Super-hydrophobic magnetic mixture as well as preparation method and application thereof

A hybrid, super-hydrophobic technology, applied in magnetic coatings, inorganic compound addition, special paper, etc., can solve the problems of weak binding force between CNF and inorganic magnetic particles, the preparation process is not environmentally friendly, and hinders practical application, etc. High hydroxyl activity, reducing or avoiding shedding effect

Pending Publication Date: 2020-01-24
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current problem in its preparation process is that its preparation process is not environmentally friendly, especially in the superhydrophobic modification process, organic solvents are often used, and the binding force between CNF and inorganic magnetic particles is weak, resulting in poor mechanical properties and hindering its further practical application.

Method used

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  • Super-hydrophobic magnetic mixture as well as preparation method and application thereof
  • Super-hydrophobic magnetic mixture as well as preparation method and application thereof
  • Super-hydrophobic magnetic mixture as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] CNF / Fe 3 o 4 Modification of the mixture

[0039] Use the diameter to be 5-20nm, the nano-cellulose fibril (CNF) that length is 0.5-2 μm is formulated as 0.8wt% water suspension, adds the Fe of 15wt% 3 o 4 (Particle size is 5-20nm) Mix and stir for 30min, adjust the pH value of the mixture to 7. Then add a hydrophobic modifier composed of divinyltriaminopropyltrimethoxysilane (AS) and octyltrimethoxysilane (OTMS) (the volume ratio of OTMS and AS is 1:0.5), and continue to stir for 6 hours , to get CNF / Fe 3 o 4 modified mixture.

[0040] CNF / Fe 3 o 4 Preparation of superhydrophobic magnetic airgel

[0041] The above CNF / Fe 3 o 4 Pour the modified mixture into a mold with a length × width × height of 30 × 30 × 15cm, place it in liquid nitrogen, keep the height of the liquid nitrogen at about one-third of the height of the mold and freeze for 15 minutes, and wait for the CNF / Fe 3 o 4 The modified mixture is completely frozen into ice crystals; then it is moved...

Embodiment 2

[0043] CNF / Fe 3 o 4 Modification of the mixture

[0044] Use CNF with a diameter of 5-20nm and a length of 0.5-2μm to prepare a 0.8wt% aqueous suspension and add 20wt% Fe 3 o 4 (Particle size is 5-20nm) Mix and stir for 30min, adjust the pH value of the mixture to 7. Then add a combined modifier consisting of divinyltriaminopropyltrimethoxysilane (AS) and 1H,1H,2H,2H,-perfluorooctyltriethoxysilane (POTS) (POTS and AS volume The ratio is 1:0.5), continue to stir for 6 hours, you can get CNF / Fe 3 o 4 modified mixture.

[0045] CNF / Fe 3 o 4 Preparation of superhydrophobic magnetic paper

[0046] The above CNF / Fe 3 o 4 Pour the modified mixture into a funnel with a sand core, connect the suction filter, and filter to form; then put it in a blast drying oven at 170°C for 30 minutes to obtain CNF / Fe 3 o 4 Superhydrophobic magnetic paper.

Embodiment 3

[0048] CNF / Fe 3 o 4 Modification of the mixture

[0049] Use CNF with a diameter of 5-20nm and a length of 0.5-2μm to prepare a 0.8wt% aqueous suspension and add 25wt% Fe 3 o 4 (Particle size is 5-20nm) Mix and stir for 30min, adjust the pH value of the mixture to 7. Then add a combined modifier consisting of divinyltriaminopropyltrimethoxysilane (AS) and 1H,1H,2H,2H-perfluorooctyltrichlorosilane (PFCTS) (the volume ratio of PFCTS and AS is 1 :0.5), continue to stir for 6 hours to get CNF / Fe 3 o 4 modified mixture.

[0050] CNF / Fe 3 o 4 Preparation of superhydrophobic magnetic coating

[0051] Using wood block as substrate, the above CNF / Fe 3 o 4 Put the modified mixture into a spray gun, spray it directly on the surface of the wood block, and put it in a blast drying oven at 170°C for 30 minutes to obtain CNF / Fe 3 o 4 Superhydrophobic magnetic coating.

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Abstract

The invention discloses a super-hydrophobic magnetic mixture which comprises a CNF (carbon nanofiber) water suspension, Fe3O4 nanoparticles and a hydrophobic modifier which are mixed mutually, whereinthe hydrophobic modifier is prepared from long-chain siloxane/fluorosilane and diethylenetriamine propyl trimethoxysilane (AS) through mixing. The super-hydrophobic magnetic mixture has the beneficial effects that a super-hydrophobic magnetic aerogel, paper and coating with good mechanical properties can be prepared, the preparation process is simple and environmental-friendly, and no organic solvent is used in the whole process.

Description

technical field [0001] The invention relates to the field of functional materials, in particular to a superhydrophobic magnetic mixture and its preparation method and application. Background technique [0002] Cellulose nanofibrils (CNF) are a natural polymer with large specific surface area, high aspect ratio, and natural degradation. The preparation of CNF-based functional materials has been the focus of attention in recent years. Among them, CNF-based superhydrophobic magnetic materials have great potential applications in the fields of oil-water separation, electromagnetic shielding, and self-cleaning. Its preparation is mainly realized by dispersing inorganic magnetic particles in CNF materials, and then performing superhydrophobic modification. [0003] However, the current problem in its preparation process is that its preparation process is not environmentally friendly, especially in the superhydrophobic modification process, organic solvents are often used, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/04C08K3/22C08K5/544C08K5/5419C08J9/28C09D101/04C09D5/23C09D7/63D21H17/67D21H17/13D21H11/18D21H27/00D21F13/00
CPCC08K3/22C08K5/544C08K5/5419C08J9/28C08J9/008C08J9/0095C08J9/0042C09D101/04C09D7/63D21H17/675D21H17/13D21H11/18D21H27/00D21F13/00C08J2301/04C08K2003/2275C08K2201/01C08K2201/011
Inventor 黄景达张晓春吴强李倩
Owner ZHEJIANG FORESTRY UNIVERSITY
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