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Low quantitative superhydrophobic filter paper and preparation method thereof

A super-hydrophobic, low-quantity technology, applied in the direction of filter paper, separation methods, chemical instruments and methods, etc., can solve the problems of short service life, unevenness, easy falling off, etc., and achieve the effect of easy dispersion, good stability and firm combination

Active Publication Date: 2021-10-08
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among these methods, the solution immersion method is widely used to prepare the surface of various superhydrophobic materials due to its high efficiency in constructing micro / nano structures on the surface of the material and its simplicity and ease of operation. It is easy to cause unevenness, easy to fall off, and short service life

Method used

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  • Low quantitative superhydrophobic filter paper and preparation method thereof
  • Low quantitative superhydrophobic filter paper and preparation method thereof
  • Low quantitative superhydrophobic filter paper and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A low-weight ultra-hydrophobic filter paper, including modified filter paper and a coating applied to its surface; the coating includes a microcrystalline cellulose / modified nano-silica mixed layer and a hydrophobic film layer; two coating quality The ratio is 3:1, the coating weight is 3g / m 2 .

[0029] The preparation method of above-mentioned low quantitative ultra-hydrophobic filter paper is:

[0030] 1) Clean the filter paper with ethanol ultrasonically for 3 times, dry at 60°C for 30 minutes, and set aside;

[0031] 2) Soak the filter paper treated in step 1) in a 65% zinc chloride solution at 75°C for 3 minutes, take it out and ultrasonically clean it with ethanol for 3 times, dry it at 60°C for 30 minutes, and set aside;

[0032] 3) Micro-nano structure coating preparation: 20 μm microcrystalline cellulose preparation concentration is 5% solution, at a stirring speed of 100r / min, add 2% modified silica solution, the volume ratio of the two is 3:1, and the mixe...

Embodiment 2

[0041] A low-weight ultra-hydrophobic filter paper, including modified filter paper and a coating applied to its surface; the coating includes a microcrystalline cellulose / modified nano-silica mixed layer and a hydrophobic film layer; two coating quality The ratio is 5:1, the coating weight is 5g / m 2 .

[0042] The preparation method of above-mentioned low quantitative ultra-hydrophobic filter paper is:

[0043] 1) Clean the filter paper with ethanol ultrasonically for 3 times, dry it at 30°C for 10 minutes, and set aside;

[0044] 2) Soak the filter paper treated in step 1) in a 65% zinc chloride solution at 75°C for 3 minutes, take it out and ultrasonically clean it with ethanol for 3 times, dry it at 30°C for 10 minutes, and set aside;

[0045] 3) Micro-nano structure coating preparation: 50 μm microcrystalline cellulose preparation concentration is 5% solution, at a stirring speed of 150r / min, add 2% modified silica solution, the volume ratio of the two is 3:1, and the m...

Embodiment 3

[0054] A low-weight ultra-hydrophobic filter paper, including modified filter paper and a coating applied to its surface; the coating includes a microcrystalline cellulose / modified nano-silica mixed layer and a hydrophobic film layer; two coating quality The ratio is 4:1, the coating weight is 4g / m 2 .

[0055] The preparation method of above-mentioned low quantitative ultra-hydrophobic filter paper is:

[0056] 1) Clean the filter paper with ethanol ultrasonically for 3 times, dry it at 45°C for 20 minutes, and set aside;

[0057] 2) Soak the filter paper treated in step 1) in a 65% zinc chloride solution at 75°C for 2 minutes, take it out and ultrasonically clean it with ethanol for 3 times, dry it at 45°C for 20 minutes, and set aside;

[0058] 3) Micro-nano structure coating preparation: 40 μm microcrystalline cellulose preparation concentration is 5% solution, at a stirring speed of 200r / min, add 2% modified silica solution, the volume ratio of the two is 1:3, and the m...

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Abstract

The invention relates to the technical field of superhydrophobic materials, in particular to a low-weight superhydrophobic filter paper and a preparation method thereof. It can improve the bonding strength and effective bonding ability between the coating and the paper, so that it can effectively perform the filtering function for a long time. The preparation method is simple and easy, green and environmentally friendly, simple to operate, does not require expensive instruments and equipment, and is easy to realize industrialization. The superhydrophobic filter paper of the present invention is to construct 20-200nm modified nano silicon dioxide and 20-50 μm microcrystalline cellulose micro-nano coating and hydrophobic layer on the surface of modified filter paper, wherein the water contact angle of the paper surface is greater than 150°, the rolling angle of water droplets on the paper surface is less than 10°.

Description

technical field [0001] The invention relates to the technical field of superhydrophobic materials, in particular to a low-weight superhydrophobic filter paper and a preparation method thereof. Background technique [0002] Paper is a common and indispensable substance in daily life. Paper fiber has good hydrophilicity because it contains hydrophilic groups. Modifying the surface of paper, endowing it with super-hydrophobic properties, and forming a bionic lotus leaf effect on the surface of paper can improve the performance of paper, making it hydrophobic and self-cleaning, thereby expanding its application range. [0003] The commonly used method is to coat a layer of waterproof substances such as paraffin or asphalt on the surface of the paper. However, the contact angle between the surface of these papers and water is usually less than 120°, and this method is difficult to apply to filter paper. In practice, because the filter is only sensitive to water and oil, the fil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H27/08D21H19/82D21H19/34D21H19/14D21H23/56D21H25/04D21H25/06
CPCD21H19/14D21H19/34D21H19/824D21H23/56D21H25/04D21H25/06D21H27/08
Inventor 曹鑫宇胡志军王姗姗刘全鑫龙逑夏广立
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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