KR100737279B1 - Method for preparing glass-fiber insulating rod coated with epoxy and glass-fiber insulating rod using the method - Google Patents

Abstract

Provided is a method of preparing a glass-fiber insulating rod coated with an epoxy resin to suppress cavity formation as much as possible and to prevent corrosion of the glass-fiber insulating rod. The glass-fiber insulating rod is prepared by: coating a glass-fiber fabric with an epoxy resin to form a prepreg; laminating the prepreg in plural forms; heating twice, the first heating at 105-110deg.C for 60-90 minutes and the second heating at higher than 160deg.C for 3-4 hours, and pressing the plural, laminated prepregs under vacuum to form an epoxy coated glass-fiber board; cutting the glass-fiber board to form a glass-fiber insulating rod; and coating an exterior portion of the glass-fiber insulating rod with an anti-corrosion agent to form an insulating rod coated with the anti-corrosion agent.

Description

Method for preparing epoxy coated glass fiber insulating rod and epoxy coated glass fiber insulating rod using the above method

1 is a block diagram schematically showing a method of manufacturing an epoxy coated glass fiber insulating rod according to a first embodiment of the present invention;

2 (a) to 2 (e) are perspective views showing the shape of the intermediate product produced in the production of the epoxy coated glass fiber insulating rod according to the present invention;

3 shows the structure of a tower coater used for vertical-reverse impregnation according to a first embodiment of the invention;

4 is a diagram showing a configuration of a major chamber according to the first embodiment of the present invention; And

5 is a block diagram schematically illustrating a method of manufacturing an epoxy coated glass fiber insulating rod according to a second embodiment of the present invention.

The present invention is a method for producing an epoxy coated glass fiber insulating rod, more specifically, a method for manufacturing an epoxy coated glass fiber insulating rod, which is an insulation device used in high voltage electrical equipment using SF ₆ gas, etc. The invention relates to a coated glass fiber insulating rod.

The manufacturing method of the solid insulator of the conventional high voltage electric machine, especially the solid insulator used for the electric machine using SF ₆ gas is as follows. First, a thin thin glass fiber cloth is impregnated with an epoxy resin to form a semi-cured epoxy coated glass fiber fabric (hereinafter referred to as prepreg). Subsequently, a plurality of the above prepregs are laminated, and then heated and pressurized to form an epoxy coated glass fiber sheet. Subsequently, the epoxy coated glass fiber sheet is subjected to machining such as lathe, milling, cutting and polishing to form an epoxy coated glass fiber insulating rod.

However, in the conventional epoxy coated glass fiber insulating rod, a cavity is formed between the epoxy resin and the glass fiber by air adsorbed on the glass fiber surface in the process of impregnating the epoxy resin into the glass fiber and laminating and curing the epoxy resin. In addition, there is a little space between the prepregs in the process of laminating the prepregs, and the voids are formed by the spaces, and the space generated as the uncured epoxy resin flows out when the epoxy resin is cured is released after the rod completion Sometimes exists. Since the cavity generated by various causes concentrates the load of the rod, fatigue accumulates and causes cracking and fracture of the rod. In addition, the presence of such cavities in addition to these mechanical defects causes a serious impairment of the electrical insulation performance of the rod.

In addition, the conventional epoxy coated glass fiber insulating rod has the disadvantage that decomposition and corrosion by the arc discharge decomposition product of SF ₆ gas occurs. Specifically, in general high voltage electric equipment, SF ₆ gas is injected to increase insulation characteristics, and SF ₆ gas may be HF, SF ₄ , SOF ₄ , CPF _4, etc. due to the high voltage arc discharge generated during operation of the electric equipment. Decompose In addition, the epoxy coated glass fiber insulating rod is subjected to machining such as lathe, milling, cutting and polishing in the rod manufacturing process, in which the glass fiber coated with epoxy resin is exposed to the outside. On the other hand, even when the glass fiber is coated with an epoxy resin, the coating thickness of the epoxy resin is difficult to exceed 0.05mm, so that the epoxy resin coated on the surface of the glass fiber is destroyed during high-voltage arc discharge, and the glass fiber is exposed to the outside. However, the main component of the glass fiber is silica (SiO ₂ ), which reacts with hydrofluoric acid generated by arc discharge as follows to form SiF ₄ gas and water (H ₂ O) to corrode the silica of the glass fiber.

SiO ₂ + ₄ HF → SiF ₄ + 2H ₂ O

In addition, SOF ₄ produced by the arc discharge is reacted again with water produced by Chemical Formula 1 to produce SO ₂ F ₂ and HF (fluoric acid).

SOF ₄ + H ₂ O → SO ₂ F ₂ + 2HF

In addition, since the HF produced here reacts with silica again, the glass fiber is rapidly corroded as a result of high voltage arc discharge as a result of this chain reaction. As the glass fiber is corroded as described above, a cavity is generated inside the glass fiber, so that the mechanical strength is greatly weakened, and the electrical properties are also deteriorated.

As described above, the conventional epoxy coated glass fiber insulating rod is deteriorated in mechanical and electrical performance due to the formation of cavities and corrosion over time, and the breakdown and malfunction of the insulating device causes a large accident. In addition, in order to prepare for the risk of such a safety accident, the conventional electric equipment managers prevent safety accidents by regularly stopping the machine operation and replacing the epoxy coated glass fiber insulating rod, but this also consumes a lot of time and money. Not efficient at this point

The present invention is to solve the problems of the conventional epoxy coated glass fiber insulating rod, an object of the present invention is to provide a method for producing an epoxy coated glass fiber insulating rod that suppresses the formation of a cavity when manufacturing the epoxy coated glass fiber. It is done.

In another aspect, the present invention is to provide a method of manufacturing an epoxy coated glass fiber insulating rod that can prevent the corrosion of the glass fiber due to the chemical reaction of the hydrofluoric acid and silica by processing the outside of the epoxy coated glass fiber insulating rod so as not to react with hydrofluoric acid. The purpose.

It is another object of the present invention to provide an epoxy coated glass fiber insulating rod formed according to the above production method.

Method for producing an epoxy coated glass fiber insulating rod according to a first embodiment of the present invention for achieving the above object is to form a prepreg by applying a glass fiber fabric with epoxy resin (I); Stacking the plurality of prepregs (II); Heating and pressing the laminated plurality of prepregs in a vacuum to form an epoxy coated glass fiber sheet (III); And cutting the glass fiber sheet to form a glass fiber insulating rod (IV).

In addition, in the manufacturing method according to the first embodiment, the step (I) of applying a glass fiber fabric with an epoxy resin to form a prepreg is the step of passing the glass fiber fabric through the impregnation tank containing the epoxy resin and the It is preferable that the glass fiber fabric passed through the impregnation tank is squeezed (squeezing) while passing through a roller that rotates in a direction opposite to the traveling direction of the fabric while moving up in the vertical direction.

In addition, the step (III) of forming the epoxy coated glass fiber sheet by heating and pressurizing the plurality of stacked prepregs in a vacuum may be performed by installing the plurality of stacked prepregs in a vacuum chamber and at least one of the installed prepregs. It is preferable to include installing a hot plate capable of heating and pressurizing on one surface, connecting a vacuum apparatus and the vacuum chamber through a vacuum line guide, and heating and pressurizing the installed prepreg while maintaining a vacuum. . In this case, the vacuum line guide and the prepreg are preferably spaced apart by about 7 cm or more. In this case, it is preferable to further form an absorbent cloth for absorbing the epoxy resin between the vacuum line guide and the prepreg.

In addition, the heating in step (III) is preferably composed of a first heating step at 105 ℃ to 110 ℃ for 60 minutes to 90 minutes and a second heating for 3 hours to 4 hours at a temperature of 160 ℃ or more. In this case, the pressure provided to the prepreg is preferably 50kg / cm ² to 100kg / cm ² .

In addition, the method of manufacturing the epoxy coated glass fiber insulating rod according to the second embodiment of the present invention, in addition to the method of manufacturing the epoxy coated glass fiber insulating rod according to the first embodiment, a corrosion inhibitor is applied to the outside of the glass fiber insulating rod. Preferably, the method further comprises the step (V) of application.

In addition, the corrosion inhibitor in the step (V) is preferably applied to a thickness of 0.3mm or more on the outer surface of the glass fiber insulating rod.

In addition, the corrosion inhibitor in the step (V) preferably comprises an epoxy resin, MgF ₂ and Al ₂ O ₃ powder. In this case, the diameter of the Al ₂ O ₃ powder is preferably less than 100 nm, preferably about 10 nm.

In addition, the corrosion inhibitor preferably comprises an epoxy resin, MgF ₂ , Al ₂ O ₃ powder, 1-cyanoethyl-2-4-methylimidazole and 2-ethoxyethanol. In this case, the content of the epoxy resin, MgF ₂ and Al ₂ O ₃ and 1-cyanoethyl-2-4-methylimidazole and 2-ethoxyethanol is about 1: 1 to 1: 0.9 by mass ratio. desirable.

In addition, the application of the corrosion inhibitor is preferably configured to repeat three or more times the step of curing after spraying the corrosion inhibitor ten times. In addition, it is preferable to heat for 1 hour at 80 ℃, 4 hours at 140 ℃ for the curing.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

First, a method of manufacturing an epoxy coated glass fiber insulating rod according to a first embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

As shown in FIG. 1, the method of manufacturing the epoxy coated glass fiber insulating rod according to the first embodiment includes forming a prepreg by applying a glass fiber cloth with an epoxy resin; Stacking the plurality of prepregs (II); Heating and pressing the laminated plurality of prepregs in a vacuum to form an epoxy coated glass fiber sheet (III); And cutting the glass fiber sheet to form a glass fiber insulating rod (IV). In addition, the results generated by each of the steps I to IV described in FIG. 1 are shown in FIGS. 2 (a) to 2 (d).

In the first embodiment, the step (I) of applying the fiberglass fabric with an epoxy resin to form a prepreg is performed by using an epoxy resin using a container belt 58 or the like, for example, as shown in the tower coater shown in FIG. 3. It starts by passing the glass fiber cloth 50 of rectangular thin film form through the impregnation tank 54 containing 52. As shown to FIG. Subsequently, the glass fiber fabric 50 passing through the impregnation tank 54 is passed through the squeegee roller 56 which rotates in the reverse direction with respect to the moving direction of the fabric 50 while moving vertically upward. That is, conventionally, while forming the prepreg while moving the fabric passing through the impregnation tank horizontally and also provided the rotation direction of the roller in the same direction as the movement direction of the fabric, the method according to the present embodiment is the squeegee roller 56 Is rotated in a direction opposite to the moving direction of the fabric 50, so as to squeeze the epoxy resin 52 applied to the fabric 50. The prepreg 60 produced according to the above method can suppress the generation of bubbles as much as possible and distribute the epoxy resin as evenly as possible on the glass fiber. Fig. 2A is a perspective view showing the shape of the prepreg formed by step I above. As shown in Fig. 2 (a), the prepreg is composed of glass fibers 11 to 14 and epoxy resins 21 to 24 impregnated with the respective fabrics 11 to 14.

Subsequently, after cutting the prepreg 60 to a certain standard, a plurality of prepregs 60 are laminated (step II). In this embodiment, the prepreg 60 impregnated with the epoxy resin is cut, but the fabric may first be cut to a certain size, and then impregnated and laminated with the epoxy resin, or the cutting procedure may be omitted. The number of prepregs 60 to be laminated can be freely increased or decreased depending on the thickness of the glass fiber fabric 50 initially provided and the thickness of the insulating rod to be manufactured, but is usually about 50 sheets to obtain an insulating rod of 10 cm thickness. To 60 prepregs are laminated. Fig. 2 (b) is a perspective view showing the shape in which the prepregs are stacked in step II.

The laminated prepreg 60 is then heated and pressurized in vacuo to form an epoxy glass fiber sheet (step III). An example for heating and pressurizing the prepreg 60 in vacuum is shown in FIG. 4. As shown in FIG. 4, heating and pressurization according to the present embodiment are performed in a vacuum chamber. Inside the vacuum chamber, a hot plate 61 for transferring heat to the prepreg 60 is installed. The hot plate 61 is preferably installed at the top and bottom of the central portion where the prepreg 60 is installed at the same time. In addition, in order to uniformly transfer the heat generated from the hot plate 61 to the prepreg 60, an auxiliary hot plate 62 is provided on the hot plate 61 provided at the lower portion. In this embodiment, the auxiliary hot plate 62 is made of stainless steel. In addition, the vacuum sealing film 63 and the release film 64 are sequentially stacked on the auxiliary hot plate 62. The vacuum sealing film 63 is preferably installed slightly larger than the auxiliary hot plate 62. Subsequently, a plurality of prepregs 60 are laminated on the release film 64, and the release film 64, the vacuum sealing film 63, the auxiliary hot plate 62, and the hot plate 61 are sequentially stacked. On the other hand, the vacuum guide 65 is provided to have a predetermined interval on one side of the prepreg 60, and an absorbent 66 for absorbing the epoxy resin is provided between the vacuum guide 65 and the prepreg 60. . By installing the absorbent 66, the epoxy resin released from the prepreg 60 during the vacuum heating and pressing of the prepreg 60 can be absorbed to prevent the epoxy resin from blocking the vacuum guide 65 and deteriorating the vacuum performance. All. In addition, the gap between the laminated prepreg 60 and the vacuum guide 65 is finished with a sealing agent 67. In addition, a vacuum device (not shown) is installed at one side of the vacuum guide 65 in which the prepregs 60 are not stacked to maintain the inside of the vacuum chamber having the above configuration in a vacuum state.

On the other hand, in the present embodiment is a method of curing the epoxy resin to form an epoxy glass fiber plate as follows. First, the inside of the chamber is made into a vacuum of 0.1torr or less using the apparatus described above, and then the prepreg 60 is heated and pressurized. First, the heating method is a first-stage heating method in which the prepreg 60 is continuously heated to 160 ° C or more, which is the complete curing temperature of the epoxy, until the epoxy is completely cured, and firstly, a temperature lower than 160 ° C, which is the complete curing temperature. After heating, there is a two-stage heating method in which a second heating is performed at a temperature of 160 ° C. or higher, which is a complete curing temperature. In the one-step heating method, since the curing is performed immediately without time for degassing bubbles, cavities, etc. in the prepreg during the curing process, the two-step heating method is more preferable. When the two-stage heating method is adopted, the first heating is carried out at a temperature of 70 ° C. to 120 ° C. for 30 minutes to 90 minutes, most preferably at a temperature of 105 ° C. to 110 ° C. for 60 minutes to 90 minutes, and the second heating. The heating is heated to a temperature of 160 ° C. or higher until the epoxy resin is sufficiently cured (3 to 4 hours). In addition, while prepreg 60 is heated and pressurized at the same time, it is pressurized at a pressure of 20kg / cm ² to 120kg / cm ² , preferably 50kg / cm ² to 100kg / cm ² . Fig. 2 (c) is a diagram showing the shape of the glass fiber plate molded integrally by step III. As shown in FIG. 2 (c), the epoxy resin 20 was integrally formed by vacuum heating and pressing.

Next, the glass fiber sheet is cut to form a glass fiber insulating rod (step IV). That is, the glass fiber sheet is cut horizontally and vertically according to the size required by the electric machine, and then the cut surface is polished to form an insulating rod. In addition, if necessary, an insulating rod may be inserted into a predetermined portion of the insulating rod, such as inserting a metal tube into the hole, or rounding the corner portion (R) to prevent electricity from being concentrated at the corner portion. Various machining is possible according to the characteristics of electric appliances. Fig. 2 (d) is a perspective view showing the insulating rod formed by step IV.

Next, a method of manufacturing the glass fiber insulating rod according to the second embodiment of the present invention will be described below with reference to FIG. 5. As shown in Figure 5, the glass fiber insulating rod according to the second embodiment is a step of forming a prepreg by applying a glass fiber fabric with an epoxy resin (I); Stacking the plurality of prepregs (II); Heating and pressing the laminated plurality of prepregs in a vacuum to form an epoxy coated glass fiber sheet (III); Cutting the glass fiber sheet to form a glass fiber rod (IV); And (V) forming an insulating rod coated with a corrosion inhibitor on the outside of the glass fiber rod. In addition, in the manufacturing method according to the present embodiment, the steps I to IV are substantially the same as the steps I to IV of the first embodiment, and thus description thereof is omitted.

The manufacturing method according to the present embodiment further includes the step (V) of applying a corrosion inhibitor to the outside of the glass fiber rod after cutting and polishing the glass fiber plate to form a glass fiber rod. The corrosion inhibitor according to the present embodiment is a mixture of epoxy resin, MgF ₂ and Al ₂ O ₃ powder as a material for suppressing the reaction with hydrofluoric acid gas, a small amount of pigment may be added. In addition, the corrosion inhibitor according to the present embodiment is mixed with 1-cyanoethyl-2-4-methylimidazole and 2-ethoxyethanol in a ratio of 1: 1 to 1: 0.9 by mass relative to the mixture as a curing agent. It is preferable to use.

Here, alumina (Al ₂ O ₃ ) powder is added to apply a corrosion inhibitor to the outside of the glass fiber to a sufficient thickness, preferably 0.3 mm or more. That is, when the glass fiber rod is coated with an epoxy resin without other additives, it is difficult to form the thickness of the epoxy resin layer to 0.05 mm or more, and when a strong arc discharge occurs, the epoxy resin is destroyed and the glass fiber is corroded. To solve this problem, alumina is added. In addition, when the particle size of the alumina powder is large, precipitation easily occurs in the epoxy resin and is not easily applied to the glass fiber rod. Therefore, it is preferable to use a powder of several tens of nm size, preferably about 10 nm size. On the other hand, magnesium fluoride (MgF ₂ ) was added in order to solve the disadvantage that the viscosity of the epoxy resin is greatly changed even when the alumina powder having a size of 10 nm is used, even with a slight change in the alumina content. That is, magnesium fluoride (MgF ₂ ) is used to increase the compatibility of the alumina powder and the epoxy resin and to improve workability. The content of the epoxy resin, alumina, magnesium fluoride and the pigment is limited to the ratio of approximately 50: 25: 15: 10 in the mass ratio in this embodiment, but is not necessarily limited to the content.

The corrosion inhibitor having the above composition is applied to the surface of the glass fiber rod to have a thickness of 0.3 mm or more. As a method of applying the corrosion inhibitor to the surface of the glass fiber rod, this embodiment adopts a gravity type spray method, and the step of curing after 10 sprays was repeated three times. In addition, it is preferable to heat for 1 hour at 80 ℃, 4 hours at 140 ℃ for the curing. In addition, it is preferable to use the compressed air used for spraying from which water was removed through the air dryer. Figure 2 (e) is a perspective view showing the appearance of the corrosion inhibitor coating insulating rod formed by the above step V.

Various experimental results of the insulating rod manufactured according to the first and second embodiments of the present invention and the insulating rod manufactured according to the conventional method will be described below. In the table below, V-EGL is a glass fiber insulating rod formed according to the first embodiment, V-EGL + AE is a glass fiber insulating rod formed according to the second embodiment, and EGL is an insulating rod manufactured by a conventional method. it means. In addition, the insulating rod used in the following experiment was charged with 13,475 g of glass fiber cloth (55 square-shaped glass cloths of 1 m ² size) and 13,475 g of epoxy resin in step I. In addition, the size of the glass fiber sheet produced by the steps I to III is 1,000 × 1000 × 10mm, the weight is 19,080g. Further, in step III, a first heating was performed at 110 ° C. for 60 minutes with a vacuum of 0.1 torr, and second heating was performed at 160 ° C., and the pressure applied to the prepreg was 100 kg / cm ² . In addition, the content ratio of the corrosion inhibitor added in step V is a mixture of epoxy resin, MgF ₂ , Al ₂ O ₃ powder and pigment, and the curing agent 1-cyanoethyl-2-4-methylimidazole and 2-ethoxy The content ratio of ethanol is 1: 0.9, and the content of epoxy resin, alumina, magnesium fluoride, and pigment is about 50: 25: 15: 10 by mass ratio in this embodiment, and 1-cyanoethyl-2-4-methyl The content ratio of imidazole and 2-ethoxyethanol is 7: 3. The spraying of the corrosion inhibitor 10 times is preferably configured to repeat the step of curing three or more times. In addition, to cure the corrosion inhibitor was heated for 1 hour at 80 ℃, 4 hours at 140 ℃, respectively.

Table 1 shows the results of testing the strength of the glass fiber insulating rod and the conventional insulating rod formed according to the first embodiment. As shown in Table 1, both the impact strength and the compressive strength of the insulating rod according to the first embodiment are significantly improved compared to the conventional insulating rod.

Impact Strength (J / cm) Compressive strength (N / mm ² ) Perpendicular to the floor Parallel to floor Perpendicular to the floor Parallel to floor V-EGL 22.6 10.9 565 333 EGL 10.3 3.2 436 216

Table 2 compares the mechanical and electrical properties of glass fiber insulating rods and conventional insulating rods formed according to the first and second embodiments. Meanwhile, in Table 2, the mechanical performances of the insulating rods according to the first and second embodiments are similar, and the insulating rods according to the second embodiment have arc resistance and the insulating rods according to the second embodiment have arc resistance. And experiments on arc and decay resistance were performed to increase the decay resistance to SF ₆ gas.

division Test Items unit V-EGL EGL V-EGL + AE  Physical properties importance Water absorption - 1.908 1.789- Water absorption % 0.0029 0.0100 - Resin Content Wt% 30.9 49.1 -     Mechanical performance The tensile strength N / mm ² 320 244 - Impact Strength (Vertical) J / cm 22.6 10.3 - Impact strength (parallel) J / cm 10.9 3.2 - Compressive strength (vertical) N / mm ² 565 436 - Compressive strength (parallel) N / mm ² 333 216 - Bending Strength (Vertical) N / mm ² 464 351 - Bending strength (parallel) N / mm ² 483 457 -   Electrical performance Breakdown Voltage (Vertical) kV / mm 25.02 24.99 - Breakdown voltage (parallel) kV / mm 16.60 16.95 - Volume specific resistance MΩ.cm 2.97 × 10 ⁸ 4.0 × 10 ⁴ - Arc resistance sec 182 171 181 Chemical properties SF ₆ gas decomposition resistance Wt% -2.1 -0.9 0.004

As shown in Table 2, the insulating rod according to the first embodiment of the present invention was found to be superior to all conventional mechanical rods such as tensile strength, impact strength, compressive strength and bending strength. In addition, the electrical characteristics such as volume resistivity were also shown to be superior. In addition, the insulating rod according to the second embodiment showed a significantly improved result than the conventional insulating rods in arc resistance and decomposition resistance to SF ₆ gas.

Table 3 shows the results of comparing the performance of the insulating rod according to the second embodiment with the standard performance required for a conventional insulating material for high voltage electrical equipment. As shown in the table below, the insulating rod according to the preferred embodiment of the present invention showed that the performance of the insulation material for the conventional high voltage electrical equipment is much higher than the performance standard required by all items.

division Test Items unit Performance requirements Performance results Assessment Methods     Material  1. Specific gravity - 1.90 ± 0.15 1.908 KS M 3015  2. Tensile Strength kgf / mm ² 30 or more 32.65 KS M 3015  3. Bending Strength kgf / mm ² 45 or more 47.34 KS M 3015  4. Impact strength J / cm 2.94 or more 22.6 KS M 3015  5. Compressive strength kgf / mm ² 45 or more 57.65 KS M 3015  6. Absorption rate % 0.15 or less 0.029 KS M 3015  7. Volume specific resistance ohm.cm 1 × 10 ¹² 2.97 × 10 ¹⁴ KS M 3015  8. Withstand voltage kV / mm 15 or more 25 KS M 3015  9. Arc resistance sec More than 110 181 KS M 2105  10. Resin Content % 32 ± 3.0 30.9 KS M 3015  11. Heat test - 180 ℃ 2 hours clear HHI  12. SF6 gas decomposition resistance % 0.5 or less 0.004 Self specification        product  13. Withstand voltage kV 450 kV for 1 minute clear HHI  14. Impact strength of product kV 1mp (1.2 / 50us) ± 1175kV 3 times clear HHI  15. Product Arc sec 120 seconds or more 181 HHI  16. Partial discharge kV - clear HHI  17. Measurement of product tan δ Power factor - clear HHI  18. Cold test - -35 degrees Celsius-105 degrees Celsius ten times clear HHI  19.BUSH withstand load kg 1,000kgf or more clear HHI  20. Tensile Withstand ton 9ton 30 seconds clear HHI  21. Compression withstand kgf / mm ² 45 or more 57.65 HHI  22. Flexural load resistance kgf / mm ² 45 or more 47.34 HHI  23.PT Test - The presence of cracks clear HHI  24. Tensile Strength at Break ton More than 19ton clear HHI

The method for producing an epoxy coated glass fiber according to the present invention has been described in detail with reference to Examples. However, one of ordinary skill in the art to which the present invention pertains can easily make various changes and modifications without departing from the spirit of the present invention. Therefore, the protection scope of the present invention is limited only by the claims described below.

The epoxy coated glass fiber insulating rod according to the present invention greatly improves the mechanical and electrical performance of the insulating rod by maximally suppressing the cavity generated inside the rod.

In addition, the epoxy coated glass fiber insulating rod according to the present invention can prevent the corrosion of the glass fiber due to the chemical reaction of the hydrofluoric acid and silica by coating the outside of the epoxy coated glass fiber insulating rod with a corrosion inhibitor so as not to react with the hydrofluoric acid.

Claims (14)

Applying a glass fiber cloth with an epoxy resin to form a prepreg (I); Stacking the plurality of prepregs (II); Heating and pressing the laminated plurality of prepregs in a vacuum to form an epoxy coated glass fiber sheet (III); Cutting the glass fiber sheet to form a glass fiber insulating rod (IV); And The method of manufacturing an epoxy coated glass fiber insulating rod, comprising the step (V) of applying a corrosion inhibitor to the outside of the glass fiber insulating rod to form a corrosion inhibitor coating insulating rod. The method of claim 1, wherein the step of forming the prepreg by applying the glass fiber fabric with an epoxy resin (I) is the step of passing the glass fiber fabric through the impregnation tank containing the epoxy resin and passing through the impregnation tank Epoxy-coated glass fiber insulating rod, characterized in that for squeezing the epoxy resin while moving the glass fiber fabric in a vertical direction while passing through a roller that rotates in a direction opposite to the traveling direction of the fabric. Manufacturing method. The method of claim 1, wherein the step (III) of heating and pressurizing the laminated plurality of prepregs in a vacuum to form an epoxy coated glass fiber plate comprises installing the laminated plurality of prepregs in a vacuum chamber, and Installing a hot plate capable of heating and pressurizing at least one surface of the prepreg, connecting a vacuum apparatus and the vacuum chamber through a vacuum line guide, and heating and pressurizing the installed prepreg while maintaining a vacuum Method for producing an epoxy coated glass fiber insulating rod, characterized in that. The method of claim 3, wherein the vacuum line guide and the prepreg are separated by 7 cm or more, and an absorbent fabric is further formed between the vacuum line guide and the prepreg. The method of claim 3, wherein the heating in step (III) comprises the first heating at 105 ℃ to 110 ℃ for 60 minutes to 90 minutes and the second heating for 3 to 4 hours at a temperature of 160 ℃ or more Method for producing an epoxy coated glass fiber insulating rod, characterized in that. The method of claim 5, wherein the pressure provided to the prepreg during heating is 50kg / cm ² to 100kg / cm ² . delete 7. The method of claim 1, wherein the corrosion inhibitor comprises epoxy resin, MgF ₂ and Al ₂ O ₃ powders. 10. The method of claim 8, wherein the Al ₂ O ₃ powder has a diameter of 10 nm or less. The anticorrosive agent according to any one of claims 1 to 6, wherein the preservative is epoxy resin, MgF ₂ , Al ₂ O ₃ powder, pigment, 1-cyanoethyl-2-4-methylimidazole and 2- Method for producing an epoxy coated glass fiber insulating rod comprising a oxyethanol. The method of claim 10, wherein the content of the epoxy resin, MgF ₂ and Al ₂ O ₃ and 1-cyanoethyl-2-4-methylimidazole and 2-ethoxyethanol are 1: 1 to 1: 0.9 by mass ratio. The content of epoxy resin, alumina, magnesium fluoride and pigment is 50: 25: 15: 10 by mass ratio, and the content ratio of 1-cyanoethyl-2-4-methylimidazole and 2-ethoxyethanol is 7 Method for producing an epoxy coated glass fiber insulating rod, characterized in that: 3. The method according to any one of claims 1 to 6, wherein the application of the preservative is configured to repeat the step of curing at least three times after spraying the preservative ten times, wherein the curing is performed at 80 ° C. for one hour, Method for producing an epoxy coated glass fiber insulating rod, characterized in that performed by heating at 140 ℃ for 4 hours each. The epoxy coating glass fiber insulating rod according to any one of claims 1 to 6, wherein in the step (V), the corrosion inhibitor is applied to the outer surface of the glass fiber insulating rod to a thickness of 0.3 mm or more. Manufacturing method. An epoxy coated glass fiber insulating rod made according to the method of any one of claims 1 to 6.

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