CN115284653A - Preparation method of shielding net - Google Patents
Preparation method of shielding net Download PDFInfo
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- CN115284653A CN115284653A CN202211024357.4A CN202211024357A CN115284653A CN 115284653 A CN115284653 A CN 115284653A CN 202211024357 A CN202211024357 A CN 202211024357A CN 115284653 A CN115284653 A CN 115284653A
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- shielding net
- shielding
- epoxy resin
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- solid insulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D28/00—Producing nets or the like, e.g. meshes, lattices
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- 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
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- 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
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- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The application discloses a preparation method of a shielding net, bisphenol A epoxy resin is used as a pouring base material, a curing agent and a filler are added, the pouring material is injected into an APG mold, the pouring material is sequentially subjected to heating forming process treatment, curing process treatment and zinc spraying process treatment, the prepared shielding net is excellent in insulating property, the shielding effect of the shielding net is greatly improved, a zinc layer and the shielding net mold are adaptive in shape and can completely cover the surface layer of the shielding net mold, the prepared shielding net is good in shape and size controllability, the deformation of the shielding net is small, the use size and shape requirements of parts of a solid insulating ring main unit can be met, the shielding net is poured into the solid insulating part, and then the solid insulating part is installed in the solid insulating main unit, so that the problems of poor insulating property and reliability of the solid insulating ring main unit caused by shrinkage of the shielding net and poor insulating property are solved, and the long-term safe and stable operation of the solid insulating ring main unit can be guaranteed.
Description
Technical Field
The application relates to the technical field of power electricity, in particular to a preparation method of a shielding net.
Background
The solid insulation ring main unit is a ring main unit which adopts a solid insulation material as a main insulation medium, a vacuum arc extinguish chamber, a conductive connection part, an isolation and grounding switch, a main bus, a branch bus and other parts of the vacuum arc extinguish chamber are completely coated and sealed by the solid insulation medium to form an insulation structure with full insulation and full sealing performance, a conductive or semiconductive shielding layer is coated on the surface of a structure which is manually accessible, the insulation structure is directly and reliably grounded, the solid insulation ring main unit is an electrical device which is sealed in a grounded metal shell after all the components are completely assembled, and the insulation outer surface of the solid insulation ring main unit is grounded through a box body.
The shielding net is a core component of the solid insulation ring main unit, so that the insulation performance and reliability of the solid insulation assembly can be improved, and the long-term safe and stable operation of the solid insulation ring main unit is ensured. However, in the prior art, the regular net rings are usually made of metal materials; for irregular shielding nets, semiconductive nylon is generally adopted and prepared through an injection molding process, and because the semiconductive nylon has large deformation amount when the temperature changes in the process of treating the semiconductive nylon through a heating injection molding process, particularly when the shielding nets with the size larger than 100mm are prepared, the semiconductive nylon material is easy to deform in the process of treating the heating injection molding process, the appearance size of the irregular shielding nets prepared through the semiconductive nylon injection molding is difficult to control, the qualified rate of the shielding nets is low, the production cost is high, the prepared shielding nets cannot meet the requirements of the use sizes and the shapes of solid insulating cabinet parts, and meanwhile, the insulation property and the reliability of the shielding nets prepared through the semiconductive nylon material are poor, so that the long-term safe and stable operation of the solid insulating cabinet is difficult to guarantee.
Disclosure of Invention
In order to solve the problems that the shielding net in the prior art is easy to deform in the heating injection molding process, the deformation of the manufactured shielding net is large, the shape and the size are difficult to control, the requirements on the use size and the shape of a solid insulating ring main unit part cannot be met, the insulation and the reliability of the shielding net are poor, and the long-term safe and stable operation of the solid insulating ring main unit is difficult to solve, the invention uses bisphenol A epoxy resin as a casting base material to prepare a shielding net module through an APG injection molding process, and then performs zinc spraying treatment on the shielding net module, wherein the thickness of a zinc layer is 10-15 mu m, so that the shielding net is prepared, the insulation and the reliability of the shielding net are greatly improved, the size and the shape of the manufactured shielding net are controllable, the requirements on the use size and the shape of the solid insulating ring main unit part can be met, and the production cost is reduced.
The invention discloses a preparation method of a shielding net, which comprises the following steps:
(1) Preparing an APG mould with the same size as the shielding net;
(2) Pouring the casting material into an APG mold, sequentially carrying out heating forming treatment and heating curing treatment on the casting material, and then demolding and cooling to room temperature to prepare a shielding net module for later use;
(3) Carrying out steel grit blasting treatment on the shielding net module by using a sand blasting machine, wherein the size of the steel grit is 20-30 meshes, and then cleaning the shielding net module subjected to the steel grit blasting treatment by using ethanol;
(4) And heating the cleaned shielding net module, and then spraying zinc on the shielding net module to prepare the shielding net.
In one embodiment of the invention, the casting material comprises bisphenol A epoxy resin, a curing agent and a filler; the mass ratio of the bisphenol A epoxy resin to the curing agent to the filler is 1:1:3-5;
in one embodiment of the invention, the bisphenol A epoxy resin comprises one of E-44 epoxy resin, E-51 epoxy resin, E54 epoxy resin and E55 epoxy resin;
in one embodiment of the present invention, the curing agent comprises one of phthalic anhydride, trimellitic anhydride, and methyl tetrahydrophthalic anhydride;
the filler comprises one of nano silicon dioxide and nano titanium dioxide, and the particle size of the nano silicon dioxide and the nano titanium dioxide is 30nm-1 μm;
in one embodiment of the invention, the temperature of the thermoforming treatment in the step (2) is 145-155 ℃;
in one embodiment of the invention, the heating curing treatment temperature and time in the step (2) are 110-130 ℃/12-17h;
in one embodiment of the invention, the temperature and time for heating the cleaned shielding net module in the step (4) are 70-75 ℃/2-2.5h;
in one embodiment of the invention, the shielding mesh module is subjected to zinc spraying treatment in the step (4), and the thickness of the zinc layer is 10-15 μm; the zinc spraying treatment temperature is 70-75 ℃;
in one embodiment of the invention, the shielding net module is subjected to zinc spraying treatment in the step (4), and the resistance between meshes of the prepared shielding net is 5-20 Ω;
in conclusion, in the heating forming treatment process, the semi-conductive nylon is adopted as a casting base material, the shielding net is subjected to heating forming treatment to obtain a large deformation amount and poor insulativity, the shielding net is cast in a solid insulation ring main unit, the shielding net can shrink to cause the partial discharge value of a solid insulation part to be increased and the insulativity to be poor, and then the solid insulation part with poor insulativity is installed in the solid insulation cabinet, so that the insulativity and reliability of the solid insulation cabinet are reduced, and the long-term safe and stable operation of the solid insulation ring main unit is difficult to ensure; the zinc layer and the shielding net module are adaptive in shape and can completely coat the surface layer of the shielding net module, so that the deformation of the manufactured shielding net is small, the manufactured shielding net is poured into the solid insulating part, the problem that the local discharge value of the solid insulating part is overlarge due to the shrinkage of the shielding net can be avoided, the insulating property and the reliability of the solid cabinet are influenced, the shape and the size of the shielding net are good in controllability, and the requirements on the use size and the shape of the solid insulating ring main unit can be met.
Meanwhile, the shielding net uses epoxy resin as a pouring base material, the manufactured shielding net is poured in a solid insulating part and is not easy to shrink, the shielding net is poured into the solid insulating part, the problem that the shrinkage of the shielding net causes the local discharge value of the solid insulating part to be overlarge is solved, then the solid insulating part is installed in a solid insulating cabinet, the problem that the solid insulating ring main unit is poor in insulating property and reliability can be solved, and the manufactured shielding net can guarantee the long-term safe and stable operation of the solid insulating cabinet.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a structural diagram of a solid insulating member for a solid insulating ring main unit prepared by adopting an APG process according to the present invention;
FIG. 2 is a structural view of a shielding net cast into a solid insulating member according to a second embodiment of the present invention;
FIG. 3 is a structural diagram of a shielding net according to a second embodiment of the present invention;
FIG. 4 is a structural view of a shielding net according to a comparative example of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the following embodiments.
Example one
(1) Preparing an APG mould with the same size as the shielding net;
(2) Injecting the casting material into an APG mould, carrying out heating forming treatment on the casting material at the temperature of 145 ℃, and then carrying out heating curing treatment at the temperature and for the time of 110 ℃/12h; then demoulding and cooling to room temperature to prepare a shielding net module for later use;
(3) Carrying out steel grit blasting treatment on the shielding net module by using a sand blasting machine, wherein the size of steel grit is 20 meshes, and then cleaning the shielding net module subjected to steel grit blasting treatment by using 95% ethanol;
(4) And (3) heating the cleaned shielding net module at the temperature and for 70 ℃/2h, spraying zinc to the shielding net module at the temperature of 70 ℃, wherein the thickness of a zinc layer is 10 mu m, preparing the shielding net, and testing the resistance between meshes of the shielding net to be 5 omega by using a universal meter.
The castable consists of E-51 epoxy resin, phthalic anhydride and nano silicon dioxide, wherein the mass ratio of the E-51 epoxy resin to the phthalic anhydride to the nano silicon dioxide is 1:1:3.5; the particle size of the nano silicon dioxide is 30nm-1 μm.
Example two
(1) Preparing an APG mould with the same size as the shielding net;
(2) Pouring the casting material into an APG mould, carrying out heating forming treatment on the casting material at the temperature of 150 ℃, and then carrying out heating curing treatment at the temperature of 120 ℃/14h; then demoulding and cooling to room temperature to prepare a shielding net module for later use;
(3) Carrying out steel grit blasting treatment on the shielding net module by using a sand blasting machine, wherein the size of steel grit is 25 meshes, and then cleaning the shielding net module subjected to steel grit blasting treatment by using 95% ethanol;
(4) And (3) heating the cleaned shielding net module at the temperature of 72 ℃/2.2h, spraying zinc on the shielding net module at the temperature of 72 ℃, wherein the thickness of a zinc layer is 13 mu m, preparing the shielding net, and testing the resistance between meshes of the shielding net to be 10 omega by using a universal meter.
The castable is composed of E-44 epoxy resin, methyl tetrahydrophthalic anhydride and nano silicon dioxide, wherein the mass ratio of the E-51 epoxy resin to the methyl tetrahydrophthalic anhydride to the nano silicon dioxide is 1:1:4; the particle size of the nano silicon dioxide is 30nm-1 μm.
EXAMPLE III
(1) Preparing an APG mould with the same size as the shielding net;
(2) Pouring the casting material into an APG mould, carrying out heating forming treatment on the casting material at the temperature of 155 ℃, and then carrying out heating curing treatment at the temperature of 130 ℃/17h; then demoulding and cooling to room temperature to prepare a shielding net module for later use;
(3) Carrying out steel grit blasting treatment on the shielding net module by using a sand blasting machine, wherein the size of the steel grit is 30 meshes, and then cleaning the shielding net module subjected to the steel grit blasting treatment by using 95% ethanol;
(4) And (3) heating the cleaned shielding net module at 75 ℃/2.5h, spraying zinc on the shielding net module at 75 ℃ until the thickness of a zinc layer is 15 mu m, preparing the shielding net, and testing the resistance between meshes of the shielding net to be 20 omega by using a universal meter.
The castable consists of E-54 epoxy resin, trimellitic anhydride and nano-silica, wherein the mass ratio of the E-54 epoxy resin to the trimellitic anhydride glyceride to the nano-titania is 1:1:4.5; the particle size of the nano silicon dioxide is 30nm-1 μm.
Comparative example 1
The difference between the specific implementation mode and the first embodiment is that the casting material is semiconductive nylon.
Comparative example No. two
The difference between the specific implementation manner and the second embodiment is that the castable is semiconductive nylon.
Comparative example No. three
The difference between the specific implementation mode and the third embodiment is that the casting material is semiconductive nylon.
And (3) performance testing:
as shown in fig. 1, five identical solid insulating members for solid insulating ring main units are prepared by adopting a common APG casting process (a casting material is injected into an APG mold, is subjected to heating forming and curing treatment, is cooled to room temperature after demolding), as shown in fig. 2, the shielding net prepared in the second embodiment is cast into the first solid insulating member for solid insulating ring main units, the casting material is epoxy resin, and solid insulating members with the shielding net are prepared.
Adopt power frequency withstand voltage tester, open the oscilloscope, power frequency withstand voltage tester is bought from shanghai song bao electricity, and the partial discharge value of the solid insulation spare that has the shielding net among test example one to three and comparative example one to three, the test result is seen in table 1:
table 1: examples one to three and comparative examples one to three partial discharge values of solid insulators each cast with a shielding mesh
According to the performance test results of the comparative example and the comparative example, bisphenol A epoxy resin is used as a casting material, the resistance between meshes of the prepared shielding net is 5-20 omega through an APG injection molding process, a heating forming process and zinc spraying treatment are carried out, the thickness of a zinc layer is controlled to be 10-15 mu m, the zinc layer is controlled, the shielding effect of the shielding net is greatly improved, the shielding net has better insulating property, the shielding net is poured into the solid insulating member for the solid insulating ring main unit, the solid insulating member with the shielding net is prepared, the partial discharge value of the solid insulating member with the shielding net can reach 1PC at least, and the test standard shows that when the partial discharge value is less than or equal to 5PC, the insulating property of the insulating member is qualified, compared with the partial discharge value of the solid insulating member with the shielding net prepared by adopting the conventional semi-conductive nylon, the partial discharge value of the solid insulating member with the shielding net is greatly reduced, and the fact that the shielding net prepared by the application has excellent insulating property.
When the shielding net manufactured by the method is poured into the solid insulating part, the insulating property of the solid insulating part is good, and then the solid insulating part is installed in a solid insulating cabinet, the problem that the insulating property and the reliability of the solid insulating cabinet are poor due to the fact that the partial discharge value of the shielding net is too large can be effectively solved.
By comparing the structure diagrams of the shielding net (shown in figure 3) prepared in the second embodiment of the invention and the shielding net (shown in figure 4) prepared in the second embodiment of the invention, the bisphenol A epoxy resin is used as a casting base material, the deformation of the shielding net prepared by an APG injection molding process is very small, the shape and the size of the prepared shielding net are good in controllability, the requirements on the use size and the shape of a solid insulating cabinet part can be met, the shielding net is cast into a solid insulating part, and then the solid insulating part is installed in the solid insulating cabinet, so that the problem that the local discharge value of the solid insulating cabinet is increased due to the shrinkage of the shielding net can be solved. And the second comparative example adopts semi-conductive nylon as a pouring base material, the deformation of the shielding net is large after the semi-conductive nylon is treated by a heating forming process, the bending degree of the central axes of the parts on two sides of the shielding net is large, the shielding net is poured into the solid insulating part, then the solid insulating part is installed in the solid insulating cabinet, the shielding net can shrink, the partial discharge value of the solid insulating cabinet is increased, the insulativity and reliability of the solid insulating cabinet are greatly reduced, and the long-term safe and stable operation of the insulating cabinet is difficult to ensure.
The present application has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to limit the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the presently disclosed embodiments and implementations thereof without departing from the spirit and scope of the present disclosure, and these fall within the scope of the present disclosure. The protection scope of this application is subject to the appended claims.
Claims (10)
1. The preparation method of the shielding net is characterized by comprising the following steps of:
(1) Preparing an APG mould with the same size as the shielding net;
(2) Pouring the casting material into an APG mold, sequentially carrying out heating forming treatment and heating curing treatment on the casting material, and then demolding and cooling to room temperature to prepare a shielding net module for later use;
(3) Carrying out steel grit blasting treatment on the shielding net module by using a sand blasting machine, wherein the size of the steel grit is 20-30 meshes, and then cleaning the shielding net module subjected to the steel grit blasting treatment by using ethanol;
(4) And heating the cleaned shielding net module, and then spraying zinc on the shielding net module to prepare the shielding net.
2. The method for preparing shielding mesh according to claim 1, wherein the casting material comprises bisphenol a epoxy resin, a curing agent, a filler; the mass ratio of the bisphenol A epoxy resin to the curing agent to the filler is 1:1:3-5.
3. The method of claim 1, wherein the bisphenol a epoxy resin comprises one of E-44 epoxy resin, E-51 epoxy resin, E54 epoxy resin, and E55 epoxy resin.
4. The method of claim 1, wherein the curing agent comprises one of phthalic anhydride, trimellitic anhydride, and methyl tetrahydrophthalic anhydride.
5. The method for preparing the shielding net according to claim 1, wherein the filler comprises one of nano silica and nano titania, and the particle size of the nano silica and the nano titania is 30nm to 1 μm.
6. The method for preparing a shielding net according to claim 1, wherein the thermoforming treatment temperature in the step (2) is 145-155 ℃.
7. The method for preparing shielding net according to claim 1, wherein the heating curing treatment temperature and time in the step (2) are 110-130 ℃/12-17h.
8. The method for preparing shielding net according to claim 1, wherein the temperature and time for heating the cleaned shielding net module in the step (4) are 70-75 ℃/2-2.5h.
9. The method for preparing shielding mesh according to claim 1, wherein the shielding mesh module is subjected to zinc spraying treatment in the step (4), and the thickness of the zinc layer is 10 μm to 15 μm.
10. The method for preparing a shielding net according to claim 1, wherein the shielding net module is subjected to zinc spraying treatment in the step (4), and the resistance between meshes of the prepared shielding net is 5-20 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211024357.4A CN115284653A (en) | 2022-08-25 | 2022-08-25 | Preparation method of shielding net |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211024357.4A CN115284653A (en) | 2022-08-25 | 2022-08-25 | Preparation method of shielding net |
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| Publication Number | Publication Date |
|---|---|
| CN115284653A true CN115284653A (en) | 2022-11-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211024357.4A Pending CN115284653A (en) | 2022-08-25 | 2022-08-25 | Preparation method of shielding net |
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| CN (1) | CN115284653A (en) |
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- 2022-08-25 CN CN202211024357.4A patent/CN115284653A/en active Pending
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