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A kind of lignin fiber humidity sensor and preparation method thereof

A technology of lignin fiber and humidity sensor, applied in the direction of material resistance, can solve the problems of unenvironmental protection, long response and recovery time of humidity sensor, long response and recovery time, etc., to achieve low production cost, fast humidity response, high price low cost effect

Active Publication Date: 2021-05-07
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the detectable humidity range is only 35% to 85%, and the response and recovery time is too long. Secondly, the preparation process uses toxic solvents, which is not environmentally friendly.
[0006] To sum up, at present, the use of biomass materials to prepare humidity sensors is one of the solutions to reduce the manufacturing cost of humidity sensors, but the humidity sensors made of biomass materials have the problem of long response and recovery time.

Method used

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  • A kind of lignin fiber humidity sensor and preparation method thereof
  • A kind of lignin fiber humidity sensor and preparation method thereof
  • A kind of lignin fiber humidity sensor and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0028] A preparation method of a lignin fiber humidity sensor, the method comprising the following steps:

[0029] (1) polyvinyl alcohol (PVA) is dissolved in deionized water and is mixed with the PVA solution that the mass fraction is 10%, then mixes with sodium lignosulfonate and is dissolved in the acetic acid solution and is formulated with the spinning solution that the mass fraction is 25% .

[0030] (2) Take 2 mL of the spinning solution obtained in step (1) and perform electrospinning to obtain a lignin fiber membrane. The process conditions of electrospinning are: the distance between the spinneret of the electrospinning device and the fiber receiving device is 10cm, the spinneret is 25G, the voltage of the high-voltage electrostatic generator is 15kV, and the feed rate of the electrospinning solution is 0.1 mL / h.

[0031] (3) Preparation of silver nanowire dispersion: Add 0.1g of polyvinylpyrrolidone (PVP) to 10mL of ethylene glycol, dissolve it completely by magne...

Embodiment 2

[0034] A preparation method of a lignin fiber humidity sensor, the method comprising the following steps:

[0035] (1) Polyvinyl alcohol (PVA) is dissolved in deionized water and is mixed with the PVA solution that the mass fraction is 10%, then mixes with sodium lignosulfonate and is dissolved in the acetic acid solution and is formulated with the spinning solution that the mass fraction is 40% .

[0036] (2) Take 2 mL of the spinning solution obtained in step (1) and perform electrospinning to obtain a lignin fiber membrane. The process conditions of electrospinning are: the distance between the spinneret of the electrospinning device and the fiber receiving device is 20cm, the spinneret is 28G, the voltage of the high-voltage electrostatic generator is 25kV, and the feed rate of the electrospinning liquid is 1.0 mL / h.

[0037] (3) Preparation of silver nanowire dispersion: Add 0.3g of polyvinylpyrrolidone (PVP) to 30mL of ethylene glycol, dissolve it completely by magneti...

Embodiment 3

[0040] A preparation method of a lignin fiber humidity sensor, the method comprising the following steps:

[0041] (1) polyvinyl alcohol (PVA) is dissolved in deionized water and is mixed with the PVA solution that the mass fraction is 10%, then mixes with sodium lignosulfonate and is dissolved in the acetic acid solution and is formulated with the spinning solution that the mass fraction is 35% .

[0042] (2) Take 2 mL of the spinning solution obtained in step (1) and perform electrospinning to obtain a lignin fiber membrane. The process conditions of electrospinning are: the distance between the spinneret of the electrospinning device and the fiber receiving device is 18cm, the spinneret is 26G, the voltage of the high-voltage electrostatic generator is 22kV, and the feed rate of the electrospinning solution is 0.7 mL / h.

[0043] (3) Preparation of silver nanowire dispersion: Add 0.5g of polyvinylpyrrolidone (PVP) to 25mL of ethylene glycol, dissolve it completely by magne...

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Abstract

The invention discloses a lignin fiber humidity sensor and a preparation method thereof. In the method, sodium lignosulfonate is prepared into a lignin fiber film by electrospinning, and then nano-silver wire is coated on the surface thereof, and the lignin fiber Changes in conductivity after water absorption and swelling, applied to humidity sensors. The humidity sensor prepared by this method has a lignin fiber humidity-sensitive component, which can respond quickly to the environmental humidity. Compared with the humidity sensor prepared by other biomass materials, the humidity sensor prepared by this method has shorter response and recovery time . The invention adopts rich sources of raw materials, low production cost, simple and easy preparation process, safety and environmental protection, and simultaneously opens up a new idea for high-value utilization of lignin, and has practical application and economic value.

Description

technical field [0001] The invention belongs to the technical field of biomass material processing, and in particular relates to a method for preparing a humidity sensor by using lignin. Background technique [0002] Humidity sensors are widely used in industry, agriculture, and human daily life. The humidity-sensitive materials used in traditional humidity sensors are metal oxides and polymer films, which are costly and not environmentally friendly. [0003] Lignin is the second largest renewable natural polymer after cellulose in the plant kingdom. It contains a variety of functional groups. Industrial lignin is mainly derived from pulping black liquor in the paper industry or by-products of bioethanol production. The world's paper industry produces about 50 million tons of lignin every year, 90% of which is concentrated by the alkali recovery system and then incinerated for steam and power generation, failing to realize the high-value utilization of lignin. [0004] Chin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12G01N27/04
Inventor 闵斗勇郭晨艳陈昌洲马海茼张清桐罗斌运晓静迟明超王双飞
Owner GUANGXI UNIV