Composite material whose light transmittance changes with humidity and its preparation method and visual humidity-sensitive sensing film

Abstract

The invention provides a composite material whose light transmittance changes with humidity, a preparation method thereof and a visual humidity sensitive film. The composite material includes a porous substrate and an organic acid filled in the pores of the porous substrate. The organic acid is introduced into the microstructure pores of the porous substrate. When the environmental humidity changes, the reversible interaction between the water molecules and the organic acid will cause the refractive index between the organic acid and the porous substrate to change, thereby achieving Visual monitoring function of environmental humidity. When the porous substrate containing polar groups such as hydroxyl groups is a porous fiber membrane substrate, the microstructure of the organic acid and the substrate can be cross-linked and compounded, and the obtained composite membrane material has better strength, adhesion and visualization properties. It can be used in the field of visual intelligent humidity sensing.

Description

Composite material whose light transmittance varies with humidity and its preparation method and visualized humidity-sensitive transmission film technical field The present invention relates to the technical field of intelligent polymer materials, in particular to a composite material whose light transmittance varies with humidity A material and a preparation method thereof, and a visual humidity-sensitive sensing film. Background technique Human survival and social activities are closely related to humidity. Among various sensing devices, humidity sensors are widely used. Used in many key scenarios, including human respiration monitoring, skin hydration monitoring, contact / non-contact water presence (such as diapers) urine testing), wound treatment and healing. Traditional humidity sensors are usually composed of conductive electrodes and humidity-sensitive materials. When it interacts with water molecules it results in electrical properties such as resistance or...

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

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