CN1251257C - High temperature resistant polypropylene capactive film and production thereof - Google Patents
High temperature resistant polypropylene capactive film and production thereof Download PDFInfo
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- CN1251257C CN1251257C CN 02138101 CN02138101A CN1251257C CN 1251257 C CN1251257 C CN 1251257C CN 02138101 CN02138101 CN 02138101 CN 02138101 A CN02138101 A CN 02138101A CN 1251257 C CN1251257 C CN 1251257C
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- high temperature
- temperature resistant
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- resistant polypropylene
- stretching
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Abstract
The present invention discloses a polypropylene capacitance film with high temperature resistance. When the polypropylene capacitance film is made to stand for 10 minutes at 120 DEG C, the transverse thermal-shrinkage rate of the polypropylene capacitance film is less than or equal to 0.2%, the transverse tensile strength of the polypropylene capacitance film is more than or equal to 210MPa, the longitudinal tensile strength of the polypropylene capacitance film is more than or equal to 160MPa, and the wetting tension of the polypropylene capacitance film is more than or equal to 37 mN/m. A production method comprises the steps of extruding plasticization, filtration, mould head shaping, cooling forming, longitudinal preheating and drawing shaping, transverse preheating and drawing shaping, etc. The production method of the present invention is unique to ensure that the product has the advantages of perfect inner microstructure and high temperature resistance and large tensile strength, and the working temperature of a capacitor made of the present invention can reach 105 DEG C.
Description
Technical field:
The present invention relates to a kind of capactive film and production technology.
Background technology:
Existing polypropylene capactive film, owing to reasons such as its internal microstructure, because laterally percent thermal shrinkage is bigger than normal relatively, in metallized capacitor making and use, cause the two ends metal level to be connected the bad dielectric loss angle tangent that causes with the film surface coat of metal and increase, the capacitor temperature raises, and capacitor is easily punctured, and, cause condenser capacity to descend because cross-direction shrinkage is serious; The withstand voltage properties of existing product is on the low side relatively simultaneously, and hot strength is less than normal, and heat resistance is poor.
Summary of the invention:
The object of the present invention is to provide a kind of Heat stability is good, high temperature resistant polypropylene capactive film high temperature resistant, that hot strength is big and production method.
Technical solution of the present invention is:
A kind of high temperature resistant polypropylene capactive film, its feature: horizontal percent thermal shrinkage≤0.2% when leaving standstill 15 minutes under 120 ℃, transverse tensile strength 〉=210MPa, longitudinal tensile strength 〉=160MPa, wetting tension 〉=37mN/m.
A kind of production method of high temperature resistant polypropylene capactive film, its feature: comprise the following steps: successively
1. extrusion plasticizing: pp material by the extruder heat fused, and is extruded and formed the uniform viscous state melt of fusion;
2. filter: the mechanical impurities in the elimination viscous state melt reaches not fusant;
3. die head typing: the melt that will handle after filtration forms the sheet melt by die head;
4. cooling forming: the sheet melt through the sharp cooling roll cooling and shaping, is formed the sheet that contains required crystallization;
5. vertically preheating, stretching, typing: adopt longitudinal stretching machine, with sheet preheating, stretching, typing with 6～10 preheat rolls;
6. laterally preheating, stretching, typing: the thick film behind longitudinal stretching is passed through the preheating of cross directional stretch machine, stretching, typing, form biaxially oriented film.
In the above-mentioned steps, filter and adopt 15～40 μ candle formula screen pack that melt is filtered.Die head temperature is 230～260 ℃, and the sharp cooling roll temperature is 50～100 ℃.The preheat temperature of longitudinal stretching machine is 100～145 ℃.The specification of the cross directional stretch machine that adopts is: heat set zone has 2～7 districts, and 6～21 meters, the temperature of heat set zone is 100～200 ℃.Pp material adopts electrician's grade polypropylene.The biaxially oriented film that forms is also through corona treatment.
Production method uniqueness of the present invention has guaranteed that product has perfect internal microstructure, and product is high temperature resistant, hot strength is big, and the working temperature of the capacitor made from the present invention can reach 105 ℃.
Embodiment:
The invention will be further described below in conjunction with embodiment:
1. extrusion plasticizing: power taking worker grade polypropylene raw material, by conventional vacuum intake system, in metal detector is drawn onto extruder top hopper, then with above-mentioned pp material by the extruder heat fused, and extrude and form the uniform viscous state melt of fusion;
2. filter: adopt 15～40 μ (example 15,20,30,40 μ) candle formula screen pack that melt is filtered, the mechanical impurities in the elimination viscous state melt reaches not fusant;
3. die head typing: the melt that will handle after filtration is by die head, and die head temperature is 230～260 ℃ (can be 230,240,250,260 ℃), forms the sheet melt;
4. cooling forming: is the sharp cooling roll cooling and shaping of 50～100 ℃ (can be 50,70,85,100 ℃) with the sheet melt through temperature, forms the sheet that contains required crystallization;
5. vertically preheating, stretching, typing: adopt the longitudinal stretching machine with 6～10 preheat rolls (can be 6,8,10), with sheet preheating, stretching, typing, the preheat roll temperature of longitudinal stretching machine is 100～145 ℃;
6. laterally preheating, stretching, typing: the thick film behind longitudinal stretching is passed through the preheating of cross directional stretch machine, stretching, typing, form biaxially oriented film.The specification of the cross directional stretch machine that adopts is: heat set zone has 6～21 meters in 2～7 districts (can be: 6 meters in 2 districts, 15 meters in 5 districts, 21 meters in 7 districts), and the temperature of heat set zone is 100～200 ℃.
The biaxially oriented film that forms also through cut edge, cooling processing, and through corona treatment: produce electric arc by the electrode electrion and film is carried out electricity bombard.
The high temperature resistant polypropylene capactive film that obtains, horizontal percent thermal shrinkage≤0.2% when leaving standstill 15 minutes under 120 ℃, transverse tensile strength 〉=210MPa, longitudinal tensile strength 〉=160MPa, wetting tension 〉=37mN/m can reach 105 ℃ with its working temperature that is processed into capacitor.
Claims (7)
1, a kind of high temperature resistant polypropylene capactive film is characterized in that: horizontal percent thermal shrinkage≤0.2% when leaving standstill 10 minutes under 120 ℃, transverse tensile strength 〉=210MPa, longitudinal tensile strength 〉=160MPa, wetting tension 〉=37mN/m.
2, a kind of production method of high temperature resistant polypropylene capactive film is characterized in that: comprise the following steps: successively
1. extrusion plasticizing: pp material by the extruder heat fused, and is extruded and formed the uniform viscous state melt of fusion;
2. filter: the mechanical impurities in the elimination viscous state melt reaches not fusant;
3. die head typing: the melt that will handle after filtration forms the sheet melt by die head;
4. cooling forming: the sheet melt through the sharp cooling roll cooling and shaping, is formed the sheet that contains required crystallization;
5. vertically preheating, stretching, typing: adopt longitudinal stretching machine, with sheet preheating, stretching, typing with 6～10 preheat rolls;
6. laterally preheating, stretching, typing: the thick film behind longitudinal stretching is passed through the preheating of cross directional stretch machine, stretching, typing, form biaxially oriented film; The specification of the cross directional stretch machine that adopts is: shaping area has 2～7 districts, 6～21 meters; The heat setting temperature of cross directional stretch machine is 100～200 ℃.
3, the production method of high temperature resistant polypropylene capactive film according to claim 2 is characterized in that: filter and adopt 15～40 μ candle formula screen pack that melt is filtered.
4, according to the production method of claim 2 or 3 described high temperature resistant polypropylene capactive films, it is characterized in that: die head temperature is 230～260 ℃, and the sharp cooling roll temperature is 50～100 ℃.
5, according to the production method of claim 2 or 3 described high temperature resistant polypropylene capactive films, it is characterized in that: the preheat roll temperature of longitudinal stretching machine is 100～145 ℃.
6, according to the production method of claim 2 or 3 described high temperature resistant polypropylene capactive films, it is characterized in that: pp material adopts electrician's grade polypropylene.
7, according to the production method of claim 2 or 3 described high temperature resistant polypropylene capactive films, it is characterized in that: the biaxially oriented film of formation is also through corona treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02138101 CN1251257C (en) | 2002-08-08 | 2002-08-08 | High temperature resistant polypropylene capactive film and production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02138101 CN1251257C (en) | 2002-08-08 | 2002-08-08 | High temperature resistant polypropylene capactive film and production thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1440041A CN1440041A (en) | 2003-09-03 |
| CN1251257C true CN1251257C (en) | 2006-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 02138101 Expired - Fee Related CN1251257C (en) | 2002-08-08 | 2002-08-08 | High temperature resistant polypropylene capactive film and production thereof |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1298527C (en) * | 2004-12-31 | 2007-02-07 | 浙江南洋电子薄膜有限公司 | Thermostable biaxially oriented polypropylene film adapted for high power capacitor and its making method |
| CN102543432B (en) * | 2011-12-28 | 2013-09-04 | 宁波大东南万象科技有限公司 | Preparation method of double-side metallized polypropylene capacitor film |
| CN102501387B (en) * | 2011-12-28 | 2014-01-01 | 宁波大东南万象科技有限公司 | Preparation method of corona-treated polypropylene coarsened capacitor film |
| CN102509610B (en) * | 2011-12-28 | 2013-06-19 | 宁波大东南万象科技有限公司 | Preparation method for 2.5 mu m polypropylene capacitor thin film |
| CN102592824A (en) * | 2012-03-09 | 2012-07-18 | 南通百正电子新材料有限公司 | High-temperature-resistant polypropylene capacitive film and production method thereof |
| CN102543425A (en) * | 2012-03-09 | 2012-07-04 | 南通百正电子新材料有限公司 | Method for producing high temperature resistant polypropylene capacitance film |
| CN102751091B (en) * | 2012-07-06 | 2014-12-03 | 江苏中立方实业有限公司 | High-temperature resistant ultrathin polypropylene metalized capacitor film for capacitor |
| CN111516235B (en) * | 2020-04-24 | 2022-03-08 | 泉州嘉德利电子材料有限公司 | Production device and preparation process of mixed-raw-material high-temperature-resistant capacitor film for automobile |
| CN115458342A (en) * | 2022-09-30 | 2022-12-09 | 浙江海滨薄膜科技有限公司 | BOPP (biaxially-oriented Polypropylene) capacitor film and preparation process thereof |
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Free format text: FORMER OWNER: LIU XIAODONG SUN GUICHENG JI YABING Owner name: NANTONG BENDUO NEW ELECTRONIC MATERIALS CO., LTD. Free format text: FORMER OWNER: ZHENG LIPING Effective date: 20101222 |
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