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A temperature-sensitive cellulose smart window

A cellulose and smart window technology, applied in shading screens and other directions, can solve problems such as uncertainty and complex control means, and achieve the effects of mild phase transition temperature control means, simple and rapid mixing process, and reduced visible light transmittance

Active Publication Date: 2022-02-11
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the decrease of temperature, the salting-out problem cannot be avoided; although chemical modification can obtain stable temperature-sensitive cellulose, the regulation methods are complex and full of uncertainties

Method used

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  • A temperature-sensitive cellulose smart window
  • A temperature-sensitive cellulose smart window
  • A temperature-sensitive cellulose smart window

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1) Dissolve 0.5 g of hydroxypropyl cellulose with a molecular weight of 100K in 100 mL of deionized water with a mass concentration of 0.5%, and stir slowly until the hydroxypropyl cellulose is completely dissolved and the solution is transparent to obtain a hydroxypropyl cellulose solution ;

[0043] 2) Add polyacrylic acid with a molecular weight of 3000 to the prepared hydroxypropyl cellulose solution, and control the mass ratio of hydroxypropyl cellulose / polyacrylic acid to 1:1 to obtain a mixed sol of hydroxypropyl cellulose / polyacrylic acid ;

[0044] 3) Add 5 mol / L hydrochloric acid to the mixed sol to adjust the pH value to 2.5.

[0045] Add the hydroxypropyl cellulose / polyacrylic acid mixed sol with a pH value of 2.5 into the middle of two pieces of glass, and seal the middle sol layer with a thickness of 0.5mm and an area of ​​30.5×26cm 2 The temperature-sensitive cellulose smart window.

[0046] The temperature-sensitive cellulose smart window prepared in ...

Embodiment 2

[0051] 1) Dissolve 0.4g of hydroxypropyl methylcellulose with a molecular weight of 100K in 100mL of deionized water with a mass concentration of 0.4%, and stir slowly until the cellulose is completely dissolved and the solution is transparent to obtain hydroxypropylmethylcellulose solution;

[0052] 2) Add sodium polyacrylate with a molecular weight of 5100 to the prepared cellulose solution, and control the mass ratio of hydroxypropyl methylcellulose / sodium polyacrylate to 1:0.5 to obtain hydroxypropyl methylcellulose / polyacrylate Sodium acrylate mixed sol;

[0053] 3) Add 4 mol / L hydrochloric acid to the above mixed sol to adjust the pH value to 2.5.

[0054] Add the hydroxypropyl methylcellulose / sodium polyacrylate mixed sol with a pH value of 2.5 into the middle of two pieces of glass, and seal the middle layer sol with a thickness of 0.5mm and an area of ​​30.5×26cm 2 The temperature-sensitive cellulose smart window.

[0055] Figure 5 The hydroxypropyl methylcellulo...

Embodiment 3

[0057] 1) Take 0.3 g of hydroxypropyl methylcellulose with a molecular weight of 100K and dissolve it in 100 mL of deionized water with a mass concentration of 0.3%, and stir slowly until the cellulose is completely dissolved and the solution is transparent to obtain hydroxypropyl methylcellulose ;

[0058] 2) Add potassium polyacrylate to hydroxypropyl methylcellulose solution, control the mass ratio of hydroxypropyl methylcellulose / potassium polyacrylate to 1:1, and obtain hydroxypropyl methylcellulose / potassium polyacrylate mixed sol;

[0059] 3) Add 3 mol / L hydrochloric acid to the above mixed sol to adjust the pH value to 2.5.

[0060] Add the hydroxypropyl methylcellulose / potassium polyacrylate mixed sol with a pH value of 2.5 into the middle of two pieces of glass, and seal the middle layer sol with a thickness of 0.5mm and an area of ​​30.5×26cm 2 The temperature-sensitive cellulose smart window.

[0061] Figure 6 The hydroxypropyl methylcellulose / potassium polyac...

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Abstract

The invention discloses a temperature-sensitive cellulose smart window. The specific preparation process is as follows: take a certain mass of temperature-sensitive cellulose and dissolve it in deionized water, stir slowly until it is completely dissolved, and the solution is transparent; polyacrylic acid and / or poly Add acrylate to the above cellulose solution to prepare temperature-sensitive cellulose / polyacrylic acid and / or polyacrylate mixed sol, then add acid or alkali to the mixed sol to adjust the pH value of the solution to regulate the minimum critical temperature to around room temperature, and finally The mixed sol is injected into the middle of two pieces of glass or flexible polymer films to seal the temperature-sensitive cellulose smart window with a sandwich structure.

Description

technical field [0001] The invention relates to the field of thermochromic smart windows, in particular to a temperature-sensitive cellulose smart window. Background technique [0002] Cellulose is a natural polymer, a renewable resource, non-toxic and biodegradable. In recent years, due to the demand for environmentally friendly, non-toxic and renewable materials in various countries, cellulose has been widely used in various fields, such as medicine, photothermal devices and food processing. Thermosensitive cellulose is a water-soluble cellulose ether with amphiphilic groups, which is mainly obtained through chemical modification of natural cellulose, and its main representatives are hydroxypropyl cellulose and hydroxypropyl methyl cellulose. When the ambient temperature is lower than the lowest critical temperature, the hydrophilic groups of thermosensitive cellulose will form a large number of hydrogen bonds with water molecules, the molecular chains stretch, and the so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/28C08L33/02C08J3/03E06B9/24
CPCC08J3/03E06B9/24C08J2301/28C08J2333/02C08J2433/02
Inventor 张良苗夏辉杜逸段玉娟高彦峰
Owner SHANGHAI UNIV