Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparing method of polyvinylidene fluoride porous membrane

The technology of polyvinylidene fluoride and polyvinylidene fluoride resin is applied in the field of preparation of polyvinylidene fluoride porous membrane, and the effect of simple process is achieved.

Inactive Publication Date: 2013-02-06
GUANGDONG UNIV OF TECH
View PDF5 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of thermally induced phase separation to prepare microporous membranes, it is inevitable to use a large amount of diluents and extractants, which also brings environmental and safety issues.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparing method of polyvinylidene fluoride porous membrane
  • Preparing method of polyvinylidene fluoride porous membrane
  • Preparing method of polyvinylidene fluoride porous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Polyvinylidene fluoride resin with a melt index of 0.8 g / 10 min was melt-extruded at 240° C., and cast on an extrusion caster to form a film. The casting roll temperature is 90°C, and the melt draw ratio is 35. Then the initial film was heat-treated at 120° C. for 30 minutes to obtain a heat-treated film. Then stretch the heat-treated film at 30°C at a stretching rate of 30mm / min, and stretch it to a deformation of 20%, and at 130°C, at the same stretching rate, further stretch the heat-treated film to 50% deformation. Finally, it was heat-set at 140° C. for 30 minutes to obtain a polyvinylidene fluoride porous membrane.

Embodiment 2

[0025] Polyvinylidene fluoride resin with a melt index of 0.8 g / 10 min was melt-extruded at 240° C., and cast on an extrusion caster to form a film. The casting roll temperature is 100° C., and the melt draw ratio is 40. Then the initial film was heat-treated at 130° C. for 40 minutes to obtain a heat-treated film. Then stretch the heat-treated film at 35°C at a stretching rate of 40mm / min, and stretch it to a deformation of 25%, and at 135°C, at the same stretching rate, further stretch the heat-treated film to 55% deformation. Finally, it was heat-set at 145° C. for 30 minutes to obtain a polyvinylidene fluoride porous membrane.

Embodiment 3

[0027] Polyvinylidene fluoride resin with a melt index of 0.8 g / 10 min was melt-extruded at 210° C., and cast on an extrusion caster to form a film. The casting roll temperature is 110° C., and the melt draw ratio is 50. Then the initial film was heat-treated at 140° C. for 30 minutes to obtain a heat-treated film. Then stretch the heat-treated film at 40°C at a stretching rate of 50mm / min, and stretch it to a deformation of 20%, and at 140°C, at the same stretching rate, further stretch the heat-treated film to 55% deformation. Finally, it was heat-set at 140° C. for 45 minutes to obtain a polyvinylidene fluoride porous membrane.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
melt flow indexaaaaaaaaaa
melt flow indexaaaaaaaaaa
melt flow indexaaaaaaaaaa
Login to View More

Abstract

The invention provides a preparing method of a polyvinylidene fluoride porous membrane, wherein an extrusion casting-stretching method is adopted. The preparing method includes the following steps: polyvinylidene fluoride casting-stretching melt is stretched and subjected to thermal treatment, and then a melt stretching membrane is subjected to cold drawing and hot drawing to form a porous structure. Compared with the melt phase conversion and thermal induced phase separation method adopted by the exiting polyvinylidene fluoride porous membrane preparing method, no any auxiliaries or solvents are needed to be added in the production process by adopting the casting-stretching method, and the preparing method of the polyvinylidene fluoride porous membrane has the advantages of being safe, environment-friendly, simple in process, continuous in production and the like.

Description

technical field [0001] The invention relates to a preparation method of polyvinylidene fluoride porous membrane. Background technique [0002] Polyvinylidene fluoride (PVDF) porous membrane has been widely used in organic matter / water separation, industrial sewage treatment, drinking water purification due to its good electrolyte wettability, good chemical stability, heat resistance, weather resistance and biological erosion resistance. , polymer electrolyte, vanadium battery diaphragm and other fields. [0003] At present, the preparation methods of polyvinylidene fluoride porous membrane mainly include solution phase transition method and thermally induced phase separation method. Among them, the basic process of solution phase transition method preparation includes: first mix polyvinylidene fluoride resin and polar solvent to prepare a uniform solution, then immerse the polymer solution in a non-solvent coagulation bath such as water, alcohol and ketone, pass the polymer...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00
Inventor 雷彩红徐运祺胡冰吴术球徐睿杰
Owner GUANGDONG UNIV OF TECH