CN109575651A - A kind of super self-cleaning anti-pollution flashover coating of super-hydrophobic and its preparation process - Google Patents
A kind of super self-cleaning anti-pollution flashover coating of super-hydrophobic and its preparation process Download PDFInfo
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Abstract
The invention discloses a kind of preparation processes of the super self-cleaning anti-pollution flashover coating of super-hydrophobic, are related to coating technology field, include the following steps: that (1) prepares nanometer silicon dioxide particle；(2) acquisition of low-surface-energy nanometer silicon dioxide particle；(3) surface modification, coating of the invention use based on micro-nano inorganic material, and porous multistage multilayer structure makes it stablize, is wear-resisting.Although the migration characteristic of material influences its service life, DSAN material self-cleaning ability with super strength, the time for making material itself need to migrate with spread is shorter, and the small molecule and nano particle for needing to consume are few.It is not necessarily to be surface-treated insulator after the DSAN material lifetime phase, can directly spray again, it is non-maintaining in lifetime.
Description
Technical field
The present invention relates to coating technology fields, and in particular to a kind of preparation process of the super self-cleaning anti-pollution flashover coating of super-hydrophobic
And the coating prepared using the technique.
Background technique
Currently, electric system, which removes, uses traditional porcelain and glass insulator, it is relatively new, made of organic material
Silicone rubber kinds external insulation product (including composite insulator, RTV coating and creeping-increasing skirt) is also received to a certain extent, and just
Playing porcelain and the irreplaceable antifouling work effect of glass insulator.Composite insulator is as formal property product, it is considered that makes
It is 20~30 years with the service life, it is suitable with the projected life (30 years) of route and substation；And porcelain, the coating of glass insulator surface
Up to the present RTV, PRTV coating are still only used as remedial or provisional due to material property, construction technology etc. are many
Measure uses, and the service life time limit needs to be investigated always.
It is most of still to be configured using traditional porcelain insulating meanwhile on transformer equipment, heavy tune is climbed and cleaned
Run unit is left in work for or even the stage for being difficult to choose has been arrived in some new sites.In recent years " by exhausted outside the close configuration of saturated salt
The implementation of edge " technical policy fully relies on large distance porcelain insulating to reach configuration needed for transformer equipment and would be more difficult, simultaneously
Porcelain insulating coating PRTV etc. can only in most cases be constructed using the of short duration interruption maintenance time, by site operation
Condition influences, and there are problems that part mass.
China Patent Publication No. be CN106380945A disclose a kind of antifouling work super hydrophobic coating and preparation method thereof with
Using belonging to paint field, preparation method is specifically includes the following steps: (1) nano-silicon dioxide particle is added containing poly-
It is evenly dispersed to the nano-silicon dioxide particle in the organic solvent of dimethyl siloxane, after organic solvent volatilization
Low-surface-energy nano-silicon dioxide particle is made；(2) by low-surface-energy nano-silicon dioxide particle obtained in step (1) with
Binder is added in organic solvent, stirs and antifouling work super hydrophobic coating is made.This method process flow is simple, to equipment requirement
It is low, and raw material sources are extensive, low in cost, antifouling work super hydrophobic coating obtained excellent, resistance to ag(e)ing with hydrophobicity performance
Can be strong, selfreparing effect is good, pollution flashover voltage is high the advantages that, the external insulation for heavy fog haze area power transmission and transforming equipment protect.
China Patent Publication No. is that CN107760065A discloses a kind of super-hydrophobic filler grain for anti-pollution flashover coating
Method of modifying and application, include the following steps: 1) prepare filler grain dispersion liquid；2) ethyl alcohol of silicon fluoride coupling agent is prepared
Dispersion liquid, and the pH value for adjusting the alcohol dispersion liquid of silicon fluoride coupling agent is 3-5；3) into dispersion liquid obtained in step 2)
Silicon fluoride coupling agent is added, ultrasound is fully hydrolyzed fluorine silicone couplet, obtains fluorine silicone couplet solution, spare；It 4) will be to step
1) the fluorine silicone couplet solution prepared in step 3) is added in the dispersion liquid containing filler grain prepared in, heating stirring is anti-
It answers, filler grain surface is modified；5) by grinding after modified dry materials to get modified filler particle.The modification
Method is to carry out surface using filler grain of the fluorine containing silane coupling agent to anti-pollution flashover coating to be modified, and can make filler grain
Surface hydrophobic oleophylic, so that the hydrophobicity of coating improves, hydrophobic angle can reach 150 ° or more.
It is still a meta structure although above two coating is able to achieve water repelling anti-fouling function to a certain extent,
Hydrophobicity decline is obvious after surface abrasion, in addition, its hydrophobicity performance still has deficiency.
Summary of the invention
The purpose of the present invention is to provide a kind of preparation processes of the super self-cleaning anti-pollution flashover coating of super-hydrophobic, existing to solve
Caused drawbacks described above in technology.
The basic thought of super-hydrophobic biomimetic material preparation in the present invention are as follows: by being purposefully grafted in nanoparticle surface
The function chemoattractant molecule of variety classes and quantity is realized to self-assembly process, self assembly pattern and self-assembly size
Regulation, make self-assembly at the pattern of the similar single micro-meter scale protrusion of lotus leaf surface, and by nanoparticle from group
Dress body fixing base surface forms the compound coarse structure of multistage micro-scale.
A kind of preparation process of the super self-cleaning anti-pollution flashover coating of super-hydrophobic, includes the following steps:
(1) it prepares nanometer silicon dioxide particle: TEOS is dissolved in the mixing for obtaining dehydrated alcohol and TEOS in ethyl alcohol
Liquid, it is 5L's that the mixed liquor of TEOS and dehydrated alcohol, which are poured into, and are equipped with the capacity of electric stirring paddle, dropping funel and condenser
In flask, containing the ammonia spirit for according to distilled water and ammonium hydroxide volume ratio being 2:7 preparation in dropping funel, electric stirring is opened
Device opens simultaneously and adjusts the switch of dropping funel, and ammonia spirit is made uniformly to instill three-necked flask with the speed of 15mL/min,
Distilled water solution to ammonium hydroxide is added dropwise, and continues to stir 1h acquisition nano silicon dioxide sol, by nano silicon dioxide sol
Nano silica after the dry 22-26h in 115-125 DEG C of drying box, removing solvent and by-product are dried is solidifying
Glue filters by gel abrasive and with the sub-sieve of 300 mesh, obtains nano-silicon dioxide particle；
(2) acquisition of low-surface-energy nanometer silicon dioxide particle: by dimethyl silicone polymer and dibutyl tin dilaurate
It is added in the flask equipped with electric mixer, and n- heptane is added, and mechanical stirring 10 minutes, nano silica is added
Into the above mixed liquor, and mechanical stirring 15 minutes and vibration of ultrasonic wave 1min, it is dispersed in nano-silicon dioxide particle
In mixed liquor, at room temperature, the above system is statically placed in 36h, so that PDMS molecule is grafted to nano-silica surface, and make n-
Heptane volatilization, obtains low-surface-energy nano-silicon dioxide particle；
(3) it surface modification: disperses the anhydrous of 150ml at room temperature by low-surface-energy nano-silicon dioxide particle first
In ethyl alcohol, and ultrasonic wave disperses 3 minutes, and the dehydrated alcohol dispersion liquid of low-surface-energy nano-silicon dioxide particle is injected 500ml
Three-necked flask in, and system is placed in 58-62 DEG C of waters and carries out mechanical stirring, in mechanical agitation process, to system
The middle acid ultrapure water that aminopropyl triethoxysilane and 4-6ml is added, wherein acid ultrapure water is by adding in ultrapure water
Enter acetic acid and be adjusted to acquisition when pH value is 5, reaction system is kept into 2h, and mechanical stirring at 58-52 DEG C, keeps APTES molecule logical
The condensation reaction crossed between-OH group is grafted to low-surface-energy nano-silicon dioxide particle surface, obtains surface modification APTES's
Low-surface-energy nano-silicon dioxide particle dispersion liquid.
Preferably, the volume ratio of the mixed liquor of TEOS and dehydrated alcohol and TEOS is 3:35 in the step (1), described
The volume ratio of the mixed liquor of ammonia spirit and dehydrated alcohol and TEOS is 9:275.
Preferably, dimethyl silicone polymer, dibutyl tin dilaurate and nano silica in the step (2)
Mass ratio be 10:1:100, the dosage of the n- heptane is 50ml.
Preferably, nano silicon dioxide sol is dried for 24 hours in 120 DEG C of drying box in the step (1).
Preferably, in the step (3) low-surface-energy nano-silicon dioxide particle and aminopropyl triethoxysilane matter
Amount is than being 11:1, and the dosage of low-surface-energy nano-silicon dioxide particle is 5-6g, and the bath temperature is 60 DEG C.
The invention also discloses a kind of super self-cleaning anti-pollution flashover coating of super-hydrophobic (English names: DSAN), use above-mentioned work
Skill is made.
The present invention has the advantages that
(1) the present invention is based on the super-hydrophobic bionic principle designs of lotus leaf: first is that it is compound coarse to construct binary micro-nano in substrate
Body structure surface；Second is that low table is modified or deposited by chemically or physically method on the compound coarse structure surface of binary micro-nano
It face can substance.
(2) degrees experiment discovery, during water droplet pH value changes to 14 by 1, surface are carried out to DSAN coating
Contact angle is consistently greater than 150 °, and roll angle keeps showing that the both ultrahydrophobic has strong alkali-acid resistance compared with fractional value.Have
The super hydrophobic surface wear-resisting property of micro-nano diadactic structure is better than the super hydrophobic surface being made of nanometer or micrometer structure merely.
Micro-nano bi-unit composite structure is in wear process, and the nanostructure on micrometer structure top is frayed to be destroyed, and lower layer is not ground
The nanostructure of damage makes surface still keep super-hydrophobicity, and roll angle slightly increased, but is less than simple nanometer or micrometer structure
Super hydrophobic surface roll angle.
(3) composite contact face of the water droplet on super-hydrophobic coat is made of " liquid-solid " and " solution-air " contact surface, practical double
The contact area of super DSAN coating and water droplet only accounts for the 9% of the area in entire composite contact face, 91% composite contact area quilt
Air occupies.Coating roll angle of the invention is not more than 5 degree, and coating surface hardly shows drag interaction to water droplet, this
Excellent hydrophobicity performance is conducive to water droplet free movement, and this DSAN coating may be made to have anti-icing performance.
(4) coating of the invention self-cleaning property with super strength, water-ash mixing filth can not adhere on its surface, from dirt
Sample instants, that is, self-cleaning are extracted in liquid.
(5) in coating of the invention small organic molecule polysiloxanes to Nano-meter SiO_22Re-assemble and surface modification so that
Product theoretically has migration of hydrophobicity；Meanwhile warm-up movement or the effect of other external force promote have hydrophobic performance nanometer
The diffusion of grain vector product grieshoch, so that DSAN product has the migration of hydrophobicity performance for being much better than RTV.
(6) coating of the invention uses based on micro-nano inorganic material, and porous multistage multilayer structure makes it stablize, is wear-resisting.
Although the migration characteristic of material influences its service life, DSAN material self-cleaning ability with super strength needs material itself
The time of migration and diffusion is shorter, and the small molecule and nano particle for needing to consume are few.Without to exhausted after the DSAN material lifetime phase
Edge is surface-treated, and can directly be sprayed again, non-maintaining in lifetime.
Detailed description of the invention
Fig. 1 is the field emission scanning electron microscope on the nano silica super-hydrophobic coat surface of different amplification
Image.
Fig. 2 is shape of the water droplet on double super coatings.
Fig. 3 is the schematic diagram that composite contact face is observed with optical microscopy.
Fig. 4 is grieshoch and the microcosmic schematic diagram in DSAN coating composite contact interface.
Fig. 5 is roll angle schematic diagram.
Fig. 6 (a), (b), (c) are respectively RTV coating insulation, composite insulator, DSAN coating insulation in water-diatom
The surface characteristics after drying is extracted after impregnating 96 hours in native soiling solution.
Fig. 7 is self-cleaning test of the composite insulator after severe contamination, makes its clean surfaces, surface using spraying
Part has been converted into hydrophilic profile.
Fig. 8 is DSAN coating insulation, makes its surface contamination using manual type, its surface can be made by spraying water after dry
It is self-cleaning.
Fig. 9 is DSAN coating migration of hydrophobicity schematic diagram.
Figure 10 is the pictorial diagram of migration of hydrophobicity test one.
Figure 11 is the pictorial diagram of migration of hydrophobicity test two.
Figure 12 is the pictorial diagram of migration of hydrophobicity test three.
Specific embodiment
To be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Specific embodiment is closed, the present invention is further explained.
Embodiment 1
A kind of preparation process of the super self-cleaning anti-pollution flashover coating of super-hydrophobic, includes the following steps:
(1) it prepares nanometer silicon dioxide particle: the TEOS of 300mL is dissolved in the dehydrated alcohol for obtaining 3.5L in ethyl alcohol
With the mixed liquor of TEOS, the mixed liquor of TEOS and dehydrated alcohol is poured into, electric stirring paddle, dropping funel and condenser are installed
Capacity be in the flask of 5L, containing being ammonia spirit that 2:7 is prepared according to distilled water and ammonium hydroxide volume ratio in dropping funel,
Electric mixer is opened, opens simultaneously and adjusts the switch of dropping funel, make 180mL ammonia spirit with the speed of 15mL/min
Three-necked flask is uniformly instilled, the distilled water solution to ammonium hydroxide is added dropwise, continues to stir 1h acquisition nano silicon dioxide sol,
By nano silicon dioxide sol in 120 DEG C of drying box it is dry for 24 hours, remove solvent and by-product dried after nanometer
Silica dioxide gel filters by gel abrasive and with the sub-sieve of 300 mesh, obtains nano-silicon dioxide particle；
(2) acquisition of low-surface-energy nanometer silicon dioxide particle: by the dimethyl silicone polymer (PDMS) of 0.5g and
The dibutyl tin dilaurate (DBTD) of 0.05g is added in the flask equipped with electric mixer, and the n- heptane of 50ml is added,
And mechanical stirring 10 minutes, the nano silica of 5g is added in the above mixed liquor, and mechanical stirring 15 minutes and ultrasound
Wave shakes 1min, is dispersed in nano-silicon dioxide particle in mixed liquor, at room temperature, the above system is statically placed in 36h,
So that PDMS molecule is grafted to nano-silica surface, and n- heptane is made to volatilize, obtains low-surface-energy nanometer titanium dioxide silicon grain
Son；
(3) it surface modification: disperses 150ml at room temperature by the low-surface-energy nano-silicon dioxide particle of 5.5g first
Dehydrated alcohol in, and ultrasonic wave disperses 3 minutes, and the dehydrated alcohol dispersion liquid of low-surface-energy nano-silicon dioxide particle is infused
Enter in the three-necked flask of 500ml, and system is placed in 60 DEG C of waters and carries out mechanical stirring, in mechanical agitation process, to
The aminopropyl triethoxysilane (APTES) of 0.5g and the acid ultrapure water of 5ml are added in system, wherein acid ultrapure water is
It is adjusted to acquisition when pH value is 5 by the way that acetic acid is added in ultrapure water, reaction system is kept into 2h, and mechanical stirring at 60 DEG C,
So that APTES molecule is grafted to low-surface-energy nano-silicon dioxide particle surface by the condensation reaction between-OH group, obtains table
The low-surface-energy nano-silicon dioxide particle dispersion liquid of face modification APTES.
The invention also discloses the preparation methods of the insulator of application above-mentioned coating, further include following steps: cleaning is dry
Net insulator is immersed in the low-surface-energy nano-silicon dioxide particle dispersion liquid of surface modification APTES, then pulling film forming
Mode makes nano-silicon dioxide particle carry out self assembly in insulator surface, finally, plated film insulator is placed in 120 DEG C
20 minutes in baking oven, that is, obtain the insulator with silica super-hydrophobic coat.
Embodiment 2
Remaining is same as Example 1, the difference is that: the dosage of TEOS is 400ml in the step (1), by nanometer
Silicon dioxide gel dry 26h in 115 DEG C of drying box；Dimethyl silicone polymer dosage is 0.6g in the step (2),
The dosage of dibutyl tin dilaurate is 0.06g, and the dosage of nano silica is 6g, and the bath temperature is 58 DEG C, acid
Ultrapure water consumption is 6ml.
Embodiment 3
Remaining is same as Example 1, the difference is that: the dosage of TEOS is 350ml in the step (1), by nanometer
Silicon dioxide gel dry 22h in 125 DEG C of drying box；Dimethyl silicone polymer dosage is 0.4g in the step (2),
The dosage of dibutyl tin dilaurate is 0.04g, and the dosage of nano silica is 4g, and the bath temperature is 62 DEG C, acid
Ultrapure water consumption is 4ml.
Performance test:
1. pair super anti-pollution flashover coating microstructure
The Flied emission scanning electron that Fig. 1 show the nano silica super-hydrophobic coat surface of different amplification is aobvious
Micro mirror (FieldEmission-ScanningElectrodMicroscope, FE-SEM) image.
Find out in low power number SEM figure, the film of preparation is relatively flat smooth (Fig. 1 a).And the SEM of high magnification numbe is clearly shown
Porous structure (Fig. 1 b) out, and single nanoparticle size (Fig. 1 b-c) about between 40-100nm, the distribution of individual particle surface
Number nanoscale protrusions, constitute secondary structure.
Comparison diagram 1 (b) and (c), it can be seen that the microstructure characteristic phase of this microstructure characteristic and lotus leaf surface
Seemingly.Therefore, it is realized by nanoparticle surface self-assembly method and has " lotus leaf effect " institute in the preparation of common smooth glass surface
The target of the compound coarse structure of binary needed.
2. the performance of pair super anti-pollution flashover coating
The 2.1 pairs of super anti-pollution flashover coatings it is ultraphobic aqueous
Fig. 2 show shape of the water droplet on double super coatings, and water droplet is approximately spheroidal.The water droplet of actual measurement is double
For static contact angle on super coating between 160 ° to 170 °, static contact angle average value is 162 °.
Degrees experiment discovery is carried out to DSAN coating, during water droplet pH value changes to 14 by 1, surface is connect
Feeler is consistently greater than 150 °, and roll angle keeps showing that the both ultrahydrophobic has strong alkali-acid resistance compared with fractional value.
Super hydrophobic surface wear-resisting property with micro-nano diadactic structure, which is better than, to be made of nanometer or micrometer structure merely
Super hydrophobic surface.In wear process, the nanostructure on micrometer structure top is frayed to be destroyed micro-nano bi-unit composite structure,
And the unworn nanostructure of lower layer makes surface still keep super-hydrophobicity, roll angle slightly increased, but is less than and receives merely
The roll angle of the super hydrophobic surface of rice or micrometer structure.
DSAN prepares surface with the porous knot of multi-layer multi-stage using nano-silicon dioxide particle as filler, using spray coating method
The antifouling flash coating layer of structure.After the abrasion of the micro-scale of 10 μ N and the macro-mechanical abrasion of 10mN, although in DSAN coating table
The trace of abrasion is observed in face, but coating continues to keep good super-hydrophobic performance.Rigid silica particle and each interlayer
Electrostatic interaction plays the effect for improving coating machinery wear-resisting property.Meanwhile it being tested using paint film lattice drawing to super-hydrophobic coat
Adhesive force is tested, the results showed that coating surface does not occur obscission after drawing lattice.
The super self-cleaning of 2.2 pairs of super anti-pollution flashover coatings
Composite contact face of the water droplet on super-hydrophobic coat is made of " liquid-solid " and " solution-air " contact surface, practical double super
The contact area of DSAN coating and water droplet only accounts for the 9% of the area in entire composite contact face, and 91% composite contact area is empty
Gas occupies.
Fig. 3 show the schematic diagram with optical microscopy observation composite contact face.Clear zone is by light in water phase in Fig. 3
It is generated with the scattering at air phase interface, scattering of the dark space by light in air phase and solid phase interface produces, and clear zone accounts for entire multiple
Splice grafting touches the overwhelming majority of interface zone, this shows that many air are trapped within the composite contact interface of water droplet Yu DSAN coating,
Therefore entire compound interface area is mainly made of liquid-vapor interface.Double super DSAN coatings are placed in the objective table of optical microscopy
On, the light direction of optical microscopy is adjusted, microscopical observing pattern is adjusted to reflective.Gently by the water droplet of 10 μ L
Ground is placed on DSAN coating, adjusts optical microscopy focal length, until being clearly observed the compound of water droplet and DSAN coating
Contact interface.
Fig. 4 is grieshoch and the microcosmic schematic diagram in DSAN coating composite contact interface.The spy of the porous multilevel structure of DSAN coating
Point greatly reduces coating surface with grey contact surface, and has stomata barrier between dust and water-repellent layer nanostructure, makes dust
It is very faint with coating surface adhesive force.
When roll angle refers to that drop just rolls on the sloped surface, inclined surface is formed by with horizontal plane to be faced
Boundary's angle, is indicated with α.As shown, the critical state before reaching a kind of rolling when a drop water is placed on solid inclined surface
When, the inclined angle of the surface of solids is exactly roll angle.It can generally be used together with contact angle when super hydrophobic surface is characterized,
Roll angle is similar with contact angle, is the important method for characterizing a particular surface wetability.It is also a kind of common measurement material
Expect the method for surface wettability.
Measurement result shows double super DSAN coating roll angles no more than 5 degree, and coating surface hardly shows water droplet
Drag interaction, this excellent hydrophobicity performance are conducive to water droplet free movement, and this DSAN coating may be made to have anti-icing performance.
And water droplet contact angle on RTV silicone rubber coating is 120 ° or so, the maximum receding contact angle of test is 67 degree, roll angle
It is 53 degree, is much larger than DSAN coating.Although this illustrates that hydrophobicity is presented in RTV silicone rubber coating, this coating is once moistened
It is wet, stronger drag interaction will be shown to water droplet, thus the anti-icing performance of RTV silicone rubber coating is poor.
Fig. 6 (a), (b), (c) are respectively RTV coating insulation, composite insulator, DSAN coating insulation in water-diatom
The surface characteristics after drying is extracted after impregnating 96 hours in native soiling solution.Experiments have shown that for a long time under serious pollutional condition, RTV and
Compound inslation surface contamination is serious, and water-ash mixing is filthy in the affine attachment in silicone rubber coating surface, and DSAN coating is with super
Strong self-cleaning property, the mixing filth of water-ash can not adhere tos on its surface, the extraction sample instants, that is, self-cleaning from soiling solution.
Fig. 7 is self-cleaning test of the composite insulator after severe contamination, makes its clean surfaces, surface using spraying
Part has been converted into hydrophilic profile.Fig. 8 is DSAN coating insulation, makes its surface contamination using manual type, sprays water after dry
It can make its clean surfaces.During manually covering dirt, there is shrinkage phenomenon in filthy area after increasing in DSAN local humidity, this is special
Sign can not form discharge stem area with insulator surface, prevent pollution flashover.
The migration of hydrophobicity of 2.3 pairs of super anti-pollution flashover coatings
After migration of hydrophobicity refers to that insulator surface or coating are dirty, insulator surface or coating can hating itself
It is aqueous to move to filthy surface, so that filthy layer surface is also had hydrophobicity.In fact, the exactly migration of hydrophobicity of silicone rubber kinds coating
Property, just make the anti-pollution characteristic of silicon rubber synthetic insulators, RTV better than other materials.All super-hydrophobic paintings for not having this function
Material is only called self-cleaning coating and uses in insulator, cannot function as anti-pollution flashover coating use.
Domestic and foreign scholars not yet reach an agreement to silicon rubber migration of hydrophobicity mechanism at present, mainly there is following viewpoint.It is small
Molecular migration is theoretical, which thinks: when insulating surface is dirty, not with the small molecule siloxanes of other molecule intersecting chains from exhausted
Edge material internal is diffused into insulating materials surface, and diffuses further into filthy layer surface, and this transition process changes filth
The surface characteristic of layer makes its surface have hydrophobicity.Test analysis result of study shows, small molecule, hydrophobic are contained in dunghill
Extent of migration is higher；Short chain small molecule migration velocity is fast, and silicon rubber migration of hydrophobicity speed is fast, then aging speed is also fast.
Small organic molecule polysiloxanes is to Nano-meter SiO_2 in DSAN coating2Re-assemble and surface modification so that product manage
There is migration of hydrophobicity by upper；Meanwhile warm-up movement or the effect of other external force promote have hydrophobic performance nano particle vector product
The diffusion of grieshoch, so that DSAN product has the migration of hydrophobicity performance for being much better than RTV.
The adhesive force that migration of hydrophobicity is tested between one: DSAN coating and ash is very small, can not be dirty using leaching and brushing
Mode is defiled, we carry out covering dirt in such a way that artificial sieve falls diatomite, and normal temperature condition tests it after standing 96 hours
Migration of hydrophobicity, as shown in Figure 10.Water spray staging is determined as HC1 grades.The close ≈ 5mg/cm of test ash2。
Migration of hydrophobicity test two: soaking by spraying after covering dirt, and normal temperature condition stands 96 hours and tests its migration of hydrophobicity,
As shown in figure 11.Water spray staging is determined as HC1 grades.The close ≈ 20mg/cm of the equivalent ash of part dust thickness2。
Figure 12 is DSAN coating insulation and composite insulator migration of hydrophobicity comparative test, and in left figure, DSAN coating is exhausted
Edge it is spraying it is self-cleaning after, grey layer surface generates migration of hydrophobicity, is formed and is wrapped with filthy droplet, and part of droplet color is muddy
Turbid, part droplet color is limpid, illustrates that DSAN coating not only has migration of hydrophobicity effect during filthy moistened surface,
Also there is self-cleaning action.In right figure, composite insulator, which only generates migration of hydrophobicity, disperses droplet.
In conclusion DSAN coating, under natural conditions less, without rain after serious contamination, pollution layer surface can generate hydrophobic
Migration, the equivalent close thickness of ash of hydrophobicity reach 20mg/cm2, dirty thickness is effectively covered much larger than what composite insulator and RTV insulated
(about 1mg/cm2).Under the conditions of pollution layer soaks or rains, the migration of hydrophobicity of DSAN coating not only makes pollution layer generate hydrophobic
Property, also there is good self-cleaning, pollution layer is made to be detached from DSAN coating surface, DSAN coating directly carries out certainly under the action of rain, mist
It is clean.
The long-life of 2.4 pairs of super anti-pollution flashover coatings with it is non-maintaining
DSAN coating uses based on micro-nano inorganic material, and porous multistage multilayer structure makes it stablize, is wear-resisting.Although material
The migration characteristic of material influences its service life, but DSAN material self-cleaning ability with super strength, make material itself need migrate with
The time of diffusion is shorter, and the small molecule and nano particle for needing to consume are few.After the DSAN material lifetime phase without to insulator into
Row surface treatment, can directly spray again, non-maintaining in lifetime.
2.5 pairs of super anti-pollution flashover coatings and PRTV performance comparison
DSAN coating and PRTV performance comparison are as shown in table 1.
As known by the technical knowledge, the present invention can pass through the implementation of other essence without departing from its spirit or essential feature
Scheme is realized.Therefore, embodiment disclosed above, in all respects are merely illustrative, not the only.
All changes within the scope of the invention or within the scope equivalent to the present invention are included in the invention.
Claims (6)
1. a kind of preparation process of the super self-cleaning anti-pollution flashover coating of super-hydrophobic, which comprises the steps of:
(1) it prepares nanometer silicon dioxide particle: TEOS is dissolved in the mixed liquor for obtaining dehydrated alcohol and TEOS in ethyl alcohol, it will
The mixed liquor of TEOS and dehydrated alcohol pours into the flask for being equipped with that the capacity of electric stirring paddle, dropping funel and condenser is 5L
In, containing the ammonia spirit for according to distilled water and ammonium hydroxide volume ratio being 2:7 preparation in dropping funel, electric mixer is opened, together
When open and adjust the switch of dropping funel, so that ammonia spirit is uniformly instilled three-necked flask with the speed of 15mL/min, to ammonium hydroxide
Distilled water solution be added dropwise, continue stir 1h obtain nano silicon dioxide sol, by nano silicon dioxide sol in 115-
Dry 22-26h in 125 DEG C of drying box, remove solvent and by-product dried after nanometer titanium dioxide Silica hydrogel, by gel
It grinds and the sub-sieve of 300 mesh is used to filter, obtain nano-silicon dioxide particle；
(2) acquisition of low-surface-energy nanometer silicon dioxide particle: dimethyl silicone polymer and dibutyl tin dilaurate are added
In flask equipped with electric mixer, and n- heptane is added, and mechanical stirring 10 minutes, nano silica is added to above
In mixed liquor, and mechanical stirring 15 minutes and vibration of ultrasonic wave 1min, so that nano-silicon dioxide particle is dispersed in mixed liquor
In, at room temperature, the above system is statically placed in 36h, PDMS molecule is made to be grafted to nano-silica surface, and waves n- heptane
Hair obtains low-surface-energy nano-silicon dioxide particle；
(3) surface modification: first disperse low-surface-energy nano-silicon dioxide particle at room temperature the dehydrated alcohol of 150ml
In, and ultrasonic wave disperses 3 minutes, by the three of the dehydrated alcohol dispersion liquid injection 500ml of low-surface-energy nano-silicon dioxide particle
In mouth flask, and system is placed in 58-62 DEG C of waters and carries out mechanical stirring, in mechanical agitation process, added into system
Enter aminopropyl triethoxysilane and the acid ultrapure water of 4-6ml, wherein acid ultrapure water is by the way that vinegar is added in ultrapure water
Acid is adjusted to acquisition when pH value is 5, and reaction system is kept 2h, and mechanical stirring at 58-52 DEG C, and APTES molecule is made to pass through-OH
Condensation reaction between group is grafted to low-surface-energy nano-silicon dioxide particle surface, obtains the low surface of surface modification APTES
It can nano-silicon dioxide particle dispersion liquid.
2. a kind of preparation process of the super self-cleaning anti-pollution flashover coating of super-hydrophobic according to claim 1, it is characterised in that: described
In step (1) volume ratio of the mixed liquor of TEOS and dehydrated alcohol and TEOS be 3:35, the ammonia spirit and dehydrated alcohol and
The volume ratio of the mixed liquor of TEOS is 9:275.
3. a kind of preparation process of the super self-cleaning anti-pollution flashover coating of super-hydrophobic according to claim 2, it is characterised in that: described
The mass ratio of dimethyl silicone polymer, dibutyl tin dilaurate and nano silica is 10:1:100, institute in step (2)
The dosage for stating n- heptane is 50ml.
4. a kind of preparation process of the super self-cleaning anti-pollution flashover coating of super-hydrophobic according to claim 3, it is characterised in that: described
Nano silicon dioxide sol is dried for 24 hours in 120 DEG C of drying box in step (1).
5. a kind of preparation process of the super self-cleaning anti-pollution flashover coating of super-hydrophobic according to claim 4, it is characterised in that: described
The mass ratio of low-surface-energy nano-silicon dioxide particle and aminopropyl triethoxysilane is 11:1, and low surface in step (3)
The dosage of energy nano-silicon dioxide particle is 5-6g, and the bath temperature is 60 DEG C.
6. a kind of super self-cleaning anti-pollution flashover coating of super-hydrophobic, it is characterised in that: use technique of any of claims 1-5
It is made.
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| CN111532373A (en) * | 2020-05-08 | 2020-08-14 | 山东交通学院 | Preparation method of super-icephobic coating for ship deck deicing |
| CN112044718A (en) * | 2020-09-09 | 2020-12-08 | 哈尔滨工业大学 | Preparation method of long-acting, strong and corrosion-resistant super-hydrophobic coating on metal surface |
| CN113462120A (en) * | 2021-08-20 | 2021-10-01 | 深圳市鑫俊通科技有限公司 | Self-cleaning silica gel keyboard key and preparation method thereof |
| CN115704191A (en) * | 2021-08-17 | 2023-02-17 | 美盈森集团股份有限公司 | Moisture-proof coating liquid, preparation method and corrugated case |
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