CN117487409B - Preparation method of polytetrafluoroethylene composite board - Google Patents
Preparation method of polytetrafluoroethylene composite board Download PDFInfo
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- CN117487409B CN117487409B CN202311846058.3A CN202311846058A CN117487409B CN 117487409 B CN117487409 B CN 117487409B CN 202311846058 A CN202311846058 A CN 202311846058A CN 117487409 B CN117487409 B CN 117487409B
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- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 137
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 137
- 239000002131 composite material Substances 0.000 title claims abstract description 116
- -1 polytetrafluoroethylene Polymers 0.000 title claims abstract description 86
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 229920001690 polydopamine Polymers 0.000 claims abstract description 70
- 229910052751 metal Inorganic materials 0.000 claims abstract description 66
- 239000002184 metal Substances 0.000 claims abstract description 66
- 239000011941 photocatalyst Substances 0.000 claims abstract description 55
- 239000000725 suspension Substances 0.000 claims abstract description 44
- VEALVRVVWBQVSL-UHFFFAOYSA-N strontium titanate Chemical compound [Sr+2].[O-][Ti]([O-])=O VEALVRVVWBQVSL-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 238000005507 spraying Methods 0.000 claims abstract description 15
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 66
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 42
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 41
- 239000008367 deionised water Substances 0.000 claims description 40
- 229910021641 deionized water Inorganic materials 0.000 claims description 40
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 30
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 30
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 30
- 238000003756 stirring Methods 0.000 claims description 27
- 238000001035 drying Methods 0.000 claims description 26
- 238000005406 washing Methods 0.000 claims description 24
- 239000000243 solution Substances 0.000 claims description 22
- 239000002245 particle Substances 0.000 claims description 20
- 239000000843 powder Substances 0.000 claims description 17
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 15
- 229960005070 ascorbic acid Drugs 0.000 claims description 15
- 235000010323 ascorbic acid Nutrition 0.000 claims description 15
- 239000011668 ascorbic acid Substances 0.000 claims description 15
- 239000004202 carbamide Substances 0.000 claims description 15
- 239000004408 titanium dioxide Substances 0.000 claims description 15
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 12
- 235000019441 ethanol Nutrition 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 10
- UUCCCPNEFXQJEL-UHFFFAOYSA-L strontium dihydroxide Chemical compound [OH-].[OH-].[Sr+2] UUCCCPNEFXQJEL-UHFFFAOYSA-L 0.000 claims description 10
- 229910001866 strontium hydroxide Inorganic materials 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 8
- 239000007864 aqueous solution Substances 0.000 claims description 7
- 244000137852 Petrea volubilis Species 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000000047 product Substances 0.000 claims description 5
- 238000000967 suction filtration Methods 0.000 claims description 5
- 239000006228 supernatant Substances 0.000 claims description 5
- 238000009210 therapy by ultrasound Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000004506 ultrasonic cleaning Methods 0.000 claims 1
- 238000004140 cleaning Methods 0.000 abstract description 25
- 230000001699 photocatalysis Effects 0.000 abstract description 10
- 239000000126 substance Substances 0.000 abstract description 10
- 230000003075 superhydrophobic effect Effects 0.000 abstract description 10
- 239000000758 substrate Substances 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 5
- 230000003373 anti-fouling effect Effects 0.000 abstract description 4
- 238000012986 modification Methods 0.000 abstract description 4
- 230000004048 modification Effects 0.000 abstract description 4
- 238000000151 deposition Methods 0.000 abstract description 3
- 239000007790 solid phase Substances 0.000 abstract description 3
- 230000000844 anti-bacterial effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000000576 coating method Methods 0.000 description 28
- 239000011248 coating agent Substances 0.000 description 27
- 230000000052 comparative effect Effects 0.000 description 21
- 238000012360 testing method Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 9
- 239000002086 nanomaterial Substances 0.000 description 9
- 238000011010 flushing procedure Methods 0.000 description 8
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 5
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 5
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 5
- 239000005642 Oleic acid Substances 0.000 description 5
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 5
- 238000006731 degradation reaction Methods 0.000 description 5
- 230000002209 hydrophobic effect Effects 0.000 description 5
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 5
- CXKWCBBOMKCUKX-UHFFFAOYSA-M methylene blue Chemical compound [Cl-].C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 CXKWCBBOMKCUKX-UHFFFAOYSA-M 0.000 description 5
- 229960000907 methylthioninium chloride Drugs 0.000 description 5
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 4
- 239000000356 contaminant Substances 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 235000019198 oils Nutrition 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- 241000588724 Escherichia coli Species 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 239000011538 cleaning material Substances 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 230000001678 irradiating effect Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229920001410 Microfiber Polymers 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 2
- 239000003658 microfiber Substances 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 150000003384 small molecules Chemical class 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 230000006750 UV protection Effects 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 150000001447 alkali salts Chemical class 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical class [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000009396 hybridization Methods 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002135 nanosheet Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000004224 protection Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 description 1
- 229940043267 rhodamine b Drugs 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 235000012424 soybean oil Nutrition 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000002371 ultraviolet--visible spectrum Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 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
- 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
- C09D127/18—Homopolymers or copolymers of tetrafluoroethene
-
- 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
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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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)
- Catalysts (AREA)
Abstract
The application relates to the technical field of polytetrafluoroethylene materials, and particularly discloses a preparation method of a polytetrafluoroethylene composite board. A process for preparing the composite polytetrafluoroethylene plate includes such steps as preparing the nano strontium titanate with high photocatalytic activity by hydrothermal method, and preparing g-C by solid-phase deposition method 3 N 4 The preparation method comprises the steps of preparing a TG composite photocatalyst with a heterojunction through ultrasonic blending, preparing an STG composite photocatalyst through modification of 1H, 2H-perfluoro dodecyl trichlorosilane, and finally preparing a PDA/PTFE/STG suspension through compositing polytetrafluoroethylene, polydopamine and the STG composite photocatalyst, and then spraying the suspension on the surface of a metal substrate. The polytetrafluoroethylene composite board prepared by the method has strong binding force with the metal substrate, has super-hydrophobic performance and photocatalytic activity, has excellent antifouling, self-cleaning and antibacterial performances, and has the advantages of good chemical stability and mechanical durability.
Description
Technical Field
The application relates to the technical field of polytetrafluoroethylene materials, in particular to a preparation method of a polytetrafluoroethylene composite board.
Background
The self-cleaning material means that dust and dirt on the surface can fall off or degrade under the action of natural forces such as wind, water, gravity and the like. Self-cleaning surfaces are classified into superhydrophobic physical self-cleaning surfaces and photocatalytic chemical self-cleaning surfaces. The physical self-cleaning properties enable glass, textiles, wood and metal to resist contamination by water and contaminants. Polytetrafluoroethylene has the characteristics of temperature resistance, chemical inertness, low surface energy, hydrophobicity and the like, and is a good antifouling material. However, in practical application, the organic grease contaminants are easy to adhere to the surface of the material and are not easy to be corroded and removed by water, so that the hydrophobic component of the self-cleaning material can be damaged, the hydrophobic performance is gradually reduced, and finally the super-hydrophobic self-cleaning performance of the self-cleaning material is lost. In addition, because polytetrafluoroethylene is not sticky to almost all substances, and is difficult to directly adhere to a metal surface, the bonding force between polytetrafluoroethylene and a metal substrate is increased by modification in the preparation process, and a composite hydrophobic antifouling material surface layer is formed.
Disclosure of Invention
In order to further improve self-cleaning capability and binding force between the polytetrafluoroethylene and a metal substrate, the application provides a preparation method of a polytetrafluoroethylene composite board.
The application provides a preparation method of a polytetrafluoroethylene composite board.
The following technical scheme is adopted:
the preparation method of the polytetrafluoroethylene composite board comprises the following steps: spraying PDA/PTFE/STG suspension onto the surface of the pretreated metal plate, and drying at 150-170 ℃ for 20-30min; the preparation method of the PDA/PTFE/STG suspension comprises the following steps: s1, adding titanium dioxide and strontium hydroxide into deionized water, stirring to form a uniform solution, then adding potassium hydroxide, continuously stirring for 20-50min, then transferring into a high-pressure polytetrafluoroethylene reactor, performing hydrothermal reaction for 4-6h at 160-180 ℃, and then performing suction filtration, washing and drying to obtain nanometer strontium titanate particles; s2, mixing and grinding ascorbic acid and urea, transferring into a dry autoclave, performing heat treatment at 180-200 ℃ for 2 hours, taking out and cooling to normal temperature, dispersing the product into deionized water, centrifugally washing and collecting supernatant to obtain g-C 3 N 4 A powder; s3, mixing nanometer strontium titanate particles with g-C 3 N 4 Dispersing the powder in deionized water, ultrasonically stirring for 2-3h, uniformly mixing, centrifugally washing with water and ethanol, and drying to obtain a TG composite photocatalyst; s4, compositing TG with lightDispersing the catalyst in ethanol water solution, slowly adding 1H, 2H-perfluoro dodecyl trichlorosilane after ultrasonic treatment for 20-40min, stirring at 80-90 ℃ for reaction for 8-10h, and then centrifugally washing and drying to obtain the STG composite photocatalyst; s5, uniformly dispersing polydopamine and polytetrafluoroethylene in ethyl acetate to obtain a PDA/PTFE suspension, dispersing an STG composite photocatalyst in the PDA/PTFE suspension, and ultrasonically stirring for 1-2h to obtain the PDA/PTFE/STG suspension.
By adopting the technical scheme, the nanometer strontium titanate with higher photocatalytic activity is prepared by a hydrothermal method, and the g-C is prepared by an additive solid phase deposition method 3 N 4 The method comprises the steps of preparing a TG composite photocatalyst with a heterojunction through ultrasonic blending, preparing an STG composite photocatalyst through modification of 1H, 2H-perfluoro dodecyl trichlorosilane, preparing a PDA/PTFE/STG suspension through compounding polytetrafluoroethylene, polydopamine and the STG composite photocatalyst, further preparing the PDA/PTFE/STG suspension into a metal substrate surface coating, mutually superposing and staggering the polytetrafluoroethylene, polydopamine and the STG composite photocatalyst to form a structure with a large number of cross-linked network-shaped protrusions and holes, constructing a micro-nano structure and enabling the micro-nano structure to have higher roughness, thereby enabling the micro-nano structure to have super-hydrophobic performance, further having excellent physical self-cleaning performance, and constructing a first daemon barrier; on the other hand, the STG composite photocatalyst has the chemical self-cleaning surface performance of photocatalytic activity, and organic pollutants are catalytically decomposed into small molecules such as carbon dioxide, water and the like, so that a second daemon barrier is constructed.
Preferably, the molar ratio of titanium dioxide, strontium hydroxide and potassium hydroxide in the step S1 is: (2.5-3.5): (2-3): (1.5-2.5), wherein the mass-volume ratio of deionized water to titanium dioxide is as follows: (20-30) mL (200-280) mg.
The nanometer strontium titanate prepared by adopting the technical scheme has a cubic perovskite structure, and is uniform in shape and size.
Preferably, the molar ratio of the ascorbic acid to the urea in S2 is: (5-8) the mass of deionized water is 100 times of the total mass of the ascorbic acid and the urea.
The g-C prepared by adopting the technical scheme 3 N 4 The powder is a nano-sheet structure with a large specific surface area.
Preferably, the nanometer strontium titanate particles and g-C in the step S3 3 N 4 The mass volume ratio of the powder is (1-8) (1-2), and the mass of deionized water is 100 times of that of the nanometer strontium titanate particles.
By adopting the technical scheme, the nanometer strontium titanate g-C 3 N 4 The powder can form a heterojunction hybridization structure, and has a wider photoresponse range and stronger photocatalytic efficiency.
Preferably, the mass ratio of the TG composite photocatalyst and the 1H, 2H-perfluorododecyl trichlorosilane in the S4 is: (7-10) 1-2; the mass ratio of the ethanol to the water in the ethanol water solution is as follows: (1-5) 1-3; the mass of the ethanol aqueous solution is 100 times of that of the TG composite photocatalyst.
By adopting the technical scheme, the dispersion stability of the TG composite photocatalyst is improved by modifying 1H, 2H-perfluoro dodecyl trichlorosilane.
Preferably, the mass volume ratio of the polydopamine, polytetrafluoroethylene, ethyl acetate and STG composite photocatalyst in the S5 is as follows: (10-30) g (25-50) g (60-80) mL (8-10) g.
By adopting the technical scheme, polytetrafluoroethylene, polydopamine and STG composite photocatalysts are mutually overlapped and staggered to form a structure with a large number of cross-linked network-shaped protrusions and holes, and a micro-nano structure is constructed and has higher roughness, so that the super-hydrophobic performance is achieved; on the other hand, the addition of polydopamine emphasizes the binding force of polydopamine with a metal substrate, and the addition of polytetrafluoroethylene is more beneficial to the increase of the mechanical durability, weather resistance and oxidation resistance of the polytetrafluoroethylene.
In summary, the present application has the following beneficial effects:
1. the PDA/PTFE/STG suspension is prepared by compounding polytetrafluoroethylene, polydopamine and STG composite photocatalyst, and is further used for coating the surface of a metal substrate, the polytetrafluoroethylene, polydopamine and STG composite photocatalyst are mutually overlapped and staggered to form a structure with a large number of cross-linked network-shaped protrusions and holes, a micro-nano structure is constructed, the micro-nano structure is made to have higher roughness, the micro-nano structure is made to have super-hydrophobic performance, and therefore the micro-nano structure has excellent physical self-cleaning performance, and a first daemon barrier is constructed; on the other hand, the STG composite photocatalyst has the chemical self-cleaning surface performance of photocatalytic activity, and organic pollutants are catalytically decomposed into small molecules such as carbon dioxide, water and the like, so that a second daemon barrier is constructed.
2. In the application, the nanometer strontium titanate with higher photocatalytic activity is preferably prepared by adopting a hydrothermal method, and the g-C is prepared by adding a solid phase deposition method 3 N 4 The TG composite photocatalyst with heterojunction is prepared by ultrasonic blending, the photoresponse range is expanded to visible light, the separation of electron-hole pairs is accelerated, the photocatalytic efficiency is improved, and finally the dispersion stability of the TG composite photocatalyst is improved by modifying 1H, 2H-perfluoro dodecyl trichlorosilane.
3. The coating of the polytetrafluoroethylene composite board prepared by the preparation method has strong binding force with a metal substrate, has super-hydrophobic performance and photocatalytic activity, has excellent antifouling, self-cleaning and antibacterial performances, has good chemical stability and mechanical durability, and has potential application under severe environmental conditions.
Drawings
Fig. 1: SEM images of polytetrafluoroethylene composite board coatings prepared in example 2 and comparative example 1 of the present application.
Detailed Description
The present application is described in further detail below with reference to examples.
The raw materials of the examples and comparative examples herein are commercially available in general unless otherwise specified.
Examples
Example 1
A polytetrafluoroethylene composite board comprises a metal board and a coating layer on the surface of the metal board; the coating is a PDA/PTFE/STG composite coating; the PDA/PTFE/STG composite coating is coated by PDA/PTFE/STG suspension; the saidThe preparation method of the PDA/PTFE/STG suspension comprises the following steps: s1, adding titanium dioxide and strontium hydroxide into deionized water, stirring to form a uniform solution, then adding potassium hydroxide, continuously stirring for 20min, then transferring into a high-pressure polytetrafluoroethylene reactor, carrying out hydrothermal reaction for 4h at 160 ℃, and then carrying out suction filtration, washing and drying to obtain nanometer strontium titanate particles, wherein the molar ratio of the titanium dioxide to the strontium hydroxide to the potassium hydroxide is 2.5:2:1.5, and the mass volume ratio of the deionized water to the titanium dioxide is 20mL:200mg; s2, mixing and grinding ascorbic acid and urea, transferring into a dry autoclave, performing heat treatment at 180 ℃ for 2 hours, taking out and cooling to normal temperature, dispersing the product into deionized water, centrifugally washing, and collecting supernatant to obtain g-C 3 N 4 Powder, wherein the molar ratio of the ascorbic acid to the urea is 5:1, and the mass of deionized water is 100 times of the total mass of the ascorbic acid and the urea; s3, mixing nanometer strontium titanate particles with g-C 3 N 4 Dispersing the powder in deionized water, ultrasonically stirring for 2 hours, after uniformly mixing, centrifugally washing with water and ethanol, and drying to obtain the TG composite photocatalyst, wherein nanometer strontium titanate particles and g-C 3 N 4 The mass-volume ratio of the powder is 1:1, and the mass of deionized water is 100 times of that of the nanometer strontium titanate particles; s4, dispersing the TG composite photocatalyst in an ethanol water solution with the mass of 100 times, slowly adding 1H, 2H-perfluorododecyl trichlorosilane after ultrasonic treatment for 20min, stirring at 80 ℃ for reaction for 8h, and centrifugally washing and drying to obtain the STG composite photocatalyst, wherein the mass ratio of the TG composite photocatalyst to the 1H, 2H-perfluorododecyl trichlorosilane is 7:1; the mass ratio of the ethanol to the water in the ethanol water solution is 1:1; s5, uniformly dispersing polydopamine and polytetrafluoroethylene in ethyl acetate to obtain a PDA/PTFE suspension, then dispersing an STG composite photocatalyst in the PDA/PTFE suspension, and carrying out ultrasonic stirring for 1h to obtain the PDA/PTFE/STG suspension, wherein the mass-volume ratio of polydopamine, polytetrafluoroethylene, ethyl acetate and STG composite photocatalyst is 10g:25g:60mL:8g.
The preparation method of the polytetrafluoroethylene composite board comprises the following steps: firstly grinding a metal plate (stainless steel, specification: 45 mm-15 mm-1 mm) with 200-mesh, 600-mesh, 900-mesh and 1200-mesh sand paper in sequence to remove most of oxide films of the metal plate, then soaking the metal plate with 25 mass percent dilute sulfuric acid solution to further remove residues of the surface oxide films, then flushing the metal plate with deionized water, then sequentially ultrasonically cleaning the metal plate in absolute ethyl alcohol and deionized water for 15min, taking out the metal plate, and drying the metal plate with nitrogen to obtain a smooth and clean metal plate; and then spraying the PDA/PTFE/STG suspension onto the surface of the pretreated metal plate by using a spray gun under the spraying pressure of 4MPa, and drying at 150 ℃ for 20min to obtain the polytetrafluoroethylene composite plate.
Example 2
A polytetrafluoroethylene composite board comprises a metal board and a coating layer on the surface of the metal board; the coating is a PDA/PTFE/STG composite coating; the PDA/PTFE/STG composite coating is coated by PDA/PTFE/STG suspension; the preparation method of the PDA/PTFE/STG suspension comprises the following steps: s1, adding titanium dioxide and strontium hydroxide into deionized water, stirring to form a uniform solution, then adding potassium hydroxide, continuously stirring for 30min, then transferring into a high-pressure polytetrafluoroethylene reactor, carrying out hydrothermal reaction at 170 ℃ for 5h, carrying out suction filtration, washing and drying to obtain nanometer strontium titanate particles, wherein the molar ratio of the titanium dioxide to the strontium hydroxide to the potassium hydroxide is 3:2.5:2, and the mass-volume ratio of the deionized water to the titanium dioxide is 25mL:240mg; s2, mixing and grinding ascorbic acid and urea, transferring into a dry autoclave, performing heat treatment at 190 ℃ for 2 hours, taking out and cooling to normal temperature, dispersing the product into deionized water, centrifugally washing, and collecting supernatant to obtain g-C 3 N 4 Powder, wherein the molar ratio of the ascorbic acid to the urea is 7:1.5, and the mass of deionized water is 100 times of the total mass of the ascorbic acid and the urea; s3, mixing nanometer strontium titanate particles with g-C 3 N 4 Dispersing the powder in deionized water, ultrasonically stirring for 2.5h, uniformly mixing, centrifugally washing with water and ethanol, and drying to obtain the TG composite photocatalyst, wherein nanometer strontium titanate particles and g-C 3 N 4 The mass-volume ratio of the powder is 2:1, and the mass of deionized water is 100 times of that of the nanometer strontium titanate particles;s4, dispersing the TG composite photocatalyst in an ethanol water solution with the mass being 100 times that of the TG composite photocatalyst, slowly adding 1H, 2H-perfluorododecyl trichlorosilane after ultrasonic treatment for 30min, stirring and reacting for 9h at the temperature of 85 ℃, and centrifugally washing and drying to obtain the STG composite photocatalyst, wherein the mass ratio of the TG composite photocatalyst to the 1H, 2H-perfluorododecyl trichlorosilane is 8:1; the mass ratio of the ethanol to the water in the ethanol water solution is 2:1; s5, uniformly dispersing polydopamine and polytetrafluoroethylene in ethyl acetate to obtain a PDA/PTFE suspension, then dispersing an STG composite photocatalyst in the PDA/PTFE suspension, and ultrasonically stirring for 1.5h to obtain the PDA/PTFE/STG suspension, wherein the mass-volume ratio of polydopamine, polytetrafluoroethylene, ethyl acetate and STG composite photocatalyst is 20g:40g:70mL:9g.
The preparation method of the polytetrafluoroethylene composite board comprises the following steps: firstly grinding a metal plate (stainless steel, specification: 45 mm-15 mm-1 mm) with 200-mesh, 600-mesh, 900-mesh and 1200-mesh sand paper in sequence to remove most of oxide films of the metal plate, then soaking the metal plate with 25 mass percent dilute sulfuric acid solution to further remove residues of the surface oxide films, then flushing the metal plate with deionized water, then sequentially ultrasonically cleaning the metal plate in absolute ethyl alcohol and deionized water for 15min, taking out the metal plate, and drying the metal plate with nitrogen to obtain a smooth and clean metal plate; and then spraying the PDA/PTFE/STG suspension onto the surface of the pretreated metal plate by using a spray gun under the spraying pressure of 5MPa, and drying at 160 ℃ for 25min to obtain the polytetrafluoroethylene composite plate.
Example 3
A polytetrafluoroethylene composite board comprises a metal board and a coating layer on the surface of the metal board; the coating is a PDA/PTFE/STG composite coating; the PDA/PTFE/STG composite coating is coated by PDA/PTFE/STG suspension; the preparation method of the PDA/PTFE/STG suspension comprises the following steps: s1, adding titanium dioxide and strontium hydroxide into deionized water, stirring to form a uniform solution, then adding potassium hydroxide, continuously stirring for 50min, then transferring into a high-pressure polytetrafluoroethylene reactor, performing hydrothermal reaction for 6h at 180 ℃, then performing suction filtration, washing and drying to obtain nanometer strontium titanate particles,wherein the mol ratio of titanium dioxide to strontium hydroxide to potassium hydroxide is 3.5:3:2.5, and the mass-volume ratio of deionized water to titanium dioxide is 30mL:280mg; s2, mixing and grinding ascorbic acid and urea, transferring into a dry autoclave, performing heat treatment at 200 ℃ for 2 hours, taking out and cooling to normal temperature, dispersing the product into deionized water, centrifugally washing, and collecting supernatant to obtain g-C 3 N 4 Powder, wherein the molar ratio of the ascorbic acid to the urea is 4:1, and the mass of deionized water is 100 times of the total mass of the ascorbic acid and the urea; s3, mixing nanometer strontium titanate particles with g-C 3 N 4 Dispersing the powder in deionized water, ultrasonically stirring for 3 hours, centrifugally washing with water and ethanol after uniformly mixing, and drying to obtain the TG composite photocatalyst, wherein nanometer strontium titanate particles and g-C 3 N 4 The mass-volume ratio of the powder is 4:1, and the mass of deionized water is 100 times of that of the nanometer strontium titanate particles; s4, dispersing the TG composite photocatalyst in an ethanol water solution with the mass being 100 times that of the TG composite photocatalyst, slowly adding 1H, 2H-perfluorododecyl trichlorosilane after ultrasonic treatment for 40min, stirring and reacting for 10h at 90 ℃, and centrifugally washing and drying to obtain the STG composite photocatalyst, wherein the mass ratio of the TG composite photocatalyst to the 1H, 2H-perfluorododecyl trichlorosilane is 5:1; the mass ratio of the ethanol to the water in the ethanol water solution is 5:1; s5, uniformly dispersing polydopamine and polytetrafluoroethylene in ethyl acetate to obtain a PDA/PTFE suspension, then dispersing an STG composite photocatalyst in the PDA/PTFE suspension, and carrying out ultrasonic stirring for 2 hours to obtain the PDA/PTFE/STG suspension, wherein the mass-volume ratio of polydopamine, polytetrafluoroethylene, ethyl acetate and STG composite photocatalyst is 30g:50g:80mL:10g.
The preparation method of the polytetrafluoroethylene composite board comprises the following steps: firstly grinding a metal plate (stainless steel, specification: 45 mm-15 mm-1 mm) with 200-mesh, 600-mesh, 900-mesh and 1200-mesh sand paper in sequence to remove most of oxide films of the metal plate, then soaking the metal plate with 25 mass percent dilute sulfuric acid solution to further remove residues of the surface oxide films, then flushing the metal plate with deionized water, then sequentially ultrasonically cleaning the metal plate in absolute ethyl alcohol and deionized water for 15min, taking out the metal plate, and drying the metal plate with nitrogen to obtain a smooth and clean metal plate; and then spraying the PDA/PTFE/STG suspension onto the surface of the pretreated metal plate by using a spray gun under the spraying pressure of 6MPa, and drying at 170 ℃ for 30min to obtain the polytetrafluoroethylene composite plate.
The metal plate in the application can also be other metals or composite metal materials such as copper, iron, zinc, manganese steel and the like, and are not described in detail herein.
Comparative example
Comparative example 1
The same as in example 2, except that the STG composite photocatalyst was not added, specifically: uniformly dispersing polydopamine and polytetrafluoroethylene in ethyl acetate, and ultrasonically stirring for 1.5h to obtain a PDA/PTFE suspension, wherein the mass-volume ratio of polydopamine to polytetrafluoroethylene to ethyl acetate is 20g:40g:70mL.
The preparation method of the polytetrafluoroethylene composite board comprises the following steps: firstly grinding a metal plate (stainless steel, specification: 45 mm-15 mm-1 mm) with 200-mesh, 600-mesh, 900-mesh and 1200-mesh sand paper in sequence to remove most of oxide films of the metal plate, then soaking the metal plate with 25 mass percent dilute sulfuric acid solution to further remove residues of the surface oxide films, then flushing the metal plate with deionized water, then sequentially ultrasonically cleaning the metal plate in absolute ethyl alcohol and deionized water for 15min, taking out the metal plate, and drying the metal plate with nitrogen to obtain a smooth and clean metal plate; and then spraying the PDA/PTFE/STG suspension onto the surface of the pretreated metal plate by using a spray gun under the spraying pressure of 5MPa, and drying at 160 ℃ for 25min to obtain the polytetrafluoroethylene composite plate.
Comparative example 2
The same as in example 2, except that "1H, 2H-perfluorododecyl trichlorosilane" was not added, i.e., the step S4 was not performed, the PDA/PTFE/TG suspension was directly obtained.
The PDA/PTFE/TG suspension is used for spraying instead of the PDA/PTFE/STG suspension.
Comparative example 3
The same as in example 2, except that: s5, adding no polydopamine, specifically: s5, uniformly dispersing polytetrafluoroethylene in ethyl acetate to obtain PTFE suspension, dispersing an STG composite photocatalyst in the PTFE suspension, and ultrasonically stirring for 1.5h to obtain PTFE/STG suspension, wherein the mass-volume ratio of polytetrafluoroethylene to ethyl acetate to the STG composite photocatalyst is 40g:70mL:9g.
The "PDA/PTFE/STG suspension" was replaced by the "PTFE/STG suspension" for spraying.
Performance test
(1) Microscopic topographical observations were made on the surface of the polytetrafluoroethylene composite sheet prepared in example 2 and the surface of the polytetrafluoroethylene composite sheet prepared in comparative example 1 using a scanning electron microscope, as shown in fig. 1, wherein fig. 1a: comparative example 1 coating; fig. 1b: example 2 coating; fig. 1c: example 2 coating under further microscopic magnification.
As can be seen from fig. 1a, the coating surface of the polytetrafluoroethylene composite board prepared only by using the PDA/PTFE suspension is arranged in a lamellar manner, wherein a large number of rolled microfibers are uniformly distributed, and the rolled microfibers may be doped polydopamine, so that the bonding force with a metal substrate is enhanced. As can be seen from fig. 1b and fig. 1c, the coating surface of the polytetrafluoroethylene composite board prepared from the PDA/PTFE/STG suspension contains a large number of cross-linked network-like protrusions and holes, which may be formed by stacking and interlacing the STG composite photocatalyst, the polydopamine and the polytetrafluoroethylene on the coating surface, so as to construct a micro-nano structure and form a higher roughness, which provides a powerful guarantee for obtaining the superhydrophobic performance of the PVDF/PTFE/MGT composite coating.
(2) The water contact angle test was performed on the coating samples using a SITA Sita SurfaSpector contact angle measurement instrument, germany, to characterize the hydrophobic properties. The polytetrafluoroethylene composite boards prepared in examples 1-3 and comparative examples 1-2 are used as samples to be tested, and after blank and different treatments, the samples to be tested are horizontally placed on a test bench for testing. Blank: no treatment is performed; the processing method comprises the following steps: soaking in acid (20% sulfuric acid solution) for 36h; soaking in alkali (saturated calcium hydroxide solution) for 36h; soaking the salt (sodium chloride solution with the mass fraction of 20%) for 36h; irradiating for 36h by a 365nm ultraviolet lamp; simulating rain for 12 hours; flushing the spray gun for 6 hours; sandpaper under a 500g weight was rubbed 50 times.
TABLE 1 contact angle (°) test results under different treatments
As can be seen from Table 1, the water contact angle of the surface of the coating of the polytetrafluoroethylene composite board prepared in the embodiment 1-3 of the application is as high as 161 degrees, and the coating has a superhydrophobic effect, so that the superhydrophobic self-cleaning performance is provided for the coating; even if the water is treated by acid, alkali, salt, ultraviolet and the like, the water contact angle still reaches up to 155 DEG or more, and the water contact angle has excellent acid and alkali salt resistance and ultraviolet resistance and good chemical stability; through simulated rainfall, spray gun flushing and wear resistance tests, the water contact angle is also not changed greatly, which indicates that the water flow flushing stability and mechanical stability are strong, and the durability is excellent. While the water contact angle of the surface of the coating of the polytetrafluoroethylene composite board prepared in the comparative examples 1-3 can reach 150 degrees when the coating is not treated, partial test results of the coating of the polytetrafluoroethylene composite board in acid, alkali, salt, ultraviolet treatment, rainfall, spray gun flushing and wear resistance tests are poor, particularly in the friction resistance test of the comparative example 3, the coating of the polytetrafluoroethylene composite board has friction stripping phenomenon, and the bonding force of the polydopamine to the metal board in the polytetrafluoroethylene composite board is probably greatly influenced.
(3) Further, the polytetrafluoroethylene composite sheets prepared in examples 1 to 3 and comparative examples 1 to 2 were subjected to a physical self-cleaning test, the polytetrafluoroethylene composite sheets were placed obliquely, and a simulated contaminant (oily soil: oil red-dyed soybean oil; aqueous soil: coffee aqueous solution; dye soil: rhodamine B aqueous solution) was sprinkled thereon, and the residual condition of the simulated contaminant on the surface of the polytetrafluoroethylene composite sheets was observed by means of water washing (washing time 30 s).
TABLE 2 short term self-cleaning test results
As can be seen from Table 2, the polytetrafluoroethylene composite board prepared in examples 1-3 of the application has a remarkably excellent self-cleaning effect, oily dirt, water-based dirt and dye dirt are easy to clean by means of water washing, and are hydrophobic and oleophobic, while the polytetrafluoroethylene composite board prepared in comparative examples 1-3 has the worst effect of comparative example 1, the effect of comparative example 2 is generally the same, the effect of comparative example 3 is slightly better than the former two, and it can be seen that the STG composite photocatalyst has the greatest effect on the physical self-cleaning effect of the polytetrafluoroethylene composite board.
(4) The chemical self-cleaning properties of the polytetrafluoroethylene composite sheets prepared in examples 1-3 and comparative examples 1-2 were characterized by degradation of methylene blue aqueous solution, oleic acid, and bacteria under irradiation of visible light. Placing the methylene blue aqueous solution into a beaker, irradiating the beaker with a xenon lamp for 4 hours, and calculating the degradation rate of the methylene blue by testing the UV-Vis absorption spectra of the methylene blue aqueous solution before and after irradiation; horizontally placing the polytetrafluoroethylene composite board, dripping about 0.08mL of oil red dyed oleic acid, irradiating for 12 hours by visible light, observing the areas of the oil red dyed oleic acid on the polytetrafluoroethylene composite board before and after irradiation, and calculating the oleic acid degradation rate; e.coli inoculation liquid is dripped on the surface of the polytetrafluoroethylene composite board, the PE film is covered, visible light is irradiated for 10 hours, meanwhile, a control group for dark condition culture is additionally arranged, the viable count of the surface of the polytetrafluoroethylene composite board after 10 hours is calculated and compared with that after dark condition culture, and the bacteriostasis rate of the E.coli is calculated, and the result is shown in Table 3.
TABLE 3 results of long-term self-cleaning test
As can be seen from Table 3, the polytetrafluoroethylene composite board prepared in examples 1-3 of the application has excellent chemical self-cleaning capability, the methylene blue is basically and completely degraded within 4 hours, the degradation rate reaches 99.9%, the degradation rate of oil red dyed oleic acid within 12 hours reaches 100%, and the bacteriostasis rate of escherichia coli reaches 99.7% after 10 hours. While the effect of comparative example 1 is the worst in the polytetrafluoroethylene composite plates prepared in comparative examples 1-3, the effect of comparative example 2 is generally, and the effect of comparative example 3 is slightly better than the former two, it can be seen that the STG composite photocatalyst added in the polytetrafluoroethylene composite plate prepared in the application is an important factor of long-term self-cleaning capability, and 1H, 2H-perfluoro dodecyl trichlorosilane may play a role in increasing the dispersion uniformity of the STG composite photocatalyst.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, insofar as they are protected by the patent laws within the scope of protection of the present application.
Claims (6)
1. The preparation method of the polytetrafluoroethylene composite board is characterized by comprising the following steps of: spraying PDA/PTFE/STG suspension onto the surface of the pretreated metal plate, and drying at 150-170 ℃ for 20-30min; the preparation method of the PDA/PTFE/STG suspension comprises the following steps: s1, adding titanium dioxide and strontium hydroxide into deionized water, stirring to form a uniform solution, then adding potassium hydroxide, continuously stirring for 20-50min, then transferring into a high-pressure polytetrafluoroethylene reactor, performing hydrothermal reaction for 4-6h at 160-180 ℃, and then performing suction filtration, washing and drying to obtain nanometer strontium titanate particles; s2, mixing and grinding ascorbic acid and urea, transferring into a dry autoclave, performing heat treatment at 180-200 ℃ for 2 hours, taking out and cooling to normal temperature, dispersing the product into deionized water, centrifugally washing and collecting supernatant to obtain g-C 3 N 4 A powder; s3, mixing nanometer strontium titanate particles with g-C 3 N 4 Dispersing the powder in deionized water, ultrasonically stirring for 2-3h, uniformly mixing, centrifugally washing with water and ethanol, and drying to obtain a TG composite photocatalyst; s4, dispersing the TG composite photocatalyst in an ethanol water solution, slowly adding 1H, 2H-perfluorododecyl trichlorosilane after ultrasonic treatment for 20-40min, stirring at 80-90 ℃ for reaction for 8-10h, and then centrifugally washing and drying to obtain the STG composite photocatalyst; s5, uniformly dispersing polydopamine and polytetrafluoroethylene in ethyl acetate to obtain a PDA/PTFE suspensionDispersing the STG composite photocatalyst in the PDA/PTFE suspension, and ultrasonically stirring for 1-2h to obtain the PDA/PTFE/STG suspension; the S3 nanometer strontium titanate particles and g-C 3 N 4 The mass volume ratio of the powder is (1-8), the mass of the deionized water is 100 times of the mass of the nanometer strontium titanate particles; the mass volume ratio of the polydopamine, polytetrafluoroethylene, ethyl acetate and STG composite photocatalyst in the S5 is as follows: (10-30) g (25-50) g (60-80) mL (8-10) g.
2. The method for preparing the polytetrafluoroethylene composite board according to claim 1, wherein the molar ratio of titanium dioxide, strontium hydroxide and potassium hydroxide in the S1 is: (2.5-3.5): (2-3): (1.5-2.5), wherein the mass-volume ratio of deionized water to titanium dioxide is as follows: (20-30) mL (200-280) mg.
3. The method for preparing the polytetrafluoroethylene composite board according to claim 2, wherein the molar ratio of the ascorbic acid to the urea in the S2 is: (5-8) the mass of deionized water is 100 times of the total mass of the ascorbic acid and the urea.
4. The preparation method of the polytetrafluoroethylene composite board as set forth in claim 3, wherein the mass ratio of the TG composite photocatalyst to the 1h,2 h-perfluorododecyl trichlorosilane in S4 is: (7-10) 1-2; the mass ratio of the ethanol to the water in the ethanol water solution is as follows: (1-5) 1-3; the mass of the ethanol aqueous solution is 100 times of that of the TG composite photocatalyst.
5. The method for preparing a polytetrafluoroethylene composite board according to claim 4, wherein the spraying tool is a spray gun, and the spraying pressure is 4-6MPa.
6. The method for preparing the polytetrafluoroethylene composite board according to claim 5, wherein the pretreatment process of the metal board is as follows: sequentially grinding the metal plate by using 200-mesh, 600-mesh, 900-mesh and 1200-mesh sand paper to remove most of oxide films of the metal plate, then soaking the metal plate by using 25-mass percent dilute sulfuric acid solution to further remove residues of the surface oxide films, then washing the metal plate by using deionized water, sequentially carrying out ultrasonic cleaning in absolute ethyl alcohol and the deionized water for 15min, taking out the metal plate, and then drying the metal plate by using nitrogen to finally obtain the metal plate with smooth and clean surface.
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