Composite material with light transmittance changing along with humidity, preparation method of composite material and visual humidity-sensitive sensing film

A humidity change, composite material technology, applied in transmittance measurement, phase influence characteristic measurement, etc., can solve the problems of wearable clothing application with external wires, inflexibility, and few humidity sensors, and achieve the effect of visual monitoring

Active Publication Date: 2021-07-30
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the current humidity sensor can have multiple choices in sensitivity, responsiveness and response range, there are few flexible wearable and attachable humidity sensors based on fiber or textiles, and most of them are non-flexible.
In addition, in the preparation process, the conductive material and the moisture-sensitive material must be perfectly compounded, and there are problems such as complex preparation process, poor electrical stability, difficulty in applying external wires and other devices in wearable clothing, and the response process cannot pass through the color or transparency. Changes to directly visualize intelligent display and other issues limit its application in the field of intelligent sensing

Method used

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  • Composite material with light transmittance changing along with humidity, preparation method of composite material and visual humidity-sensitive sensing film
  • Composite material with light transmittance changing along with humidity, preparation method of composite material and visual humidity-sensitive sensing film
  • Composite material with light transmittance changing along with humidity, preparation method of composite material and visual humidity-sensitive sensing film

Examples

Experimental program
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preparation example Construction

[0036]The present invention also provides a preparation method of a composite material whose light transmittance changes with humidity, comprising the steps of:

[0037] S1. preparing a porous membrane substrate;

[0038] S2. The porous membrane base material prepared in step S1 is immersed in an organic acid solution for a preset time and then taken out to obtain a composite membrane material; specifically: prepare a certain mass fraction of an organic acid aqueous solution under acidic conditions and pour it into a petri dish Then cut the nanofiber film to a specific size (select the appropriate size according to the size of the petri dish), place it in an organic acid aqueous solution and soak it for a period of time, and take it out of the petri dish after the film is evenly infiltrated.

[0039] S3. Heat-treating the composite film material in step S2 to obtain a composite material whose light transmittance varies with humidity.

[0040] In step S1, the porous membrane s...

Embodiment 1-5

[0049] A composite material whose light transmittance changes with humidity is prepared by the following steps:

[0050] S1. Polyethylene-vinyl alcohol nanofibers (PVA-PE) were prepared by melt extrusion phase separation, and nanofiber suspensions were prepared into independent flexible nanofiber films by high-pressure spraying.

[0051] S2. Prepare 50ml of citric acid aqueous solution with a mass fraction of 15wt% under acidic conditions, pour it into a petri dish with an outer diameter of 9cm, and then cut the polyethylene-vinyl alcohol nanofiber film with a thickness of 30μm into a rectangle of 2cm*2cm , placed in citric acid aqueous solution for continuous soaking for 4 hours, and removed from the petri dish after the film was soaked evenly.

[0052] S3. The taken-out film is subjected to high-temperature treatment in different temperature environments for 3 minutes, and the composite film is obtained after drying.

[0053] The test humidity of the light transmittance in ...

Embodiment 6-10

[0062] A composite material whose light transmittance changes with humidity. Compared with Example 5, the difference is that the types of fibers and organic acids are shown in Table 2, and the others are the same as Example 5, and will not be repeated here.

[0063] Preparation conditions and performance test results of table 2 embodiment 6-10

[0064]

[0065]

[0066] It can be seen from Table 2 that the fiber substrate and the type of organic acid will have a certain impact on the tensile properties and optical transparency of the composite film.

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Abstract

The invention provides a composite material with light transmittance changing along with humidity, a preparation method of the composite material and a visual humidity-sensitive sensing film. The composite material comprises a porous base material and organic acid filled in pores of the porous base material. The organic acid is introduced into the microstructure pores of the porous base material, when the environmental humidity changes, reversible interaction occurs between water molecules and the organic acid, the refractive index between the organic acid and the porous base material is changed, and therefore the visual monitoring function on the environmental humidity is achieved. When the porous base material containing polar groups such as hydroxyl is a porous fiber film base material, the organic acid and the microstructure of the base material can be cross-linked and compounded, and the obtained composite film material is better in strength, adhesiveness and visualization performance and can be used in the field of visual intelligent humidity sensing.

Description

technical field [0001] The invention relates to the technical field of intelligent polymer materials, in particular to a composite material whose light transmittance changes with humidity, a preparation method thereof, and a visual humidity-sensitive sensing film. Background technique [0002] Human survival and social activities are closely related to humidity. Among various sensing devices, humidity sensors are widely used in many key scenarios, including human respiration monitoring, skin hydration monitoring, contact / non-contact water presence (such as diaper urine, etc.) liquid detection), wound treatment and healing. Traditional humidity sensors are usually composed of conductive electrodes and moisture-sensitive materials. When they interact with water molecules, they will cause electrical characteristics such as resistance or capacitance to change under different humidity or water content levels, and finally displayed in the form of electrical signals. Changes in am...

Claims

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Application Information

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IPC IPC(8): G01N21/59G01N21/41
CPCG01N21/59G01N21/41
Inventor 王栋王文向晨雪王双
Owner WUHAN TEXTILE UNIV
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