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Preparation method of humidity sensitive element humidity sensing membrane of humidity sensor

A technology of humidity sensor and humidity sensor, which is applied in the direction of instruments, alarms, material impedance, etc., can solve instability and other problems, and achieve the effects of good high humidity stability, small hysteresis, and excellent swelling resistance

Inactive Publication Date: 2006-06-28
SHANGHAI UNIV
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Problems solved by technology

Polymer electrolytes are good moisture-sensing materials for resistive humidity sensors, but since most polymer electrolytes are soluble in water, they are unstable at high humidity

Method used

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  • Preparation method of humidity sensitive element humidity sensing membrane of humidity sensor
  • Preparation method of humidity sensitive element humidity sensing membrane of humidity sensor

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Experimental program
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Embodiment 1

[0019] The body preparation process and steps in this embodiment are as follows:

[0020] (1) First prepare a binary grafting reaction reagent system. The components and molar concentrations of the reagents in the system are:

[0021] Acrylic acid 1.8mol / L

[0022] Sodium p-styrene sulfonate 0.7mol / L;

[0023] (2) Cut the high-density polyethylene film into a 3×6cm rectangle, scrub it with acetone, and then dry it in an oven at 50°C to a constant weight; put the weighed high-density polyethylene film into the polyethylene film Fill the bag with high-purity nitrogen, squeeze it many times to drive away the remaining air; after sealing, place it on a flatbed cart for dynamic electron beam irradiation, the electron beam intensity is 3mA, and the total irradiation dose is 200kGy ;

[0024] (3) The irradiated high-density polyethylene film and the polypropylene non-woven fabric of the backing material are stacked together, and then rolled into a cylindrical shape with a glass rod as th...

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Abstract

A method for preparing wet sensing film of wet sensitive element on humidity transducer includes preparing two element graft reaction reagent containing acrylic acid of 1.8 mol / L and p ¿C benzolypolate sodium of 0.7 mol / L, placing high density polyethylene film in polyethylene film bag for charging in nitrogen, sealing it for electronic irradiation with total dosage of 200 KGy, placing it in two element graft reaction liquid for reaction of 3 hr. at 60 deg.c. taking grafted film out and placing it in deionized water for 24 hr. at 70 deg.c then soaking it in hydrochloric acid for transformation.

Description

Technical field [0001] The invention relates to a method for preparing a moisture-sensing film of a humidity-sensitive element of a humidity sensor. It mainly adopts an electron beam-initiated pre-event radiation grafting method to prepare a polymer grafted polyethylene film, that is, a moisture-sensitive film, and belongs to the technical field and radiation of humidity sensor preparation. According to the technical field of grafting chemistry and chemical engineering. Background technique [0002] Humidity sensors that use high molecular polymers as humidity-sensing membranes can be roughly divided into two categories according to their detection mechanisms, namely impedance humidity sensors and capacitive humidity sensors. Polymer electrolytes are good moisture-sensing materials for making resistance-type humidity sensors, but since most polymer electrolytes are soluble in water, they are unstable under high humidity. For this reason, people have done a lot of work to improve ...

Claims

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Application Information

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IPC IPC(8): G01N27/12G01N27/02G08B21/20
Inventor 俎建华周瑞敏刘新文顾建忠吕森林郁春辉
Owner SHANGHAI UNIV
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