Special conveying pipe for electrolyte for battery and preparation method of special conveying pipe

Abstract

The invention provides a special conveying pipe for an electrolyte for a battery and a preparation method of the special conveying pipe, relates to the technical field of high polymer material processing and pipeline preparation, and solves the technical problem that a conveying pipeline in the prior art is easy to erode and age. The conveying pipe comprises an inner-layer pipe body, a middle-layer pipe body and an outer-layer pipe body from inside to outside, the inner-layer pipe body is made of a mixed material of PTFE resin and a processing agent, and the middle-layer pipe body is made of a flexible and impact-resistant polyethylene derivative or a modified polyethylene material. And the outer-layer pipe body is made of a wear-resistant, heat-resistant and corrosion-resistant plastic material. The inner layer is made of a mixed material of PTFE resin and a processing agent so as to guarantee good anti-erosion and anti-aging effects, high structural strength is guaranteed by adopting a three-layer pipe body design mode, and the comprehensive performance of the conveying pipe is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of polymer material processing and pipeline preparation, and in particular to a special delivery pipe for battery electrolyte and a preparation method thereof. Background Art

[0002] With the vigorous development of the new energy industry, the safe, stable and efficient transportation of battery electrolytes is particularly important. However, battery electrolytes are usually highly corrosive and oxidizing, which places extremely high demands on the transportation pipelines. Traditional metal or plastic pipes are easily corroded by electrolytes during long-term use, leading to problems such as leakage, aging, and performance degradation. Therefore, the development of a special battery electrolyte delivery pipe with excellent corrosion resistance, good flexibility and long life has become a current research hotspot. Summary of the invention

[0003] The purpose of the present invention is to provide a battery electrolyte dedicated delivery pipe and a preparation method thereof, which solves the technical problem of the delivery pipe being easily corroded and aged in the prior art. The preferred technical solution among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] The battery electrolyte delivery tube provided by the present invention comprises an inner tube body, an intermediate tube body and an outer tube body from inside to outside, wherein the inner tube body is made of a mixed material of PTFE resin and a processing aid, the intermediate tube body is made of a flexible and impact-resistant polyethylene derivative or modified polyethylene material, and the outer tube body is made of a wear-resistant, heat-resistant and corrosion-resistant plastic material.

[0006] Preferably, the weight percentage of the PTFE resin is in the range of 92% to 96%, and the weight percentage of the processing aid is in the range of 4% to 8%.

[0007] Preferably, the weight percentage of the PTFE resin is 94%, and the weight percentage of the processing aid is 6%.

[0008] Preferably, the intermediate layer tube body is made of ethylene-vinyl acetate copolymer or maleic anhydride grafted polyethylene.

[0009] Preferably, the outer tube body is made of heat-resistant polyethylene material.

[0010] The method for preparing the above-mentioned dedicated battery electrolyte delivery tube provided by the present invention comprises:

[0011] Preparation of the material of the inner tube body;

[0012] Selection of materials for the intermediate tube body and the outer tube body;

[0013] Start the three-layer co-extrusion extruder;

[0014] The three layers of materials are extruded simultaneously through a die;

[0015] Inspect and package the prepared delivery tube.

[0016] Preferably, the preparation of the material of the inner layer tube body comprises: uniformly mixing PTFE resin of predetermined components and processing aids in a high-speed mixer or a twin-screw extruder to form the inner layer material.

[0017] Preferably, the selection of materials for the intermediate tube body and the outer tube body includes: selecting maleic anhydride grafted polyethylene as the material for the intermediate tube body, and selecting heat-resistant polyethylene material as the material for the outer tube body.

[0018] Preferably, starting the three-layer co-extrusion extruder includes: adjusting the temperature and extrusion speed of each layer to ensure that the materials of each layer can flow evenly and adhere to each other during the extrusion process.

[0019] Preferably, extruding three layers of material simultaneously through a die comprises: extruding three layers of material simultaneously through a die to form a three-layer composite structure pipe having an inner layer, a middle layer and an outer layer; performing subsequent treatments such as cooling, sizing and cutting on the extruded pipe to obtain a battery electrolyte delivery pipe of a required length.

[0020] This application adopts the above technical solution, which has at least the following beneficial effects:

[0021] The battery electrolyte delivery pipe includes an inner tube body, an intermediate tube body and an outer tube body from inside to outside. The inner tube body is made of a mixture of PTFE resin and processing aids, the intermediate tube body is made of a flexible and impact-resistant polyethylene derivative or modified polyethylene material, and the outer tube body is made of a wear-resistant, heat-resistant and corrosion-resistant plastic material. The inner tube body is made of a mixture of PTFE resin and processing aids to ensure good anti-corrosion and anti-aging effects. The three-layer tube body design ensures strong structural strength and further improves the comprehensive performance of the delivery pipe.

[0022] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the cross-sectional structure of a dedicated battery electrolyte delivery pipe provided in an embodiment of the present invention.

[0025] In the figure, 1 is the inner tube body; 2 is the middle tube body; 3 is the outer tube body. DETAILED DESCRIPTION

[0026] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0027] The specific embodiment of the present invention provides a battery electrolyte dedicated delivery pipe, combined with the attached Figure 1 As shown, it mainly includes an inner tube body 1, a middle tube body 2 and an outer tube body 3 from inside to outside.

[0028] The material of the inner tube body 1 is a mixed material of PTFE resin and processing aids. This mixed material ensures good anti-corrosion and anti-aging effects, thereby ensuring the long-term and stable use of the battery electrolyte.

[0029] The material of the middle layer tube body 2 is a flexible and impact-resistant polyethylene derivative or modified polyethylene material to ensure good flexibility and impact resistance, and can effectively absorb and disperse external impact force, thereby protecting the inner layer from damage.

[0030] The outer tube body 3 is made of a wear-resistant, heat-resistant and corrosion-resistant plastic material, thereby ensuring the heat resistance and long-term stability of the battery electrolyte delivery tube, and having good wear resistance and corrosion resistance.

[0031] In a specific embodiment of the present application, the PTFE resin may be PTFE-M resin (polytetrafluoroethylene fine particle molding resin), the weight percentage of the PTFE resin is in the range of 92% to 96%, and the processing aid is a fluoropolymer processing aid, the weight percentage of the processing aid is in the range of 4% to 8%.

[0032] In some embodiments, the weight percentage of the PTFE resin is 94%, and the weight percentage of the processing aid is 6%. Such a component ratio provides excellent chemical corrosion resistance and a smooth inner wall, which helps to reduce the flow resistance of the electrolyte.

[0033] In some embodiments, the material of the middle layer pipe body 2 is ethylene-vinyl acetate copolymer (EVA) or maleic anhydride grafted polyethylene (MAH-G-PE). These materials have good flexibility and impact resistance, can effectively absorb and disperse external impact force, thereby protecting the inner layer from damage. At the same time, they can also form a strong bonding interface with the inner and outer layer materials to improve the overall structural stability of the pipe.

[0034] In some embodiments, the outer tube body 3 is made of heat-resistant polyethylene material, which has excellent heat resistance and long-term stability, and can be used for a long time in a high temperature environment without deformation or damage. In addition, it also has good wear resistance and corrosion resistance, and can effectively resist erosion and wear of the external environment, thereby extending the service life of the pipe. For example, the matrix of PE100 or PE80, after performance testing of these materials, the use temperature of the HDPE pipe type is ≤70°C. In addition, for the PE-RTⅠ type matrix, its use temperature is ≤90°C. By selecting these materials, the outer tube body can provide excellent wear resistance, heat resistance and corrosion resistance, and improve the use temperature condition of the pipe to ≤100°C.

[0035] The above-mentioned battery electrolyte dedicated delivery pipe disclosed in the present application can be connected by an electric fusion sleeve to ensure the sealing and strength of the connection.

[0036] A specific embodiment of the present invention provides a method for preparing a dedicated battery electrolyte delivery tube, comprising:

[0037] Preparation of materials for the inner tube body 1;

[0038] Selection of materials for the intermediate tube body 2 and the outer tube body 3;

[0039] The material of the inner tube body 1, the material of the middle tube body 2 and the material of the outer tube body 3 are sequentially added into the inner layer hopper, the middle layer hopper and the outer layer hopper of the three-layer co-extrusion extruder;

[0040] Start the three-layer co-extrusion extruder;

[0041] The three layers of materials are extruded simultaneously through a die;

[0042] Inspect and package the prepared delivery tube.

[0043] The specific preparation of the material of the inner tube body 1 includes: uniformly mixing the PTFE resin and the processing aid of the predetermined components in a high-speed mixer or a twin-screw extruder to form the inner layer material. The PTFE resin and the processing aid of the predetermined components can be specifically 94% by weight of the PTFE resin and 6% by weight of the processing aid.

[0044] Maleic anhydride grafted polyethylene is selected as the material of the intermediate layer pipe body 2.

[0045] Heat-resistant polyethylene material is selected as the material of the outer tube body 3 .

[0046] The specific process of starting the three-layer co-extrusion extruder includes: starting the three-layer co-extrusion extruder, adjusting the temperature and extrusion speed of each layer, and ensuring that the materials of each layer can flow evenly and adhere to each other during the extrusion process.

[0047] Specifically, the three-layer material is extruded through a die at the same time to form a three-layer composite structure pipe having an inner layer, a middle layer and an outer layer; the extruded pipe is subsequently subjected to cooling, sizing, cutting and other subsequent treatments to obtain a battery electrolyte delivery pipe of a required length.

[0048] Inspection package for the prepared delivery pipe includes:

[0049] Carry out appearance inspection, dimension measurement and performance test on the prepared conveying pipe to ensure that the product quality meets the requirements.

[0050] Qualified delivery pipes are packaged and marked with product name, specifications, production date and other information for easy storage and use.

[0051] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", "some examples", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0052] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A battery electrolyte delivery pipe, characterized in that: It includes an inner tube body, a middle tube body and an outer tube body from inside to outside. The inner tube body is made of a mixture of PTFE resin and processing aids, the middle tube body is made of a flexible and impact-resistant polyethylene derivative or modified polyethylene material, and the outer tube body is made of a wear-resistant, heat-resistant and corrosion-resistant plastic material.

2. The battery electrolyte delivery pipe according to claim 1, characterized in that: The weight percentage of the PTFE resin ranges from 92% to 96%, and the weight percentage of the processing aid ranges from 4% to 8%.

3. The battery electrolyte delivery pipe according to claim 1, characterized in that: The weight percentage of the PTFE resin is 94%, and the weight percentage of the processing aid is 6%.

4. The battery electrolyte delivery pipe according to claim 1, characterized in that: The material of the intermediate layer tube body is ethylene-vinyl acetate copolymer or maleic anhydride grafted polyethylene.

5. The battery electrolyte delivery pipe according to claim 1, characterized in that: The outer tube body is made of heat-resistant polyethylene material.

6. A method for preparing a battery electrolyte delivery pipe as claimed in any one of claims 1 to 5, characterized in that: include: Preparation of the material of the inner tube body; Selection of materials for the intermediate tube body and the outer tube body; Sequentially adding the material of the inner tube body, the material of the middle tube body and the material of the outer tube body into the inner hopper, the middle hopper and the outer hopper of the three-layer co-extrusion extruder; Start the three-layer co-extrusion extruder; The three layers of materials are extruded simultaneously through a die; Inspect and package the prepared delivery tube.

7. The preparation method according to claim 6, characterized in that: The preparation of the material of the inner layer tube body includes: uniformly mixing the PTFE resin of predetermined components and the processing aid in a high-speed mixer or a twin-screw extruder to form the inner layer material.

8. The preparation method according to claim 6, characterized in that: The selection of materials for the intermediate tube body and the outer tube body includes: selecting maleic anhydride grafted polyethylene as the material for the intermediate tube body, and selecting heat-resistant polyethylene material as the material for the outer tube body.

9. The preparation method according to claim 6, characterized in that: Starting a three-layer co-extrusion extruder includes adjusting the temperature and extrusion speed of each layer to ensure that the materials of each layer can flow evenly and adhere to each other during the extrusion process.

10. The preparation method according to claim 6, characterized in that: The method of simultaneously extruding three layers of materials through a die comprises: simultaneously extruding three layers of materials through a die to form a three-layer composite structure pipe having an inner layer, a middle layer and an outer layer; performing subsequent treatments such as cooling, sizing and cutting on the extruded pipe to obtain a battery electrolyte delivery pipe of a required length.

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