Composite superhydrophobic particles, preparation method thereof, and method for preparing superhydrophobic coating

A super-hydrophobic and particle-based technology, applied in coatings and other directions, can solve the problems of high preparation costs, cumbersome steps, and high requirements for controllable operations, achieving good stability and improving brittleness

Active Publication Date: 2018-03-30
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on these two conditions, there are currently many methods for superhydrophobic modification of the surface of solid materials, such as molding method, etching method, electrospinning method, polycondensation method, etc., but some methods have higher preparation costs or are less controllable. The operation requirements are high, the steps are relatively cumbersome, or the modification effect stability and wear resistance are not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] CNF / SiO2 2 Preparation method of composite superhydrophobic particles

[0039] 1) Prepare a 1wt% CNF suspension, transfer it to a mold with a length of 30 mm × width 300 mm × a height of 10 mm, freeze and shape it under liquid nitrogen, and freeze-dry it at -60 ° C and 1 Pa for 3 days to obtain a CNF airgel;

[0040] 2) Immerse the CNF airgel in solution A (the molar ratio of TEOS, absolute ethanol, and water is 1:2:1, and adjust the pH value to 3 with hydrochloric acid) and solution B (the molar ratio of absolute ethanol and water It was 5:2.6, adjusted to pH value 8) with ammonia water for 10 minutes each;

[0041] 3) First impregnate the nanocellulose fiber airgel after step 2) with absolute ethanol (place it at room temperature for 48 hours, change it every 12 hours), and then impregnate it with n-hexane (place it at room temperature for 24 hours , change every 12 hours);

[0042] 4) Then impregnate the nanocellulose fiber airgel treated in step 3) in solution C ...

Embodiment 2

[0044] Preparation method of CNF / SiO2 composite superhydrophobic particles

[0045] 1) Prepare a 5wt% CNF suspension, transfer it to a mold with a length of 30 mm × width 300 mm × a height of 10 mm, freeze and shape it under liquid nitrogen, and freeze-dry it at -60 ° C and 1 Pa for 3 days to obtain a CNF airgel;

[0046] 2) Immerse the CNF airgel in solution A (the molar ratio of TEOS, absolute ethanol, and water is 1:5:1, adjust the pH value to 6 with hydrochloric acid) and solution B (the molar ratio of absolute ethanol and water It was 5:2.6, adjusted to PH value of 12) with ammonia water for 10 minutes each;

[0047] 3) First impregnate the nanocellulose fiber airgel after step 2) with absolute ethanol (place it at room temperature for 48 hours, change it every 12 hours), and then impregnate it with n-hexane (place it at room temperature for 24 hours , change every 12 hours);

[0048] 4) Then impregnate the nanocellulose fiber airgel treated in step 3) in solution C (TM...

Embodiment 3

[0050] Preparation of CNF / SiO2 Composite Superhydrophobic Particles

[0051] 1) Prepare a 2wt% CNF suspension, transfer it to a mold with a length of 30 mm × width 300 mm × a height of 10 mm, freeze and shape it under liquid nitrogen, and dry it at -60 ° C and 1 Pa for 3 days to obtain a CNF airgel;

[0052] 2) Immerse the CNF airgel in solution A (the molar ratio of TEOS, absolute ethanol, and water is 1:3:1, and adjust the pH value to 4 with hydrochloric acid) and solution B (the molar ratio of absolute ethanol and water It was 5:2.6, adjusted to PH value of 10) with ammonia water for 10 minutes each;

[0053] 3) impregnate the nanocellulose fiber airgel after step 2) with absolute ethanol (place it at room temperature for 48 hours, change it every 12 hours), and then impregnate it with n-hexane (place it at room temperature for 24 hours). hours, change every 12 hours);

[0054] 4) Then impregnate the nanocellulose fiber airgel treated in step 3) in solution C (TMCS:n-hexa...

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Abstract

The invention relates to a method for preparing nanocellulose fiber / SiO2 composite superhydrophobic particles, comprising the following steps: 1) configuring 1-5wt% nanocellulose fiber suspension, freezing and forming it, and freeze-drying to obtain nanocellulose Fiber airgel; 2) impregnating the nanocellulose fiber airgel in solution A and solution B respectively for 5-30min; 3) first impregnating the nanocellulose fiber airgel after step 2) with absolute ethanol , then impregnate it with n-hexane; 4) impregnate the nanocellulose fiber airgel treated in step 3) in solution C at room temperature, and dry to obtain the nanocellulose fiber / SiO2 composite airgel in the form of white solid glue, and granulate it to obtain nanocellulose fiber / SiO2 composite superhydrophobic particles. The invention also relates to composite particles produced by this method. The invention further relates to a method for producing coatings using said composite particles.

Description

technical field [0001] The invention relates to a method for preparing microparticles, in particular to a method for preparing composite microparticles. The invention also relates to composite particles produced by this method. The invention further relates to a method for producing coatings using said composite particles. Background technique [0002] Inspired by superhydrophobic phenomena in nature (such as the surface of lotus leaves, butterfly wings, etc.), the superhydrophobic modification of solid material surfaces has always been a research hotspot. Superhydrophobic materials play an important role in anti-pollution, anti-corrosion, and reducing fluid resistance, and have a wide range of potential applications in printing, coatings, adhesives, and other fields. From the Wenzel model to the Cassie model, and then to the coexistence of the Wenzel and Cassie models, the superhydrophobic modification of the surface of solid materials has a relatively complete theoretica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/02C08K3/36C08J9/40C09D5/00C09D7/61
Inventor 吕少一黄景达傅峰
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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