CN113393983A - Preparation method of composite insulator with hard material layer for reinforcing core rod - Google Patents
Preparation method of composite insulator with hard material layer for reinforcing core rod Download PDFInfo
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- CN113393983A CN113393983A CN202110785334.4A CN202110785334A CN113393983A CN 113393983 A CN113393983 A CN 113393983A CN 202110785334 A CN202110785334 A CN 202110785334A CN 113393983 A CN113393983 A CN 113393983A
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- 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
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
- H01B19/04—Treating the surfaces, e.g. applying coatings
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- Insulators (AREA)
- Insulating Bodies (AREA)
Abstract
The invention discloses a preparation method of a composite insulator of a hard material layer reinforced core rod, wherein the hard material of the hard material layer comprises the following components in parts by weight: 100 parts of alicyclic epoxy resin, 30-50 parts of plastic, 20-40 parts of methyl hexahydrophthalic anhydride curing agent, 10-15 parts of aluminum trihydrate micropowder flame retardant, 1-2 parts of silanization coupling agent and 2-10 parts of fluoride auxiliary agent; the preparation method comprises the following steps: inserting an insulating core rod into a central hole of the hardware fitting, and then forming a whole body by crimping or gluing; putting the insulating core rod-hardware fitting composite body into a die, and forming a hard material layer on the outer surface of the core rod; and forming a silicone rubber sheath and a silicone rubber shed outside the insulating core rod-hardware fitting composite body with the hard material layer to obtain the composite insulator of the hard material layer reinforced core rod. The reinforced core rod is wrapped by the hard material layer, and the silicon rubber sheath and the umbrella skirt are adopted, so that the composite insulator has the characteristics of high hardness, corrosion resistance, bird pecking resistance and the like, and the performance of the composite insulator is further improved.
Description
Technical Field
The invention belongs to the technical field of insulator manufacturing, and particularly relates to a preparation method of a composite insulator of a novel hard material layer reinforced core rod.
Background
The composite insulator has the advantages of small volume, light weight, high pollution-resistant lightning voltage and the like, and is widely used in a power system. With the wide use of composite insulators, the composite insulators on the power transmission lines are often pecked by birds, and the birds peck the composite insulators to cause damage to the composite insulators. The main parts of the bird pecking the composite insulator are the composite insulator umbrella skirt and the sheath. Birds peck the umbrella skirt of the composite insulator to cause the penetration through hole or partial tearing of the umbrella skirt, thereby reducing the creepage distance of the composite insulator and influencing the external insulation performance of the composite insulator; when birds peck the composite insulator sheath, the sheath is abraded, the core rod is exposed, the end seal is damaged, and under high-humidity weather conditions such as rainy days and foggy days, partial arc discharge is easily generated between the exposed core rod and the damped sheath interface, so that the core rod generates electrochemical reaction. In more serious conditions, the insulator pecked by birds may be damaged by brittle failure or other serious accidents.
In order to prevent various accidents caused by bird pecking, the composite insulator is partially made of hard materials, but the selection of the hard materials, how to integrate the hard materials into the composite insulator and the manufacturing process have great influence on the performance of the composite insulator.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide the preparation method of the composite insulator of the hard material layer reinforced core rod.
The invention adopts the following technical scheme:
a preparation method of a composite insulator of a hard material layer reinforced core rod comprises a silicon rubber umbrella skirt (1), a silicon rubber sheath (2), a core rod (3), a hardware fitting (5) and a hard material layer (4);
the core rod is positioned at the innermost part of the insulator; the hard material layer covers the outer surface of the mandrel; the silicone rubber sheath wraps the outer side of the hard material layer, and the silicone rubber umbrella skirt is arranged on the outer side of the silicone rubber sheath; the hardware is positioned at two ends of the composite insulator, and the core rod is positioned in a central hole of the hardware;
the hard material of the hard material layer comprises the following components in parts by weight: 100 parts of alicyclic epoxy resin, 30-50 parts of plastic, 20-40 parts of methyl hexahydrophthalic anhydride curing agent, 10-15 parts of aluminum trihydrate micropowder flame retardant, 1-2 parts of silanization coupling agent and 2-10 parts of fluoride auxiliary agent;
the preparation method comprises the following steps:
step 1, inserting an insulating core rod into a central hole of a hardware fitting, and then forming an integral body by compression bonding or gluing to obtain an insulating core rod-hardware fitting composite body;
and 3, forming a silicone rubber sheath and a silicone rubber shed outside the insulating core rod-hardware fitting complex with the hard material layer to obtain the composite insulator of the hard material layer reinforced core rod.
Preferably, step 2 further comprises, after the step of,
step 2-1, weighing the raw materials of the hard material layer according to the following weight ratio: 100 parts of alicyclic epoxy resin, 30-50 parts of plastic, 20-40 parts of methyl hexahydrophthalic anhydride curing agent, 10-15 parts of aluminum trihydrate micropowder flame retardant, 1-2 parts of silanization coupling agent and 2-10 parts of fluoride auxiliary agent, and placing the materials into a vacuum stirring kettle for stirring and degassing, wherein the vacuum degree is less than 0.5kPa, the mixing temperature is 30-40 ℃, and the stirring and degassing time is 120min to obtain mixed gel;
step 2-2, keeping the temperature of the mold at 110-130 ℃, keeping the vacuum degree in the mold cavity at less than 0.1kPa, injecting the mixed gel into the mold cavity at a fixed pressure of 0.3-0.5 MPa, and keeping the pressure for injection for 30-45 min and curing for 30 min;
and 2-3, demolding, removing the flash and obtaining the insulating core rod-hardware fitting composite body with the hard material layer on the outer surface.
Preferably, the raw material of the hard material layer is pretreated to remove moisture, gas and volatile substances therein before the material mixing in step 2-1.
Preferably, step 3 further comprises, after the step of,
step 3-1, polishing the surface of the hard material layer on the surface of the insulating core rod-hardware fitting composite body in the step 2, coating an adhesive, and putting the hard material layer into an oven for preheating, wherein the preheating temperature is 60-80 ℃, and the preheating time is 45-60 min;
and 3-2, putting the preheated insulation core rod-hardware fitting complex with the hard material layer in the step 3-1 into a mold, injecting and plasticizing a silicon rubber raw material at the plasticizing temperature of 150-250 ℃ and the injection pressure of 15-80 MPa, and demolding to form a silicon rubber sheath and a silicon rubber shed, thus obtaining the composite insulator of the hard material layer reinforced core rod.
Preferably, the plastic comprises one or more of polyethylene, polypropylene, polystyrene, polyamide, polycarbonate.
Preferably, the aluminum trihydrate micropowder comprises 70 weight percent of alumina and 30 weight percent of titanium dioxide.
Preferably, the core rod is made of glass fiber and epoxy resin.
Preferably, the silicon rubber sheath and the silicon rubber shed are made of a silicon rubber material, and the silicon rubber sheath and the silicon rubber shed are wrapped on the outer side of the hard material layer in a one-time injection molding mode.
Preferably, the silicon rubber umbrella skirt is of an equal-diameter umbrella skirt structure, a large-small umbrella skirt structure, a two-small umbrella skirt structure or a large-small-medium umbrella skirt structure.
The invention has the advantages that compared with the prior art,
(1) according to the composite insulator, the core rod of the reinforced composite insulator is wrapped by the hard material layer, the core rod is prevented from being directly exposed by the high-strength corrosion-resistant hard material layer, the running stability of the composite insulator is greatly improved, and meanwhile, the composite insulator of the core rod reinforced by the hard material layer has excellent anti-pollution flashover capability and bird pecking resistance by adopting the silicone rubber material sheath and the umbrella skirt with optimal hydrophobicity and hydrophobicity migration;
(2) the hard material layer adopts alicyclic epoxy resin, and has better dielectric property, weather resistance and ultraviolet radiation resistance compared with the traditional bisphenol A type epoxy resin; by adding polyolefin and other plastic raw materials, compared with the traditional epoxy resin formula, the proportion of inorganic filler in the mixed material is greatly reduced; by adding methyl hexahydrophthalic anhydride as a curing agent, the alicyclic epoxy resin is fully cured in an anhydride system, and meanwhile, an amine curing agent with high toxicity and high volatility can be avoided; the hard material of the invention ensures that the material mixing has the advantages of easy stirring, uniform material curing, short curing time and the like;
(3) the preparation method disclosed by the invention is simple in preparation process, greatly improves the compactness of the internal structure of the hard material layer, reduces the internal stress, improves the insulating property, the mechanical strength, the dimensional precision and the uniformity of a workpiece, is short in gel curing time, greatly improves the utilization rate of a die, shortens the production period, and is high in production efficiency, low in product cost and low in labor intensity.
Drawings
Fig. 1 is a schematic view showing a specific structure of a composite insulator in which a hard material layer reinforces a core rod according to the present invention.
Fig. 2 is a schematic diagram of a shed structure of a composite insulator of the hard material layer reinforced core rod, wherein 2-1 is an equal-diameter shed structure, 2-2 is a large-small shed structure, 2-3 is a large-two-small shed structure, and 2-4 is a large-medium-small shed structure.
Fig. 3 is a flow chart of a method for manufacturing a composite insulator of the hard material layer reinforced core rod according to the present invention.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
As shown in fig. 1, the composite insulator of the hard material layer reinforced core rod of the present invention includes a silicon rubber shed 1, a silicon rubber sheath 2, a core rod 3, a hard material layer 4 and a fitting 5.
The core rod 3 is positioned at the innermost part of the composite insulator, and a hard material layer 4 is wrapped outside the core rod. The core rod 3 is a bearing part of the mechanical load of the composite insulator, is also a main part of internal insulation, is made of glass fiber, epoxy resin and the like, and has excellent mechanical strength, insulating property and long-term stability.
The hard material layer 4 is wrapped on the outer side of the core rod 3 and positioned between the core rod 3 and the silicon rubber sheath 2, and plays roles of insulating, sealing and reinforcing the core rod.
The silicone rubber sheath 2 and the silicone rubber shed 1 are positioned outside the hard material layer 4, and are preferably installed outside the hard material layer 4 through one-time injection molding so as to play a role in further sealing and insulation. The silicon rubber sheath 2 and the silicon rubber umbrella skirt 1 are made of silicon rubber and other materials, and have the characteristics of strong hydrophobicity, pollution flashover resistance, electric erosion resistance and the like. The rubber is silicone rubber, including but not limited to methyl silicone rubber, methyl vinyl phenyl silicone rubber, fluorosilicone rubber, and the like. As shown in fig. 2, the silicon rubber umbrella skirt 1 adopts four umbrella skirt structures, namely an equal-diameter umbrella skirt structure shown in fig. 2-1, a large-small umbrella skirt structure shown in fig. 2-2, a large-two-small umbrella skirt structure shown in fig. 2-3 and a large-medium-small umbrella skirt structure shown in fig. 2-4. Different shed structures have different external insulation characteristics, pollution flashover resistance characteristics and self-cleaning characteristics, and insulators with different shed structures can be selected according to different installation and operation environmental conditions of the insulators so as to meet actual requirements.
The hardware fittings 5 are positioned at two ends of the composite insulator, are made of metal materials and play roles in connection and support.
The long-term operation experience of the common silicon rubber composite insulator shows that the distortion of an electric field in the operation of the insulator caused by pecking the composite insulator by a bird and a shed is weak, the damage is not the most important damage caused by pecking the bird, and the true serious condition is that an insulator core rod is exposed after the sheath is pecked by the bird. Local arc discharge is easily generated between the exposed core rod and the damp sheath interface, so that the core rod generates electrochemical reaction, and the insulator pecked by birds can be subjected to brittle failure and other serious accidents under more serious conditions. Based on the reason, the composite insulator core rod is wrapped and reinforced by the hard material layer, the core rod is prevented from being directly exposed by the high-strength corrosion-resistant hard material layer, the running stability of the composite insulator is greatly improved, and meanwhile, the composite insulator with the hard material layer reinforced core rod has excellent anti-pollution flashover capability and bird pecking resistance by adopting the silicone rubber material sheath and the umbrella skirt with the optimal hydrophobicity and hydrophobicity migration.
When the composite insulator adopts the hard sheath and the umbrella skirt, a gap is easily generated between the hard sheath and the insulating core rod in the transportation and installation processes, and the service life of the composite insulator can be reduced when water vapor enters the gap. And the hydrophobicity mobility of the hard sheath and the umbrella skirt are far lower than those of silicon rubber materials, so that the self-cleaning performance after dirt accumulation is poor, and pollution flashover is easily caused. When the composite insulator adopts the silicon rubber sheath and the umbrella skirt, although the pollution flashover probability is greatly reduced, the composite insulator does not have the bird pecking prevention capability and is greatly influenced by bird damage. The core rod is reinforced by the hard material layer, and the silicon rubber umbrella skirt and the sheath are matched, so that the core rod has excellent external insulation performance and bird pecking prevention capability.
Furthermore, the hard material layer 4 is made of alicyclic epoxy resin and plastic materials as matrixes, and is supplemented with methyl hexahydrophthalic anhydride curing agent, aluminum trihydrate micropowder flame retardant, silanization coupling agent, fluoride auxiliary agent and the like, has the characteristics of high hardness, impact resistance, electric arc resistance, bird pecking resistance and the like, can prevent the core rod from being exposed after the composite insulator sheath is pecked by birds, and further avoids accidents such as flashover and the like.
The hard material layer 4 is made of alicyclic epoxy resin, epoxy groups of the alicyclic epoxy resin are directly connected to alicyclic rings, a compact rigid molecular structure can be formed, and the cured product has high crosslinking density, so that the thermal deformation temperature is high, the Martin heat-resistant temperature reaches more than 190 ℃, and the thermal decomposition temperature is higher than 360 ℃. Therefore, the curing shrinkage rate is small, the tensile strength is high, and the thermal stability is good. Because no chlorine and sodium ions are contained in the synthesis process, the alicyclic epoxy resin has better dielectric property, and is better than the traditional bisphenol A epoxy resin in terms of specific resistance and dielectric loss tangent value. And is different from the traditional bisphenol A type epoxy resin, the molecular structure of the alicyclic epoxy resin does not contain benzene rings, so the alicyclic epoxy resin has better weather resistance and ultraviolet radiation resistance than the bisphenol A type epoxy resin.
The hard material layer 4 is added with plastic raw materials such as polyolefin, and compared with the traditional epoxy resin formula, the proportion of inorganic filler in the mixed material is greatly reduced. The reactivity of the alicyclic epoxy resin to acid anhydrides is higher than that of the traditional amines, the alicyclic epoxy resin is fully cured in an anhydride system by adding methyl hexahydrophthalic anhydride as a curing agent, and meanwhile, the amine curing agent with high toxicity and volatility can be avoided.
The hard material of the hard material layer 4 comprises the following components in parts by weight: 100 parts of alicyclic epoxy resin, 30-50 parts of plastic, 20-40 parts of methyl hexahydrophthalic anhydride curing agent, 10-15 parts of aluminum trihydrate micropowder flame retardant, 1-2 parts of silanization coupling agent and 2-10 parts of fluoride auxiliary agent.
When the content of the curing agent in the components is increased, the initial viscosity of the mixed material is reduced, the fluidity is strong, and the mixing is facilitated, but the viscosity is too low due to the excessively high content of the curing agent, and the inorganic filler is settled and layered, so that the uniformity of the cured material is influenced. When the content of the inorganic filler in the components is too high, the mixed material is difficult to stir and degas. Therefore, by controlling the proportion of each component in the raw material formula of the hard material, particularly the alicyclic epoxy resin, the plastic, the curing agent and the aluminum trihydrate micropowder, the mixed material has better effects in the stages of stirring, injection, curing and the like.
The alicyclic epoxy resin comprises but is not limited to poly [ (2-ethylene oxide) -1, 2-cyclohexanediol ] 2-ethyl-2- (hydroxymethyl) -1, 3-propylene glycol ether, and has the advantages of good thermal stability, good weather resistance, good electrical insulation performance, good process performance and the like.
The plastic includes, but is not limited to, at least one of polyethylene, polypropylene, polycarbonate, polystyrene, and polyamide.
The methyl hexahydrophthalic anhydride is a curing agent and has the advantages of low melting point, low viscosity of a complex formed by the methyl hexahydrophthalic anhydride and alicyclic epoxy resin, long service life, high heat resistance of a cured product, good high-temperature electrical property and the like.
The aluminum trihydrate micropowder flame retardant comprises 70 weight percent of alumina and 30 weight percent of titanium dioxide. The alumina is alpha-alumina and/or gamma-alumina, and one preferable scheme is composed of 50 weight percent of alpha-alumina and 50 weight percent of gamma-alumina.
The silane coupling agent is an organic silicon compound with two different chemical properties simultaneously contained in a molecule, and is used for improving the actual bonding strength of a polymer and an inorganic substance. The dosage of the silane coupling agent is related to the specific surface area of the filler, and a preferable scheme is that the mass of the silane coupling agent is 0.5-2% of that of the organic filler.
The fluoride assistant is not particularly limited.
The core rod is strengthened through the hard material layer, the core rod can be prevented from being exposed after the composite insulator sheath is pecked by birds, and compared with a structure that a silicon rubber sheath is directly wrapped outside a traditional composite insulator core rod, the composite insulator core rod has better sealing property, temperature resistance and corrosion resistance, and has the characteristics of high hardness, impact resistance, bird pecking resistance and the like.
As shown in fig. 3, the method for preparing the composite insulator of the hard material layer reinforced core rod of the invention comprises the following steps:
step 1, inserting an insulating core rod into a central hole of a hardware fitting, and then forming a whole by compression bonding or gluing to obtain an insulating core rod-hardware fitting composite.
And 2, putting the insulating core rod-hardware fitting composite obtained in the step 1 into a die, and forming a hard material layer on the outer surface of the core rod.
step 2-1, weighing the raw materials of the hard material layer according to the following weight ratio: 100 parts of alicyclic epoxy resin, 30-50 parts of plastic, 20-40 parts of methyl hexahydrophthalic anhydride curing agent, 10-15 parts of aluminum trihydrate micropowder flame retardant, 1-2 parts of silanization coupling agent and 2-10 parts of fluoride auxiliary agent, and placing the materials into a vacuum stirring kettle for stirring and degassing, wherein the vacuum degree is less than 0.5kPa, the mixing temperature is 30-40 ℃, and the stirring and degassing time is about 120min to obtain mixed gel;
step 2-2, keeping the temperature of the mold at 110-130 ℃, keeping the vacuum degree in the mold cavity at less than 0.1kPa, injecting the mixed gel into the mold cavity at a fixed pressure of 0.3-0.5 MPa, and keeping the pressure for 30-45 min for injection, wherein the curing time is about 30 min;
and 2-3, demolding, removing the flash and obtaining the insulating core rod-hardware fitting composite body with the hard material layer on the outer surface.
Further, the raw material of the hard material layer is pretreated to remove moisture, gas and volatile substances therein before the material mixing in step 2-1.
In the step 2-2, the mixed material is injected into the die cavity at the gel temperature at room temperature, and the temperature of the die of a workpiece is about 80-100 ℃ higher than that of the mixed material system, so that the gel process of the curing reaction is diffused from the die wall to the middle mixed material. In the whole die punching process, a certain pressure is kept on the die cavity, so that the mixed material is extruded into the die cavity under a fixed pressure to supplement a gap formed by volume shrinkage of a system in a gelling process, the compactness of the internal structure of a cured material is improved, the internal stress is reduced, and the insulating property, the mechanical strength, the size precision and the uniformity of a workpiece are improved. The gel curing time in the preparation process is short, the utilization rate of the die is greatly improved, the production period is shortened, the production efficiency is high, the product cost is low, and the labor intensity is low.
And 3, forming a silicon rubber sheath and a silicon rubber umbrella skirt on the outer side of the insulating core rod-hardware fitting composite body with the hard material layer.
and 3-1, polishing the surface of the hard material layer on the surface of the insulating core rod-hardware fitting composite in the step 2, coating an adhesive, preheating in an oven, comprehensively considering the infiltration effect of the adhesive on the hard material layer and the failure condition of the adhesive, wherein the preheating temperature is 60-80 ℃, and the preheating time is 45-60 min.
And 3-2, putting the preheated insulation core rod-hardware fitting complex with the hard material layer in the step 3-1 into a mold, injecting and plasticizing a silicon rubber raw material at the plasticizing temperature of 150-250 ℃ and the injection pressure of 15-80 MPa, and demolding to form a silicon rubber sheath and a silicon rubber shed, thus obtaining the composite insulator of the hard material layer reinforced core rod.
Further, the adhesive in step 3-1 includes, but is not limited to, silane-based adhesives, and the contact area between the hard material layer and the adhesive is increased by using a mechanical rotary polishing method, so that the bonding reactivity with the adhesive is improved. The wetting effect of the adhesive on the hard material layer is improved through preheating, and meanwhile, the preheating time and temperature are controlled to avoid the failure of the adhesive.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the composite insulator, the core rod of the reinforced composite insulator is wrapped by the hard material layer, the core rod is prevented from being directly exposed by the high-strength corrosion-resistant hard material layer, the running stability of the composite insulator is greatly improved, and meanwhile, the composite insulator of the core rod reinforced by the hard material layer has excellent anti-pollution flashover capability and bird pecking resistance by adopting the silicone rubber material sheath and the umbrella skirt with optimal hydrophobicity and hydrophobicity migration;
(2) the hard material layer adopts alicyclic epoxy resin, and has better dielectric property, weather resistance and ultraviolet radiation resistance compared with the traditional bisphenol A type epoxy resin; by adding polyolefin and other plastic raw materials, compared with the traditional epoxy resin formula, the proportion of inorganic filler in the mixed material is greatly reduced; by adding methyl hexahydrophthalic anhydride as a curing agent, the alicyclic epoxy resin is fully cured in an anhydride system, and meanwhile, an amine curing agent with high toxicity and high volatility can be avoided; the hard material of the invention ensures that the material mixing has the advantages of easy stirring, uniform material curing, short curing time and the like;
(3) the preparation method disclosed by the invention is simple in preparation process, greatly improves the compactness of the internal structure of the hard material layer, reduces the internal stress, improves the insulating property, the mechanical strength, the dimensional precision and the uniformity of a workpiece, is short in gel curing time, greatly improves the utilization rate of a die, shortens the production period, and is high in production efficiency, low in product cost and low in labor intensity.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (9)
1. A preparation method of a composite insulator of a hard material layer reinforced core rod comprises a silicon rubber umbrella skirt (1), a silicon rubber sheath (2), a core rod (3), a hardware fitting (5) and a hard material layer (4);
the core rod is positioned at the innermost part of the insulator; the hard material layer covers the outer surface of the mandrel; the silicone rubber sheath wraps the outer side of the hard material layer, and the silicone rubber umbrella skirt is arranged on the outer side of the silicone rubber sheath; the hardware is positioned at two ends of the composite insulator, and the core rod is positioned in a central hole of the hardware;
the hard material of the hard material layer comprises the following components in parts by weight: 100 parts of alicyclic epoxy resin, 30-50 parts of plastic, 20-40 parts of methyl hexahydrophthalic anhydride curing agent, 10-15 parts of aluminum trihydrate micropowder flame retardant, 1-2 parts of silanization coupling agent and 2-10 parts of fluoride auxiliary agent;
the preparation method is characterized by comprising the following steps:
step 1, inserting an insulating core rod into a central hole of a hardware fitting, and then forming an integral body by compression bonding or gluing to obtain an insulating core rod-hardware fitting composite body;
step 2, putting the insulating core rod-hardware fitting composite body obtained in the step 1 into a die, and forming a hard material layer on the outer surface of the core rod;
and 3, forming a silicone rubber sheath and a silicone rubber shed outside the insulating core rod-hardware fitting complex with the hard material layer to obtain the composite insulator of the hard material layer reinforced core rod.
2. The method according to claim 1, wherein the core rod is reinforced with a hard material layer,
the step 2 further comprises the step of,
step 2-1, weighing the raw materials of the hard material layer according to the following weight ratio: 100 parts of alicyclic epoxy resin, 30-50 parts of plastic, 20-40 parts of methyl hexahydrophthalic anhydride curing agent, 10-15 parts of aluminum trihydrate micropowder flame retardant, 1-2 parts of silanization coupling agent and 2-10 parts of fluoride auxiliary agent, and placing the materials into a vacuum stirring kettle for stirring and degassing, wherein the vacuum degree is less than 0.5kPa, the mixing temperature is 30-40 ℃, and the stirring and degassing time is 120min to obtain mixed gel;
step 2-2, keeping the temperature of the mold at 110-130 ℃, keeping the vacuum degree in the mold cavity at less than 0.1kPa, injecting the mixed gel into the mold cavity at a fixed pressure of 0.3-0.5 MPa, and keeping the pressure for injection for 30-45 min and curing for 30 min;
and 2-3, demolding, removing the flash and obtaining the insulating core rod-hardware fitting composite body with the hard material layer on the outer surface.
3. The method according to claim 2, wherein the core rod is reinforced with a hard material layer,
and (3) pretreating the raw materials of the hard material layer before mixing in the step 2-1 to remove moisture, gas and volatile substances in the raw materials.
4. The method according to claim 1, wherein the core rod is reinforced with a hard material layer,
the step 3 further comprises the step of,
step 3-1, polishing the surface of the hard material layer on the surface of the insulating core rod-hardware fitting composite body in the step 2, coating an adhesive, and putting the hard material layer into an oven for preheating, wherein the preheating temperature is 60-80 ℃, and the preheating time is 45-60 min;
and 3-2, putting the preheated insulation core rod-hardware fitting complex with the hard material layer in the step 3-1 into a mold, injecting and plasticizing a silicon rubber raw material at the plasticizing temperature of 150-250 ℃ and the injection pressure of 15-80 MPa, and demolding to form a silicon rubber sheath and a silicon rubber shed, thus obtaining the composite insulator of the hard material layer reinforced core rod.
5. The method for preparing the composite insulator of the hard material layer reinforced core rod according to claim 1, wherein the method comprises the following steps:
the plastic comprises one or more of polyethylene, polypropylene, polystyrene, polyamide and polycarbonate.
6. The method for preparing the composite insulator of the hard material layer reinforced core rod according to claim 2, wherein the method comprises the following steps:
the aluminum trihydrate micropowder comprises 70 weight percent of alumina and 30 weight percent of titanium dioxide.
7. The method for preparing the composite insulator of the hard material layer reinforced core rod according to claim 1, wherein the method comprises the following steps:
the core rod is made of glass fiber and epoxy resin.
8. The method for preparing the composite insulator of the hard material layer reinforced core rod according to claim 1, wherein the method comprises the following steps:
the silicone rubber sheath and the silicone rubber umbrella skirt are made of silicone rubber materials, and the silicone rubber sheath and the silicone rubber umbrella skirt are wrapped on the outer side of the hard material layer in a one-time injection molding mode.
9. The method for preparing the composite insulator of the hard material layer reinforced core rod according to claim 1, wherein the method comprises the following steps:
the silicon rubber umbrella skirt is of an equal-diameter umbrella skirt structure, a large umbrella skirt structure and a small umbrella skirt structure, or a large umbrella skirt structure and a medium umbrella skirt structure.
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