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Method for synthesizing graphene-polydimethylsiloxane (PDMS) functional sponge

A technology of polydimethylsiloxane and synthesis method, applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc., can solve the problem that nano-fillers are easy to fall off, easy to agglomerate, and production costs High-level problems, to achieve the effect of good recycling capacity, high adsorption capacity and easy operation

Active Publication Date: 2016-11-09
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Technical problem: In order to overcome the defects and deficiencies of high production cost and easy falling off and agglomeration of nanofillers in the existing synthesis method, the purpose of the present invention is to provide a simple and highly efficient graphene-polydimethylsiloxane functional The synthetic method of the sponge prepares a functional sponge with compressibility, strong hydrophobicity and stable structure. This functional sponge can selectively adsorb and separate oil or organic solvents in the water phase, and exhibits environmental protection in practical applications. Friendly, renewable and mass-producible

Method used

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  • Method for synthesizing graphene-polydimethylsiloxane (PDMS) functional sponge
  • Method for synthesizing graphene-polydimethylsiloxane (PDMS) functional sponge
  • Method for synthesizing graphene-polydimethylsiloxane (PDMS) functional sponge

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Experimental program
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Effect test

Embodiment 1

[0034] Take 1g of PDMS prepolymer to prepare a solution of ethyl acetate with a concentration of 0.05g / ml, add 15mg of graphene powder to the above mixed solution, put the entire reaction system into an ultrasonic cleaner, start timing, and continue ultrasonic (power Density 1.5W / cm 2 , frequency 53kHz). When the ultrasonic time reaches 30min, add synthetic PDMS curing agent (the mass ratio of prepolymer and curing agent is 10:1) and sea crystal salt templating agent (10g) in the system; when the ultrasonic time reaches 120min, the mixed solution The ethyl acetate volatilized completely, and the gray viscous graphene-silicone rubber-sea crystal composite material was obtained. Put the composite material into a mold, dry and calcinate at 60-90°C for 12 hours, put it into hot water at 80-100°C to dissolve the template, repeat 3 times, and obtain a graphene-silicone rubber functional sponge after drying at 60-80°C. The contact angle of the surface of the structure to water is 1...

Embodiment 2

[0036] Take 1g of PDMS prepolymer to prepare a solution of ethyl acetate with a concentration of 0.05g / ml, add 30mg of graphene powder to the above mixed solution, put the entire reaction system into an ultrasonic cleaner, start timing, and continue ultrasonic (power Density 1.5W / cm 2, frequency 53kHz). When the ultrasonic time reaches 30min, add synthetic PDMS curing agent (the mass ratio of prepolymer and curing agent is 10:1) and sea crystal salt templating agent (10g) in the system; when the ultrasonic time reaches 120min, the mixed solution The ethyl acetate volatilized completely to obtain a gray sticky graphene-silicone rubber-sea crystal salt composite material. Put the composite material into a mold, dry and calcinate at 60-90°C for 12 hours, dissolve the template in hot water at 80-100°C, repeat 3 times, and obtain a graphene-silicone rubber functional sponge after drying at 60-80°C.

[0037] Its microstructure was characterized by scanning electron microscopy (see...

Embodiment 3

[0039] Get 1g of PDMS prepolymer to prepare a solution of ethyl acetate with a concentration of 0.05g / ml, add 15mg of graphene to the above mixed solution, put the whole reaction system into an ultrasonic cleaner, start timing, and continue ultrasonic (power density 1.5 W / cm 2 , frequency 53kHz). When the ultrasonic time reaches 30min, add synthetic PDMS curing agent (the mass ratio of prepolymer and curing agent is 10:1) and soft white sugar template (6g) in the system; when the ultrasonic time reaches 120min, the acetic acid in the mixture Ethyl ester volatilizes completely, obtains the gray viscous graphene-silicone rubber-soft white sugar composite material. Put the composite material into a mold, dry and calcinate at 60-90°C for 12 hours, put it into hot water at 80-100°C to dissolve the template, repeat 3 times, and obtain a graphene-silicone rubber functional sponge after drying at 60-80°C. The contact angle of the surface of the structure to water is 142°.

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Abstract

The invention relates to a method for efficiently synthesizing graphene-polydimethylsiloxane (PDMS) functional sponge. The method comprises the following steps: (1) preparing a uniform suspension solution of graphene-PDMS prepolymer-diluent by means of an ultrasound cavitation effect; (2) coating the graphene-PDMS mixture to the surface of a template agent by utilizing the volatilization effect of a solvent; and (3) performing cross-linking and curing on PDMS, and removing the template and the dried sample to obtain the graphene-polydimethylsiloxane functional sponge. The synthesizing process is simple and efficient, and can be used for solving the defect that nano-additives are easily coagulated and easily separated in the using process; and the prepared functional sponge shows the characteristics of unique surface structure, excellent mechanical performance, special moistening performance, flexible plasticizing performance and the like. The graphene-polydimethylsiloxane functional sponge is applied to separation of oil or a non-polar organic solvent in a water body, has high adsorption capability, high adsorption speed, strong selectivity and good recycling capability, and has potential application values in the fields of crude oil leakage treatment, industrial organic liquid waste treatment and the like.

Description

technical field [0001] The invention relates to a method for efficiently synthesizing graphene-polydimethylsiloxane functional sponge, which is suitable for separating oil products or non-polar organic solvents in an aqueous phase system, and belongs to the field of preparation of new functional materials. Background technique [0002] Polydimethylsiloxane (PDMS) is a high-molecular silicone rubber with good elasticity, stability, non-polarity, compatibility and easy processing, and is the preferred material for the preparation of functional silicone rubber sponges. It has been reported in the literature that sugar crystals, salt crystals, colloidal microspheres, ammonium bicarbonate and other template porogens are added to the PDMS system, and the PDMS components are coated on the surface of the template for exchange by virtue of the capillary force between the template pores. After curing, a three-dimensional connected network structure is formed. After removing the templa...

Claims

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Application Information

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IPC IPC(8): C08J9/26C08J3/28C08L83/04C08K3/04B01J20/26B01J20/28B01J20/30C02F1/28C02F101/32C02F101/30
CPCB01J20/20B01J20/268B01J20/28045C02F1/288C02F2101/30C02F2101/32C08J3/28C08J9/26C08J2201/0422C08J2201/0446C08J2383/04C08K3/04C08K2201/011C08L2203/14C08L83/04
Inventor 仇实孙立涛
Owner SOUTHEAST UNIV
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