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Base band winding device as well as polytetrafluoroethylene microporous membrane and preparation method thereof

A technology of polytetrafluoroethylene and winding device, which is applied in the direction of chemical instruments and methods, membrane technology, flat products, etc., and can solve problems such as poor performance

Active Publication Date: 2021-08-06
FUDAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polytetrafluoroethylene microporous membrane obtained by this method tends to be thick in the middle and thin on both sides, which leads to poor performance.

Method used

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  • Base band winding device as well as polytetrafluoroethylene microporous membrane and preparation method thereof
  • Base band winding device as well as polytetrafluoroethylene microporous membrane and preparation method thereof
  • Base band winding device as well as polytetrafluoroethylene microporous membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] The preparation method of polytetrafluoroethylene microporous membrane in the present embodiment is:

[0090] (1) Longitudinal stretching: the polytetrafluoroethylene base tape with a thickness of 100 μm was stretched longitudinally in an oven at 300° C. to obtain a degreased base tape.

[0091] (2) Winding: the degreased base tape obtained in step (1) is wound on an olive-shaped base tape winding device 10 to obtain a wound base tape. Wherein, in the base tape winding device 10 , the included angle between the generatrix of the winding roller 100 and the axis is 30°. The first included angle of the rolled lines in the first direction in the rolled line area 130 is 15°, and the second included angle of the rolled lines in the second direction is 15°.

[0092] (3) Stand still and keep warm: put the winding base tape obtained in step (2) into an oven to stand still, and perform heat preservation treatment to obtain a pre-stretched base tape. Specifically, keep the tempe...

Embodiment 2

[0097] The preparation method of polytetrafluoroethylene microporous membrane in the present embodiment is:

[0098] (1) Longitudinal stretching: the polytetrafluoroethylene base tape with a thickness of 100 μm was stretched longitudinally in an oven at 300° C. to obtain a degreased base tape.

[0099] (2) Winding: the degreased base tape obtained in step (2) is wound on an olive-shaped base tape winding device 10 to obtain a wound base tape. Wherein, in the base tape winding device 10 , the included angle between the generatrix of the winding roller 100 and the axis is 30°. The first included angle of the rolled lines in the first direction in the rolled line area 130 is 85°, and the second included angle of the rolled lines in the second direction is 85°.

[0100] (3) Stand still and keep warm: put the winding base tape obtained in step (3) into an oven to stand still, and perform heat preservation treatment to obtain a pre-stretched base tape. Specifically, keep the tempe...

Embodiment 3

[0105] The preparation method of polytetrafluoroethylene microporous membrane in the present embodiment is:

[0106] (1) Longitudinal stretching: The polytetrafluoroethylene base tape with a thickness of 100 μm was stretched longitudinally in an oven at 300° C. to obtain a degreased base tape.

[0107] (2) Winding: the degreased base tape obtained in step (1) is wound on an olive-shaped base tape winding device 10 to obtain a wound base tape. Wherein, in the base tape winding device 10 , the included angle between the generatrix of the winding roller 100 and the axis is 15°. The first included angle of the rolled lines in the first direction in the rolled line area 130 is 50°, and the second included angle of the rolled lines in the second direction is 50°.

[0108] (3) Stand still and keep warm: put the winding base tape obtained in step (2) into an oven to stand still, and perform heat preservation treatment to obtain a pre-stretched base tape. Specifically, at a temperatu...

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Abstract

The invention relates to a base band winding device as well as a polytetrafluoroethylene microporous membrane and a preparation method thereof. The preparation method comprises the following steps that longitudinal stretching treatment is conducted on a polytetrafluoroethylene base band to obtain a degreased base band, the degreased base band is wound around the base band winding device to obtain a wound base band, standing heat preservation and transverse stretching are conducted on the wound base band, and finally shaping treatment is conducted to obtain the polytetrafluoroethylene microporous membrane. Due to the fact that the middle of the base band winding device is large and the two ends of the base band winding device are small, the method can avoid the problem that in a transverse stretching process, due to the fact that stretching force borne by a middle area and stretching force borne by an edge area are different, the transverse local thickness is not uniform.

Description

technical field [0001] The invention relates to the technical field of polytetrafluoroethylene materials, in particular to a base tape winding device, a polytetrafluoroethylene microporous membrane and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) dispersion resin is a white, soft and sticky powdery plastic material, because of its excellent weather resistance, corrosion resistance, insulation, aging resistance, non-toxic, Features such as fibrosis, known as the "King of Plastics". [0003] PTFE microporous membrane made of PTFE, also known as PTFE microporous membrane (expanded PTFE, e-PTFE) is widely used in artificial blood vessels, heart repair membranes, separation and filtration membranes, sealing, electrical Insulation, field supplies, etc. PTFE microporous membrane has good biocompatibility and unique microporous structure, non-toxic, non-carcinogenic, non-sensitizing and other side effects. Moreover, because the PTFE m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C69/00B29C55/14B29C67/04B65H75/10B01D67/00B01D71/36B29L7/00B29L31/14
CPCB29C69/00B29C55/143B29C67/04B01D71/36B01D67/0027B65H75/10B29L2007/00B29L2031/14
Inventor 丁建东王刚
Owner FUDAN UNIV
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