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Positive temperature coefficient (PTC) self-temperature-control hand warmer and manufacturing method thereof

A technology of self-control temperature and hand warmer, which is applied in the direction of heating appliances for treatment, cooling appliances for treatment, contraceptives, etc. It can solve the problems of high cost, complex structure, high molding temperature, etc., and achieve high PTC strength , simple structure and easy production

Inactive Publication Date: 2012-02-08
谢志军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Ordinary hand warmers use electric heating wires for heating, and temperature controllers for temperature adjustment and control, and only have the function of cooling after simple charging, so they cannot be used outdoors for a long time
Some hand warmers use multiple ceramic thermistors as the heating element, which has a complex structure and high cost, and the molding temperature of the ceramic PTC material is high. When heated at a high temperature for a long time, it is prone to negative resistance effect, which affects the long-term stability of the product.

Method used

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  • Positive temperature coefficient (PTC) self-temperature-control hand warmer and manufacturing method thereof
  • Positive temperature coefficient (PTC) self-temperature-control hand warmer and manufacturing method thereof
  • Positive temperature coefficient (PTC) self-temperature-control hand warmer and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] High-density polyethylene (HDPE): Density: 0.953g / cm 3 , melt index: 0.95g / 10min, melting point: 131°C, 20.04kg.

[0030] Inorganic filler: magnesium hydroxide: particle size: 2um-5um, 4.09kg.

[0031]Antioxidant: β-(3,5-di-tert-4-hydroxyphenyl) octadecyl propionate, 0.02kg. High-density polyethylene maleic anhydride graft copolymer: graft rate: 0.9%, 3.02kg.

[0032] Carbon nanotube (CNT): diameter: 10~20nm, length: 5~15um, specific surface area: 300~400m 2 / g, 0.45kg

[0033] Carbon black: Germany Dugussa LAMP101, 17.71kg.

[0034] Process:

[0035] 1) Dispersion of carbon nanotubes: carbon nanotubes (CNTs) were placed in 1 wt% PVP aqueous solution and stirred. Use Branson Digital Sonifier (Model 250) Sonicate Tip to carry out ultrasonic dispersion for 10min (30W), and then centrifuge it (3000rpm, 5min). Pour off the supernatant, filter the precipitate with a 0.2 μm PTFE membrane, dry it, and weigh it. About 70% of the CNTs are suspended in the aqueous phase. ...

Embodiment 2

[0044] Low-density polyethylene (LDPE): Melt index: 3.5g / 10min, 20.04kg.

[0045] Inorganic filler: magnesium hydroxide: particle size: 2um-5um, 4.09kg.

[0046] Antioxidant: β-(3,5-di-tert-4-hydroxyphenyl) octadecyl propionate, 0.02kg.

[0047] High-density polyethylene maleic anhydride graft copolymer: graft rate: 0.9%, 3.02kg.

[0048] Carbon nanotube (CNT): diameter: 10~20nm, length: 5~15um, specific surface area: 300~400m 2 / g, 0.45kg.

[0049] Carbon black: Germany Dugussa LAMP101, 17.71kg.

[0050] Process:

[0051] 1) Dispersion of carbon nanotubes: carbon nanotubes (CNTs) were placed in 1 wt% PVP aqueous solution and stirred. Use Branson Digital Sonifier (Model 250) Sonicate Tip to carry out ultrasonic dispersion for 10min (30W), and then centrifuge it (3000rpm, 5min). Pour off the supernatant, filter the precipitate with a 0.2 μm PTFE membrane, dry it, and weigh it. About 70% of the CNTs are suspended in the aqueous phase. Mix LDPE (powder) and CNT according ...

Embodiment 3

[0060] Ethylene / ethyl acrylate copolymer (EEA): Density: 0.938g / cm 3 , melting point: 84°C, 20.04kg.

[0061] Inorganic filler: magnesium hydroxide: particle size: 2um-5um, 4.09kg.

[0062] Antioxidant: β-(3,5-di-tert-4-hydroxyphenyl) octadecyl propionate, 0.02kg.

[0063] High-density polyethylene maleic anhydride graft copolymer: graft rate: 0.9%, 3.02kg.

[0064] Carbon nanotube (CNT): diameter: 10~20nm, length: 5~15um, specific surface area: 300~400m 2 / g, 0.45kg.

[0065] Carbon black: Germany Dugussa LAMP101, 17.71kg.

[0066] Process:

[0067] 1) Dispersion of carbon nanotubes: carbon nanotubes (CNTs) were placed in 1 wt% PVP aqueous solution and stirred. Use Branson Digital Sonifier (Model 250) Sonicate Tip to carry out ultrasonic dispersion for 10min (30W), and then centrifuge it (3000rpm, 5min). The supernatant was poured out, and the precipitate was filtered with a 0.2 μm PTFE membrane, dried, and weighed. About 70% of the CNTs were suspended in the water pha...

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Abstract

The invention discloses a hand warmer using composite conducting macromolecules as heating chips and a manufacturing method for the hand warmer. Compared with the prior art, the hand warmer has a simple structure and is easy and convenient to manufacture, wherein the composite conducting macromolecule heating chips have high PTC intensity, little current leakage and high safety; and the hand warmer has a self-temperature-control function, so a temperature-control circuit system is not required. The chip composite material adopts different polymers as matrixes to realize limited temperature self-control of different temperature, and adopts different polymer-based heating elements, which are connected in parallel, to realize different self-control temperature of the same hand warmer. The hand warmer can heat by plugging into a socket and through a self-contained battery, has continuous heating and intermittent heating functions, and can be used outdoors for a long time.

Description

Technical field: [0001] The invention relates to a PTC self-controlling hand warmer and its manufacturing method, which relate to the manufacture of a heating chip and its manufacturing method using composite conductive polymers as raw materials. technical background: [0002] The PTC material is a thermistor material with a positive temperature coefficient (Positive Temperature Coefficient), which has the characteristics of a huge mutation in the resistance value (the resistance value increases by at least 3 orders of magnitude) within a certain temperature range. [0003] PTC materials are divided into two categories, one is ceramic PTC materials, and the other is polymer-based PTC materials. Polymer-based PTC materials are widely used due to their low transition temperature, easy processing and low cost. [0004] Polymer positive temperature coefficient composite conductive polymer is made of crystalline polymer and conductive filler, melt blended. The conductive filler ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F7/00C08L23/06C08L23/08C08L9/02C08L63/00C08L27/16C08L51/06C08K13/04C08K3/04C08K7/00C08K3/08C08K7/06C08K3/22
Inventor 谢志军
Owner 谢志军
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