KR101397595B1 - Incombustible bushing for transformer and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a nonflammable insulator for power distribution and a manufacturing method thereof, capable of enhancing safety against a fire by forming the insulator, for fixating overhead wire at a power transmission tower or an electric pole, with fiber reinforcing plastic (FRP). The nonflammable insulator for power distribution according to the present invention comprises: an inside core having a cylindrical shape and being made up of an insulating synthetic resin material; a core body formed with a nonflammable core cover formed by impregnating fireproof fiber with a resin solution manufactured by mixing methylol-melamine resin with inorganic flame retarding materials, inputting and dispersing a solvent, and then diluting the mixture with water, and immediately adhered on an outside surface of the inner core in a semi-dried prepreg state by being heated and pressed with a set temperature and pressure; and a housing made up of a nonflammable synthetic resin, forming a hollow part which the core body is inserted into and is coupled with, and extending a plurality of skirts outwards from an outside surface.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an incombustible insulator,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power distributing insulator, and more particularly, to an insulator for fixing an overhead wire to a power transmission tower or a pole by using an incombustible fiber reinforced plastic (FRP) And to a method of manufacturing the incombustible insulator.

Generally, in order to fix a power transmission wire (power transmission wire) to a transmission tower or a pole, it is common to use an insulator made of an insulator to insulate and mechanically maintain or support the electric power. The insulator has a plurality of skirts to increase the distance along the surface in order to have sufficient electric insulating strength. This is effective in preventing the degradation of the dielectric strength when the surface is damp, especially when salt or dust adheres.

In general, porcelain is used as the main material of an insulator, and it has an excellent dielectric strength and is able to have a mechanical strength which is resistant to temperature change and sunlight environment without deterioration.

In addition to rigid magnetic materials, the core of fiberglass reinforced plastics (FRP) is coated with an ethylene propylene diene terpolymer (EPDM) or a silicon arrival skirt housing and an epoxy resin material wire arrival head ), And a polymer line post insulator disclosed in Korean Patent Registration No. 10-0516992 is an example of such a post line insulator.

Such a polymer insulator is continuously used in foreign countries due to economical efficiency, ease of installation and light weight, and accordingly, the use of polymer insulator for transmission is being considered in Korea. However, due to the characteristics of domestic terrain, mountainous area occupies more than 70% There is a problem that the polymer insulator is burnt and damaged due to a fire when a fire occurs.

Korean Registered Patent No. 10-0516992 (Registered Date: September 16, 2005): Polymer line post insulator

An object of the present invention is to provide a flame retardant raw resin which is obtained by diluting a water-soluble resin together with a flame retardant and an additive in water to prepare a flame retardant raw resin, And a method of manufacturing the incombustible insulator, which can minimize the damage caused by the fire due to the inconvenience or the delay of the combustion when a fire occurs.

According to an aspect of the present invention, there is provided an incombustible insulator for power distribution, comprising: an inner core made of an insulating synthetic resin material, a methylol melamine resin and an inorganic flame retardant, mixed and dispersed with a solvent, And a flame-retardant core cover which is directly bonded to the outer surface of the inner core by heating at a set temperature and a pressure in the form of a semi-dried prepreg formed by impregnating the resin aqueous solution with the flame-retardant fiber; And a housing formed of a non-combustible synthetic resin and having a hollow portion into which the core body is inserted and coupled, and a plurality of skirts formed on the outer surface thereof to extend outwardly.

According to one aspect of the present invention, there is provided a method for producing a resin composition, comprising the steps of: (a) mixing a methylol melamine resin and an inorganic flame retardant; (b) impregnating the resin aqueous solution with the flame-retardant fiber and molding the flame-retardant fiber into a rectangular plate shape through a molding process to produce a semi-finished product of the incombustible core cover; (c) connecting the semi-dry non-flammable core cover to the outer surface of the inner core fixed to the mold; (d) adhering the nonflammable core cover semi-finished product to the inner core by heating and pressing the outer surface of the nonflammable core cover semi-finished product at a predetermined temperature and pressure using a press mold; (e) inserting and inserting the core body into the hollow portion of the housing, thereby manufacturing a discharge incombustible insulator for power distribution.

The non-flammable insulator of the present invention is a non-flammable insulator having an excellent nonflammability on the outer surface of the inner core, which is directly bonded without using an adhesive to enhance the strength of the inner core and provide excellent nonflammability, Because it is made of materials, it can perform its original function without burning in fire.

Further, when the housing surrounding the core body is made of the same material as the nonflammable core cover, more excellent nonflammability can be obtained.

1 is a cross-sectional view of a non-combustible insulator according to an embodiment of the present invention.
Figure 2 is an exploded perspective view of the incombustible insulator lid of Figure 1;
Fig. 3 is an enlarged cross-sectional view of the main part of the incombustible insulator of Fig. 1; Fig.
4 is a flowchart sequentially showing a method of manufacturing the incombustible insulator of the present invention.
5 is a cross-sectional view of a main portion of a non-combustible insulator according to another embodiment of the present invention.
6 is a cross-sectional view of a main portion of a non-combustible insulator according to another embodiment of the present invention.
7 is a cross-sectional view of a main portion of a non-combustible insulator according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a non-incommunicable incombustible insulator according to the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 illustrate a non-incombustible insulator for power distribution according to an embodiment of the present invention. In the non-incombustible insulator of this embodiment, a threaded portion 115 to which a bolt 116 for engaging with an electric wire or the like is fastened is formed at a lower end thereof And a non-combustible core cover (120) which is thermally bonded to the outer surface of the inner core (110) at a predetermined temperature and pressure and is immediately bonded to the core body (100); And a housing 130 made of incombustible synthetic resin and having a hollow portion into which the core body 100 is inserted and coupled.

The inner core 110 of the core body 100 may be made of a known synthetic resin having insulation and flame retardancy but may be made of the same fiber reinforced plastic material as the nonflammable core cover 120. The inner core 110 has a plurality of grooves 111 arranged in a lattice structure on its outer surface. The recess 111 may be formed by inserting the non-incombustible core cover 120 by heating the outer core of the inner core 110 so as not to apply pressure to the inner surface of the recess 111, 120 in order to minimize the destruction of the microcapsules 122 contained in the microcapsules 122.

The nonflammable core cover 120 enhances the strength of the inner core 110 and provides fire resistance that does not burn even during a fire. The incombustible core cover 120 is formed by mixing a methylol melamine resin and an inorganic flame retardant, dispersing the mixture with a solvent, diluting it with water, impregnating the flame retardant fiber 121, pressed and pressed on one or both surfaces of the inner core 110 at a predetermined temperature and pressure in a prepreg state. Since the non-flammable core cover 120 includes a melamine resin, when the outer core of the inner core 110 is heated and pressed at a predetermined temperature and pressure in the prepreg state, the melamine resin component acts as an adhesive, Respectively.

The non-flammable core cover 120 is formed by mixing 20 to 30% by weight of methylol melamine resin with respect to the total weight of the resin aqueous solution and 10 to 25% by weight of the inorganic flame retardant based on the total weight of the resin aqueous solution, % By weight of a solvent and dispersing it in water of 50 to 60% by weight based on the total weight of the aqueous resin solution. If the content of the methylol melamine resin, the inorganic flame retardant, the solvent and the water in the aqueous resin solution is out of the above range, the physical properties of the incombustible core cover 120 as the final product, such as specific gravity, , The flexural strength, the flexural modulus, and the abrasion resistance are lowered, so that it is preferable to keep the above content range.

The inorganic flame retardant mixed in the methylol melamine resin is at least two selected from the group consisting of aluminum hydroxide, magnesium hydroxide, zinc borate, triammonium phosphate and antimony trioxide. The amount of the inorganic flame retardant is 30 to 50 By weight. The methylol melamine resin has an advantage of improving bonding strength with the flame retardant fiber. In addition, when two or more kinds of the above inorganic flame retardant materials are used in the above-mentioned weight% range, it is easy to dissolve in water, and it is easy to mix and dilute with a resin in an aqueous solution state and the flame retardant can be dispersed And does not emit volatile organic pollutants (VOCs) after molding of the resin.

Meanwhile, the non-flammable core cover 120 contains a plurality of microcapsules 122 to further improve the incombustibility and the bonding strength with the inner core 110. The microcapsules 122 may be mixed with a mixture of the methylol melamine resin and the inorganic flame retardant in the course of impregnating the mixture of the methylol melamine resin and the inorganic flame retardant into the flame retardant fiber 121. The microcapsule 122 has a structure in which a phase change material or a digestive liquid absorbing heat is absorbed in the outer skin layer of the synthetic resin material. When the fire occurs, the outer skin layer is broken by the heat at a high temperature, do.

If the outer cover layer of the microcapsule 122 contains melamine resin, when the non-flammable core cover 120 is pressed onto the inner core 110, the outer cover layer may contain melamine resin. It is possible to obtain an effect that the bonding force between the incombustible core cover 120 and the inner core 110 is further improved by the melamine resin while being broken.

The material contained in the outer layer of the microcapsule 122 is a phase change material containing paraffinic hydrocarbon or dimethylpropanediol (DMP) or hydroxymethyl-methyl-propanediol (HMP) To act as a fire-retardant effect, or to extinguish the liquid as a digestive juice.

The microcapsules 122 may be broken by the pressure when the incombustible core cover 120 is squeezed to the inner core 110. The microcapsules 122 are formed on the inside of the incombustible core cover 120, Are less likely to break, so that a maximum number of microcapsules 122 can be left after the non-flammable core cover 120 is bonded to the inner core 110.

Since a plurality of grooves 111 are formed in the outer surface of the inner core 110 in a lattice structure when the incombustible core cover 120 is pressed to the inner core 110, The possibility of breakage of the microcapsule 122 is minimized and the nonflammable core cover 120 is firmly adhered to the inner core 110 only at the outer portion of the groove 111 in which the pressure is normally received.

The housing 130 surrounds the outer periphery of the core body 100 and protects the core body 100. A plurality of disc-shaped skirts 132 are formed on the outer surface of the housing 130 so as to extend outward to form a corrugated shape. The housing 130 may be made of a known non-combustible resin material, but more preferably, made of the same fiber-reinforced plastic material as that of the incombustible core cover 120. The core body 100 can be firmly adhered to the inner circumferential surface of the hollow portion of the housing 130 by an adhesive. In the upper end of the core body (100) and the housing (130), a conductive seating groove (131) on which a conductive wire is seated is concave.

The non-combustible insulator as described above can be manufactured using a sheet molding compound (SMC) method. That is, the non-flammable core cover 120 and the inner core 110 in the prepreg state are connected to a mold of a SMC (Sheet Molding Compound) equipment, and the press mold is moved to set the incombustible core cover 120 When the inner core 110 is pressed against the inner core 110, the non-flammable core cover 120 is bonded to the inner core 110. At this time, the nonflammable core cover 120 is bonded to the outer partial surface of the groove 111 of the inner core 110.

4, a methylol melamine resin and an inorganic flame retardant are mixed, a solvent is added and dispersed, and the mixture is diluted with water to prepare an aqueous resin solution (step S1) , And the resin aqueous solution is impregnated with the flame retardant fiber (step S2).

The flame-retardant fiber impregnated with the resin aqueous solution is put into a drying apparatus and heated to remove moisture contained in the resin aqueous solution (step S3). If the drying process is not performed, a large amount of water is present in the resin aqueous solution of the flame retardant fiber, so that there is a possibility that sufficient incombustibility can not be obtained even if the subsequent incombustible core cover 120 molding process is performed.

Subsequently, the semi-finished product of the incombustible core cover 120 in the form of a prepreg is formed into a flat flat plate by applying a predetermined heat to the dried flame-retardant fiber through a drying process (step S4).

When the semi-finished product of the incombustible core cover 120 is completed as described above, the semi-dry incombustible core cover 120 is connected to the outer surface of the inner core 110 placed on the mold (step S5). In this state, the press die presses and bonds the incombustible core cover 120 to the inner core 110 at the set temperature and pressure. At this time, the methylol melamine component contained in the incombustible core cover 120 is melted and the incombustible core cover 120 is firmly adhered to the surface of the inner core 110 (step S6).

After the core body 100 is formed by bonding the non-combustible core cover 120 to the outer surface of the inner core 110 as described above, an adhesive is applied to the outer surface of the core body 100 and the inner surface of the hollow portion of the housing 130 (Step S7), the assembly of the non-combustible insulator is completed.

5, in order to improve the bonding strength between the non-flammable core cover 120 and the inner core 110 and to further improve the strength of the non-flammable core, the inner core 110 and the non- A net structure 150 of a net structure may be interposed.

The mesh 150 is made of a flame-retardant fiber material and joined together with the inner core 110 by the methylol melamine resin of the incombustible core cover 120 to increase the overall strength of the incombustible insulator, The microcapsules 122 are protected by the mesh 150 so that a larger number of the microcapsules 122 can remain when the microcapsules 120 are attached to the inner core 110.

The inner core 110 may be etched or sandblasted to roughen the surface of the inner core 110 to bond the non-incombustible core cover 120 to the non-combustible core cover 120, The bonding force between the core cover 120 and the inner core 110 may be increased. As described above, when the inner core 110 is surface-roughened, the methylol melamine resin penetrates into the very fine irregularities formed on the surface, thereby further increasing the bonding force.

7, a flexible cushioning material 140 made of a flame-retardant material is housed inside the groove 111 of the inner core 110, and the cushioning material 140 is also provided with a non-combustible core cover 120 And a microcapsule 141 made of the same component as that contained therein.

The cushioning member 140 accommodated in the recess 111 functions not only as a shock absorbing material for absorbing impact but also as a receptacle for accommodating the microcapsules 122. When the microcapsules 122 are contained in the cushioning material 140, heat energy is absorbed or released by the microcapsules 122 inside the cushioning material 140 in case of fire, so that a better fire-retarding or extinguishing effect can be obtained.

The cushion material 140 may be made by foaming a flame-retardant resin, but may simply be a flock of flame-retardant fibers.

As described above, the non-flammable insulator of the present invention has a structure in which the non-flammable core cover 120 is directly bonded to the outer surface of the inner core 110 without using an adhesive, thereby enhancing the strength of the inner core 110 and providing excellent non- do. Further, when the housing 130 surrounding the core body 100 is made of the same material as the above-mentioned incombustible core cover 120, more excellent nonflammability can be obtained.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined by the appended claims. And it is to be understood that such modified embodiments belong to the scope of protection of the present invention defined by the appended claims.

100: core body 110: inner core
111: groove 115: threaded portion
120: nonflammable core cover 121: flame retardant fiber
122: microcapsule 130: housing
131: lead seating groove 132: skirt
140: cushion material 141: microcapsule
150:

Claims (11)

An inner core 110 made of an insulative synthetic resin material made of a cylindrical material, a core 110 made of a methylol melamine resin and an inorganic flame retardant, mixed with a solvent, dispersed in water, diluted with water, A core body (100) composed of a non-combustible core cover (120) which is thermally bonded to the outer surface of the inner core (110) at a predetermined temperature and pressure and bonded directly thereto in a prepreg state;
And a housing (130) made of a non-combustible synthetic resin and having a hollow portion into which the core body (100) is inserted and coupled, and a plurality of skirts (132) extending outwardly from the outer surface;
A plurality of recesses 111 are arranged on the outer surface of the inner core 110 and the microcapsules 122 containing phase change material or digestive fluid absorbing heat in the outer skin layer of the synthetic resin material are arranged on the non- Characterized in that the incombustible insulator for ships is included. delete The incombustible insulator according to claim 1, wherein a flexible cushioning material (140) made of a flame retardant material is accommodated in a groove (111) of the inner core (110). 4. The incombustible incandescent lamp of claim 3, wherein the cushioning member (140) includes a microcapsule (141) made of the same component as that contained in the incombustible core cover (120). The incombustible insulator according to claim 1, wherein a net structure (150) of a net structure is interposed between the inner core (110) and the incombustible core cover (120). The method of claim 1, wherein the microcapsules (122)
An outer skin layer containing a melamine resin;
A core material containing a paraffinic hydrocarbon or dimethylpropanediol (DMP), hydroxymethyl-methyl-propanediol (HMP). The non-combustible core cover (120) according to claim 1, characterized in that the surface of the inner core (110) is subjected to etching or sand blast to bond the incombustible core cover (120) Insane. The incombustible insulator according to claim 1, wherein the inner core (110) is made of the same material as the incombustible core cover (120) and has incombustibility. The incombustible insulator according to claim 1, wherein the housing (130) is made of the same material as the incombustible core cover (120). (a) mixing a methylol melamine resin and an inorganic flame retardant, adding a solvent to disperse the mixture, and then diluting the mixture to prepare an aqueous resin solution;
(b) impregnating the resin aqueous solution with the flame-retardant fiber, and molding the flame-retardant fiber into a rectangular plate shape through a molding process to produce a semi-finished product of the incombustible core cover 120;
(c) connecting the semi-dry incombustible core cover 120 to the outer surface of the inner core 110 fixed to the mold;
(d) forming the core body 100 by bonding the semi-finished product of the incombustible core cover 120 to the inner core 110 by heating and pressing the outer surface of the nonflammable core cover 120 at a predetermined temperature and pressure using a press mold; Wow;
(e) inserting the core body (100) into the hollow part of the housing (130) and engaging the core body (100). A method of manufacturing an incombustible insulator. The method according to claim 10, wherein the step (b) is performed by performing a drying step of heating the flame-retarded fiber impregnated with the resin aqueous solution in a drying apparatus to remove moisture contained in the resin aqueous solution, (EN) METHOD FOR MANUFACTURING Dedicated Non -

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