding the mixture into a bonding machine for bonding;
further, the bonding in the fourth step comprises the following specific steps: the mixed powder coating is heated by a bonding machine to enable powder coating particles to be changed into a high-elasticity state from a glass state, and then the thermoplastic polyurethane resin powder coating particles and the acrylic composite powder particles are bonded together by utilizing the cohesiveness of the high-elasticity state, wherein the internal temperature of the bonding machine is 65 ℃, the bonding rotating speed is 800rmp, the heating rotating speed is 1600rmp, and the bonding time is 800s.
Further, in the fourth step, when the thermoplastic polyurethane resin powder is mixed with the acrylic composite powder, the mass fraction of the thermoplastic polyurethane resin powder is 75%, and the mass fraction of the acrylic composite powder is 25%.
Step five, secondary sieving: sieving the mixed powder after the fourth bonding step to prepare the required powder coating, thereby ensuring the uniform particle size distribution of the coating, avoiding the conditions of particle blockage and uneven particle size, and further ensuring the quality and coating effect of the coating;
respectively selecting thermoplastic polyurethane resin with mass fractions of 45%, 55%, 65% and 75% to be added into a system, and preparing corresponding acrylic resin with mass fractions of 55%, 45%, 35% and 25% according to the methods of the second embodiment, the third embodiment, the fourth embodiment and the fifth embodiment to obtain an aqueous environment-friendly PVDF fluorocarbon coating with thermoplastic polyurethane resin with different mass fractions, spraying the aqueous environment-friendly PVDF fluorocarbon coating onto the surface of a substrate member, selecting an equal-thickness aluminum plate as a substrate, spraying the PVDF fluorocarbon coating onto the surface of the aluminum plate by using electrostatic spraying equipment, putting the aluminum plate into a high-temperature oven, baking according to set curing conditions, and naturally cooling after the baking is finished to obtain a first group, a second group, a third group and a fourth group respectively;
The color of the thermoplastic polyurethane resin is gradually changed from cold white to warm white along with the proportional rising of the components of the thermoplastic polyurethane resin, when the components of the thermoplastic polyurethane resin reach 75% in the system, the overall color is optimal in each sample, the color distribution is uniform, and no obvious effect of uneven color distribution is generated. When the mass fraction of the thermoplastic polyurethane resin is 45% and 65%, shrinkage cavity defects appear on the surface of the coating, which indicates that when the content of the thermoplastic polyurethane resin component in the system is low, the air permeability of the coating is poor in the curing process, and bubbles are difficult to discharge, so that the defects are generated;
Bending experiments are respectively carried out on the first group, the second group, the third group and the fourth group by using bending machines, so that the bending performance of the coating is greatly improved from integral fracture to almost no fracture along with the improvement of the mass fraction of the thermoplastic polyurethane resin. Therefore, the thermoplastic polyurethane resin has a great improvement effect on improving the flexibility of the coating, and the improvement on the flexibility also has a great improvement effect on the performance of the whole coating, so that the durability of the PVDF fluorocarbon coating is improved, and the PVDF fluorocarbon coating accords with the characteristics of regeneration and environmental protection.
It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art and which are included in the embodiments of the present invention without the inventive step, are intended to be within the scope of the present invention. Structures, devices and methods of operation not specifically described and illustrated herein are implemented by conventional means in the art unless specifically indicated and limited by the context.
Claims (6)
1. An aqueous environment-friendly PVDF fluorocarbon coating, which is characterized in that: the paint comprises thermoplastic polyurethane resin, thermoplastic acrylic resin, titanium pigment, barium sulfate, a leveling agent, a defoaming agent, an adhesion promoter and an inorganic pigment, wherein the components are as follows in parts by weight: 70-75 parts of thermoplastic polyurethane resin, 10-15 parts of thermoplastic acrylic resin, 3-5 parts of titanium dioxide, 5-8 parts of barium sulfate, 1-2 parts of flatting agent, 1-2 parts of defoamer, 1-2 parts of adhesion promoter and 1-2 parts of inorganic pigment.
2. A process for producing an aqueous environment-friendly PVDF fluorocarbon coating, which is used for producing the aqueous environment-friendly PVDF fluorocarbon coating in the first claim, and is characterized by comprising the following steps:
step one, preparing production equipment: the production equipment comprises a double-screw extruder, a pulverizer, a bonding machine and a fine powder vibrating screen;
Step two, preparing acrylic composite powder: uniformly mixing thermoplastic acrylic resin, titanium dioxide, barium sulfate, a flatting agent, a defoaming agent, an adhesion promoter and an inorganic pigment, and crushing in a crusher;
Step three, sieving: mixing the raw materials of each component by using a double-screw extruder, extruding the raw materials into tablets, crushing the tablets by using a crusher, and sieving the crushed tablets by using a fine powder vibrating screen to obtain single-component acrylic acid composite powder;
Step four, bonding: sieving thermoplastic polyurethane resin powder by using a fine powder vibrating screen, mixing the sieved thermoplastic polyurethane resin powder with the acrylic composite powder prepared in the step three, and adding the mixture into a bonding machine for bonding;
step five, secondary sieving: and (3) sieving the mixed powder after the fourth bonding step to prepare the required powder coating.
3. The process for producing the aqueous environment-friendly PVDF fluorocarbon paint as set forth in claim 2, which is characterized in that: in the second step, the ingredients of the acrylic composite powder are thermoplastic acrylic resin 48%, barium sulfate 24.8%, titanium dioxide 16.4%, flatting agent 2.4% and defoaming agent 2.4%; 2.8% of adhesion promoter and 3.2% of inorganic pigment, and the mixing time in a mixer is 10min.
4. The process for producing the aqueous environment-friendly PVDF fluorocarbon paint as set forth in claim 2, which is characterized in that: and in the third step, the mesh number of the fine powder vibrating screen is 180 meshes, and the aperture of the fine powder vibrating screen is 0.075mm.
5. The process for producing the aqueous environment-friendly PVDF fluorocarbon paint as set forth in claim 2, which is characterized in that: the bonding in the fourth step comprises the following specific processes: and heating the mixed powder coating through a bonding machine, and bonding the thermoplastic polyurethane resin powder coating particles and the acrylic composite powder particles together, wherein the internal temperature of the bonding machine is 65 ℃, the bonding rotating speed is 800rmp, the heating rotating speed is 1600rmp, and the bonding time is 800s.
6. The process for producing the aqueous environment-friendly PVDF fluorocarbon paint as set forth in claim 2, which is characterized in that: in the fourth step, when the thermoplastic polyurethane resin powder is mixed with the acrylic composite powder, the mass fraction of the thermoplastic polyurethane resin powder is 70% -75%, and the mass fraction of the acrylic composite powder is 25% -30%.
Priority Applications (1)
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| CN202410088652.9A CN117903677A (en) | 2024-01-22 | 2024-01-22 | Water-based environment-friendly PVDF fluorocarbon coating and production process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410088652.9A CN117903677A (en) | 2024-01-22 | 2024-01-22 | Water-based environment-friendly PVDF fluorocarbon coating and production process thereof |
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