Polymer complex substance with resistance nonlinear positive temperature coefficient effect

A composite and polymer technology, applied in the field of polymer composites, can solve the problems of increasing the room temperature resistance of components, unable to effectively suppress the NTC effect of polymer composites, and low bonding strength.

Inactive Publication Date: 2005-02-16
沈守兵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the commonly used radiation crosslinking method is not very effective, such as the required radiation dose is large, and the NTC effect of the polymer composite cannot be effectively inhibited, etc.
[0005] In addition, when the overcurrent protection element is produced according to the conventional method, the composite effect of the polymer composite sheet and the metal foil is not good, and the bonding strength is not high, which increases the contact resistance, thereby increasing the room temperature resistance of the element and reducing PTC strength

Method used

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  • Polymer complex substance with resistance nonlinear positive temperature coefficient effect
  • Polymer complex substance with resistance nonlinear positive temperature coefficient effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 44 kg of high-density polyethylene with different MFR values, 39 kg of carbon black, 13 kg of magnesium oxide, 3 kg of crosslinking agent triallyl isocyanurate (TAIC), and 1 kg of antioxidant 1010 were mixed in a mixer Pre-mixed, then melted and kneaded by an internal mixer, out of the sheet, cooled, hot-pressed on both sides of the metal foil and cut into small pieces, welded electrodes, using Co 60 γ-rays were irradiated for cross-linking with a dose of 200kGy. An overcurrent protection element is produced. The resistance of the test sample changes with time at the melting point temperature of the polymer. Taking the resistance R after 2 hours 2 Instead of the maximum resistance R achieved during the test max The ratio of is used to characterize the size of the NTC phenomenon that is inhibited. The larger the ratio, the less obvious the NTC phenomenon and the better the effect of inhibiting the NTC effect.

[0015] Example one

[0016] It can be seen ...

Embodiment 2

[0018] 13 kg of different inorganic fillers, 44 kg of high-density polyethylene, 39 kg of carbon black, 3 kg of cross-linking aid triallyl isocyanurate (TAIC), 1 kg of antioxidant 1010, etc. in the mixer Pre-mixed in the internal mixer, then melted and kneaded by an internal mixer, out of the sheet, cooled, hot-pressed on both sides of the metal foil and cut into small pieces, welded electrodes, using Co 60 γ-rays were irradiated for cross-linking with a dose of 200kGy. An overcurrent protection element is produced. Test the resistivity of the sample at room temperature, and measure its PTC strength, the results are shown in Table 2. The surface of the polymer composite sheet was analyzed by electron spectroscopy, and the results are shown in Table 3.

[0019] Example one

[0020]

[0021] It can be seen from Table 2 and Table 3 that adding polar oxygen-containing inorganic fillers to the polymer composite increases the number of oxygen-containing gro...

Embodiment 3

[0023] 44 kg of polyethylene with different crystallinity values ​​(characterized by density), 39 kg of carbon black, 13 kg of magnesium oxide, 3 kg of crosslinking agent triallyl isocyanurate (TAIC), 1 kg of antioxidant 1010 Pre-mixed in a mixer, then melted and kneaded by an internal mixer, discharged, cooled, hot-pressed on both sides of the metal foil and cut into small pieces, welded electrodes, using Co 60 γ-rays were irradiated for cross-linking with a dose of 200kGy. An overcurrent protection element is produced. Test the resistivity of the sample at room temperature, and measure its PTC strength.

[0024] Example one

[0025] It can be seen from Table 4 that by optimizing the density value of polyethylene, the polymer composite can have both lower resistivity and higher PTC strength, and the comparative example is the existing conventional value.

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Abstract

This invention refers to a kind of polymer complex of non-linear positive temperature coefficient effect of resistance and the overflow protection organ of electrocircuit made from this polymer complex and is featured by the following components: polyethylene whose fusion index changes between 0.2g / 10min and 10.0g / 10min and whose density varies from 0.90g / cm3 to 0.99g / cm3, charcoal black, inorganic filler, crosslinking auxiliary agent and antioxidant. The inorganic filler is polar compound with oxygen, and the crosslinking agent is polyfunctional group compound with double bond. This invention makes use of the polymer complex to produce the overflow protection organ of electrocircuit and includes double-decked tinsel and electrode and its feature lies in there is sheet material of polymer complex between the two tinsels and that the tinsels connect with sheet material of polymer complex through hot pressing. The invention has positive temperature coefficient effect of resistance, restrains the NTC effect and has relatively low resistivity at room temperature and high PTC intensity.

Description

technical field [0001] The invention relates to a polymer compound, in particular to a polymer compound with a non-linear positive temperature coefficient effect of resistance, and a thermistor body using the polymer compound can be used to manufacture a circuit overcurrent protection element. Background technique [0002] The so-called polymer PTC (Positive Temperature Coefficient) thermistor with the effect of positive temperature coefficient of resistance has been widely used in the field of circuit protection in recent years because of its rapid response and good recovery, which can make devices with small resistance. The so-called PTC effect refers to the positive temperature coefficient (Positive Temperature Coefficient) effect, that is, the resistance of the material increases with the increase of temperature. General metal conductors have this property, polymer PTC composite thermosensitive material has this effect, and it is particularly useful that its resistance c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08K5/14C08L23/06
Inventor 沈守兵
Owner 沈守兵
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