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Preparation method of expanding microporous poly tetrafluoroethylene

A polytetrafluoroethylene membrane and microporous technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. and other problems, to achieve the effect of high uniformity, high tensile breaking strength, and improved product performance

Inactive Publication Date: 2007-08-01
SINOMA SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] According to the production method of "extrusion first, then calendering", during the calendering process, when the extrusion belt passes through the calender rollers, the material flows to the middle and both sides at the same time. There is a problem of uneven flow on both sides and in the middle. In this way, it is very easy to cause the calendering belt to tear or cause the calendering belt to produce a skirt; A large number of lines are formed, which affects the uniformity of the micro-network structure of "microfiber-nodes", and affects the appearance quality of ePTFE membrane

Method used

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  • Preparation method of expanding microporous poly tetrafluoroethylene
  • Preparation method of expanding microporous poly tetrafluoroethylene
  • Preparation method of expanding microporous poly tetrafluoroethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The raw material of polytetrafluoroethylene resin used in this example is a commercially available high molecular weight (molecular weight: 8,000,000) dispersed polytetrafluoroethylene resin, and the auxiliary agent is a mixture of aromatic hydrocarbon isoparaffin and aviation kerosene. Follow these steps:

[0034] (1) Mixing: Fully stir the high molecular weight polytetrafluoroethylene resin and the auxiliary agent in a mixer in a ratio of 100:30;

[0035] (2) Blanking: Put the raw materials uniformly mixed in the previous process into an oven (at a temperature of 40°C) and fully infiltrate them for 12 hours, and make a cylindrical green body with a diameter of 104mm through a preforming device;

[0036] (3) Extrusion: Extrude with a flat die with a flat die with an aspect ratio of 70:1, the compression ratio is 10, and the extrusion speed is 1m / min, so that the cylindrical body is transformed into a flat sheet The sheet is 244mm wide and 3.48mm thick, and the extrusi...

Embodiment 2

[0041] The steps are the same as those in Example 1, and its process parameters are compared with those in Example 1, except for the following differences. The difference is that the selected compression ratio in the extrusion step is 30, the width of the extruded sheet is 200 mm, the thickness is 1.4 mm, and the thickness of the prepared film is 22.5 μm.

Embodiment 3

[0043] The steps are the same as those in Example 1, and its process parameters are compared with those in Example 1, except for the following differences. The difference is that the diameter of the cylindrical body made by the preforming device is 60 mm, the extruded sheet is 200 mm wide and 1.4 mm thick, and the prepared film thickness is 21.2 μm.

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Abstract

An expanded micropore polytetrafluoroethylene film (it is named ePTFE film briefly) Preparation is an improved method of the existing polytetrafluoroethylene film preparation. It includes mixing materials, striking adobe, squeezing, pulling longitudinally and pulling horizontally, it is characterized by: using the mold head of flat finish mold in squeezing procedure; adding glazing procedure between the squeezing procedure and pulling longitudinally procedure. The ePTFE film prepared by the technology can balance two important physics properties of permeability and stretching splitting strong force of ePTFE film and gain the ePTFE film with high permeability, high stretching splitting strong force, high uniformity and good appearance. The invention can be uses for produce mass ePTFE film with stabilizing appearance and property and improve the products property of the ePTFE film effectively.

Description

technical field [0001] The preparation method of expanded microporous polytetrafluoroethylene membrane (hereinafter referred to as ePTFE membrane) is an improvement to the existing ePTFE membrane preparation method. Background technique [0002] PTFE has excellent high and low temperature performance, outstanding chemical stability, and good dielectric properties and hydrophobicity. The ePTFE membrane made of polytetrafluoroethylene is a membrane material with excellent performance for filtering and separating fine particles. It is widely used in dusty flue gas filtration in cement, metallurgy, electric power and other industries to meet industrial environmental protection. and cleaner production requirements. [0003] The ePTFE membrane has a microscopic network structure of "microfiber-node". Air permeability is one of its important physical parameters, which determines the difficulty of dusty flue gas passing through the medium, and shows the transmission performance of...

Claims

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Application Information

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IPC IPC(8): B01D71/36B01D67/00
Inventor 严荣楼梁正海时志权项朝卫范凌云李淑晶何宏梁生宪施红勤徐涛刘金芝
Owner SINOMA SCI & TECH
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