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Formaldehyde gas-sensing material, corresponding formaldehyde gas-sensing element and preparation method of element

A production method and formaldehyde gas technology, applied in the direction of material resistance, etc., can solve the problems of high working temperature, difficulty in large-scale production, and complicated production process of gas sensor components, and achieve the effects of low cost, fast induction, and good flexibility resistance

Inactive Publication Date: 2014-06-18
惠州市富济电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above two formaldehyde gas sensors have the advantages of high sensitivity to formaldehyde gas, good anti-interference, short response time and recovery time, etc., the production process is complicated, the production conditions are harsh, and it is not easy to mass-produce, and the working temperature of the gas sensor is high. (260°C-300°C), there are also potential safety hazards

Method used

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  • Formaldehyde gas-sensing material, corresponding formaldehyde gas-sensing element and preparation method of element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) According to the ratio in the table, weigh each component to form a powder mixture:

[0039] Inorganic components SnO 2 In 2 o 3 WO 3 Pt PD CaO Content (wt%) 75 16 4 1 2 2 Particle size (nm) ≤80 ≤70 Median diameter (nm) ≤50 ≤50

[0040] Put the above 100 parts by mass of powder into 310 parts by mass of absolute ethanol solution, and stir with a stirrer at a speed of 200 r / min for 4 hours to obtain a uniformly mixed emulsion.

[0041] (2) Put the uniformly mixed emulsion into a low-temperature vacuum drying oven, and perform vacuum drying at 30°C to remove absolute ethanol.

[0042] (3) Weigh the inorganic powder and organic slurry carrier for gas-sensitive layer slurry according to the following ratio:

[0043] Based on 100 parts of dried inorganic powder, add 3.5 parts of hydrogenated castor oil, 43 parts of terpineol, 8.5 parts of polyvinyl butyral, and 6 parts of dibutyl phthalate, ...

Embodiment 2

[0047] (1) According to the ratio in the table, weigh each component to form a powder mixture:

[0048] Inorganic components SnO 2 In 2 o 3 WO 3 Pt PD CaO Content (wt%) 78 14 3 1.5 1.5 2 Particle size (nm) ≤80 ≤70 Median diameter (nm) ≤50 ≤50

[0049] Put 100 parts by mass of the mixture powder above into 310 parts by mass of anhydrous ethanol solution, and stir for 4 hours at a speed of 200 r / min with an electric stirrer to obtain a uniformly mixed emulsion.

[0050] Subsequent process steps are the same as in Example 1, and the formaldehyde gas sensor S2 is produced.

Embodiment 3

[0052] The preceding process steps are the same as in Example 1. In step (5), the laser sintering temperature is 520° C., and the sintering time is 0.16 h. After sintering, the required formaldehyde gas sensor S3 is obtained.

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Abstract

The invention relates to a formaldehyde gas-sensing material, a gas-sensing element and a preparation method of the element. The gas-sensing element comprises a gas-sensing layer, two layers of ceramic matrixes and a heating electrode, wherein the two layers of ceramic matrixes are used for bearing the gas-sensing layer, and the heating electrode is arranged between the two layers of ceramic matrixes. The gas-sensing material comprises 68-84wt% of SnO2, 10-30wt% of In2O3, 1-8wt% of WO3, 1-5% of Pt and / or Pd and 1-4wt% of CaO. The preparation method includes mixing the above substances in proportion and adding pulping materials for pulping, producing a ceramic heating element by the two layers of ceramic matrixes and the heating electrode, and arranging a sizing agent on the ceramic heating element in a printing, spraying or other mode to form the gas-sensing element. The formaldehyde gas-sensing element has the advantages of being low in response temperature, fast in induction, high in sensitivity, wide in measuring range, small in drifting of resistance in the air and good in flexing resistance; and simultaneously the preparation method of the element has the advantages of being simple, low in cost, small in size, and suitable for quantitative measurement devices and production of portable devices.

Description

technical field [0001] The invention relates to the field of gas sensors, in particular to a gas-sensitive material for testing the formaldehyde concentration in gas, a corresponding gas-sensitive element and a manufacturing method of the gas-sensitive element. Background technique [0002] Formaldehyde is a colorless, irritating gas with a strong odor, which can be combined with proteins. It has been identified as a class I carcinogen by the World Health Organization, and is considered to have a causal relationship with leukemia. After inhaling high-concentration formaldehyde, symptoms such as severe irritation of the respiratory tract, edema, eye irritation, and headache may occur, and bronchial asthma may also occur. Direct skin contact with formaldehyde can cause dermatitis, stains, and necrosis. Frequent inhalation of a small amount of formaldehyde can cause chronic poisoning, mucous membrane hyperemia, skin irritation, allergic dermatitis, keratosis and fragility of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
Inventor 胡延超陈彬
Owner 惠州市富济电子材料有限公司
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