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Fiber-based humidity sensor based on moisture absorption and color change, and preparation method thereof

A technology of humidity sensor and moisture-absorbing discoloration, which is applied in the direction of nanotechnology for sensing, fiber treatment, fiber type, etc., can solve the problems of difficult to realize the transformation of multiple colors, heavy metal residues, and affecting the safety of fiber use, and achieve high Practical application value, improvement of dispersibility, improvement of sensitivity and effect of service life

Active Publication Date: 2021-06-15
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method requires the use of a complex of cobalt chloride and hexamethylenetetramine as a moisture-sensitive color-changing powder. Even if it is made into a microcapsule structure, there is still the problem of heavy metal residues in the long-term use process, which affects the fiber. It is safe to use; and the color change of the hygroscopic chromogenic fiber prepared by this method is limited to changing from purple to pink, and it is difficult to realize the transformation of multiple colors

Method used

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  • Fiber-based humidity sensor based on moisture absorption and color change, and preparation method thereof
  • Fiber-based humidity sensor based on moisture absorption and color change, and preparation method thereof
  • Fiber-based humidity sensor based on moisture absorption and color change, and preparation method thereof

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preparation example Construction

[0034] The invention provides a method for preparing a fiber-based humidity sensor based on hygroscopic discoloration, comprising the following steps:

[0035] S1. Prepare silica nano-microspheres, and modify the silica nano-microspheres with an aminosilane coupling agent; after the reaction is sufficient, centrifuge, wash, and disperse to obtain modified silica nano-microspheres ball suspension;

[0036]S2. Prepare polyvinyl alcohol spinning solution and carbon nanotube solution with preset concentrations respectively, and then mix the polyvinyl alcohol spinning solution and the carbon nanotube solution to prepare polyvinyl alcohol / carbon nanotube spinning solution ; Add a predetermined amount of glutaraldehyde to the polyvinyl alcohol / carbon nanotube spinning solution, and after fully reacting, obtain a modified polyvinyl alcohol / carbon nanotube spinning solution;

[0037] S3, performing wet spinning on the modified polyvinyl alcohol / carbon nanotube spinning solution obtain...

Embodiment 1

[0048] This embodiment provides a method for preparing a fiber-based humidity sensor based on hygroscopic discoloration, including the following steps:

[0049] S1. Take 16mL of ethanol, 25mL of deionized water, and 2mL of ammonia water with a concentration of 25%, and add them to a single-necked round-bottomed flask respectively. After sealing with a glass stopper, adjust the magnetic stirring speed to 1000rpm and stir thoroughly; Pour tetraethyl ester into a beaker containing 45ml of ethanol and stir evenly; then drain the solution in the beaker into a round-bottomed flask with a glass rod, and adjust the magnetic stirring speed to 600rpm when the solution is completely reacted to milky white. Stir in a water bath at constant temperature for 8 hours, centrifuge and wash with ethanol three times after the reaction is complete, and disperse the obtained silica nanospheres in ethanol to obtain a suspension of silica nanospheres with a solid content of 1.5%.

[0050] Take 47mL o...

Embodiment 2～4

[0056] Embodiments 2 to 4 respectively provide a method for preparing a fiber-based humidity sensor based on hygroscopic discoloration. Compared with Embodiment 1, the difference is that the volume ratio of ammonia water and tetraethyl orthosilicate in step S1 and the reaction temperature, modified silica nanospheres with different particle diameters were obtained, and the preparation parameters and particle diameters of the modified silica nanospheres corresponding to each embodiment are shown in Table 1. The remaining steps of Embodiments 2-4 are consistent with Embodiment 1, and will not be repeated here.

[0057] The volume ratio of ammonia water and tetraethylorthosilicate and the particle size of the modified silica nanospheres prepared therein in Table 1 Examples 2 to 4

[0058]

[0059] Wherein, the fiber-based humidity sensor based on hygroscopic discoloration prepared in embodiment 1 and embodiment 2 is respectively as follows figure 2 In a, b shown. Depend on ...

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Abstract

The invention provides a fiber-based humidity sensor based on moisture absorption and color change, and a preparation method thereof. The method comprises the following steps: preparing silicon dioxide nano-microspheres, and modifying the silicon dioxide nano-microspheres by adopting an amino silane coupling agent to obtain a modified silicon dioxide nano-microsphere suspension; adding glutaraldehyde into a polyvinyl alcohol / carbon nanotube spinning solution for crosslinking modification to obtain a modified polyvinyl alcohol / carbon nanotube spinning solution; and performing wet spinning, dipping the obtained modified polyvinyl alcohol / carbon nanotube fiber in the modified silicon dioxide nano-microsphere suspension to obtain the fiber-based humidity sensor based on moisture absorption and color change. Through the mode, the prepared modified polyvinyl alcohol / carbon nanotube fiber has moisture absorption expansibility under wet stimulation, so that the silicon dioxide nano-microspheres loaded on the surface of the fiber change the distribution state under the wet stimulation and show color change, and the moisture absorption and color change effects are achieved; therefore, the application requirements of the fiber-based humidity sensor are met.

Description

technical field [0001] The invention relates to the technical field of humidity sensors, in particular to a fiber-based humidity sensor based on hygroscopic discoloration and a preparation method thereof. Background technique [0002] The rapid development of science and technology and the continuous progress of human society have brought opportunities and challenges to the traditional textile industry. Traditional fibers can no longer meet the needs of the public, and people have higher and higher requirements for the functionalization and intelligence of materials. Smart fibers have become a hot field of exploration and research by scholars from all over the world. Smart fiber is a fiber that integrates perception, drive and information processing, similar to biological materials, and has intelligent functions such as self-sensing, self-adaptation, self-diagnosis, and self-repair. Since smart fibers have the ability to sense and respond to external stimuli (such as mechan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25B82Y15/00B82Y40/00D06M11/79D01F6/50D01F1/10D06M101/24
CPCG01N21/25B82Y15/00B82Y40/00D06M11/79D01F6/50D01F1/10D06M2101/24
Inventor 王栋陈佳慧许梦缘李沐芳梅涛
Owner WUHAN TEXTILE UNIV
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