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Preparation of conductive polyurethane film and application thereof to capacitive pressure sensor

A technology of polyurethane film and polyurethane prepolymer, which is applied in the field of electronic information, can solve the problems such as the inability to uniformly prepare SiC film in a large area, and achieve the effects of long service life, high efficiency and easy operation.

Inactive Publication Date: 2013-04-10
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these thin films made of SiC are prepared by methods such as chemical vapor deposition, molecular beam epitaxy, and sublimation growth, which cannot uniformly prepare SiC thin films on a large area.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0022] The invention discloses a method for preparing a conductive polyurethane film. The preparation method uses carbon nanotubes with hydroxyl groups after chemical modification to participate in the reaction of polyurethane prepolymers composed of polyether polyols, isocyanates and catalysts. includes the following steps,

[0023] a Preparation of polyurethane prepolymer

[0024] Parts by mass are:

[0025] 5-20 parts of isocyanate

[0026] Polyether polyol 30~80 parts

[0027] Catalyst 0.01~0.1 parts

[0028] Add it into a four-port reaction kettle with a high-purity nitrogen gas with a purity equal to or higher than 99.999%, and heat and stir for 1.5 to 3 hours. The reaction temperature is 65 to 70 ° C, forming For polyurethane prepolymer, high-purity nitrogen is used as a protective gas to prevent air from entering the reaction and destroying the synthesis of the prepolymer. The agitator is used to mix the raw materials evenly. The condenser tube is used to allow the...

Embodiment 1

[0036] 1 Preparation of polyurethane prepolymer

[0037] Parts by mass are:

[0038] 5 parts of 4,4' diphenylmethane diisocyanate

[0039] Polytetrahydrofuran 30 parts

[0040] Di-n-butyltin dilaurate 0.01 parts

[0041] Add it into a four-port reaction kettle with a high-purity nitrogen gas with a purity equal to or higher than 99.999%, and a four-port reaction kettle with a stirrer, a thermometer, and a condenser, heat and stir for 1.5 hours, and the reaction temperature is 65°C to form a polyurethane prepolymer ,

[0042] The molecular weight of the polytetrahydrofuran is 2000.

[0043] 2 Preparation of conductive polyurethane film

[0044] The chemically modified carbon nanotubes with hydroxyl groups are dissolved in N-methylpyrrolidone solvent at 0.1 parts by mass, and are dissolved until completely dispersed after ultrasonication to obtain a carbon nanotube solution. The solution is added to the polyurethane prepolymer according to the mass fraction of the polyuret...

Embodiment 2

[0046] 1 Preparation of polyurethane prepolymer

[0047] Parts by mass are:

[0048] 4,4' diphenylmethane diisocyanate 10 parts

[0049] Polytetrahydrofuran 45 parts

[0050] Di-n-butyltin dilaurate 0.02 parts

[0051] Add it to a four-port reaction kettle with high-purity nitrogen with a purity equal to or higher than 99.999%, and a four-port reaction kettle with a stirrer, a thermometer, and a condenser, heat and stir for 2 hours, and the reaction temperature is 65°C to form a polyurethane prepolymer.

[0052] The molecular weight of the polytetrahydrofuran is 2000.

[0053] 2 Preparation of conductive polyurethane film

[0054] Dissolve the chemically modified carbon nanotubes with hydroxyl groups in 3 parts by mass in N-methylpyrrolidone solvent, and dissolve them to complete dispersion after ultrasonication to obtain a carbon nanotube solution. The solution is added to the prepolymer of polyurethane according to the mass fraction of the polyurethane prepolymer as 5 p...

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Abstract

The invention relates to a preparation of a conductive polyurethane film and an application thereof to a capacitive pressure sensor, and belongs to the technical field of electronic information. A CNT (carbon nano tube) subjected to chemical modification and provided with a hydroxyl group is adopted to participate in the synthesis of a polyurethane prepolymer, so that synthetized modified polyurethane has electrical conductivity; the modified polyurethane is subjected to a film forming technology to form conductive polyurethane films; and the conductive polyurethane films not only solve the problem that the conventional conductive polyurethane film is non-conductive, but also retain the satisfactory performance such as high elasticity, and can be produced on a large scale. The conductive polyurethane films are applicable to two electrodes in capacitive pressure sensors, and are high in electron emission efficiency, good in stability and long in service life; and when external forces are applied on the surface layers of the sensors, the non-conductive conductive polyurethane film between the capacitive pressure sensors enables the distance between a cathode and an anode to be changed, and the current displayed in a microampere meter is also changed, that is, the current value of the microampere meter is characterized as a pressure value between the capacitive pressure sensors.

Description

technical field [0001] The invention relates to the preparation of a conductive polyurethane film and its application in a capacitive pressure sensor, belonging to the technical field of electronic information. Background technique [0002] Polyurethane is a polymer made of polyisocyanate and polyether polyol or polyester polyol or small molecule polyol, polyamine or water and other chain extenders or crosslinking agents. It is a new type of organic polymer material with high wear resistance and impact resistance. By changing the type and composition of raw materials, the shape and performance of the product can be easily and greatly changed, and the final product can be obtained from soft to hard. Currently, a pressure sensor is a sensor that senses pressure and converts it into a usable output signal. Although the film made of polyurethane material has the characteristics of wear resistance and softness, it is not conductive, so it is not suitable to apply pure polyureth...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L75/08C08G18/76C08G18/66C08G18/48C08G18/10C08G18/28G01L1/14
Inventor 王栋李海英李沐芳赵青华陆莹蒋海青
Owner WUHAN TEXTILE UNIV
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