CN116844800A - Preparation method of epoxy resin taper sleeve of oiled paper capacitor sleeve - Google Patents
Preparation method of epoxy resin taper sleeve of oiled paper capacitor sleeve Download PDFInfo
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- CN116844800A CN116844800A CN202311017232.3A CN202311017232A CN116844800A CN 116844800 A CN116844800 A CN 116844800A CN 202311017232 A CN202311017232 A CN 202311017232A CN 116844800 A CN116844800 A CN 116844800A
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- 239000003822 epoxy resin Substances 0.000 title claims abstract description 60
- 229920000647 polyepoxide Polymers 0.000 title claims abstract description 60
- 239000003990 capacitor Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 41
- 239000000945 filler Substances 0.000 claims abstract description 40
- 239000003292 glue Substances 0.000 claims abstract description 25
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- 238000002347 injection Methods 0.000 claims abstract description 19
- 239000007924 injection Substances 0.000 claims abstract description 19
- 239000000084 colloidal system Substances 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 238000007711 solidification Methods 0.000 claims abstract description 6
- 230000008023 solidification Effects 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims description 40
- 238000009849 vacuum degassing Methods 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 25
- 238000007872 degassing Methods 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 13
- 238000004513 sizing Methods 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000011863 silicon-based powder Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000000113 differential scanning calorimetry Methods 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- 238000011417 postcuring Methods 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000012790 confirmation Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 20
- 229910052573 porcelain Inorganic materials 0.000 abstract description 11
- 238000010304 firing Methods 0.000 abstract description 6
- -1 accelerator Substances 0.000 abstract description 2
- 239000000919 ceramic Substances 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 239000000047 product Substances 0.000 description 5
- 239000003921 oil Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 208000028659 discharge Diseases 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000013467 fragmentation Methods 0.000 description 2
- 238000006062 fragmentation reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000004017 vitrification Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/56—Insulating bodies
- H01B17/58—Tubes, sleeves, beads, or bobbins through which the conductor passes
- H01B17/583—Grommets; Bushings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a preparation method of an epoxy resin taper sleeve of an oiled paper capacitor sleeve, which is used for solving the technical problems that the existing porcelain taper sleeve is long in production period and low in yield, the firing of the porcelain taper sleeve cannot ensure concentricity and has a rough surface, and the porcelain taper sleeve is easy to crack, so that the risk of partial discharge of a transformer is increased. The invention relates to a preparation method of an epoxy resin taper sleeve of an oiled paper capacitor sleeve, which comprises the following steps: preparing corresponding curing agent, accelerator, filler and color paste according to the mixture ratio by taking epoxy resin material as base material; preparing a taper sleeve mold, wherein the taper sleeve mold comprises an outer mold and a mold core, a pouring cavity is formed between the outer mold and the mold core, and a glue injection port is formed in the upper part of the taper sleeve mold; injecting the colloid which is treated and stirred into a taper sleeve mold through a glue injection port; and (3) solidifying the colloid according to a solidifying curve, demoulding after solidification and post-solidifying to finish the preparation of the epoxy resin taper sleeve of the oil paper capacitor sleeve.
Description
Technical Field
The invention relates to an oiled paper capacitive sleeve, in particular to a preparation method of an epoxy resin taper sleeve of the oiled paper capacitive sleeve.
Background
At present, the taper sleeve of the insulating part in oil of the oilpaper capacitive bushing used in the power transmission and transformation industry is of a porcelain structure. With the rapid development of the power transmission and transformation industry, the problems faced by the porcelain taper sleeve are gradually prominent, and the porcelain taper sleeve mainly comprises the following aspects:
1. the porcelain taper sleeve needs to be made into blanks by using ceramic mud and then is fired in a kiln, the manufacturing process is complex, and the production period needs 40-50 days; meanwhile, the process controllability after kiln feeding firing is not strong, the firing effect can be determined after kiln discharging, and the deformation rate of blanks after firing is large, so that the yield is not high; and most sleeve factories have no production condition and can only purchase outsourcing and are limited by porcelain suppliers.
2. Because the ceramic taper sleeve is easy to deform in the firing process due to the manufacturing process, concentricity cannot be completely ensured, the overall appearance of the sleeve is affected, and the surface and the end face of the fired ceramic taper sleeve are rough, so that the sleeve is not easy to seal.
3. The ceramic taper sleeve is relatively high in brittleness due to the fact that the ceramic taper sleeve is relatively high in brittleness, is slightly bumped or is extremely easy to burst due to severe thermal expansion and cold contraction, is used as an insulating part in oil and is arranged inside a transformer oil tank, and if fragments of the ceramic taper sleeve fall into the inside of the transformer after being cracked, the partial discharge risk of the transformer is increased, so that serious faults are caused.
Disclosure of Invention
The invention aims to solve the technical problems that the existing porcelain taper sleeve is long in production period, low in yield, incapable of guaranteeing concentricity and rough in surface due to firing, and high in partial discharge risk of a transformer due to easiness in cracking of the porcelain taper sleeve, and provides a preparation method of an epoxy resin taper sleeve of an oilpaper capacitor sleeve.
In order to achieve the above object, the technical solution of the present invention is as follows:
the preparation method of the epoxy resin taper sleeve of the oiled paper capacitor sleeve is characterized by comprising the following steps of:
taking an epoxy resin material as a base material, and preparing a corresponding curing agent, an accelerator, a filler and color paste according to the mass ratio of the mixture; wherein, the mixture mass ratio of the epoxy resin base material, the curing agent, the accelerator, the filler and the color paste is 1:0.5-1.2:0.1-0.3%:2-5:0.03-0.1;
sequentially carrying out drying and degassing and preheating and degassing treatment on the filler prepared in the step 1, and carrying out preheating treatment on the epoxy resin base material prepared in the step 1; simultaneously, after the taper sleeve mold is coated with a release agent, subjected to high-temperature treatment, die-loaded and die-assembled in sequence, the taper sleeve mold is subjected to preheating treatment, the taper sleeve mold adopts a steel gravity casting mold, and comprises an outer mold and a mold core, a casting cavity is formed between the outer mold and the mold core, and a glue injection port is formed in the upper part of the taper sleeve mold and used for injecting glue into the casting cavity;
dividing the filler treated in the step 2 into two parts according to a proportion, adding one part of the filler and the epoxy resin base material treated in the step 2 into a premixing tank A together, stirring and mixing, then carrying out vacuum degassing treatment, adding the other part of the filler and the curing agent prepared in the step 1 into a premixing tank B together, stirring and mixing, then carrying out vacuum degassing treatment, adding the premixed colloid subjected to vacuum degassing treatment in the premixing tank A and the premixing tank B, and adding the accelerator prepared in the step 1 and the color paste into a final mixing tank together, stirring and mixing, and then carrying out vacuum degassing treatment;
or directly adding the epoxy resin base material treated in the step 2, the filler and the curing agent, the accelerator and the color paste prepared in the step 1 into a final mixing tank together, stirring and mixing, and then carrying out vacuum degassing treatment;
after no bubbles are confirmed on a degassing umbrella of the final mixing tank, injecting the sizing material in the final mixing tank into the taper sleeve mold preheated in the step 2 through a glue injection port, and performing pressure maintaining treatment after pouring is finished;
solidifying the colloid in the taper sleeve mold according to the solidifying curve after the pressure maintaining is finished, demolding the colloid after the solidifying is finished, and performing post-solidifying on the demolded colloid;
and 6, cleaning colloid corresponding to the position of the glue injection port, removing burrs and burrs, and performing relevant tests according to requirements to finish the preparation of the epoxy resin taper sleeve of the oiled paper capacitor sleeve.
Further, in the step 1 ], the filler is silicon powder;
the mass ratio of the mixture of the epoxy resin base material, the curing agent, the accelerator, the silicon powder and the color paste is 1:0.9:0.15%:3.2:0.05.
further, in the step 2, the temperature of the drying and degassing treatment of the filler is 150-180 ℃, the vacuum degree is 600-1500Pa, and the treatment time is 6-10 hours; the temperature of the filler preheating and degassing treatment is 80-100 ℃, the vacuum degree is 600-1500Pa, and the treatment time is 4-6h;
the temperature of the preheating treatment of the epoxy resin base material is 50-70 ℃ and the treatment time is 6-10h;
the high-temperature treatment temperature of the taper sleeve mold is 120-130 ℃, and the treatment time is 2-4h; the taper sleeve mold is preheated by an oven, the temperature is 100-120 ℃, and the treatment time is 4-6h.
Further, in the step 3, the temperature of the vacuum degassing treatment in the premixing A tank is 65-70 ℃, the vacuum degree is 100-300Pa, and the treatment time is 4-6 hours; the temperature of vacuum degassing treatment in the premixing tank B is 65-70 ℃, the vacuum degree is 200-400Pa, and the treatment time is 3-5h;
when the pre-mixed colloid subjected to vacuum degassing treatment in the pre-mixed tank A and the pre-mixed tank B is added into a final mixing tank, the temperature of the vacuum degassing treatment in the final mixing tank is 65-70 ℃, the vacuum degree is 50-250Pa, and the treatment time is 0.5-2h;
directly adding the epoxy resin base material treated in the step 2, the filler, the curing agent prepared in the step 1, the accelerator and the color paste into a final mixing tank, wherein the temperature of the final mixing tank for vacuum degassing treatment is 65-70 ℃, the vacuum degree is 20-80Pa, and the treatment time is 4-6h.
Further, in the step 4, the temperature of the pressure maintaining treatment is 65-70 ℃, the vacuum degree is 50-250Pa, and the treatment time is 0.5-2h.
Further, in step 5 ], the solidification curve is obtained by the following method:
and taking a small amount of epoxy resin in the current use batch, and performing DSC analysis after curing according to the mixture ratio to obtain a curing curve.
Further, in the step 5, the curing process is divided into three sections, and the parameters are that the temperature is cured for 2-3 hours at 80-100 ℃, the temperature is cured for 2-3 hours at 100-135 ℃ and the temperature is cured for 12-13 hours at 135 ℃.
Further, in the step 5, the post-curing temperature is 120-130 ℃ and the curing time is 10-14h.
Further, in step 2, during die filling, compressed air is required to be used for blowing out cleanly, and after careful inspection and confirmation of no impurities, die clamping can be performed;
in the step 5, water is supplemented through the glue injection port every 2-3h during solidification.
Compared with the prior art, the invention has the following beneficial effects:
1. compared with the traditional porcelain taper sleeve, the invention completes the preparation of the epoxy resin taper sleeve of the oil paper capacitor sleeve by combining a special taper sleeve die with proper mixture mass ratio and an integral process flow, shortens the production period of the taper sleeve to 3-4 days, greatly shortens the production period, has stronger process controllability in the production process, can be adjusted at any time, has the integral yield of more than 99 percent, can meet the rapid development of the power transmission and transformation industry and the high requirements of users on the product quality and the production period, and has wide application prospect.
2. The epoxy resin taper sleeve prepared by the invention has good toughness, has strong mechanical strength while ensuring insulating property, and can effectively prevent transformer faults caused by fragmentation.
3. The epoxy resin taper sleeve prepared by the invention is formed by vacuum casting and curing through the die, so that the appearance is attractive, the concentricity of the epoxy resin taper sleeve can be ensured, the surface and the end face are smooth and free of burrs, the assembly is convenient, and the sealing effect is good.
4. The filler is silicon powder during preparation, so that the production cost can be greatly reduced, and the strength of the finished product of the epoxy resin taper sleeve can be further increased.
Drawings
FIG. 1 is a schematic flow chart of a method for preparing an epoxy resin taper sleeve of an oiled paper capacitor sleeve.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1
As shown in fig. 1, the preparation method of the epoxy resin taper sleeve of the oiled paper capacitor sleeve specifically comprises the following steps:
1 preparation of raw materials
Epoxy resin material is used as base material, and corresponding curing agent, accelerator, filler and color paste are prepared according to the mass ratio of the mixture. The silica powder is selected as the filler in the embodiment, so that the production cost can be greatly reduced, and the strength of the finished product of the epoxy resin taper sleeve can be further increased; wherein, the mixture mass ratio of the epoxy resin base material, the curing agent, the accelerator, the filler and the color paste is 1:0.5-1.2:0.1-0.3%:2-5:0.03-0.1. In the embodiment, the filler adopts silicon powder, and the mass ratio of the mixture of the epoxy resin base material, the curing agent, the accelerator, the silicon powder and the color paste is 1:0.9:0.15%:3.2:0.05, and other proportions within the above ranges may be used in other embodiments of the invention.
2 preparation of the Process-preheating
Sequentially carrying out drying and degassing and preheating and degassing treatment on the filler prepared in the step 1, wherein the temperature of the drying and degassing treatment of the filler is 150-180 ℃, the vacuum degree is 600-1500Pa, the treatment time is 6-10h, the temperature of the preheating and degassing treatment of the filler is 80-100 ℃, the vacuum degree is 600-1500Pa, and the treatment time is 4-6h; in the embodiment, the temperature of the drying and degassing treatment of the filler is 150 ℃, the vacuum degree is 600Pa, and the treatment time is 9.5 hours; the temperature of the filler preheating and degassing treatment is 80 ℃, the vacuum degree is 600Pa, and the treatment time is 6 hours. In actual production, the equipment is started first, the weight of the filler in the filler drying tank is checked and confirmed, and according to the production requirement, if the quantity is insufficient, the material is fed and dried and degassed one day in advance. The invention takes care of not cutting off the power supply and cutting off the water when vacuum degassing is carried out, and confirms that the cooling circulating water is started so as to prevent the vacuum pump from being damaged.
Meanwhile, the epoxy resin base material prepared in the step 1 is subjected to preheating treatment, wherein the preheating treatment temperature is 50-70 ℃, the treatment time is 6-10h, and the epoxy resin base material preheating treatment temperature in the embodiment is 60 ℃ and the treatment time is 8h.
Preparing a taper sleeve mold, sequentially coating a release agent on the taper sleeve mold, carrying out high-temperature treatment and mold loading, and then carrying out preheating treatment on the taper sleeve mold; wherein the high-temperature treatment temperature of the taper sleeve mold is 120-130 ℃ and the treatment time is 2-4h; the taper sleeve mold is preheated by an oven, the temperature is 100-120 ℃, and the treatment time is 4-6h; in the embodiment, the high-temperature treatment temperature of the taper sleeve mold is 120 ℃, the treatment time is 3 hours, the preheating treatment temperature of the taper sleeve mold is 100 ℃, and the treatment time is 5 hours. Specifically, the taper sleeve mold adopts a steel gravity pouring mold, and comprises an outer mold and a mold core, wherein the middle of the outer mold and the mold core is hollow after the outer mold and the mold core are assembled (mold-filling), the hollow part is a pouring cavity, and an open type glue injection port is arranged at the upper part of the taper sleeve mold and used for injecting glue into the pouring cavity. It is noted that during die filling, compressed air is required to be blown clean, and after careful inspection to confirm that no impurities exist, a glue injection port can be arranged for die closing. The taper sleeve mold is used in a vacuum environment, and is usually carried out in an oven.
3 preparation of the Process-mixing
The filler treated in the step 2 is divided into two parts according to the proportioning requirement, in the embodiment, the filler is divided into two parts, one part of the filler and the epoxy resin base material treated in the step 2 are added into a premixing tank A together for stirring and mixing, then vacuum degassing treatment is carried out, the other part of the filler and the curing agent prepared in the step 1 are added into a premixing tank B together for stirring and mixing, then the premixing colloid subjected to vacuum degassing treatment in the premixing tank A and the premixing tank B, and the accelerator prepared in the step 1 and the color paste are added into a final mixing tank together for stirring and mixing, and then vacuum degassing treatment is carried out after sizing material is formed. Notably, the epoxy resin base may be added to only premix A tanks and the curing agent may be added to only premix B tanks. Wherein the temperature of the vacuum degassing treatment in the premixing A tank is 65-70 ℃, the vacuum degree is 100-300Pa, and the treatment time is 4-6h; the temperature of vacuum degassing treatment in the premixing tank B is 65-70 ℃, the vacuum degree is 200-400Pa, and the treatment time is 3-5h; the temperature of the vacuum degassing treatment in the final mixing tank is 65-70 ℃, the vacuum degree is 50-250Pa, and the treatment time is 0.5-2h. In the embodiment, the temperature of the vacuum degassing treatment in the premixing tank A is 70 ℃, the vacuum degree is 100Pa, and the treatment time is 5.5 hours; the temperature of vacuum degassing treatment in the premixing tank B is 70 ℃, the vacuum degree is 200Pa, and the treatment time is 4.5 hours; the temperature of the vacuum degassing treatment in the final mixing tank is 70 ℃, the vacuum degree is 50Pa, and the treatment time is 1.5h.
When the production of the prepared sizing material is less and the film degassing can not be promoted, the epoxy resin base material treated in the step 2, the filler, the curing agent prepared in the step 1, the accelerator and the color paste are added into a final mixing tank together for stirring and mixing, and the vacuum degassing treatment is carried out after the sizing material is formed. At this time, the final mixing tank is subjected to vacuum degassing at 65-70deg.C and vacuum of 20-80Pa for more than 4 hours, usually 4-6 hours, with no bubbles. In the actual production process, the vacuum degassing of the sizing material needs to ensure the minimum degassing time. In this example, the final mixing tank was subjected to vacuum degassing treatment at a vacuum degree of 50Pa for a treatment time of 5 hours.
If the secondary batching production is not carried out within 12 hours, the final mixing tank needs to be cleaned in time, so that the pipeline is prevented from being blocked or solidification risk is prevented.
4, injecting glue
The top of the final mixing tank is provided with a degassing umbrella, the bubble condition in the final mixing tank can be observed through a glass window, and after the observation, the situation that no bubble exists on the degassing umbrella is confirmed, the glue injection can be started. Injecting the sizing material in the final mixing tank into the taper sleeve mold preheated in the step 2 in a pouring mode, and pouring according to a gravity pouring principle, wherein the sizing material in the final mixing tank is injected into the taper sleeve mold through a glue injection port at the upper end of the taper sleeve mold, and the taper sleeve mold is fully pressed downwards by the gravity of the sizing material. During pouring, the stirring should be stopped.
After casting, pressure maintaining treatment is needed, wherein the temperature of the pressure maintaining treatment is 65-70 ℃, the vacuum degree is 50-250Pa, the treatment time is 0.5-2h, the temperature of the pressure maintaining treatment in the embodiment is 65 ℃, the vacuum degree is 80Pa, and the treatment time is 2h; and (5) after pressure maintaining treatment, transferring into an oven for curing.
5 solidifying
Firstly, a small amount of epoxy resin is taken, and DSC analysis (differential scanning calorimetry) is carried out after the epoxy resin is proportioned and cured according to the mixture, so as to obtain a curing curve. In the actual production process, a small amount of the epoxy resin raw material is taken for DSC analysis after each batch of epoxy resin raw material is purchased, whether the difference exists between the DSC analysis and the original curing curve is compared, and then the curing curve is adjusted according to the actual situation.
And curing the sizing material in the taper sleeve mold according to a curing curve, wherein the curing process is divided into three sections, the three sections are maintained after being gradually heated, the parameters are sequentially that the temperature is 80-100 ℃ for 2-3h, the temperature is 100-135 ℃ for 2-3h, and the temperature is 135 ℃ for 12-13h. And demolding the colloid after the three-stage curing is finished, and timely taking heat preservation measures, namely performing post-curing to prevent stress damage to the colloid caused by different shrinkage of different materials due to overlarge temperature difference, wherein the post-curing temperature is 120-130 ℃, the curing time is 10-14h, and the post-curing temperature is 120 ℃ and the curing time is 13h in the embodiment.
The invention is notable that the glue injection port water jacket is arranged at the position of the glue injection port of the taper sleeve mould, and when in curing, the baking oven is opened every 2-3 hours to supplement water through the glue injection port water jacket, so that the curing of the glue near the glue injection port is slower, and the glue is supplemented through the upper gravity in the lower curing process. And (5) taking redundant furnace-following sample materials after solidification, testing the vitrification temperature to obtain the highest tolerance temperature of the products produced by the batch of raw materials, and tracking and recording.
And 6, cleaning colloid corresponding to the position of the glue injection port, removing burrs and burrs, and performing relevant tests according to requirements to finish the preparation of the epoxy resin taper sleeve of the oiled paper capacitor sleeve.
Example two
The second embodiment differs from the first embodiment in that the process temperature, the degree of vacuum or the process time in the process described below in the preparation flow is different. The processing temperature, vacuum degree or processing time in the processing process of this embodiment are specifically as follows:
example III
The third embodiment differs from the first embodiment in that the treatment temperature, the degree of vacuum or the treatment time in the following treatment process in the preparation flow is different. The processing temperature, vacuum degree or processing time in the processing process of this embodiment are specifically as follows:
the epoxy resin taper sleeve prepared by the invention has the advantages of reliable electrical property, high mechanical strength, difficult fragmentation, short production period and the like, thereby improving the overall performance of the oilpaper capacitor sleeve, reducing the overall production period of the oilpaper capacitor sleeve, simultaneously reducing the faults of a transformer, greatly improving the market competitiveness of products and having wide application prospect.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The preparation method of the epoxy resin taper sleeve of the oiled paper capacitor sleeve is characterized by comprising the following steps of:
taking an epoxy resin material as a base material, and preparing a corresponding curing agent, an accelerator, a filler and color paste according to the mass ratio of the mixture; wherein, the mixture mass ratio of the epoxy resin base material, the curing agent, the accelerator, the filler and the color paste is 1:0.5-1.2:0.1-0.3%:2-5:0.03-0.1;
sequentially carrying out drying and degassing and preheating and degassing treatment on the filler prepared in the step 1, and carrying out preheating treatment on the epoxy resin base material prepared in the step 1; simultaneously, after the taper sleeve mold is coated with a release agent, subjected to high-temperature treatment, die-loaded and die-assembled in sequence, the taper sleeve mold is subjected to preheating treatment, the taper sleeve mold adopts a steel gravity casting mold, and comprises an outer mold and a mold core, a casting cavity is formed between the outer mold and the mold core, and a glue injection port is formed in the upper part of the taper sleeve mold and used for injecting glue into the casting cavity;
dividing the filler treated in the step 2 into two parts according to a proportion, adding one part of the filler and the epoxy resin base material treated in the step 2 into a premixing tank A together, stirring and mixing, then carrying out vacuum degassing treatment, adding the other part of the filler and the curing agent prepared in the step 1 into a premixing tank B together, stirring and mixing, then carrying out vacuum degassing treatment, adding the premixed colloid subjected to vacuum degassing treatment in the premixing tank A and the premixing tank B, and adding the accelerator prepared in the step 1 and the color paste into a final mixing tank together, stirring and mixing, and then carrying out vacuum degassing treatment;
or directly adding the epoxy resin base material treated in the step 2, the filler and the curing agent, the accelerator and the color paste prepared in the step 1 into a final mixing tank together, stirring and mixing, and then carrying out vacuum degassing treatment;
after no bubbles are confirmed on a degassing umbrella of the final mixing tank, injecting the sizing material in the final mixing tank into the taper sleeve mold preheated in the step 2 through a glue injection port, and performing pressure maintaining treatment after pouring is finished;
solidifying the colloid in the taper sleeve mold according to the solidifying curve after the pressure maintaining is finished, demolding the colloid after the solidifying is finished, and performing post-solidifying on the demolded colloid;
and 6, cleaning colloid corresponding to the position of the glue injection port, removing burrs and burrs, and performing relevant tests according to requirements to finish the preparation of the epoxy resin taper sleeve of the oiled paper capacitor sleeve.
2. The method for preparing the epoxy resin taper sleeve of the oiled paper capacitor bushing according to claim 1, which is characterized by comprising the following steps:
in the step 1), the filler is silicon powder;
the mass ratio of the mixture of the epoxy resin base material, the curing agent, the accelerator, the silicon powder and the color paste is 1:0.9:0.15%:3.2:0.05.
3. the method for preparing the epoxy resin taper sleeve of the oiled paper capacitor bushing according to claim 2, which is characterized by comprising the following steps:
in the step 2, the temperature of the filler for drying and degassing treatment is 150-180 ℃, the vacuum degree is 600-1500Pa, and the treatment time is 6-10h; the temperature of the filler preheating and degassing treatment is 80-100 ℃, the vacuum degree is 600-1500Pa, and the treatment time is 4-6h;
the temperature of the preheating treatment of the epoxy resin base material is 50-70 ℃ and the treatment time is 6-10h;
the high-temperature treatment temperature of the taper sleeve mold is 120-130 ℃, and the treatment time is 2-4h; the taper sleeve mold is preheated by an oven, the temperature is 100-120 ℃, and the treatment time is 4-6h.
4. The method for preparing the epoxy resin taper sleeve of the oiled paper capacitor bushing according to claim 3, which is characterized by comprising the following steps:
in the step 3, the temperature of vacuum degassing treatment in the premixing A tank is 65-70 ℃, the vacuum degree is 100-300Pa, and the treatment time is 4-6h; the temperature of vacuum degassing treatment in the premixing tank B is 65-70 ℃, the vacuum degree is 200-400Pa, and the treatment time is 3-5h;
when the pre-mixed colloid subjected to vacuum degassing treatment in the pre-mixed tank A and the pre-mixed tank B is added into a final mixing tank, the temperature of the vacuum degassing treatment in the final mixing tank is 65-70 ℃, the vacuum degree is 50-250Pa, and the treatment time is 0.5-2h;
directly adding the epoxy resin base material treated in the step 2, the filler, the curing agent prepared in the step 1, the accelerator and the color paste into a final mixing tank, wherein the temperature of the final mixing tank for vacuum degassing treatment is 65-70 ℃, the vacuum degree is 20-80Pa, and the treatment time is 4-6h.
5. The method for preparing the epoxy resin taper sleeve of the oiled paper capacitor bushing, which is disclosed in claim 4, is characterized in that:
in the step 4, the temperature of the pressure maintaining treatment is 65-70 ℃, the vacuum degree is 50-250Pa, and the treatment time is 0.5-2h.
6. The method for preparing the epoxy resin taper sleeve of the oiled paper capacitor bushing according to claim 5, which is characterized by comprising the following steps:
in step 5), the curing curve is obtained by the following method:
and taking a small amount of epoxy resin in the current use batch, and performing DSC analysis after curing according to the mixture ratio to obtain a curing curve.
7. The method for preparing the epoxy resin taper sleeve of the oiled paper capacitor bushing according to claim 6, which is characterized by comprising the following steps:
in the step 5, the curing process is divided into three sections, the parameters are that the temperature is between 80 and 100 ℃ for 2 to 3 hours, the temperature is between 100 and 135 ℃ for 2 to 3 hours, and the temperature is between 135 ℃ for 12 to 13 hours.
8. The method for preparing the epoxy resin taper sleeve of the oiled paper capacitor sleeve according to any one of claims 1 to 7, which is characterized by comprising the following steps:
in the step 5, the post-curing temperature is 120-130 ℃ and the curing time is 10-14h.
9. The method for preparing the epoxy resin taper sleeve of the oiled paper capacitor bushing according to claim 8, which is characterized by comprising the following steps:
in the step 2, during die filling, the taper sleeve die is blown clean by adopting compressed air, and after careful inspection and confirmation of no impurity, die clamping can be carried out;
in the step 5, water is supplemented through the glue injection port every 2-3h during solidification.
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| CN202311017232.3A CN116844800A (en) | 2023-08-11 | 2023-08-11 | Preparation method of epoxy resin taper sleeve of oiled paper capacitor sleeve |
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