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PTC material and preparation method thereof, and material-containing thermistor and preparation method thereof

A positive temperature coefficient and content technology, applied to resistors with positive temperature coefficients, etc., can solve the problems of room temperature resistance stability, positive temperature coefficient thermistor strength, etc., and achieve good stability

Active Publication Date: 2013-03-27
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the defects of the resistance stability at room temperature and the poor strength of the positive temperature coefficient thermistor after repeated use of the positive temperature coefficient thermistor prepared by the positive temperature coefficient material prepared by the prior art

Method used

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Examples

Experimental program
Comparison scheme
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preparation example Construction

[0029] The present invention also provides a method for preparing a positive temperature coefficient material, the method comprising:

[0030] 1) Carry out 1-5Mrad dose electron beam radiation cross-linking modification to high-density polyethylene to obtain radiation-modified high-density polyethylene;

[0031] 2) mixing the radiation-modified high-density polyethylene prepared in step 1 with the inorganic insulating filler, extruding, and granulating to obtain a compound of radiation-modified high-density polyethylene / inorganic insulating filler;

[0032] 3) The compound of radiation modified high density polyethylene / inorganic insulating filler is mixed uniformly with polyethylene and titanate modified conductive filler and extruded to obtain polyethylene and titanate modified conductive filler and modified A mixture of permanent high-density polyethylene / inorganic insulating filler compound;

[0033] 4) Heating the mixture obtained in step 3 to 20-50° C. higher than the m...

Embodiment 1

[0070] This embodiment is used to illustrate the preparation of the positive temperature coefficient material and thermistor of the present invention.

[0071] HDPE (5000S Sinopec) was weighed, and was irradiated to obtain irradiation-modified high-density polyethylene (e-HDPE) under the irradiation dose of 3 Mrad electron beam.

[0072] According to the weight ratio of 20:10:65:4:1, HDPE (5000S Sinopec), radiation modified e-HDPE, titanate modified Ni powder (average particle size 2.5 μm), Mg(OH) 3 (Shandong Weifang Houde Chemical Industry), Antioxidant 1076 (Ciba Specialty Chemicals).

[0073] Firstly, the radiation-modified high-density polyethylene (e-HDPE) and the inorganic insulating filler Mg(OH) 3 After mixing in an internal mixer (S(X)M-0.5L-KA type, Suyan Technology) at 180°C for 30 minutes, it was granulated to obtain radiation-modified e-HDPE / Mg(OH) 3 Mixture, the average particle size is 2mm. Then HDPE and titanate-modified conductive filler Ni powder and the a...

Embodiment 2

[0079] This embodiment is used to illustrate the preparation of the positive temperature coefficient material and thermistor of the present invention.

[0080] HDPE (5000S Sinopec) was weighed, and irradiated at a dose of 5 Mrad electron beams to obtain irradiation-modified high-density polyethylene (e-HDPE).

[0081] According to the ratio of 15:15:65:3:2, LLDPE (DNDA7144 Sinopec), irradiation modified e-HDPE, titanate modified conductive filler Ni powder (average particle size 2.5 μm), MgO (Shandong Weifang Houde Chemical), Antioxidant 1010 (Ciba Specialty Chemical).

[0082] Firstly, the radiation-modified high-density polyethylene (e-HDPE) and MgO were mixed in an internal mixer (S(X)M-0.5L-KA type, Suyan Technology) at 180°C for 30 min, and then granulated to obtain radiation-modified high-density polyethylene (e-HDPE). According to the modified e-HDPE / MgO mixture, the average particle size is 2mm. Then LLDPE, titanate-modified Ni powder and the above-mentioned radiatio...

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PUM

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Abstract

The invention provides a positive temperature coefficient (PTC) material and a preparation method thereof, and a material-containing thermistor and a preparation method thereof. The PTC material is a product formed by melting a mixture, and is characterized in that: the mixture comprises polyethylene resin, irradiation modified polyethylene, titanate modified conductive filler and inorganic insulating filler. The PTC thermistor made of the PTC material has the characteristics of high room temperature resistance stability and high PTC strength after being used for multiple times.

Description

technical field [0001] The invention relates to a positive temperature coefficient material and a preparation method thereof, a thermistor containing the material and a preparation method thereof. Background technique [0002] Some polymer conductive composite materials have a positive temperature coefficient (PTC) effect, that is, the resistivity of the material increases with the increase of temperature, and the resistivity shows a sudden change of magnitude near the critical temperature. The application of polymer positive temperature coefficient materials has received more and more attention, but the stability of the materials needs to be further improved. The main problems that limit the application of positive temperature coefficient materials are: (1) the room temperature resistivity of positive temperature coefficient materials is unstable, and the resistivity of thermistors made of this material changes with the thermal cycle experienced during use; ( 2) The streng...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08K9/04H01C7/02
Inventor 李晓芳任茂林陈炎刘倩倩林信平
Owner BYD CO LTD