A kind of preparation method of high moisture permeability polytetrafluoroethylene film

A polytetrafluoroethylene and moisture-permeable technology is applied in the field of preparation of high moisture-permeable polytetrafluoroethylene films, which can solve the problems of poor moisture permeability and poor uniformity of PTFE films, achieve good stability and improve the effects of stuffy heat problems.

Active Publication Date: 2019-04-05
NANJING FIBERGLASS RES & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the defects of poor moisture permeability and poor uniformity of PTFE membranes in the prior art, the invention provides a preparation method of high moisture permeability polytetrafluoroethylene film

Method used

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  • A kind of preparation method of high moisture permeability polytetrafluoroethylene film
  • A kind of preparation method of high moisture permeability polytetrafluoroethylene film

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The preparation method of high moisture-permeable polytetrafluoroethylene film comprises the following steps connected in sequence:

[0036] (1) Mixing: mix polytetrafluoroethylene resin and extrusion aid in a ratio of 100:15 on a ball mill, the ball milling speed is 20r / min, and the mixing time is 20min;

[0037] (2) Primary molding: put the raw materials uniformly mixed in the previous process into the aging box, fully infiltrate at 45°C for 18 hours, and enter the equipment used for primary molding. The equipment used for primary molding includes sequential connection from top to bottom The blanking machine, push rod, film extruder, storage rack and pressure roller, the blanking machine includes two oil cylinders arranged up and down, and the feeding port is provided on the blanking machine; the storage rack includes a fixed frame and a fixed frame. More than two horizontal rods parallel to each other, all horizontal rods are parallel to the horizontal plane; there a...

Embodiment 2

[0046] The preparation method of high moisture-permeable polytetrafluoroethylene film comprises the following steps connected in sequence:

[0047] (1) Mixing: mix polytetrafluoroethylene resin and extrusion aid in a ratio of 100:20 on a ball mill, the ball milling speed is 30r / min, and the mixing time is 15min;

[0048] (2) Primary molding: Put the raw materials uniformly mixed in the previous process into the aging box, fully soak for 20 hours at a temperature of 45°C, and enter the equipment used for primary molding. The equipment used for primary molding includes sequential connection from top to bottom The blanking machine, push rod, film extruder, storage rack and pressure roller, the blanking machine includes two oil cylinders arranged up and down, and the feeding port is provided on the blanking machine; the storage rack includes a fixed frame and a fixed frame. More than two horizontal rods parallel to each other, all horizontal rods are parallel to the horizontal pla...

Embodiment 3

[0057] The preparation method of high moisture-permeable polytetrafluoroethylene film comprises the following steps connected in sequence:

[0058] (1) Mixing: mix polytetrafluoroethylene resin and extrusion aid in a ratio of 100:30 on a ball mill, the ball milling speed is 20r / min, and the mixing time is 20min;

[0059] (2) Primary molding: Put the raw materials uniformly mixed in the previous process into the aging box, fully infiltrate at 45°C for 22 hours, and enter the equipment used for primary molding. The equipment used for primary molding includes sequential connection from top to bottom The blanking machine, push rod, film extruder, storage rack and pressure roller, the blanking machine includes two oil cylinders arranged up and down, and the feeding port is provided on the blanking machine; the storage rack includes a fixed frame and a fixed frame. More than two horizontal rods parallel to each other, all horizontal rods are parallel to the horizontal plane; there a...

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Abstract

The invention discloses a preparation method for a high-moisture-permeability polytetrafluoroethylene film. The method includes the following successive steps that A, materials are mixed, specifically, polytetrafluoroethylene resin and an extrusion aid are fully mixed on a ball mill, so that a mixture is obtained; B, primary molding is conducted, specifically, the mixture obtained in the step A is pushed and pressed, so that a base film is output; and C, bidirectional synchronous stretching is conducted, specifically, the base film obtained in the step B is stretched synchronously in two directions, sintering and cooling are conducted, and the high-moisture-permeability polytetrafluoroethylene film is prepared. By means of the preparation method, the polytetrafluoroethylene film which is high in moisture permeability, high in uniformity, excellent in mechanical property and good in appearance can be prepared, the method can be used for continuously producing polytetrafluoroethylene films which are stable in appearance and performance in batches, and the stuffiness problem of clothes covered with PTFE films is effectively solved.

Description

technical field [0001] The invention relates to a preparation method of a high moisture-permeable polytetrafluoroethylene film, which belongs to the field of film preparation. Background technique [0002] PTFE film is currently widely used in clothing. Many garments on the market, especially jackets, use PTFE film as the functional layer, but they all expose the problem of stuffiness, so it is necessary to improve the moisture permeability of the film. [0003] At present, the preparation method of PTFE film consists of six processes: mixing, billeting, extrusion, calendering, longitudinal drawing, and transverse drawing. Product performance; the three steps of billeting, extrusion, and calendering are important processes that affect the formation of fibers. The mixed powder is made into a green body, which is taken out and transported to the pushing and extrusion place. During this process, the green body will expand, which will cause Due to the difference in compactness...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29D7/01
CPCB29D7/01
Inventor 余佳彬范凌云黎鹏费传军郭晓蓓方岩张振
Owner NANJING FIBERGLASS RES & DESIGN INST CO LTD
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