CN105131319A - Nanometer lithium iron phosphate-doped polypropylene-based composite dielectric film for film capacitor, and preparation method thereof - Google Patents
Nanometer lithium iron phosphate-doped polypropylene-based composite dielectric film for film capacitor, and preparation method thereof Download PDFInfo
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- CN105131319A CN105131319A CN201510479063.4A CN201510479063A CN105131319A CN 105131319 A CN105131319 A CN 105131319A CN 201510479063 A CN201510479063 A CN 201510479063A CN 105131319 A CN105131319 A CN 105131319A
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Abstract
The present invention relates to the field of dielectric film material preparation, particularly to a nanometer lithium iron phosphate-doped polypropylene-based composite dielectric film for a film capacitor, and a preparation method thereof. According to the composite film, a polypropylene film with a thickness of less than or equal to 5 [mu]m is adopted as a base film, a nanometer lithium iron phosphate-doped nanometer crystal cellulose/polyvinylidene chloride composite coating with a thickness of less than or equal to 5 [mu]m is coated on the base film surface, the composite coating liquid has good film forming property and good rheology property, and after the polypropylene film surface is dried, the obtained coating has excellent mechanical property, wherein the electrical property of the coating can be effectively improved through the nanometer lithium iron phosphate so as to make the coating have a high dielectric constant and low dielectric loss, the film layer is compact and flat, the temperature resistance is good, and the advantages of the organic/inorganic dielectric materials are completely combined. In addition, the production preparation process is simple, the processing performance is excellent, and the method is suitable for mass production, and can be used for production of small and large capacity film capacitors.
Description
Technical field
The present invention relates to dielectric film material preparation field, be specifically related to polypropylene-base compound dielectric film of a kind of membrane capacitance blending nano-grade lithium iron phosphate and preparation method thereof.
Background technology
Film capacitor, also known as plastic film capacitor, is that in all film capacitors, polypropylene capacitor is most widely used in actual use with the advantage of its uniqueness using plastics film as a dielectric class electrical condenser.Along with the development of industry, the requirement of electronic product to performances such as electrical condenser lightweight, heavy body is more and more higher, but the specific inductivity of polypropylene film is on the low side, is difficult to make high performance electrical condenser, governs the application of polypropylene capacitor.
Commonly at present mainly in polypropylene, fill the organic of high-k or mineral compound for the method improving polypropylene film specific inductivity, organic dielectric materials snappiness is good, the advantages such as easy machine-shaping, but there is the shortcoming such as non-refractory, less stable, and the defect of Inorganic Dielectric Material is that film processing properties is poor, and dielectric loss increases.Therefore, research and development one roughly the same time possess inorganic/organic dielectric materials advantage composite dielectric material be the development trend of industry, be also the potential research direction widening polypropylene film capacitor.
Summary of the invention
The object of the invention is to, provide polypropylene-base compound dielectric film of a kind of membrane capacitance blending nano-grade lithium iron phosphate and preparation method thereof, to achieve these goals, the technical solution used in the present invention is as follows:
A kind of polypropylene-base compound dielectric film of membrane capacitance blending nano-grade lithium iron phosphate, it is characterized in that, this dielectric film with thickness≤5 μm polypropylene film for basement membrane, and the compound coating in membrane surface coating thickness≤5 μm, described compound coating is made up of the raw material of following weight part: nano-grade lithium iron phosphate 3-4, alcohol ether solvent 10-15, polyether modified silicon oil 0.1-0.2, polyvinylpyrrolidone 1-2, N,N-dimethylacetamide 20-25, Macrogol 4000 .3-0.5, nanocrystal Mierocrystalline cellulose 2-3, polyvinylidene chloride 10-12.
Polypropylene-base compound dielectric film of described a kind of membrane capacitance blending nano-grade lithium iron phosphate and preparation method thereof, it is characterized in that, described preparation method is:
(1) preparation of composite coating liquid: first poly(oxyethylene glycol) 400 is dropped in alcohol ether solvent, heated and stirred makes it dissolve completely, drop in solution by nano-grade lithium iron phosphate subsequently, ultrasonic agitation dispersion makes nano-grade lithium iron phosphate be uniformly dispersed completely, and gained dispersion liquid is for subsequent use; Then polyvinylidene chloride, nanocrystal Mierocrystalline cellulose are dropped into N, in N-N,N-DIMETHYLACETAMIDE, heated and stirred makes solid substances dissolve completely, add the nano-grade lithium iron phosphate dispersion liquid of previously preparation again, after being uniformly mixed 20-30min, add other leftover materials, be uniformly mixed disposed slurry ball-milling processing 30-40min, and mixed slurry is carried out de-bubble process, obtain nanocrystal Mierocrystalline cellulose/polyvinylidene chloride composite coating liquid for subsequent use;
(2) composite coating liquid step (1) prepared utilizes and reverses the two sides of roller kiss-type coating method even spread to polypropylene film, and utilize warm air drying and method for far-infrared drying simultaneously, drying treatment under 80-120 DEG C of condition, must this polypropylene-base compound dielectric film after complete drying.
Compound dielectric film advantage prepared by the present invention is: the blending nanocrystal Mierocrystalline cellulose/polyvinylidene chloride composite coating liquid of nano-grade lithium iron phosphate, this composite coating liquid has good film-forming properties and rheological, gained coating good mechanical performance after polypropylene film surface drying, nano-grade lithium iron phosphate wherein effectively can improve the electric property of coating, coating is made to have higher specific inductivity and lower dielectric loss, rete densification is smooth, temperature tolerance is good, combine the advantage of organic/inorganic dielectric material fully, and manufacture process is simple, excellent processing performance, be applicable to scale operation, can be used for the membrane capacitance of production miniaturization and high capacity.
Embodiment
Embodiment
Polypropylene film thickness in the present embodiment is 5 μm, compound coating thickness is 5 μm, wherein compound coating is made up of following raw material: nano-grade lithium iron phosphate 3.5, alcohol ether solvent 13, polyether modified silicon oil 0.1, polyvinylpyrrolidone 1.5, N,N-dimethylacetamide 24, Macrogol 4000 .4, nanocrystal Mierocrystalline cellulose 2.5, polyvinylidene chloride 11.
The preparation method of the polypropylene-base compound dielectric film of described a kind of membrane capacitance blending nano-grade lithium iron phosphate is:
(1) preparation of composite coating liquid: first poly(oxyethylene glycol) 400 is dropped in alcohol ether solvent, heated and stirred makes it dissolve completely, drop in solution by nano-grade lithium iron phosphate subsequently, ultrasonic agitation dispersion makes nano-grade lithium iron phosphate be uniformly dispersed completely, and gained dispersion liquid is for subsequent use; Then polyvinylidene chloride, nanocrystal Mierocrystalline cellulose are dropped into N, in N-N,N-DIMETHYLACETAMIDE, heated and stirred makes solid substances dissolve completely, add the nano-grade lithium iron phosphate dispersion liquid of previously preparation again, after being uniformly mixed 25min, add other leftover materials, be uniformly mixed disposed slurry ball-milling processing 35min, and mixed slurry is carried out de-bubble process, obtain nanocrystal Mierocrystalline cellulose/polyvinylidene chloride composite coating liquid for subsequent use;
(2) composite coating liquid step (1) prepared utilizes and reverses the two sides of roller kiss-type coating method even spread to polypropylene film, and utilize warm air drying and method for far-infrared drying simultaneously, drying treatment under 100 DEG C of conditions, must this polypropylene-base compound dielectric film after complete drying.
The performance index of the laminated film obtained by the present embodiment are as follows:
Tensile strength is: 85.4MPa; Elongation at break: 55%; Volume specific resistance: 2.2 × 10
15Ω .cm; Under room temperature condition 1KHz frequency, specific inductivity is: 85, dielectric loss≤0.5% of condition elder generation, and laminated film is horizontal percent thermal shrinkage≤1% place 15min under 120 DEG C of conditions after, longitudinal percent thermal shrinkage≤2%.
Claims (2)
1. the membrane capacitance polypropylene-base compound dielectric film of blending nano-grade lithium iron phosphate, it is characterized in that, this dielectric film with thickness≤5 μm polypropylene film for basement membrane, and the compound coating in membrane surface coating thickness≤5 μm, described compound coating is formed by the preparation of raw material of following weight part: nano-grade lithium iron phosphate 3-4, alcohol ether solvent 10-15, polyether modified silicon oil 0.1-0.2, polyvinylpyrrolidone 1-2, N,N-dimethylacetamide 20-25, Macrogol 4000 .3-0.5, nanocrystal Mierocrystalline cellulose 2-3, polyvinylidene chloride 10-12.
2. the preparation method of the polypropylene-base compound dielectric film of a kind of membrane capacitance blending nano-grade lithium iron phosphate as claimed in claim 1, it is characterized in that, described preparation method is:
(1) preparation of composite coating liquid: first poly(oxyethylene glycol) 400 is dropped in alcohol ether solvent, heated and stirred makes it dissolve completely, drop in solution by nano-grade lithium iron phosphate subsequently, ultrasonic agitation dispersion makes nano-grade lithium iron phosphate be uniformly dispersed completely, and gained dispersion liquid is for subsequent use; Then polyvinylidene chloride, nanocrystal Mierocrystalline cellulose are dropped into N, in N-N,N-DIMETHYLACETAMIDE, heated and stirred makes solid substances dissolve completely, add the nano-grade lithium iron phosphate dispersion liquid of previously preparation again, after being uniformly mixed 20-30min, add other leftover materials, be uniformly mixed disposed slurry ball-milling processing 30-40min, and mixed slurry is carried out de-bubble process, obtain nanocrystal Mierocrystalline cellulose/polyvinylidene chloride composite coating liquid for subsequent use;
(2) composite coating liquid step (1) prepared utilizes and reverses the two sides of roller kiss-type coating method even spread to polypropylene film, and utilize warm air drying and method for far-infrared drying simultaneously, drying treatment under 80-120 DEG C of condition, must this polypropylene-base compound dielectric film after complete drying.
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| CN201510479063.4A CN105131319A (en) | 2015-08-03 | 2015-08-03 | Nanometer lithium iron phosphate-doped polypropylene-based composite dielectric film for film capacitor, and preparation method thereof |
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| CN201510479063.4A CN105131319A (en) | 2015-08-03 | 2015-08-03 | Nanometer lithium iron phosphate-doped polypropylene-based composite dielectric film for film capacitor, and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105469981A (en) * | 2015-12-31 | 2016-04-06 | 安徽源光电器有限公司 | Preparation method of composite polypropylene dielectric thin-film electrode for thin-film capacitor |
| CN108456324A (en) * | 2018-04-09 | 2018-08-28 | 南通洪明电工科技有限公司 | A kind of surface coating technology prepares the method and its application of high-performance inorganic/organic composite multilayer dielectric thin film |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104479161A (en) * | 2013-11-21 | 2015-04-01 | 东莞市长安东阳光铝业研发有限公司 | Polyvinylidene fluoride/polypropylene composite film for film capacitor and preparation method |
-
2015
- 2015-08-03 CN CN201510479063.4A patent/CN105131319A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104479161A (en) * | 2013-11-21 | 2015-04-01 | 东莞市长安东阳光铝业研发有限公司 | Polyvinylidene fluoride/polypropylene composite film for film capacitor and preparation method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105469981A (en) * | 2015-12-31 | 2016-04-06 | 安徽源光电器有限公司 | Preparation method of composite polypropylene dielectric thin-film electrode for thin-film capacitor |
| CN108456324A (en) * | 2018-04-09 | 2018-08-28 | 南通洪明电工科技有限公司 | A kind of surface coating technology prepares the method and its application of high-performance inorganic/organic composite multilayer dielectric thin film |
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Application publication date: 20151209 |