A kind of preparation method of inorganic-organic functional polytetrafluoroethylene microporous membrane

Abstract

The invention discloses a preparation method of an inorganic-organic functional polytetrafluoroethylene microporous membrane, and in particular relates to the preparation method of the inorganic-organic functional polytetrafluoroethylene microporous membrane by in-situ synthesis of inorganic nanoparticles. The microporous membrane has flexibility, weather resistance and good adhesion characteristics of acrylate polymers, retains excellent chemical stability, corrosion resistance, oxidation resistance and other surface characteristics of fluoropolymers; the prepared inorganic nanoparticles are smaller in particle size and uniform in dispersion and free of particle agglomeration; control on the particle size and particle distribution of the method can be greatly improved; by adding of functional molecules, new application such as use as photocatalytic antibacterial materials, air filter materials or protective masks is given to the microporous membrane; on the other hand, by introducing of inorganic components in an organic matrix in a manner of an inorganic-organic hybrid membrane, the mechanical properties of the membrane can be enhanced, the thermal stability of the membrane can be improved, the pore structure and distribution of the membrane can be improved and modified, the solvent resistance of the membrane can be improved, and the separation properties of the membrane can be improved.

Description

technical field

[0001] The invention belongs to the field of preparation of functional polymer membrane materials, in particular to a preparation method of a functionalized polytetrafluoroethylene microporous membrane, in particular to a preparation method of an inorganic-organic functionalized polytetrafluoroethylene microporous membrane. Background technique

[0002] Functionalized polytetrafluoroethylene (PTFE) microporous membrane is prepared by host-guest assembly with PTFE microporous membrane as the main body and functional molecules as guests. The PTFE microporous membrane as the main body not only has excellent chemical stability, thermal stability, and electrical insulation, but also has excellent waterproof, windproof, moisture permeability, air permeability, and stable charge storage. A new type of membrane material with great application prospects. Functionalized molecules as guests are compounds with certain functional groups, such as catalysts, antibacterial ...

Examples

Embodiment 1

[0036] 1. Preparation of inorganic-organic functionalized polytetrafluoroethylene microporous membrane

[0037] (1) Preparation of composite emulsifier: dissolve 4.5 g of polyethylene glycol monomethyl ether methacrylate with an average molecular weight of 950, 0.1 g of bis(2-ethylhexyl) sodium sulfosuccinate in 1.5 g of ethanol, and Stir continuously until dissolved to obtain a clear and translucent compound emulsifier.

[0038] (2) Preparation of fluorine-containing copolymer microemulsion: the composite emulsifier prepared in step (1) was dissolved in 2 g of hexafluorobutyl acrylate, 11 g of methyl methacrylate and 0.4 g of ethylene glycol dimethacrylate In the oil phase composed of solids, stir continuously in a constant temperature water bath at 25°C until a uniform system is formed, control the rotation speed at 500r / min, add 300μL of ultrapure water dropwise with a 50μL pipette gun, and add dropwise in 6 times, and use a conductivity meter Continuously monitor the cond...

Embodiment 2

[0045] 1. Preparation of inorganic-organic functionalized polytetrafluoroethylene microporous membrane

[0046] (1) Preparation of composite emulsifier: dissolve 6 g of polyethylene glycol monomethyl ether methacrylate with an average molecular weight of 950, 0.3 g of bis(2-ethylhexyl) sodium sulfosuccinate in 2 g of isopropanol alcohol, and Stir continuously at room temperature until dissolved to obtain a clear and translucent complex emulsifier.

[0047] (2) Preparation of fluorine-containing copolymer microemulsion: dissolve the composite emulsifier prepared in step (1) in 2.5 g of hexafluorobutyl acrylate, 12.5 g of methyl methacrylate and 0.7 g of ethylene glycol dimethacrylate In the oil phase composed of g monomer, stir continuously in a constant temperature water bath at 25°C until a homogeneous system is formed, control the rotation speed at 500r / min, add 850μL of a freshly prepared 20% ammonia water solution dropwise with a 50μL pipette gun, and divide After 17 drop...

Embodiment 3

[0054] 1. Preparation of inorganic-organic functionalized polytetrafluoroethylene microporous membrane

[0055] (1) Preparation of composite emulsifier: dissolve 5 g of polyethylene glycol monomethyl ether methacrylate with an average molecular weight of 1500, 0.15 g of bis(2-ethylhexyl) sodium sulfosuccinate in 1.5 g of ethanol, and Stir continuously until dissolved to obtain a clear and translucent compound emulsifier.

[0056] (2) Preparation of fluorine-containing copolymer microemulsion: dissolve the composite emulsifier prepared in step (1) in 2.5 g of hexafluorobutyl acrylate, 10 g of methyl methacrylate and 0.4 g of ethylene glycol dimethacrylate In the oil phase composed of monomers, stir continuously in a constant temperature water bath at 25°C until a homogeneous system is formed, control the rotation speed at 500r / min, add 550μL of a freshly prepared aqueous ammonia solution with a mass fraction of 20% to it dropwise with a 50μL pipette gun, and divide 11 For each...

technical field

[0001] The invention belongs to the field of preparation of functional polymer membrane materials, in particular to a preparation method of a functionalized polytetrafluoroethylene microporous membrane, in particular to a preparation method of an inorganic-organic functionalized polytetrafluoroethylene microporous membrane. Background technique

[0002] Functionalized polytetrafluoroethylene (PTFE) microporous membrane is prepared by host-guest assembly with PTFE microporous membrane as the main body and functional molecules as guests. The PTFE microporous membrane as the main body not only has excellent chemical stability, thermal stability, and electrical insulation, but also has excellent waterproof, windproof, moisture permeability, air permeability, and stable charge storage. A new type of membrane material with great application prospects. Functionalized molecules as guests are compounds with certain functional groups, such as catalysts, antibacterial ...

Examples

Embodiment 1

[0036] 1. Preparation of inorganic-organic functionalized polytetrafluoroethylene microporous membrane

[0037] (1) Preparation of composite emulsifier: dissolve 4.5 g of polyethylene glycol monomethyl ether methacrylate with an average molecular weight of 950, 0.1 g of bis(2-ethylhexyl) sodium sulfosuccinate in 1.5 g of ethanol, and Stir continuously until dissolved to obtain a clear and translucent compound emulsifier.

[0038] (2) Preparation of fluorine-containing copolymer microemulsion: the composite emulsifier prepared in step (1) was dissolved in 2 g of hexafluorobutyl acrylate, 11 g of methyl methacrylate and 0.4 g of ethylene glycol dimethacrylate In the oil phase composed of solids, stir continuously in a constant temperature water bath at 25°C until a uniform system is formed, control the rotation speed at 500r / min, add 300μL of ultrapure water dropwise with a 50μL pipette gun, and add dropwise in 6 times, and use a conductivity meter Continuously monitor the cond...

Embodiment 2

[0045] 1. Preparation of inorganic-organic functionalized polytetrafluoroethylene microporous membrane

[0046] (1) Preparation of composite emulsifier: dissolve 6 g of polyethylene glycol monomethyl ether methacrylate with an average molecular weight of 950, 0.3 g of bis(2-ethylhexyl) sodium sulfosuccinate in 2 g of isopropanol alcohol, and Stir continuously at room temperature until dissolved to obtain a clear and translucent complex emulsifier.

[0047] (2) Preparation of fluorine-containing copolymer microemulsion: dissolve the composite emulsifier prepared in step (1) in 2.5 g of hexafluorobutyl acrylate, 12.5 g of methyl methacrylate and 0.7 g of ethylene glycol dimethacrylate In the oil phase composed of g monomer, stir continuously in a constant temperature water bath at 25°C until a homogeneous system is formed, control the rotation speed at 500r / min, add 850μL of a freshly prepared 20% ammonia water solution dropwise with a 50μL pipette gun, and divide After 17 drop...

Embodiment 3

[0054] 1. Preparation of inorganic-organic functionalized polytetrafluoroethylene microporous membrane

[0055] (1) Preparation of composite emulsifier: dissolve 5 g of polyethylene glycol monomethyl ether methacrylate with an average molecular weight of 1500, 0.15 g of bis(2-ethylhexyl) sodium sulfosuccinate in 1.5 g of ethanol, and Stir continuously until dissolved to obtain a clear and translucent compound emulsifier.

[0056] (2) Preparation of fluorine-containing copolymer microemulsion: dissolve the composite emulsifier prepared in step (1) in 2.5 g of hexafluorobutyl acrylate, 10 g of methyl methacrylate and 0.4 g of ethylene glycol dimethacrylate In the oil phase composed of monomers, stir continuously in a constant temperature water bath at 25°C until a homogeneous system is formed, control the rotation speed at 500r / min, add 550μL of a freshly prepared aqueous ammonia solution with a mass fraction of 20% to it dropwise with a 50μL pipette gun, and divide 11 For each...