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A kind of sealing material for sensor and preparation method thereof

A sealing material and sensor technology, applied in chemical instruments and methods, other chemical processes, non-polymer adhesive additives, etc., can solve problems such as poor insulation, insulation resistance, decrease in bonding strength and stiffness, and sensor zero drift , to achieve the effects of excellent high temperature and high humidity resistance, excellent salt spray resistance and excellent mechanical properties

Active Publication Date: 2021-02-19
广州从化兆舜新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Protection and sealing are the key processes in the manufacturing process of the load cell. The protection and sealing effect of the sensor is not good. The resistance strain gauge and the strain adhesive will easily absorb moisture in the air, which is likely to cause conduction between the wire grids of the strain gauge. At the same time, it may also cause the size of the substrate of the pasted strain gauge, the bonding layer between the wire grid and the substrate to change, resulting in a decrease in insulation resistance, bonding strength and stiffness, and a change in the resistance value of the strain gauge. Cause zero drift of the sensor, poor insulation or even make the sensor invalid, so the sensor must be effectively protected and sealed to improve the performance of the load cell against moisture, water, enzymes, salt spray, etc., as well as the ability to resist vibration and shock. Further increase the service life of the sensor

Method used

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  • A kind of sealing material for sensor and preparation method thereof
  • A kind of sealing material for sensor and preparation method thereof
  • A kind of sealing material for sensor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A method for preparing a sealing material for a sensor, said method comprising the following steps:

[0047] (1) Add 50g Al 2 o 3 Mix it with 100 g of alkoxy-terminated polydimethylsiloxane, and stir and defoam at 180° C. under a vacuum degree of -0.10 MPa for 2 hours to obtain the first mixture;

[0048] (2) Mix the first mixture obtained in step (1) with 15 g of a cross-linking agent, and stir and defoam at 30° C. under a vacuum degree of -0.10 MPa for 10 minutes to obtain a second mixture;

[0049] (3) Mix the second mixture obtained in step (2) with 5g of γ-(2,3-glycidoxy)propyltrimethoxysilane and 5g of catalyst, and stir and defoam at 30°C under vacuum degree -0.10MPa for 30min Obtain the sealing material.

[0050] Wherein, the structural formula of cross-linking agent is (CH 3 O) 3 SiCH 2 CH 2 Si(CH 3 O) 3 , the structural formula of the catalyst is Ti[(OSi(CH 3 ) 2 ) 1000 OSi(CH 3 ) 3 ] 4 .

Embodiment 2

[0052] A method for preparing a sealing material for a sensor, said method comprising the following steps:

[0053] (1) 100g SiO 2 Mix it with 50 g of alkoxy-terminated polydimethylsiloxane, stir and defoam at 105° C. under a vacuum of -0.08 MPa for 6 hours to obtain the first mixture;

[0054] (2) Mix the first mixture obtained in step (1) with 5 g of cross-linking agent, and stir and defoam at 10° C. under a vacuum degree of -0.08 MPa for 30 minutes to obtain the second mixture;

[0055] (3) The second mixture obtained in step (2) was mixed with 0.1 g of γ-aminopropyltrimethoxysilane and 0.1 g of catalyst, stirred and degassed at 10° C. for 90 minutes under a vacuum degree of -0.08 MPa to obtain the sealing material.

[0056] Wherein, the structural formula of cross-linking agent is (CH 3 CH 2 O) 3 SiCH 2 CH 2 CH 2 Si(OCH 2 CH 3 ) 3 , the structural formula of the catalyst is Ti[O(C 3 h 6 O) 50 (C 2 h 4 O) 50 H][(OSi(CH 3 ) 2 ) 50 OSi(CH 3 ) 3 ] 3 .

Embodiment 3

[0058] A method for preparing a sealing material for a sensor, said method comprising the following steps:

[0059] (1) 60g SiO 2 Mix it with 90g of alkoxy-terminated polydimethylsiloxane, stir and defoam at 150°C under a vacuum of -0.09MPa for 4h to obtain the first mixture;

[0060] (2) Mix the first mixture obtained in step (1) with 10 g of cross-linking agent, and stir and defoam at 20° C. under a vacuum degree of -0.09 MPa for 20 minutes to obtain the second mixture;

[0061] (3) The second mixture obtained in step (2) was mixed with 2 g of γ-aminopropyltrimethoxysilane and 2 g of catalyst, and stirred and degassed at 20° C. for 60 minutes under a vacuum degree of -0.09 MPa to obtain the sealing material.

[0062] Wherein, the structural formula of cross-linking agent is (CH 3 O) 3 SiCH 2 CH 2 CH 2 CH 2 Si(OCH 2 CH 3 ) 3 , the structural formula of the catalyst is Ti[O(C 3 h 6 O) 200 (C 2 h 4 O) 200 H] 2 [(OSi(CH 3 ) 2 ) 500 OSi(CH 3 ) 3 ] 2 .

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Abstract

The invention provides a sensor sealing material and a preparation method thereof. The sealing material comprises an alkoxy-terminated polydimethylsiloxane, a filler, a crosslinking agent, a coupling agent and a catalyst. The sealing material has excellent sealing performance, excellent mechanical performance, high temperature and high humidity resistance and salt spray resistance, has little influence on the electrical performance of the sensor, basically has no electromagnetic interference, and has excellent insulation performance, so that the sensing material can maintain a high The sensitivity and stable signal can improve the qualified rate of sensor products in production.

Description

technical field [0001] The invention belongs to the field of sealing materials, and relates to a sealing material for sensors and a preparation method thereof. Background technique [0002] Protection and sealing are the key processes in the manufacturing process of the load cell. The protection and sealing effect of the sensor is not good. The resistance strain gauge and the strain adhesive will easily absorb moisture in the air, which is likely to cause conduction between the wire grids of the strain gauge. At the same time, it may also cause the size of the substrate of the pasted strain gauge, the bonding layer between the wire grid and the substrate to change, resulting in a decrease in insulation resistance, bonding strength and stiffness, and a change in the resistance value of the strain gauge. Cause zero drift of the sensor, poor insulation or even make the sensor invalid, so the sensor must be effectively protected and sealed to improve the performance of the load ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J183/04C09J11/04C09J11/06C09K3/10
CPCC08K3/36C08K5/5419C08K5/5435C08K5/544C08K2003/2227C08K2003/2241C09J11/04C09J11/06C09J183/04C09K3/10
Inventor 翁祝强周君东胡国新李明增黄永军刘金明赵应岩孙鹏
Owner 广州从化兆舜新材料有限公司
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