CN103304937A - PTC (Positive Temperature Coefficient) macromolecular heating material based on polyvinylidene fluoride and preparation method thereof - Google Patents
PTC (Positive Temperature Coefficient) macromolecular heating material based on polyvinylidene fluoride and preparation method thereof Download PDFInfo
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- CN103304937A CN103304937A CN 201310197490 CN201310197490A CN103304937A CN 103304937 A CN103304937 A CN 103304937A CN 201310197490 CN201310197490 CN 201310197490 CN 201310197490 A CN201310197490 A CN 201310197490A CN 103304937 A CN103304937 A CN 103304937A
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Abstract
The invention discloses a PTC (Positive Temperature Coefficient) macromolecular heating material based on polyvinylidene fluoride. The PTC macromolecular heating material is prepared from the following raw materials in parts by weight: 80-85 parts of polyvinylidene fluoride, 10-15 parts of polyethylene grafted with maleic anhydride, 20-25 parts of aluminum powder, 5-8 parts of nickel powder, 12-14 parts of aluminum nitride, 20-25 parts of maifanite powder, 3-5 parts of calcium fluoride, 6-8 parts of magnesium hydrate, 10-12 parts of bauxite, 3-5 parts of phenyl triethoxysilane, 5-8 parts of dimethicone, 2-4 parts of epoxy linseed oil and 1-2 parts of ammonium dihydrogen phosphate. The PTC macromolecular heating material and the preparation method thereof have the advantages that the PTC strength and PTC stability of the material are improved greatly, the resistance is stable, the temperature is uniform, the PTC characteristic is stable, and the service life of the material is prolonged.
Description
Technical field
The invention belongs to polymeric material field, be specifically related to a kind of polyvinylidene fluoride PTC exothermic material and preparation method thereof.
Background technology
The PTC polymer heating material is as in overheated, the various fields such as overcurrent protection is widely used in communicating by letter with the temp auto-controlled heating material, computer, automobile, Industry Control, household electrical appliance.Mainly take graphite and carbon black as conductive filler material, mainly there is the room temperature resistance wider distribution in present organic PTC material, the problem such as PTC intensity is little, stability is lower.
Summary of the invention
The purpose of this invention is to provide a kind of polyvinylidene fluoride PTC polymer heating material and preparation method thereof, possess low room temperature resistivity, long-term through-flow stable performance, high PTC intensity and high PTC stability.
Technical solution of the present invention is as follows:
A kind of polyvinylidene fluoride PTC polymer heating material, it is characterized in that: the raw material by following weight part is made: the polyethylene 10-15 of polyvinylidene difluoride (PVDF) 80-85, maleic anhydride graft, aluminium powder 20-25, nickel powder 5-8, aluminium nitride 12-14, medical stone powder 20-25, Calcium Fluoride (Fluorspan) 3-5, magnesium hydroxide 6-8, bauxitic clay 10-12, phenyl triethoxysilane 3-5, dimethyl silicone oil 5-8, epoxy Toenol 1140 2-4, primary ammonium phosphate 1-2.
Described high-density polyethylene thiazolinyl PTC polymer heating material, it is characterized in that: may further comprise the steps: bauxitic clay is added the water stirring make suspension, be heated to 80-90 ℃, add again phenyl triethoxysilane, aluminium powder, after high speed dispersion 10-20 minute, be cooled to room temperature, add again medical stone powder, Calcium Fluoride (Fluorspan), dimethyl silicone oil, after stirring, ground 2-3 hour, to slurry, spraying drying obtains powder; Polyethylene, nickel powder, aluminium nitride, the phenyl triethoxysilane of maleic anhydride graft were descended mixing 10-20 minute at 80-120 ℃, obtain compound; Polyvinylidene difluoride (PVDF), gained powder are mixed with compound and other surplus stock, be heated to 140-180 ℃, mixed 18-25 minute, extruding pelletization obtains.
PTC polymer heating material of the present invention is pressed into sheet material, at sheet surface compacting wire, namely obtains the PTC fever tablet again.
The present invention adopts aluminium powder and nickel powder as conducing composite material, enters phenyl triethoxysilane, aluminium powder
AddMedical stone powder, Calcium Fluoride (Fluorspan), dimethyl silicone oil grind, and increase the molecular network lattice structure between it, have to strengthen heat-resisting, anti-stream, the withstand voltage and effect that improves resistance change stability; The polyethylene of maleic anhydride graft of the present invention, nickel powder, aluminium nitride, phenyl triethoxysilane are carried out a batch mixing, having increased each raw material forms dispersed, through behind the rerolling, increased the compatibility between each material composition, conductive network structure more firm, greatly improved PTC intensity of the present invention and high PTC stability, resistance stabilization, temperature is even, ptc characteristics is stable, the work-ing life of increase material.
Embodiment
A kind of polyvinylidene fluoride PTC polymer heating material is made by the raw material of following weight part (kilogram): the polyethylene 15 of polyvinylidene difluoride (PVDF) 80, maleic anhydride graft, aluminium powder 25, nickel powder 8, aluminium nitride 14, medical stone powder 25, Calcium Fluoride (Fluorspan) 5, magnesium hydroxide 6, bauxitic clay 12, phenyl triethoxysilane 3, dimethyl silicone oil 5, epoxy Toenol 1140 4, primary ammonium phosphate 2.
Described high-density polyethylene thiazolinyl PTC polymer heating material, may further comprise the steps: bauxitic clay is added the water stirring make suspension, be heated to 80-90 ℃, add again phenyl triethoxysilane, aluminium powder, after high speed dispersion 10-20 minute, be cooled to room temperature, add again medical stone powder, Calcium Fluoride (Fluorspan), dimethyl silicone oil, after stirring, ground 2-3 hour, to slurry, spraying drying obtains powder; Polyethylene, nickel powder, aluminium nitride, the phenyl triethoxysilane of maleic anhydride graft were descended mixing 10-20 minute at 80-120 ℃, obtain compound; Polyvinylidene difluoride (PVDF), gained powder are mixed with compound and other surplus stock, be heated to 140-180 ℃, mixed 18-25 minute, extruding pelletization obtains.
PTC polymer heating material of the present invention is pressed into sheet material, prepares the bar shaped sample of long 100mm, wide 6.5mm, thick 2mm, at sheet surface compacting wire, namely obtain the PTC fever tablet again.
Detect performance:
Room temperature (25 ℃) zero power resistance is 13m Ω, PTC intensity reaches more than 8.8, with its after thermal cycling between-20 ℃ and 140 ℃ 200 times its room temperature resistance still below 30m Ω, and the changing conditions of resistance is stable in thermal cycling, has long-term through-flow through-current capability greater than 100A.Generated heat 36 hours continuously at 200 times, without burning phenomenon.The PTC polymer heating material life-span: energising in 15 minutes was once cut off the power supply once circulation in 30 minutes, break-make 5000 times, power variation rate 93%, rate of temperature change 98% in 15 minutes.
Claims (2)
1. polyvinylidene fluoride PTC polymer heating material, it is characterized in that: the raw material by following weight part is made: the polyethylene 10-15 of polyvinylidene difluoride (PVDF) 80-85, maleic anhydride graft, aluminium powder 20-25, nickel powder 5-8, aluminium nitride 12-14, medical stone powder 20-25, Calcium Fluoride (Fluorspan) 3-5, magnesium hydroxide 6-8, bauxitic clay 10-12, phenyl triethoxysilane 3-5, dimethyl silicone oil 5-8, epoxy Toenol 1140 2-4, primary ammonium phosphate 1-2.
2. high-density polyethylene thiazolinyl PTC polymer heating material according to claim 1, it is characterized in that: may further comprise the steps: bauxitic clay is added the water stirring make suspension, be heated to 80-90 ℃, add again phenyl triethoxysilane, aluminium powder, after high speed dispersion 10-20 minute, be cooled to room temperature, add again medical stone powder, Calcium Fluoride (Fluorspan), dimethyl silicone oil, after stirring, ground 2-3 hour, to slurry, spraying drying obtains powder; Polyethylene, nickel powder, aluminium nitride, the phenyl triethoxysilane of maleic anhydride graft were descended mixing 10-20 minute at 80-120 ℃, obtain compound; Polyvinylidene difluoride (PVDF), gained powder are mixed with compound and other surplus stock, be heated to 140-180 ℃, mixed 18-25 minute, extruding pelletization obtains.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310197490 CN103304937A (en) | 2013-05-24 | 2013-05-24 | PTC (Positive Temperature Coefficient) macromolecular heating material based on polyvinylidene fluoride and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201310197490 CN103304937A (en) | 2013-05-24 | 2013-05-24 | PTC (Positive Temperature Coefficient) macromolecular heating material based on polyvinylidene fluoride and preparation method thereof |
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| CN103304937A true CN103304937A (en) | 2013-09-18 |
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| CN 201310197490 Pending CN103304937A (en) | 2013-05-24 | 2013-05-24 | PTC (Positive Temperature Coefficient) macromolecular heating material based on polyvinylidene fluoride and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104130502A (en) * | 2014-07-28 | 2014-11-05 | 淮南文峰航天电缆有限公司 | Aviation cable sheath material dedicated heat-resistant filler and preparation method thereof |
-
2013
- 2013-05-24 CN CN 201310197490 patent/CN103304937A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104130502A (en) * | 2014-07-28 | 2014-11-05 | 淮南文峰航天电缆有限公司 | Aviation cable sheath material dedicated heat-resistant filler and preparation method thereof |
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Application publication date: 20130918 |
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| WD01 | Invention patent application deemed withdrawn after publication |