CN117264506B - Antibacterial powder coating and preparation method thereof - Google Patents

Antibacterial powder coating and preparation method thereof Download PDF

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CN117264506B
CN117264506B CN202311573534.9A CN202311573534A CN117264506B CN 117264506 B CN117264506 B CN 117264506B CN 202311573534 A CN202311573534 A CN 202311573534A CN 117264506 B CN117264506 B CN 117264506B
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powder coating
epoxy resin
modified bentonite
bentonite
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CN117264506A (en
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窦新鹏
窦心涛
彭勇
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Saigao Powder Technology Binzhou Co ltd
Saigaoxin Materials Technology Co ltd
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Saigao Powder Technology Binzhou Co ltd
Saigaoxin Materials Technology Co ltd
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D163/00Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D5/00Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03Powdery paints
    • C09D5/033Powdery paints characterised by the additives
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D5/00Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/03Powdery paints
    • C09D5/033Powdery paints characterised by the additives
    • C09D5/038Anticorrosion agents
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    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D5/00Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08Anti-corrosive paints
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    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09D5/00Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/14Paints containing biocides, e.g. fungicides, insecticides or pesticides
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/16Halogen-containing compounds
    • C08K2003/162Calcium, strontium or barium halides, e.g. calcium, strontium or barium chloride
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/18Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20Oxides; Hydroxides
    • C08K3/22Oxides; Hydroxides of metals
    • C08K2003/2217Oxides; Hydroxides of metals of magnesium
    • C08K2003/222Magnesia, i.e. magnesium oxide
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/18Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20Oxides; Hydroxides
    • C08K3/22Oxides; Hydroxides of metals
    • C08K2003/2231Oxides; Hydroxides of metals of tin
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
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Abstract

The invention belongs to the technical field of powder coatings, and particularly relates to an antibacterial powder coating and a preparation method thereof. The antibacterial powder coating provided by the invention comprises the following raw materials in parts by weight: 45-47 parts of hydrogenated bisphenol A epoxy resin, 7-8 parts of phenol type phenolic epoxy resin, 35-37 parts of polyester resin, 0.3-0.5 part of calcium fluoride, 3-3.5 parts of polyvinyl butyral, 25-27 parts of modified bentonite and 3-3.5 parts of nano tin oxide. The antibacterial powder coating disclosed by the invention is prepared by crosslinking and curing hydrogenated bisphenol A epoxy resin, phenol type phenolic epoxy resin and polyester resin, so that the mechanical property, weather resistance and corrosion resistance of the prepared powder coating are ensured; modified bentonite and nano tin oxide are added as filler, and the two are compounded for use to ensure that the prepared powder coating has excellent antibacterial property and hydrophobicity.

Description

Antibacterial powder coating and preparation method thereof
Technical Field
The invention belongs to the technical field of powder coatings, and particularly relates to an antibacterial powder coating and a preparation method thereof.
Background
The powder coating comprises various series products such as epoxy polyester mixed type products, epoxy type products, polyester type products, polyurethane type products and the like. With the development of low-temperature curing powder coatings, the powder coatings can be used for spraying metal surfaces and nonmetallic substrates. However, in some places where the weather is moist and the temperature is moderate and the water is often contacted, the places coated by the powder coating still can be affected by harmful microorganisms such as bacteria, mold and the like, so that the coating film is stained, discolored, pulverized and finally falls off, and if the harmful bacteria are contacted with a human body, various diseases can be transmitted, thereby seriously threatening the health of the human body. Thus, the antimicrobial coating should be shipped.
The antibacterial powder coating not only has the congenital advantages of the powder coating, but also has surface antibacterial property, provides positive effects on reducing the transmission of germs, and has wide application prospect. And adding a certain amount of antibacterial material into the powder coating to prepare the antibacterial powder coating. Antibacterial materials can be divided into two main types, namely dissolution type and contact type, and generally natural organic antibacterial materials belong to dissolution type, such as natural crustacean, mustard and castor oil; inorganic antibacterial materials such as quaternary ammonium salts, thionic acid compounds, sorbic acid. The dissolution type antibacterial material has limited effect and cannot have long-term broad spectrum. Generally, the contact type antibacterial material has long duration of antibacterial effect, inorganic metal is used as the representative of the contact type antibacterial material, such as mercury, silver, copper, chromium, zinc and the like, has different degrees of killing effect on microorganisms, and the antibacterial metal ions are slowly released from the carrier to effectively kill and inhibit harmful bacteria attached to the surface for a long time.
Compared with the traditional chemical sterilization and physical sterilization, the antibacterial mode of the antibacterial powder coating has the advantages that: (1) security: harmless to health and no pollution to environment. (2) long-acting: the coated film had the same scrub resistance as the article life. (3) broad spectrum: can effectively inhibit bacteria represented by Escherichia coli, staphylococcus aureus and Candida albicans. (4) convenient use: one-time construction is beneficial for a long time.
The existing antibacterial coating mainly achieves the antibacterial effect by adding metal oxides such as titanium dioxide, cerium oxide and zinc oxide, but the inorganic metal oxides can exert the antibacterial effect only through photoinduction, and the addition amount of the inorganic metal oxides in the coating is limited, so that the antibacterial effect of the coating is limited. Therefore, there is a need to explore a new antimicrobial powder coating.
Disclosure of Invention
The purpose of the invention is that: an antimicrobial powder coating is provided. The antibacterial powder coating has antibacterial property and hydrophobicity; the invention also provides a preparation method thereof.
The antibacterial powder coating provided by the invention comprises the following raw materials in parts by weight: 45-47 parts of hydrogenated bisphenol A epoxy resin, 7-8 parts of phenol type phenolic epoxy resin, 35-37 parts of polyester resin, 0.3-0.5 part of calcium fluoride, 3-3.5 parts of polyvinyl butyral, 25-27 parts of modified bentonite and 3-3.5 parts of nano tin oxide.
Preferably, the antibacterial powder coating provided by the invention comprises the following raw materials in parts by weight: 46 parts of hydrogenated bisphenol A epoxy resin, 7.5 parts of phenol type phenolic epoxy resin, 36 parts of polyester resin, 0.4 part of calcium fluoride, 3.3 parts of polyvinyl butyral, 26 parts of modified bentonite and 3.3 parts of nano tin oxide.
Wherein:
the acid value of the polyester resin is 32-41mgKOH/g.
The preparation method of the modified bentonite comprises the following steps:
(1) Calcining bentonite at 450-460 ℃ for 2-2.2h, cooling to room temperature, grinding and sieving with a 300-mesh sieve to obtain activated bentonite;
(2) Adding the activated bentonite prepared in the step (1) into a methanol solution of anhydrous magnesium acetate, carrying out hydrothermal reaction after ultrasonic dispersion is uniform, cooling to room temperature, drying, and finally calcining at 520-530 ℃ for 5.2-5.5h to prepare the nano magnesium oxide modified bentonite;
(3) Adding the nano magnesium oxide modified bentonite prepared in the step (2) into toluene solution, then adding heptadecafluorodecyl trimethoxysilane, carrying out reflux stirring reaction for 20-22h under nitrogen atmosphere, washing with absolute ethyl alcohol, then carrying out vacuum drying, and finally grinding and sieving with a 300-mesh sieve to obtain the heptadecafluorodecyl trimethoxysilane grafted nano magnesium oxide modified bentonite.
Wherein:
in the step (2), the mass ratio of the activated bentonite to the anhydrous magnesium acetate is 1:1.2; the mass volume ratio of the anhydrous magnesium acetate to the methanol solution is 1:28, and the unit is g/mL.
The hydrothermal reaction temperature in the step (2) is 73-75 ℃, and the hydrothermal reaction time is 8.3-8.5h.
The ultrasonic dispersion time in the step (2) is 17-20min.
In the step (2), the drying treatment temperature is 65-67 ℃ and the drying treatment time is 14-15h.
In the step (3), the mass-volume ratio of the nano magnesium oxide modified bentonite to the toluene is 5:110, and the unit is g/mL.
In the step (3), the mass-volume ratio of the nano magnesium oxide modified bentonite to the heptadecafluorodecyl trimethoxysilane is 5:4.5, and the unit is g/mL.
The temperature of the reflux stirring reaction in the step (3) is 91-93 ℃.
In the step (3), the vacuum drying temperature is 65-67 ℃ and the drying time is 10-11h.
According to the antibacterial powder coating disclosed by the invention, the hydrogenated bisphenol A epoxy resin and the phenol type phenolic epoxy resin are compounded for crosslinking and curing with the polyester resin, and the hydrogenated bisphenol A epoxy resin does not contain unsaturated bonds in molecules and has low viscosity, so that more fillers-modified bentonite can be added in the preparation of the antibacterial powder coating, the prepared powder coating has good weather resistance, the phenol type phenolic epoxy resin is additionally added, and the crosslinking density is high after the phenol type phenolic epoxy resin is cured, so that the mechanical property and the chemical corrosion resistance of the powder coating after spraying are ensured.
According to the antibacterial powder coating disclosed by the invention, modified bentonite and nano tin oxide are compounded for use, so that the antibacterial property of the prepared powder coating is ensured, firstly, the bentonite is subjected to calcination treatment, the specific surface area of the bentonite is further improved on the premise of ensuring that the pore structure of the bentonite is not damaged, preparation is made for subsequent modification and grafting reaction, then, part of magnesium element enters a bentonite lattice for realizing doping through a solvothermal synthesis method, the rest of magnesium element is loaded in the bentonite in a nano magnesium oxide form, the nano magnesium oxide has excellent antibacterial property, and finally, the nano magnesium oxide modified bentonite is subjected to grafting treatment by adopting heptadecafluorodecyl trimethoxysilane, and the heptadecafluorodecyl trimethoxysilane is grafted on the surface of the nano magnesium oxide modified bentonite, so that the prepared modified bentonite has hydrophobicity. Therefore, the prepared modified bentonite has antibacterial property and hydrophobicity, and the prepared modified bentonite is added into the powder coating as a filler, so that the powder coating has a hydrophobic surface and a certain antibacterial property, the adhesion of the powder coating to bacteria is greatly reduced by the hydrophobic surface, but the bacteria cannot be killed, and the nano tin oxide is added additionally, so that the nano tin oxide has good antibacterial property to both escherichia coli and staphylococcus aureus. Therefore, the modified bentonite and the nano tin oxide have synergistic effect, so that the prepared powder coating has excellent antibacterial property and hydrophobicity, and further has the effects of reducing bacterial adhesion, inhibiting bacteria and sterilizing.
Calcium fluoride and polyvinyl butyral are additionally added into the antibacterial powder coating, and the addition of the calcium fluoride is used for improving the adhesive force of the powder coating, and the polyvinyl butyral plays a role of a leveling agent.
The preparation method of the antibacterial powder coating provided by the invention comprises the following steps: hydrogenated bisphenol A epoxy resin, phenol type phenolic epoxy resin, polyester resin, calcium fluoride, polyvinyl butyral, modified bentonite and nano tin oxide are uniformly stirred and mixed, then melt extrusion is carried out to obtain an extrusion sheet, and finally grinding and crushing are carried out to obtain the antibacterial powder coating.
Wherein:
the stirring and mixing temperature is 60-65deg.C, and the stirring and mixing time is 4-6min.
The extrusion temperature is 115-120 ℃.
Grinding, crushing and sieving with a 400-mesh sieve.
Compared with the prior art, the invention has the following beneficial effects:
(1) The antibacterial powder coating disclosed by the invention is prepared by crosslinking and curing hydrogenated bisphenol A epoxy resin, phenol type phenolic epoxy resin and polyester resin, so that the mechanical property, weather resistance and corrosion resistance of the prepared powder coating are ensured; modified bentonite and nano tin oxide are added as filler, and the antibacterial property and the hydrophobicity of the prepared powder coating are ensured by compounding the modified bentonite and the nano tin oxide.
(2) The preparation method of the antibacterial powder coating provided by the invention is convenient to operate, the technological parameters are easy to control, the production is facilitated, the antibacterial powder coating prepared by the method is easy to spray, the coating is stable in performance and good in leveling property, and the binding force with a metal substrate is strong.
Detailed Description
The invention is further described below with reference to examples.
The hydrogenated bisphenol A epoxy resin was XY518 manufactured by Anhui New technology Co., ltd.
The phenolic novolac epoxy resin is EPON 160 sold by wali trade limited, guangzhou.
Example 1
The antibacterial powder coating of the embodiment 1 comprises the following raw materials in parts by weight: 46 parts of hydrogenated bisphenol A epoxy resin, 7.5 parts of phenol type phenolic epoxy resin, 36 parts of polyester resin, 0.4 part of calcium fluoride, 3.3 parts of polyvinyl butyral, 26 parts of modified bentonite and 3.3 parts of nano tin oxide.
Wherein:
the acid value of the polyester resin was 38mgKOH/g.
The preparation method of the modified bentonite comprises the following steps:
(1) Calcining bentonite at 455 ℃ for 2.1h, cooling to room temperature, grinding, and sieving with a 300-mesh sieve to prepare activated bentonite;
(2) Adding the activated bentonite prepared in the step (1) into a methanol solution of anhydrous magnesium acetate, performing hydrothermal reaction after uniform ultrasonic dispersion, cooling to room temperature, drying, and finally calcining at 525 ℃ for 5.4 hours to prepare the nano magnesium oxide modified bentonite;
(3) Adding the nano magnesium oxide modified bentonite prepared in the step (2) into toluene solution, then adding heptadecafluorodecyl trimethoxysilane, carrying out reflux stirring reaction for 21h under nitrogen atmosphere, washing with absolute ethyl alcohol, carrying out vacuum drying, and finally grinding and sieving with a 300-mesh sieve to obtain the heptadecafluorodecyl trimethoxysilane grafted nano magnesium oxide modified bentonite.
Wherein:
in the step (2), the mass ratio of the activated bentonite to the anhydrous magnesium acetate is 1:1.2; the mass volume ratio of the anhydrous magnesium acetate to the methanol solution is 1:28, and the unit is g/mL.
The hydrothermal reaction temperature in the step (2) is 74 ℃, and the hydrothermal reaction time is 8.4h.
The ultrasonic dispersion time in the step (2) is 18min.
The drying treatment temperature in the step (2) is 66 ℃, and the drying treatment time is 14.5h.
In the step (3), the mass-volume ratio of the nano magnesium oxide modified bentonite to the toluene is 5:110, and the unit is g/mL.
In the step (3), the mass-volume ratio of the nano magnesium oxide modified bentonite to the heptadecafluorodecyl trimethoxysilane is 5:4.5, and the unit is g/mL.
The temperature of the reflux stirring reaction in the step (3) was 92 ℃.
The vacuum drying temperature in the step (3) is 66 ℃, and the drying time is 10.5h.
The preparation method of the antibacterial powder coating of the embodiment 1 comprises the following steps: hydrogenated bisphenol A epoxy resin, phenol type phenolic epoxy resin, polyester resin, calcium fluoride, polyvinyl butyral, modified bentonite and nano tin oxide are uniformly stirred and mixed, then melt extrusion is carried out to obtain an extrusion sheet, and finally grinding and crushing are carried out to obtain the antibacterial powder coating.
Wherein:
the stirring and mixing temperature was 63℃and the stirring and mixing time was 5min.
The extrusion temperature was 117 ℃.
Grinding, crushing and sieving with a 400-mesh sieve.
Example 2
The antibacterial powder coating of the embodiment 2 comprises the following raw materials in parts by weight: 45 parts of hydrogenated bisphenol A epoxy resin, 8 parts of phenol type phenolic epoxy resin, 37 parts of polyester resin, 0.3 part of calcium fluoride, 3.5 parts of polyvinyl butyral, 25 parts of modified bentonite and 3.5 parts of nano tin oxide.
Wherein:
the acid value of the polyester resin was 32mgKOH/g.
The preparation method of the modified bentonite comprises the following steps:
(1) Calcining bentonite at 450 ℃ for 2 hours, cooling to room temperature, grinding and sieving with a 300-mesh sieve to prepare activated bentonite;
(2) Adding the activated bentonite prepared in the step (1) into a methanol solution of anhydrous magnesium acetate, performing hydrothermal reaction after uniform ultrasonic dispersion, cooling to room temperature, drying, and finally calcining at 520 ℃ for 5.2 hours to prepare the nano magnesium oxide modified bentonite;
(3) Adding the nano magnesium oxide modified bentonite prepared in the step (2) into toluene solution, then adding heptadecafluorodecyl trimethoxysilane, carrying out reflux stirring reaction for 20h under nitrogen atmosphere, washing with absolute ethyl alcohol, carrying out vacuum drying, and finally grinding and sieving with a 300-mesh sieve to obtain the heptadecafluorodecyl trimethoxysilane grafted nano magnesium oxide modified bentonite.
Wherein:
in the step (2), the mass ratio of the activated bentonite to the anhydrous magnesium acetate is 1:1.2; the mass volume ratio of the anhydrous magnesium acetate to the methanol solution is 1:28, and the unit is g/mL.
The hydrothermal reaction temperature in the step (2) is 73 ℃, and the hydrothermal reaction time is 8.3h.
The ultrasonic dispersion time in the step (2) is 17min.
In the step (2), the drying treatment temperature is 65 ℃ and the drying treatment time is 14h.
In the step (3), the mass-volume ratio of the nano magnesium oxide modified bentonite to the toluene is 5:110, and the unit is g/mL.
In the step (3), the mass-volume ratio of the nano magnesium oxide modified bentonite to the heptadecafluorodecyl trimethoxysilane is 5:4.5, and the unit is g/mL.
The temperature of the reflux stirring reaction in the step (3) was 91 ℃.
The vacuum drying temperature in the step (3) is 65 ℃ and the drying time is 10 hours.
The preparation method of the antibacterial powder coating described in the embodiment 2 comprises the following steps: hydrogenated bisphenol A epoxy resin, phenol type phenolic epoxy resin, polyester resin, calcium fluoride, polyvinyl butyral, modified bentonite and nano tin oxide are uniformly stirred and mixed, then melt extrusion is carried out to obtain an extrusion sheet, and finally grinding and crushing are carried out to obtain the antibacterial powder coating.
Wherein:
the stirring and mixing temperature was 60℃and the stirring and mixing time was 6min.
The extrusion temperature was 115 ℃.
Grinding, crushing and sieving with a 400-mesh sieve.
Example 3
The antibacterial powder coating described in the embodiment 3 comprises the following raw materials in parts by weight: 47 parts of hydrogenated bisphenol A epoxy resin, 7 parts of phenol type phenolic epoxy resin, 35 parts of polyester resin, 0.5 part of calcium fluoride, 3 parts of polyvinyl butyral, 27 parts of modified bentonite and 3 parts of nano tin oxide.
Wherein:
the acid value of the polyester resin was 41mgKOH/g.
The preparation method of the modified bentonite comprises the following steps:
(1) Calcining bentonite at 460 ℃ for 2.2 hours, cooling to room temperature, grinding, and sieving with a 300-mesh sieve to prepare activated bentonite;
(2) Adding the activated bentonite prepared in the step (1) into a methanol solution of anhydrous magnesium acetate, performing hydrothermal reaction after uniform ultrasonic dispersion, cooling to room temperature, drying, and finally calcining at 530 ℃ for 5.5 hours to prepare nano magnesium oxide modified bentonite;
(3) Adding the nano magnesium oxide modified bentonite prepared in the step (2) into toluene solution, then adding heptadecafluorodecyl trimethoxysilane, carrying out reflux stirring reaction for 22h under nitrogen atmosphere, washing with absolute ethyl alcohol, carrying out vacuum drying, and finally grinding and sieving with a 300-mesh sieve to obtain the heptadecafluorodecyl trimethoxysilane grafted nano magnesium oxide modified bentonite.
Wherein:
in the step (2), the mass ratio of the activated bentonite to the anhydrous magnesium acetate is 1:1.2; the mass volume ratio of the anhydrous magnesium acetate to the methanol solution is 1:28, and the unit is g/mL.
The hydrothermal reaction temperature in the step (2) is 75 ℃, and the hydrothermal reaction time is 8.5h.
The ultrasonic dispersion time in the step (2) is 20min.
In the step (2), the drying treatment temperature is 67 ℃, and the drying treatment time is 15 hours.
In the step (3), the mass-volume ratio of the nano magnesium oxide modified bentonite to the toluene is 5:110, and the unit is g/mL.
In the step (3), the mass-volume ratio of the nano magnesium oxide modified bentonite to the heptadecafluorodecyl trimethoxysilane is 5:4.5, and the unit is g/mL.
The temperature of the reflux stirring reaction in the step (3) was 93 ℃.
The vacuum drying temperature in the step (3) is 67 ℃ and the drying time is 11h.
The preparation method of the antibacterial powder coating described in the embodiment 3 comprises the following steps: hydrogenated bisphenol A epoxy resin, phenol type phenolic epoxy resin, polyester resin, calcium fluoride, polyvinyl butyral, modified bentonite and nano tin oxide are uniformly stirred and mixed, then melt extrusion is carried out to obtain an extrusion sheet, and finally grinding and crushing are carried out to obtain the antibacterial powder coating.
Wherein:
the stirring and mixing temperature was 65℃and the stirring and mixing time was 4min.
The extrusion temperature was 120 ℃.
Grinding, crushing and sieving with a 400-mesh sieve.
Comparative example 1
The preparation method of the antibacterial powder coating material of this comparative example 1 is the same as that of example 1, except that the raw material composition of the antibacterial powder coating material is different. The antibacterial powder coating of the comparative example 1 comprises the following raw materials in parts by weight: 46 parts of hydrogenated bisphenol A epoxy resin, 7.5 parts of phenol type phenolic epoxy resin, 36 parts of polyester resin, 0.4 part of calcium fluoride, 3.3 parts of polyvinyl butyral and 26 parts of modified bentonite.
Comparative example 2
The preparation method of the antibacterial powder coating material of this comparative example 2 is the same as that of example 1, except that the raw material composition of the antibacterial powder coating material is different. The antibacterial powder coating of the comparative example 2 comprises the following raw materials in parts by weight: 46 parts of hydrogenated bisphenol A epoxy resin, 7.5 parts of phenol type phenolic epoxy resin, 36 parts of polyester resin, 0.4 part of calcium fluoride, 3.3 parts of polyvinyl butyral and 3.3 parts of nano tin oxide.
Comparative example 3
The preparation method of the antibacterial powder coating material of this comparative example 3 is the same as that of example 1, except that the raw material composition of the antibacterial powder coating material is different. The antibacterial powder coating of the comparative example 3 comprises the following raw materials in parts by weight: 46 parts of hydrogenated bisphenol A epoxy resin, 36 parts of polyester resin, 0.4 part of calcium fluoride, 3.3 parts of polyvinyl butyral, 26 parts of modified bentonite and 3.3 parts of nano tin oxide.
The antibacterial powder coatings prepared in examples 1-3 and comparative examples 1-3 were sprayed onto tin plates for performance testing, wherein: salt spray resistance test, wherein a sodium chloride solution with the mass concentration of 5% is adopted for continuous spray experiment at 35 ℃, and rust spreading of the cross notch edge in 840h is less than 2mm; the weather resistance test is to place a sample in the direction from the east to the south of an outdoor weather resistance test field for insolation, wherein the time from 30 minutes after sunrise to 30 minutes before sunset ensures direct sunlight, and the average annual sunlight time is more than 2000 hours; the results are shown in table 1 below:
TABLE 1 results of performance tests of antibacterial powder coatings described in examples 1-3 and comparative examples 1-3
As is clear from comparative examples 1 to 2, when modified bentonite or nano tin oxide is omitted from the raw materials of the powder coating, the antibacterial property of the prepared powder coating is reduced, and the mechanical properties, hydrophobicity, salt spray resistance and weather resistance of the powder coating are also affected; as is clear from comparative example 3, omitting the phenol novolac epoxy resin from the raw materials of the powder coating material results in a decrease in the mechanical properties of the prepared antibacterial powder coating material, and further in a decrease in the salt spray resistance and weather resistance.

Claims (5)

1. An antimicrobial powder coating, characterized by: the composite material consists of the following raw materials in parts by weight: 45-47 parts of hydrogenated bisphenol A epoxy resin, 7-8 parts of phenol type phenolic epoxy resin, 35-37 parts of polyester resin, 0.3-0.5 part of calcium fluoride, 3-3.5 parts of polyvinyl butyral, 25-27 parts of modified bentonite and 3-3.5 parts of nano tin oxide;
wherein:
the preparation method of the modified bentonite comprises the following steps:
(1) Calcining bentonite at 450-460 ℃ for 2-2.2h, cooling to room temperature, grinding and sieving with a 300-mesh sieve to obtain activated bentonite;
(2) Adding the activated bentonite prepared in the step (1) into a methanol solution of anhydrous magnesium acetate, carrying out hydrothermal reaction after ultrasonic dispersion is uniform, cooling to room temperature, drying, and finally calcining at 520-530 ℃ for 5.2-5.5h to prepare the nano magnesium oxide modified bentonite;
(3) Adding the nano magnesium oxide modified bentonite prepared in the step (2) into toluene solution, then adding heptadecafluorodecyl trimethoxysilane, carrying out reflux stirring reaction for 20-22h under nitrogen atmosphere, washing with absolute ethyl alcohol, then carrying out vacuum drying, and finally grinding and sieving with a 300-mesh sieve to obtain the heptadecafluorodecyl trimethoxysilane grafted nano magnesium oxide modified bentonite;
wherein:
in the step (2), the mass ratio of the activated bentonite to the anhydrous magnesium acetate is 1:1.2; the mass volume ratio of the anhydrous magnesium acetate to the methanol solution is 1:28, and the unit is g/mL;
the hydrothermal reaction temperature in the step (2) is 73-75 ℃, and the hydrothermal reaction time is 8.3-8.5h;
the ultrasonic dispersion time in the step (2) is 17-20min;
in the step (2), the drying treatment temperature is 65-67 ℃ and the drying treatment time is 14-15h;
in the step (3), the mass-volume ratio of the nano magnesium oxide modified bentonite to the toluene is 5:110, and the unit is g/mL;
in the step (3), the mass-volume ratio of the nano magnesium oxide modified bentonite to the heptadecafluorodecyl trimethoxysilane is 5:4.5, and the unit is g/mL;
in the step (3), the temperature of the reflux stirring reaction is 91-93 ℃;
in the step (3), the vacuum drying temperature is 65-67 ℃ and the drying time is 10-11h.
2. An antimicrobial powder coating according to claim 1, wherein: the composite material consists of the following raw materials in parts by weight: 46 parts of hydrogenated bisphenol A epoxy resin, 7.5 parts of phenol type phenolic epoxy resin, 36 parts of polyester resin, 0.4 part of calcium fluoride, 3.3 parts of polyvinyl butyral, 26 parts of modified bentonite and 3.3 parts of nano tin oxide.
3. An antimicrobial powder coating according to claim 1, wherein: the acid value of the polyester resin is 32-41mgKOH/g.
4. A method of preparing the antimicrobial powder coating of claim 1, wherein: the method comprises the following steps: hydrogenated bisphenol A epoxy resin, phenol type phenolic epoxy resin, polyester resin, calcium fluoride, polyvinyl butyral, modified bentonite and nano tin oxide are uniformly stirred and mixed, then melt extrusion is carried out to obtain an extrusion sheet, and finally grinding and crushing are carried out to obtain the antibacterial powder coating.
5. The method for preparing the antibacterial powder coating according to claim 4, wherein: stirring and mixing at 60-65deg.C for 4-6min;
the extrusion temperature is 115-120 ℃;
grinding, crushing and sieving with a 400-mesh sieve.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103382353A (en) * 2013-07-08 2013-11-06 吴江市物华五金制品有限公司 Heavy-duty anticorrosion environmental-friendly enhanced powder coating
CN105694673A (en) * 2016-03-24 2016-06-22 安徽圣德建材科技有限公司 High-toughness high-strength antirust powder paint
CN106085103A (en) * 2016-06-12 2016-11-09 宜兴市巨人涂料有限公司 A kind of weather-proof uvioresistant epoxy toner coating and preparation method thereof
CN108299935A (en) * 2018-01-31 2018-07-20 枞阳县三金颜料有限责任公司 A kind of preparation method of the filler of reinforced resin coating intensity
WO2021022389A1 (en) * 2019-08-02 2021-02-11 擎天材料科技有限公司 Polyester resin composition, powder coating and workpiece

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103382353A (en) * 2013-07-08 2013-11-06 吴江市物华五金制品有限公司 Heavy-duty anticorrosion environmental-friendly enhanced powder coating
CN105694673A (en) * 2016-03-24 2016-06-22 安徽圣德建材科技有限公司 High-toughness high-strength antirust powder paint
CN106085103A (en) * 2016-06-12 2016-11-09 宜兴市巨人涂料有限公司 A kind of weather-proof uvioresistant epoxy toner coating and preparation method thereof
CN108299935A (en) * 2018-01-31 2018-07-20 枞阳县三金颜料有限责任公司 A kind of preparation method of the filler of reinforced resin coating intensity
WO2021022389A1 (en) * 2019-08-02 2021-02-11 擎天材料科技有限公司 Polyester resin composition, powder coating and workpiece

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