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Multi-layer co-extrusion electromagnetic shielding fluoroplastic electric insulation corrugated pipe and preparation method thereof

An electromagnetic shielding and multi-layer co-extrusion technology, which is applied in the direction of magnetic/electric field shielding, insulators, insulators, etc., can solve the urgent demand for high-performance electromagnetic shielding plastic bellows, affect the performance of equipment and electrical appliances, and improve the electromagnetic shielding effect , Improve the effect of strengthening and preventing volatilization

Active Publication Date: 2022-02-18
深圳国氟新材科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electromagnetic scattering of equipment, electrical wires and interfaces will also directly affect the performance of equipment and electrical appliances. At present, it has not been paid attention to and solved. The demand for high-performance electromagnetic shielding plastic bellows is becoming more and more urgent.

Method used

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  • Multi-layer co-extrusion electromagnetic shielding fluoroplastic electric insulation corrugated pipe and preparation method thereof
  • Multi-layer co-extrusion electromagnetic shielding fluoroplastic electric insulation corrugated pipe and preparation method thereof
  • Multi-layer co-extrusion electromagnetic shielding fluoroplastic electric insulation corrugated pipe and preparation method thereof

Examples

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preparation example Construction

[0032]In one embodiment according to the present invention, the preparation method of maleic anhydride grafted meltable hydrogen-containing fluoroplastics comprises the following steps: dissolving maleic anhydride in absolute ethanol to prepare a solution with a mass concentration of 30-50%; spraying the solution Pour in the meltable hydrogen-containing fluoroplastics in a high-speed mixer, stir evenly at a high speed, dry in a blast drying oven at 90-100°C for 2-5h, and then irradiate with gamma rays at a temperature of 80-90°C. According to the dose of 1-2 Mrad, the pre-grafting mixture is obtained; the pre-grafting mixture is extruded and granulated by a different-rotational meshing twin-screw extruder to obtain a maleic anhydride grafted meltable hydrogen-containing fluoroplastic.

[0033] Next, the preparation method of the multi-layer co-extrusion electromagnetic shielding fluoroplastic electrical insulation corrugated pipe according to the second aspect of the present in...

Embodiment 1

[0050] First, prepare maleic anhydride grafted ethylene-tetrafluoroethylene (ETFE) copolymer: maleic anhydride is dissolved in absolute ethanol to prepare a solution with a mass concentration of 30%; the solution is sprayed on the ethylene-tetrafluoroethylene in a high-speed mixer In the copolymer (ETFE), stir evenly at a high speed, blow dry at 90° C. for 2 hours in a blast drying oven, and then irradiate with gamma rays at a temperature of 80° C. with a radiation dose of 1 Mrad to obtain a pre-grafted mixture; The pre-grafted mixture is extruded and granulated by a counter-intermeshing twin-screw extruder to obtain maleic anhydride grafted ethylene-tetrafluoroethylene copolymer (ETFE).

[0051] Next, prepare insulating masterbatch: (1) dissolve triallyl isocyanurate (TAIC) in absolute ethanol to prepare a solution with a mass concentration of 30%; (2) spray the solution on ethylene-tetrafluoroethylene in a high-speed mixer Ethylene fluoride copolymer (ETFE) and maleic anhydr...

Embodiment 2

[0055] First, maleic anhydride grafted polyvinylidene fluoride (PVDF): maleic anhydride was dissolved in absolute ethanol to prepare a solution with a mass concentration of 50%; the solution was sprayed in polyvinylidene fluoride (PVDF) in a high-speed mixer, Stir evenly at high speed, dry in a blast drying oven at 90°C for 2 hours, then irradiate with gamma rays at a temperature of 80°C, and the irradiation dose is 1 Mrad to obtain a pre-grafted mixture; the pre-grafted mixture is used Extrude and granulate to an intermeshing twin-screw extruder to obtain maleic anhydride grafted polyvinylidene fluoride (PVDF).

[0056] Next, prepare the insulation masterbatch: (1) dissolve triallyl cyanurate (TAC) in absolute ethanol to prepare a solution with a mass concentration of 50%; (2) spray the solution on polyvinylidene fluoride in a high-speed mixer Ethylene (PVDF) and maleic anhydride grafted polyvinylidene fluoride (PVDF), stirred evenly at high speed, dried in a blast drying ove...

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Abstract

The invention provides a multi-layer co-extrusion electromagnetic shielding fluoroplastic electric insulation corrugated pipe and a preparation method thereof. The pipe comprises an insulating layer and an electromagnetic shielding layer, the wall thickness of the insulating layer is 0.1-2 mm, and the wall thickness of the electromagnetic shielding layer is 0.1-3 mm. The insulating layer is an inner insulating layer and / or an outer insulating layer, the inner insulating layer is located on the inner side of the electromagnetic shielding layer, and the outer insulating layer is located on the outer side of the electromagnetic shielding layer. The preparation method comprises the following steps: respectively putting an insulating master batch and an electromagnetic shielding master batch into corresponding extruders, carrying out multi-layer co-extrusion to extrude a fluoroplastic straight pipe, continuously forming a fluoroplastic straight pipe which is not completely cooled in a corrugated pipe equipment mold, performing cooling and shaping by circulating cold water, and performing rolling by a rolling machine. According to the invention, multi-layer co-extrusion and one-step corrugation forming are adopted, so that the pipe has electromagnetic shielding effectiveness at different frequency bands of 14 kHz to 30 MHz, 30 MHz to 1 GHz and 1 GHz to 18 GHz, has single-layer electric insulation and double-layer electric insulation functions, and also has the characteristics of low temperature resistance, high temperature resistance, aging resistance, long service life, salt mist resistance, corrosion resistance, flame retardance, ring flexibility and the like.

Description

technical field [0001] The invention relates to the fields of electromagnetic shielding and cables, in particular to a multi-layer co-extruded electromagnetic shielding fluoroplastic electrical insulation corrugated pipe and a preparation method thereof. Background technique [0002] Plastic bellows are widely used in important pipelines in aerospace, military, petrochemical, chemical, power metallurgy and other industries. Such as fixed-wing aircraft, helicopters, automobiles, communication equipment, engineering equipment and other wire harness protection and finishing, it is widely used. Plastic bellows mainly include: PE bellows, PA bellows, PP bellows, PVC bellows, etc. They have a certain lifespan, waterproof, dustproof, and easy to bend, but they also have weaknesses and deficiencies in varying degrees. Such as: PE corrugated pipes are not resistant to high temperature, PA corrugated pipes are flammable, PP corrugated pipes have insufficient weather resistance, PVC ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/30B32B27/32B32B27/06B32B1/08B32B3/28B29B7/00B29B9/06B29B13/06B29B13/08B29C48/00B29C48/09B29C48/18H01B17/58H01B19/00H05K9/00
CPCB32B27/304B32B27/32B32B27/08B32B1/08B32B3/28B29B13/08B29B13/065B29B9/06B29B7/005B29C48/0019B29C48/09B29C48/18H05K9/0081H01B17/58H01B19/00B32B2250/246B32B2307/206B32B2307/212B32B2307/558B32B2307/306B32B2307/714B32B2597/00B29L2009/00B29L2023/18Y02A20/20
Inventor 刘建团郏欣欣
Owner 深圳国氟新材科技发展有限公司
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