CN106139918A - A kind of production method of polytetrafluoroethylhollow hollow fiber pipe - Google Patents
A kind of production method of polytetrafluoroethylhollow hollow fiber pipe Download PDFInfo
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- CN106139918A CN106139918A CN201510179943.XA CN201510179943A CN106139918A CN 106139918 A CN106139918 A CN 106139918A CN 201510179943 A CN201510179943 A CN 201510179943A CN 106139918 A CN106139918 A CN 106139918A
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Abstract
The present invention relates to the production method of a kind of polytetrafluoroethylhollow hollow fiber pipe, due to PTFE material self character, make the PTFE hollow-fibre membrane can be in widely temperature range, use under conditions of more complicated, through calendering, after longitudinal stretching and radial dilatation, PTFE hollow-fibre membrane has the microcellular structure of uniqueness, internal layer aperture is more than outer layer aperture, porosity is also more uniform, by changing the multiplying power of longitudinal stretching and radial dilatation, the micro pore shape of PTFE hollow-fibre membrane can be controlled, require according to different uses, the product of different pore size can be produced, effectively improve the quality of production and production efficiency, save production cost.
Description
Technical field
The present invention relates to the production method of a kind of polytetrafluoroethylhollow hollow fiber pipe.
Background technology
Current Hollow-fibre membranes material mainly includes the organic film classes such as PVDF, PP, PE, PVC and the inorganic ceramic membrane such as aluminum oxide, zirconium oxide two class, preparation method mainly includes spin processes and embrane method of casting/be applied as. wherein using solution-polymerized SBR phase separation method to prepare hollow-fibre membrane is the most frequently used preparation method, as PVDF adopts in this way more.PP, PE hollow-fibre membrane then uses melt spinning pulling method.
Organic film manufacture craft is simple, convenient, and film product is yielding, and the filling density of membrane module is high.But case of thermal instability, non-refractory, easily swelling in a liquid, intensity is low；Inoranic membrane is indeformable, high temperature resistant, organic solvent-resistant, and rigidity and mechanical strength are good, but complicated process of preparation.
PE hollow-fibre membrane odorless, nontoxic, heat resistance is general (-70 DEG C-100 DEG C), is resistant to the erosion of most of soda acid, oxidation resistent susceptibility difference, heat aging property difference.
PP doughnut film-strength, rigidity, heat resistance are superior to PE(and can use under the conditions of 100 DEG C), but become fragile during low temperature, not wear-resisting, easily aging, oxidation resistent susceptibility difference.
PVC hollow-fibre membrane poor toughness, easily decomposes under the conditions of having oxide.
PVDF hollow-fibre membrane has good chemical stability, heat resistance, mechanical strength, can under the conditions of-40 DEG C 150 DEG C Long-Time Service.Owing to PVDF hollow-fibre membrane ectonexine microcellular structure is consistent, backwash after membrane micropore blocking is caused during use to go removal of impurity operation easier bigger.
PTFE hollow-fibre membrane has the advantages such as the resistance to acids and bases, resistant of high or low temperature (-180 DEG C 260 DEG C), skin-friction coefficient that intensity is high, porosity is high, fabulous is low.Huge at the extraordinary filtration art application potential such as GAS ABSORPTION, Membrane Materials, membrane bioreactor, ozone dissolution filter, sewage disposal, water-oil separating, desalinization.The processing difficulties of this film essentially consists in microcellular structure control and shaping, and the first paste-extruded after-drawing method of external many employings, such as SUMITOMO CHEMICAL Poreflon, U.S. Gere, U.S. Parker Advantage PF.The domestic research to PTFE hollow-fibre membrane is less, and Xiao Changfa uses gel spinning to prepare PTFE/CaCO3 hydridization hollow-fibre membrane.
Content of the invention
For solving the problems referred to above, it is an object of the invention to provide the production method of a kind of polytetrafluoroethylhollow hollow fiber pipe.
The technical scheme is that the production method of a kind of polytetrafluoroethylhollow hollow fiber pipe, its production stage includes:
(1) raw material sieves: sieve the PTFE dispersion resin screen cloth of storage；
(2) extruding adjuvant is admixed: the PTFE dispersion resin that sieves is added and is dried, in clean wide-mouth bottle, adds extruding to assist toward resin in, then by lid lid；It is to stir on the mixer of 20rpm that wide-mouth bottle is placed on rotating speed, and stirring is placed 24 hours after completing；
(3) pre-molding: powder is pressed into the shape that can load squeeze cylinder；
(4) pushing extrusion: load material base in squeeze cylinder, allowing it force to release from mouth die to push tubulose prefabrication by the pushing of plunger, during pushing, PTFE dispersion resin becomes the fibre structure aligning；
(5) roll: before calendering, tubing is placed and heats in the hot water, parison is softened；Parison is rolled by the rotating speed of control stack and surface temperature；
(6) dry: the pushing adjuvant removing in prefabrication before carrying out longitudinal stretching；Being dried inlet temperature and being set to 100 DEG C, outlet temperature is set to 250 DEG C；
(7) longitudinal stretching: the semi-finished product after drying carry out longitudinal stretching；Draw ratio, temperature and speed all produce impact to PTFE hollow fiber film structure；Draw ratio is higher, and film average pore size and porosity are bigger, and bubble point is lower, and water flux is bigger, and filtering accuracy is lower；Draft temperature is higher, and film average pore size and porosity are bigger, and bubble point is lower, and water flux is bigger, and filtering accuracy is lower；Draw speed increases, and film average pore size diminishes, and bubble point increases；
(8) radial dilatation: the semi-finished product microcellular structure after longitudinal stretching is sleeve configuration, enters conduct and expands to change micro pore shape；Expansion multiple, temperature and speed all produce impact to PTFE hollow-fibre membrane microcellular structure.
Optimally, screen cloth mesh size is 8 mesh-10 mesh.
Optimally, mixing time is 15 minutes-25 minutes.
Optimally, placing environment after stirring completes is 25 DEG C-30 DEG C.
Optimally, the pre-molding stage, powder is compressed to cylindric, and preload pressure is 4Mpa-6Mpa, and precompressed speed is 30mm/min.
Optimally, precompression cylinder diameter than squeeze cylinder diameter little 1mm-1.5mm.
Optimally, calendering stage, the hot water temperature for heating is 60 DEG C-80 DEG C.
Optimally, calendering stage rotating speed is 1.5m/min-4m/min.
Optimally, calendering stage stack temperature is 70 DEG C-90 DEG C.
The present invention is after calendering, longitudinal stretching and radial dilatation, and PTFE hollow-fibre membrane has the microcellular structure of uniqueness, and internal layer aperture is more than outer layer aperture, and porosity is also more uniform.By changing the multiplying power of longitudinal stretching and radial dilatation, the micro pore shape of PTFE hollow-fibre membrane can be controlled, require according to different uses, the product of different pore size can be produced.
Screen cloth mesh size of the present invention is 8 mesh-10 mesh, according to different operating needs, chooses various sizes of screen cloth, meets multiple work requirements, practical.
Mixing time of the present invention is 15 minutes-25 minutes, practices every conceivable frugality the time while improving mixing effect, at this moment between in the range of be stirred reaching preferable mixing effect, improve operating efficiency and the quality of production.
It is 25 DEG C-30 DEG C that present invention stirring places environment after completing, and through a large amount of it was verified that place in this temperature range, the effect that adjuvant can fully penetrate into interlaminar resin is more preferable, improves the quality of production.
The pre-molding stage of the present invention, powder is compressed to cylindric, preload pressure is 4Mpa-6Mpa, and precompressed speed is 30mm/min, cylindric conveniently suppresses, and fit easily in squeeze cylinder, preload pressure within this range makes pre-molding better, and precompressed speed is set as 30mm/min, improves pre-compressed effect and precompressed quality, simple, practical.
Precompression cylinder diameter of the present invention little 1mm-1.5mm than squeeze cylinder diameter, uses matched in clearance form, it is simple to pre-molding product load squeeze cylinder, simple, improve production efficiency.
Calendering stage of the present invention, the hot water temperature for heating is 60 DEG C-80 DEG C, is proven, and in this temperature range, parison bating effect more preferably, effectively improves the quality of production.
Calendering stage rotating speed of the present invention is 1.5m/min-4m/min, and in this range of speeds, rolling effect is good, and calendering efficiency is high, improves operating efficiency and the quality of production, practical.
Calendering stage stack temperature of the present invention is 70 DEG C-90 DEG C, and stack temperature is set in this scope, effectively improves rolling effect and calendering quality, and easy temperature control system, practical.
Detailed description of the invention
Illustrate the present invention below by embodiment, embodiment illustrates as a example by the production method of polytetrafluoroethylhollow hollow fiber pipe.
Embodiment 1:
The technical scheme is that the production method of a kind of polytetrafluoroethylhollow hollow fiber pipe, its production stage includes: (1) raw material sieves: sieve the PTFE dispersion resin screen cloth of storage；(2) extruding adjuvant is admixed: the PTFE dispersion resin that sieves is added and is dried, in clean wide-mouth bottle, adds extruding to assist toward resin in, then by lid lid；It is to stir on the mixer of 20rpm that wide-mouth bottle is placed on rotating speed, and stirring is placed 24 hours after completing；(3) pre-molding: powder is pressed into the shape that can load squeeze cylinder；(4) pushing extrusion: load material base in squeeze cylinder, allowing it force to release from mouth die to push tubulose prefabrication by the pushing of plunger, during pushing, PTFE dispersion resin becomes the fibre structure aligning；(5) roll: before calendering, tubing is placed and heats in the hot water, parison is softened；Parison is rolled by the rotating speed of control stack and surface temperature；(6) dry: the pushing adjuvant removing in prefabrication before carrying out longitudinal stretching；Being dried inlet temperature and being set to 100 DEG C, outlet temperature is set to 250 DEG C；(7) longitudinal stretching: the semi-finished product after drying carry out longitudinal stretching；Draw ratio, temperature and speed all produce impact to PTFE hollow fiber film structure；Draw ratio is higher, and film average pore size and porosity are bigger, and bubble point is lower, and water flux is bigger, and filtering accuracy is lower；Draft temperature is higher, and film average pore size and porosity are bigger, and bubble point is lower, and water flux is bigger, and filtering accuracy is lower；Draw speed increases, and film average pore size diminishes, and bubble point increases；(8) radial dilatation: the semi-finished product microcellular structure after longitudinal stretching is sleeve configuration, enters conduct and expands to change micro pore shape；Expansion multiple, temperature and speed all produce impact to PTFE hollow-fibre membrane microcellular structure, and screen cloth mesh size is 8 mesh, and mixing time is 15 minutes, it is 25 DEG C that stirring places environment after completing, in the pre-molding stage, powder is compressed to cylindric, and preload pressure is 4Mpa, precompressed speed is 30mm/min, precompression cylinder diameter little 1mm than squeeze cylinder diameter, calendering stage, the hot water temperature for heating is 60 DEG C, calendering stage rotating speed is 1.5m/min, and calendering stage stack temperature is 70 DEG C.
Embodiment 2:
The distinguishing characteristics of the present embodiment and embodiment 1 is, the screen cloth mesh size of the present embodiment is 10 mesh.
Embodiment 3:
The distinguishing characteristics of the present embodiment and embodiment 1 is, the mixing time of the present embodiment is 25 minutes.
Embodiment 4:
The distinguishing characteristics of the present embodiment and embodiment 1 is, the hot water temperature for heating of the present embodiment is 80 DEG C.
Embodiment 5:
The distinguishing characteristics of the present embodiment and embodiment 1 is, the preload pressure of the present embodiment is 6Mpa.
Embodiment 6:
The distinguishing characteristics of the present embodiment and embodiment 1 is, the precompression cylinder diameter of the present embodiment little 1.5mm than squeeze cylinder diameter.
Embodiment 7:
The distinguishing characteristics of the present embodiment and embodiment 1 is, the hot water temperature for heating of the present embodiment is 80 DEG C.
Embodiment 8:
The distinguishing characteristics of the present embodiment and embodiment 1 is, the calendering stage rotating speed of the present embodiment is 4m/min.
Embodiment 9:
The distinguishing characteristics of the present embodiment and embodiment 1 is, the calendering stage stack temperature of the present embodiment is 90 DEG C.
The above, be only to presently preferred embodiments of the present invention, be not the restriction doing other forms to the present invention, and any those skilled in the art are changed possibly also with the technology contents of the disclosure above or are modified as the Equivalent embodiments of equivalent variations.But, every without departing from the present invention program content, the technical spirit of the foundation present invention, to any simple modification made for any of the above embodiments, equivalent variations and remodeling, still falls within protection scope of the present invention.
Claims (9)
1. a production method for polytetrafluoroethylhollow hollow fiber pipe, its production stage includes:
(1) raw material sieves: sieve the PTFE dispersion resin screen cloth of storage；
(2) extruding adjuvant is admixed: the PTFE dispersion resin that sieves is added and is dried, in clean wide-mouth bottle, adds extruding to assist toward resin in, then by lid lid；It is to stir on the mixer of 20rpm that wide-mouth bottle is placed on rotating speed, and stirring is placed 24 hours after completing；
(3) pre-molding: powder is pressed into the shape that can load squeeze cylinder；
(4) pushing extrusion: load material base in squeeze cylinder, allowing it force to release from mouth die to push tubulose prefabrication by the pushing of plunger, during pushing, PTFE dispersion resin becomes the fibre structure aligning；
(5) roll: before calendering, tubing is placed and heats in the hot water, parison is softened；Parison is rolled by the rotating speed of control stack and surface temperature；
(6) dry: the pushing adjuvant removing in prefabrication before carrying out longitudinal stretching；Being dried inlet temperature and being set to 100 DEG C, outlet temperature is set to 250 DEG C；
(7) longitudinal stretching: the semi-finished product after drying carry out longitudinal stretching；Draw ratio, temperature and speed all produce impact to PTFE hollow fiber film structure；Draw ratio is higher, and film average pore size and porosity are bigger, and bubble point is lower, and water flux is bigger, and filtering accuracy is lower；Draft temperature is higher, and film average pore size and porosity are bigger, and bubble point is lower, and water flux is bigger, and filtering accuracy is lower；Draw speed increases, and film average pore size diminishes, and bubble point increases；
(8) radial dilatation: the semi-finished product microcellular structure after longitudinal stretching is sleeve configuration, enters conduct and expands to change micro pore shape；Expansion multiple, temperature and speed all produce impact to PTFE hollow-fibre membrane microcellular structure.
2. the production method of polytetrafluoroethylhollow hollow fiber pipe according to claim 1, it is characterised in that: screen cloth mesh size is 8 mesh-10 mesh.
3. the production method of polytetrafluoroethylhollow hollow fiber pipe according to claim 1, it is characterised in that: mixing time is 15 minutes-25 minutes.
4. the production method of polytetrafluoroethylhollow hollow fiber pipe according to claim 1, it is characterised in that: it is 25 DEG C-30 DEG C that stirring places environment after completing.
5. the production method of polytetrafluoroethylhollow hollow fiber pipe according to claim 1, it is characterised in that: in the pre-molding stage, powder is compressed to cylindric, and preload pressure is 4Mpa-6Mpa, and precompressed speed is 30mm/min.
6. the production method of polytetrafluoroethylhollow hollow fiber pipe according to claim 1 or 5, it is characterised in that: precompression cylinder diameter little 1mm-1.5mm than squeeze cylinder diameter.
7. the production method of polytetrafluoroethylhollow hollow fiber pipe according to claim 1, it is characterised in that: calendering stage, the hot water temperature for heating is 60 DEG C-80 DEG C.
8. the production method of polytetrafluoroethylhollow hollow fiber pipe according to claim 1, it is characterised in that: calendering stage rotating speed is 1.5m/min-4m/min.
9. the production method of polytetrafluoroethylhollow hollow fiber pipe according to claim 1, it is characterised in that: calendering stage stack temperature is 70 DEG C-90 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510179943.XA CN106139918A (en) | 2015-04-16 | 2015-04-16 | A kind of production method of polytetrafluoroethylhollow hollow fiber pipe |
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| CN201510179943.XA CN106139918A (en) | 2015-04-16 | 2015-04-16 | A kind of production method of polytetrafluoroethylhollow hollow fiber pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109458498A (en) * | 2018-12-25 | 2019-03-12 | 浙江鸿盛环保科技集团有限公司 | A kind of high intensity PTFE multiple tube and preparation method thereof |
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| CN1193060A (en) * | 1997-03-06 | 1998-09-16 | 包素文 | Water-proof air-permeable fabric and producing method thereof |
| CN101791525A (en) * | 2009-12-24 | 2010-08-04 | 北京碧水源膜科技有限公司 | Polyvinylidene fluoride hollow fiber membrane with base material and production method thereof |
| JP2010253755A (en) * | 2009-04-23 | 2010-11-11 | Nichias Corp | Extrusion mold for polytetrafluoroethylene particle-containing material, extruder for polytetrafluoroethylene particle-containing material, method of producing polytetrafluoroethylene sheet-like product, method of producing polytetrafluoroethylene porous sheet-like product, method of producing polytetrafluoroethylene sheet-like baked product, method of producing polytetrafluoroethylene porous sheet-like baked product, and polytetrafluoroethylene sheet-like baked product |
| CN104015372A (en) * | 2014-01-09 | 2014-09-03 | 宁波氟纳斯氟材科技有限公司 | Production process and device of expanded polytetrafluoroethylene board |
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2015
- 2015-04-16 CN CN201510179943.XA patent/CN106139918A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1193060A (en) * | 1997-03-06 | 1998-09-16 | 包素文 | Water-proof air-permeable fabric and producing method thereof |
| JP2010253755A (en) * | 2009-04-23 | 2010-11-11 | Nichias Corp | Extrusion mold for polytetrafluoroethylene particle-containing material, extruder for polytetrafluoroethylene particle-containing material, method of producing polytetrafluoroethylene sheet-like product, method of producing polytetrafluoroethylene porous sheet-like product, method of producing polytetrafluoroethylene sheet-like baked product, method of producing polytetrafluoroethylene porous sheet-like baked product, and polytetrafluoroethylene sheet-like baked product |
| CN101791525A (en) * | 2009-12-24 | 2010-08-04 | 北京碧水源膜科技有限公司 | Polyvinylidene fluoride hollow fiber membrane with base material and production method thereof |
| CN104015372A (en) * | 2014-01-09 | 2014-09-03 | 宁波氟纳斯氟材科技有限公司 | Production process and device of expanded polytetrafluoroethylene board |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109458498A (en) * | 2018-12-25 | 2019-03-12 | 浙江鸿盛环保科技集团有限公司 | A kind of high intensity PTFE multiple tube and preparation method thereof |
| CN109458498B (en) * | 2018-12-25 | 2024-02-27 | 浙江鸿盛新材料科技集团股份有限公司 | High-strength PTFE composite pipe and preparation method thereof |
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Application publication date: 20161123 |