CN104015372A - Production process and device of expanded polytetrafluoroethylene board - Google Patents
Production process and device of expanded polytetrafluoroethylene board Download PDFInfo
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- CN104015372A CN104015372A CN201410010632.6A CN201410010632A CN104015372A CN 104015372 A CN104015372 A CN 104015372A CN 201410010632 A CN201410010632 A CN 201410010632A CN 104015372 A CN104015372 A CN 104015372A
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Abstract
The invention discloses a production process and device of an expanded polytetrafluoroethylene board. According to the technical scheme, the production process is characterized by comprising the following steps: screening refrigerated polytetrafluoroethylene dispersion resin, adding additives according to a ratio, ripening the mixed raw materials to obtain a blank, extruding the blank to form a rod material, rolling the rod material through a two-roller shaft to form a flaky film, degreasing, drying and stretching the flaky film, longitudinal and transversely drawing the flaky film, laminating the flaky film which is drawn in two directions, pressing the flaky film to obtain a sheet, and finally trimming the sheet to obtain the board. The production process of the expanded polytetrafluoroethylene board breaks through a traditional board production process, the problems of creeping and cold flow of an ordinary board can be solved, the compression resistance, the creeping loosening rate, the compression rate, the resilience property and the like of the expanded polytetrafluoroethylene board are obviously improved, and the expanded polytetrafluoroethylene board can be widely used for sealing aerospace, medical, food and petroleum pipelines and the like and has extremely good application temperature, an anti-aging property, no toxicity, no pollution and the like.
Description
Technical field
The present invention relates to a kind of production field of polytetrafluoroethylene (PTFE) product, be specifically related to a kind of production technology and making apparatus thereof of expanded polytetrafluoroethylplate plate.
Background technology
Polytetrafluoroethylene (PTFE) is the macromolecular compound that contains fluorine atom in molecular backbone, in PTFE molecule F atom C-C key is hidden and also C-F key bond energy height stable especially, except alkali metal and fluorine element, it is not corroded by any chemicals; In PTFE molecule, F atom is symmetrical, and in C-F, two kinds of element covalency combine, and there is no free electronics in molecule, and it is neutral that whole molecule is, and makes PTFE have good dielectric properties; Because PTFE molecule has the fluorine-containing shell of one deck inertia outward, make it have outstanding not viscosity can with low coefficient of friction.
Polytetrafluoroethylene (PTFE) has outstanding excellent comprehensive performance, high temperature resistant, corrosion-resistant, sticky, self-lubricating, good dielectric properties, very low coefficient of friction; In PTFE, add any filler that can bear PTFE sintering temperature, its mechanical performance can obtain greatly to be improved; Meanwhile, keep other premium properties of PTFE; The kind of filling has glass fibre, metal, metallization oxide, graphite, molybdenum bisuphide, Tan Xian Fiber, polyimides, EKONOL etc., and abrasion performance, limit PV value can improve 1000 times.
The gasket seal that the polytetrafluoroethylene (PTFE) (PTFE) of take is main material is produced two large series products at present at home, the one, pure PTFE pad, the 2nd, modified ptfe pad, pure PTFE pad is to be raw material by adopting suspension injecting tetrafluoroethylene, the moulded board that mold pressing directly produces or cut the turning plate that (turning processing) forms by polyfluortetraethylene plate (rod): moulded board Density inhomogeneity, flexibility is poor, turning plate density is relatively even, but the impact of its processing technology, material is curled, and unfavorable ten install and use.Modified ptfe pad is in PTFE resin, to add a certain proportion of functional material to improve the performance deficiency of pure PTFE, but this series products mostly is the small dimension potted component of some direct compression moldings.
Thereby seek a kind of better encapsulant, beyond doubt when last great technical problem, and expanded PTFE (ePTFE) this type of brand-new material just.
At medical domain, expanded PTFE (ePTFE) is a kind of novel medical macromolecular materials, by special processing methods such as polyflon drawns, is made.White, high resilience and pliability, have microfibre and connect and the network structure of formation, these microfibres form countless pores, make varicosity PTFE crooked (crossing 360 °) arbitrarily, and blood compatibility is good, resistance to biological aging, for the manufacture of medical products such as artificial blood vessel, heart sticking patch.From medical angle, be current ideal biological tissue's substitute, due to its good biocompatibility and distinctive microcellular structure, nontoxic, without carcinogenic, without side effects such as sensitization, and human tissue cell and blood vessel its micropore of can growing into, formative tissue connects, as autologous tissue.
In shaping field, the varicosity material being commonly called as be entirely named as expanded PTFE surgery soft-tissue patch, English name: expended polytetrafluoroethylene is called for short (e-PTFE) surgical patch.The carbon atom long-chain of its chemical constitution for being wrapped up by fluorine atom, due to its special molecular structure, expanded PTFE is the artificial material that physicochemical property is extremely stable, simultaneously, by reaching the clinical practice of 40 years 6000000 examples, the report that comprises none routine clinical rejection after the implantation at various positions of artificial blood vessel, artificial endocranium, heart sticking patch, has fully proved that this material has good biocompatibility; Expanded PTFE is to be formed through special processing process by polytetrafluoroethyldispersion dispersion resin, has the ultra microstructure of " knot and fiber ", sees through control knot spacing and can induce autologous tissue's cell inwardly to grow; Therefore, use expanded PTFE as packing material and the organization healing mode that is not both of material maximum in the past; Be that expanded PTFE is the organization healing mode that tissue is grown into, traditional silicon rubber is the organization healing mode of fibers encapsulation; Therefore, with this material, comprise that the soft tissue of augmentation rhinoplasty operation fills operation and have outward appearance nature true to nature, prosthese is not shifted, sex change etc., the advantage of few intercurrent disease; Simultaneously again because the cell tissue amount of the micropore of growing into is very limited, therefore, if can be very not difficult in the time of need to taking out this material yet.
Industrial, expanded PTFE (ePTFE) is to adopt dispersed polytetrafluoroethylresin through special PROCESS FOR TREATMENT, make it have the pure polytetrafluoroethylmaterial material of multidirectional fiber and closed pore structure, its porosity is between 40% one 97%, its aperture reaches 0.25～0.5 micron, not only kept the splendid chemical stability of polytetrafluoroethylene (PTFE), extremely low coefficient of friction, wide serviceability temperature, fabulous ageing-resistant performance, nontoxic, the pollution-free premium properties that waits, and its fine and closely woven softness, tough fiber has also solved the common fault of PTFE stuffing materials--the problem of creep and cold flow, its high-density fiber is organized in after pressurized, fiber can tangle mutually, become organize tightr, evenly, airtight, waterproof, anti-leak performance is good, and under harsh corrosive environment, also keep splendid closed state, some chemical industry and petroleum industry impassable technical barriers for many years in producing have in the past been solved.
Yet, at present domestic ability in producing this piece field of pure expanded polytetrafluoroethylplate plate is still very weak, also there is no a set of complete production technology that can produce expanded polytetrafluoroethylplate plate and complete set production equipment, can not meet the demand of whole large industrial environment.
Summary of the invention
The deficiency existing for prior art, the invention provides a kind of production technology and making apparatus thereof of expanded polytetrafluoroethylplate plate, the production method of this complete set expanded polytetrafluoroethylplate plate and a whole set of production line equipment can be produced high performance expanded polytetrafluoroethylplate plate complete and efficiently, have filled up domestic and have produced the technical blank of expanded polytetrafluoroethylplate plate.
For achieving the above object, the invention provides following technical scheme:
A preparation method for expanded polytetrafluoroethylplate plate, it comprises following making step:
1) polytetrafluoroethyldispersion dispersion resin is first refrigerated, the temperature of refrigeration is below 18 ℃, and the time of refrigeration is more than 12 hours, then sieves;
2) in the polytetrafluoroethyldispersion dispersion resin having sieved, inject a certain proportion of auxiliary agent and carry out spice; Wherein the parts by weight ratio of polytetrafluoroethyldispersion dispersion resin and auxiliary agent is: polytetrafluoroethyldispersion dispersion resin is 70～80, and auxiliary agent is 20～30;
3) mixed material through spice is carried out to maturation, maturation temperature is 45 ℃～75 ℃, and the time of maturation is 12～72 hours;
4) mixed material after maturation is pressed into tubular blank, and tubular blank is carried out to maturation, the maturation time is 5～10 hours;
5) the tubular blank after maturation is extruded into cylindrical bar;
6) cylindrical bar is rolled into sheet film;
7) by sheet film degreasing, dry, and be drawn into semi-finished product, temperature is controlled between 200 ℃～280 ℃;
8) semi-finished product sheet film is carried out to longitudinal stretching, draft temperature is controlled between 200 ℃～280 ℃;
9) sheet film after longitudinal stretching carries out cross directional stretch;
10) sheet film after multi-disc stretching carries out superimposion moulding;
11) trimming.
Described 4) in step, the pressing pressure of blank is 2.5～5MPa, pressurize 1～5 minute again after blank moulding;
Described 5) in step, the extrusion pressure of cylindrical bar is 5～7MPa, and its compression ratio is 100～150, and temperature is controlled at 45～75 ℃;
Described 7) in step, the draw speed of sheet film is 10～12m/min, and stretching ratio is 1.1～1.2 times.
Described 8) feeding speed when semi-finished product sheet film carries out longitudinal stretching in step is 1.5～2m/min, and material recovering speed is 8～16m/min, and stretching ratio is 5～8 times.
Described 9) in step, cross directional stretch is divided into preheating section, expansion segment and sizing section, wherein the temperature of preheating section is between 120～150 ℃, the temperature of expansion segment is between 200～250 ℃, the temperature of sizing section is between 300～380 ℃, cross directional stretch speed is 12m/min～20m/min, and cross directional stretch multiplying power is identical with longitudinal stretching multiplying power.
Described 10) in step, the sheet film of multi-disc after stretching first carries out superimposion; Pass through preheating section preheating, preheat temperature is 200 ℃～250 ℃ again, and be 3～5 minutes preheating time; Then pass through exhaust section, delivery temperature is 350 ℃～380 ℃, and the time is 15～25 minutes; And then at cooling section, be cooled to 80 ℃～100 ℃; Finally move to the sizing of sizing section, temperature is 80 ℃～100 ℃, suppresses 1～2 minute.
Implement a making apparatus for the preparation method of above expanded polytetrafluoroethylplate plate, comprise respectively automatic stirring machine, maturation case, blank machine, bar extruder, calender, degreaser drying stretcher, longitudinal stretching equipment, transverse stretching equipment, superimposion equipment and bead cutter.
Described automatic stirring machine comprises spice frame, spice bucket and gas-liquid flusher;
On described spice bucket, be symmetrically arranged with deflector roll, spice bucket is rotatably set up in spice frame by deflector roll,
Described spice frame is provided with motor, between motor and deflector roll, is connected with transmission mechanism,
Described gas-liquid flusher includes the nozzle of being located in spice bucket, the batch box being connected with nozzle, and described batch box is connected with respectively auxiliary agent holding vessel and pump,
Described nozzle is connected with described pump;
Described blank machine comprises fixed mount, is located at the barrel on fixed mount, in barrel, be formed with for the accommodating cavity volume of blank, the movable briquetting that is provided with in corresponding blank both sides in barrel, barrel two ends are respectively equipped with cylinder body, cylinder body is connected with the push rod that can promote briquetting, push rod is provided with magnet ring, and fixed mount is provided with the magnetic inductor that can coordinate with magnet ring;
Described bar extruder comprises extruder frame, be located at heat-preserving container in extruder frame, be located at the extruded tube in heat-preserving container, is provided with insulation oil in heat-preserving container,
Extruded tube corresponding ground one side is provided with taper guiding mouth and mouthful mould, and bar extruder also comprises the rotating disk that corresponding mouthful mould arranges,
The movable briquetting that is provided with of opposite side of corresponding mouthful mould in described extruded tube, the opposite side of the corresponding mouthful mould of extruded tube is provided with cylinder body, and cylinder body is connected with the push rod that can promote briquetting;
Described calender comprises support, is set up in calendering discharging device, calendering roll shaft and calendering material collecting device on support, and the corresponding calendering of calendering roll shaft discharging device position is provided with guide plate;
Described degreaser drying stretcher comprises degreasing discharge mechanism, degreasing baking oven, buffering drying section, drawing oven and degreasing receiving mechanism, degreasing discharge mechanism, degreasing baking oven, buffering drying section, drawing oven and degreasing receiving mechanism have included some roll shafts, and described degreasing baking oven is circumscribed with auxiliary agent retracting device.
Described longitudinal stretching equipment comprises longitudinal feed mechanism, heated oven, buffering cooling body and longitudinal receiving mechanism, longitudinally feed mechanism, buffering cooling body and longitudinal receiving mechanism have included some roll shafts, described heated oven comprises casing, is located at the heating system in casing and is set up in biconial curve roller in casing, the roll shaft that described biconial curve roller comprises roller and is symmetrically set in roller both sides, described roller is ellipsoid shape.
Described transverse stretching equipment comprises thermal-insulating body, is divided into horizontal feed mechanism and the horizontal receiving mechanism of thermal-insulating body both sides, is provided with heating system and chain drive in described thermal-insulating body;
On described chain drive, be evenly equipped with the fixture that can clamp sheet film, corresponding laterally feed mechanism one side of described thermal-insulating body is provided with the clamp mechanism that closes that can closed fixture, and corresponding laterally receiving mechanism one side of thermal-insulating body is provided with the clamp mechanism of opening that can opened clamping apparatus;
Described thermal-insulating body comprises mutually heat insulation successively preheating section, expansion segment and sizing section, and described chain drive comprises the conveyer chain being symmetrically set in thermal-insulating body,
In described preheating section, conveyer chain is set in parallel;
In described expansion segment, the spacing between conveyer chain is expanded gradually from preheating section one side to sizing section one side;
In described sizing section, spacing self expandable section one side between conveyer chain to horizontal receiving mechanism one side is drawn in gradually.
Described superimposion equipment comprises workbench, is movablely located at fixture on workbench, is located at stone section, exhaust profiled section and the sizing section on workbench respectively;
Described stone section includes unreeling structure, can continuously sheet film be laid on to the reciprocal laying mechanism on fixture;
The exhaust roll shaft that described exhaust profiled section includes casing, is located at the heater in casing and can pushes sheet film;
Described sizing section includes the pressing plate of the expanded polytetrafluoroethylplate plate of can suppressing and shape.
This invents a complete set of manufacturing technique method and production equipment by our company's designed, designed, research and development installation and debugging, can produce complete and efficiently pure expanded polytetrafluoroethylplate plate at present, and the expanded polytetrafluoroethylplate plate making all reaches domestically leading standard on hot strength, elongation at break, compression ratio, rebound degree, sealing leak rate etc. indices, even catches up with and surpasses foreign standard; The expanded polytetrafluoroethylplate plate making in addition has self exclusive creep resistant and anti-cold flow characteristic, be easy to cutting, be convenient to install, the characteristic of long service life makes it in nearly all sealing occasion, obtain practical application, except few chemical substance, it can not react with other chemical substances, thereby is applicable to any chemical seal occasion, in 600 ℉ (315 ℃) all sealings below temperature, needs all can be met.
Accompanying drawing explanation
Fig. 1 is the structural representation of automatic stirring machine of the present invention;
Fig. 2 is the structural representation of blank machine of the present invention;
Fig. 3 is the structural representation of bar extruder of the present invention;
Fig. 4 is the structural representation of calender of the present invention;
Fig. 5 is the structural representation of degreaser drying stretcher of the present invention;
Fig. 6 is the structural representation of longitudinal stretching equipment of the present invention;
Fig. 7 is the structural representation of transverse stretching equipment of the present invention;
Fig. 8 is the structural representation of superimposion equipment of the present invention;
Fig. 9 is the schematic flow sheet of the production technology of expanded polytetrafluoroethylplate plate of the present invention.
Reference numeral: 1, automatic stirring machine; 11, spice frame; 111, transmission mechanism; 112, motor; 12, spice bucket; 121, deflector roll; 122, import and export; 13, gas-liquid flusher; 131, nozzle; 132, batch box; 133, auxiliary agent holding vessel; 134, pump; 135, conduit; 136, check valve; 2, blank machine; 21, fixed mount; 22, barrel; 23, briquetting; 24, cylinder body; 25, push rod; 26, magnet ring; 27, magnetic inductor; 3, bar extruder; 31, extruder frame; 32, heat-preserving container; 33, extruded tube; 34, taper guiding mouth; 35, mouthful mould; 36, rotating disk; 37, briquetting; 38, push rod; 39, cylinder body; 4, calender; 41, support; 42, calendering discharging device; 43, calendering roll shaft; 44, guide plate; 45, calendering material collecting device; 5, degreaser drying stretcher; 51, degreasing discharge mechanism; 52, degreasing baking oven; 53, buffering drying section; 531, blower fan; 54, drawing oven; 55, degreasing receiving mechanism; 56, auxiliary agent retracting device; 57, heater; 6, longitudinal stretching equipment; 61, longitudinal feed mechanism; 62, heated oven; 621, heating system; 622, biconial curve roller; 63, buffering cooling body; 64, longitudinal receiving mechanism; 7, transverse stretching equipment; 71, thermal-insulating body; 72, horizontal feed mechanism; 73, horizontal receiving mechanism; 74, chain drive; 741, conveyer chain; 75, fixture; 76, close clamp mechanism; 77, open clamp mechanism; 78, width adjustment device; 8, superimposion equipment; 81, workbench; 811, guide rail; 82, fixture; 83, unreeling structure; 84, back and forth lay mechanism; 85, exhaust roll shaft; 86, pressing plate; 87, cylinder; 871, compacting roll shaft; 88, counter; 89, hydraulic stem.
The specific embodiment
Referring to figs. 1 through Fig. 9, the production technology of expanded polytetrafluoroethylplate plate of the present invention and making apparatus embodiment thereof are described further.
A preparation method for expanded polytetrafluoroethylplate plate, it comprises following making step:
1) polytetrafluoroethyldispersion dispersion resin is first refrigerated, the temperature of refrigeration is below 18 ℃, and the time of refrigeration is more than 12 hours, then sieves;
2) in the polytetrafluoroethyldispersion dispersion resin having sieved, inject a certain proportion of auxiliary agent and carry out spice; Wherein the parts by weight ratio of polytetrafluoroethyldispersion dispersion resin and auxiliary agent is: polytetrafluoroethyldispersion dispersion resin is 70～80, and auxiliary agent is 20～30;
3) mixed material through spice is carried out to maturation, maturation temperature is 45 ℃～75 ℃, and the time of maturation is 12～72 hours;
4) mixed material after maturation is pressed into tubular blank, and tubular blank is carried out to maturation, the maturation time is 5～10 hours;
5) the tubular blank after maturation is extruded into cylindrical bar;
6) cylindrical bar is rolled into sheet film;
7) by sheet film degreasing, dry, and be drawn into semi-finished product, temperature is controlled between 200 ℃～280 ℃;
8) semi-finished product sheet film is carried out to longitudinal stretching, draft temperature is controlled between 200 ℃～280 ℃;
9) sheet film after longitudinal stretching carries out cross directional stretch;
10) sheet film after multi-disc stretching carries out superimposion moulding;
11) trimming.
Described 4) in step, the pressing pressure of blank is 2.5～5MPa, pressurize 1～5 minute again after blank moulding;
Described 5) in step, the extrusion pressure of cylindrical bar is 5～7MPa, and its compression ratio is 100～150, and temperature is controlled at 45～75 ℃;
Described 7) in step, the draw speed of sheet film is 10～12m/min, and stretching ratio is 1.1～1.2 times.
Described 8) feeding speed when semi-finished product sheet film carries out longitudinal stretching in step is 1.5～2m/min, and material recovering speed is 8～16m/min, and stretching ratio is 5～8 times.
Described 9) in step, cross directional stretch is divided into preheating section, expansion segment and sizing section, wherein the temperature of preheating section is between 120～150 ℃, the temperature of expansion segment is between 200～250 ℃, the temperature of sizing section is between 300～380 ℃, cross directional stretch speed is 12m/min～20m/min, and cross directional stretch multiplying power is identical with longitudinal stretching multiplying power.
Described 10) in step, the sheet film of multi-disc after stretching first carries out superimposion; Pass through preheating section preheating, preheat temperature is 200 ℃～250 ℃ again, and be 3～5 minutes preheating time; Then pass through exhaust section, delivery temperature is 350 ℃～380 ℃, and the time is 15～25 minutes; And then at cooling section, be cooled to 80 ℃～100 ℃; Finally move to the sizing of sizing section, temperature is 80 ℃～100 ℃, suppresses 1～2 minute.
Implement a making apparatus for the preparation method of above expanded polytetrafluoroethylplate plate, comprise respectively automatic stirring machine 1, maturation case, blank machine 2, bar extruder 3, calender 4, degreaser drying stretcher 5, longitudinal stretching equipment 6, transverse stretching equipment 7, superimposion equipment 8 and bead cutter.
Described automatic stirring machine comprises spice frame 11, spice bucket 12 and gas-liquid flusher 13;
On described spice bucket 12, be symmetrically arranged with deflector roll 121, spice bucket 12 is rotatably set up in spice frame 11 by deflector roll 121,
Described spice frame 11 is provided with motor 112, between motor 112 and deflector roll 121, is connected with transmission mechanism 111,
Described gas-liquid flusher 13 includes the nozzle 131 of being located in spice bucket 12, the batch box 132 being connected with nozzle 131, and described batch box 132 is connected with respectively auxiliary agent holding vessel 133 and pump 134,
Described nozzle 131 is connected with described pump 134;
Described blank machine 2 comprises fixed mount 21, is located at the barrel 22 on fixed mount 21, in barrel 22, be formed with for the accommodating cavity volume of blank, the movable briquetting 23 that is provided with in the interior corresponding blank of barrel 22 both sides, barrel 22 two ends are respectively equipped with cylinder body 24, cylinder body 24 is connected with the push rod 25 that can promote briquetting 23, push rod 25 is provided with magnet ring 26, and fixed mount 21 is provided with the magnetic inductor 27 that can coordinate with magnet ring 26;
Described bar extruder 3 comprises extruder frame 31, be located at heat-preserving container 32 in extruder frame 31, be located at the extruded tube 33 in heat-preserving container 32, is provided with insulation oil in heat-preserving container 32,
Extruded tube 33 corresponding ground one sides are provided with taper guiding mouth 34 and mouthful mould 35, and bar extruder 3 also comprises the rotating disk 36 that corresponding mouthful mould 35 arranges,
The movable briquetting 37 that is provided with of opposite side of the interior corresponding mouthful mould 35 of described extruded tube 33, the opposite side of extruded tube 33 corresponding mouthful moulds 35 is provided with cylinder body 39, and cylinder body 39 is connected with the push rod 38 that can promote briquetting 37;
Described calender 4 comprises support 41, is set up in calendering discharging device 42, calendering roll shaft 43 and calendering material collecting device 45 on support 41, and the corresponding calendering of calendering roll shaft 43 discharging device 42 positions are provided with guide plate 44;
Described degreaser drying stretcher 5 comprises degreasing discharge mechanism 51, degreasing baking oven 52, buffering drying section 53, drawing oven 54 and degreasing receiving mechanism 55, degreasing discharge mechanism 51, degreasing baking oven 52, buffering drying section 53, drawing oven 54 and degreasing receiving mechanism 55 have included some roll shafts, and described degreasing baking oven 52 is circumscribed with auxiliary agent retracting device 56.
Described longitudinal stretching equipment 6 comprises longitudinal feed mechanism 61, heated oven 62, buffering cooling body 63 and longitudinal receiving mechanism 64, longitudinally feed mechanism 61, buffering cooling body 63 and longitudinal receiving mechanism 64 have included some roll shafts, described heated oven 62 comprises casing, is located at the heating system 621 in casing and is set up in biconial curve roller 622 in casing, the roll shaft that described biconial curve roller 622 comprises roller and is symmetrically set in roller both sides, described roller is ellipsoid shape.
Described transverse stretching equipment 7 comprises thermal-insulating body 71, is divided into horizontal feed mechanism 72 and the horizontal receiving mechanism 73 of thermal-insulating body 71 both sides, is provided with heating system and chain drive 74 in described thermal-insulating body 71;
On described chain drive 74, be evenly equipped with the fixture 75 that can clamp sheet film, corresponding laterally feed mechanism 72 1 sides of described thermal-insulating body 71 be provided with can closed fixture 75 close clamp mechanism 76, corresponding laterally receiving mechanism 73 1 sides of thermal-insulating body 71 be provided with can opened clamping apparatus 75 open clamp mechanism 77;
Described thermal-insulating body 71 comprises mutually heat insulation successively preheating section, expansion segment and sizing section, and described chain drive 74 comprises the conveyer chain 741 being symmetrically set in thermal-insulating body 71,
In described preheating section, conveyer chain 741 is set in parallel;
In described expansion segment, the spacing between conveyer chain 741 is expanded gradually from preheating section one side to sizing section one side;
In described sizing section, spacing self expandable section one side between conveyer chain 741 to horizontal receiving mechanism 73 1 sides are drawn in gradually.
Described superimposion equipment 8 comprises workbench 81, is movablely located at fixture 82 on workbench 81, is located at stone section, exhaust profiled section and the sizing section on workbench 81 respectively;
Described stone section includes unreeling structure 83, can continuously sheet film be laid on to the reciprocal laying mechanism 84 on fixture 82;
The exhaust roll shaft 85 that described exhaust profiled section includes casing, is located at the heater in casing and can pushes sheet film;
Described sizing section includes the pressing plate 86 of the expanded polytetrafluoroethylplate plate of can suppressing and shape.
Embodiment:
1) first put polytetrafluoroethyldispersion dispersion resin into refrigerating chamber and refrigerate, as preferably, the temperature of refrigeration is below 18 ℃, the time of refrigeration is more than 12 hours, then sieve, it should be noted that screening must carry out at identical temperature herein;
2) polytetrafluoroethyldispersion dispersion resin having sieved is weighed, pour in automatic stirring machine 1, automatic stirring machine 1 comprises spice frame 11, spice bucket 12 and gas-liquid flusher 13, spice bucket 12 is rotatably set up in spice frame 11 by deflector roll 121, as preferably, spice bucket 12 is biconial setting, and made by stainless steel cylinder, on spice bucket 12, offer and import and export 122, the polytetrafluoroethyldispersion dispersion resin having sieved is poured in spice bucket 12 from importing and exporting 122, at a certain proportion of auxiliary agent of the interior injection of auxiliary agent holding vessel 133, (it should be noted that again herein, this auxiliary agent can be kerosene, ether, solvent naphtha, benzinum, or a kind of or more than one mixing in paraffin oil), wherein the parts by weight ratio of polytetrafluoroethyldispersion dispersion resin and auxiliary agent is: polytetrafluoroethyldispersion dispersion resin is 70～80, auxiliary agent is 20～30, now can carry out spice, spice bucket 12 rotates under the driving of motor 112 and transmission mechanism 111, the rotating speed of its rotation is 5～10 revs/min, now, auxiliary agent in auxiliary agent holding vessel 133 flows in batch box 132, as preferably, auxiliary agent holding vessel 133 is positioned at the top of batch box 132, auxiliary agent automatically flows in batch box 132 under the effect of gravity, and batch box 132 pushes to nozzle 131 places by auxiliary agent under the pressure of pump 134 promotes, meanwhile, pump 134 is directly connected with nozzle 131, gas is sprayed from nozzle 131, auxiliary agent is directly sprayed onto to polytetrafluoroethyldispersion dispersion resin surface with vaporific form, the blended absorbent that makes its feed particles and auxiliary agent is uniform and complete more, you need to add is that, pump 134, batch box 132, connection between auxiliary agent holding vessel 133 and nozzle 131 all realizes by conduit 135, and conduit 135 can be arranged in the deflector roll 121 on spice bucket 12, as preferably, between auxiliary agent holding vessel 133 and batch box 132, between batch box 132 and nozzle 131, between pump 134 and batch box 132, between pump 134 and nozzle 131, be equipped with check valve 136, can realize the control to whole flow process.
3) pour in special-purpose heat-preserving container after the mixed material after stirring is weighed, and be positioned over and in maturation case, carry out maturation, as preferably, maturation temperature is 45 ℃～75 ℃, and the time of maturation is 12～72 hours.
4) mixed material of the polytetrafluoroethyldispersion dispersion resin after maturation and auxiliary agent is made tubular blank, as preferably, blank machine 2 adopts two-way hydraulic cylinder to drive push rod 25 to promote briquetting 23, and is controlled and suppressed equal altitudes, isopycnic tubular blank by magnetic induction, and its specific operation process is as follows:
A certain amount of mixed material is poured in the cavity volume of barrel 22, as preferably, by cylinder body 24, the pressure that is hydraulic cylinder is adjusted to 2.5～5MPa, the cylinder body 24 that is positioned at barrel 22 tops promotes push rods 25 and walks to fast briquetting 23 places and transfer to and push at a slow speed briquetting 23, when moving to magnetic inductor 27 setting height, magnet ring 26 stops, and then the cylinder body 24 that is positioned at barrel 22 belows promotes push rod 25, briquetting 23 is pushed at a slow speed, when moving to magnetic inductor 27 setting height, magnet ring 26 stops, now blank is compressing, as preferably, keep again pressure 1～5 minute, base completes and (it should be noted that herein, as best preferred version of the present invention, the surrounding of barrel 22 is distributed with the steam vent of some, when blank is suppressed, can be by the air in the abundant emptying graininess of steam vent or powdery mixed material, guarantee the density uniformity of blank), now be positioned at cylinder body 24 returns of barrel 22 tops, the cylinder body 24 that is positioned at barrel 22 belows ejects cavity volume by blank, finally blank is put into maturation case and carried out maturation, as preferably, the maturation time is 5～10 hours.
5) blank after maturation is pushed in extruded tube 33, be extruded into the cylindrical bar of certain diameter, and cylindrical bar rolling on rotating disk 36, as preferably, extrusion pressure is 5～7MPa, and extrusion temperature is 45～75 ℃, the heating of employing recycle oil, make extruded tube 33 barrel temperatures more even, make cylindrical bar soft durometer, density and the uniformity extruded more meet standard, its specific operation process is as follows:
Extruded tube 33 is positioned at heat-preserving container 32, in heat-preserving container 32, fill with heating oil, as preferably, adopt external recycle oil heating system to carry out constant temperature to the heating oil in heat-preserving container 32, blank after maturation is pushed in extruded tube 33, open cylinder body 39, as preferably selecting liquid pump as power, and be adjusted to predetermined pressure, cylinder body 39 promotes push rod 38 and moves to fast briquetting 37 places, and be converted to and push at a slow speed briquetting 37, until the blank in extruded tube 33 is all extruded to rear return, cylindrical bar when extruding by rolling in rotating disk 36, you need to add is that herein, extruded tube 33 corresponding ground one sides are provided with taper guiding mouth 34 and mouthful mould 35, wherein as preferred, the tapering of bevel angle is 15～20 degree, and the compression ratio of cylindrical bar is 100～150.
6) the cylindrical bar of extruding and rotating disk are removed to calendering discharging device 42 places, start calendering, during calendering, first calendering roll shaft 43 is preheated to 60～80 ℃, mode of heating can be oil heating, electrical heating or Steam Heating etc., then cylindrical bar is pushed in guide plate 44, as preferably, adopt two calendering roll shafts 43, the sheet film that cylindrical bar is rolled into certain thickness and width by double-roller (it should be noted that herein, the thickness of sheet film and width can be decided according to the actual requirements, can determine product variety according to thickness and the width of the compacting of different size miillpore filter), then by calendering material collecting device 45, the sheet film after calendering is carried out to rolling.
7) sheet film after calendering is delivered to degreasing discharge mechanism 51 places, by roll shaft, be delivered in degreasing baking oven 52, as preferably, in degreasing baking oven 52, be provided with heater 57, temperature in degreasing baking oven 52 is controlled between 200～280 ℃, sheet film carries out degreasing work in this stage, by sheet film out in degreasing baking oven 52, by roll shaft, being delivered to buffering drying section 53 is dried, preferably, buffering drying section 53 is also provided with blower fan 531, be convenient to the dry of sheet film, then sheet film is transported in drawing oven 54, preferably, in drawing oven 54, be provided with heater 57, temperature in drawing oven 54 is controlled between 200～280 ℃, by roll shaft, under uniform temperature and speed, sheet film is stretched, as best preferred version of the present invention, the speed that appeal stretches is 10～12m/min, stretch ratio is 1.1～1.2 times, finally by degreasing receiving mechanism 55, the sheet film after stretching is carried out to rolling work, as preferably, degreasing baking oven 52 is also circumscribed with auxiliary agent retracting device 56, realize the recycling of auxiliary agent, greatly reduce production cost, while protection of the environment, reduce and pollute.
8) semi-finished product sheet film is delivered to longitudinal feed mechanism 61 places, by roll shaft, semi-finished product sheet film is delivered in heated oven 62, as best preferred version of the present invention, this roll shaft is biconial curve roller 622, its roller is ellipsoid shape, and in heated oven 62, be provided with heating system 621, temperature in heated oven 62 is controlled between 200～280 ℃, semi-finished product sheet film carries out longitudinal stretching in heated oven 62 by biconial curve roller 622, then the sheet film after heated oven 62 in-draws be sent on buffering cooling body 63, carry out cooling, finally by longitudinal receiving mechanism 64, the sheet film after longitudinal stretching is carried out to rolling, as best preferred version of the present invention, feeding speed during longitudinal stretching is set to 1.5～2m/min, material recovering speed is 8～16m/min, the multiplying power stretching is 5～8 times.
9) sheet film after longitudinal stretching carries out cross directional stretch, cross directional stretch is divided into preheating section, expansion segment and sizing section, wherein the temperature of preheating section is between 120～150 ℃, the temperature of expansion segment is between 200～250 ℃, the temperature of sizing section is between 300～380 ℃, and cross directional stretch speed is 12m/min～20m/min, as best preferred version of the present invention, cross directional stretch multiplying power is identical with longitudinal stretching multiplying power, and its concrete operations flow process is as follows:
On chain drive 74, be evenly equipped with the fixture 75 that can clamp sheet film, chain drive 74 comprises the conveyer chain 741 being symmetrically set in thermal-insulating body 71, be that fixture 75 is distributed on two conveyer chains 741, corresponding laterally feed mechanism 72 1 sides of thermal-insulating body 71 be provided with can closed fixture 75 close clamp mechanism 76, corresponding laterally receiving mechanism 73 1 sides of thermal-insulating body 71 be provided with can opened clamping apparatus 75 open clamp mechanism 77, sheet film after longitudinal stretching is delivered to horizontal feed mechanism 72 places, by chain drive 74, sheet film is delivered in thermal-insulating body 71, now the fixture 75 on chain drive 74 firmly clamps sheet film under the effect of closing clamp mechanism 76, and in thermal-insulating body 71, two conveyer chains 741 at preheating section place are set in parallel, sheet film preheats herein, in expansion segment, spacing between conveyer chain 741 is expanded gradually from preheating section one side to sizing section one side, when between conveyer chain 741, spacing is expanded, by fixture 75, firmly clamp sheet film, sheet film is stretched by lateral magnification herein, continuous rising due to temperature, sheet film at high temperature shrinks and gathers, for fear of film, rupture, therefore in sizing section, spacing self expandable section one side between conveyer chain 741 to horizontal receiving mechanism 73 1 sides are drawn in gradually, and sheet film completes cross directional stretch work in this stage, when sheet film is sent by the section of sizing, fixture 75 is opened under the effect of opening clamp mechanism 77, sheet film is unclamped, sheet film is by horizontal receiving mechanism 73 rollings, as preferably, between expansion segment and sizing section, be also provided with a breeze way, it should be noted that herein, in thermal-insulating body 71, be provided with and can carry out to thermal-insulating body 71 heating system of heated constant temperature, and at preheating section, expansion segment, in breeze way and sizing section, be all provided with separately heating system and control temperature sensor, and the spacing of controlling temperature sensor and sheet film is controlled at 5～7cm, and in thermal-insulating body 71, preheating section, expansion segment, breeze way and sizing section, all heat insulation by casing baffle plate between each section, be independent of each other each other, and in extremely sizing section of preheating section, temperature in thermal-insulating body 71 raises gradually, make temperature from low paramount, not only can not affect technological process, and realize the reasonable utilization of the energy, as preferred version of the present invention, transverse stretching equipment 7 is also provided with the width adjustment device 78 of spacing between two conveyer chains 741 of capable of regulating, can need to carry out the spacing adjustment between conveyer chain 741 according to practical application.
10) when stone section, sheet film after biaxial tension is placed on unreeling structure 83, as preferably, at unreeling structure 83 and reciprocal laying between mechanism 84, be also provided with cylinder 87 and suppress roll shaft 871, by cylinder 87, drive sheet film is carried by certain direction and speed, and back and forth lay mechanism 84, can move back and forth and movable roll shaft that can two-way clamping sheet film, in movable roll shaft commute motion, by the horizontal superimposion of sheet film on fixture 82, as preferably, cylinder 87 1 sides are provided with length counter 88, by length counter 88, control the length that unreels of sheet film, by compacting certain thickness, the sheet material of density sets different counting steps,
As preferably, between stone section and exhaust profiled section, be also provided with preheating section, complete after horizontal superimposion, multilayer chip film is fixed on fixture 82, then fixture 82 is delivered to preheating section, the temperature in preheating section casing is 200～250 ℃, and be 3～5 minutes preheating time;
After preheating section the pre-heat treatment, fixture 82 is moved to exhaust profiled section, temperature in exhaust profiled section casing is 350～380 ℃, time is 15～25 minutes, as preferably, at exhaust profiled section, be also provided with the hydraulic stem 89 that can promote exhaust roll shaft 85, by hydraulic stem 89, promote to be divided into the exhaust roll shaft 85 of fixture both sides Shang Xia 82, push the sheet film after superimposion simultaneously, because preheating section compares principle according to material pyrocondensation, make every layer film even up at a certain temperature homogenizing, during to exhaust profiled section, rising along with temperature, air between every layer film is expanded by heating thereupon also, making can not be fully bonding between film, can not form integral body, by exhaust roll shaft 85 direct pressings on hydraulic stem 89, to multilayer chip film, carry out exhaust, multilayer chip film after row's phosgene forms integral body, make multilayer chip film fully bonding and form whole sheet material,
As preferably, between exhaust profiled section and sizing section, be provided with cooling section, the exhaust profiled section fixture that accompanies sheet material 82 is out delivered to cooling section, sheet forming is cooled to 80～100 ℃;
Finally move to sizing section, as preferably, the oven temperature of sizing section is 80～100 ℃, pressing plate 86 is divided into the both sides of sheet material, and under the promotion of hydraulic stem 89 pressed sheet 1～2 minute, be pressed into the sheet material of certain thickness and density, after sizing, sheet material is through being cooled to normal temperature.
As best preferred version of the present invention, on the workbench 81 of superimposion equipment 8, be equipped with guide rail 811, fixture 82 is located on workbench 81 by guide rail 811 slips, and on guide rail 811, is provided with the driving chain of linkage fixture 82, realizes the conveying of fixture 82.
11) sheet material is pulled down and trimming from fixture, completed the making of expanded polytetrafluoroethylplate plate.
As another embodiment of the invention, when multilayer chip film carries out superimposion, can fill woven wire, particulate metal sheet material, glass fabric, high carbon cloth, graphite, molybdenum bisuphide, polyimides, EKONOL etc. as bed course, the mechanical performance of the expanded polytetrafluoroethylplate plate that makes is much improved, can keeps other premium properties of PTFE simultaneously.
This invents a complete set of manufacturing technique method and production equipment by our company's designed, designed, research and development installation and debugging, can produce complete and efficiently pure expanded polytetrafluoroethylplate plate at present, and the expanded polytetrafluoroethylplate plate making all reaches domestically leading standard on hot strength, elongation at break, compression ratio, rebound degree, sealing leak rate etc. indices, even catches up with and surpasses foreign standard; The expanded polytetrafluoroethylplate plate making in addition has self exclusive creep resistant and anti-cold flow characteristic, be easy to cutting, be convenient to install, the characteristic of long service life makes it in nearly all sealing occasion, obtain practical application, except few chemical substance, it can not react with other chemical substances, thereby is applicable to any chemical seal occasion, in 600 ℉ (315 ℃) all sealings below temperature, needs all can be met.
This large area, soft polyfluortetraethylene plate can or be hand-maked moulding by mechanical stamping, and any cutting method, can not exert an influence to its sealing performance, regardless of flange face shape, uses it all can make its installment work become very easy; And the plate gasket being made by it has uniqueness and complies with forming ability, thereby just can on coarse or impaired flange face, produce good sealing effectiveness without increasing how many thrusts, greatly extend the service life of flange; Final substitute as asbestos washer, tabular gasket seal is except having all advantages of polytetrafluoroethylene (PTFE), also possess self exclusive creep resistant and anti-cold flow characteristic, and these characteristics sealed product is indispensable just, be easy in addition cutting, be convenient to install, the characteristic of long service life makes it in nearly all sealing occasion, obtain practical application.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is also not only confined to above-described embodiment, and all technical schemes belonging under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a preparation method for expanded polytetrafluoroethylplate plate, is characterized in that:
1) polytetrafluoroethyldispersion dispersion resin is first refrigerated, the temperature of refrigeration is below 18 ℃, and the time of refrigeration is more than 12 hours, then sieves;
2) in the polytetrafluoroethyldispersion dispersion resin having sieved, inject a certain proportion of auxiliary agent and carry out spice; Wherein the parts by weight ratio of polytetrafluoroethyldispersion dispersion resin and auxiliary agent is: polytetrafluoroethyldispersion dispersion resin is 70～80, and auxiliary agent is 20～30;
3) mixed material through spice is carried out to maturation, maturation temperature is 45 ℃～75 ℃, and the time of maturation is 12～72 hours;
4) mixed material after maturation is pressed into tubular blank, and tubular blank is carried out to maturation, the maturation time is 5～10 hours;
5) the tubular blank after maturation is extruded into cylindrical bar;
6) cylindrical bar is rolled into sheet film;
7) by sheet film degreasing, dry, and be drawn into semi-finished product, temperature is controlled between 200 ℃～280 ℃;
8) semi-finished product sheet film is carried out to longitudinal stretching, draft temperature is controlled between 200 ℃～280 ℃;
9) sheet film after longitudinal stretching carries out cross directional stretch;
10) sheet film after multi-disc stretching carries out superimposion moulding;
11) trimming.
2. the preparation method of expanded polytetrafluoroethylplate plate according to claim 1, is characterized in that: described 4) in step, the pressing pressure of blank is 2.5～5MPa, pressurize 1～5 minute again after blank moulding;
Described 5) in step, the extrusion pressure of cylindrical bar is 5～7MPa, and its compression ratio is 100～150, and temperature is controlled at 45～75 ℃;
Described 7) in step, the draw speed of sheet film is 10～12m/min, and stretching ratio is 1.1～1.2 times.
3. the preparation method of expanded polytetrafluoroethylplate plate according to claim 1, it is characterized in that: feeding speed when described 8) semi-finished product sheet film carries out longitudinal stretching in step is 1.5～2m/min, material recovering speed is 8～16m/min, and stretching ratio is 5～8 times.
4. the preparation method of expanded polytetrafluoroethylplate plate according to claim 1, it is characterized in that: described 9) in step, cross directional stretch is divided into preheating section, expansion segment and sizing section, wherein the temperature of preheating section is between 120～150 ℃, the temperature of expansion segment is between 200～250 ℃, the temperature of sizing section is between 300～380 ℃, cross directional stretch speed is 12m/min～20m/min, and cross directional stretch multiplying power is identical with longitudinal stretching multiplying power.
5. the preparation method of expanded polytetrafluoroethylplate plate according to claim 1, is characterized in that: described 10) in step, the sheet film of multi-disc after stretching first carries out superimposion; Pass through preheating section preheating, preheat temperature is 200 ℃～250 ℃ again, and be 3～5 minutes preheating time; Then pass through exhaust section, delivery temperature is 350 ℃～380 ℃, and the time is 15～25 minutes; And then at cooling section, be cooled to 80 ℃～100 ℃; Finally move to the sizing of sizing section, temperature is 80 ℃～100 ℃, suppresses 1～2 minute.
6. a making apparatus that implements the claims the preparation method of 1 expanded polytetrafluoroethylplate plate, is characterized in that: comprise respectively automatic stirring machine, maturation case, blank machine, bar extruder, calender, degreaser drying stretcher, longitudinal stretching equipment, transverse stretching equipment, superimposion equipment and bead cutter.
7. making apparatus according to claim 6, is characterized in that: described automatic stirring machine comprises spice frame, spice bucket and gas-liquid flusher;
On described spice bucket, be symmetrically arranged with deflector roll, spice bucket is rotatably set up in spice frame by deflector roll,
Described spice frame is provided with motor, between motor and deflector roll, is connected with transmission mechanism,
Described gas-liquid flusher includes the nozzle of being located in spice bucket, the batch box being connected with nozzle, and described batch box is connected with respectively auxiliary agent holding vessel and pump,
Described nozzle is connected with described pump;
Described blank machine comprises fixed mount, is located at the barrel on fixed mount, in barrel, be formed with for the accommodating cavity volume of blank, the movable briquetting that is provided with in corresponding blank both sides in barrel, barrel two ends are respectively equipped with cylinder body, cylinder body is connected with the push rod that can promote briquetting, push rod is provided with magnet ring, and fixed mount is provided with the magnetic inductor that can coordinate with magnet ring;
Described bar extruder comprises extruder frame, be located at heat-preserving container in extruder frame, be located at the extruded tube in heat-preserving container, is provided with insulation oil in heat-preserving container,
Extruded tube corresponding ground one side is provided with taper guiding mouth and mouthful mould, and bar extruder also comprises the rotating disk that corresponding mouthful mould arranges,
The movable briquetting that is provided with of opposite side of corresponding mouthful mould in described extruded tube, the opposite side of the corresponding mouthful mould of extruded tube is provided with cylinder body, and cylinder body is connected with the push rod that can promote briquetting;
Described calender comprises support, is set up in calendering discharging device, calendering roll shaft and calendering material collecting device on support, and the corresponding calendering of calendering roll shaft discharging device position is provided with guide plate;
Described degreaser drying stretcher comprises degreasing discharge mechanism, degreasing baking oven, buffering drying section, drawing oven and degreasing receiving mechanism, degreasing discharge mechanism, degreasing baking oven, buffering drying section, drawing oven and degreasing receiving mechanism have included some roll shafts, and described degreasing baking oven is circumscribed with auxiliary agent retracting device.
8. making apparatus according to claim 6, it is characterized in that: described longitudinal stretching equipment comprises longitudinal feed mechanism, heated oven, buffering cooling body and longitudinal receiving mechanism, longitudinally feed mechanism, buffering cooling body and longitudinal receiving mechanism have included some roll shafts, described heated oven comprises casing, is located at the heating system in casing and is set up in biconial curve roller in casing, the roll shaft that described biconial curve roller comprises roller and is symmetrically set in roller both sides, described roller is ellipsoid shape.
9. making apparatus according to claim 6, it is characterized in that: described transverse stretching equipment comprises thermal-insulating body, is divided into horizontal feed mechanism and the horizontal receiving mechanism of thermal-insulating body both sides, is provided with heating system and chain drive in described thermal-insulating body;
On described chain drive, be evenly equipped with the fixture that can clamp sheet film, corresponding laterally feed mechanism one side of described thermal-insulating body is provided with the clamp mechanism that closes that can closed fixture, and corresponding laterally receiving mechanism one side of thermal-insulating body is provided with the clamp mechanism of opening that can opened clamping apparatus;
Described thermal-insulating body comprises mutually heat insulation successively preheating section, expansion segment and sizing section, and described chain drive comprises the conveyer chain being symmetrically set in thermal-insulating body,
In described preheating section, conveyer chain is set in parallel;
In described expansion segment, the spacing between conveyer chain is expanded gradually from preheating section one side to sizing section one side;
In described sizing section, spacing self expandable section one side between conveyer chain to horizontal receiving mechanism one side is drawn in gradually.
10. making apparatus according to claim 6, is characterized in that: described superimposion equipment comprises workbench, is movablely located at fixture on workbench, is located at stone section, exhaust profiled section and the sizing section on workbench respectively;
Described stone section includes unreeling structure, can continuously sheet film be laid on to the reciprocal laying mechanism on fixture;
The exhaust roll shaft that described exhaust profiled section includes casing, is located at the heater in casing and can pushes sheet film;
Described sizing section includes the pressing plate of the expanded polytetrafluoroethylplate plate of can suppressing and shape.
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| CN114147900A (en) * | 2021-12-07 | 2022-03-08 | 河南玖龙塑料科技有限公司 | PVC film production device and method |
| CN114147900B (en) * | 2021-12-07 | 2024-03-12 | 河南玖龙塑料科技有限公司 | PVC film production device and method |
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