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Preparation method of polyvinylidene-fluoride-base temperature-sensitive resistance material with negative temperature coefficient effect

A polyvinylidene fluoride, negative temperature coefficient technology, applied in the direction of resistors with negative temperature coefficient, can solve the problems of low sensitivity, high filling amount of conductive phase, large room temperature resistivity, etc., to achieve low room temperature resistivity, high Effect of polymer-based negative temperature coefficient strength, simple temperature measurement

Inactive Publication Date: 2012-11-28
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the current situation of high conductive phase filling, high room temperature resistivity and low sensitivity of existing polymer-based temperature-sensitive materials, and propose a polyvinylidene fluoride-based temperature-sensitive material with a negative temperature coefficient effect. Preparation method of resistive material

Method used

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  • Preparation method of polyvinylidene-fluoride-base temperature-sensitive resistance material with negative temperature coefficient effect
  • Preparation method of polyvinylidene-fluoride-base temperature-sensitive resistance material with negative temperature coefficient effect
  • Preparation method of polyvinylidene-fluoride-base temperature-sensitive resistance material with negative temperature coefficient effect

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specific Embodiment approach 1

[0023] Specific Embodiment 1: The preparation method of the polyvinylidene fluoride-based thermistor material with negative temperature coefficient effect in this embodiment is realized according to the following steps:

[0024] 1. Using graphite powder as raw material, the improved Hummers method is used to prepare graphite oxide;

[0025] 2. Add the graphite oxide prepared in step 1 to N,N-dimethylformamide, and disperse it ultrasonically for 1~3h to obtain N,N-dimethylformamide of graphene oxide with a concentration of 0.1~1.0mg / mL Formamide dispersion Ⅰ;

[0026]3. Add 5~200mg of initiator azobisisobutyronitrile, 0.1~5g of sodium p-styrenesulfonate and 20~100mL of N,N-dimethylformaldehyde of graphene oxide prepared in step 2 in the four-necked bottle Amide dispersion I, and then pass inert protective gas into the four-necked bottle for 10~30min, then heat to 60~80℃ in a water bath under magnetic stirring, continue to react for 6~24h, and then use a microporous filter with...

specific Embodiment approach 2

[0030] Embodiment 2: This embodiment differs from Embodiment 1 in that: in step 2, N, N-dimethylformamide dispersion I of graphene oxide with a concentration of 0.3-0.8 mg / mL is obtained. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0031] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step three, add initiator azobisisobutyronitrile 10 ~ 100mg, sodium p-styrene sulfonate 1 ~ 4g and 30-90 mL of graphene oxide N,N-dimethylformamide dispersion I prepared in step 2. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to a preparation method of a polyvinylidene-fluoride-base temperature-sensitive resistance material, particularly a preparation method of a polyvinylidene-fluoride-base temperature-sensitive resistance material with negative temperature coefficient effect. The invention aims to solve the problems of high conductive phase filling amount, high room-temperature resistivity and low sensitivity in the existing polymer-base temperature-sensitive material. The preparation method comprises the following steps: (1) preparing graphite oxide from the raw material graphite powder by an improved Hummers process; (2) preparing a graphene oxide N,N-dimethylformamide dispersion solution I; (3) preparing modified graphene (poly(sodium-p-styrenesulfonate)grafted graphene or nanosilver-supported graphene); and (4) preparing the polyvinylidene-fluoride-base composite material using the modified graphene as the conductive filler. The invention is applicable to the field of preparation of polyvinylidene-fluoride-base temperature-sensitive resistance materials.

Description

technical field [0001] The invention relates to a preparation method of a polyvinylidene fluoride-based temperature-sensitive resistance material. Background technique [0002] Polymer-based negative temperature coefficient (NTC) thermistor materials are a new class of functional materials with important theoretical research value and extremely broad application prospects. It is a multi-phase composite system formed by polymer material as the matrix, adding conductive fillers such as carbon black, metal powder, and metal oxide, and processed by dispersion compounding and lamination compounding. and reduced characteristics. NTC temperature sensitive resistors are mainly used for temperature measurement and temperature compensation of electronic circuits, and have been widely used in temperature sensing and control of household appliances, automobiles and industrial production equipment. Because the raw materials of polymer-based NTC materials are easy to obtain, cheap, easy...

Claims

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Application Information

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IPC IPC(8): C08L27/16C08K9/04C08K3/04C08K9/12C08K3/08C08F292/00C08F8/30H01C7/04
Inventor 宋英孙秋刘福李存梅王福平
Owner HARBIN INST OF TECH
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