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A thermochromic hydrogel-type smart window and its preparation method, product and application

A thermochromic, hydrogel technology, applied in windows/doors, parallel glass structures, building components, etc., can solve problems such as affecting normal indoor lighting, sudden changes in light and temperature, and achieve a transition temperature that is suitable for human feeling and easy to manufacture. , the effect suitable for human feeling

Active Publication Date: 2022-05-27
QINGDAO UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventors found that: the original PNIPAM-based hydrogel only quickly becomes opaque when it reaches the LCST, and this fast and thorough response characteristic may cause sudden changes in light and temperature in practical applications, and at the same time affect the normal indoor lighting , which is a potential problem in smart windows

Method used

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  • A thermochromic hydrogel-type smart window and its preparation method, product and application
  • A thermochromic hydrogel-type smart window and its preparation method, product and application
  • A thermochromic hydrogel-type smart window and its preparation method, product and application

Examples

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Embodiment 1

[0040] According to Example 1 of the present invention, the change of light transmittance of Al-P(MACH-NIPAM) hydrogel during the heating process is gentle and continuous, while the light transmittance changes abruptly near LCST during the cooling process. There is a clear hysteresis separation between the heating and cooling cycle curves, and with the Al 3+ The more obvious the hysteresis phenomenon is when the concentration increases, such as image 3 .

[0041] According to embodiments of the present invention, Al-P(MACH-NIPAM) has excellent tensile properties. The tensile strength of the semi-dry 0.50Al-P(MACH-NIPAM) hydrogel can be as high as 1862.29 kPa, which is 6.9 times that of the P(MACH-NIPAM) hydrogel, and the elongation rate is 276.4%, which is 4.3 times higher.

[0042] According to an embodiment of the present invention, Al 3+ The compression resistance of Al-P(MACH-NIPAM) hydrogels is greatly improved. The compression ratio of each group of samples can reac...

Embodiment 2

[0061] The difference from Example 1 is that the replacement of CaCl is used. 2 Solution instead of AlCl 3 solution. The light transmittance of 0.5M Ca-P(MACH-NIPAM) hydrogel was 42% at 40℃, which was worse than 60% of Al-P(MACH-NIPA M) hydrogel. The tensile strength of the semi-dry 0.50Ca-P(MACH-NIPAM) hydrogel can be as high as 1251.23 kPa and the compressibility is 60%.

Embodiment 3

[0063] The difference from Example 1 is that instead of MgCl 2 Solution instead of AlCl 3solution. The transmittance of 0.5M Mg-P(MACH-NIPAM) hydrogel at 40°C is 44%, which is worse than 60% of Al-P(MACH-NIPAM) hydrogel. The tensile strength of the semi-dry 0.50Mg-P(MACH-NIPAM) hydrogel can be as high as 1384.53 kPa, and the compressibility is 56%.

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Abstract

The invention relates to a temperature-sensitive color-changing hydrogel-type smart window, a preparation method, a product and an application thereof, and belongs to the field of smart materials. The hydrogel of the invention has a suitable phase transition process and heat insulation and cooling effect, and the phase transition temperature range can be within 20°C to 70°C. The invention mainly uses maleic anhydride-modified chitosan, N-isopropylacrylamide (NIPAM) and cations of different valence states to prepare temperature-sensitive color-changing hydrogel. Maleylated chitosan introduces a double bond into the chitosan molecular chain, which not only serves as the first network structure, but also makes the double network structure firm during the later monomer polymerization process, has cross-linking effect, and improves gel stretchability , and increase the water solubility of chitosan. The intelligent temperature-sensitive window of the present invention can sense the temperature outside the window, and the temperature outside the window can control the light transmittance of the gel to reduce sunlight, thereby reducing the indoor temperature.

Description

technical field [0001] The invention belongs to the field of intelligent materials, and in particular relates to a preparation method of a thermochromic hydrogel type intelligent window. Background technique [0002] The disclosure of information in this Background section is only for enhancement of understanding of the general background of the invention and should not necessarily be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. [0003] Smart window mainly refers to a responsive window that can dynamically adjust the light transmittance and is constructed with color-changing materials as the main material. The energy used in buildings in developed countries accounts for 30-40% of the total energy consumption, even more than the energy consumption of industry or transportation, in which heating, ventilation and air conditioning systems contribute about 50% of building s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/44C08F251/00C08F220/54E06B3/67
CPCC08F8/44E06B3/6722C08F251/00C08F220/54
Inventor 刘建志刘月涛刘炳欣于跃芹武玉民
Owner QINGDAO UNIV OF SCI & TECH