Formula for preparing fluorocopolymer porous membranes and method for preparing porous membranes according to formula

A technology of copolymer and porous membrane is applied in the field of membrane preparation of fluorine-containing copolymer porous membrane and the preparation of porous membrane by using the formula, which can solve the problems of reducing production efficiency, fluoride is easy to corrode equipment, increasing cost, etc., and achieves saving Energy, high porosity, effect of reducing film formation temperature

Active Publication Date: 2015-05-13
苏州孝义家光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The film-forming system of the above method needs to be maintained at a temperature higher than 250°C to maintain uniformity, while the applicable temperature required by the mechanical properties of ECTFE is up to 175°C, and the best operating temperature is 150°C. ECTFE will be partially decomposed when exposed to higher temperatures for a long time , the decomposition product of fluoride is easy to corrode equipment, reduce production efficiency and increase cost

Method used

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  • Formula for preparing fluorocopolymer porous membranes and method for preparing porous membranes according to formula
  • Formula for preparing fluorocopolymer porous membranes and method for preparing porous membranes according to formula
  • Formula for preparing fluorocopolymer porous membranes and method for preparing porous membranes according to formula

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Table 1 provides the membrane formulations of 6 kinds of fluorine-containing copolymer porous membranes,

[0043] Table 1

[0044]

Ethylene-chlorotrifluoroethylene copolymer

Thinner: di-isooctyl adipate

1#

20wt%

80wt%

2#

30wt%

70wt%

3#

40wt%

60wt%

4#

50wt%

50wt%

5#

12wt%

85wt%

6#

20wt%

80wt%

[0045] Note: Ethylene-chlorotrifluoroethylene copolymer is made by Shanghai Solvay 902.

[0046] The first fluorine-containing copolymer flat porous membrane was prepared according to the following steps by using the above four membrane-making formulas 1 to 4#:

[0047] 1) According to the formula, ethylene-chlorotrifluoroethylene copolymer and diisooctyl adipate are mixed evenly in proportion to form a viscous mixture;

[0048]2) Preheat the mold of the hot press at 180°C. The mold is a groove with a thickness of 200 μm formed on opposite sides of a pair of stai...

Embodiment 2

[0057] The film-making formulas of two kinds of fluorine-containing copolymer porous membranes are given in Table 2,

[0058] Table 2

[0059]

[0060] Note: Ethylene-chlorotrifluoroethylene copolymer is made by Shanghai Solvay 902.

[0061] The first kind of fluorine-containing copolymer flat porous membrane was prepared according to the following steps by using the above two membrane-making formulas of 7# and 8#:

[0062] 1) According to the formula, ethylene-chlorotrifluoroethylene copolymer, diisooctyl adipate and diethyl phthalate are mixed evenly in proportion to form a viscous mixture;

[0063] 2) Preheat the mold of the hot press at 180°C. The mold is a groove with a thickness of 200 μm formed on opposite sides of a pair of stainless steel plates. When the temperature of the mold is constant, pour the viscous mixture into it, and wait for the After the viscous mixture is completely melted into a homogeneous phase, it is pressed under a pressure of 15 MPa to obta...

Embodiment 3

[0067] The film-making formulas of two kinds of fluorine-containing copolymer porous membranes are given in Table 3,

[0068] table 3

[0069]

[0070] Note: Ethylene-chlorotrifluoroethylene copolymer is made by Shanghai Solvay 902.

[0071] Use the above two membrane-making formulas of 9# and 10# to prepare the first flat porous membrane of fluorine-containing copolymer according to the following steps:

[0072] 1) According to the formula, ethylene-chlorotrifluoroethylene copolymer, diisooctyl adipate and silicon dioxide are mixed evenly in proportion to form a viscous mixture;

[0073] 2) Preheat the mold of the hot press at 180°C. The mold is a groove with a thickness of 200 μm formed on opposite sides of a pair of stainless steel plates. When the temperature of the mold is constant, pour the viscous mixture into it, and wait for the After the viscous mixture is completely melted into a homogeneous phase, it is pressed under a pressure of 15 MPa to obtain the first ...

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Abstract

The invention discloses a formula for preparing fluorocopolymer porous membranes. The formula comprises the following ingredients: 15-50wt% of ethylene-chlorotrifluoroethylene copolymer, 30-85wt% of diluent and 0-20wt% of composite pore-forming agent, wherein the sum of the ingredients is 100wt%; the diluent is any one or a mixture of several of diisooctyl adipate or diisooctyl adipate and dibutyl phthalate, diethyl phthalate and dioctyl phthalate in any ratio. The invention further discloses a method for preparing fluorocopolymer flat porous membranes and fluorocopolymer hollow fiber porous membranes according to the formula. According to the invention, the membrane preparing formula can reduce the membrane preparing temperature to below 200 DEG C; the process is simple; the finally prepared membranes is good in mechanical properties, high in porosity and good in permeability, and can be used for membrane separation under severe conditions of acid-alkali media, organic solvents and the like.

Description

technical field [0001] The invention relates to the technical field of membranes, in particular to a membrane-making formulation of a fluorine-containing copolymer porous membrane and a method for preparing the porous membrane using the formulation. Background technique [0002] Ethylene-chlorotrifluoroethylene copolymer, referred to as ECTFE, is a semi-crystalline, thermoplastic polymer with good machinability, excellent heat resistance, chemical resistance and weather resistance; its resistance to chemical reagents and polytetrafluoroethylene Ethylene is equivalent and better than polyvinylidene fluoride, and none of the existing solvents can dissolve ECTFE at a temperature lower than 120°C. Because ECTFE has excellent corrosion resistance, outstanding impact resistance and fairly tough mechanical strength, it is widely used in the preparation of wire and cable, filter casings, etc. ECTFE is suitable for special environments such as high temperature and high corrosion, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/32B01D71/26B01D69/08B01D69/06B01D67/00
CPCB01D67/002B01D67/003B01D69/08B01D69/087B01D71/32B01D71/76B01D2323/18B29C43/003B29K2023/08B29K2105/12B29L2031/755B29K2995/0068B29C43/02B29C43/52
Inventor 肖长发潘健黄庆林刘海亮
Owner 苏州孝义家光电科技有限公司
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