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Polytetrafluoroethylene spun-fiber waterproof acoustic-transmission membrane and production method thereof

A PTFE spinning, waterproof sound-permeable membrane technology, applied in the direction of membrane structure, textile and papermaking, non-planar diaphragm/paper cone, etc. performance degradation, etc.

Active Publication Date: 2019-10-22
HANGZHOU COBETTER FILTRATION EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the membrane product consists of laminated multi-layer stretched fiber membranes, there is a risk of delamination of the upper and lower layers, and the sound transmission performance is also reduced
In addition, the process of stretching the ePTFE membrane cannot adjust the fiber diameter, fiber gap and membrane thickness of the ePTFE membrane separately, and the membrane parameters are changed as a whole, which limits the applicability

Method used

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  • Polytetrafluoroethylene spun-fiber waterproof acoustic-transmission membrane and production method thereof
  • Polytetrafluoroethylene spun-fiber waterproof acoustic-transmission membrane and production method thereof
  • Polytetrafluoroethylene spun-fiber waterproof acoustic-transmission membrane and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of PTFE spinning fiber membrane 5

[0031] a. Nanoparticle suspension of polytetrafluoroethylene PTFE with an average particle diameter of 230 nm and a mass fraction of 50% and an aqueous solution of polyoxyethylene PEO with a mass fraction of 1% and an average molecular weight of 100,000 g / mol at a ratio of 1:30 The mass ratio was mixed, and heated and stirred at 20 ° C for 5 h to obtain a uniformly mixed slurry 1;

[0032] b. Remove the air bubbles in the mixed slurry 1 in an ultrasonic water bath at 20 °C and 20 kHz for 60 min;

[0033] c. Put the slurry 1 that has been stirred and treated in an ultrasonic water bath into the syringe barrel. The distance between the silk plates is 10 cm, and the speed of 10 cm / min moves back and forth between the horizontal distance of 5 cm; while the spinneret 2 moves back and forth horizontally, the slurry 1 is ejected at the speed of 0.1 ml / h, and the ejected slurry Material 1 is spun into polytetrafluoroethylene...

Embodiment 2

[0044] (1) Preparation of PTFE spinning fiber membrane 5

[0045]a. The nanoparticle suspension of polytetrafluoroethylene PTFE with an average particle diameter of 230 nm and a mass fraction of 65% and an aqueous solution of polyoxyethylene PEO with a mass fraction of 10% and an average molecular weight of 1,000,000 g / mol are 1:150 The mass ratio was mixed, and heated and stirred at 35 ° C for 3 h to obtain a uniformly mixed slurry 1;

[0046] b. Remove the air bubbles in the slurry 1 in an ultrasonic water bath at 35 °C and 30 kHz for 30 min;

[0047] c. Add the slurry 1 that has been stirred and treated in an ultrasonic water bath into the syringe barrel. The distance between the silk plates is 30 cm, and the horizontal distance of 30 cm is moved back and forth at a speed of 30 cm / min; while the spinneret 2 is moving back and forth horizontally, the slurry 1 is ejected at a speed of 5 ml / h, and the ejected Slurry 1 is spun into polytetrafluoroethylene fiber filaments unde...

Embodiment 3

[0058] (1) Preparation of PTFE spinning fiber membrane 5

[0059] a. The nanoparticle suspension of polytetrafluoroethylene PTFE with an average particle diameter of 230 nm and a mass fraction of 80% and an aqueous solution of polyoxyethylene PEO with a mass fraction of 20% and an average molecular weight of 100,000,000 g / mol at a ratio of 1:300 The mass ratio was mixed, and heated and stirred at 50 ° C for 5 h to obtain a uniformly mixed slurry 1;

[0060] b. Remove the air bubbles in the mixed slurry in an ultrasonic water bath at 50 °C and 40 kHz for 60 min;

[0061] c. Put the slurry 1 that has been stirred and treated in an ultrasonic water bath into the syringe barrel. The distance between the silk plates is 40 cm, and it moves back and forth between the horizontal distance of 50 cm at a speed of 50 cm / min; the spinneret 2 ejects the slurry 1 at a speed of 10 ml / h while moving back and forth horizontally, and the ejected Slurry 1 is spun into polytetrafluoroethylene fi...

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Abstract

The invention provides a polytetrafluoroethylene spun-fiber waterproof acoustic-transmission membrane and a production method thereof. The polytetrafluoroethylene spun-fiber waterproof acoustic-transmission membrane comprises a polytetrafluoroethylene spun-fiber membrane and double-sided adhesive tape adhered to edges on two sides of the polytetrafluoroethylene spun-fiber membrane. The productionmethod includes: producing the polytetrafluoroethylene spun-fiber membrane through an electrostatic spinning method; producing the polytetrafluoroethylene spun-fiber waterproof acoustic-transmission membrane. The microstructure of the polytetrafluoroethylene spun-fiber membrane produced through an electrostatic spinning method is characterized in that polytetrafluoroethylene spun-fibers are stacked, molecular chains on nodes among the fibers intertwine, and the microstructure is less prone to deformation when being impacted by water. The polytetrafluoroethylene spun-fiber waterproof acoustic-transmission membrane produced by the polytetrafluoroethylene spun-fiber membrane is high in tensile strength, stable in structure, good in applicability and excellent in waterproof and acoustic-transmission performance, the optimal waterproof grade of the polytetrafluoroethylene spun-fiber waterproof acoustic-transmission membrane is IPX6 / IPX8 (multipurpose), and the maximum loss of sounds with the frequency being 5kHz is 6dB.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a polytetrafluoroethylene spun fiber waterproof sound-permeable membrane and a preparation method thereof. Background technique [0002] Electronic products such as mobile phones, smart watches, and smart headphones generally transmit sound through electroacoustic conversion devices such as microphones, speakers, and receivers. In order to reduce water damage to electronic products, a waterproof sound-permeable membrane is usually installed outside the electro-acoustic conversion device to achieve the purpose of waterproof and sound transmission. [0003] The contact angle between polytetrafluoroethylene film PTFE and water is 118°, which is the largest among all kinds of materials. It has good waterproof performance, and has excellent chemical corrosion resistance, high and low temperature resistance and anti-aging performance. preferred material. [0004] Traditional PTFE m...

Claims

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Application Information

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IPC IPC(8): D04H1/728D04H1/4318D06C7/00H04R7/12
CPCD04H1/4318D04H1/728D06C7/00H04R7/12
Inventor 蔡梁
Owner HANGZHOU COBETTER FILTRATION EQUIP
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