CN115216221A - Anti-pollution flashover coating with surface layer self-cleaning function and preparation method thereof - Google Patents
Anti-pollution flashover coating with surface layer self-cleaning function and preparation method thereof Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 64
- 239000011248 coating agent Substances 0.000 title claims abstract description 61
- 238000004140 cleaning Methods 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000002344 surface layer Substances 0.000 title claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000002245 particle Substances 0.000 claims abstract description 61
- 239000000843 powder Substances 0.000 claims abstract description 49
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000000463 material Substances 0.000 claims abstract description 46
- 239000002105 nanoparticle Substances 0.000 claims abstract description 38
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 35
- 229920005989 resin Polymers 0.000 claims abstract description 33
- 239000011347 resin Substances 0.000 claims abstract description 33
- 239000003822 epoxy resin Substances 0.000 claims abstract description 29
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 29
- 239000002904 solvent Substances 0.000 claims abstract description 28
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 23
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 23
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 22
- 239000010703 silicon Substances 0.000 claims abstract description 22
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 11
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 7
- 229920002050 silicone resin Polymers 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 26
- 239000002270 dispersing agent Substances 0.000 claims description 20
- 238000009736 wetting Methods 0.000 claims description 20
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 claims description 18
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 claims description 18
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 16
- 239000008096 xylene Substances 0.000 claims description 16
- 239000006185 dispersion Substances 0.000 claims description 14
- 229910021485 fumed silica Inorganic materials 0.000 claims description 13
- 238000000227 grinding Methods 0.000 claims description 13
- 239000007822 coupling agent Substances 0.000 claims description 12
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 239000003921 oil Substances 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 9
- 239000002318 adhesion promoter Substances 0.000 claims description 8
- 230000032683 aging Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000002518 antifoaming agent Substances 0.000 claims description 7
- ZHPNWZCWUUJAJC-UHFFFAOYSA-N fluorosilicon Chemical compound [Si]F ZHPNWZCWUUJAJC-UHFFFAOYSA-N 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 229920002379 silicone rubber Polymers 0.000 claims description 5
- 238000000967 suction filtration Methods 0.000 claims description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical group C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000004945 silicone rubber Substances 0.000 claims description 4
- 238000009210 therapy by ultrasound Methods 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 3
- 238000012986 modification Methods 0.000 claims description 3
- 239000013530 defoamer Substances 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical class [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000005286 illumination Methods 0.000 abstract description 5
- 239000002957 persistent organic pollutant Substances 0.000 abstract description 5
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 230000003628 erosive effect Effects 0.000 abstract description 4
- 230000002209 hydrophobic effect Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 4
- 238000009422 external insulation Methods 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- 230000003373 anti-fouling effect Effects 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000012046 mixed solvent Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000005028 tinplate Substances 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
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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
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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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
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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
- C09D5/18—Fireproof paints including high temperature resistant paints
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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
- C09D7/60—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
- C09D7/66—Additives characterised by particle size
- C09D7/67—Particle size smaller than 100 nm
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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
- C09D7/66—Additives characterised by particle size
- C09D7/69—Particle size larger than 1000 nm
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/80—Processes for incorporating ingredients
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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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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Abstract
The invention provides an anti-pollution flashover coating with a surface self-cleaning function and a preparation method thereof, wherein the preparation method comprises the following steps: base material: a modified silicone resin; modified micro-nano particle size powder: silicon dioxide, aluminum hydroxide and titanium dioxide with different modified particle sizes; and a dispersing solvent and an organic auxiliary agent. The epoxy resin is used for modifying the organic silicon resin, so that the base material obtained not only keeps good adhesion of the epoxy resin, but also keeps excellent characteristics of the organic silicon resin; meanwhile, micro-nano particle size powder materials are matched with one another, so that a well-constructed hydrophobic coating structure is not easy to accumulate dirt; the compatibility and combination of the silicon dioxide and the aluminum hydroxide with different modified particle sizes improve the combustion resistance, the tracking resistance, the electrical erosion resistance and the mechanical property of the coating; due to the characteristics of the titanium dioxide, the titanium dioxide can degrade organic pollutants on the surface of the coating under the natural illumination condition to realize the self-cleaning property of the surface of the coating.
Description
Technical Field
The invention belongs to the field related to preparation of high-performance coatings, and particularly relates to an anti-pollution flashover coating with a surface layer self-cleaning function and a preparation method thereof.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, the ultra-high voltage digital power transmission and transformation projects are constructed on a large scale nationwide, and the protection project amount of corresponding external insulation equipment parts of the power transmission and transformation lines is increased more and more. The method has higher requirements on the dirt resistance of the external insulation equipment parts of the transmission and transformation lines. The anti-pollution flashover coating plays a quite positive role in the safe operation of a power grid as the application in the field.
At present, the anti-pollution flashover coating on the external insulation part of the power transmission and transformation mainly takes the traditional RTV and PRTV coatings as the main materials, but the traditional RTV and PRTV coatings can not completely meet the requirements of actual use along with the improvement of voltage grade, serious pollution to the atmospheric environment of partial heavy industrial areas and the like, and have the problems of short service cycle and frequent replacement cycle. The reason is that the anti-pollution flashover coating can accumulate a large amount of organic pollutants and dust on the surface of the coating when being used in a long-term external environment, is difficult to clean manually, and is easy to cause flashover on the surface of an external insulation equipment part in a high-humidity or rainy and snowy weather, so that circuit faults are caused.
According to the relevant literature data, the current mainstream room temperature vulcanized silicone rubber anti-fouling flashover coating mainly uses single silicone rubber as a base material, and active calcium carbonate, carbon black, clay, mica, aluminum hydroxide, silica and the like are added as fillers to obtain the anti-fouling flashover coating with the required performance, but the problems of easy fouling, easy aging, poor durability and the like still exist.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an anti-pollution flashover coating with a surface layer self-cleaning function and a preparation method thereof, wherein the preparation method comprises the following steps: base material: silicone resins modified with epoxy resins; modified micro-nano particle size powder: silicon dioxide, aluminum hydroxide and titanium dioxide with different modified particle sizes; and a dispersing solvent and an organic auxiliary. The prepared coating has good adhesion, is not easy to accumulate dirt, has better combustion resistance, tracking resistance, electric erosion resistance and mechanical property, and can degrade organic pollutants on the surface of the coating under the condition of natural illumination to realize the self-cleaning property of the surface of the coating.
In order to achieve the above object, one or more embodiments of the present invention provide the following technical solutions: an anti-pollution flashover coating with a surface layer self-cleaning function comprises:
base material: silicone resins modified with epoxy resins;
modified micro-nano particle size powder: silicon dioxide, aluminum hydroxide and titanium dioxide with different modified particle sizes;
and a dispersing solvent and an organic auxiliary agent.
One or more embodiments of the present invention provide the following technical solutions: a preparation method of an anti-pollution flashover coating with a surface layer self-cleaning function comprises the following steps:
step 1: mixing epoxy resin and organic silicon resin according to the mass ratio of 1: adding 7-10 parts of the mixture into butyl acetate or xylene solvent, adding KH550 silane coupling agent with the mass of 0.5% of that of the epoxy resin, heating in an oil bath, and stirring at low speed to obtain a base material for later use;
step 2: treating aluminum hydroxide with the particle size of 1.5-2.5 um, aluminum hydroxide with the particle size of 25-35 nm, titanium dioxide with the particle size of 2.5um, fumed silica with the particle size of 15-25 nm and silica with the particle size of 1.6-2.5 um by using the same coupling agent to obtain modified micro-nano particle size powder;
and step 3: adding the modified micro-nano particle size powder in the step 2 into butyl acetate containing a wetting dispersant or a xylene solvent containing the wetting dispersant according to a certain sequence and different percentages of the modified micro-nano particle size powder in the base material by mass for grinding and dispersing; wherein, the adding sequence of the modified micro-nano particle size powder and the mass ratio of the modified micro-nano particle size powder to the base material are as follows: fumed silica (20-25%) with the grain size of 15-25 nm, silica (10-15%) with the grain size of 1.6-2.5 um, aluminum hydroxide (15-20%) with the grain size of 25-35 nm, aluminum hydroxide (50-65%) with the grain size of 1.5-2.5 um and titanium dioxide (8-10%) with the grain size of 2.5um;
and 4, step 4: adding the base material obtained in the step 1 into the slurry dispersion liquid prepared in the step 3 after stirring, and stirring again;
and 5: adding an adhesion promoter accounting for 1-5 percent of the total mass of the coating, a flatting agent accounting for 0.5-0.8 percent of the total mass of the coating and a defoaming agent accounting for 0.6 percent of the total mass of the coating, stirring, filtering under negative pressure, standing and aging for use.
The above one or more technical solutions have the following beneficial effects:
(1) The epoxy resin is used for modifying the organic silicon resin, so that the base material not only keeps good adhesion of the epoxy resin, but also keeps excellent characteristics of the organic silicon resin.
(2) By combining organic silicon resin with low surface energy and matching micro-nano particle size powder materials, a well-constructed hydrophobic coating structure is not easy to accumulate dirt; the organic silicon resin without double bonds is used as a main base material and is combined with the addition of silicon dioxide, so that the ultraviolet irradiation resistance and the heat aging resistance of the coating are improved.
(3) The compatibility and combination of the silicon dioxide and the aluminum hydroxide with different modified particle sizes improve the combustion resistance, the tracking resistance, the electrical erosion resistance and the mechanical property of the coating.
(4) Due to the characteristics of the titanium dioxide, the addition of the titanium dioxide is not only beneficial to improving the weather resistance and the radiation resistance of the coating, but also can degrade organic pollutants on the surface of the coating under the natural illumination condition to realize the self-cleaning property of the surface of the coating.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The description which forms a part hereof is intended to provide a further understanding of the invention, and the illustrative embodiments and description of the invention are to be considered as illustrative of the invention and not restrictive thereof.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In one embodiment of the present invention, an anti-flashover coating having a surface layer self-cleaning function is provided, which comprises the following components:
base material: silicone resins modified with epoxy resins;
modified micro-nano particle size powder: silicon dioxide, aluminum hydroxide and titanium dioxide with different modified particle sizes;
and a dispersing solvent and an organic auxiliary agent.
Wherein, in the base material, the organic silicon resin or the fluorine silicon resin is modified by using epoxy resin, and the mass ratio of the epoxy resin to the organic silicon resin or the fluorine silicon resin is 1:7 to 10;
or KH550 silane coupling agent with the mass of 0.5 percent of the mass of the epoxy resin is also added into the base material;
or, the epoxy resin is one of E51 and E44;
or in the modified micro-nano particle size powder, the particle size of the modified silicon dioxide is 15 nm-25 nm and 1.6 um-2.5 um respectively; the particle size of the modified aluminum hydroxide is 1.5-2.5 um, 25-35 nm; the particle size of the modified titanium dioxide is 2.5um;
or, the dispersion solvent: adding butyl acetate of a wetting dispersant or adding a xylene solvent of the wetting dispersant;
or the mass of the dispersing solvent is 1.2 times of the sum of the mass of the base material and the mass of the modified micro-nano particle size powder.
The coupling agent used for modifying the modified micro-nano particle size powder is one of a silane coupling agent, a fluorosilane coupling agent and a titanate coupling agent.
The wetting dispersant is Tego 610S, BYK101, BYK110, preferably BYK110.
The organic auxiliary agent is one or more of an adhesion promoter, a flatting agent and a defoaming agent;
preferably, the adhesion promoter is BYK4510;
preferably, the leveling agent is BYK358N;
preferably, the defoamer is a combination of BYK054 and 066N.
In one embodiment of the present invention, a method for preparing an anti-pollution flashover coating material with a surface self-cleaning function is provided, which includes:
step 1: mixing epoxy resin and organic silicon resin according to the mass ratio of 1: adding 7-10 parts of the mixture into butyl acetate or xylene solvent, adding KH550 silane coupling agent with the mass being 0.5% of that of the epoxy resin, heating and stirring in an oil bath to obtain a base material for later use;
step 2: treating aluminum hydroxide with the particle size of 1.5-2.5 um, aluminum hydroxide with the particle size of 25-35 nm, titanium dioxide with the particle size of 2.5um, fumed silica with the particle size of 15-25 nm and silica with the particle size of 1.6-2.5 um by using the same coupling agent to obtain modified micro-nano particle size powder;
and step 3: respectively adding the modified micro-nano particle size powder in the step 2 into butyl acetate containing wetting dispersant or xylene solvent containing wetting dispersant according to a certain sequence and different mass percentages of the base materials for grinding and dispersing; wherein, the adding sequence of the modified micro-nano particle size powder is as follows in sequence: fumed silica with the particle size of 15-25 nm, silica with the particle size of 1.6-2.5 um, aluminum hydroxide with the particle size of 25-35 nm, aluminum hydroxide with the particle size of 1.5-2.5 um and titanium dioxide with the particle size of 2.5um; the percentage of each modified micro-nano particle size powder in the total mass of the base material is respectively as follows: fumed silica (20-25%) with the particle size of 15-25 nm, silica (10-15%) with the particle size of 1.6-2.5 um, aluminum hydroxide (15-20%) with the particle size of 25-35 nm, aluminum hydroxide (50-65%) with the particle size of 1.5-2.5 um and titanium dioxide (8-10%) with the particle size of 2.5um;
and 4, step 4: adding the base material obtained in the step 1 into the slurry dispersion liquid prepared in the step 3 under the condition of low-speed stirring, wherein the range of the low-speed stirring rotating speed is as follows: the linear velocity is 2.5 m/S-3.0 m/S, and the addition is finished within 5 min; after the adding is finished, the rotating speed is increased for stirring, and the range of the rotating speed for stirring is as follows: 8.0 m/S-10.0 m/S;
and 5: keeping the rotating speed unchanged, adding an adhesion promoter accounting for 1-5 percent of the total mass of the coating, a flatting agent accounting for 0.5-0.8 percent of the total mass of the coating and a defoaming agent accounting for 0.6 percent of the total mass of the coating, continuously stirring and dispersing for 3 hours, carrying out suction filtration under negative pressure, and standing and aging for at least 10 hours for use.
In some embodiments of the invention, in step 1, the oil bath is conditioned by a 50 ℃ constant temperature oil bath;
preferably, the stirring time is 2 hours;
preferably, the silicone resin is a fluorosilicone resin or a silicone rubber having no double bonds in the main chain and the side chain, and the molecular weight is generally about 3 ten thousand.
In some embodiments of the present invention, the epoxy resin and the silicone-based resin are mixed in a mass ratio of 1:7 to 10 percent of the total mass of the epoxy resin and the organic silicon resin is added into butyl acetate or xylene solvent, wherein the mass of the butyl acetate or xylene solvent is 10 to 20 percent of the total mass of the epoxy resin and the organic silicon resin.
In some embodiments of the present invention, in the step 2, one of a silane coupling agent, a fluorosilane coupling agent and a titanate coupling agent is used.
In some embodiments of the present invention, in step 3, adding butyl acetate containing wetting dispersant or xylene solvent containing wetting dispersant in a certain sequence and at different percentages of the mass of the base material for grinding and dispersing; wherein the addition amount of the wetting dispersant is 10-20% of the total mass of the modified micro-nano particle size powder. (ii) a The mass of the butyl acetate or the xylene solvent is 1.2 times of the sum of the mass of the base material and the mass of the modified micro-nano particle size powder.
In some embodiments of the invention, in the step 3, the added modified micro-nano particle size powder is subjected to ultrasonic treatment for 5 to 10min before being added; grinding and dispersing for 10min after all the modified micro-nano particle size powder is completely added.
In some embodiments of the present invention, in the step 4, the stirring time after the rotation speed is increased is 30min.
In some embodiments of the invention, in step 5, the sieved screen is 800 mesh.
In some embodiments of the present invention, in step 5, the pressure range of the negative pressure suction filtration is: 0.07MPa to 0.09MPa.
According to the invention, the epoxy resin is used for modifying the organic silicon resin, and the obtained base material not only keeps good adhesive of the epoxy resin, but also keeps excellent characteristics of the organic silicon resin; by combining organic silicon resin with low surface energy and matching micro-nano particle size powder materials, the hydrophobic coating structure with good structure is not easy to accumulate dirt.
According to the invention, the double-bond-free organic silicon resin is used as a main base material and combined with silicon dioxide, so that the ultraviolet illumination resistance and the heat aging resistance of the coating are improved; the matching use of the silicon dioxide and the aluminum hydroxide with different particle diameters improves the combustion resistance, the tracking resistance, the electrical erosion resistance and the mechanical property of the coating, and the addition of the titanium dioxide is beneficial to improving the weather resistance and the radiation resistance of the coating due to the characteristics of the titanium dioxide, and can degrade organic pollutants on the surface of the coating under the natural illumination condition to realize the self-cleaning property of the surface of the coating.
In the invention, fumed silica with the particle size of 15 nm-25 nm, silica with the particle size of 1.6 um-2.5 um, aluminum hydroxide with the particle size of 25 nm-35 nm, aluminum hydroxide with the particle size of 1.5 um-2.5 um and titanium dioxide with the particle size of 2.5um are sequentially added into a butyl acetate or xylene solvent containing a wetting dispersant for grinding and dispersing, and the advantages of the adding mode of the invention are that: the principle of difficult dispersion and prior dispersion is followed, in addition, the fumed silica can play a role in preventing sedimentation, large-particle-size powder is embedded into gaps of the powder in the dispersion process, the stability of the dispersion liquid is kept, and the formation of a strawberry-shaped structure is facilitated in the later coating preparation process.
The invention will be further explained and illustrated with reference to specific examples.
Example one
Step 1: blending resin;
adding 10g of E51 epoxy resin and 70g of organic silicon resin into 10g of butyl acetate solvent, simultaneously adding 0.05g of KH550 silane coupling agent, and then heating and stirring at a low speed for 2h under the condition of a constant-temperature oil bath at 50 ℃ to obtain base materials with high adhesive force to different base materials for later use;
step 2: preparing a powder material treated by a KH550 silane coupling agent in advance;
the method comprises the following steps: 40g of aluminum hydroxide with the micron particle size of 1.5-2.5 um, 12g of aluminum hydroxide with the nanometer particle size of 25-35 nm, 6.4g of titanium dioxide with the micron particle size of 2.5um, 16g of fumed silica with the nanometer particle size of 15-25 nm and 10g of silicon dioxide with the micron particle size of 1.6-2.5 um;
and step 3: sequentially and respectively adding the prepared different powder materials into a mixed solvent system of 197g of butyl acetate solvent and 5g of wetting dispersant according to the sequence of nano fumed silica, micron silica, nano aluminum hydroxide, micron aluminum hydroxide and micron titanium dioxide, and performing ultrasonic and grinding dispersion to obtain a slurry mixture; before adding each powder particle, carrying out ultrasonic treatment on the powder particles added in the front for 5-10 min, and after all the powder is completely ultrasonically dispersed, continuously grinding and dispersing for 10min by zirconium bead grinding;
and 4, step 4: stirring the blended resin prepared in the step 1 in a stirrer at a low speed of 800-1000 rpm, then slowly adding the slurry mixture prepared in the step 3, and after the slurry mixture is completely added, increasing the rotation speed of 2000-2500 rpm and stirring for 30min;
and 5: keeping the rotating speed unchanged, then adding 2.5g of adhesion promoter (BYK 4510), 2.2g of flatting agent (BYK 358N), 2.2g of defoaming agent (combination of BYK054 and 066N) and other organic auxiliary agents, and continuously stirring and dispersing for 3h to obtain the coating.
Step 6: and (3) performing negative pressure suction filtration on the prepared coating under the pressure of 0.08MPa through a 800-mesh filter screen, and then standing and aging for at least 10 h.
Example two
Step 1: blending resin;
adding 10g of E44 epoxy resin and 70g of organic silicon resin into 10g of xylene solvent, simultaneously adding 0.05g of KH550 silane coupling agent, and then heating and stirring at a low speed for 2 hours under the condition of a constant-temperature oil bath at 50 ℃ to obtain base materials with high adhesive force to different base materials for later use; wherein, the organic silicon resin adopts hydroxyl-terminated silicon rubber with a branched chain containing a benzene ring;
step 2: preparing a powder material treated by a titanate coupling agent in advance;
the powder material comprises: 45g of aluminum hydroxide with the micron particle size of 1.5-2.5 um, 12g of aluminum hydroxide with the nano particle size of 25-35 nm, 7g of titanium dioxide with the micron particle size of 2.5um, 18g of fumed silica with the nano particle size of 15-25 nm and 10g of silica with the micron particle size of 1.6-2.5 um;
and step 3: sequentially and respectively adding the prepared different powder materials into a mixed solvent system of 197g of butyl acetate solvent and 5g of wetting dispersant according to the sequence of nano fumed silica, micron silica, nano aluminum hydroxide, micron aluminum hydroxide and micron titanium dioxide, and performing ultrasonic and grinding dispersion to obtain a slurry mixture; before adding each powder particle, carrying out ultrasonic treatment on the added powder particles for 5-10 min, and after all the powder is completely ultrasonically dispersed, continuously grinding and dispersing for 10min by zirconium bead grinding;
the fourth step: stirring the blended resin prepared in the first step at a low speed of 800-1000 rpm in a stirrer; slowly adding the slurry dispersion liquid prepared in the step (3), and after the slurry dispersion liquid is completely added, increasing the rotating speed to 2000-2500 rpm and stirring for 30min;
the fifth step: keeping the rotating speed unchanged, then adding 2.0g of a substrate wetting agent (BYK 4510), 2.2g of a flatting agent (BYK 358N), 2.2g of an antifoaming agent (combination of BYK054 and 066N) and other organic auxiliaries, and continuously stirring and dispersing for 3 hours to obtain the coating.
And a sixth step: and (3) performing negative pressure suction filtration on the prepared coating under the pressure of 0.08MPa through a filter screen of 800 meshes, standing and aging for at least 10 hours, and then using the coating.
The prepared anti-pollution flashover coating is respectively sprayed on the surfaces of a glass sheet, a ceramic sheet and a tinplate sheet, relevant performances are tested, a thick sample is poured to test other performances, and the obtained results are as follows:
the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An anti-pollution flashover coating with a surface layer self-cleaning function is characterized by comprising the following components:
base material: silicone resins modified with epoxy resins;
modified micro-nano particle size powder: silicon dioxide, aluminum hydroxide and titanium dioxide with different modified particle sizes;
and a dispersing solvent and an organic auxiliary agent.
2. An anti-pollution flashover coating having a surface self-cleaning function according to claim 1, wherein: in the base material, the organic silicon resin or the fluorine-silicon resin is modified by using the epoxy resin, and the mass ratio of the epoxy resin to the organic silicon resin or the fluorine-silicon resin is 1:7 to 10;
or KH550 silane coupling agent with the mass of 0.5 percent of the mass of the epoxy resin is also added into the base material;
or, the epoxy resin is one of E51 and E44;
or in the modified micro-nano particle size powder, the particle size of the modified silicon dioxide is 15 nm-25 nm and 1.6 um-2.5 um respectively; the particle size of the modified aluminum hydroxide is 1.5-2.5 um, 25-35 nm; the particle size of the modified titanium dioxide is 2.5um;
or, the dispersion solvent: adding butyl acetate of a wetting dispersant or adding a xylene solvent of the wetting dispersant;
or in the dispersion solvent, the addition amount of the wetting dispersant is 10-20% of the total mass of the modified micro-nano particle size powder. (ii) a The mass of the butyl acetate or the xylene solvent is 1.2 times of the sum of the mass of the base material and the mass of the modified micro-nano particle size powder.
3. An anti-pollution flashover coating with a surface self-cleaning function as claimed in claim 2, wherein: the coupling agent for modification in the modified micro-nano particle size powder is one of a silane coupling agent, a fluorosilane coupling agent and a titanate coupling agent.
4. An anti-pollution flashover coating with a surface self-cleaning function as claimed in claim 2, wherein: the wetting dispersant is Tego 610S, BYK101, BYK110, preferably BYK110.
5. An anti-pollution flashover coating having a surface self-cleaning function according to claim 1, wherein: the organic auxiliary agent is one or more of an adhesion promoter, a flatting agent and a defoaming agent;
preferably, the adhesion promoter is BYK4510;
preferably, the leveling agent is BYK358N;
preferably, the defoamer is a combination of BYK054 and 066N.
6. A preparation method of an anti-pollution flashover coating with a surface layer self-cleaning function is characterized in that,
step 1: mixing epoxy resin and organic silicon resin according to the mass ratio of 1: adding 7-10 parts of the mixture into butyl acetate or xylene solvent, adding KH550 silane coupling agent with the mass of 0.5% of that of the epoxy resin, heating in an oil bath, and stirring at low speed to obtain a base material for later use;
and 2, step: treating aluminum hydroxide with the particle size of 1.5-2.5 um, aluminum hydroxide with the particle size of 25-35 nm, titanium dioxide with the particle size of 2.5um, fumed silica with the particle size of 15-25 nm and silica with the particle size of 1.6-2.5 um by using the same coupling agent to obtain modified micro-nano particle size powder;
and step 3: adding the modified micro-nano particle size powder in the step 2 into butyl acetate containing a wetting dispersant or a xylene solvent containing the wetting dispersant according to a certain sequence and different percentages of the modified micro-nano particle size powder in the base material by mass for grinding and dispersing; wherein, the adding sequence of the modified micro-nano particle size powder and the percentage of the total mass of the base material are respectively as follows: fumed silica (20-25%) with the particle size of 15-25 nm, silica (10-15%) with the particle size of 1.6-2.5 um, aluminum hydroxide (15-20%) with the particle size of 25-35 nm, aluminum hydroxide (50-65%) with the particle size of 1.5-2.5 um and titanium dioxide (8-10%) with the particle size of 2.5um;
and 4, step 4: adding the base material obtained in the step (1) into the slurry dispersion liquid prepared in the step (3) by stirring at a low speed, and then stirring again at a speed increased speed after the addition is finished;
and 5: adding an adhesion promoter accounting for 1-5 percent of the total mass of the coating, a flatting agent accounting for 0.5-0.8 percent of the total mass of the coating and a defoaming agent accounting for 0.6 percent of the total mass of the coating, stirring, filtering under negative pressure, standing and aging to obtain the coating.
7. The method for preparing an anti-pollution flashover coating with a surface self-cleaning function according to claim 6, wherein in the step 1, the oil bath is performed under a 50 ℃ constant temperature oil bath;
preferably, the stirring time is 2 hours;
preferably, the silicone resin is a fluorosilicone resin or a silicone rubber having no double bonds in the main chain and the branch chain.
8. The method for preparing the anti-pollution flashover coating with the surface layer self-cleaning function according to claim 6, wherein in the step 3, the added modified micro-nano particle size powder is subjected to ultrasonic treatment for 5-10 min before being added; grinding and dispersing for 10min after all the modified micro-nano particle size powder is completely added;
or in the step 3, the addition amount of the wetting dispersant is 10-20% of the total mass of the modified micro-nano particle size powder. (ii) a The mass of the butyl acetate or the xylene solvent is 1.2 times of the sum of the mass of the base material and the mass of the modified micro-nano particle size powder.
9. The method for preparing an anti-pollution flashover coating with a surface self-cleaning function as claimed in claim 6, wherein in the step 4, the increased-speed re-stirring time is 30min.
10. The method for preparing an anti-pollution flashover coating with a surface self-cleaning function as claimed in claim 6, wherein in the step 5, the filter screen of the negative pressure suction filtration is 800 meshes, and the standing time is more than 10 h.
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