CN102174280B - Bonded hydrophobic transfer agent - Google Patents
Bonded hydrophobic transfer agent Download PDFInfo
- Publication number
- CN102174280B CN102174280B CN 201110043214 CN201110043214A CN102174280B CN 102174280 B CN102174280 B CN 102174280B CN 201110043214 CN201110043214 CN 201110043214 CN 201110043214 A CN201110043214 A CN 201110043214A CN 102174280 B CN102174280 B CN 102174280B
- Authority
- CN
- China
- Prior art keywords
- transfer agent
- hydrophobic
- hydrophobic transfer
- rtv
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000002209 hydrophobic effect Effects 0.000 title claims abstract description 82
- 238000012546 transfer Methods 0.000 title claims abstract description 51
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 49
- 238000004073 vulcanization Methods 0.000 claims abstract description 8
- 238000000576 coating method Methods 0.000 claims description 39
- 239000011248 coating agent Substances 0.000 claims description 38
- -1 polysiloxane group Polymers 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical group [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 12
- 239000003431 cross linking reagent Substances 0.000 claims description 11
- 230000003373 anti-fouling effect Effects 0.000 claims description 10
- 239000000049 pigment Substances 0.000 claims description 9
- 229920001296 polysiloxane Polymers 0.000 claims description 9
- 239000002516 radical scavenger Substances 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000003054 catalyst Substances 0.000 claims description 6
- 229910021485 fumed silica Inorganic materials 0.000 claims description 6
- 239000012763 reinforcing filler Substances 0.000 claims description 6
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 5
- 125000003668 acetyloxy group Chemical group [H]C([H])([H])C(=O)O[*] 0.000 claims description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 3
- 239000011737 fluorine Substances 0.000 claims description 3
- 229910052731 fluorine Inorganic materials 0.000 claims description 3
- 239000013522 chelant Substances 0.000 claims description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 150000003606 tin compounds Chemical class 0.000 claims description 2
- 239000008199 coating composition Substances 0.000 claims 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 12
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 239000003973 paint Substances 0.000 abstract 4
- 238000012856 packing Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 29
- 238000013508 migration Methods 0.000 description 25
- 230000005012 migration Effects 0.000 description 25
- 238000011084 recovery Methods 0.000 description 16
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000000047 product Substances 0.000 description 8
- 230000032683 aging Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 239000012212 insulator Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229920002545 silicone oil Polymers 0.000 description 4
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000004817 gas chromatography Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 229910000077 silane Inorganic materials 0.000 description 3
- 125000001539 acetonyl group Chemical group [H]C([H])([H])C(=O)C([H])([H])* 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- AQPHBYQUCKHJLT-UHFFFAOYSA-N 1,2,3,4,5-pentabromo-6-(2,3,4,5,6-pentabromophenyl)benzene Chemical group BrC1=C(Br)C(Br)=C(Br)C(Br)=C1C1=C(Br)C(Br)=C(Br)C(Br)=C1Br AQPHBYQUCKHJLT-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000002262 Schiff base Substances 0.000 description 1
- 150000004753 Schiff bases Chemical class 0.000 description 1
- 229910002808 Si–O–Si Inorganic materials 0.000 description 1
- TVJPBVNWVPUZBM-UHFFFAOYSA-N [diacetyloxy(methyl)silyl] acetate Chemical compound CC(=O)O[Si](C)(OC(C)=O)OC(C)=O TVJPBVNWVPUZBM-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000007259 addition reaction Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000012844 infrared spectroscopy analysis Methods 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- SWGZAKPJNWCPRY-UHFFFAOYSA-N methyl-bis(trimethylsilyloxy)silicon Chemical compound C[Si](C)(C)O[Si](C)O[Si](C)(C)C SWGZAKPJNWCPRY-UHFFFAOYSA-N 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000003938 response to stress Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Landscapes
- Paints Or Removers (AREA)
Abstract
The invention relates to a chemical bond bonded RTV (room temperature vulcaniza-tion) anti-pollution flashover paint hydrophobic transfer agent. The hydrophobic transfer agent is bonded in a paint through chemical bonds; and when in use, the paint is stimulated by environmental factors, and the hydrophobic transfer agent is released to realize hydrophobic transfer. The bonded hydrophobic transfer agent is used for preparing the RTV anti-pollution flashover paint; and the performances such as mechanical properties, electrical properties, hydrophobicity and hydrophobicity losing and restoring property meet the national standards, and the hydrophobic transfer rate is lower than that of a physical packing hydrophobic transfer agent.
Description
Technical Field
The invention relates to a hydrophobic transfer agent used in RTV anti-pollution flashover coating, belonging to the field of high polymer materials.
Background
The RTV anti-pollution flashover coating is a preferred anti-pollution flashover coating for power transmission and transformation equipment of a power system due to the specific hydrophobicity, hydrophobic migration, excellent anti-pollution flashover characteristic, long-acting property, weather resistance, ozone resistance, maintenance-free property and the like. And after the RTV is coated on the surface of the insulator, the RTV is cured into a layer of rubber film at normal ambient temperature and is firmly connected with the surface of the insulator. It has strong hydrophobicity. After the RTV coating is coated, moisture on the surface of the insulator exists in the form of discontinuous isolated small water drops, and a continuous water film is not formed, so that the surface leakage current is limited, and the flashover voltage is improved.
The RTV anti-pollution flashover coating is room temperature vulcanized silicone rubber, and its components include extending filler, reinforcing filler, catalyst, cross-linking agent, non-cross-linking polysiloxane, etc. besides polysiloxane. The non-crosslinked siloxane slowly exudes during use, wraps the surface of the coating, contaminates the surface of the solid particles, and imparts hydrophobicity to the solid particles. This action is also called hydrophobic transfer.
The hydrophobic transfer agent of the RTV coating on the market is added in the coating kneading process and exists in the RTV coating in a physical embedding mode. The release is mainly driven by the diffusion force formed inside and on the surface of the coating and the migration towards the surface is realized. The diffusion force is only related to the diffusion coefficient, diffusion area and the like of the hydrophobic transfer agent, and the hydrophobic transfer agent can continuously migrate to the surface as long as the concentration difference exists between the interior and the surface of the coating, so that the consumption speed is high, and the migration speed is difficult to control artificially.
Since the service life of the coating is related to the consumption process of the hydrophobic transfer agent, it is a simple matter to extend the service life of the coating by as long as possible the consumption time of the hydrophobic transfer agent. Although it is a simple method to increase the content of the hydrophobic transfer agent, it is reported in the literature that simply increasing the content of the hydrophobic transfer agent to a certain extent has substantially no effect on the lifetime of the coating, and thus is not an effective method.
Disclosure of Invention
The invention aims to provide a bonding type hydrophobic transfer agent.
The bond-type hydrophobic transfer agent is linked to the vulcanized coating of the RTV coating through chemical bonds, and temporary chemical bonds which can be broken under the action of environmental factors exist between the hydrophobic transfer agent and the vulcanized coating. In general, the hydrophobic transfer agent does not release from the cured coating, and when environmental factors change, such as moisture penetration, temporary chemical bonds are acted upon, breaking them to release the hydrophobic transfer agent. Thus, the release of the hydrophobic transfer agent is controlled chemically and only under the influence of environmental factors, and correspondingly, the release rate of the hydrophobic transfer agent is slowed. As shown in the following formula, wherein the dotted line indicates a dissociable chemical bond, including ester bonds, schiff bases, and the like.
The bond type hydrophobic transfer agent containing ester bonds provided by the invention is shown as the following formula:
wherein,r is acetoxy CH3COO-, methoxy CH3O-, ketoximino MeEtCNO-, acylamidoAcMeN-, amino C6H11NH-, acetonyl H2C＝CMeO-；R1Si is a polysiloxane group or a fluorine-containing polysiloxane group
Wherein n is 1 to 4, R3Is CH3-or CF3-。
The synthetic route is as follows:
the typical structure is trimethoxy- ((3- (methyl-bis- (trimethylsiloxy) siloxy) propionyloxy) propyl) silane.
The hydrophobic transfer agent is a novel siloxane with an organic ester bond as the dissociable functional group. The ester bond is broken under the action of ambient moisture, and then the siloxane-bearing small-molecular organic acid is dissociated, which is shown in the following formula.
The occurrence of surface pollution flashover of insulators is often caused by the formation of a continuous water film by water. The ester bond is dissociated under the action of water to release micromolecular polysiloxane which is used as a hydrophobic transfer agent, so that the targeted stress response can be realized, and the useless consumption of the hydrophobic transfer agent is avoided.
The invention also provides RTV anti-pollution flashover coating containing the bonding type hydrophobic transfer agent, which also comprises hydroxyl-terminated polysiloxane, reinforcing filler, catalyst, crosslinking agent, hydrophobic transfer agent, silicon hydroxyl scavenger, vulcanization accelerator and pigment.
In the above-described aspect, more specifically,
the catalyst is organic tin compound or chelate.
The cross-linking agent is
Wherein R is4Is acetoxy CH3COO-, methoxy CH3O-, ketoximino MeEtCNO-, acylamidoAcMeN-, amino C6H11NH-, acetonyl H2C＝CMeO-；R5Is methyl CH3-or ethyl CH3CH2-。
The viscosity of the hydroxyl-terminated polysiloxane is 1000-100000 centipoises.
The reinforcing filler is fumed silica or precipitated silica with different specific surface areas.
The pigment is iron oxide red.
The electric arc resistant agent is decabromodiphenyl.
The hydrophobic transfer agent synthesized by the method is used for preparing RTV anti-pollution flashover coating, and the hydrophobic transfer rate of the hydrophobic transfer agent is slower than that of a physical embedding type hydrophobic transfer agent.
Drawings
Figure 1 gas chromatography analysis of comparative example leachate composition.
FIG. 2 gas chromatography analysis of leachate composition of example two.
Detailed Description
The first embodiment is as follows: synthesis of hydrophobic transfer agent
6.6g and 6g of gamma- (methacryloyloxy) propyltrimethoxysilane (a commercial product) and heptamethyltrisiloxane (a self-made product) are respectively put into a 50ml flask according to the mol ratio of 1.1: 1, 1ml of Pt-containing catalyst is added, the reaction is carried out on a magnetic stirrer at the temperature of 80 ℃ for 8 hours, and the flask is connected with a dryer to isolate water in the reaction process. And carrying out reduced pressure distillation on a product obtained by the reaction. Collecting components at 150-160 ℃ and 1-2 mmHg, wherein 10.81g of the components are obtained, and the yield is 90.1%. The product was chromatographically pure 97.23%. Infrared spectrum analysis of 1637cm of reactant gamma-allyloxypropyltrimethoxysilane-1Double bonds are absorbed and disappear in the product; 1076cm appeared in the product-1Characteristic absorption peaks of bending vibration products of Si-O-Si are observed, which are not observed in the reactant gamma-allyloxypropyltrimethoxysilane. This indicates that the addition reaction of double bonds and silicon-hydrogen bonds did occur during the reaction to give the designed addition product.
Comparative example:
the preparation process of the RTV anti-pollution flashover coating comprises the following steps: adding 107 glue, reinforcing filler, pigment, hydrophobic transfer agent and silicon hydroxyl scavenging agent into a planetary stirrer according to a formula ratio, heating to 120 ℃, mixing for 3 hours, vacuumizing for 2 hours, adding vulcanizing agent and cross-linking agent according to the formula ratio, mixing, vacuumizing again, adding solvent for dilution, taking out a finished product, sealing and packaging to obtain the RTV anti-pollution flashover coating.
The formula (in parts by mass) is as follows:
(1) hydroxyl-terminated silicone oil; 70 portions of
(2) Fumed silica; 7 portions of
(3) Organotin [ dibutyltin laurate ]; 0.3 part
(4) 10 portions of cross-linking agent [ WD-922, methyl tributyl ketoxime silane ]
(5) 2 portions of pigment iron oxide red
(6) 1 part of silicon hydroxyl scavenger
(7) 1 part of curing accelerator
(8) 30 parts of solvent toluene
Curing test: pouring the prepared RTV anti-pollution flashover coating into a polytetrafluoroethylene mold (the groove depth is 2mm), paving the coating in the mold, and placing the mold in a constant temperature and humidity box. Vulcanization conditions are as follows: and the relative humidity is 45-60% at 25 ℃. The tack free time and the full cure time of the coating were observed and recorded during the cure. The thickness after vulcanization is approximately 1.5 mm.
All indexes meet the requirements (the standard requirement is in parentheses) through experimental determination. Wherein the surface drying time is 45min (< 45min), and the complete curing time is < 24h (< 72 h).
After the sample is vulcanized, a test piece is obtained, and the appearance, the electrical property, the mechanical property and the hydrophobicity (including hydrophobicity, hydrophobicity loss and recovery and hydrophobic migration) are tested according to the standard DL/T627-2004 test.
The cured RTV coating has smooth and flat appearance, no bubble, no peeling and no cracking. The chemical resistance is good.
The tearing strength is 8.21kN/m, the standard (more than 3kN/m) is met, the shearing strength is 2MPa, and the standard (more than 0.8MPa) is met.
The dielectric strength is 21.26kV/mm, and the standard (> 18kV/mm) is met.
The hydrophobicity meets the standard. Wherein the hydrophobic HC grading value is grade 1 (grade 1-2); the hydrophobic loss grade value is 4-5 grades (1-2 grades) and is difficult to recover, and the hydrophobic mobility HC grade value is 4-5 grades (2-3 grades).
The hydrophobic migration aging test is not specified by a standard, but is crucial to the service life evaluation of the RTV coating.
The patent relates to a hydrophobic migration aging experiment, which performs hydrophobic migration aging for multiple times through an artificial high-temperature acceleration experiment, and evaluates the migration rate of a hydrophobic migration agent through the times of the hydrophobic migration aging experiment and the HC classification value recovery time of each time.
The test procedure was as follows: operating according to the hydrophobic migration test process, the diatomite is subjected to ash density of 1.0mg/cm2Uniformly brushing the mixture on the surface of a sample, standing at the constant temperature of 80 ℃ for 2 hours, testing the surface hydrophobicity by a spraying method, and determining the HC grading value. And if the recovery is difficult within 2h, prolonging the testing time until the final recovery HC value is 1-2, and prolonging the time for no more than 8 h.
And after the hydrophobicity is recovered each time, taking out the test piece, cleaning the diatomite on the surface, drying the test piece, coating the diatomite again, and repeating the test process. The water repellency (HC recovery to 1-2) of the test piece is not recovered within 8 h. The number of tests was recorded as the number of final tests, and the time of each recovery.
The samples did not exhibit hydrophobic migration properties. The hydrophobic migration aging test frequency is 0, and the recovery time is infinite.
Example two:
the preparation process and the comparative example are the same, but the formulation is different, and the bonding type hydrophobic transfer agent synthesized in the first example is added at the beginning.
The formula (in parts by mass) is as follows:
(1) hydroxyl-terminated silicone oil; 70 portions of
(2) Fumed silica; 7 portions of
(3) Organotin [ dibutyltin laurate ]; 0.3 part
(4) 10 portions of cross-linking agent [ WD-922, methyl tributyl ketoxime silane ]
(5) 10 portions of bonding type hydrophobic transfer agent
(6) 2 portions of pigment iron oxide red
(7) 1 part of silicon hydroxyl scavenger
(8) 1 part of curing accelerator
(9) 30 parts of solvent toluene
The curing test and performance test were the same as the control. The thickness after vulcanization is approximately 1.5 mm.
All indexes meet the requirements (the standard requirement is in parentheses) through experimental determination. Wherein the surface drying time is 45min (< 45min), and the complete curing time is < 24h (< 72 h).
After the sample is vulcanized, a test piece is obtained, and the appearance, the electrical property, the mechanical property and the hydrophobicity (including hydrophobicity, hydrophobicity loss and recovery and hydrophobic migration) are tested according to the standard DL/T627-2004 test.
The cured RTV coating has smooth and flat appearance, no bubble, no peeling and no cracking. The chemical resistance is good.
The tearing strength is 9.05kN/m, the standard (more than 3kN/m) is met, the shearing strength is 2MPa, and the standard (more than 0.8MPa) is met.
Dielectric strength 19.35kV/mm, meet the standard (> 18 kV/mm).
The hydrophobicity meets the standard. Wherein the hydrophobic HC grading value is grade 1 (grade 1-2); the hydrophobic loss grade value is 1-2 grade (1-2 grade), the recovery time is less than 12h (less than 24h), and the hydrophobic migration HC grade value is 4 grade (2-3 grade).
The test times of the second sample of the hydrophobic migration and aging test example are 2-3 times. The recovery time was about 10 hours. Compared with the control group, the composite material shows obvious hydrophobic migration performance and antifouling flashover performance.
Further, the vulcanized test piece was immersed in distilled water for 24 hours, and the composition of the extract was analyzed by gas chromatography, as compared with the control example. From the gas chromatogram of the extract, it can be seen that the test piece added with the hydrophobic transfer agent is soaked in distilled water, and then small molecular substances are separated out, while the comparative example is not. This indicates that there is indeed a breaking of the chemical bond and release of the hydrophobic transfer agent under the action of moisture.
Example three:
RTV anti-fouling flashover coating materials were prepared as in the comparative examples except that the bonding type hydrophobic transfer agent synthesized in example one was added.
The formula (in parts by mass) is as follows:
(1) hydroxyl-terminated silicone oil; 70 portions (the same in quality)
(2) Fumed silica; 7 portions of
(3) Organotin [ dibutyltin laurate ]; 0.3 part
(4) 10 portions of crosslinking agent [ WD-922, methyl triacetoxysilane ]
(5) 10 portions of bonding type hydrophobic transfer agent
(6) 2 portions of pigment iron oxide red
(7) 1 part of silicon hydroxyl scavenger
(8) 1 part of curing accelerator
(9) 30 parts of solvent toluene
The curing test and performance test were the same as the control examples. The thickness after vulcanization is approximately 1.5 mm.
All indexes meet the requirements (the standard requirement is in parentheses) through experimental determination. Wherein the surface drying time is 20min (< 45min), and the complete curing time is less than 24h (< 72 h).
After the sample is vulcanized, a test piece is obtained, and the appearance, the electrical property, the mechanical property and the hydrophobicity (including hydrophobicity, hydrophobicity loss and recovery and hydrophobic migration) are tested according to the standard DL/T627-2004 test.
The cured RTV coating has smooth and flat appearance, no bubble, no peeling and no cracking. The chemical resistance is good.
The tearing strength is 9.35kN/m, the standard (more than 3kN/m) is met, the shearing strength is 1.8MPa, and the standard (more than 0.8MPa) is met.
Dielectric strength 22.43kV/mm, meet the standard (> 18 kV/mm).
The hydrophobicity meets the standard. Wherein the hydrophobic HC grading value is grade 1 (grade 1-2); the hydrophobic loss grade value is 1-2 grade (1-2 grade), the recovery time is less than 12h (less than 24h), and the hydrophobic migration HC grade value is 3-4 grade (2-3 grade).
The test times of three samples of the hydrophobic migration and aging test example are 2-3 times. The recovery time was about 10 hours. Compared with the control group, the composite material shows obvious hydrophobic migration performance and antifouling flashover performance. This example also illustrates that synthetic hydrophobic transfer agents can be adapted to different cross-linking agents.
Example four:
RTV anti-fouling flashover coatings were prepared as in the control example except that different hydrophobic transfer agents were added.
The formula (in parts by mass) is as follows:
(1) hydroxyl-terminated silicone oil; 70 portions (the same in quality)
(2) Fumed silica; 7 portions of
(3) Organotin [ dibutyltin laurate ]; 0.3 part
(4) 10 portions of cross-linking agent [ WD-922, methyl tributyl ketoxime silane ]
(5) 2 portions of pigment iron oxide red
(6) 1 part of silicon hydroxyl scavenger
(7) 1 part of curing accelerator
(8) 30 parts of solvent toluene
(9) 8 portions of 3# white oil
The curing test and performance test were the same as the control examples. The thickness after vulcanization is approximately 1.5 mm.
All indexes meet the requirements (the standard requirement is in parentheses) through experimental determination. Wherein the surface drying time is 40min (< 45min), and the complete curing time is < 24h (< 72 h).
After the sample is vulcanized, a test piece is obtained, and the appearance, the electrical property, the mechanical property and the hydrophobicity (including hydrophobicity, hydrophobicity loss and recovery and hydrophobic migration) are tested according to the standard DL/T627-2004 test.
The cured RTV coating has smooth and flat appearance, no bubble, no peeling and no cracking. The chemical resistance is good.
The tear strength was 8.43kN/m, the standard (> 3kN/m) was met, the shear strength was 1.76MPa, the standard (> 0.8MPa) was met.
Dielectric strength 22.81kV/mm, meeting the standard (> 18 kV/mm).
The hydrophobicity meets the standard. Wherein the hydrophobic HC grading value is grade 1 (grade 1-2); the hydrophobic loss grade value is 2-3 grade (2-3 grade), the recovery time is less than 12h (less than 24h), and the hydrophobic migration HC grade value is 1-2 grade (2-3 grade).
The number of tests for the four samples in example was 6 to 7. The recovery time is 3-4 hours. Compared with the two phases of the example I, the two phases show a faster hydrophobic migration rate.
Conclusion
Firstly, an organopolysiloxane containing ester bonds, namely a hydrophobic transfer agent, is successfully synthesized by infrared spectroscopic analysis;
and the RTV coating containing the long-acting hydrophobic transfer agent shows certain hydrophobic migration performance.
Compared with the market products, the release speed of the synthesized hydrophobic transfer agent is slower than that of the common hydrophobic transfer agent white oil.
Claims (7)
1. A bonded hydrophobic transfer agent represented by the following formula:
wherein R is acetoxy CH3COO-, methoxy CH3O-, or ketoximino MeEtCNO-; r1-Si is a polysiloxane group or a fluorine-containing polysiloxane group; the polysiloxane group or fluorine-containing polysiloxane group is as follows:
wherein n =1 ~ 4, R3Is CH3-or CF3-。
2. An RTV anti-fouling flashover coating composition comprising the hydrophobic transfer agent of claim 1, further comprising a hydroxyl terminated polysiloxane, a reinforcing filler, a catalyst, a crosslinking agent, a silicon hydroxyl scavenger, a vulcanization accelerator, and a pigment.
3. The RTV anti-fouling flashover coating of claim 2, wherein: the catalyst is organic tin compound or chelate.
4. The RTV anti-fouling flashover coating of claim 2, wherein: the cross-linking agent is
Wherein R is4Is acetoxy CH3COO-, methoxy CH3O-, or ketoximino MeEtCNO-; r5Is methyl CH3-or ethyl CH3CH2-。
5. The RTV anti-fouling flashover coating of claim 2, wherein: the viscosity of the hydroxyl-terminated polysiloxane is 1000-100000 centipoises.
6. The RTV anti-fouling flashover coating of claim 2, wherein: the reinforcing filler is fumed silica or precipitated silica.
7. The RTV anti-fouling flashover coating of claim 2, wherein: the pigment is iron oxide red.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110043214 CN102174280B (en) | 2011-02-23 | 2011-02-23 | Bonded hydrophobic transfer agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110043214 CN102174280B (en) | 2011-02-23 | 2011-02-23 | Bonded hydrophobic transfer agent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102174280A CN102174280A (en) | 2011-09-07 |
| CN102174280B true CN102174280B (en) | 2013-08-21 |
Family
ID=44517546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110043214 Expired - Fee Related CN102174280B (en) | 2011-02-23 | 2011-02-23 | Bonded hydrophobic transfer agent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102174280B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102321434B (en) | 2011-08-19 | 2014-02-12 | 山西省电力公司晋城供电分公司 | RTV (room temperature vulcanized silicone rubber) anti-pollution flashover paint and preparation method thereof |
| CN105911442A (en) * | 2016-05-10 | 2016-08-31 | 国家电网公司 | Device of assessing RTV coating surface dirt retention capability |
| CN113667183A (en) * | 2021-08-19 | 2021-11-19 | 南京大学 | Hydrophobic migration agent for polyolefin plastic insulator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4781988A (en) * | 1986-09-29 | 1988-11-01 | Owens-Corning Fiberglas Corporation | Corrosion-resistant coating |
| CN101717607A (en) * | 2009-11-24 | 2010-06-02 | 刘晓强 | Preparation method of anti-pollution flashover coating suitable for coating live electrical equipment and anti-pollution flashover coating |
-
2011
- 2011-02-23 CN CN 201110043214 patent/CN102174280B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4781988A (en) * | 1986-09-29 | 1988-11-01 | Owens-Corning Fiberglas Corporation | Corrosion-resistant coating |
| CN101717607A (en) * | 2009-11-24 | 2010-06-02 | 刘晓强 | Preparation method of anti-pollution flashover coating suitable for coating live electrical equipment and anti-pollution flashover coating |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102174280A (en) | 2011-09-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104694004B (en) | Solvent-free anti-pollution flashover organic silicon coating and preparation method thereof | |
| CN102321434B (en) | RTV (room temperature vulcanized silicone rubber) anti-pollution flashover paint and preparation method thereof | |
| CN105623503B (en) | A kind of silicon rubber hydrophobic coating for insulator and preparation method thereof | |
| CN101735727B (en) | Anti-pollution flashover coating and preparation method thereof | |
| CN101787244B (en) | Antifouling flash insulator coating and preparation method thereof | |
| CN110305621B (en) | Dealcoholized room-temperature curing organosilicon sealant and preparation method thereof | |
| CN104974530B (en) | A kind of high-performance anti creepage trace silicon rubber and preparation method thereof | |
| CN106146850B (en) | Tackifier for addition type organic silicon impregnating resin and preparation method thereof | |
| CN108948359B (en) | Trapezoidal polysilsesquioxane containing phenyl and vinyl at same time and preparation method thereof | |
| CN102174280B (en) | Bonded hydrophobic transfer agent | |
| CA1245797A (en) | Silicone elastomers and adhesion promotor thereof | |
| CN106459664A (en) | Air-water barrier silicone coatings | |
| CN109251318B (en) | Oligomeric silsesquioxane modified solvent-free organic silicon resin and preparation method thereof | |
| CN104497579B (en) | One-component room temperature vulcanized organic silicon rubber with high adhesion and preparation method thereof | |
| JPH0548261B2 (en) | ||
| CN1654584A (en) | Surface modifiable organic silicon sealing adhesive and method for preparing same | |
| CN107641466B (en) | Organic silicon solvent-free impregnating varnish and preparation method thereof | |
| CN105368378A (en) | Silicone sealant with finishing capacity and preparation method of silicone sealant | |
| DE19625654A1 (en) | Crosslinkable organopolysiloxane compositions | |
| CN107189745A (en) | Environment-friendly type silane modified polyether coating glue and preparation method thereof | |
| Markides et al. | Cyanosilicones as stationary phases in gas chromatography: III. Synthesis, characterization and evaluation | |
| CN114907767B (en) | Antibacterial silicone rubber coating and preparation method thereof | |
| JP6911148B2 (en) | Crosslinkable population based on organopolysiloxane containing an organoloxy group | |
| CN103436028B (en) | Room temperature curing type one-component thermostable silica gel and preparation method thereof | |
| CN114752299A (en) | Solvent-free organosilicon polysiloxane resin flexible coating and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Yangzhou Chenhua Group Co., Ltd. Assignor: Wuhan University Contract record no.: 2012320000232 Denomination of invention: Bonded hydrophobic transfer agent License type: Exclusive License Open date: 20110907 Record date: 20120315 |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EM01 | Change of recordation of patent licensing contract |
Change date: 20150508 Contract record no.: 2012320000232 Assignee after: Yangzhou Chenhua New Materials Co., Ltd. Assignee before: Yangzhou Chenhua Group Co., Ltd. |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130821 Termination date: 20190223 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |