Preparation method of polytetrafluoroethylene film with ultrahigh air permeability

Abstract

The invention discloses a preparation method of a polytetrafluoroethylene film with ultrahigh air permeability. The preparation method comprises the following steps: S1, material mixing; S2, curing; S3, blank pressing and pushing; S4, calendaring; S5, degreasing; S6, stretching treatment; and S7, heat setting; and the step S7 is carried out in an asymmetric heating oven, the two faces of a base film obtained in the step S6 are treated at different heat setting temperatures, the temperature difference of different heat setting treatment is 360-435 DEG C, and the heat setting treatment time is 10-60 s. The heat setting temperature of an upper heat setting heating area and the heat setting temperature of a lower heat setting heating area in the heat setting treatment are different, that is, the heat setting treatment is carried out on the biaxially oriented base film subjected to the stretching treatment in an asymmetric heating mode, and the prepared PTFE film extremely has the small average pore size of 0.1-0.22 [mu]m and the high air permeability of 20-35 m < 3 > / (m < 2 >. h). The PTFE thin film material prepared by the method has the characteristics of small pore size, low thermal shrinking rate,high porosity and high flux. A prepared microporous film can be widely applied to the fields of medicine sterilization, fermentation sterilization, membrane distillation, membrane aeration and the like.

Description

technical field

[0001] The invention relates to the field of preparation of polytetrafluoroethylene film materials, in particular to a preparation method of a polytetrafluoroethylene film with ultra-high air permeability. Background technique

[0002] Polytetrafluoroethylene (PTFE) film material has strong high and low temperature resistance, hydrophobicity, non-stickiness, self-lubrication, corrosion resistance and friction resistance, and is widely used in clothing, medical, electronics and other fields, including clothing. Membranes, bubble point membranes and filter media, etc.

[0003] The tiny pore size formed during the preparation process of PTFE membrane material and its own hydrophobic properties make the PTFE membrane material have higher waterproof performance; Better breathability. But, inventor finds in actual production, if will obtain higher air permeability PTFE membrane material, just need to expand aperture appropriately, will certainly influence the fil...

Examples

Embodiment 1

[0039] The schematic diagram of the asymmetrical heating oven of the present invention is as figure 1 shown by figure 1As shown, the asymmetric heating oven includes an upper heat-setting heating zone I and a lower heat-setting heating zone II arranged on both sides 1 of the biaxially stretched base film, which are used to blow heat into the asymmetric heating oven. The upper tuyere 2 and the lower tuyeres 3 that enter the hot air, the first clamping device 6 and the second clamping device 7 that are respectively arranged at the film inlet 4 and the film outlet 5, and symmetrically arranged on the two-way stretching base Temperature probes on both sides of the membrane8.

[0040] The temperature probe point 8 is set between the first clamping device and the second clamping device, and the temperature probe point is close to the first clamping device or the second clamping device The distance between the temperature probes is 15 cm, the distance between the temperature probe ...

Embodiment 2

[0053] The distance between the temperature probe point and the first clamping device or the second clamping device is 16 cm, and the distance between the temperature probe point and the surface of the biaxially stretched base film is 3.3 mm , the number of temperature probe points is 4.

[0054] The upper tuyeres and the lower tuyeres are respectively arranged in the upper heat-setting heating zone and the lower heat-setting heating zone, and the upper tuyeres and the lower tuyeres are connected with the biaxially stretched base film. The distance between the two sides is 8cm.

[0055] A preparation method of a polytetrafluoroethylene film with ultra-high air permeability, comprising the steps of:

[0056] S1 compounding: polytetrafluoroethylene dispersion resin and extrusion aid are carried out raw material mixing; In the present embodiment, extrusion aid is preferably kerosene, and consumption is 20% of polytetrafluoroethylene dispersion resin quality, and polytetrafluoroe...

Embodiment 3

[0066] The distance between the temperature probe point and the first clamping device or the second clamping device is 15 cm, and the distance between the temperature probe point and the surface of the biaxially stretched base film is 3 mm , the number of temperature probe points is 6.

[0067] The upper tuyeres and the lower tuyeres are respectively arranged in the upper heat-setting heating zone and the lower heat-setting heating zone, and the upper tuyeres and the lower tuyeres are connected with the biaxially stretched base film. The distance between the two sides is 10cm.

[0068] A preparation method of a polytetrafluoroethylene film with ultra-high air permeability, comprising the steps of:

[0069] S1 compounding: polytetrafluoroethylene dispersion resin and extrusion aid are carried out raw material mixing; In the present embodiment, extrusion aid is preferably kerosene, and consumption is 30% of polytetrafluoroethylene dispersion resin quality, polytetrafluoroethyle...

technical field

[0001] The invention relates to the field of preparation of polytetrafluoroethylene film materials, in particular to a preparation method of a polytetrafluoroethylene film with ultra-high air permeability. Background technique

[0002] Polytetrafluoroethylene (PTFE) film material has strong high and low temperature resistance, hydrophobicity, non-stickiness, self-lubrication, corrosion resistance and friction resistance, and is widely used in clothing, medical, electronics and other fields, including clothing. Membranes, bubble point membranes and filter media, etc.

[0003] The tiny pore size formed during the preparation process of PTFE membrane material and its own hydrophobic properties make the PTFE membrane material have higher waterproof performance; Better breathability. But, inventor finds in actual production, if will obtain higher air permeability PTFE membrane material, just need to expand aperture appropriately, will certainly influence the fil...

Examples

Embodiment 1

[0039] The schematic diagram of the asymmetrical heating oven of the present invention is as figure 1 shown by figure 1As shown, the asymmetric heating oven includes an upper heat-setting heating zone I and a lower heat-setting heating zone II arranged on both sides 1 of the biaxially stretched base film, which are used to blow heat into the asymmetric heating oven. The upper tuyere 2 and the lower tuyeres 3 that enter the hot air, the first clamping device 6 and the second clamping device 7 that are respectively arranged at the film inlet 4 and the film outlet 5, and symmetrically arranged on the two-way stretching base Temperature probes on both sides of the membrane8.

[0040] The temperature probe point 8 is set between the first clamping device and the second clamping device, and the temperature probe point is close to the first clamping device or the second clamping device The distance between the temperature probes is 15 cm, the distance between the temperature probe ...

Embodiment 2

[0053] The distance between the temperature probe point and the first clamping device or the second clamping device is 16 cm, and the distance between the temperature probe point and the surface of the biaxially stretched base film is 3.3 mm , the number of temperature probe points is 4.

[0054] The upper tuyeres and the lower tuyeres are respectively arranged in the upper heat-setting heating zone and the lower heat-setting heating zone, and the upper tuyeres and the lower tuyeres are connected with the biaxially stretched base film. The distance between the two sides is 8cm.

[0055] A preparation method of a polytetrafluoroethylene film with ultra-high air permeability, comprising the steps of:

[0056] S1 compounding: polytetrafluoroethylene dispersion resin and extrusion aid are carried out raw material mixing; In the present embodiment, extrusion aid is preferably kerosene, and consumption is 20% of polytetrafluoroethylene dispersion resin quality, and polytetrafluoroe...

Embodiment 3

[0066] The distance between the temperature probe point and the first clamping device or the second clamping device is 15 cm, and the distance between the temperature probe point and the surface of the biaxially stretched base film is 3 mm , the number of temperature probe points is 6.

[0067] The upper tuyeres and the lower tuyeres are respectively arranged in the upper heat-setting heating zone and the lower heat-setting heating zone, and the upper tuyeres and the lower tuyeres are connected with the biaxially stretched base film. The distance between the two sides is 10cm.

[0068] A preparation method of a polytetrafluoroethylene film with ultra-high air permeability, comprising the steps of:

[0069] S1 compounding: polytetrafluoroethylene dispersion resin and extrusion aid are carried out raw material mixing; In the present embodiment, extrusion aid is preferably kerosene, and consumption is 30% of polytetrafluoroethylene dispersion resin quality, polytetrafluoroethyle...

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