Unlock instant, AI-driven research and patent intelligence for your innovation.

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, etc., can solve the problems of high room temperature resistivity, high filling amount of conductive phase, low sensitivity, etc., to achieve low room temperature resistivity, high Effect of polymer-based negative temperature coefficient strength, simple temperature measurement

Inactive Publication Date: 2014-01-22
HARBIN INST OF TECH
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0025] 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:

[0026] 1. Using graphite powder as raw material, the improved Hummers method is used to prepare graphite oxide;

[0027] 2. Add the graphite oxide prepared in step 1 to N,N-dimethylformamide, and disperse it ultrasonically for 1-3 hours to obtain N,N-dimethylformamide of graphene oxide with a concentration of 0.1-1.0 mg / mL Formamide dispersion Ⅰ;

[0028] 3. Add 5-200 mg of initiator azobisisobutyronitrile, 0.1-5 g of sodium p-styrene sulfonate and 20-100 mL of N,N-dimethylformaldehyde of graphene oxide prepared in step 2 into a four-necked bottle Amide dispersion I, and then pass an inert protective gas into the four-neck bottle for 10-30 minutes, heat it in a water bath to 60-80°C under magnetic stirring, continue the reaction for 6-24 hours, and then use ...

specific Embodiment approach 2

[0033] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is 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

[0034] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step three, 10-100 mg of initiator azobisisobutyronitrile, 1-4 g of sodium p-styrenesulfonate 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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
concentrationaaaaaaaaaa
pore sizeaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
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