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Superhydrophobic cloth prepared by layered double hydroxide and its preparation process

A hydroxide and layered double technology, applied in textiles, papermaking, fiber treatment, etc., can solve the problems of non-repeated use, non-universal applicability, poor stability, etc., and achieve low cost, high-efficiency oil-water separation effect, hydrophobic good effect

Inactive Publication Date: 2016-01-27
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process described in the present invention applies LDH to commercialized fabrics, which solves the shortcomings of traditional superhydrophobic substrates such as poor stability, inability to be used repeatedly, high cost, and lack of universality, and greatly expands the potential of superhydrophobic fabrics. Application field

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Superhydrophobic cloth prepared by layered double hydroxide and its preparation process
  • Superhydrophobic cloth prepared by layered double hydroxide and its preparation process
  • Superhydrophobic cloth prepared by layered double hydroxide and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Preparation of superhydrophobic cloth and its scanning electron microscope (SEM) picture

[0030] Preparation of superhydrophobic cloth using layered double hydroxide:

[0031] ① Soak the cloth in 0.1mol / L NaOH solution at 100°C for 60 minutes, then take it out, wash it with water, and dry it;

[0032] ② Prepare 0.2mol / LMg(NO 3 ) 2 and 0.1mol / LAl(NO 3 ) 3 Eutectic aqueous solution 10mL, and quickly added to the vigorously stirred NaOH solution (metal and OH - The ratio is 1:3), the stirring time is 20min, and then the obtained precipitate is centrifuged and washed twice, and then redispersed into water to obtain the seed solution of LDH;

[0033] ③Soak the cloth treated in step ① into the LDH seed solution obtained in step ②, place it in a reaction kettle, and react in an oven at 100°C for 18 hours;

[0034] ④ Cool the cloth treated in step ③, wash and dry, then soak in 0.05mol / L sodium laurate solution, react for 5 hours, then take it out, wash and dry...

Embodiment 2

[0037] Example 2: Preparation of superhydrophobic cloth and its use in oil-water separation experiments

[0038] Preparation of superhydrophobic cloth using layered double hydroxide:

[0039] ① Soak the cloth in 0.2mol / L NaOH solution at 90°C for 40 minutes, then take it out, wash it with water, and dry it;

[0040] ② Prepare 0.3mol / LMg(NO 3 ) 2 and 0.1mol / LAl(NO 3 ) 3 Eutectic aqueous solution 10mL, and quickly added to the vigorously stirred NaOH solution (metal and OH - The ratio is 1:2), the stirring time is 30min, and then the obtained precipitate is centrifuged and washed twice, and then redispersed into water to obtain the seed solution of LDH;

[0041] ③Soak the cloth treated in step ① into the LDH seed solution obtained in step ②, place it in a reaction kettle, and react in an oven at 90°C for 24 hours;

[0042] ④ Cool the cloth treated in step ③, wash and dry, then soak in 0.07mol / L sodium laurate solution, react for 4 hours, then take it out, wash and dry to o...

Embodiment 3

[0045] Example 3: Preparation of superhydrophobic cloth and its preparation into an oil-water separation bag and its use in the adsorption test of oil in water

[0046] Preparation of superhydrophobic cloth using layered double hydroxide:

[0047] ① Soak the cloth in 0.3mol / L NaOH solution at 80°C for 50 minutes, then take it out, wash it with water, and dry it;

[0048] ② Prepare 0.1mol / LMg(NO 3 ) 2 and 0.1mol / LAl(NO 3 ) 3 Eutectic aqueous solution 10mL, and quickly added to the vigorously stirred NaOH solution (metal and OH - The ratio is 1:4), the stirring time is 10min, and then the obtained precipitate is centrifuged and washed twice, and then redispersed into water to obtain the seed solution of LDH;

[0049] ③Soak the cloth treated in step ① into the LDH seed solution obtained in step ②, place it in a reaction kettle, and react in an oven at 95°C for 12 hours;

[0050] ④ Cool the cloth treated in step ③, wash and dry, then soak in 0.03mol / L sodium laurate solution...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention provides a layered double hydroxide (LDH) modified super-hydrophobic cloth for oil-water separation and a preparation process thereof. LDH is generated on the surface of commercial cloth by a hydrothermal method in an in-situ manner so as to improve the roughness of the cloth; then a substance with low surface energy is modified to obtain the super-hydrophobic cloth. The super-hydrophobic cloth prepared by the process comprises a cloth fiber layer and a super-hydrophobic LDH sheet layer, wherein the super-hydrophobic LDH sheet layer is formed by an LDH nanosheet which is irregularly and vertically attached on the cloth fiber layer, the chemical structural formula of the LDH nanosheet is [Mg<2+>(1-x)Al<3+>x(OH)2]<x+>[NO3<->]x.mH2O, wherein x represents one numerical value between 0 and 1, and the thickness of the LDH sheet layer is 300-1000nm. The prepared cloth has a contact angle more than 150 degrees, has good oil-water separation capability, can achieve high separation efficiency (up to 97%) to oil water mixture with different ingredients and different volume ratios, and has low relative standard deviation less than 0.7%. The LDH modified super-hydrophobic cloth has important significance on separation of oil water mixture, treatment on pollution of rivers, lakes and the sea caused by petroleum and non-insoluble oil stain.

Description

technical field [0001] The invention relates to a preparation process of super-hydrophobic cloth, in particular to a process for preparing super-hydrophobic cloth by using layered double hydroxide (LDH). Background technique [0002] Superhydrophobicity is a peculiar phenomenon that widely exists in nature. The surfaces of many animals and plants in nature have super-hydrophobic properties. For example, the famous sentence of Zhou Dunyi, a poet in the Northern Song Dynasty, "comes out of silt without staining, washes clean ripples without demons", which describes the super-hydrophobic property of the surface of lotus leaves. The so-called super-hydrophobic means that the contact angle of water droplets on its surface is greater than 150 degrees, that is, the surface of a solid material is difficult to be wetted by water. The study found that the wettability of the solid material surface is an inherent property of the material itself, which is mainly determined by two factor...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/44D06M11/45D06M11/38D06M13/188
Inventor 李峰刘晓娟
Owner QINGDAO AGRI UNIV
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