Thermo-sensitive polyurethane sponge with controllable hydrophilcity-hydrophobicity conversion, and preparation method and application of thermo-sensitive polyurethane sponge

A polyurethane sponge, temperature-sensitive technology, applied in separation methods, chemical instruments and methods, liquid separation, etc., can solve problems such as obstacles to sustainable industrial production, harsh conditions, etc., and achieve low cost, environmental friendliness, and simple operation methods. Effect

Active Publication Date: 2018-07-31
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Recently, Chinese invention patent application CN 106955676 A discloses a melamine foam for temperature-responsive oil-water separation and its preparation method, mainly grafting PNIPAM on the surface of three-dimensional porous amine foam to obtain a surface with adjustable wettability , but the atom transfer radical polymerization method used in this invention requires a strict water and oxygen removal environment, and the conditions are harsh, which has great obstacles to the realization of sustainable industrial production

Method used

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  • Thermo-sensitive polyurethane sponge with controllable hydrophilcity-hydrophobicity conversion, and preparation method and application of thermo-sensitive polyurethane sponge
  • Thermo-sensitive polyurethane sponge with controllable hydrophilcity-hydrophobicity conversion, and preparation method and application of thermo-sensitive polyurethane sponge
  • Thermo-sensitive polyurethane sponge with controllable hydrophilcity-hydrophobicity conversion, and preparation method and application of thermo-sensitive polyurethane sponge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034](1) Preparation of polyurethane sponge containing hydroxyl groups on the surface: 100 g / L of chromium oxide solution and 100 g / L of concentrated sulfuric acid solution are mixed in equal volume to prepare a chromic acid solution, and then 0.1122 g of polyurethane sponge is soaked in the chromic acid solution After middle 90 seconds, obtain the polyurethane sponge that surface contains hydroxyl;

[0035] (2) Preparation of polyurethane sponge with double bonds on the surface: ultrasonically disperse 0.02 ml of vinyltrichlorosilane in 20 ml of n-hexane for 1 minute to obtain a uniform mixed solution; add the polyurethane sponge with hydroxyl on the surface to the above mixed solution , soaking reaction for 0.5 hours, and vacuum drying at 50°C for 5 hours after taking it out to obtain a polyurethane sponge with double bonds on the surface;

[0036] (3) Preparation of temperature-sensitive polyurethane sponge with controllable hydrophilic-hydrophobic conversion: 0.5 gram of ...

Embodiment 2

[0042] (1) Preparation of polyurethane sponge containing hydroxyl groups on the surface: 120 g / liter of chromium oxide solution and 120 g / liter of concentrated sulfuric acid solution are mixed to form chromic acid solution, and then 0.1331 g of polyurethane sponge is soaked in chromic acid solution After middle 70 seconds, obtain the polyurethane sponge that surface contains hydroxyl;

[0043] (2) Preparation of polyurethane sponge with double bonds on the surface: ultrasonically disperse 0.08 ml of vinyltrichlorosilane in 20 ml of cyclohexane for 5 minutes to obtain a uniform mixed solution; add the polyurethane sponge with hydroxyl on the surface to the above mixing In the solution, immerse for 3 hours, take it out and dry it in vacuum at 80°C for 5 hours to obtain a polyurethane sponge with double bonds on the surface;

[0044] (3) Preparation of thermosensitive polyurethane sponge with controllable hydrophilic-hydrophobic conversion: 0.8 gram of N-isopropylacrylamide monom...

Embodiment 3

[0047] (1) Preparation of polyurethane sponge containing hydroxyl groups on the surface: chromium oxide solution of 80 g / liter and concentrated sulfuric acid solution of 80 g / liter are mixed in equal volume to prepare chromic acid solution, and then 0.1411 gram of polyurethane sponge is soaked in chromic acid solution After 60 seconds in the middle, obtain the polyurethane sponge that surface contains hydroxyl;

[0048] (2) Preparation of polyurethane sponge with double bonds on the surface: ultrasonically disperse 0.1 milliliter of acryltrichlorosilane in 20 milliliters of n-hexane for 8 minutes to obtain a uniform mixed solution; add the polyurethane sponge with hydroxyl on the surface to the above mixed solution immersion reaction for 1 hour, and vacuum drying at 60°C for 5 hours after taking it out to obtain a polyurethane sponge with double bonds on the surface;

[0049] (3) Preparation of temperature-sensitive polyurethane sponge with controllable hydrophilic-hydrophobic...

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Abstract

The invention discloses thermo-sensitive polyurethane sponge with controllable hydrophilcity-hydrophobicity conversion, and a preparation method and application of the thermo-sensitive polyurethane sponge. The preparation method comprises the following steps: during preparation, impregnating polyurethane sponge in a chromic acid solution for coarsening to enable the surface of the polyurethane sponge to be rich in hydroxyl, then modifying the polyurethane sponge with a silane coupling agent containing double bonds, and finally grafting N-isopropylacrylamide monomers onto the polyurethane sponge through thermal-initiation polymerization so as to obtain the thermo-sensitive polyurethane sponge with controllable hydrophilcity-hydrophobicity conversion. The polyurethane sponge has temperatureresponse; the contact angle of the surface with water varies in a range of 0-150 degrees through the regulation of external temperature, so that the hydrophilcity-hydrophobicity conversion of the polyurethane sponge is realized; the oil adsorbed by the polyurethane sponge can be automatically discharged at a lower temperature without the press of external force, the oil precipitation rate is 95%,and the polyurethane sponge after the oil-water separation can be recycled after being cleaned and dried. The polyurethane sponge provided by the invention has the advantages of simple operation method, low cost, environmental friendliness and suitability for industrial production.

Description

technical field [0001] The invention relates to a functional material for oil-water separation, in particular to a temperature-sensitive polyurethane sponge with controllable hydrophilic-hydrophobic conversion and a preparation method thereof. Background technique [0002] Covering the surface of the material with a responsive polymer enables it to realize the reversible switch from hydrophilic to hydrophobic under external stimuli (such as electricity, light, heat, pH value, etc.). This controllable hydrophilic-hydrophobic conversion material plays an important role in the field of oil-water separation. People only need to control the external conditions to realize the absorption-discharge of oil or the absorption-discharge of water in the oil-water mixture, so as to achieve the purpose of oil-water separation. . [0003] Among the responsive polymers, poly N-isopropylacrylamide (PNIPAM) is very sensitive to temperature, its low critical transition temperature (LCST) is cl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/40C08J9/42B01D17/022C08L75/04
CPCB01D17/0202C08J9/40C08J9/405C08J9/42C08J2375/04
Inventor 李光吉易鹏林殷雷
Owner SOUTH CHINA UNIV OF TECH
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