PTC (Positive Temperature Coefficient) exothermic material and preparation method thereof as well as PTC exothermic sheet

A heating material and heating sheet technology, applied in heating element materials, electric heating devices, ohmic resistance heating, etc., can solve the problems of partial thickness flexibility, insufficient and other problems, achieve good flexibility, thin thickness, improve the safety and stability of use sexual effect

Inactive Publication Date: 2012-06-27
ZHEJIANG HUAYUAN ELECTRIC HEAT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing PTC materials such as ceramics as the main crystal phase and composite organic materials have the disadvantages of being too thick or not flexible enough to be used for clothing or some household heating products.

Method used

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  • PTC (Positive Temperature Coefficient) exothermic material and preparation method thereof as well as PTC exothermic sheet
  • PTC (Positive Temperature Coefficient) exothermic material and preparation method thereof as well as PTC exothermic sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: A PTC heating material, its components include N, N-dimethylformamide, polyvinylidene fluoride and carbon powder, the N, N-dimethylformamide is a solvent, every 100ml N, N-di 8.0g-11.2g of polyvinylidene fluoride and 1.1-3.2g of carbon powder are miscible in the methyl formamide solution.

[0017] In order to increase the viscosity of the N, N-dimethylformamide solution, the component also includes a surface modifier montmorillonite, and 0.1 g of montmorillonite is added to every 100 ml of N, N-dimethylformamide solution.

[0018] Wherein, the carbon powder particles include carbon powder and carbon particles, and 0.5-2.0 g of carbon powder and 0.6-1.2 g of carbon particles are respectively added to every 100 ml of N,N-dimethylformamide solution.

[0019] A PTC heating sheet, such as figure 1 As shown, it includes a base material 1 and a wire 2 pressed on the base material 1 .

[0020] In order to improve the safety of use, the PTC heating sheet also incl...

Embodiment 2

[0048] Example 2: A PTC heating material, its components include N, N-dimethylformamide, polyvinylidene fluoride and carbon powder, the N, N-dimethylformamide is a solvent, every 100ml N, N-di Mix 8.0g-11.2g of polyvinylidene fluoride and 15-25g of aluminum powder in the methylformamide solution.

[0049] Specifically:

[0050] N,N-Dimethylformamide 70ml

[0051] Polyvinylidene fluoride 12.8g

[0052] Aluminum powder 20g

[0053] Montmorillonite 0.1g

[0054] Take 70ml of N,N-dimethylformamide, add 8.0g of polyvinylidene fluoride powder and mix, stir for 30min to make it evenly mixed, add 20g of aluminum powder and stir for 30min, put it in an oven, and heat at 80°C for 5min A blank is formed, molded with a mold, and then baked at 120° C. for 30 minutes to form a base material.

[0055] The structure of the PTC heating sheet is the same as in Example 1. For a specific example of a PTC heating sheet, take a 7*25cm base material, use thre...

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Abstract

The invention relates to a PTC (Positive Temperature Coefficient) exothermic material and a preparation method thereof as well as a PTC exothermic sheet. The PTC exothermic material is characterized by comprising the raw material components of N,N-dimethylformamide, polyvinylidene fluoride and carbon powder. The N,N-dimethylformamide is a solvent. 8.0-11.2 g of the polyvinylidene fluoride and 1.1-3.2 g of the carbon powder are mixed and dissolved in per 100 ml of an N,N-dimethylformamide solution; or 8.0-11.2 g of the polyvinylidene fluoride and 15-25 g of aluminum powder are mixed and dissolved in per 100 ml of the N,N-dimethylformamide solution. The PTC exothermic sheet comprises a substrate shaped by the PTC exothermic material and a lead wire pressed on the substrate. By changing the PTC raw material, the ultra-thin PTC exothermic sheet can be manufactured and the thickness can reach about 0.2 mm. The application range is enlarged and the PTC exothermic sheet can be applicable to clothes, exothermic products and the like in need of the ultra-thin PTC exothermic sheet.

Description

technical field [0001] The present invention relates to a PTC heating material, a preparation method thereof, and a PTC heating sheet, in particular to a PTC heating material for preparing an ultra-thin PTC heating sheet, a preparation method for preparing the PTC heating material, and the prepared PTC heating sheet piece. Background technique [0002] PTC (positivetem perature coefficient) is a positive temperature coefficient thermosensitive material, which has the characteristic that the resistance increases with the increase of temperature. In 1955, Heyman et al. of Philips Company in the Netherlands discovered that after adding a trace amount of rare earth elements to BaTiO ceramics, its room temperature resistivity dropped significantly, and its resistivity could increase by more than three orders of magnitude in a narrow temperature range. , first discovered the characteristics of PTC materials. Over the past 40 years, major breakthroughs have been made in the resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08K3/04C08K3/08C08K9/00C08K3/34H05B3/10H05B3/34
Inventor 袁建波
Owner ZHEJIANG HUAYUAN ELECTRIC HEAT
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