CN102806674A - Method for producing polytetrafluoroethylene regenerated turning films - Google Patents
Method for producing polytetrafluoroethylene regenerated turning films Download PDFInfo
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- CN102806674A CN102806674A CN2012102784300A CN201210278430A CN102806674A CN 102806674 A CN102806674 A CN 102806674A CN 2012102784300 A CN2012102784300 A CN 2012102784300A CN 201210278430 A CN201210278430 A CN 201210278430A CN 102806674 A CN102806674 A CN 102806674A
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Abstract
The invention relates to the field of recycling of polytetrafluoroethylene waste, in particular to a method for producing polytetrafluoroethylene regenerated turning films. The method comprises the following steps of: 1) uniformly adding the prepared powder into a die cavity, adding the polytetrafluoroethylene regenerated powder according to the required size, and then pressurizing by an automatic control a two-head pressing machine; 2) placing the semi-finished products into a thermostat to carry out constant temperature treatment after taking out the semi-finished products; 3) placing the semi-finished products subjected to constant temperature into an automatic control constant temperature sintering furnace to sinter; and 4) opening the sintering furnace, taking out the semi-finished products for later use after completely cooling the semi-finished products, and turning into the turning films in a lathe. The regenerated turning films obtained by the invention are excellent in dielectric property and free of aging, the performances substantially reach the requirements of the turning films of native powder, and the surfaces are smooth and free of impurities; and the regenerated turning films pass through the performance detection in Shanghai Plastics Institute, and the various indexes are substantially close to the performances of the turning films of the native powder.
Description
Technical field
The present invention relates to the regeneration field of polyfluortetraethylewastes wastes, relate in particular to a kind of production method of polytetrafluoroethylregenerated regenerated turning film.
Background technology
Polytetrafluoroethylplastic plastic is a kind of engineering plastics of excellent performance, and it is good that it has self-lubricating property, and coefficient of friction is low, high-low temperature resistant; Corrosion-resistant and good insulation performance performance and non-viscosity are widely used in machinery, electronics; Oil, chemical industry, industries such as food, light industry.Because polytetrafluoroethylplastic plastic can not natural degradation property, discarded polytetrafluoroethylplastic plastic will cause bigger pollution to environment.Therefore, how polyfluortetraethylewastes wastes is recycled, turning waste into wealth becomes the direction of a research.
Existing polyfluortetraethylewastes wastes regeneration techniques such as Chinese invention patent (notification number is 1048267) disclose a kind of regenerated polytetrafluoroethylproducts products and production method thereof.It is with polyfluortetraethylewastes wastes and inserts by the weight ratio mixing of 100:0 ~ 60 after pressurization, heating form, this inventive method is simple, product cost is low, possesses machinery, chemical property that former polytetrafluoroethylproducts products is arranged.
(application number: 200710067131.1 applyings date: 2007-01-31) disclose a kind of polyfluortetraethylewastes wastes regenerative powder and preparation method thereof and by the bar of its preparation, this method comprises the steps: that (1) clean removal of impurities to Chinese invention patent; (2) pulverizing, abrasive dust, sieve; (3) sintering; (4) slitting; (5) granulation; (6) packing, warehouse-in.The present invention is through above-mentioned technology, and the polytetrafluoroethylregenerative regenerative powder of being produced has reached the performance of former fecula basically, can be fit to kinds of processes and prepare polytetrafluoroethylproducts products.
Polyfluortetraethylene plate (also being the tetrafluoro plate, Teflon plate, Teflon plate) divides two kinds of mold pressing and turning, and moulded board is to use the die pressing moulding at normal temperatures by polyflon, processes through sintering, cooling again.Polytetrafluoroethylene (PTFE) turning plate is formed through pressed compact, sintering, rotary-cut by polyflon.Its product-use is wide, has very superior combination property: high-low temperature resistant (192 ℃-260 ℃), corrosion-resistant (strong acid, highly basic, chloroazotic acid etc.), weather, high insulation, highly lubricate, do not adhere to, good characteristic such as nonhazardous.But existing polytetrafluoroethylene (PTFE) turning plate, film, band all are to adopt the polytetrafluoroethylene (PTFE) honest material to process, and then also can't in polytetrafluoroethylene (PTFE) turning plate, film, band, be applied for polytetrafluoroethylregenerated regenerated material.
Summary of the invention
In order to solve the technical problem that polytetrafluoroethylregenerated regenerated material is used in polytetrafluoroethylene (PTFE) turning plate, film, band; The production method that the purpose of this invention is to provide a kind of polytetrafluoroethylregenerated regenerated turning film; This method can adopt polytetrafluoroethylregenerative regenerative powder to prepare polytetrafluoroethylregenerated regenerated turning film; The film of being produced has superior dielectric properties, and is not aging, the best resistance to chemical corrosion and the wide scope of application.
In order to realize above-mentioned purpose, the technical scheme below the present invention has adopted:
The production method of polytetrafluoroethylregenerated regenerated turning film, this method comprises the steps:
1) powder for preparing is evenly added in the die cavity, press required size, add polytetrafluoroethylregenerative regenerative powder; Adopt automatic control two press, both direction constant force is simultaneously exerted pressure whenever at a distance from 20 ~ 40 seconds pressures once, and the air that is beneficial to powder is discharged; Compacting on time; Exert pressure through 5 ~ 8 hours constant force, during whenever flat centimetre of 30 ~ 40mp of pressure, stop; Do not unclamp, continue the constant force pressurize, take out after 1.5 ~ 3 hours;
2) take out blank after, put into 25-30 ℃ insulating box constant temperature 20 ~ 30 hours, so that release pressure and stress;
3), put in the sintering furnace with self-control thermostatic function beginning constant temperature sintering into the blank behind the constant temperature:
Phase I, be warming up to 150 ℃, constant temperature 2.5 ~ 3.5 hours in 5 ~ 7 hours;
Second stage raises 150 ℃-200 ℃, constant temperature 2.5 ~ 3.5 hours;
Phase III, be warmed up to 300 ℃, constant temperature 15 ~ 20 hours in 5 ~ 7 hours;
Stage is warmed up to 320 ℃ in 1.5 ~ 2.5 hours, constant temperature 12 ~ 18 hours;
Five-stage is warmed up to 340 ℃ in 1.5 ~ 2.5 hours, constant temperature 5 ~ 10 hours;
In the 6th stage, be warming up to 380 ℃ in 3 ~ 5 hours, constant temperature 20 ~ 30 hours;
Move back thermophase, 2 ~ 4 hours 380 ℃-340 ℃, constant temperature 2 ~ 4; 1.5 ~ 2.5 hours 340 ℃-320 ℃, constant temperature 6 ~ 10 hours; 1.5 ~ 2.5 hours 320 ℃-300 ℃, constant temperature 6 ~ 10 hours; 8 ~ 12 hours 300 ℃-200 ℃, constant temperature 2 ~ 4 hours;
During 4) to 200 ℃, open sintering furnace, cool off fully to blank, take out subsequent usely, with complete cooled blank, be heated to 100 ℃-150 ℃ again, get into lathe, car becomes regeneration turning film.
As preferably, the thickness of above-mentioned regeneration turning film is 0.1mm-0.5mm.
As preferably, the preparation method of above-mentioned polytetrafluoroethylregenerative regenerative powder is following:
1. polyfluortetraethylewastes wastes is sorted, cleans, removal of impurities;
2. abrasive dust;
3. sintering, sintering temperature is 350 ~ 380 ℃, sintering time is 18 hours, makes the powder caking;
4. with above-mentioned caking powder slitting;
5. dry type fine gtinding machine grinds, and wears into the powdery that particle diameter is the 450-600 micron;
6. sieve with the steel sieve;
7. packing is put in storage.
The present invention is owing to adopted above-mentioned technical scheme; The regeneration turning film for preparing, its performance reach the turning film requirement of former fecula basically, have superior dielectric properties; Not aging; The smooth surface free from admixture has passed through the Performance Detection of Shanghai plastic institute, and each item index is all basic approaching with former fecula turning film performance.
The specific embodiment
Do a detailed explanation below in conjunction with specific embodiments of the invention, but do not limited by embodiment.
Embodiment 1
A kind of preparation method of polytetrafluoroethylregenerative regenerative powder comprises the steps:
1. removal of impurities is handled, and with the polyfluortetraethylewastes wastes blank, cleans, and dries, and divides and chooses impurity;
2. the powder abrasive dust is cut into strip with above-mentioned block polyfluortetraethylewastes wastes, threadly also can be ground into particle, becomes powder with the Carborundum wheel fine gtinding;
3. sintering.With the evenly oven dry in baking oven of the above-mentioned polytetrafluoroethylene (PTFE) powder that obtains, oven temperature is arranged on 100 ~ 200 ℃ of oven dry, sintering then, temperature 350-380 ℃ of constant temperature 18 hours;
4. slitting is cut into strip with the powder behind the sintering with cutting cutter, cheap dry type fine gtinding;
5. grind once more, with the block powder of strip, it is 450 ~ 600 microns powdery that use dry type fine gtinding machine grinds to form size;
6. sieve, sieve with the steel sieve again, obtain the powder of 450 ~ 600 order single-sizes;
7. with the above-mentioned powder packaging that obtains, put in storage.
Embodiment 2
Obtained polytetrafluoroethylregenerative regenerative powder of the present invention through the above embodiments 1 technology, following with the technology of its preparation turning sheet material:
1. cleaning is installed grinding tool;
2. the powder for preparing is evenly added in the die cavity, press required size, an amount of powder amount of using that adds;
3. adopt automatic control two press, both direction constant force is simultaneously exerted pressure whenever at a distance from 30 seconds pressures once, and the air that is beneficial to powder is discharged compacting on time;
4. exert pressure through 6 hours constant force, during whenever flat centimetre of 35 mp of pressure, stop;
5. do not unclamp, continue the constant force pressurize, get after two hours;
6. behind the taking-up blank, put into 25-30 ℃ insulating box constant temperature 24 hours, so that release pressure and stress;
7. with the blank behind the constant temperature, put in the sintering furnace with self-control thermostatic function beginning constant temperature sintering, total 6 days consuming time into; Phase I, 0-150 heated up 6 hours, constant temperature 3 hours,
Second stage raises 150 ℃-200 ℃, constant temperature 3 hours,
Phase III, be warmed up to 300 ℃ about 6 hours, constant temperature 18 hours,
Stage is warmed up to 320 ℃, and two hours, constant temperature 15 hours,
Five-stage, be warmed up to 340 ℃ two hours, constant temperature 8 hours,
The 6th stage, be warming up to 380 ℃ four hours, constant temperature 24 hours,
Move back temperature, 380 ℃-340 ℃ about three hours, constant temperature three hours, 340 ℃-320 ℃ about two hours, constant temperature 8 hours, 320 ℃-300 ℃ about two hours, constant temperature 8 hours, 300 ℃-200 ℃ about 10 hours;
Constant temperature is opened sintering furnace in the time of three hours to 200 ℃, cools off fully to blank, takes out subsequent usely, with complete cooled blank, is heated to 100 ℃-150 ℃ again, gets into lathe, and car becomes the turning film, and the thickness of turning film is 0.1mm-0.5mm.
Claims (3)
1. the production method of polytetrafluoroethylregenerated regenerated turning film is characterized in that this method comprises the steps:
1) powder for preparing is evenly added in the die cavity, press required size, add polytetrafluoroethylregenerative regenerative powder; Adopt automatic control two press, both direction constant force is simultaneously exerted pressure whenever at a distance from 20 ~ 40 seconds pressures once, and the air that is beneficial to powder is discharged; Compacting on time; Exert pressure through 5 ~ 8 hours constant force, during whenever flat centimetre of 30 ~ 40mp of pressure, stop; Do not unclamp, continue the constant force pressurize, take out after 1.5 ~ 3 hours;
2) take out blank after, put into 25-30 ℃ insulating box constant temperature 20 ~ 30 hours, so that release pressure and stress;
3), put in the sintering furnace with self-control thermostatic function beginning constant temperature sintering into the blank behind the constant temperature:
Phase I, be warming up to 150 ℃, constant temperature 2.5 ~ 3.5 hours in 5 ~ 7 hours;
Second stage raises 150 ℃-200 ℃, constant temperature 2.5 ~ 3.5 hours;
Phase III, be warmed up to 300 ℃, constant temperature 15 ~ 20 hours in 5 ~ 7 hours;
Stage is warmed up to 320 ℃ in 1.5 ~ 2.5 hours, constant temperature 12 ~ 18 hours;
Five-stage is warmed up to 340 ℃ in 1.5 ~ 2.5 hours, constant temperature 5 ~ 10 hours;
In the 6th stage, be warming up to 380 ℃ in 3 ~ 5 hours, constant temperature 20 ~ 30 hours;
Move back thermophase, 2 ~ 4 hours 380 ℃-340 ℃, constant temperature 2 ~ 4; 1.5 ~ 2.5 hours 340 ℃-320 ℃, constant temperature 6 ~ 10 hours; 1.5 ~ 2.5 hours 320 ℃-300 ℃, constant temperature 6 ~ 10 hours; 8 ~ 12 hours 300 ℃-200 ℃, constant temperature 2 ~ 4 hours;
During 4) to 200 ℃, open sintering furnace, cool off fully to blank, take out subsequent usely, with complete cooled blank, be heated to 100 ℃-150 ℃ again, get into lathe, car becomes film.
2. the production method of polytetrafluoroethylregenerated regenerated turning film according to claim 1, the thickness that it is characterized in that the turning film is 0.1mm-0.5mm.
3. the production method of polytetrafluoroethylregenerated regenerated turning film according to claim 1 is characterized in that the preparation method of polytetrafluoroethylregenerative regenerative powder is following:
1. polyfluortetraethylewastes wastes is sorted, cleans, removal of impurities;
2. abrasive dust;
3. sintering, sintering temperature is 350 ~ 380 ℃, sintering time is 18 hours, makes the powder caking;
4. with above-mentioned caking powder slitting;
5. dry type fine gtinding machine grinds, and wears into the powdery that particle diameter is the 450-600 micron;
6. sieve with the steel sieve;
7. packing is put in storage.
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| CN2012102784300A CN102806674A (en) | 2012-08-07 | 2012-08-07 | Method for producing polytetrafluoroethylene regenerated turning films |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104527100A (en) * | 2014-11-12 | 2015-04-22 | 浙江德清科赛塑料制品有限公司 | A manufacturing process of an ultrathin wide film from reclaimed filled polytetrafluoroethylene |
| CN105171956A (en) * | 2015-09-10 | 2015-12-23 | 湖州格尔泰斯环保技术有限公司 | Production method of polytef regeneration straps |
| CN105690786A (en) * | 2016-02-01 | 2016-06-22 | 浙江德隆氟塑科技有限公司 | Production method for large-diameter polytetrafluoroethylene turning plate |
| CN109647230A (en) * | 2019-02-14 | 2019-04-19 | 江苏金由新材料有限公司 | A kind of preparation process of PTFE foamed board membrane for water treatment |
| CN111016231A (en) * | 2019-12-20 | 2020-04-17 | 江苏泰氟隆科技有限公司 | PTFE ceramic film for 5G network high-performance copper-clad plate and processing method thereof |
| CN112091245A (en) * | 2019-06-18 | 2020-12-18 | 浙江德清科赛塑料制品有限公司 | Preheating treatment process for turning PTFE (Polytetrafluoroethylene) lathe blank |
| CN112659438A (en) * | 2020-12-22 | 2021-04-16 | 梁佳鹏 | Single double-end polytetrafluoroethylene mould pressing rod machining device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104527100A (en) * | 2014-11-12 | 2015-04-22 | 浙江德清科赛塑料制品有限公司 | A manufacturing process of an ultrathin wide film from reclaimed filled polytetrafluoroethylene |
| CN105171956A (en) * | 2015-09-10 | 2015-12-23 | 湖州格尔泰斯环保技术有限公司 | Production method of polytef regeneration straps |
| CN105690786A (en) * | 2016-02-01 | 2016-06-22 | 浙江德隆氟塑科技有限公司 | Production method for large-diameter polytetrafluoroethylene turning plate |
| CN109647230A (en) * | 2019-02-14 | 2019-04-19 | 江苏金由新材料有限公司 | A kind of preparation process of PTFE foamed board membrane for water treatment |
| CN112091245A (en) * | 2019-06-18 | 2020-12-18 | 浙江德清科赛塑料制品有限公司 | Preheating treatment process for turning PTFE (Polytetrafluoroethylene) lathe blank |
| CN111016231A (en) * | 2019-12-20 | 2020-04-17 | 江苏泰氟隆科技有限公司 | PTFE ceramic film for 5G network high-performance copper-clad plate and processing method thereof |
| CN112659438A (en) * | 2020-12-22 | 2021-04-16 | 梁佳鹏 | Single double-end polytetrafluoroethylene mould pressing rod machining device |
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Application publication date: 20121205 |