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

Porous film and method for preparation thereof

A porous membrane and resin technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of unfavorable cost and complicated process

Inactive Publication Date: 2007-02-14
NITTO DENKO CORP
View PDF5 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method of cross-linking and polymerizing a hydrophilic substance has problems such as complicated steps and disadvantages in cost.

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
  • Porous film and method for preparation thereof
  • Porous film and method for preparation thereof
  • Porous film and method for preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] 6 parts by weight of organic clay (SPN manufactured by Copp Chemical Co., Ltd.) obtained by organicizing inorganic phyllosilicate with an alkylene oxide compound was added to 64 parts by weight of diethyl phthalate, and ultrasonic waves were applied. While stirring with a stirring blade at a speed of 3000 rpm at room temperature for 4 hours, it was dispersed. Next, 30 parts by weight of polyvinylidene fluoride (manufactured by Solbey Co., Ltd., SOLEF6020) was added, and kneaded at 180° C. at a rotation speed of 50 rpm for 15 minutes. After kneading, it is cooled to room temperature to make a film-making stock solution. Next, heat the prepared film-making stock solution to 180°C to melt it evenly again, press it into a flat film with a thickness of 200 μm, and then put it into a water bath at 5°C for cooling to make a porous film. plasma membrane. The average pore diameter of this porous membrane was 0.1 μm, and the porosity was 64%.

Embodiment 2

[0068]The mixing ratio of the film-making stock solution was adjusted to 2 parts by weight of organic clay, 58 parts by weight of diethyl phthalate, and 40 parts by weight of polyvinylidene fluoride, except that the same operation as in Example 1 was carried out to prepare Porous membrane. The average pore diameter of this porous membrane was 0.1 μm, and the porosity was 65%.

Embodiment 3

[0074] 1.5 parts by weight of organic clay (SPN manufactured by Copp Chemical Co., Ltd.) obtained by organicizing inorganic layered silicate with an alkylene oxide compound, 68.5 parts by weight of diethyl phthalate, and 30 parts by weight of polyvinylidene fluoride Parts were mixed according to the method in Example 1 to obtain a membrane-forming stock solution. Raise the temperature of the film-making stock solution to 180°C again, use diethyl phthalate at 180°C as the core liquid, and extrude it through a double ring die at an extrusion speed of 0.2m / min until the temperature is adjusted to 5°C A hollow porous membrane having an outer diameter of 1.0 mm and an inner diameter of 0.7 mm was obtained in a cooling water tank. The height from the die to the cooling water tank is 2 cm. The average pore diameter of this porous membrane was 0.1 μm, and the porosity was 65%.

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
particle sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
Login to View More

Abstract

A method for preparing a porous film wherein a porous film of a poly(vinylidene fluoride) based resin is prepared by dissolving the poly(vinylidene fluoride) based resin in a poor solvent through heating, to form a liquid raw material for a film, and then cooling the liquid raw material, to bring about a phase separation, characterized in that an organized clay being organized by a hydrophilic compound is dispersed in the above liquid raw material for a film in an amount of 1 to 25 parts by weight relative to 100 parts by weight of the poly(vinylidene fluoride) based resin; and a porous film prepared by the method. The above method allows the preparation of a porous film of a poly(vinylidene fluoride) based resin which has a microstructure providing a satisfactory mechanical strength and permeation performance capabilities and is improved in hydrophilic property, without the precise control of temperature before the above cooling.

Description

technical field [0001] The present invention relates to a porous film of a polyvinylidene fluoride resin produced by a so-called thermally induced phase separation method (TIPS method) and a method for producing the same. Background technique [0002] Membrane separation can be used for various purposes such as separation, purification, concentration, and classification of substances. It occupies a certain position as an important unit operation. Instead of a single operation of membrane filtration. Currently, ultrafiltration membranes (UF) and microfiltration membranes (MF) are used to purify river water and lake water, etc., and their demand and market tend to increase mainly in China and the Middle East, where water supply problems exist. [0003] However, separation membranes currently have a problem in that durability is required for backwashing (backwashing) or chemical reagent washing (reagent washing) of UF membranes or MF membranes used for long-term operation. Th...

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): C08J9/28C08L27/16B01D71/34C08J9/26
CPCY10T428/24999C08J2327/16C08J5/18
Inventor 田原伸治富康博松山秀人
Owner NITTO DENKO CORP