A fiber modification method for insulating pull rod based on dielectric barrier discharge

Abstract

The present invention relates to a method for modifying fibers for insulating rods based on dielectric barrier discharge, and the technical characteristics thereof are: cleaning and drying the fibers for insulating rods; placing the fibers for insulating rods after cleaning and drying in a dielectric barrier discharge plasma device for modification; winding the modified fibers for insulating rods on a tubular mold, and then vacuum pressure impregnating the fibers with epoxy resin, and finally placing the fibers in a curing furnace for high-temperature curing to produce fiber-modified insulating rods. The present invention uses argon dielectric barrier discharge plasma under atmospheric pressure to modify the fibers for insulating rods, thereby improving the interface bonding ability of the insulating rods, reducing minor defects caused by poor bonding between the fibers and the resin, improving the electrical insulation and mechanical properties of the insulating rods, and meeting the needs of large-scale continuous industrial production.

Description

Technical Field

[0001] The invention belongs to the field of high voltage electrical technology, in particular to a fiber modification method for an insulating pull rod based on dielectric barrier discharge. Background Art

[0002] The insulating rod is a key component in the UHV GIS circuit breaker, which can transmit the movement from the grounded part to the high potential part to achieve the on-off of the electrical connection. However, the insulating rod will be subjected to a certain tensile or compressive load and instantaneous operating impulse voltage during operation. Frequent operation puts high demands on its insulation performance, mechanical properties and other properties.

[0003] The reinforcing materials of insulating rods are usually glass fiber or aramid fiber. Since glass fiber and aramid fiber have smooth surfaces and are chemically inert, their interfacial bonding performance with epoxy resin is limited, which will cause defects such as dry spots and air gaps inside the insulating rods. When the insulating rods are put into operation, the internal defects are prone to cause partial discharge or even breakdown under the action of strong electric fields. Therefore, how to improve the interfacial compatibility between the fiber and epoxy resin of the insulating rods, as well as the electrical insulation and mechanical properties, is an urgent problem that needs to be solved. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a fiber modification method for an insulating rod based on dielectric barrier discharge, which is used to improve the interface bonding ability of the insulating rod, thereby improving its electrical insulation and mechanical properties.

[0005] The present invention solves the existing technical problems by adopting the following technical solutions:

[0006] A fiber modification method for an insulating pull rod based on dielectric barrier discharge comprises the following steps:

[0007] Step 1, cleaning and drying the fiber for insulating pull rod;

[0008] Step 2, placing the cleaned and dried insulating pull rod fiber in a dielectric barrier discharge plasma device for modification;

[0009] Step 3, winding the modified insulating rod with fibers on a tubular mold, then vacuum pressure impregnating it with epoxy resin, and finally placing it in a curing furnace for high-temperature curing to produce a fiber-modified insulating rod;

[0010] The fiber used for the insulating pull rod is glass fiber or aramid fiber;

[0011] The dielectric barrier discharge plasma device adopts an argon dielectric barrier discharge plasma device under atmospheric pressure, comprising a high-voltage discharge electrode, a grounding electrode, a quartz glass reactor, a metal bracket and a metal base, wherein the high-voltage discharge electrode is mounted on the metal bracket, the bottom of the high-voltage discharge electrode is a plurality of groups of parallel external electrode structures, the grounding electrode is mounted on the metal base, the quartz glass reactor is mounted between the high-voltage discharge electrode and the grounding electrode and in contact with each other, and a gas inlet and a gas outlet are respectively arranged at both ends of the quartz glass reactor;

[0012] The dielectric barrier discharge plasma device treatment method in step 2 is: under an argon atmosphere, the output power is 200-500 W, the argon flow rate is 1-5 L / min, and the treatment time is 1-3 min.

[0013] Furthermore, the specific implementation method of step 1 is: heat and clean the insulating pull rod fiber in a 100°C deionized water bath for 2-4 hours, then clean it with ultrasound for 1-2 hours, and finally dry it in a 60-80°C oven for 3-8 hours.

[0014] Furthermore, the insulating pull rod is a cylindrical core rod.

[0015] Furthermore, the conditions for high temperature curing treatment in step 3 are: firstly maintaining the temperature at 80-120°C for 2-4 hours, and then maintaining the temperature at 120-140°C for 3-5 hours.

[0016] The advantages and positive effects of the present invention are:

[0017] The invention is reasonably designed, and uses argon dielectric barrier discharge plasma under atmospheric pressure to modify the fiber for the insulating rod. The surface of the modified fiber becomes rough and triggers the groups in the matrix polymer structure to generate free radicals, and generates small molecular active groups on the polymer surface, thereby improving the interface bonding ability of the insulating rod, reducing tiny defects caused by poor bonding between the fiber and the resin, and improving the electrical insulation and mechanical properties of the insulating rod; and the fiber can be continuously modified, impregnated and cured, which meets the needs of large-scale continuous industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of fiber modification and insulating pull rod manufacturing of the present invention;

[0019] Figure 2 is a schematic diagram of a dielectric barrier discharge plasma device of the present invention;

[0020] Figure 3 It is a schematic diagram of the distribution of multiple groups of high-voltage discharge electrodes of the present invention;

[0021] Figure 4is the static contact angle of the fiber before and after the plasma treatment of the present invention;

[0022] Figure 5 It is the SEM picture before and after the plasma treatment of the present invention;

[0023] In the figure, 1-high voltage discharge electrode, 2-ground electrode, 3-quartz glass reactor, 4-gas inlet, 5-gas outlet, 6-metal bracket, 7-metal base. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0025] The present invention adopts plasma modification technology and dielectric barrier discharge technology to achieve the modification function of the fiber for insulating pull rod, wherein plasma modification is a commonly used method in physical modification, which has the advantages of high efficiency, low energy consumption, green environmental protection, etc., and the treatment only acts on the fiber surface without affecting the fiber strength. Dielectric barrier discharge technology can be used under atmospheric pressure without vacuum device, and ensures the possibility of large-scale industrialization.

[0026] Based on the above description, the present invention proposes a fiber modification method for insulating pull rods based on dielectric barrier discharge, such as Figure 1 As shown, the following steps are included:

[0027] Step 1: Clean and dry the fiber for the insulating pull rod.

[0028] In the present invention, the fiber used for the insulating pull rod is glass fiber or aramid fiber.

[0029] In this step, the fiber to be treated is first heated and cleaned in a 100°C deionized water bath for 2 to 4 h, then ultrasonically cleaned for 1 to 2 h, and finally dried in a 60 to 80°C oven for 3 to 8 h.

[0030] Step 2: placing the cleaned and dried insulating pull rod fibers in a dielectric barrier discharge plasma device for modification.

[0031] The dielectric barrier discharge plasma device used in the present invention is as follows Figure 2 and Figure 3 As shown, it includes a high-voltage discharge electrode 1, a grounding electrode 2, a quartz glass reactor 3, a metal bracket 6 and a metal base 7. The high-voltage discharge electrode 1 is installed on the metal bracket 6. The bottom of the high-voltage discharge electrode 1 is a plurality of parallel external electrode structures. The grounding electrode 2 is installed on the metal base 7. The quartz glass reactor 3 is installed between the high-voltage discharge electrode 1 and the grounding electrode 2 and contacts them. A gas inlet 4 and a gas outlet 5 are respectively arranged at both ends of the quartz glass reactor 3.

[0032] In this embodiment, there are five groups of parallel external electrode structures, one of which is located in the center, and the other four groups are evenly distributed around the central group. The dielectric barrier discharge plasma device adopts multiple groups of parallel external electrode structures, which can increase the number of electrode edges of the quartz glass reactor 3 and improve the edge effect of the reactor.

[0033] In this embodiment, the quartz glass reactor 3 has a length of 70-100 cm, a width of 70-100 cm, and a height of 5-10 mm.

[0034] In this embodiment, the dielectric barrier discharge plasma device is an argon dielectric barrier discharge plasma device under atmospheric pressure, and its processing parameters are: output power of 200-500 W, argon flow rate of 1-5 L / min, and processing time of 1-3 min.

[0035] Step 3: Wind the modified insulating rod with fibers on a tubular mold, then perform vacuum pressure impregnation treatment on it with epoxy resin, and finally place it in a curing furnace for high-temperature curing to produce a fiber-modified insulating rod.

[0036] In this step, the vacuum pressure impregnation treatment can effectively avoid the existence of bubble defects after impregnation.

[0037] In this step, the conditions for high temperature curing treatment are: 80~120℃ for 2~4 hours, and 120~140℃ for 3~5 hours.

[0038] The insulating pull rod is a cylindrical core rod.

[0039] In order to illustrate the effect of the present invention, an example is given below. In this example, the aramid fiber used for insulating pull rod is treated in an argon atmosphere according to the above plasma treatment technology. The optimal plasma treatment parameters are: output power of 300 W, argon flow rate of 2 L / min, and treatment time of 2 min. The static contact angle and SEM images of the fiber before and after treatment are shown in Figure 2. Figure 4 and Figure 5 As shown in the figure, it can be seen that the static contact angle of the fiber after plasma treatment is significantly reduced, and the surface of the treated fiber is rough, uneven, and has small fragments. This shows that after the above plasma treatment, the specific surface area of ​​the fiber is increased, and the surface wettability and bonding properties are improved.

[0040] It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive. Therefore, the present invention includes but is not limited to the embodiments described in the specific implementation manner. Any other implementation manners derived by those skilled in the art based on the technical solution of the present invention also fall within the scope of protection of the present invention.

Claims

1. A fiber modification method for insulating pull rod based on dielectric barrier discharge, characterized in that: The following steps are involved: Step 1, cleaning and drying the fiber for insulating pull rod; Step 2, placing the cleaned and dried insulating rod fiber in a dielectric barrier discharge plasma device for modification; Step 3, winding the modified insulating rod with fibers on a tubular mold, then vacuum pressure impregnating it with epoxy resin, and finally placing it in a curing furnace for high-temperature curing to produce a fiber-modified insulating rod; The fiber used for the insulating pull rod is glass fiber or aramid fiber; The dielectric barrier discharge plasma device adopts an argon dielectric barrier discharge plasma device under atmospheric pressure, comprising a high-voltage discharge electrode, a grounding electrode, a quartz glass reactor, a metal bracket and a metal base, wherein the high-voltage discharge electrode is mounted on the metal bracket, the bottom of the high-voltage discharge electrode is a plurality of groups of parallel external electrode structures, the grounding electrode is mounted on the metal base, the quartz glass reactor is mounted between the high-voltage discharge electrode and the grounding electrode and in contact with each other, and a gas inlet and a gas outlet are respectively arranged at both ends of the quartz glass reactor; The dielectric barrier discharge plasma device treatment method in step 2 is: under an argon atmosphere, the output power is 200-500 W, the argon flow rate is 1-5 L / min, and the treatment time is 1-3 min.

2. The method for modifying fibers for insulating pull rods based on dielectric barrier discharge according to claim 1, characterized in that: The specific implementation method of step 1 is: place the insulating pull rod fiber in a 100° C. deionized water bath for heating and cleaning for 2 to 4 hours, then use ultrasonic cleaning for 1 to 2 hours, and finally place in a 60 to 80° C. oven for drying for 3 to 8 hours.

3. The method for modifying fibers for insulating pull rods based on dielectric barrier discharge according to claim 1, characterized in that: The insulating pull rod is a cylindrical core rod.

4. The method for modifying fibers for insulating pull rods based on dielectric barrier discharge according to claim 1, characterized in that: The conditions for high temperature curing treatment in step 3 are: first, keep the temperature at 80-120°C for 2-4 hours, and then keep the temperature at 120-140°C for 3-5 hours.

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