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Preparation method of green high polymer material for humidity sensor

A technology of humidity sensor and polymer materials, which is applied in the field of preparation of green polymer materials, can solve problems such as uneven deposition of polymer solutions, environmental pollution of synthetic polymer materials, excessive material dissipation, etc.

Pending Publication Date: 2022-04-26
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of uneven deposition of polymer solution, excessive material dissipation leading to obvious hysteresis phenomenon and certain environmental pollution of synthetic polymer materials when traditional methods are used to prepare green polymer materials for humidity sensors. , proposed a method for the preparation of green polymer materials for humidity sensors

Method used

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  • Preparation method of green high polymer material for humidity sensor

Examples

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Embodiment 1

[0036] This embodiment describes the preparation of a high-sensitivity and fast-response humidity sensor based on a green polymer material with a sensitivity of 24.3 Hz / %RH and a response time of 30 seconds. Further, the good hysteresis characteristics of the humidity sensor prepared in this example are described. During specific implementation, the preparation method of the humidity sensor based on the green polymer material, such as figure 1 shown.

[0037] The preparation method of the humidity sensor based on the green polymer material comprises the following steps:

[0038] Step 1, preparing microspheres, specifically includes the following sub-steps:

[0039] Step 1.1, at a suitable temperature, stir and dissolve the hydrophilic polymer in a certain mass concentration range into water to obtain a polymer solution;

[0040] The range of the suitable temperature is 5-80°C, the range of a certain mass concentration is 0.5% to 15%; the stirring speed is 20 rpm to 600 rpm;...

Embodiment 2

[0074] This embodiment illustrates the preparation of a humidity sensor by using a method for preparing a green polymer material for a humidity sensor according to the present invention.

[0075] During specific implementation, the steps are as shown in steps 1 to 7 in the summary of the invention.

[0076] Wherein, the hydrophilic polymer described in step 1 is preferably sodium alginate, polyglutamic acid or hyaluronic acid; the mass concentration of the hydrophilic polymer dissolved in water is preferably 1-6%;

[0077] The cross-linking agent described in step 2 is preferably calcium carbonate, calcium sulfate, calcium chloride, calcium gluconate, calcium phosphate, iron carbonate, iron chloride, iron sulfate; The quality of cross-linking agent in the cross-linking agent aqueous solution The concentration is preferably 10% to 25%, and the crosslinking agent aqueous solution accounts for 5% to 20% of the mass of the polymer solution;

[0078] The oil phase described in ste...

Embodiment 3

[0085] This example illustrates the process of applying this method to prepare a polymer material and a humidity sensor with a sensitivity of 50 Hz / %RH and a response time of 35 seconds.

[0086] At 40°C, dissolve 0.4 grams of sodium alginate in 20 grams of water, stir at a speed of 200 rpm to completely dissolve the hydrophilic polymer; then dissolve 0.3 grams of calcium carbonate crosslinking agent in 3 grams of water, Add together in the compound solution and continue to stir for 15 minutes; Then add 100 grams of castor oil and 0.6 gram of Span 80, stir for 15 minutes with a stirring speed of 600 rev / min, form a uniform and stable emulsion; add 1 gram of glacial acetic acid again, Continue to stir for 60 minutes; centrifuge the polymer emulsion at a speed of 3000 / min to obtain cross-linked microsphere solids; then wash and precipitate the microsphere solids in 100 grams of ethanol solution; then pump the precipitates with medium-speed filter paper Filter and dry to obtain m...

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Abstract

The invention relates to a preparation method of a green high polymer material for a humidity sensor, and belongs to the technical field of preparation and application of high polymer materials. The method comprises the following steps: dissolving a hydrophilic polymer into water at a proper temperature, and stirring to obtain a polymer solution; adding a cross-linking agent aqueous solution into the polymer solution, stirring, adding an oil phase accounting for the polymer solution and an emulsifier, and stirring to form a uniform and stable emulsion; adding an acidic compound into the emulsion, and continuously stirring to obtain a polymer emulsion; centrifuging the polymer emulsion to obtain a cross-linked microsphere solid; washing and precipitating the microsphere solid in ethanol, carrying out suction filtration with filter paper, and drying to obtain microspheres; dispersing the microspheres into the deposition liquid, and filtering the deposition liquid through a filter head to obtain filtrate; coating the surface of a quartz crystal microbalance with the filtrate to prepare a humidity sensor; the method is mild in reaction condition in the preparation process, the raw materials are derived from natural polymers, green, environment-friendly, recyclable and degradable, and the prepared humidity sensor is high in sensitivity and quick in response.

Description

technical field [0001] The invention relates to a method for preparing a green polymer material used for a humidity sensor, and belongs to the technical field of polymer material preparation and application. Background technique [0002] Humidity sensors are widely used in aerospace, healthcare, industrial process control, agricultural production, and food storage, and are playing an increasingly important role in these fields. For example: For the human body, the optimum humidity range is 45%-60 / %RH. Humidity control is required in both the operating room and the monitoring room. For precious cultural relics, high humidity can lead to mold growth, and low humidity can cause paper to dry out. There are three main types of humidity sensors: resistive humidity sensors, capacitive humidity sensors, and mass-frequency humidity sensors. The existing humidity detection can play a certain role, but it is necessary to further develop a humidity sensor with higher performance, mor...

Claims

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Application Information

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IPC IPC(8): G01N29/02C09D105/04C09D177/04C09D105/08C09D101/28C09D7/61C09D7/63B01J13/22
CPCG01N29/022C09D105/04C09D177/04C09D105/08C09D7/61C09D7/63G01N2291/02845C08K3/011C08K5/0025C08L5/08C08L1/286C08L77/04
Inventor 陈煜杨珏莹冯立辉冯立颖赵琳杜乐何鸿丞卢继华
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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