Preparation method of PVDF-PAA (polyvinylidene fluoride-polyacrylic acid) block copolymer

A polyvinylidene fluoride and block copolymer technology, which is applied in the field of preparation of polyvinylidene fluoride-polyacrylic acid block copolymers, can solve the problems of few reports on block copolymers, and can improve the polymerization reaction rate and improve the Stain resistance, improved hydrophilicity

Active Publication Date: 2015-05-13
JUHUA GROUP TECH CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PVDF block copolymers are mainly prepared by step-by-step living radical polymerization. Although there have been research reports on block copolymers of PVDF and polystyrene, PVDF and poly(meth)acrylates, but about PVDF and hydroph

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1

[0023] In a 5L reaction kettle, add 2000 ml of water, 5.0g of ammonium perfluorooctanoate, 20.0g of n-hexadecanol, 15.2g of ICF 2 CF 2 I, 3.2g of VA-044, pass through N 2 row O 2 To the content below 5ppm, stir at high speed for 10min at 5℃ to obtain a fine emulsion; heat up to 45 o C, feed VDF monomer to the pressure of 3.0 MPa in the kettle, and start the polymerization. When the pressure in the autoclave dropped by 0.1 MPa, the VDF monomer was supplemented until the pressure in the autoclave was 3.0 MPa, and the operation was repeated. When the cumulative monomer pressure drop reaches 4.0MPa, stop supplementing the VDF monomer, continue to polymerize until the pressure drops to 1.5MPa, cool to room temperature to complete the polymerization, remove the unreacted VDF monomer, and obtain an active PVDF seed emulsion.

[0024] 40g of acrylonitrile was added to the kettle, stirred and dispersed at room temperature, and swelled for 2h. The temperature ...

Example Embodiment

[0027] Example 2

[0028] In a 5L reactor, add 2000 ml of water, 5.0g of ammonium perfluorooctanoate, 10.0g of n-hexadecane, 58g of C 6 F1 3 I, 3.2g of VA-044, pass through N 2 row O 2 When the content is lower than 5ppm, stir at a high speed for 10min at 5℃ to obtain a fine emulsion; heat up to 50 o C, feed VDF monomer to the pressure of 3.0 MPa in the kettle, and start the polymerization. When the pressure in the autoclave dropped by 0.1 MPa, the VDF monomer was supplemented until the pressure in the autoclave was 3.0 MPa, and the operation was repeated. When the cumulative monomer pressure drop reaches 6.3MPa, stop supplementing VDF monomer, continue to polymerize until the pressure drops to 1.5MPa, cool to room temperature to complete the polymerization, remove unreacted VDF monomer, and obtain active PVDF seed emulsion.

[0029] Add 200 g of acrylonitrile to the kettle, stir and disperse at room temperature, and swell for 5h. The temperature was raised to 50 °C an...

Example Embodiment

[0032] Example 3

[0033] In a 5L reactor, add 2000 ml of water, 8.0g of ammonium perfluorooctanoate, 15.0g of n-hexadecane, 29.0g of C 4 F 9 APS of I, 4.0g, pass through N 2 row O 2 When the content is lower than 5ppm, stir at a high speed for 10min at 5℃ to obtain a fine emulsion; heat up to 80 o C, feed VDF monomer to the pressure of 3.0 MPa in the kettle, and start the polymerization. When the pressure in the kettle dropped by 1.0 MPa, the VDF monomer was supplemented until the pressure in the kettle was 3.0 MPa, and the operation was repeated. When the cumulative monomer pressure drop reaches 5.8MPa, stop supplementing VDF monomer, continue to polymerize until the pressure drops to 1.5MPa, cool to room temperature to complete the polymerization, remove unreacted VDF monomer, and obtain active PVDF seed emulsion.

[0034] Add 100 g of acrylonitrile to the kettle, stir and disperse at room temperature, and swell for 2h. The temperature was raised to 80 °C and the re...

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PUM

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Abstract

The invention discloses a preparation method of a PVDF-PAA (polyvinylidene fluoride-polyacrylic acid) block copolymer. The method comprises steps as follows: firstly, preparing a PVDF seed emulsion through iodine transfer active free-radical miniemulsion polymerization, then adding acrylonitrile monomers to continue polymerization to obtain a PVDF-PAN (polyacrylonitrile) block copolymer, and finally, hydrolyzing the PVDF-PAN block copolymer under an alkaline condition to obtain the PVDF-PAA block copolymer. The method is simple in process, the molecular weight of PVDF and PAA blocks as well as components of the block copolymer are convenient to control, and the prepared PVDF-PAA block copolymer can be applied to preparation of porous PVDF membranes with excellent stain resistance and stable membrane flux for sewage treatment.

Description

technical field [0001] The invention belongs to the field of chemical engineering and technology, in particular to a preparation method of polyvinylidene fluoride-polyacrylic acid block copolymer. Background technique [0002] Polyvinylidene fluoride (PVDF) is a thermoplastic fluoropolymer, and its output is second only to polytetrafluoroethylene and ranks second in fluoropolymers. The fluorine content of PVDF is as high as 59wt%. Due to the strong electronegativity of fluorine atoms, the small atomic radius (1.32?), the large C-F bond energy (485KJ / mol), and the symmetrical substitution distribution of fluorine atoms, PVDF is semi-crystalline and heat-resistant. , Excellent weather resistance and chemical corrosion resistance, hydrophobic and oleophobic, low surface energy, small dielectric constant and so on. Therefore, PVDF is widely used in construction, aerospace, electronics, chemical industry, environmental protection, new energy and other industries. [0003] Memb...

Claims

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Application Information

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IPC IPC(8): C08F293/00C08F220/44C08F8/12C08F2/28
Inventor 包永忠黄志辉付铁柱汪星平余晓斌郑明华王树华
Owner JUHUA GROUP TECH CENT
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