CN105063784A - Preparation method of low-resistance anti-corona material for vacuum pressure impregnation insulation system - Google Patents
Preparation method of low-resistance anti-corona material for vacuum pressure impregnation insulation system Download PDFInfo
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Abstract
The invention relates to a preparation method of a low-resistance anti-corona material for a vacuum pressure impregnation insulation system. The preparation method comprises the steps that crylic acid or an acrylic acid copolymer is added in the polymerization stage of preparing polyacrylonitrile and carbon nanotube composite fibers; by utilizing wet spinning, precursor fibers and glass fibers are twisted into threads, the threads are woven into cloth, and the cloth is rolled and sheared to serve as the low-resistance anti-corona material. The low-resistance anti-corona material is half-lapped outside an insufficient-glue main insulation layer of a stator coil bar, the surface of the overall stator coil bar is coated with a layer of demoulding strips with holes, the stator coil bar is placed into a vacuum pressure paint impregnation tank, after being impregnated with paint, the stator coil bar is bound with a high-resistance anti-corona layer in a half-lapping mode and contained in a mould, the mould is placed in an oven, and hot-press solidification forming is performed; after the main insulation layer is formed through solidification, sharp corners on the arris surfaces of the coil bar are removed, a layer of anti-resistance anti-corona paint can be painted outside a protection layer, and then the finished product, VPI stator coil bar, is obtained. According to the preparation method, the problem that the impregnation paint is polluted due to the fact that conduction materials in an anti-corona layer fall off when vacuum paint impregnation is performed on the low-resistance anti-corona layer of the stator coil bar in the insufficient-glue insulation system is solved.
Description
Technical field:
The present invention relates to a kind of preparation method of vacuum pressure varnished insulation system low-resistance corona-prevention material.
Background technology:
Along with introduction and the absorption of the few glue insulation system of large generator stator bar vacuum pressure impregnation, the quality utilizing vacuum pressure impregnation technology to prepare line rod is become better and better, the capacity motor of preparation is increasing, but domestic vacuum pressure impregnation of also cannot producing prepares material required for line rod at present, wherein anti dizzy structure is one of key technology preparing stator bar, low-resistance corona-prevention material domestic at present, add conductive compositions in adhesive, be immersed on glass fabric or asbestos yarn after mixing, be prefabricated into the low-resistance corona-prevention belt of semi-cured state, this low-resistance material is applicable to rich mica tape molded isolation system, when this low-resistance material is used in vacuum pressure varnished insulation system, semi-conducting material in low-resistance belt often can split away off in vacuum paint dipping process, not only polluting impregnating varnish causes impregnating varnish not use, the also uniformity of the surface resistivity in effect string rod groove portion, reduce the line anti-corona level of rod and service life.
Summary of the invention:
When the object of the invention is to provide a kind of vacuum paint dipping, semi-conducting material does not come off, does not pollute the preparation method of vacuum pressure varnished insulation system low-resistance corona-prevention material of impregnating varnish.Technical scheme of the present invention is: the preparation method of vacuum pressure varnished insulation system low-resistance corona-prevention material, 1) CNT after purifying, after surface treatment, by ultrasonic disperse in the aqueous solution of sodium sulfocyanate mass percentage content 50%, obtain carbon nano tube suspension; Polyacrylonitrile powder joins in the aqueous solution of sodium sulfocyanate mass percentage content about 50%, temperature to control at 0 ~ 15 DEG C swelling 3 ~ 5 hours, heating water solution to 60 ~ 80 DEG C, continue to stir the aqueous solution 6 ~ 8 hours, aqueous cooling solution obtains polyacrylonitrile solution; Carbon nano tube suspension obtained above and polyacrylonitrile solution are mixed, room temperature mechanical is uniformly mixed liquid 3 ~ 5 hours, and mixed liquor after filtration, after deaeration, obtain polyacrylonitrile and CNT mixed solution; Wherein, CNT vs polypropylene nitrile mass percent is 0.1% ~ 15%;
2), when preparing polyacrylonitrile and carbon nano tube composite fibre, need add a kind of comonomer material at spinning solution polymerization stage, addition is 6% ~ 10% of acrylonitrile monemer quality;
3) wet spinning is utilized, spinning solution is polyacrylonitrile mass percentage content 12% ~ 14%, CNT vs polypropylene nitrile mass percent is 0.1% ~ 15%, the aqueous solution of sodium sulfocyanate mass percentage content about 50%, the pH ≈ 5 of sodium thiocyanate water solution, spinning solution enters coagulating bath through spinning head again, coagulating bath is the sodium thiocyanate water solution of mass percentage content 9% ~ 14%, bath temperature 8 ~ 12 DEG C, spinning speed 5 ~ 10m/min, the tow of coagulating bath is introduced pre-heating bath and is heat-treated, pre-heating bath is the sodium thiocyanate water solution of mass percentage content 2% ~ 8%, bath temperature is 60 ~ 65 DEG C, fiber is stretched to 1.5 times in pre-heating bath, tow after pre-heating bath process is introduced in rinsing bowl and is washed, hot water temperature in rinsing bowl is 50 ~ 65 DEG C, after washing, tow stretches in stretching bath, the water temperature of stretch bath is 95 ~ 98 DEG C, draw ratio is 5.0 ~ 6.8 times, the total draw ratio of twice stretching requires to be 8 ~ 10 times, tow oils through finish application bath subsequently, tow carries out compacting by drying in drying machine, then tow is through crimping machine, enter decatize pot again and carry out HEAT SETTING, steam pressure is 2.5 × 10
2kPa, shaping time about 10min, then tow oils, then drying carries out compacting by drying, and finally by cut-out packing, wet spinning single hole aperture is 0.01 ~ 0.08mm, reactor material should adopt stainless steel,
5) polyacrylonitrile and carbon nano tube composite fibre are twisted thread with glass yarn again, are then woven into cloth, and after removing slurry and dewaxing treatment, obtain low resistance semiconductor cloth, the thickness of low resistance semiconductor cloth is 0.05 ~ 0.20mm, and surface resistivity is 5 × 10
2~ 5 × 10
4ohm;
6) width of the low-resistance corona-prevention belt of line rod use is 20 ~ 30mm, and half-lap, forms low-resistance corona-prevention layer (3) at the few glue main insulating layer (2) of stator bar outward;
7) at whole stator bar (1) surperficial bag one deck demoulding band with holes;
8) stator bar (1) is put into vacuum pressure impregnation (VPI, vacuumpressureimpregnation) tank, carry out vacuum pressure impregnation;
9) after dipping lacquer, stator bar (1) removes demoulding band with holes, half-lap wraps up the first high resistant anti-halo layer (4), the second high resistant anti-halo layer (5), third high resistance anti-halo layer (6) again, each section of anti-halo layer overlap joint 20mm, the first high resistant anti-halo layer (4), the second high resistant anti-halo layer (5), third high resistance anti-halo layer (6) outward again half-lap wrap up two-layer overcoat (7);
10) demoulding band that stator bar wrapping is not with holes, puts into mould, has added die pressure, mould is placed on hot-press solidifying in baker shaping;
11) unload mold after mold cools down, remove the demoulding band of coil, namely make high-voltage motor anti-halo layer and the shaping vacuum pressure impregnation stator bar of major insulation single-steeping.
CNT has excellent electric conductivity, is incorporated into by carbon nano-tube material in cyclization, can produce the fine and carbon nano tube composite fibre of the polypropylene with semiconducting behavior.Polyacrylonitrile fibre due to wet spinning manufacture is surperficial and internal flaw is more, has obvious skin-core structure to have impact on the intensity of fiber, is introduced by CNT in polyacrylonitrile fibre, can also increase the mechanical property of composite fibre.Polypropylene fine with carbon nano tube composite fibre again with fiberglass braided become cloth, become the semiconductor composite of carbon nanotubes, wherein glass fibre plays the effect strengthening mechanical performance.By adjustment manufacturing technique, the satisfactory semiconductor composite of surface resistivity can be produced.This semiconductor composite is as the novel low-resistance corona-prevention material of the few glue insulation system of vacuum pressure impregnation, vacuum pressure impregnation can be carried out together with the major insulation material of stator bar, novel low-resistance corona-prevention material comes off without semi-conducting material, do not pollute impregnating varnish, can low-resistance corona-prevention material outside subrogate country.
The low-resistance corona-prevention belt held in order to avoid line rod during vacuum pressure impregnation pollutes impregnating varnish, the present invention uses polyacrylonitrile and carbon nano tube composite fibre to prepare low-resistance corona-prevention material, the content of adjustment CNT in composite fibre, the semiconductor fiber of different resistivity can be obtained, polyacrylonitrile and carbon nano tube composite fibre and braided fabric thereof are except having certain semiconductive performance, also there is good tensile strength, flexibility and heat endurance, the present invention prepares experience and technology in conjunction with Ha electricity company stator bar Anti-Corona Material for many years, exploitation is applicable to the low-resistance corona-prevention material of VPI insulation system, for high voltage, the generator insulating structural design of high power capacity and high strength and production provide reliable technical guarantee.
High pressure VPI stator bar major insulation and low-resistance corona-prevention layer dipping lacquer, the porosity of corona-prevention belt is between 0.5% ~ 10%, and Anti-Corona Material is insoluble to impregnating varnish, and during dipping, Anti-Corona Material does not come off, and does not pollute impregnating varnish, and the resistance of Anti-Corona Material is stablized.
The domestic preparation that the present invention has filled up vacuum pressure varnished insulation system low-resistance corona-prevention material is blank, and every anti-corona technique index reaches Foreign Advanced Lerel: 1) the surface resistivity scope that has of Anti-Corona Material is 5 × 10
-2to 5 × 10
4between ohm; 2) the single stator bar discharge inception voltage adopting Anti-Corona Material of the present invention to prepare all is greater than 2U
n, wherein U
nit is rated voltage; 3) stator bar flashover breakdown voltage is greater than 2U
n; 4) stator bar 2U
nthe voltage ageing life-span is all greater than 1000 hours.
This Anti-Corona Material is applicable to few glue vacuum pressure impregnation technique, the present invention extends on the stator bar anti dizzy structure of large high-voltage motor, be with a wide range of applications, for the stator bar of water power 1,000,000, thermoelectricity 1,000,000, nuclear power 1,000,000 unit and stator winding have established reliable anti-corona technique basis.
The present invention uses polyacrylonitrile and carbon nano tube composite fibre to be prepared into the low-resistance corona-prevention belt with semiconducting behavior, because anti-corona performance is the performance that material body has, do not need extra bonding semi-conducting material, in major insulation vacuum impregnation process, Anti-Corona Material stable performance, do not pollute impregnating varnish, and resistance is stablized; Can low-resistance corona-prevention material outside subrogate country, reduce the stator bar manufacturing cost of VPI insulation system, strengthening the competitiveness of Chinese generating equipment enterprise and overseas enterprise, laying the foundation for opening up overseas market.
Accompanying drawing illustrates:
The low-resistance corona-prevention belt application schematic diagram that Fig. 1 the present invention dipping lacquer is shaping.
Detailed description of the invention:
The present invention is a kind of high voltage large-sized electricity generator VPI stator bar low-resistance corona-prevention Anti-Corona Material, and preparation is as follows with the detailed description of the invention of use low-resistance corona-prevention material.
Embodiment 1:
1) CNT after purifying, after surface treatment, by ultrasonic disperse in the aqueous solution of sodium sulfocyanate mass percentage content 50%, obtains carbon nano tube suspension; Polyacrylonitrile powder joins in the aqueous solution of sodium sulfocyanate mass percentage content about 50%, temperature to control at 0 ~ 15 DEG C swelling 3 ~ 5 hours, heating water solution to 60 ~ 80 DEG C, continue to stir the aqueous solution 6 ~ 8 hours, aqueous cooling solution obtains polyacrylonitrile solution; Carbon nano tube suspension obtained above and polyacrylonitrile solution are mixed, room temperature mechanical is uniformly mixed liquid 3 ~ 5 hours, and mixed liquor after filtration, after deaeration, obtain polyacrylonitrile and CNT mixed solution; Wherein, CNT vs polypropylene nitrile mass percent is 0.1% ~ 15%;
2) when preparing polyacrylonitrile and carbon nano tube composite fibre, a kind of comonomer material need be added at spinning solution polymerization stage, as fine in acrylic acid, methacrylic acid, itaconic acid, methyl acrylate, acrylamide, amino-ethyl-2-methacrylate, vinylacetate, 2-metering system, methyl methacrylate, N hydroxymethyl acrylamide etc., the addition of comonomer is 6% ~ 10% of acrylonitrile monemer quality;
4) spinning solution component: the first monomer is acrylonitrile, its mass percentage content 90 ~ 94%, second comonomer is comonomer material, its mass percentage content 6 ~ 10%, azodiisobutyronitrile is initator, its amount of inserting is 0.2 ~ 0.8% of the first monomer and second comonomer gross mass, isopropyl alcohol is as molecular weight regulator, its amount of inserting is 0.1 ~ 0.5% of the first monomer and second comonomer gross mass, 50% sodium thiocyanate solution is as solvent, reaction temperature at 76 ~ 82 DEG C, reaction time 20-30 hour;
5) wet spinning is utilized, spinning solution is polyacrylonitrile mass percentage content 12% ~ 14%, CNT vs polypropylene nitrile mass percent is 0.1% ~ 15%, the aqueous solution of sodium sulfocyanate mass percentage content about 50%, the pH ≈ 5 of sodium thiocyanate water solution, spinning solution enters coagulating bath through spinning head again, coagulating bath is the sodium thiocyanate water solution of mass percentage content 9% ~ 14%, bath temperature 8 ~ 12 DEG C, spinning speed 5 ~ 10m/min, the tow of coagulating bath is introduced pre-heating bath and is heat-treated, pre-heating bath is the sodium thiocyanate water solution of mass percentage content 2% ~ 8%, bath temperature is 60 ~ 65 DEG C, fiber is stretched to 1.5 times in pre-heating bath, tow after pre-heating bath process is introduced in rinsing bowl and is washed, hot water temperature in rinsing bowl is 50 ~ 65 DEG C, after washing, tow stretches in stretching bath, the water temperature of stretch bath is 95 ~ 98 DEG C, draw ratio is 5.0 ~ 6.8 times, the total draw ratio of twice stretching requires to be 8 ~ 10 times, tow oils through finish application bath subsequently, tow carries out compacting by drying in drying machine, then tow is through crimping machine, enter decatize pot again and carry out HEAT SETTING, steam pressure is 2.5 × 10
2kPa, shaping time about 10min, then tow oils, then drying carries out compacting by drying, and finally by cut-out packing, wet spinning single hole aperture is 0.01 ~ 0.08mm, reactor material should adopt stainless steel,
6) polyacrylonitrile and carbon nano tube composite fibre are twisted thread with glass yarn again, are then woven into cloth, and after removing slurry and dewaxing treatment, obtain low resistance semiconductor cloth, the thickness of low resistance semiconductor cloth is 0.05 ~ 0.20mm, and surface resistivity is 5 × 10
2~ 5 × 10
4ohm;
7) as shown in Figure 1: the width of the low-resistance corona-prevention belt that line rod uses is 20 ~ 30mm, half-lap, outside the few glue main insulating layer 2 of stator bar, forms low-resistance corona-prevention layer 3;
8) at whole stator bar 1 surperficial bag one deck demoulding band with holes;
9) stator bar 1 is put into vacuum pressure impregnation tank, carry out vacuum pressure impregnation;
10) after dipping lacquer, stator bar 1 removes demoulding band with holes, half-lap wraps up the first high resistant anti-halo layer 4, second high resistant anti-halo layer 5, third high resistance anti-halo layer 6 again, each section of anti-halo layer overlap joint 20mm, wraps up two-layer overcoat 7 at the first high resistant anti-halo layer 4, second high resistant anti-halo layer 5, the outer half-lap again of third high resistance anti-halo layer 6;
11) demoulding band that stator bar (1) wrapping is not with holes, puts into mould, has added die pressure, mould is placed on hot-press solidifying in baker shaping;
12) unload mold after mold cools down, remove the demoulding band of coil, at overcoat 7 outer brush one deck high resistant anticorona varnish 8, namely make high-voltage motor anti-halo layer and the shaping vacuum pressure impregnation stator bar of major insulation single-steeping.
External diameter 10 ~ the 20nm of CNT, length is 5 ~ 15 μm, and purity is mass percent 95 ~ 98%.
In step 2, spinning solution polymerization stage adds a kind of comonomer material is one of llowing group of materials: acrylic acid, methacrylic acid, itaconic acid, methyl acrylate, acrylamide, amino-ethyl-2-methacrylate, vinylacetate, 2-metering system are fine, methyl methacrylate, N hydroxymethyl acrylamide.
In a step 11, at stator bar overcoat (7) outer brush one deck high resistant anticorona varnish (8).
Embodiment 2:
Other step is with embodiment 1, difference is in step 12: unload mold after mold cools down, remove the demoulding band of coil, at the outer not brush high resistant anticorona varnish 8 of overcoat 7, namely make high-voltage motor anti-halo layer and the shaping vacuum pressure impregnation stator bar of major insulation single-steeping.
Polyacrylonitrile spining technology is very ripe, CNT widely uses at present, some scholars is had to have studied the method for production of polyacrylonitrile-carbon nano tube composite fibre, but the concrete wet spinning process introducing manufacture polyacrylonitrile-carbon nano tube composite fibre, is not applied in high-rating generator anti dizzy structure yet.The single stator bar discharge inception voltage that above-mentioned embodiment of the present invention makes all is greater than 2U
n, wherein U
nit is the rated voltage of motor; Stator bar 2U
nthe voltage ageing life-span is all greater than 1000 hours.
The present invention is applicable to anti dizzy structure and preparation method in the dry mica tape VPI isolation system of generator or motor stator line rod.
Claims (4)
1. a preparation method for vacuum pressure varnished insulation system low-resistance corona-prevention material, is characterized in that:
1) CNT after purifying, after surface treatment, by ultrasonic disperse in the aqueous solution of sodium sulfocyanate mass percentage content 50%, obtains carbon nano tube suspension; Polyacrylonitrile powder joins in the aqueous solution of sodium sulfocyanate mass percentage content about 50%, temperature to control at 0 ~ 15 DEG C swelling 3 ~ 5 hours, heating water solution to 60 ~ 80 DEG C, continue to stir the aqueous solution 6 ~ 8 hours, aqueous cooling solution obtains polyacrylonitrile solution; Carbon nano tube suspension obtained above and polyacrylonitrile solution are mixed, room temperature mechanical is uniformly mixed liquid 3 ~ 5 hours, and mixed liquor after filtration, after deaeration, obtain polyacrylonitrile and CNT mixed solution; Wherein, CNT vs polypropylene nitrile mass percent is 0.1% ~ 15%;
2), when preparing polyacrylonitrile and carbon nano tube composite fibre, need add a kind of comonomer material at spinning solution polymerization stage, addition is 6% ~ 10% of acrylonitrile monemer quality;
3) wet spinning is utilized, spinning solution is polyacrylonitrile mass percentage content 12% ~ 14%, CNT vs polypropylene nitrile mass percent is 0.1% ~ 15%, the aqueous solution of sodium sulfocyanate mass percentage content about 50%, the pH ≈ 5 of sodium thiocyanate water solution, spinning solution enters coagulating bath through spinning head again, coagulating bath is the sodium thiocyanate water solution of mass percentage content 9% ~ 14%, bath temperature 8 ~ 12 DEG C, spinning speed 5 ~ 10m/min, the tow of coagulating bath is introduced pre-heating bath and is heat-treated, pre-heating bath is the sodium thiocyanate water solution of mass percentage content 2% ~ 8%, bath temperature is 60 ~ 65 DEG C, fiber is stretched to 1.5 times in pre-heating bath, tow after pre-heating bath process is introduced in rinsing bowl and is washed, hot water temperature in rinsing bowl is 50 ~ 65 DEG C, after washing, tow stretches in stretching bath, the water temperature of stretch bath is 95 ~ 98 DEG C, draw ratio is 5.0 ~ 6.8 times, the total draw ratio of twice stretching requires to be 8 ~ 10 times, tow oils through finish application bath subsequently, tow carries out compacting by drying in drying machine, then tow is through crimping machine, enter decatize pot again and carry out HEAT SETTING, steam pressure is 2.5 × 10
2kPa, shaping time about 10min, then tow oils, then drying carries out compacting by drying, and finally by cut-out packing, wet spinning single hole aperture is 0.01 ~ 0.08mm, reactor material should adopt stainless steel,
5) polyacrylonitrile and carbon nano tube composite fibre are twisted thread with glass yarn again, are then woven into cloth, and after removing slurry and dewaxing treatment, obtain low resistance semiconductor cloth, the thickness of low resistance semiconductor cloth is 0.05 ~ 0.20mm, and surface resistivity is 5 × 10
2~ 5 × 10
4ohm;
6) width of the low-resistance corona-prevention belt of line rod use is 20 ~ 30mm, and half-lap, forms low-resistance corona-prevention layer (3) at the few glue main insulating layer (2) of stator bar outward;
7) at whole stator bar (1) surperficial bag one deck demoulding band with holes;
8) stator bar (1) is put into vacuum pressure impregnation VPI, in vacuumpressureimpregnation tank, carry out vacuum pressure impregnation;
9) after dipping lacquer, stator bar (1) removes demoulding band with holes, half-lap wraps up the first high resistant anti-halo layer (4), the second high resistant anti-halo layer (5), third high resistance anti-halo layer (6) again, each section of anti-halo layer overlap joint 20mm, the first high resistant anti-halo layer (4), the second high resistant anti-halo layer (5), third high resistance anti-halo layer (6) outward again half-lap wrap up two-layer overcoat (7);
10) demoulding band that stator bar wrapping is not with holes, puts into mould, has added die pressure, mould is placed on hot-press solidifying in baker shaping;
11) unload mold after mold cools down, remove the demoulding band of coil, namely make high-voltage motor anti-halo layer and the shaping vacuum pressure impregnation stator bar of major insulation single-steeping.
2. the preparation method of a kind of vacuum pressure varnished insulation system low-resistance corona-prevention material according to claim 1, is characterized in that: in step 2, spinning solution polymerization stage adds a kind of comonomer material is one of llowing group of materials: acrylic acid, methacrylic acid, itaconic acid, methyl acrylate, acrylamide, amino-ethyl-2-methacrylate, vinylacetate, 2-metering system are fine, methyl methacrylate, N hydroxymethyl acrylamide.
3. the preparation method of a kind of vacuum pressure varnished insulation system low-resistance corona-prevention material according to claim 1, it is characterized in that: the external diameter 10 ~ 20nm of CNT, length is 5 ~ 15 μm, and purity is mass percent 95 ~ 98%.
4. the preparation method of a kind of vacuum pressure varnished insulation system low-resistance corona-prevention material according to claim 1, is characterized in that: in a step 11, at stator bar overcoat (7) outer brush one deck high resistant anticorona varnish (8).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111088536A (en) * | 2018-10-23 | 2020-05-01 | 中国石油化工股份有限公司 | Oiling method of polyacrylonitrile protofilament |
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