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Preparation method of vinylidene chloride polymer base mesopore-micropore composite porous charcoal

A vinylidene chloride, polymer technology, applied in the field of chemical engineering

Inactive Publication Date: 2012-02-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low recombination rate of nano-silica particles and resin particles, only micropores with a mesoporosity of about 50% can be obtained when a large amount of silica is used (such as silica: VDC-VC copolymer resin mass ratio of 10:1). Mesoporous composite porous carbon, causing waste of silica

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add a nonylphenol polyoxyethylene ether emulsifier aqueous solution to the nano-silica aqueous dispersion with an average particle size of primary particles of 15 nm, and stir at 50°C for 1 hour to obtain a nano-silica mass fraction of 3%, nonylphenol polyoxyethylene Aqueous dispersion of modified nano silicon oxide with ether mass fraction of 0.25%.

[0026] Add 200 grams of modified nano-silica aqueous dispersion into the reaction kettle, stir, heat up to 50°C, add 0.5 grams of ammonium persulfate and 0.5 grams of sodium bisulfite, dropwise add 95 grams of vinylidene chloride and 5 grams of acrylic acid Composed of mixed monomers, control the dropping rate to keep the pressure of the polymerization system basically constant, add 1.0 grams of sodium lauryl sulfate after the monomers are added dropwise, continue to react until the system pressure drops by 0.1MPa to end the polymerization, separate and dry to obtain Vinylidene chloride polymer / nano-silica composites.

...

Embodiment 2

[0030] Add a nonylphenol polyoxyethylene ether emulsifier aqueous solution to the nano-silica aqueous dispersion with an average particle size of primary particles of 15 nm, and stir at 50°C for 1 hour to obtain a nano-silica mass fraction of 7.5%, nonylphenol polyoxyethylene Aqueous dispersion of modified nano silicon oxide with ether mass fraction of 0.625%.

[0031] Add 200 grams of modified nano-silica aqueous dispersion into the reaction kettle, stir, heat up to 50 ° C, add 0.5 grams of ammonium persulfate and 0.5 grams of sodium bisulfite, dropwise add 92 grams of vinylidene chloride and 8 grams of clothing Mixed monomers composed of conic acid, control the rate of addition to maintain the pressure of the polymerization system is basically constant, add 1.2 grams of sodium lauryl sulfate after the addition of the monomers, and continue to react until the system pressure drops by 0.1MPa to end the polymerization, separation, Dry to obtain the vinylidene chloride polymer / n...

Embodiment 3

[0035] Add a nonylphenol polyoxyethylene ether emulsifier aqueous solution to the nano-silica aqueous dispersion with an average particle size of primary particles of 15 nm, and stir at 50°C for 1 hour to obtain a nonylphenol polyoxyethylene with a mass fraction of nano-silica of 15%. Aqueous dispersion of modified nano silicon oxide with ether mass fraction of 1.0%.

[0036] Add 200 grams of modified nano-silica aqueous dispersion into the reaction kettle, stir, heat up to 50 ° C, add 0.5 grams of ammonium persulfate and 0.5 grams of sodium bisulfite, dropwise add 90 grams of vinylidene chloride and 10 grams of formazan Mixed monomers composed of acrylic acid based, control the rate of addition to maintain the pressure of the polymerization system is basically constant, add 2.0 grams of sodium lauryl sulfate after the addition of the monomers, continue to react until the system pressure drops by 0.08MPa to end the polymerization, separation, Dry to obtain the vinylidene chlor...

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Abstract

The invention discloses a preparation method of vinylidene chloride polymer base mesopore-micropore composite porous charcoal. The method comprises steps of: (1) adding a polyoxyethylene nonyl phenyl ether emulsifier in a nano silicon oxide aqueous dispersion, heating with stirring to reach adsorption balance and obtaining a modified nano silicon oxide aqueous dispersion; (2) adding the modified nano silicon oxide aqueous dispersion and an initiation system into a reaction kettle, heating, adding a mixture of vinylidene chloride and a second monomer and an anion emulsifier drop by drop, and carrying out in situ emulsion polymerization to obtain vinylidene chloride polymer / nano silicon oxide composite particles; (3) charring the vinylidene chloride polymer / nano silicon oxide composite particles at high temperature to obtain a charcoal / nano silicon oxide compound; (4) etching to remove nano silicon oxide in the charcoal / nano silicon oxide compound to prepare the mesopore-micropore composite porous charcoal. The porous charcoal prepared by the method of the invention has mesopore and micropore structures; the mesopores have narrow aperture distribution, large specific surfacearea and large pore volume. Therefore, the porous charcoal has promising application prospect in fields of new energy, environmental protection and industrial catalysis, etc.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a preparation method of vinylidene chloride polymer-based mesopore-micropore composite porous carbon. [0002] Background technique [0003] Porous carbon materials are widely used in many fields such as environmental protection, medicine, and new energy. According to the pore size of porous carbon, the International Union of Pure and Applied Chemistry (IUPAC) divides porous carbon into microporous carbon (pore size less than 2nm), mesoporous carbon (2~50nm) and macroporous carbon (>50nm). At present, the porous carbons produced and applied industrially are mainly microporous carbons. Due to the small pore size of microporous carbon, it cannot be used for the adsorption and separation of large-scale pollutants (such as biological and synthetic macromolecular substances); when used as a supercapacitor electrode material, it is not conducive to the rapid penetrati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82Y40/00
Inventor 包永忠吴启强黄志明
Owner ZHEJIANG UNIV
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