Thermoplastic insulating material for plastic packaging lightning arrester core and preparation method of thermoplastic insulating material

Abstract

The invention discloses a thermoplastic insulating material for a plastic package lightning arrester core and a preparation method of the thermoplastic insulating material, the thermoplastic insulating material comprises the following raw materials in parts by weight: 50-70 parts of polyamide resin, 30-50 parts of reinforced fibers, 3-10 parts of a toughening agent, 0-5 parts of color masterbatch and 0.5-1 part of an additive, the polyamide resin is one or more of PA6 (polyamide 6) and PA66 (polyamide 66) in aliphatic polyamide. The invention further discloses application in the field of plastic package lightning arresters and tensioning insulators. By means of the composite material, higher strength can be provided, and due to low water absorption and high resistivity of the material, the composite material can still keep high resistivity and dimensional stability in an outdoor long-term humid environment.

Description

Technical Field

[0001] The invention relates to the technical field of insulating materials for arrester cores, in particular to a thermoplastic insulating material for plastic-sealed arrester cores and a preparation method thereof. Background Art

[0002] Lightning arresters have two functions: the first is an electrical device used to protect electrical equipment from high transient overvoltage hazards and limit the follow-on time and often the follow-on amplitude; the second is another important device often used to prevent communication cables from being damaged by lightning.

[0003] The surface of the arrester is generally wrapped with thermoplastic insulating material. At present, most of the thermoplastic insulating materials used in arresters on the market are generally in the following forms: one part is made of PBT fiber-reinforced composite materials, but the strength of PBT fiber-reinforced composite materials is relatively low. If it is subjected to long-term stress, it is easy to crack; the other part is made of conventional polyamide fiber-reinforced composite materials. This type of material has a high water absorption rate, so after long-term use, its dimensional stability is relatively low. Secondly, due to the low resistivity caused by water absorption, it is easy to have breakdown and damage under high voltage conditions, so it needs to be replaced regularly. Therefore, the current thermoplastic insulating materials for arresters have the above problems and need to be improved. Summary of the invention

[0004] The object of the present invention is to provide a thermoplastic insulating material for a plastic-sealed lightning arrester core and a preparation method thereof, so as to solve the problems mentioned in the above background technology that the existing thermoplastic insulating materials have low strength and are easy to break, and have high water absorption, which leads to easy breakdown and damage under high voltage.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical embodiments: a thermoplastic insulating material used for the core of a plastic-sealed lightning arrester, the raw materials of the thermoplastic insulating material comprising raw materials in the following weight proportions: 50-70 parts of polyamide resin, 30-50 parts of reinforcing fiber, 3-10 parts of toughening agent, 0-5 parts of masterbatch and 0.5-1 part of additives, wherein the polyamide resin adopts one or more of PA6 and PA66 in aliphatic polyamides, and the additives include a primary antioxidant, a secondary antioxidant and a dispersant.

[0006] Preferably, the reinforcing fiber is one of glass fiber, carbon fiber and aramid fiber.

[0007] Preferably, the masterbatch is a black masterbatch or a red masterbatch.

[0008] Preferably, the toughening agent is a polyolefin containing polar groups.

[0009] Preferably, the polyolefin containing polar groups is one or more of MAH-g-SEBS, MAH-g-POE, ethylene-methyl acrylate copolymer or GMA-g-POE.

[0010] Preferably, the reinforcing fibers include glass fibers and / or carbon fibers.

[0011] Preferably, the primary antioxidant is selected from one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, tris(2,4-di-tert-butylphenyl) phosphite, and 4,4'-thiobis(6-tert-butyl-3-methylphenol).

[0012] Preferably, the auxiliary antioxidant is hydroxybenzophenone or phosphate.

[0013] Preferably, the dispersant is N,N-dimethylformamide.

[0014] The present invention also discloses a method for preparing a thermoplastic insulating material used for a core of a plastic-sealed lightning arrester, the method comprising:

[0015] The raw materials of various components are mixed uniformly according to weight proportions, and then fed into a twin-screw extruder, extruded, granulated, and dried to obtain a thermoplastic polyamide composite material.

[0016] Preferably, the extrusion temperature is 180-275° C., the aspect ratio of the twin-screw extruder is 36-60 / 1, and the residence time of the material in the screw is 40-90 seconds.

[0017] Preferably, the present invention also discloses the application of the thermoplastic insulating material used for the core of the plastic-sealed lightning arrester in the electric power field, such as a plastic-sealed lightning arrester or a tension insulator.

[0018] Compared with the prior art, the beneficial effects of the present invention are: the present invention can be applied in the field of plastic-sealed lightning arresters and tension insulators, and can provide higher strength, low water absorption of the material, and high resistivity so that it can maintain high resistivity and dimensional stability even in a long-term humid outdoor environment. DETAILED DESCRIPTION

[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical embodiments in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Embodiment 1:

[0021] The present embodiment discloses a thermoplastic insulating material for the core of a plastic-sealed lightning arrester, wherein the raw materials of the thermoplastic insulating material include raw materials in the following weight proportions: 50-70 parts of polyamide resin, 30-50 parts of reinforcing fiber, 3-10 parts of toughening agent, 0-5 parts of masterbatch and 0.5-1 part of additives, wherein the polyamide resin adopts one or more of PA6 and PA66 in aliphatic polyamides, and the additives include a primary antioxidant, a secondary antioxidant and a dispersant.

[0022] Preferably, the reinforcing fiber is one of glass fiber, carbon fiber and aramid fiber.

[0023] Preferably, the masterbatch is a black masterbatch or a red masterbatch. In the present embodiment, the masterbatch is black.

[0024] Preferably, the toughening agent is a polyolefin containing polar groups.

[0025] Preferably, the polyolefin containing polar groups is one or more of MAH-g-SEBS, MAH-g-POE, ethylene-methyl acrylate copolymer or GMA-g-POE.

[0026] Preferably, the reinforcing fibers include glass fibers and / or carbon fibers; preferably, the reinforcing fibers are glass fibers.

[0027] This embodiment also discloses a method for preparing a thermoplastic insulating material used for a core of a plastic-sealed lightning arrester, the method comprising:

[0028] The raw materials of various components are mixed uniformly according to weight proportions, and then fed into a twin-screw extruder, extruded, granulated, and dried to obtain a thermoplastic polyamide composite material.

[0029] Preferably, the extrusion temperature is 180-275°C, the aspect ratio of the twin-screw extruder is 36-60 / 1, and the material residence time in the screw is 40-90s. In the present embodiment, the extrusion temperature is 225°C, the aspect ratio of the twin-screw extruder is 40 / 1, and the material residence time in the screw is 50s.

[0030] Preferably, the present embodiment also discloses the application of the thermoplastic insulating material used for the core of the plastic-sealed lightning arrester in the electric power field, such as a plastic-sealed lightning arrester or a tension insulator.

[0031] In this embodiment, the primary antioxidant is selected from one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, tris(2,4-di-tert-butylphenyl) phosphite, and 4,4'-thiobis(6-tert-butyl-3-methylphenol).

[0032] The auxiliary antioxidant is hydroxybenzophenone or phosphate.

[0033] The dispersant is N,N-dimethylformamide.

[0034] In this embodiment, the raw materials of the thermoplastic insulating material include raw materials in the following weight ratio: 65 parts of polyamide resin A6, 30 parts of glass fiber, 5 parts of toughening agent, 3 parts of masterbatch, 0.2 parts of primary antioxidant, 0.3 parts of auxiliary antioxidant and 0.3 parts of dispersant.

[0035] Embodiment 2:

[0036] The present embodiment discloses a thermoplastic insulating material for a core of a plastic-sealed lightning arrester, wherein the raw materials of the thermoplastic insulating material include raw materials in the following weight ratio: 65 parts of polyamide resin A66, 30 parts of carbon fiber, 5 parts of toughening agent, 3 parts of masterbatch, 0.2 parts of primary antioxidant, 0.3 parts of auxiliary antioxidant and 0.3 parts of dispersant.

[0037] Embodiment 3:

[0038] The present embodiment discloses a thermoplastic insulating material for a core of a plastic-sealed lightning arrester, wherein the raw materials of the thermoplastic insulating material include raw materials in the following weight ratio: 55 parts of polyamide resin A6, 40 parts of reinforcing fiber, 5 parts of toughening agent, 3 parts of masterbatch, 0.2 parts of primary antioxidant 1, 0.3 parts of secondary antioxidant 2 and 0.3 parts of dispersant.

[0039] Embodiment 4:

[0040] The present embodiment discloses a thermoplastic insulating material for a core of a plastic-sealed lightning arrester, wherein the raw materials of the thermoplastic insulating material include raw materials in the following weight ratio: 55 parts of polyamide resin A66, 40 parts of reinforcing fiber, 5 parts of toughening agent, 3 parts of masterbatch, 0.2 parts of primary antioxidant, 0.3 parts of auxiliary antioxidant and 0.3 parts of dispersant.

[0041] Embodiment 5:

[0042] The present embodiment discloses a thermoplastic insulating material for a core of a plastic-sealed lightning arrester, wherein the raw materials of the thermoplastic insulating material include raw materials in the following weight ratio: 50 parts of polyamide resin A6, 45 parts of reinforcing fiber, 5 parts of toughening agent, 3 parts of masterbatch, 0.2 parts of primary antioxidant, 0.3 parts of auxiliary antioxidant and 0.3 parts of dispersant.

[0043] Embodiment 6:

[0044] The present embodiment discloses a thermoplastic insulating material for a core of a plastic-sealed lightning arrester, wherein the raw materials of the thermoplastic insulating material include raw materials in the following weight ratio: 50 parts of polyamide resin A66, 45 parts of reinforcing fiber, 5 parts of toughening agent, 0.2 parts of primary antioxidant, 0.3 parts of auxiliary antioxidant and 0.3 parts of dispersant.

[0045] Embodiment 7:

[0046] The present embodiment discloses a thermoplastic insulating material for a core of a plastic-sealed lightning arrester, wherein the raw materials of the thermoplastic insulating material include raw materials in the following weight ratio: 35 parts of polyamide resin A6, 30 parts of polyamide resin A66, 30 parts of reinforcing fiber, 5 parts of toughening agent, 0.2 parts of primary antioxidant, 0.3 parts of auxiliary antioxidant and 0.3 parts of dispersant.

[0047] Embodiment 8:

[0048] The present embodiment discloses a thermoplastic insulating material for a core of a plastic-sealed lightning arrester, wherein the raw materials of the thermoplastic insulating material include raw materials in the following weight ratio: 30 parts of polyamide resin A6, 35 parts of polyamide resin A66, 40 parts of reinforcing fibers, 5 parts of a toughening agent, 0.2 parts of a primary antioxidant, 0.3 parts of a secondary antioxidant, and 0.3 parts of a dispersant.

[0049] Embodiment 9:

[0050] The present embodiment discloses a thermoplastic insulating material for a core of a plastic-sealed lightning arrester, wherein the raw materials of the thermoplastic insulating material include raw materials in the following weight ratio: 25 parts of polyamide resin A6, 25 parts of polyamide resin A66, 45 parts of reinforcing fibers, 5 parts of a toughening agent, 0.2 parts of a primary antioxidant, 0.3 parts of a secondary antioxidant, and 0.3 parts of a dispersant.

[0051] Embodiment 10:

[0052] The present embodiment discloses a thermoplastic insulating material for a core of a plastic-sealed lightning arrester, wherein the raw materials of the thermoplastic insulating material include raw materials in the following weight ratio: 35 parts of polyamide resin A6, 15 parts of polyamide resin A66, 45 parts of reinforcing fibers, 5 parts of a toughening agent, 0.2 parts of a primary antioxidant, 0.3 parts of a secondary antioxidant, and 0.3 parts of a dispersant.

[0053] For ease of viewing, the following table is used to illustrate the weight proportions of each ratio for reference.

[0054]

[0055]

[0056] At the same time, the thermoplastic insulating materials prepared in the above-mentioned embodiments are tested according to the experimental table standards of the following performance parameters to ensure that the thermoplastic insulating materials prepared in each embodiment meet the relevant requirements of Shore hardness, elongation, bending strength, compressive strength, dielectric constant and anti-leakage trace.

[0057] Test items: Main performance parameters of thermoplastic insulation materials used in plastic-sealed arrester cores:

[0058]

[0059]

[0060] After testing, the following comprehensive test results were obtained

[0061] Example Final Result 1 pass 2 Not passed 3 pass 4 Not passed 5 pass 6 Not passed 7 Not passed 8 Not passed 9 Not passed 10 pass

[0062] In summary, Example 1, Example 3, Example 5 and Example 10 are regarded as the optimal ratio requirements, and the ratios of Example 2, Example 4, Example 6, Example 7, Example 8 and Example 9 do not meet the requirements and are therefore not referenced.

[0063] In summary, the present invention is applied in the field of plastic-sealed lightning arresters and tension insulators, and can provide higher strength. The low water absorption and high resistivity of the material enable it to maintain a high resistivity and dimensional stability even in a long-term humid outdoor environment.

[0064] This technical solution is the result of our company's long-term cooperation with the power industry, especially the arrester industry and most companies in this industry to adjust the formula. The companies in this industry use it to test and verify on the core of plastic-sealed arresters, and the final formula is suitable for the core of plastic-sealed arresters.

[0065] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical embodiments described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A thermoplastic insulating material for a core of a plastic-sealed lightning arrester, characterized in that: The raw materials of the thermoplastic insulating material include raw materials in the following weight ratios: 50-70 parts of polyamide resin, 30-50 parts of reinforcing fiber, 3-10 parts of toughening agent, 0-5 parts of masterbatch and 0.5-1 parts of additives, wherein the polyamide resin adopts one or more of PA6 and PA66 in aliphatic polyamides, and the additives include primary antioxidants, secondary antioxidants and dispersants.

2. The thermoplastic insulating material for the core of a plastic-sealed lightning arrester according to claim 1, characterized in that: The reinforcing fiber is one of glass fiber, carbon fiber and aramid fiber.

3. The thermoplastic insulating material for the core of a plastic-sealed lightning arrester according to claim 1, characterized in that: The masterbatch is a black masterbatch or a red masterbatch.

4. The thermoplastic insulating material for the core of a plastic-sealed lightning arrester according to claim 1, characterized in that: The toughening agent is a polyolefin containing polar groups.

5. The thermoplastic insulating material for the core of a plastic-sealed lightning arrester according to claim 4, characterized in that: The polyolefin containing polar groups is one or more of MAH-g-SEBS, MAH-g-POE, ethylene-methyl acrylate copolymer or GMA-g-POE.

6. The thermoplastic insulating material for the core of a plastic-sealed lightning arrester according to claim 1, characterized in that: The reinforcing fibers include glass fibers and / or carbon fibers.

7. A method for preparing a thermoplastic insulating material for a core of a plastic-sealed lightning arrester as claimed in claim 1, characterized in that: The method comprises: The raw materials of various components are mixed uniformly according to weight proportions, and then fed into a twin-screw extruder, extruded, granulated, and dried to obtain a thermoplastic polyamide composite material.

8. A thermoplastic insulating material for a plastic-sealed arrester core according to claim 7, wherein the extrusion temperature is 180-275°C, the aspect ratio of the twin-screw extruder is 36-60 / 1, and the residence time of the material in the screw is 40-90s.

9. Thermoplastic insulating material used for the core of a plastic-sealed lightning arrester prepared by the method according to any one of claims 7 to 8.

10. Application of the thermoplastic insulating material used for the core of the plastic-encapsulated lightning arrester according to any one of claims 1 to 6 in the field of electric power, such as a plastic-encapsulated lightning arrester or a tension insulator.

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