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A composite quaternary hydrogel capable of realizing high solar evaporation rate and preparation method thereof

A technology of evaporation rate and hydrogel, which is applied in general water supply saving, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of high-speed evaporation of water, high phase change enthalpy, etc., and achieve excellent light-to-heat conversion ability , Enhance energy absorption and reduce heat loss

Active Publication Date: 2022-04-26
ZHEJIANG ZHENENG TECHN RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, water has a high phase change enthalpy at normal temperature and pressure, and the direct use of solar energy input cannot satisfy the high-speed evaporation of water.

Method used

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  • A composite quaternary hydrogel capable of realizing high solar evaporation rate and preparation method thereof
  • A composite quaternary hydrogel capable of realizing high solar evaporation rate and preparation method thereof
  • A composite quaternary hydrogel capable of realizing high solar evaporation rate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A composite quaternary hydrogel that can achieve high solar evaporation rates, as figure 1 and figure 2 As shown, the composite quaternary hydrogel is composed of polyvinyl alcohol gel matrix skeleton 5, carbon-based Chinese ink coating and titanium dioxide coating 1; wherein there are multiple gel internal pores 3 inside the polyvinyl alcohol gel matrix skeleton 5 , the carbon-based Chinese ink coating is composed of nanoparticles 2; the lower surface of the carbon-based Chinese ink coating is attached to the upper surface of a polyvinyl alcohol gel matrix skeleton 5, and the upper surface of the carbon-based Chinese ink coating is attached to a conformal titanium dioxide coating 4 On the lower surface, the upper surface of the conformal titanium dioxide coating 4 is attached to the lower surface of the titanium dioxide coating 1; the surface of the internal channel wall of the polyvinyl alcohol gel matrix skeleton 5 is also deposited with a conformal titanium dioxide...

Embodiment 2

[0039] A method for preparing a composite quaternary hydrogel capable of realizing a high solar evaporation rate, comprising the following steps:

[0040] (1) Dissolve the mixture.

[0041] Prepare the gel matrix solution: heat a certain amount of polyvinyl alcohol in distilled water to 80° C. and stir on an electromagnetic stirring table, and prepare an aqueous solution with a mass fraction of 10%. After being completely dissolved, let it stand for 1 hour to eliminate air bubbles to obtain a clear and transparent solution.

[0042] Preparation of polypyrrole suspension: a certain amount of polypyrrole nanoparticles was dispersed in distilled water and ultrasonically oscillated for 20 minutes to prepare a polypyrrole suspension with a mass fraction of 10%.

[0043] Mixing: Mix the polyvinyl alcohol solution and the polypyrrole suspension according to the mass ratio (polyvinyl alcohol: polypyrrole) of 10:1, and stir for a period of time to make the mixture even, and the mixtur...

Embodiment 3

[0059] Such as image 3 As shown, the composite gel prepared in Example 2 is applied to the evaporation system device and the actual application scene to test its evaporation performance:

[0060] Use die cutting to obtain a light receiving area of ​​4cm 2 The saturated water-containing composite hydrogel (from the composite gel obtained in Example 2) is placed in a foam heat insulating material mold, and the foam heat insulating material is polyethylene white foam, and the vacant area is 4cm 2 . Wrap thermal insulation cotton on the outside of the glass dish to avoid heat conduction loss. The bottom of the composite hydrogel is in contact with water, and the water in the glass dish can be transported vertically and horizontally through the internal pore structure to penetrate into various parts of the composite gel, so sunlight can be absorbed in situ on the surface and inside of the gel for use Evaporate water.

[0061] The experimental results show that at a temperature...

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Abstract

The invention relates to a composite quaternary hydrogel capable of achieving high solar evaporation rate, comprising a polyvinyl alcohol gel matrix skeleton, a carbon-based Chinese ink coating and a titanium dioxide coating; wherein there are multiple polyvinyl alcohol gel matrix skeletons A gel internal channel, the carbon-based Chinese ink coating is composed of nanoparticles; the lower surface of the carbon-based Chinese ink coating is attached to the upper surface of the polyvinyl alcohol gel matrix skeleton, and the upper surface of the carbon-based Chinese ink coating is attached to conformal titanium dioxide The lower surface of the coating, the upper surface of the conformal titanium dioxide coating is attached to the lower surface of the titanium dioxide coating. The beneficial effects of the present invention are: facilitating the in-situ conversion and utilization of solar energy; improving the efficiency of solar seawater evaporation and desalination; effectively enhancing the water transport capacity of the gel, and having the function of stabilizing the carbon-based Chinese ink coating; overcoming the previous solar evaporation In the design, the solar energy loss is too large, and the evaporation energy is too low, so the evaporation rate is low.

Description

technical field [0001] The invention belongs to the technical field of preparation of photothermal evaporation materials, and in particular relates to a composite quaternary hydrogel capable of realizing high solar evaporation rate and a preparation method thereof. Background technique [0002] Fresh water is an indispensable resource for the development of human society today. With the development of human society and the advancement of science and technology, various industrial methods have been used to obtain fresh water resources. Due to the abundance of seawater resources on the earth, research and development are very important for desalination and utilization of seawater, and some achievements have been used in practical applications, such as osmosis and reverse osmosis based on separation methods, electric heating and direct heating based on evaporation law, which is widely used in the Middle East. To obtain fresh water of drinking-grade quality, evaporation-based ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/36C08L29/04C08L79/04C02F1/14
CPCC08J9/365C02F1/14C08J2329/04C08J2479/04Y02A20/212Y02A20/124Y02A20/142
Inventor 秦刚华申震厉宸希刘春红祁志福骆周扬雪小峰杜凤洋郭云龙鲍华
Owner ZHEJIANG ZHENENG TECHN RES INST
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