CN116496695A - Insulating coating material for high-voltage transmission line and preparation method thereof - Google Patents
Insulating coating material for high-voltage transmission line and preparation method thereof Download PDFInfo
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- CN116496695A CN116496695A CN202310489816.4A CN202310489816A CN116496695A CN 116496695 A CN116496695 A CN 116496695A CN 202310489816 A CN202310489816 A CN 202310489816A CN 116496695 A CN116496695 A CN 116496695A
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- insulating coating
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- 239000000463 material Substances 0.000 title claims abstract description 69
- 239000011248 coating agent Substances 0.000 title claims abstract description 61
- 238000000576 coating method Methods 0.000 title claims abstract description 61
- 230000005540 biological transmission Effects 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 68
- -1 polydimethylsiloxane Polymers 0.000 claims abstract description 53
- 239000004205 dimethyl polysiloxane Substances 0.000 claims abstract description 52
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 38
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910021485 fumed silica Inorganic materials 0.000 claims abstract description 36
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 19
- 239000003054 catalyst Substances 0.000 claims abstract description 15
- 239000007822 coupling agent Substances 0.000 claims abstract description 15
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 15
- 239000006229 carbon black Substances 0.000 claims abstract description 14
- 239000006185 dispersion Substances 0.000 claims description 38
- 238000006243 chemical reaction Methods 0.000 claims description 36
- 238000003756 stirring Methods 0.000 claims description 22
- 230000035484 reaction time Effects 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 8
- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 claims description 7
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 claims description 6
- 239000000084 colloidal system Substances 0.000 claims description 6
- 239000012975 dibutyltin dilaurate Substances 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 4
- ISKQADXMHQSTHK-UHFFFAOYSA-N [4-(aminomethyl)phenyl]methanamine Chemical compound NCC1=CC=C(CN)C=C1 ISKQADXMHQSTHK-UHFFFAOYSA-N 0.000 claims description 4
- PHQOGHDTIVQXHL-UHFFFAOYSA-N n'-(3-trimethoxysilylpropyl)ethane-1,2-diamine Chemical compound CO[Si](OC)(OC)CCCNCCN PHQOGHDTIVQXHL-UHFFFAOYSA-N 0.000 claims description 4
- SJECZPVISLOESU-UHFFFAOYSA-N 3-trimethoxysilylpropan-1-amine Chemical compound CO[Si](OC)(OC)CCCN SJECZPVISLOESU-UHFFFAOYSA-N 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- MQWFLKHKWJMCEN-UHFFFAOYSA-N n'-[3-[dimethoxy(methyl)silyl]propyl]ethane-1,2-diamine Chemical compound CO[Si](C)(OC)CCCNCCN MQWFLKHKWJMCEN-UHFFFAOYSA-N 0.000 claims description 3
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 claims description 3
- 229910002011 hydrophilic fumed silica Inorganic materials 0.000 claims description 2
- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical compound [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 4
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 4
- 239000001257 hydrogen Substances 0.000 abstract description 4
- 239000013008 thixotropic agent Substances 0.000 abstract description 2
- 238000013329 compounding Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 24
- 239000003292 glue Substances 0.000 description 9
- 238000001125 extrusion Methods 0.000 description 8
- 230000009974 thixotropic effect Effects 0.000 description 8
- 229920002125 Sokalan® Polymers 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 5
- 239000011810 insulating material Substances 0.000 description 4
- 238000007665 sagging Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 206010013642 Drooling Diseases 0.000 description 2
- 208000008630 Sialorrhea Diseases 0.000 description 2
- 125000003545 alkoxy group Chemical group 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- AMTWCFIAVKBGOD-UHFFFAOYSA-N dioxosilane;methoxy-dimethyl-trimethylsilyloxysilane Chemical compound O=[Si]=O.CO[Si](C)(C)O[Si](C)(C)C AMTWCFIAVKBGOD-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000011837 pasties Nutrition 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229940083037 simethicone Drugs 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
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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
-
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
- Organic Insulating Materials (AREA)
Abstract
The invention discloses an insulating coating material for a high-voltage transmission line and a preparation method thereof, wherein the insulating coating material comprises the following components in parts by weight: 40-60 parts of 20000cst trimethoxy end-capped polydimethylsiloxane, 30-50 parts of 2000cst trimethoxy end-capped polydimethylsiloxane, 10-20 parts of 100cst methyl silicone oil, 8-12 parts of fumed silica, 3-6 parts of nano calcium carbonate, 0.2-0.5 part of carbon black, 3-5 parts of cross-linking agent, 0.5-1.5 parts of coupling agent and 0.1-0.25 part of catalyst, and the fumed silica can form a hydrogen bond with the polar group of the end-capped polydimethylsiloxane to form a complex three-dimensional network structure by compounding the high-viscosity and low-viscosity trimethoxy end-capped polydimethylsiloxane and taking the fumed silica as a thixotropic agent, so that the fluidity is reduced and the consistency is increased; the insulating coating material prepared by the invention has the advantages of excellent insulating property, high mechanical property, good extrudability, high consistency, strong touch, no flowing and good storability.
Description
Technical Field
The invention relates to the technical field of insulating materials, in particular to an insulating coating material for a high-voltage transmission line and a preparation method thereof.
Background
At present, many 10KV, 35KV and 66KV power transmission lines of a power grid in China are overhead bare conductors, often penetrate through areas such as water areas, forest meadows, residential areas, roads and construction sites, are limited in erection height, easily cause safety accidents such as personal accidental electric shock and short-circuit fire of trees, and seriously influence the safe operation of the power grid. The national power grid and southern power grid company are required to perform insulation treatment on the risk line by a sequential outgoing policy. The conventional insulation treatment mode is to remove the bare conductor and replace the bare conductor with a transmission line with an insulation layer, or to remove the overhead line and replace the overhead line with a buried cable. Both methods need power failure construction, and have the advantages of complex engineering, long period and high cost. Therefore, in order to solve the above-mentioned problems, there is a new technology of coating a bare wire with an insulating material by using a coating robot on-line, and achieving the same insulating effect as XLPE insulating wires after curing. The insulating material is a single-component normal-temperature curing material generally, has good insulativity, weather resistance and elasticity, is pasty without flowing, is extruded and discharged through a robot piston charging barrel, is uniformly coated on a wire through a die head assembly to form a coating with the thickness of 2-5mm, and is self-cured by contacting air to form a rubber layer.
The coating material is not only required to satisfy basic electrical, mechanical and weather resistance, but also to consider the use process thereof, in particular extrusion and thixotropic properties. The extrudability determines the amount of thrust force used to extrude a certain amount of material per unit time, an indicator that has a great influence on the mechanical design of the coating robot. The insulating glue on the market is various, the product has no unified standard, the extruding performance of the insulating glue of different manufacturers is quite different, and when the pushing pressure is actually tested, the fact that the pushing force of different insulating glue is sometimes doubled or even doubled is found, so that if the coating robot selects the insulating glue which is not matched with the design of the coating robot, the coating robot can be seriously damaged due to overlarge pushing force. According to the test and calculation, taking a normal coating robot on the market as an example, a single material cylinder or a double material cylinder is generally used, the diameter of the material cylinder is 12-18cm, the length of the material cylinder is 40-45cm, and a plastic bag is placed in the material cylinder for packaging the glue, and the glue is generally 4-9Kg. If the insulating adhesive with better extrudability is the insulating adhesive, the discharging pressure for achieving the normal coating dosage is 0.5-1MPa, and the conversion is about 10000-20000N in terms of thrust; in the case of an insulating paste having poor extrudability, the pushing force is required to be about 30000N at the maximum in the same case. Such high thrust forces pose a great challenge to both the mechanical structure and the motor of the robotic device. On the other hand, coating robots generally have very severe weight requirements, because of the bearing capacity of the transmission lines, and the empty weight of the robot is generally designed to be within 50 Kg. If the device is to safely output 20000N thrust, the pushing mechanism needs to use a thicker metal structure and a larger motor, and the weight of the pushing mechanism and the lifting mechanism can be increased synchronously. If only 10000N of thrust is required to be output, the pushing mechanism can be made lighter and thinner, the motor is smaller, the weight of other mechanisms can be correspondingly reduced, the whole machine is reduced by 20-30% approximately, and the pushing mechanism has great benefits on weight reduction and operation safety of equipment. On the other hand, the glue is applied to the wire in a thickness of 2-5mm without any sagging or sagging, and it is required that the glue has strong thixotropic properties and a large consistency. The viscosity of the material is generally reduced in order to obtain higher extrudability, but the reduced viscosity often means that the flowability of the glue is increased, i.e. the consistency and thixotropy are reduced, and may easily sag or flow after application. Therefore, the adhesive used for insulating coating of the power transmission line must have both extrudability and thixotropic property, i.e. the insulating adhesive has the characteristics of high extrudability, strong touch and high consistency through the formula and the process.
The patent with publication No. CN111057465A discloses an insulating coating material cured at room temperature and a preparation method thereof, wherein the insulating coating material comprises alpha, omega-dihydroxypolydimethylsiloxane, polypropylene, simethicone, filler, cross-linking agent, coupling agent, catalyst and pigment, the alpha, omega-dihydroxypolydimethylsiloxane has the viscosity of 1000-600000cst, and can keep good thixotropic property without sagging and sagging under the action of shearing force, but the extrusion property and the thixotropy are not considered, and the problem of storage resistance of the insulating coating material is not considered.
Disclosure of Invention
Aiming at the problems of extrusion, thixotropic property and consistency of the insulating coating material in the prior art, the invention aims to provide the insulating coating material for the high-voltage transmission line and a preparation method thereof, and solves the technical problems that the extrusion property, high consistency and high thixotropic property of the existing insulating material cannot be taken into consideration.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in one aspect, the invention provides an insulating coating material for a high-voltage transmission line, which comprises the following components: trimethoxy end-capped polydimethylsiloxane, methyl silicone oil, fumed silica, nano calcium carbonate, carbon black, a cross-linking agent, a coupling agent and a catalyst;
the end-capped polydimethylsiloxane of 2000cs is smaller in molecule, more alkoxy groups or hydroxyl groups are carried by the same mass, more hydrogen bonds are formed with fumed silica, so that the thixotropy and the consistency are higher, and the 20000cs end-capped polydimethylsiloxane provides better mechanical properties;
further preferably, the trimethoxy terminated polydimethylsiloxane comprises trimethoxy terminated polydimethylsiloxane having a viscosity of 2000cst and trimethoxy terminated polydimethylsiloxane having a viscosity of 20000 cst;
further preferably, the fumed silica is hydrophilic fumed silica having a specific surface area of 150 to 200m 2 /g。
Further preferably, the viscosity of the methyl silicone oil is 100cst.
Further preferably, the composition comprises the following components in parts by weight: 20000cst trimethoxy end-capped polydimethylsiloxane 40-60 parts, 2000cst trimethoxy end-capped polydimethylsiloxane 30-50 parts, 100cst methyl silicone oil 10-20 parts, fumed silica 8-12 parts, nano calcium carbonate 3-6 parts, carbon black 0.2-0.5 parts, cross-linking agent 3-5 parts, coupling agent 0.5-1.5 parts and catalyst 0.1-0.25 parts.
Further preferably, the composition comprises the following components in parts by weight: 20000cst trimethoxy end-capped polydimethylsiloxane 45-55 parts, 2000cst trimethoxy end-capped polydimethylsiloxane 40-45 parts, 100cst methyl silicone oil 10-15 parts, fumed silica 9-10 parts, nano calcium carbonate 4-5 parts, carbon black 0.3-0.4 parts, cross-linking agent 4-4.5 parts, coupling agent 1-1.5 parts and catalyst 0.15-0.2 parts.
Further preferably, the cross-linking agent is one or more of methyltrimethoxysilane or methyltriethoxysilane.
Further preferably, the coupling agent is one or more of gamma-aminopropyl triethoxysilane, gamma-aminopropyl trimethoxysilane, N- (beta-aminoethyl) -gamma-aminopropyl trimethoxysilane and N- (beta-aminoethyl) -gamma-aminopropyl methyldimethoxysilane.
Further preferably, the catalyst is one or more of dibutyl tin dilaurate, stannous octoate and dibutyl tin diacetate.
In another aspect, the present invention also provides a method for preparing the insulating coating material for high voltage transmission lines according to the first aspect, comprising the following steps:
step 1, placing fumed silica and nano calcium carbonate in an oven for drying for 2-4 hours; then evenly mixing 20000cst trimethoxy end-capped polydimethylsiloxane, 2000cst trimethoxy end-capped polydimethylsiloxane, 100cst methyl silicone oil, carbon black and nano calcium carbonate, dispersing and stirring;
step 2, adding the fumed silica into the reaction in the step 1 for 3 times, dispersing and stirring after each addition, and then carrying out the next addition;
step 3, vacuumizing, dispersing and stirring, wherein circulating water is used in the process, and the temperature of the materials in the cylinder is controlled to be less than or equal to 55 ℃;
step 4, adding the cross-linking agent, the coupling agent and the catalyst in sequence, dispersing and stirring after each addition, and then carrying out the next addition;
and 5, stopping dispersing, discharging bubbles in the colloid, discharging and rapidly sealing and packaging when the temperature of the material is reduced to below 40 ℃ to obtain the insulating coating material.
Further preferably, the reaction conditions in step 1 are a baking temperature of 105 to 120 ℃, a revolution speed of 8 to 10rpm, a dispersion speed of 10 to 15Hz, and a reaction time of 5 to 10min.
It is further preferable that the reaction conditions in the step 2 are revolution speed of 2 to 5rpm, dispersion speed of 5 to 10Hz, and reaction time of 5 to 10min.
Further preferably, the reaction condition in the step 3 is that the vacuum degree is controlled below-0.08 MPa, revolution speed of 6-10 rpm, dispersion speed of 20-25 Hz, and reaction time is 30-40min.
Further preferably, the reaction condition of the crosslinking agent in the step 4 is revolution speed of 8-10 rpm, dispersion speed of 25-30 Hz, and reaction time is 15-20min; the reaction condition of the coupling agent is revolution speed of 10-15 rpm, dispersion speed of 25-30 Hz, and reaction time is 10-15min; the reaction condition of the catalyst is revolution speed of 10-15 rpm, dispersion speed of 25-30 Hz, and reaction time is 6-10min.
Compared with the prior art, the insulating coating material for the high-voltage transmission line and the preparation method thereof have the following beneficial effects:
(1) The invention uses trimethoxy end-capped polydimethylsiloxane with high viscosity and low viscosity to match with each other, 20000cst end-capped polydimethylsiloxane provides better mechanical property, 2000cst end-capped polydimethylsiloxane provides high extrusion property and high consistency, and the insulating adhesive product performance is more suitable for automatic coating of a robot through specific proportion mixing;
(2) The invention also uses the fumed silica as thixotropic agent, and forms a hydrogen bond with polar groups of the end-capped polydimethylsiloxane through the large specific surface area and the carried large number of hydroxyl groups, thereby forming a complex three-dimensional network structure, reducing the fluidity and increasing the consistency; 2000cst end-capped polydimethylsiloxane, which has smaller molecules, has more alkoxy or hydroxyl groups carried by the same mass, and more hydrogen bonds with fumed silica, thus having higher thixotropic properties and consistencies;
(3) The insulating coating material prepared by the invention has the advantages of excellent insulating property, high mechanical property, good extrusion property, high consistency, strong touch, no flowing and good storability.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a sample of an insulating coating material according to example 1 of the present invention;
fig. 2 is a sample of the insulating coating material of comparative example 7 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will clearly and fully describe the technical aspects of the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
Example 1
An insulating coating material for high-voltage transmission lines comprises the following components: 20000cst trimethoxy terminated polydimethylsiloxane 50kg, 2000cst trimethoxy terminated polydimethylsiloxane 40kg, 100cst methyl silicone oil 10kg, fumed silica of carbopol LM150 kg, nano calcium carbonate of particle size 100nm Bai Cuihua CC801 5kg, carbon black of carbopol MOGULL0.3 kg, methyltrimethoxysilane 4kg, N- (beta-aminoethyl) -gamma-aminopropyl trimethoxysilane 1kg, and dibutyl tin dilaurate 0.15kg.
The preparation method comprises the following steps:
step 1: placing the fumed silica and the nano calcium carbonate in an oven at 105 ℃ for drying for 4 hours; 20000cst trimethoxy end-capped polydimethylsiloxane, 2000cs trimethoxy end-capped polydimethylsiloxane, 100cs methyl silicone oil, carbon black and nano calcium carbonate are added into a reaction kettle of a planetary mixer, and are stirred for 5min at revolution speed of 10rpm and dispersion speed of 10 Hz;
step 2: adding the fumed silica into the reaction kettle for 3 times, stirring for 5min at revolution speed of 5rpm and dispersion speed of 10Hz after each addition, and adding the fumed silica again;
step 3: after all the fumed silica is added and stirred into colloid, the reaction kettle is vacuumized to-0.09 MPa, and stirred for 30min at revolution speed of 8rpm and dispersion speed of 20Hz, wherein circulating water is used in the process, and the material temperature is controlled to be 52 ℃;
step 4: adding methyltrimethoxysilane into a reaction kettle, and stirring for 20min at a revolution speed of 10rpm and a dispersion speed of 25 Hz; adding N- (beta-aminoethyl) -gamma-aminopropyl trimethoxysilane into a reaction kettle, and stirring at revolution speed of 15rpm and dispersion speed of 25Hz for 10min; adding dibutyl tin dilaurate into a reaction kettle, stirring for 7min at revolution speed of 15rpm and dispersion speed of 30Hz, vacuum degree in the process reaching-0.09 MPa, and controlling material temperature to be 52 ℃;
step 5: the dispersion was stopped, and the gel was stirred at a slow speed of revolution at 2rpm for 8 minutes to discharge bubbles. And when the temperature of the material is reduced to 38 ℃, discharging, rapidly sealing and packaging to obtain the insulating coating material.
Example 2
An insulating coating material for high-voltage transmission lines comprises the following components: 20000cst trimethoxy terminated polydimethylsiloxane 60kg, 2000cst trimethoxy terminated polydimethylsiloxane 30kg,100 cst methyl silicone oil 10kg, fumed silica was carbopol LM150 kg, nano calcium carbonate was particle size 100nm Bai Cuihua CC801 6kg, carbon black was carbopol moll 0.4kg, methyltrimethoxysilane 4.5kg, gamma-aminopropyl triethoxysilane 1.3kg, and dibutyl tin dilaurate 0.2kg.
The preparation method comprises the following steps:
step 1: placing the fumed silica and the nano calcium carbonate in an oven at 120 ℃ for drying for 2 hours; 20000cst trimethoxy end-capped polydimethylsiloxane, 2000cst trimethoxy end-capped polydimethylsiloxane, 100cs methyl silicone oil, carbon black and nano calcium carbonate are added into a reaction kettle of a planetary mixer, and are stirred for 8min at revolution speed of 8rpm and dispersion speed of 12 Hz;
step 2: adding the fumed silica into the reaction kettle for 3 times, stirring for 8min at revolution speed of 2rpm and dispersion speed of 10Hz after each addition, and adding the fumed silica again;
step 3: after all the fumed silica is added and stirred into colloid, the reaction kettle is vacuumized to-0.09 MPa, and stirred for 40min at revolution speed of 10rpm and dispersion speed of 20Hz, wherein circulating water is used in the process, and the material temperature is controlled to be 52 ℃;
step 4: adding methyltrimethoxysilane into a reaction kettle, and stirring for 18min at a revolution speed of 8rpm and a dispersion speed of 28 Hz; adding gamma-aminopropyl triethoxysilane into a reaction kettle, and stirring at revolution speed of 14rpm and dispersion speed of 30Hz for 10min; adding dibutyl tin dilaurate into a reaction kettle, stirring for 6min at revolution speed of 15rpm and dispersion speed of 30Hz, vacuum degree is controlled to-0.09 MPa, and material temperature is controlled to be 52 ℃;
step 5: the dispersion was stopped, and the mixture was stirred at a slow speed of revolution at 2rpm for 10 minutes to discharge bubbles in the gel. And when the temperature of the material is reduced to 35 ℃, discharging, rapidly sealing and packaging to obtain the insulating coating material.
Example 3
An insulating coating material for high-voltage transmission lines comprises the following components: 20000cst trimethoxy terminated polydimethylsiloxane 40kg, 2000cst trimethoxy terminated polydimethylsiloxane 40kg, 100cst methyl silicone oil 20kg, fumed silica was carbopol LM150 kg, nano calcium carbonate was 100nm Bai Cuihua CC801 kg particle size, carbon black was carbopol moll 0.35kg, methyltrimethoxysilane 4kg, N- (beta-aminoethyl) -gamma-aminopropyl methyldimethoxysilane 1.2kg, and dibutyltin diacetate 0.3kg.
The preparation method comprises the following steps:
step 1: placing the fumed silica and the nano calcium carbonate in an oven at 110 ℃ for drying for 3 hours; 20000cst trimethoxy end-capped polydimethylsiloxane, 2000cst trimethoxy end-capped polydimethylsiloxane, 100cst methyl silicone oil, carbon black and nano calcium carbonate are added into a reaction kettle of a planetary mixer, and are stirred for 10min at revolution speed of 10rpm and dispersion speed of 15 Hz;
step 2: adding the fumed silica into the reaction kettle for 3 times, stirring for 10min at revolution speed of 4rpm and dispersion speed of 8Hz after each addition, and adding for the next time;
step 3: after all the fumed silica is added and stirred into colloid, the reaction kettle is vacuumized to-0.09 MPa, and stirred for 36min at revolution speed of 6rpm and dispersion speed of 28Hz, wherein circulating water is used in the process, and the material temperature is controlled to be 48 ℃;
step 4: adding methyltriethoxysilane into the reaction kettle, and stirring for 20min at a revolution speed of 10rpm and a dispersion speed of 25 Hz; adding gamma-aminopropyl trimethoxysilane into a reaction kettle, and stirring for 10min at a revolution speed of 12rpm and a dispersion speed of 30 Hz; adding dibutyltin diacetate into a reaction kettle, stirring for 8min at revolution speed of 14rpm and dispersion speed of 30Hz, vacuum degree in the process being-0.085 MPa, and controlling material temperature to 48 ℃;
step 5: the dispersion was stopped, stirred at a revolution speed of 2rpm for 5 minutes, and the bubbles in the colloid were discharged. And when the temperature of the material is reduced to 39 ℃, discharging, rapidly sealing and packaging to obtain the insulating coating material.
Comparative example 1
An insulating coating material for high voltage transmission lines is different from example 1 in that 2000cst trimethoxy terminated polydimethylsiloxane of low viscosity is not added, and the missing portion is filled with 20000cst trimethoxy terminated polydimethylsiloxane.
Comparative example 2
An insulating coating material for high voltage transmission lines is different from example 2 in that 2000cst trimethoxy terminated polydimethylsiloxane is added without adding 20000cst trimethoxy terminated polydimethylsiloxane, and the missing portion is filled up with high viscosity 20000cst trimethoxy terminated polydimethylsiloxane.
Comparative example 3
An insulating coating material for high voltage transmission lines is different from example 3 in that 30kg of 1000cs trimethoxy-terminated polydimethylsiloxane and 60kg of 10000cs trimethoxy-terminated polydimethylsiloxane are selected.
Comparative example 4
An insulating coating material for high-voltage power transmission lines is different from example 3 in that fumed silica is not added.
Comparative example 5
An insulating coating material for high-voltage power transmission lines is different from example 2 in that 2000cs of terminal hydroxyl polydimethylsiloxane 30kg and 20000cs of terminal hydroxyl polydimethylsiloxane 60kg are selected.
Comparative example 6
An insulating coating material for high-voltage power transmission lines is different from example 1 in that,
the reaction conditions in the step 2 are revolution speed of 15rpm and dispersion speed of 30 Hz;
the reaction conditions in the step 3 are revolution speed of 15rpm and dispersion speed of 35 Hz;
the reaction condition of the crosslinking agent in the step 4 is revolution speed of 15rpm and dispersion speed of 45 Hz; the reaction condition of the coupling agent is revolution speed of 25rpm and dispersion speed of 45 Hz; the reaction conditions of the catalyst were revolution speed of 20rpm and dispersion speed of 45 Hz.
Comparative example 7
An insulating coating material for high-voltage power transmission lines is different from example 1 in that,
the reaction time of the step 2 is 15min;
the reaction time of the step 3 is 120min;
the reaction time of the cross-linking agent in the step 4 is 30min; the reaction time of the coupling agent is 20min; the reaction time of the catalyst was 15min.
The insulating coating materials obtained in examples 1 to 3 of the present invention and comparative examples 1 to 7 were subjected to performance test, and the test results are as follows.
TABLE 1 insulating coating material Performance test results for examples 1-3 and comparative examples 1-7
Table 1 is supplemented with the results of the performance test of the insulating coating materials of examples 1 to 3 and comparative examples 1 to 7
As can be seen from Table 1, examples 1-3 differ from comparative examples 1-2 mainly in the proportions of the components. The example 1 and the comparative example 1 have larger differences in extrudability and consistency index, the lower the consistency of the comparative example 1 (the larger the value is, the thinner the value is), the smaller the extrusion, the stronger the fluidity, the more the extrusion requires the pushing force, which is also reflected in the measured pushing pressure value of the machine; example 2 has lower mechanical properties, in particular poor elasticity, than comparative example 2.
Example 3 differs from comparative example 3 mainly in the fact that the trimethoxy-terminated polydimethylsiloxane selected has a different viscosity and the overall mechanical properties of comparative example 3 are lower.
Example 3 is different from comparative example 4 in that whether fumed silica was added or not, comparative example 4 did not add fumed silica, the sample was not thixotropic, completely fluid, and the mechanical properties were very poor.
Example 2 differs from comparative example 5 in the type of base gum used, and comparative example 5 uses a hydroxyl-terminated polydimethylsiloxane, which is less stable and has very short shelf life.
The main difference between examples 1-3 and comparative examples 6-7 is the process of the preparation method. Comparative example 6 was stirred at a faster rate than example 1, and the fumed silica was dispersed and reacted with the base gum to a higher degree, and the final physical state was a drooling slime, which was not suitable for power line coating. The comparative example 7 was stirred for a longer period of time, the fumed silica was dispersed and reacted with the base gum to a higher degree, and the final physical state was also a drooling slime, which was not suitable for power line coating. Therefore, the stirring speed, stirring time, material temperature and the like in the preparation method can influence the final state and performance of the insulating coating material.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. An insulating coating material for high-voltage transmission lines, which is characterized by comprising the following components: trimethoxy end-capped polydimethylsiloxane, methyl silicone oil, fumed silica, nano calcium carbonate, carbon black, a cross-linking agent, a coupling agent and a catalyst;
the trimethoxy-terminated polydimethylsiloxane comprises trimethoxy-terminated polydimethylsiloxane with viscosity of 2000cst and trimethoxy-terminated polydimethylsiloxane with viscosity of 20000 cst;
the fumed silica is hydrophilic fumed silica.
2. The insulating coating material for high-voltage transmission lines according to claim 1, comprising the following components in parts by weight: 20000cst trimethoxy end-capped polydimethylsiloxane 40-60 parts, 2000cst trimethoxy end-capped polydimethylsiloxane 30-50 parts, methyl silicone oil 10-20 parts, fumed silica 8-12 parts, nano calcium carbonate 3-6 parts, carbon black 0.2-0.5 parts, cross-linking agent 3-5 parts, coupling agent 0.5-1.5 parts and catalyst 0.1-0.25 parts.
3. The insulating coating material for high-voltage power transmission lines according to claim 1, wherein the viscosity of the methyl silicone oil is 100cst.
4. The insulating coating material for high-voltage power transmission lines according to claim 1, wherein the crosslinking agent is one or more of methyltrimethoxysilane or methyltriethoxysilane.
5. The insulating coating material for high-voltage transmission lines according to claim 1, wherein the coupling agent is one or more of γ -aminopropyl triethoxysilane, γ -aminopropyl trimethoxysilane, N- (β -aminoethyl) - γ -aminopropyl trimethoxysilane, and N- (β -aminoethyl) - γ -aminopropyl methyldimethoxysilane.
6. The insulating coating material for high-voltage power transmission lines according to claim 1, wherein the catalyst is one or more of dibutyl tin dilaurate, stannous octoate, and dibutyl tin diacetate.
7. A method for preparing an insulating coating material for high voltage transmission lines according to any one of claims 1 to 6, characterized by comprising the steps of:
step 1, placing fumed silica and nano calcium carbonate in an oven for drying for 2-4 hours; then evenly mixing 20000cst trimethoxy end-capped polydimethylsiloxane, 2000cst trimethoxy end-capped polydimethylsiloxane, 100cst methyl silicone oil, carbon black and nano calcium carbonate, dispersing and stirring;
step 2, adding the fumed silica into the reaction in the step 1 for 3 times, dispersing and stirring after each addition, and then carrying out the next addition;
step 3, vacuumizing, dispersing and stirring, wherein circulating water is used in the process, and the temperature of the materials in the cylinder is controlled to be less than or equal to 55 ℃;
step 4, adding the cross-linking agent, the coupling agent and the catalyst in sequence, dispersing and stirring after each addition, and then carrying out the next addition;
and 5, stopping dispersing, discharging bubbles in the colloid, discharging and rapidly sealing and packaging when the temperature of the material is reduced to below 40 ℃ to obtain the insulating coating material.
8. The method for preparing an insulating coating material for high voltage transmission lines according to claim 7, wherein the dispersion rate in step 2 is revolution speed of 2 to 5rpm, dispersion speed of 5 to 10Hz, and reaction time is 5 to 10min.
9. The method for producing an insulating coating material for high-voltage power transmission lines according to claim 7, wherein the reaction conditions in step 3 are a revolution speed of 6 to 10rpm, a dispersion speed of 20 to 25Hz, a vacuum degree of-0.08 MPa or less, and a reaction time of 30 to 40 minutes.
10. The method for preparing an insulating coating material for high voltage transmission lines according to claim 7, wherein the reaction condition of the crosslinking agent in step 4 is revolution speed of 8 to 10rpm, dispersion speed of 25 to 30Hz, and reaction time is 15 to 20min; the reaction condition of the coupling agent is revolution speed of 10-15 rpm, dispersion speed of 25-30 Hz, and reaction time is 10-15min; the reaction condition of the catalyst is revolution speed of 10-15 rpm, dispersion speed of 25-30 Hz, and reaction time is 6-10min.
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| CN111057465A (en) * | 2019-12-25 | 2020-04-24 | 湖南航天三丰科工有限公司 | Room-temperature-cured insulating coating material and preparation method thereof |
| CN111073591A (en) * | 2019-12-13 | 2020-04-28 | 深圳市丰盛源科技有限公司 | Single-component room temperature curing liquid silicone rubber and preparation method thereof |
| CN113278361A (en) * | 2021-05-14 | 2021-08-20 | 武汉露能科技有限公司 | High-voltage-resistance long-acting stable insulating paint applied to high-voltage power transmission line and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111073591A (en) * | 2019-12-13 | 2020-04-28 | 深圳市丰盛源科技有限公司 | Single-component room temperature curing liquid silicone rubber and preparation method thereof |
| CN111057465A (en) * | 2019-12-25 | 2020-04-24 | 湖南航天三丰科工有限公司 | Room-temperature-cured insulating coating material and preparation method thereof |
| CN113278361A (en) * | 2021-05-14 | 2021-08-20 | 武汉露能科技有限公司 | High-voltage-resistance long-acting stable insulating paint applied to high-voltage power transmission line and preparation method thereof |
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