Intrinsic super-hydrophobic nano cellulose aerogel and preparation method thereof

A nanocellulose and aerogel technology, which is applied in the field of intrinsic superhydrophobic nanocellulose aerogel and its preparation, can solve the problem of increasing the thermal conductivity of pure aerogels of composite materials and limiting the application of nanocellulose aerogels. , Nanocellulose aerogel is easy to absorb moisture and other problems, to achieve the effect of integrated waterproof and moisture permeability, low density, excellent hydrophobic durability

Inactive Publication Date: 2020-05-22
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong hydrophilicity of nanocellulose particles, nanocellulose airgel is easy to absorb moisture, and the airgel is brittle, poor in mechanical properties, and high in cost, which limits the application of nanocellulose aerogels.
Domestic patents CN106945362 and CN107097492 disclose a method for preparing a waterproof and moisture-permeable airgel material. Compared with pure airgel, the thermal conductivity of the material has increased; in addition, the material realizes the waterproof and moisture-permeable function of the airgel by attaching a waterproof and moisture-permeable film on the surface of the airgel, and there are certain limitations in functional durability.

Method used

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  • Intrinsic super-hydrophobic nano cellulose aerogel and preparation method thereof
  • Intrinsic super-hydrophobic nano cellulose aerogel and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] (1) Prepare 100mL of nanocellulose dispersion with a concentration of 1wt.%, add 0.5g of N,N-methylenebisacrylamide crosslinking agent, and stir mechanically for 5min to obtain a uniform precursor solution; orient the precursor solution Freeze until the precursor solution is completely frozen; freeze-dry the obtained wet gel for 48 hours, and remove the liquid to obtain nanocellulose airgel.

[0028] (2) Dissolve 4g of polydimethylsiloxane (PDMS) in 100mL of cyclohexane, configure a concentration of 4wt% low surface energy polymer solution, add 0.08g of photocuring agent 1173, and then add 3g of micronano titanium dioxide ( TiO 2 ) ratio of micron:nano 3:5, ultrasonic dispersion (100W, 40kHz) for 30min, to prepare uniform low surface energy polymer / micronano particle dispersion.

[0029] (3) Immerse (1) nanocellulose airgel in the dispersion of (2), and the intensity is 220mW / cm when the wavelength is 365nm 2 UV cured for 60s, then took it out and put it in a fume hoo...

Embodiment 2

[0031] (1) Prepare 100 mL of nanocellulose dispersion with a concentration of 2wt.%, add 1.0 g of N,N-methylenebisacrylamide crosslinking agent, and stir mechanically for 5 minutes to obtain a uniform precursor solution; orient the precursor liquid Freeze until the precursor solution is completely frozen; freeze-dry the obtained wet gel for 48 hours, and remove the liquid to obtain nanocellulose airgel.

[0032] (2) Dissolve 4g of polydimethylsiloxane (PDMS) in 100mL of cyclohexane, configure a concentration of 4wt% low surface energy polymer solution, add 0.08g of photocuring agent 1173, and then add 3g of micronano titanium dioxide ( TiO 2 ) ratio of micron:nano 3:5, ultrasonic dispersion (100W, 40kHz) for 30min, to prepare uniform low surface energy polymer / micronano particle dispersion.

[0033] (3) Immerse (1) nanocellulose airgel in the dispersion of (2), and the intensity is 220mW / cm when the wavelength is 365nm 2 UV cured for 60s, then took it out and put it in a fum...

Embodiment 3

[0035] (1) Prepare 100mL of nanocellulose dispersion with a concentration of 1wt.%, add 0.5g of N,N-methylenebisacrylamide crosslinking agent, and stir mechanically for 5min to obtain a uniform precursor solution; orient the precursor solution Freeze until the precursor solution is completely frozen; freeze-dry the obtained wet gel for 48 hours, and remove the liquid to obtain nanocellulose airgel.

[0036] (2) Dissolve 6g of polydimethylsiloxane (PDMS) in 100mL of cyclohexane, configure a low surface energy polymer solution with a concentration of 6wt%, add 0.08g of photocuring agent 1173, and then add 3g of micronano titanium dioxide ( TiO 2 ) ratio of micron:nano 4:4, ultrasonic dispersion (100W, 40kHz) for 30min, to prepare uniform low surface energy polymer / micronano particle dispersion.

[0037](3) Immerse (1) nanocellulose airgel in the dispersion of (2), and the intensity is 220mW / cm when the wavelength is 365nm 2 UV cured for 60s, then took it out and put it in a fu...

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Abstract

The invention discloses intrinsic super-hydrophobic nano cellulose aerogel and a preparation method thereof. The preparation method comprises the following steps: adding a cross-linking agent into a nano-cellulose dispersion liquid to obtain a precursor solution, and carrying out oriented freezing and drying on the precursor solution to prepare three-dimensional ordered nano-cellulose aerogel; anddipping the aerogel into a low-surface-energy polymer/micro-nano inorganic particle dispersion liquid, and curing and drying to prepare the intrinsic super-hydrophobic nano cellulose aerogel. According to the preparation method, the nano-cellulose fiber dispersion liquid is used as a precursor, ice crystals are used as a template, the nucleation and growth speed and direction of the ice crystalsare regulated and controlled by changing the temperature gradient, and the ice template is removed by freeze drying, so that the three-dimensional ordered nano cellulose aerogel material is prepared;by adding polydimethylsiloxane and micron/nano titanium dioxide particles, the super-hydrophobic aerogel with a low-surface-energy polymer/micro-nano coarse structure is constructed. The prepared nanocellulose aerogel has excellent hydrophobic performance and can be applied to the fields of heat preservation, cold prevention and oil absorption.

Description

technical field [0001] The invention relates to an intrinsic superhydrophobic nano-cellulose airgel and a preparation method thereof, belonging to the technical field of preparation of nano-functional materials. Background technique [0002] The core material of cold-proof and warm clothing widely used at present is mainly down. As a light-weight, warm-keeping, high-elastic and fluffy wadding material, the thermal conductivity of down is only 0.024W / m·K, and the bulk density is only one-third of that of cotton wadding. , the advantages are very prominent, however, down jackets have better warmth retention in a dry state, but the warmth retention will decrease significantly in a humid environment. In order to solve the problem of thermal insulation performance decline after moisture absorption of thermal insulation materials, researchers have successively developed synthetic thermal insulation flocs, which have the advantages of wide source of raw materials, high strength, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/42C08J9/28C08L1/02C08F251/02C08F222/38
CPCC08F251/02C08J9/28C08J9/42C08J2301/02C08J2483/04C08F222/385
Inventor 刘丽芳张美玲降帅李萌萌王妮
Owner DONGHUA UNIV
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