CN114806248A - Application method of fluorocarbon spraying coating additive - Google Patents
Application method of fluorocarbon spraying coating additive Download PDFInfo
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- CN114806248A CN114806248A CN202210397366.1A CN202210397366A CN114806248A CN 114806248 A CN114806248 A CN 114806248A CN 202210397366 A CN202210397366 A CN 202210397366A CN 114806248 A CN114806248 A CN 114806248A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/14—Paints containing biocides, e.g. fungicides, insecticides or pesticides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/57—Three layers or more the last layer being a clear coat
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- 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
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C09D127/16—Homopolymers or copolymers of vinylidene fluoride
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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
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/103—Anti-corrosive paints containing metal dust containing Al
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/45—Anti-settling agents
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/47—Levelling agents
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- 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
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/20—Metallic substrate based on light metals
- B05D2202/25—Metallic substrate based on light metals based on Al
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2506/00—Halogenated polymers
- B05D2506/10—Fluorinated polymers
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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
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0806—Silver
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- C08K3/00—Use of inorganic substances as compounding ingredients
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- C08K2003/0812—Aluminium
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- 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
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/328—Phosphates of heavy metals
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- C08L2201/00—Properties
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Abstract
The invention discloses a use method of a fluorocarbon spraying coating additive, which comprises the following steps: s1, preparing fluorocarbon spraying paint additive: the additive comprises the following components in percentage by mass: 28-42% of low-density polyethylene, 10-18% of glutaric anhydride, 6-12% of chlorinated polyethylene, 30-45% of hydrophobic filler and 4-8% of silver ion antibacterial agent; s2, pretreatment: pretreating the aluminum profile to form a passive film on the surface of the aluminum profile; s3, spraying fluorocarbon primer; s4, spraying fluorocarbon finish: adding a fluorocarbon spraying coating additive into a fluorocarbon finish paint formula, and performing electrostatic spraying on the fluorocarbon finish paint to form a fluorocarbon finish paint layer; s5, spraying fluorocarbon varnish; and S6, curing and baking. The method solves the problems of unstable product quality and chromatic aberration of the products produced by the existing fluorocarbon spraying process.
Description
Technical Field
The invention relates to a use method of a fluorocarbon spraying coating additive.
Background
The aluminum profile has the characteristics of small density, light weight, strong processability and plasticity and the like, and is widely applied to the field of building and home furnishing. In order to improve the corrosion resistance and aging resistance of the aluminum profile and improve the surface decoration effect of the aluminum profile, the aluminum profile is usually subjected to surface treatment. The aluminum profile surface treatment technology mainly comprises the following steps: powder spraying, fluorocarbon spraying, electrophoresis, anodic oxidation and wood grain transfer printing.
The fluorine resin has a fluorine-carbon bond structure with shorter bond length and much higher bond energy than that of carbon-carbon and carbon-oxygen bond energy, can be tightly arranged around the polymer, so that the fluorocarbon powder coating shows excellent weather resistance, and is widely used as a protective decorative coating of aluminum profiles.
The fluorocarbon spraying process comprises the following steps: surface pretreatment, priming paint, finishing paint, curing and baking. Patent application number CN202110580004.1 discloses a preparation method of a heat-insulating aluminum alloy profile, which comprises the following steps: carrying out sand blasting treatment on a glue injection notch of the aluminum alloy base material, and forming a sand surface on the surface of the glue injection notch; carrying out passivation pretreatment on the aluminum alloy base material; performing primer spraying treatment on the aluminum alloy substrate by adopting PVDF fluorocarbon coating, and drying; performing finish paint spraying treatment on the aluminum alloy substrate by adopting PVDF fluorocarbon coating, and drying; solidifying the aluminum alloy base material; embossing a glue injection notch of the aluminum alloy substrate, and forming a concave tooth notch at the edge of the glue injection notch; injecting heat-insulating glue into the glue injection notch, and drying and curing; and (5) carrying out bridge cutting on the aluminum alloy base material subjected to glue injection to obtain a finished product. The preparation method can obtain the aluminum alloy section with good weather resistance and good heat insulation effect, not only can the longitudinal shear mechanical property and the like meet the performance requirements, but also can be suitable for the high-strength sunlight irradiation outdoors. Patent application No. CN201510029035.2 discloses an aluminum alloy profile and a manufacturing method thereof, comprising: (1) pretreating an aluminum alloy profile base material; (2) carrying out anodic oxidation treatment on the pretreated aluminum alloy section to form an oxide film on the surface of the aluminum alloy section; (3) carrying out anodic electrophoresis treatment on the aluminum alloy section to form an electrophoresis paint film on the surface of the aluminum alloy section; (4) curing and baking the aluminum alloy section; (5) and spraying fluorocarbon coating on the surface of the aluminum alloy section to form a fluorocarbon coating. The fluorocarbon coating at least comprises a fluorocarbon primer layer, a fluorocarbon finish paint layer, a fluorocarbon varnish layer and a fluorocarbon middle coating. The manufacturing method has stable and feasible production process. The surface of the produced aluminum alloy section bar product is provided with a special composite film protective coating, has excellent performances of corrosion resistance, weather resistance and the like, can effectively resist the corrosion damage effect of ultraviolet rays, high humidity and aggressive salt ions on the aluminum alloy section bar, and is particularly suitable for islands and seaside area buildings under marine climate.
But the existing PVDF fluorocarbon coating has poor glossiness and gloss retention, and a high-gloss fluorocarbon paint film is difficult to produce. The primer sprayed on the surface of the aluminum profile can enhance the protection of the base material, improve the adhesive force of the finish paint and ensure the color uniformity of the finish paint film. The finish paint can provide required decorative colors, so that the appearance meets the design requirement, and the surface of the aluminum profile is protected from being corroded by the external environment. The varnish has the functions of protecting the finish coat, increasing the metallic luster of the finish coat color, and having more vivid appearance and dazzling luster. However, the adhesion between the paint films and the adhesion between the paint film and the aluminum profile are poor under the existing process conditions, so that the paint film is easy to fall off and cannot play the due role. In addition, the aluminum profile product after fluorocarbon spraying has unstable quality, uneven color and chromatic aberration.
Disclosure of Invention
Therefore, aiming at the above content, the invention provides a method for using a fluorocarbon spraying coating additive, which solves the problems of unstable product quality and chromatic aberration of the products produced by the existing fluorocarbon spraying process.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a use method of a fluorocarbon spraying coating additive comprises the following steps:
s1, preparing fluorocarbon spraying paint additive: the additive comprises the following components in percentage by mass: 28-42% of low-density polyethylene, 10-18% of glutaric anhydride, 6-12% of chlorinated polyethylene, 30-45% of hydrophobic filler and 4-8% of silver ion antibacterial agent;
s2, pretreatment: pretreating the aluminum profile to form a passive film on the surface of the aluminum profile;
s3, spraying fluorocarbon primer: uniformly spraying fluorocarbon primer on the surface of the aluminum profile by using a high-voltage electrostatic spray gun to form a fluorocarbon primer layer;
s4, spraying fluorocarbon finish: adding a fluorocarbon spraying coating additive into a fluorocarbon finish paint formula, wherein the addition amount of the fluorocarbon spraying coating additive is 3-6% of the mass of the fluorocarbon finish paint, uniformly stirring and mixing, and then uniformly spraying the fluorocarbon finish paint on the surface of the fluorocarbon primer layer by using a high-voltage electrostatic spray gun to form a fluorocarbon finish paint layer;
s5, spraying fluorocarbon varnish: uniformly spraying fluorocarbon varnish on the surface of the fluorocarbon finish paint layer by using a high-voltage electrostatic spray gun to form a fluorocarbon varnish layer;
s6, curing and baking: and curing and baking the aluminum profile, and cooling to obtain the fluorocarbon powder spraying aluminum profile product.
The further improvement is that: the hydrophobic filler is formed by mixing talcum powder subjected to surface modification treatment and silicon dioxide according to the mass ratio of 1: 0.8-2.
The further improvement is that: the silicon dioxide is subjected to surface modification treatment according to the following steps: (1) respectively weighing the following raw material components in parts by weight: 80-90 parts of silicon dioxide, 0.6-1.2 parts of perfluorooctyl triethoxysilane, 0.8-1.5 parts of benzoic acid and 0.1-0.3 part of triphenylphosphine; (2) adding 1/3 weight parts of perfluorooctyl triethoxysilane into the ethanol solution, adjusting the pH value with acetic acid to obtain weakly acidic perfluorooctyl triethoxysilane hydrolysate, adding silicon dioxide into the hydrolysate, stirring to react for 1-3h at 40-60 ℃, filtering and drying to obtain fluorosilane modified silicon dioxide; (3) dissolving 1/3 wt% of perfluorooctyl triethoxysilane and benzoic acid in a toluene solvent, adding triphenylphosphine, and performing esterification reaction under the atmosphere of inert gas to generate an ester compound; (4) dissolving an ester compound and fluorosilane modified silicon dioxide in a toluene solvent, and reacting to generate an intermediate product; (5) and reacting the residual perfluorooctyl triethoxysilane with the intermediate product to obtain the hydrophobic modified silicon dioxide.
The further improvement is that: the temperature of the esterification reaction is 80-100 ℃, and the reaction time is 3-6 h.
The further improvement is that: the reaction temperature of the step (4) is 85-95 ℃, and the reaction time is 40-60 min.
The further improvement is that: the reaction temperature of the step (5) is 90-105 ℃, and the reaction time is 20-40 min.
The further improvement is that: the fluorocarbon primer comprises the following components in parts by weight: 10-18 parts of hydroxy acrylic resin, 18-28 parts of PVDF fluorocarbon resin, 8-15 parts of polyester resin, 22-32 parts of propylene glycol methyl ether acetate, 12-20 parts of butyl acetate, 15-25 parts of barium sulfate, 0.8-2 parts of dispersant and 0.5-1.5 parts of flatting agent.
The further improvement is that: the fluorocarbon finish paint comprises the following components in parts by weight: 10-18 parts of hydroxy acrylic resin, 25-35 parts of PVDF (polyvinylidene fluoride) fluorocarbon resin, 22-32 parts of propylene glycol methyl ether acetate, 12-20 parts of butyl acetate, 6-10 parts of aluminum powder, 0.5-0.8 part of dispersant and 0.2-0.4 part of flatting agent.
The further improvement is that: the fluorocarbon varnish comprises the following components in parts by weight: 10-18 parts of hydroxy acrylic resin, 30-40 parts of PVDF fluorocarbon resin, 22-32 parts of propylene glycol methyl ether acetate, 12-20 parts of butyl acetate, 0.3-0.6 part of flatting agent, 0.2-0.4 part of ultraviolet absorbent and 0.1-0.3 part of light stabilizer.
The further improvement is that: the curing and baking temperature in S6 is 220-240 ℃, and the baking time is 15-30 min.
By adopting the technical scheme, the invention has the beneficial effects that:
the flaky interlayer structure of the talcum powder can effectively improve the leveling property of the coating, fill gaps among aluminum powder, reduce the defects of a coating and improve the gloss retention of the coating; and the diffusion path of the corrosive medium can be prolonged, thereby improving the weather resistance of the coating. Talc powder having a high aspect ratio also imparts higher impact resistance and fracture toughness to the coating film when the coating film is cured. Therefore, the talcum powder in the additive is added into the fluorocarbon finish paint, so that the paint film has excellent gloss retention and leveling property, and the impact resistance and weather resistance of the paint film are improved.
The molecular structure of the silane coupling agent perfluorooctyl triethoxysilane contains a large number of fluorine-containing groups, and the silicon dioxide is modified by the perfluorooctyl triethoxysilane to enable the particle surface to have hydrophobic groups, so that the surface of the silicon dioxide is endowed with superhydrophobicity. When the powder coating is cured at high temperature, the surface of the coating is easy to generate whitish patches due to water absorption of the coating, and the hydrophobic filler is obtained by performing surface modification treatment on the talcum powder and the silicon dioxide, so that the hydrophobic filler is added into the fluorocarbon finish paint to avoid white patches and improve the weather resistance of the coating. The ethoxy in the molecular structure of the perfluorooctyl triethoxysilane and the active silicon hydroxyl on the surface of the silicon dioxide are subjected to coupling reaction, so that the dispersion of the silicon dioxide in an organic system can be promoted. However, in the research process, the modified silicon dioxide obtained by using the perfluorooctyl triethoxysilane only has poor compatibility with an organic system. In order to solve the above problems, the present invention adopts the following method: firstly, under the catalytic action of triphenylphosphine, benzoic acid and perfluorooctyl triethoxysilane undergo esterification reaction to generate an ester compound; secondly, ester compounds and silicon dioxide modified by fluorosilane are subjected to coupling reaction, and functional groups of the ester compounds are grafted on the surface of the silicon dioxide (namely, an intermediate product is formed), so that the compatibility and the dispersibility of the silicon dioxide in an organic system are improved; and finally, performing coupling reaction on the perfluorooctyl triethoxysilane and active silicon hydroxyl on the surface of the intermediate product to firmly coat and fix the functional group of the ester compound on the surface of the silicon dioxide, so that the ester compound is not easy to fall off and the compatible dispersion effect of the silicon dioxide in an organic system is influenced.
The aluminum powder can be orderly arranged in the film forming process, and the luster, the texture and the color uniformity of a film are directly influenced. The low-density polyethylene in the additive has high shrinkage, so that a paint film can be quickly shrunk in the curing, baking and curing processes, the aluminum powder is prevented from moving up and down in the paint film, and the horizontal directional arrangement of the aluminum powder is assisted. The aluminum powder has high specific gravity and is easy to sink, and the silicon dioxide in the additive can play a good anti-settling effect. The existing fluorocarbon powder coating only has excellent weather resistance, and the silver ion antibacterial agent is added to endow a paint film with antibacterial property and inhibit the breeding and propagation of microorganisms on the surface of the aluminum profile. The chlorinated polyethylene contains strong-polarity chlorine atoms, and can be added into the fluorocarbon finish paint to enhance the binding force between the fluorocarbon finish paint and the fluorocarbon varnish by utilizing the strong polarity of the chlorinated polyethylene. And glutaric anhydride is added, so that the compactness of a paint film can be improved.
Furthermore, the film forming substances adopted by the fluorocarbon primer comprise hydroxy acrylic resin and polyester resin besides PVDF fluorocarbon resin, and the combination is mutually matched, so that the fluorocarbon primer can be firmly attached to the surface of the passive film, and the adhesive force of the fluorocarbon paint film and the aluminum profile is improved. In addition, the hydroxyl functional group of the hydroxyl acrylic resin in the fluorocarbon primer can generate cross-linking reaction with glutaric anhydride in the fluorocarbon finish paint, so that the bonding strength between the fluorocarbon primer and the fluorocarbon finish paint is improved.
Detailed Description
The following detailed description will be provided for the embodiments of the present invention with reference to specific embodiments, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented.
Unless otherwise indicated, the techniques employed in the examples are conventional and well known to those skilled in the art, and the reagents and products employed are also commercially available. The source, trade name and if necessary the constituents of the reagents used are indicated at the first appearance.
Example 1
A use method of a fluorocarbon spraying coating additive comprises the following steps:
s1, preparing the fluorocarbon spraying coating additive: the additive comprises the following components in percentage by mass: 28% of low-density polyethylene, 18% of glutaric anhydride, 6% of chlorinated polyethylene, 44% of hydrophobic filler and 4% of silver ion antibacterial agent; the silver ion antibacterial agent is prepared by mixing any one or more than two of zirconium phosphate-loaded silver, titanium dioxide-loaded silver and zeolite-loaded silver according to any ratio, and the titanium dioxide-loaded silver antibacterial agent is selected in the embodiment;
the hydrophobic filler is formed by mixing talcum powder subjected to surface modification treatment and silicon dioxide according to the mass ratio of 1:1.5, wherein the silicon dioxide is subjected to surface modification treatment according to the following steps: (1) respectively weighing the following raw material components in parts by weight: 80 parts of silicon dioxide, 0.6 part of perfluorooctyl triethoxysilane, 0.8 part of benzoic acid and 0.1 part of triphenylphosphine; (2) adding 1/3 weight parts of perfluorooctyl triethoxysilane into the ethanol solution, adjusting the pH value with acetic acid to obtain weakly acidic perfluorooctyl triethoxysilane hydrolysate, adding silicon dioxide into the hydrolysate, stirring for reaction for 3h at the reaction temperature of 40 ℃, filtering and drying to obtain fluorosilane modified silicon dioxide; (3) dissolving 1/3 weight parts of perfluorooctyl triethoxysilane and benzoic acid in a toluene solvent, adding triphenylphosphine, and carrying out esterification reaction under the inert gas atmosphere at the reaction temperature of 80 ℃ for 6 hours to generate an ester compound; (4) dissolving an ester compound and fluorosilane modified silicon dioxide in a toluene solvent, and reacting to generate an intermediate product, wherein the reaction temperature is 85 ℃, and the reaction time is 60 min; (5) reacting the residual perfluorooctyl triethoxysilane with the intermediate product at the reaction temperature of 90 ℃ for 40min to obtain hydrophobically modified silicon dioxide;
the surface modification treatment of the talcum powder is to put the talcum powder into alcoholysis solution of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, then to heat to 50 ℃, to stir for 80min, to filter and dry, wherein the addition amount of the gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane is 2 percent of the mass of the talcum powder;
s2, pretreatment: pretreating the aluminum profile to form a passive film on the surface of the aluminum profile, wherein the pretreatment is common knowledge in the field and comprises the procedures of oil removal, water solubility and passivation;
s3, spraying fluorocarbon primer: uniformly spraying fluorocarbon primer on the surface of the aluminum profile by using a high-voltage electrostatic spray gun to form a fluorocarbon primer layer, wherein the fluorocarbon primer layer comprises the following components in parts by weight: 10 parts of hydroxy acrylic resin, 18 parts of PVDF (polyvinylidene fluoride) fluorocarbon resin, 8 parts of polyester resin, 22 parts of propylene glycol methyl ether acetate, 12 parts of butyl acetate, 15 parts of barium sulfate, 0.8 part of dispersing agent and 0.5 part of flatting agent;
s4, spraying fluorocarbon finish: adding a fluorocarbon spraying coating additive into a fluorocarbon finish paint formula, wherein the addition amount of the fluorocarbon spraying coating additive is 3% of the mass of the fluorocarbon finish paint, and the fluorocarbon finish paint comprises the following components in parts by weight: 10 parts of hydroxy acrylic resin, 25 parts of PVDF (polyvinylidene fluoride) fluorocarbon resin, 22 parts of propylene glycol methyl ether acetate, 12 parts of butyl acetate, 6 parts of aluminum powder, 0.5 part of dispersant and 0.2 part of flatting agent, stirring and mixing uniformly, and then uniformly spraying fluorocarbon finish on the surface of the fluorocarbon primer layer by using a high-voltage electrostatic spray gun to form a fluorocarbon finish paint layer;
s5, spraying fluorocarbon varnish: uniformly spraying fluorocarbon varnish on the surface of the fluorocarbon finish paint layer by using a high-voltage electrostatic spray gun to form a fluorocarbon varnish layer, wherein the fluorocarbon varnish comprises the following components in parts by weight: 10 parts of hydroxy acrylic resin, 30 parts of PVDF fluorocarbon resin, 22 parts of propylene glycol methyl ether acetate, 12 parts of butyl acetate, 0.3 part of flatting agent, 0.2 part of ultraviolet absorbent and 0.1 part of light stabilizer;
s6, curing and baking: and curing and baking the aluminum profile, and cooling to obtain the fluorocarbon powder spraying aluminum profile product. In S6, the curing and baking temperature is 220 ℃, and the baking time is 30 min.
The performance of the aluminum profile is detected, and the detection result is as follows: the paint film has uniform color and smooth and flat appearance; the dry/wet adhesion (cross-hatch method) is 0 grade; the 4000h xenon lamp irradiation accelerated aging test does not generate the pulverization phenomenon; the light retention rate of QUVB accelerated aging for 2000h is 95.2 percent.
Example 2
A use method of a fluorocarbon spraying coating additive comprises the following steps:
s1, preparing fluorocarbon spraying paint additive: the additive comprises the following components in percentage by mass: 34% of low-density polyethylene, 14% of glutaric anhydride, 12% of chlorinated polyethylene, 34% of hydrophobic filler and 6% of zirconium phosphate silver-loaded antibacterial agent;
the hydrophobic filler is formed by mixing talcum powder subjected to surface modification treatment and silicon dioxide according to the mass ratio of 1:2, wherein the silicon dioxide is subjected to surface modification treatment according to the following steps: (1) respectively weighing the following raw material components in parts by weight: 85 parts of silicon dioxide, 0.9 part of perfluorooctyl triethoxysilane, 1.2 parts of benzoic acid and 0.2 part of triphenylphosphine; (2) adding 1/3 weight of perfluorooctyl triethoxysilane into the ethanol solution, adjusting the pH value with acetic acid to obtain weakly acidic perfluorooctyl triethoxysilane hydrolysate, then adding silicon dioxide into the hydrolysate, stirring and reacting for 2h at the reaction temperature of 50 ℃, filtering and drying to obtain fluorosilane modified silicon dioxide; (3) dissolving 1/3 weight parts of perfluorooctyl triethoxysilane and benzoic acid in a toluene solvent, adding triphenylphosphine, and carrying out esterification reaction under the inert gas atmosphere at the reaction temperature of 90 ℃ for 4 hours to generate an ester compound; (4) dissolving an ester compound and fluorosilane modified silicon dioxide in a toluene solvent, and reacting to generate an intermediate product, wherein the reaction temperature is 90 ℃ and the reaction time is 50 min; (5) reacting the residual perfluorooctyl triethoxysilane with the intermediate product at the reaction temperature of 100 ℃ for 30min to obtain hydrophobically modified silicon dioxide;
the surface modification treatment of the talcum powder is to put the talcum powder into alcoholysis solution of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, then to heat to 40 ℃, to stir for reaction for 100min, to filter and dry, wherein the addition amount of the gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane is 3 percent of the mass of the talcum powder;
s2, pretreatment: pretreating the aluminum profile to form a passive film on the surface of the aluminum profile;
s3, spraying fluorocarbon primer: uniformly spraying fluorocarbon primer on the surface of the aluminum profile by using a high-voltage electrostatic spray gun to form a fluorocarbon primer layer, wherein the fluorocarbon primer layer comprises the following components in parts by weight: 15 parts of hydroxy acrylic resin, 24 parts of PVDF (polyvinylidene fluoride) fluorocarbon resin, 12 parts of polyester resin, 28 parts of propylene glycol methyl ether acetate, 16 parts of butyl acetate, 20 parts of barium sulfate, 1.5 parts of a dispersing agent and 1 part of a flatting agent;
s4, spraying fluorocarbon finish: adding a fluorocarbon spraying coating additive into a fluorocarbon finish paint formula, wherein the addition amount of the fluorocarbon spraying coating additive is 5% of the mass of the fluorocarbon finish paint, and the fluorocarbon finish paint comprises the following components in parts by weight: 14 parts of hydroxyl acrylic resin, 30 parts of PVDF (polyvinylidene fluoride) fluorocarbon resin, 27 parts of propylene glycol methyl ether acetate, 16 parts of butyl acetate, 8 parts of aluminum powder, 0.6 part of dispersant and 0.3 part of flatting agent, stirring and mixing uniformly, and then uniformly spraying fluorocarbon finish on the surface of the fluorocarbon primer layer by using a high-voltage electrostatic spray gun to form a fluorocarbon finish paint layer;
s5, spraying fluorocarbon varnish: uniformly spraying fluorocarbon varnish on the surface of the fluorocarbon finish paint layer by using a high-voltage electrostatic spray gun to form a fluorocarbon varnish layer, wherein the fluorocarbon varnish layer comprises the following components in parts by weight: 14 parts of hydroxy acrylic resin, 35 parts of PVDF fluorocarbon resin, 27 parts of propylene glycol methyl ether acetate, 16 parts of butyl acetate, 0.5 part of flatting agent, 0.3 part of ultraviolet absorbent and 0.2 part of light stabilizer;
s6, curing and baking: and curing and baking the aluminum profile, and cooling to obtain the fluorocarbon powder spraying aluminum profile product. In S6, the curing and baking temperature is 230 ℃, and the baking time is 20 min.
The performance of the aluminum profile is detected, and the detection result is as follows: the paint film has uniform color and smooth and flat appearance; the dry/wet adhesion (cross-hatch method) is 0 grade; the 4000h xenon lamp irradiation accelerated aging test does not generate the pulverization phenomenon; the light retention rate of QUVB accelerated aging for 2000h is 96.5 percent.
Example 3
A use method of a fluorocarbon spraying coating additive comprises the following steps:
s1, preparing fluorocarbon spraying paint additive: the additive comprises the following components in percentage by mass: 42% of low-density polyethylene, 10% of glutaric anhydride, 9% of chlorinated polyethylene, 31% of hydrophobic filler and 8% of zeolite silver-loaded antibacterial agent;
the hydrophobic filler is formed by mixing talcum powder subjected to surface modification treatment and silicon dioxide according to the mass ratio of 1:1, wherein the silicon dioxide is subjected to surface modification treatment according to the following steps: (1) respectively weighing the following raw material components in parts by weight: 90 parts of silicon dioxide, 1.2 parts of perfluorooctyl triethoxysilane, 1.5 parts of benzoic acid and 0.3 part of triphenylphosphine; (2) adding 1/3 weight of perfluorooctyl triethoxysilane into the ethanol solution, adjusting the pH value with acetic acid to obtain weakly acidic perfluorooctyl triethoxysilane hydrolysate, then adding silicon dioxide into the hydrolysate, stirring and reacting for 1h at the reaction temperature of 60 ℃, filtering and drying to obtain fluorosilane modified silicon dioxide; (3) dissolving 1/3 weight parts of perfluorooctyl triethoxysilane and benzoic acid in a toluene solvent, adding triphenylphosphine, and carrying out esterification reaction under the inert gas atmosphere at the reaction temperature of 100 ℃ for 3 hours to generate an ester compound; (4) dissolving an ester compound and fluorosilane modified silicon dioxide in a toluene solvent, and reacting to generate an intermediate product, wherein the reaction temperature is 95 ℃ and the reaction time is 40 min; (5) reacting the remaining perfluorooctyl triethoxysilane with the intermediate product at the reaction temperature of 105 ℃ for 20min to obtain hydrophobically modified silicon dioxide;
the surface modification treatment of the talcum powder is to put the talcum powder into alcoholysis solution of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, then to heat to 60 ℃, to stir for reaction for 60min, to filter and dry, wherein the addition amount of the gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane is 4 percent of the mass of the talcum powder;
s2, pretreatment: pretreating the aluminum profile to form a passive film on the surface of the aluminum profile;
s3, spraying fluorocarbon primer: uniformly spraying fluorocarbon primer on the surface of the aluminum profile by using a high-voltage electrostatic spray gun to form a fluorocarbon primer layer, wherein the fluorocarbon primer layer comprises the following components in parts by weight: 18 parts of hydroxy acrylic resin, 28 parts of PVDF (polyvinylidene fluoride) fluorocarbon resin, 15 parts of polyester resin, 32 parts of propylene glycol methyl ether acetate, 20 parts of butyl acetate, 25 parts of barium sulfate, 2 parts of a dispersing agent and 1.5 parts of a flatting agent;
s4, spraying fluorocarbon finish: adding a fluorocarbon spraying coating additive into a fluorocarbon finish paint formula, wherein the addition amount of the fluorocarbon spraying coating additive is 6% of the mass of the fluorocarbon finish paint, and the fluorocarbon finish paint comprises the following components in parts by weight: 18 parts of hydroxy acrylic resin, 35 parts of PVDF (polyvinylidene fluoride) fluorocarbon resin, 32 parts of propylene glycol methyl ether acetate, 20 parts of butyl acetate, 10 parts of aluminum powder, 0.8 part of dispersant and 0.4 part of flatting agent, stirring and mixing uniformly, and then uniformly spraying fluorocarbon finish on the surface of the fluorocarbon primer layer by using a high-voltage electrostatic spray gun to form a fluorocarbon finish paint layer;
s5, spraying fluorocarbon varnish: uniformly spraying fluorocarbon varnish on the surface of the fluorocarbon finish paint layer by using a high-voltage electrostatic spray gun to form a fluorocarbon varnish layer, wherein the fluorocarbon varnish comprises the following components in parts by weight: 18 parts of hydroxy acrylic resin, 40 parts of PVDF (polyvinylidene fluoride) fluorocarbon resin, 32 parts of propylene glycol methyl ether acetate, 20 parts of butyl acetate, 6 parts of a leveling agent, 0.4 part of an ultraviolet light absorber and 0.3 part of a light stabilizer;
s6, curing and baking: and curing and baking the aluminum profile, and cooling to obtain the fluorocarbon powder spraying aluminum profile product. In S6, the curing and baking temperature is 240 ℃, and the baking time is 15 min.
The performance of the aluminum profile is detected, and the detection result is as follows: the paint film has uniform color and smooth and flat appearance; the dry/wet adhesion (cross-hatch method) is 0 grade; the 4000h xenon lamp irradiation accelerated aging test does not generate the pulverization phenomenon; the light retention rate of QUVB accelerated aging for 2000h is 96.0 percent.
Comparative example 1
The difference from example 1 is that: and step S1 is omitted, namely the fluorocarbon spraying coating additive is not added into the fluorocarbon finish paint.
The performance of the aluminum profile of the comparative example is detected, and the detection result is as follows: the paint film has obvious color difference and slight orange peel appearance; the dry adhesion (cross-hatch method) is grade 1, and the wet adhesion (cross-hatch method) is grade 2; after the xenon lamp irradiation accelerated aging test is carried out for 3000 hours, the pulverization phenomenon starts to be generated; the light retention rate of QUVB accelerated aging for 2000h is 71.4 percent.
Comparative example 2
The difference from example 1 is that: the fluorocarbon spraying coating additive does not contain talcum powder.
The performance of the aluminum profile of the comparative example is detected, and the detection result is as follows: the dry/wet adhesion (cross-hatch method) is 0 grade; after 3500 hours of the xenon lamp irradiation accelerated aging test, the pulverization phenomenon begins to occur; the light retention rate of QUVB accelerated aging for 2000h is 84.7 percent.
Comparative example 3
The difference from example 1 is that: the fluorocarbon spraying coating additive does not contain low-density polyethylene.
The performance of the aluminum profile of the comparative example is detected, and the detection result is as follows: the paint film has obvious color difference and slight orange peel appearance.
Comparative example 4
The difference from example 1 is that: the fluorocarbon spraying coating additive does not contain glutaric anhydride.
The performance of the aluminum profile of the comparative example is detected, and the detection result is as follows: the dry/wet adhesion (cross-hatch) was grade 1.
Comparative example 5
The difference from example 1 is that: the fluorocarbon spraying coating additive does not contain chlorinated polyethylene.
The performance of the aluminum profile of the comparative example is detected, and the detection result is as follows: the dry/wet adhesion (cross-hatch method) is grade 1; after 3500h of xenon lamp irradiation accelerated aging test, powdering phenomenon begins to occur.
The above description is only an embodiment utilizing the technical content of the present disclosure, and any modification and variation made by those skilled in the art can be covered by the claims of the present disclosure, and not limited to the embodiments disclosed.
Claims (10)
1. A use method of a fluorocarbon spraying coating additive is characterized in that: the method comprises the following steps:
s1, preparing fluorocarbon spraying paint additive: the additive comprises the following components in percentage by mass: 28-42% of low-density polyethylene, 10-18% of glutaric anhydride, 6-12% of chlorinated polyethylene, 30-45% of hydrophobic filler and 4-8% of silver ion antibacterial agent;
s2, pretreatment: pretreating the aluminum profile to form a passive film on the surface of the aluminum profile;
s3, spraying fluorocarbon primer: uniformly spraying fluorocarbon primer on the surface of the aluminum profile by using a high-voltage electrostatic spray gun to form a fluorocarbon primer layer;
s4, spraying fluorocarbon finish: adding a fluorocarbon spraying coating additive into a fluorocarbon finish paint formula, wherein the addition amount of the fluorocarbon spraying coating additive is 3-6% of the mass of the fluorocarbon finish paint, uniformly stirring and mixing, and then uniformly spraying the fluorocarbon finish paint on the surface of the fluorocarbon primer layer by using a high-voltage electrostatic spray gun to form a fluorocarbon finish paint layer;
s5, spraying fluorocarbon varnish: uniformly spraying fluorocarbon varnish on the surface of the fluorocarbon finish paint layer by using a high-voltage electrostatic spray gun to form a fluorocarbon varnish layer;
s6, curing and baking: and curing and baking the aluminum profile, and cooling to obtain the fluorocarbon powder spraying aluminum profile product.
2. A method of using a fluorocarbon spray coating additive as claimed in claim 1, wherein: the hydrophobic filler is formed by mixing talcum powder subjected to surface modification treatment and silicon dioxide according to the mass ratio of 1: 0.8-2.
3. A method of using a fluorocarbon spray coating additive as claimed in claim 2, wherein: the silicon dioxide is subjected to surface modification treatment according to the following steps: (1) respectively weighing the following raw material components in parts by weight: 80-90 parts of silicon dioxide, 0.6-1.2 parts of perfluorooctyl triethoxysilane, 0.8-1.5 parts of benzoic acid and 0.1-0.3 part of triphenylphosphine; (2) adding 1/3 weight parts of perfluorooctyl triethoxysilane into the ethanol solution, adjusting the pH value with acetic acid to obtain weakly acidic perfluorooctyl triethoxysilane hydrolysate, adding silicon dioxide into the hydrolysate, stirring to react for 1-3h at 40-60 ℃, filtering and drying to obtain fluorosilane modified silicon dioxide; (3) dissolving 1/3 wt% of perfluorooctyl triethoxysilane and benzoic acid in a toluene solvent, adding triphenylphosphine, and performing esterification reaction under the atmosphere of inert gas to generate an ester compound; (4) dissolving an ester compound and fluorosilane modified silicon dioxide in a toluene solvent, and reacting to generate an intermediate product; (5) and reacting the residual perfluorooctyl triethoxysilane with the intermediate product to obtain the hydrophobic modified silicon dioxide.
4. A method of using a fluorocarbon spray coating additive as claimed in claim 3, wherein: the temperature of the esterification reaction is 80-100 ℃, and the reaction time is 3-6 h.
5. A method of using a fluorocarbon spray coating additive as claimed in claim 3, wherein: the reaction temperature of the step (4) is 85-95 ℃, and the reaction time is 40-60 min.
6. A method of using a fluorocarbon spray coating additive as claimed in claim 3, wherein: the reaction temperature of the step (5) is 90-105 ℃, and the reaction time is 20-40 min.
7. A method of using a fluorocarbon spray coating additive as claimed in claim 1, wherein: the fluorocarbon primer comprises the following components in parts by weight: 10-18 parts of hydroxy acrylic resin, 18-28 parts of PVDF fluorocarbon resin, 8-15 parts of polyester resin, 22-32 parts of propylene glycol methyl ether acetate, 12-20 parts of butyl acetate, 15-25 parts of barium sulfate, 0.8-2 parts of dispersant and 0.5-1.5 parts of flatting agent.
8. A method of using a fluorocarbon spray coating additive as claimed in claim 1, wherein: the fluorocarbon finish paint comprises the following components in parts by weight: 10-18 parts of hydroxy acrylic resin, 25-35 parts of PVDF (polyvinylidene fluoride) fluorocarbon resin, 22-32 parts of propylene glycol methyl ether acetate, 12-20 parts of butyl acetate, 6-10 parts of aluminum powder, 0.5-0.8 part of dispersant and 0.2-0.4 part of flatting agent.
9. A method of using a fluorocarbon spray coating additive as claimed in claim 1, wherein: the fluorocarbon varnish comprises the following components in parts by weight: 10-18 parts of hydroxy acrylic resin, 30-40 parts of PVDF fluorocarbon resin, 22-32 parts of propylene glycol methyl ether acetate, 12-20 parts of butyl acetate, 0.3-0.6 part of flatting agent, 0.2-0.4 part of ultraviolet absorbent and 0.1-0.3 part of light stabilizer.
10. A method of using a fluorocarbon spray coating additive as claimed in claim 1, wherein: the curing and baking temperature in S6 is 220-240 ℃, and the baking time is 15-30 min.
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| CN115445893A (en) * | 2022-09-30 | 2022-12-09 | 浙江三禾厨具有限公司 | Spraying process of anti-yellowing pot |
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