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Preparation process and application of polydimethylsiloxane/graphene oxide porous composite material

A polydimethylsiloxane, porous composite material technology, applied in chemical instruments and methods, immiscible liquid separation, liquid separation, etc., can solve the problem of poor mechanical performance and cycle performance, harsh preparation process, and limited practical application. and other problems, to achieve the effect of low production cost, good mechanical properties and good reusability

Active Publication Date: 2018-09-04
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural oil-absorbing materials, such as natural expanded graphite, straw, wool, wood fiber, etc., rely on the pores of the material itself to absorb through capillary action, but there are disadvantages such as low oil absorption ratio, poor oil retention performance, slow oil absorption speed, and both oil and water absorption.
Chemically synthesized oil-absorbing materials have developed rapidly in recent years, and can be divided into two types: the first is intrinsically hydrophobic porous polymers, which rely on van der

Method used

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  • Preparation process and application of polydimethylsiloxane/graphene oxide porous composite material
  • Preparation process and application of polydimethylsiloxane/graphene oxide porous composite material
  • Preparation process and application of polydimethylsiloxane/graphene oxide porous composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1, comparative example 1

[0044] 1. Sample preparation

[0045] (1) The preparation of embodiment 1 sample is carried out as follows:

[0046] Step 1: Mix 5.0g of polydimethylsiloxane (PDMS) prepolymer Sylgard 184A, 0.5g of cross-linking agent Sylgard184B and 6.0g of cyclohexane with ultrasonic (power 250W) and stir for 15min, then add 40.0g of sucrose (20.0g of raw sucrose with a particle size of 900-1800μm, 20.0g of white soft sugar with a particle size of 50-500μm), stir evenly, pour into a polytetrafluoroethylene mold and flatten it, and solidify at a temperature of 60°C 8h. After the reaction, the obtained PDMS-sucrose solid mixture was removed from the mold and placed in water at 80°C to dissolve the sucrose, washed with deionized water and absolute ethanol in sequence, and dried to obtain 5.02 g of PDMS porous material;

[0047] Step 2: Put 5.02 g of the PDMS porous material obtained in Step 1 in a 5M sodium hydroxide solution, and stir the reactio...

Embodiment 2

[0064] Embodiment 2, comparative example 2

[0065] 1. Sample preparation

[0066] (1) The preparation of embodiment 2 sample is carried out as follows:

[0067] Step 1-3: For the synthesis steps and process of the aminated PDMS porous material, refer to steps 1, 2 and 3 in Example 1;

[0068]Step 4: Immerse 4.00 g of the aminated PDMS porous material into a DMF dispersion (90 mL) of graphene oxide (GO) with a concentration of 2 mg / mL and a sheet diameter of 0.2 to 10 μm, and then slowly (20 min) drop A DMF solution (10 mL) of N,N'-dicyclohexylcarbodiimide (4.0 g) and 4-dimethylaminopyridine (0.3 g) was added, then the temperature was raised to 60° C. and the reaction was stirred for 20 h. After the reaction, the product was washed twice with DMF and once with absolute ethanol, and then vacuum-dried at 40°C for 1 day to obtain 4.02 g of PDMS / GO porous composite material.

[0069] (2) The preparation of comparative example 2 sample is carried out as follows:

[0070] Step 1...

Embodiment 3

[0079] Embodiment 3, comparative example 3

[0080] 1. Sample preparation

[0081] (1) The preparation of embodiment 3 sample is carried out as follows:

[0082] Step 1-3: For the synthesis steps and process of the aminated PDMS porous material, refer to steps 1, 2 and 3 in Example 1;

[0083] Step 4: immerse 2.52g of the aminated PDMS porous material into a DMF dispersion (90mL) of graphene oxide (GO) with a concentration of 1mg / mL and a sheet diameter of 0.2 to 10 μm, and then slowly (20min) ) was added dropwise with a DMF solution (10 mL) of N,N'-dicyclohexylcarbodiimide (4.0 g) and 4-dimethylaminopyridine (0.6 g), then heated to 70° C. and stirred for 20 h. After the reaction, the product was washed twice with DMF and once with absolute ethanol, and then dried in vacuum at 40°C for 1 day to obtain 2.54 g of PDMS / GO porous composite material.

[0084] (2) The preparation of comparative example 3 sample is carried out as follows:

[0085] Step 1-3: For the synthesis step...

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Abstract

The invention discloses a preparation process and application of a polydimethylsiloxane/graphene oxide porous composite material. The preparation process comprises the following steps: (1) preparing aPDMS porous material; (2) placing the PDMS porous material in a strong alkaline solution for hydroxylation so as to obtain a hydroxylated PDMS porous material; (3) infiltrating the hydroxylated PDMSporous material in an alcohol-water solution of KH550 for amination so as to obtain an aminated PDMS porous material; and (4) infiltrating t the aminated PDMS porous material in a graphene oxide dispersion with a concentration of 0.1 to 2 mg/mL, then slowly adding a mixed solution of DCC and DMAP drop by drop, carrying out heating to 60 to 80 DEG C after completion of addition, carrying out a stirring reaction, and after completion of the reaction, successively washing and drying a product so as to obtain the polydimethylsiloxane/graphene oxide porous composite material. The composite materialhas high hydrophobic and lipophilic characteristics, high oil-water selective adsorption capacity and good mechanical properties. The invention also provides the application of the composite materialas an oil absorbing material to oil-water separation.

Description

technical field [0001] The invention relates to a preparation process of a polydimethylsiloxane / graphene oxide porous composite material and its application as an oil-absorbing material in oil-water separation. Background technique [0002] In recent years, with the rapid development of modern industry, the exploitation, production, transportation and use of crude oil and various refined oils have become an important part of the country's economic development. Emissions pose a serious threat to the ecological environment and human health. Therefore, effective control of water body oil pollution has become an urgent issue to be explored and solved. [0003] So far, the adsorption treatment of oily wastewater by using oil-absorbing materials is one of the most commonly used methods. At present, oil-absorbing materials mainly include natural oil-absorbing materials and chemically synthesized oil-absorbing materials. Natural oil-absorbing materials, such as natural expanded g...

Claims

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Application Information

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IPC IPC(8): C08J9/40B01D17/02C08L83/04
CPCB01D17/0202C08J9/40C08J2383/04
Inventor 赵佳钧张冰攀叶会见徐立新
Owner ZHEJIANG UNIV OF TECH
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