CN103170399A - Method for preparing PTFE (polytetrafluoroethene) ultrafine powder by combining ultraviolet rays with carbon tetrachloride - Google Patents
Method for preparing PTFE (polytetrafluoroethene) ultrafine powder by combining ultraviolet rays with carbon tetrachloride Download PDFInfo
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Abstract
The invention relates to a method for preparing PTFE (polytetrafluoroethene) ultrafine powder by combining ultraviolet rays with carbon tetrachloride. The method is specifically as follows: placing dry PTFE raw material in liquid nitrogen for quenching; further crushing till the particle size is 100-1000 microns by using a crushing machine; then placing into a tray on a platform of an ultraviolet radiation box, closing the ultraviolet radiation box and opening a control mechanism of a spraying device to spray the CCl4 to the PTFE raw material in the tray, wherein the weight ratio of the sprayed CCl4 to the PTFE raw material in the tray is 3%-8%; using the ultraviolet rays to continuously radiate for 10-14 hours; exhausting waste gas after the end of radiation; taking out and placing into a gas flow crushing system, and fully crushing to get the PTFE ultrafine powder with the particle size of 0.2-5 microns. The method adopting the technical scheme is a production technology which can not only produce the PTFE ultrafine powder with high efficiency, but also effectively reduce cost.
Description
Technical field
The present invention relates to the preparation method of superfine powder of polytetrafluoroethylene, prepare the method for superfine powder of polytetrafluoroethylene in particular to the ultraviolet irradiation polytetrafluoroethylene (PTFE).
Background technology
Superfine powder of polytetrafluoroethylene requires average grain diameter less than 5 μ m, and specific surface is greater than 10m
2/ g, coefficient of friction 0.06～0.07, lubricity is good, can be dispersed in well in many materials.Can be used as anti-stick, antifriction, the flame-retardant additive of plastics, rubber, printing ink, coating, lubricant grease, also can make aerosol etc. as dry lubricant.
PTFE superfine powder product purity 100%, molecular weight is lower than below 10,000, particle diameter is in the PTFE superfine powder series of 0.5-15 μ m, not only keeping original all premium properties of polytetrafluoroethylene (PTFE), also having the performance of many uniquenesses: as without self-coagulation, without electrostatic effect, intermiscibility is good, molecular weight is low, good dispersion, self lubricity are high, coefficient of friction reduces obvious etc.
The ultra-fine superfine powder of polytetrafluoroethyl-ne can be made separately kollag and use, and also can be used as the additive of plastics, rubber, coating, printing ink, lubricating oil, lubricating grease etc.Can be with various typical powder process method during with plastics or rubber mix, as blend etc., addition is 5～20%, adds superfine powder of polytetrafluoroethylene in oil and grease, can reduce coefficient of friction, as long as add a few percent, just can improve the life-span of lubricating oil.Its dispersion in organic solvent also can be made releasing agent.
The radiation resistance of polytetrafluoroethylene (PTFE) relatively poor (1000Gy), be subjected to cause degraded after high-energy radiation, so general using electron beam, Co-60 gamma-ray irradiation polytetrafluoroethylene (PTFE) raw material, and then by fluid energy mill, irradiated polytetrafluoroethylene (PTFE) raw meal is broken into the less superfine powder of polytetrafluoroethylene of particle diameter.
But, utilize the production cost of electron beam, Co-60 gamma Rays equipment irradiation very high, and high-level security protection needs, and has further increased production cost.Therefore, the market exigence is a kind of can produce superfine powder of polytetrafluoroethylene, the production technology that can effectively reduce costs again efficiently.
Carbon tetrachloride (chemical formula: CCl
4), also claim tetrachloromethane or chlorine alkane, be a kind of colourless, volatile, nonflammable liquid, 76.8 ℃ of boiling points, vapour pressure 15.26kPa (25 ℃), vapour density 5.3g/L.Due to its stable chemical nature, degraded produces negative oxygen ion under ultraviolet irradiation, and negative oxygen ion is unstable, further produces ozone.Ozone has very strong oxidisability, easily decomposes, and the hydroxyl radical free radical that produces in decomposable process (.OH) has extremely strong oxidability, can be degraded to micromolecular compound to macromolecular compound.
Summary of the invention
The object of the invention is to, provide a kind of ultraviolet ray to prepare the method for PTFE superfine powder in conjunction with carbon tetrachloride, described method can be produced superfine powder of polytetrafluoroethylene efficiently, can obviously reduce production costs again.
Ultraviolet ray provided by the present invention prepares the method for PTFE superfine powder in conjunction with carbon tetrachloride, mainly comprise the following steps:
1) the polytetrafluoroethylene (PTFE) raw material is placed in liquid nitrogen with low temperature resistant container package dryly, takes out after chilling;
2) the polytetrafluoroethylene (PTFE) raw material after described quenching is pulverized with pulverizer, after pulverizing, particle diameter is 100-1000 μ m;
3) the polytetrafluoroethylene (PTFE) raw material after described pulverizing is put in pallet on the platform of ultraviolet irradiation case, in described pallet, the thickness of polytetrafluoroethylene (PTFE) raw material is 200mm-300mm;
4) airtight described ultraviolet irradiation case, and the controlling organization of unlatching spray equipment sprays CCl to the polytetrafluoroethylene (PTFE) raw material in described pallet
4, the CCl of described spray
4With the weight ratio of polytetrafluoroethylene (PTFE) raw material in described pallet be 3%-8%;
5) open ultraviolet ray generating apparatus, continuous irradiation 8-12 hour;
6) irradiation complete after, open the exhaust gear of above-mentioned ultraviolet irradiation case, the waste gas that produces in irradiation process is discharged;
7) open described ultraviolet irradiation case, take out above-mentioned pallet, and the polytetrafluoroethylene (PTFE) after irradiation is put into airflow comminution system, through fully pulverizing, obtain particle diameter at the superfine powder of polytetrafluoroethylene of 0.2-5 μ m.
Further, be provided with ultraviolet ray generating apparatus in the casing of described ultraviolet irradiation case, and the casing inner bottom part of ultraviolet irradiation case is a platform, described ultraviolet irradiation case one side is provided with chamber door, and be provided with at least 1 exhaust gear and at least 1 spray equipment on casing, the controlling organization of described spray equipment is positioned at outside chest.
Further, described ultraviolet ray generating apparatus comprises 4 or 5 Non-polarized lamps, and described Non-polarized lamp is 400W, and wavelength is 184.9nm or 253.7nm.
Further, described exhaust gear is air-tight state in irradiation process, is opening after irradiation finishes.
Further, described spray equipment is automatic spraying system, and described automatic spraying system is set to the CCl according to the weight ratio of the weight automatic spray setting of polytetrafluoroethylene (PTFE) raw material in pallet
4
Further, the CCl of described spray
4With the weight ratio of polytetrafluoroethylene (PTFE) raw material in described pallet be 5%.
Further, described airflow comminution system comprises airslide disintegrating mill, described airslide disintegrating mill comprises air current spray nozzle, crushing chamber, compressed air enters crushing chamber by the nozzle high velocity jet, at the joint place of multiply high pressure draught, repeatedly collided, rubbed, sheared and pulverized through irradiated described polytetrafluoroethylene (PTFE) raw material.
Further, described airflow comminution system also comprises:
Cyclone separator, deduster and air-introduced machine;
Described airslide disintegrating mill also comprises graded region, polytetrafluoroethylene (PTFE) after crushing chamber is pulverized moves to graded region under the air-introduced machine effect, under the grading wheel effect, polytetrafluoroethylgranule granule is separated by granule size, the fine grained that meets granularity requirements enters cyclone separator by grading wheel or deduster is collected, cyclone separator collect in fine grained than coarse granule, the small part ultra-fine grain is collected by deduster, the coarse granule that does not meet granularity requirements drops to crushing chamber to be continued to pulverize.
Further, the air current spray nozzle of described airslide disintegrating mill is Laval nozzle.
Further, described airslide disintegrating mill has dry filtrating equipment, before described dry filtrating equipment is positioned at nozzle.
The present invention utilizes the volatile characteristics of carbon tetrachloride, carbon tetrachloride is sprayed the surface of polytetrafluoroethylene (PTFE), the gaseous state carbon tetrachloride that forms after its volatilization forms layer of inert around polytetrafluoroethylene (PTFE) than conference due to density, make polytetrafluoroethylene (PTFE) and air insulated, the reaction of the ozone that has prevented from producing under UV-irradiation, active oxygen ion etc. and polytetrafluoroethylene (PTFE) has further improved the quality of superfine powder of polytetrafluoroethylene.
Adopt technique scheme, the present invention can produce superfine powder of polytetrafluoroethylene efficiently, the production technology that can effectively reduce costs again, simultaneously owing to utilizing the carbon tetrachloride volatilization with polytetrafluoroethylene (PTFE) raw material and air insulated, saved the step of predose sealing polytetrafluoroethylene (PTFE) raw material, further reduce production cost, improved the quality of superfine powder of polytetrafluoroethylene.
The specific embodiment
In order to make the object of the invention, technical scheme and advantage clearer, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Ultraviolet ray provided by the invention prepares the method method of PTFE superfine powder in conjunction with carbon tetrachloride, its step comprises:
1) quenching: the polytetrafluoroethylene (PTFE) raw material is placed in liquid nitrogen with low temperature resistant container package dryly, takes out after chilling;
2) the preliminary pulverizing: the polytetrafluoroethylene (PTFE) raw material after described K cryogenic treatment is pulverized (needing before pulverizing raw material is shifted out low temperature resistant container) with pulverizer, and after pulverizing, particle diameter is 100-1000 μ m;
3) the polytetrafluoroethylene (PTFE) raw material after described pulverizing is put in pallet on the platform of ultraviolet irradiation case, in described pallet, the thickness of polytetrafluoroethylene (PTFE) raw material is 200mm-300mm;
4) spray: airtight described ultraviolet irradiation case, and the controlling organization of unlatching spray equipment sprays CCl to the polytetrafluoroethylene (PTFE) raw material in described pallet
4, the CCl of described spray
4With the weight ratio of polytetrafluoroethylene (PTFE) raw material in described pallet be 3%-8%;
5) irradiation: open ultraviolet ray generating apparatus, continuous irradiation 8-12 hour;
6) exhaust: after irradiation is complete, open the exhaust gear of above-mentioned ultraviolet irradiation case, the waste gas that produces in irradiation process is discharged;
7) air-flow crushing: open described ultraviolet irradiation case, take out above-mentioned pallet, and the polytetrafluoroethylene (PTFE) after irradiation is put into airflow comminution system, can obtain particle diameter at the superfine powder of polytetrafluoroethylene of 0.2-5 μ m through abundant pulverizing.
Wherein, described ultraviolet irradiation case is preferably the chest that appearance and size is about 2000 * 10000 * 1000mm, ultraviolet ray generating apparatus is arranged on the casing inner top, the casing inner bottom part is a platform, ultraviolet irradiation case side is provided with door (can open and place and take out material), have at least 1 exhaust gear and at least 1 spray equipment at the casing top, the controlling organization of described spray equipment is positioned at the chest outside.Wherein, described ultraviolet ray generating apparatus preferably includes 4-5 400W, wavelength set is the Non-polarized lamp of 184.9nm or 253.7nm, described exhaust gear more preferably, can be air-tight state in irradiation process, be opening after irradiation finishes, described spray equipment is preferably automatic spraying system, and described automatic spraying system is set to the CCl according to the weight ratio of the weight automatic spray setting of polytetrafluoroethylene (PTFE) raw material in pallet
4, the CCl of described spray more preferably
4With the weight ratio of polytetrafluoroethylene (PTFE) raw material in described pallet be 5%.
Wherein, described airflow comminution system comprises airslide disintegrating mill, described airslide disintegrating mill comprises air current spray nozzle, crushing chamber, compressed air enters crushing chamber by the nozzle high velocity jet, at the joint place of multiply high pressure draught, repeatedly collided, rubbed, sheared and pulverized through irradiated described polytetrafluoroethylene (PTFE) raw material.
Described airflow comminution system can also comprise cyclone separator, deduster and air-introduced machine.Described airslide disintegrating mill be preferably have air current spray nozzle, crushing chamber (disintegrating area), graded region.compressed air enters crushing chamber by the nozzle high velocity jet, form the high pressure draught that multiply is intersected, joint place at the multiply high pressure draught, repeatedly collided through irradiated polytetrafluoroethylene (PTFE) raw material, friction, shear and pulverize, polytetrafluoroethylene (PTFE) after pulverizing moves to graded region with ascending air under air-introduced machine draft effect, under the powerful centrifugal action that the stage turbine of High Rotation Speed produces, according to fineness degree (particle size), polytetrafluoroethylgranule granule is separated, the fine grained that meets granularity requirements (less than 5 μ m) enters cyclone separator or deduster collection by grading wheel, cyclone separator collect in fine grained than coarse granule, the small part ultra-fine grain is collected by deduster, coarse granule drops to crushing chamber to be continued to pulverize.The air current spray nozzle of described airslide disintegrating mill is preferably Laval nozzle, and is better for guaranteeing crushing effect, can also be before nozzle placement filter drying device (further reducing to treat the humidity of pulverized particles).
Embodiment one
A kind of ultraviolet ray prepares the method method of PTFE superfine powder in conjunction with carbon tetrachloride, comprise the following steps:
1) quenching: the polytetrafluoroethylene (PTFE) raw material is placed in liquid nitrogen with low temperature resistant container package dryly, takes out after chilling, makes the polytetrafluoroethylene (PTFE) raw material be easier to pulverize;
2) the preliminary pulverizing: the polytetrafluoroethylene (PTFE) raw material after described K cryogenic treatment is pulverized with pulverizer, and powder particle diameter is 100-1000 μ m;
3) the polytetrafluoroethylene (PTFE) raw material after described pulverizing is put in pallet on the platform of ultraviolet irradiation case, in described pallet, the thickness of polytetrafluoroethylene (PTFE) raw material is 200mm-300mm;
4) airtight described ultraviolet irradiation case, and the controlling organization of unlatching spray equipment sprays CCl to the polytetrafluoroethylene (PTFE) raw material in described pallet
4, the CCl of described spray
4With the weight ratio of polytetrafluoroethylene (PTFE) raw material in described pallet be 3%;
5) ultraviolet irradiation: open 5 ultraviolet Excimer lamps (preferred 400W, and the wavelength of ultraviolet Excimer lamp is 184.9nm or 253.7nm) at chest top, continuous irradiation 8 hours;
6) exhaust: after irradiation is complete, open the exhaust gear of above-mentioned ultraviolet irradiation case, the waste gas that produces in irradiation process is discharged;
7) air-flow crushing: open described ultraviolet irradiation case, take out above-mentioned pallet, and the polytetrafluoroethylene (PTFE) after irradiation is put into airflow comminution system, can obtain particle diameter at the superfine powder of polytetrafluoroethylene of 0.2-5 μ m through abundant pulverizing.
Embodiment two
A kind of ultraviolet ray prepares the method method of PTFE superfine powder in conjunction with carbon tetrachloride, comprise the following steps:
1) quenching: the polytetrafluoroethylene (PTFE) raw material is placed in liquid nitrogen with low temperature resistant container package dryly, takes out after chilling, makes the polytetrafluoroethylene (PTFE) raw material be easier to pulverize;
2) the preliminary pulverizing: the polytetrafluoroethylene (PTFE) raw material after described K cryogenic treatment is pulverized with pulverizer, and powder particle diameter is 100-1000 μ m;
3) the polytetrafluoroethylene (PTFE) raw material after described pulverizing is put in pallet on the platform of ultraviolet irradiation case, in described pallet, the thickness of polytetrafluoroethylene (PTFE) raw material is 200mm-300mm;
4) airtight described ultraviolet irradiation case, and the controlling organization of unlatching spray equipment sprays CCl to the polytetrafluoroethylene (PTFE) raw material in described pallet
4, the CCl of described spray
4With the weight ratio of polytetrafluoroethylene (PTFE) raw material in described pallet be 8%;
5) ultraviolet irradiation: open 4 low pressure mercury lamps being arranged on the chest wall (preferred 400W, and wavelength is 253.7nm), continuous irradiation 10 hours;
6) exhaust: after irradiation is complete, open the exhaust gear of above-mentioned ultraviolet irradiation case, the waste gas that produces in irradiation process is discharged;
7) air-flow crushing: open described ultraviolet irradiation case, take out above-mentioned pallet, and the polytetrafluoroethylene (PTFE) after irradiation is put into airflow comminution system, can obtain particle diameter at the superfine powder of polytetrafluoroethylene of 0.2-5 μ m through abundant pulverizing.
Above-mentioned crushing process comprises air-flow crushing and finished product collection, and air-flow crushing is specially airflow comminution system and is comprised airslide disintegrating mill, cyclone separator, deduster and air-introduced machine by realizations such as airslide disintegrating mill and air-introduced machines.
described airslide disintegrating mill has air current spray nozzle, crushing chamber, graded region, compressed air arrives crushing chamber by the nozzle high velocity jet, joint place at the multiply high pressure draught is collided repeatedly through irradiated described polytetrafluoroethylene (PTFE) raw material, friction, shear and pulverize, polytetrafluoroethylene (PTFE) after pulverizing moves to graded region with ascending air under air-introduced machine draft effect, under the powerful centrifugal action that the stage turbine of High Rotation Speed produces, the thickness polytetrafluoroethylgranule granule is separated, the fine grained that meets granularity requirements enters cyclone separator or deduster collection, cyclone separator collect in fine grained than coarse granule, the small part ultra-fine grain is collected by deduster, coarse granule drops to disintegrating area to be continued to pulverize.
Embodiment three
A kind of ultraviolet ray prepares the method for PTFE superfine powder in conjunction with carbon tetrachloride, comprise the following steps:
1) quenching: the polytetrafluoroethylene (PTFE) raw material is placed in liquid nitrogen with low temperature resistant container package dryly, takes out after chilling, makes the polytetrafluoroethylene (PTFE) raw material be easier to pulverize;
2) the preliminary pulverizing: the polytetrafluoroethylene (PTFE) raw material after described K cryogenic treatment is pulverized with pulverizer, and powder particle diameter is 100-1000 μ m;
3) the polytetrafluoroethylene (PTFE) raw material after described pulverizing is put in pallet on the platform of ultraviolet irradiation case, in described pallet, the thickness of polytetrafluoroethylene (PTFE) raw material is 200mm-300mm;
4) airtight described ultraviolet irradiation case, and the controlling organization of unlatching spray equipment sprays CCl to the polytetrafluoroethylene (PTFE) raw material in described pallet
4, the CCl of described spray
4With the weight ratio of polytetrafluoroethylene (PTFE) raw material in described pallet be 5%;
5) ultraviolet irradiation: airtight described ultraviolet irradiation case, and open 4 intensive ultraviolet high-pressure mercury-vapor lamps that lay respectively at the 300W of chest top and wall, continuous irradiation 12 hours;
6) exhaust: after irradiation is complete, open the exhaust gear of above-mentioned ultraviolet irradiation case, the waste gas that produces in irradiation process is discharged;
7) air-flow crushing: open described ultraviolet irradiation case, take out above-mentioned pallet, and the polytetrafluoroethylene (PTFE) after irradiation is put into airflow comminution system, can obtain particle diameter at the superfine powder of polytetrafluoroethylene of 0.2-5 μ m through abundant pulverizing.
The said flow crushing system comprises airslide disintegrating mill, cyclone separator, deduster and air-introduced machine.
described airslide disintegrating mill has air current spray nozzle, crushing chamber, graded region, compressed air arrives crushing chamber by the nozzle high velocity jet, joint place at the multiply high pressure draught is collided repeatedly through irradiated described polytetrafluoroethylene (PTFE) raw material, friction, shear and pulverize, polytetrafluoroethylene (PTFE) after pulverizing moves to graded region with ascending air under air-introduced machine draft effect, under the powerful centrifugal action that the stage turbine of High Rotation Speed produces, the thickness polytetrafluoroethylgranule granule is separated, the fine grained that meets granularity requirements enters cyclone separator or deduster collection, cyclone separator collect in fine grained than coarse granule, the small part ultra-fine grain is collected by deduster, coarse granule drops to disintegrating area to be continued to pulverize.
Embodiment four
A kind of ultraviolet ray prepares the method for PTFE superfine powder in conjunction with carbon tetrachloride, comprise the following steps:
1) quenching: the polytetrafluoroethylene (PTFE) raw material is placed in liquid nitrogen with low temperature resistant container package dryly, takes out after chilling, makes the polytetrafluoroethylene (PTFE) raw material be easier to pulverize;
2) the preliminary pulverizing: the polytetrafluoroethylene (PTFE) raw material after described K cryogenic treatment is pulverized with pulverizer, and powder particle diameter is 100-1000 μ m;
3) the polytetrafluoroethylene (PTFE) raw material after described pulverizing is put in pallet on the platform of ultraviolet irradiation case, in described pallet, the thickness of polytetrafluoroethylene (PTFE) raw material is 200mm-300mm;
4) airtight described ultraviolet irradiation case, and the controlling organization of unlatching spray equipment sprays CCl to the polytetrafluoroethylene (PTFE) raw material in described pallet
4, the CCl of described spray
4With the weight ratio of polytetrafluoroethylene (PTFE) raw material in described pallet be 5%;
5) ultraviolet irradiation: airtight described ultraviolet irradiation case, and the 400W wavelength set of opening 5 chest tops is the Non-polarized lamp of 184.9nm, continuous irradiation 12 hours;
6) exhaust: after irradiation is complete, open the exhaust gear of above-mentioned ultraviolet irradiation case, the waste gas that produces in irradiation process is discharged;
7) air-flow crushing: open described ultraviolet irradiation case, take out above-mentioned pallet, and the polytetrafluoroethylene (PTFE) after irradiation is put into airflow comminution system, can obtain particle diameter at the superfine powder of polytetrafluoroethylene of 0.2-5 μ m through abundant pulverizing.
The said flow crushing system comprises airslide disintegrating mill, cyclone separator, deduster and air-introduced machine.
described airslide disintegrating mill has Laval nozzle, crushing chamber, graded region, compressed air enters crushing chamber by the nozzle high velocity jet, joint place at the multiply high pressure draught is collided repeatedly through irradiated described polytetrafluoroethylene (PTFE) raw material, friction, shear and pulverize, polytetrafluoroethylene (PTFE) after pulverizing moves to graded region with ascending air under air-introduced machine draft effect, under the powerful centrifugal action that the stage turbine of High Rotation Speed produces, the thickness polytetrafluoroethylgranule granule is separated, the fine grained that meets granularity requirements enters cyclone separator or deduster collection, cyclone separator collect in fine grained than coarse granule, the small part ultra-fine grain is collected by deduster, coarse granule drops to disintegrating area to be continued to pulverize.
Adopt Non-polarized lamp because electrodeless startup is fast in the present embodiment, and the pressure drop loss can avoid starting the time, service life is longer, can reach the service life of 5-6, makes the cost of this method lower.
Embodiment five
A kind of ultraviolet ray prepares the method for PTFE superfine powder in conjunction with carbon tetrachloride, comprise the following steps:
1) quenching: the polytetrafluoroethylene (PTFE) raw material is placed in liquid nitrogen with low temperature resistant container package dryly, takes out after chilling, makes the polytetrafluoroethylene (PTFE) raw material be easier to pulverize;
2) the preliminary pulverizing: the polytetrafluoroethylene (PTFE) raw material after described K cryogenic treatment is pulverized with pulverizer, and powder particle diameter is 100-1000 μ m;
3) the polytetrafluoroethylene (PTFE) raw material after described pulverizing is put in pallet on the platform of ultraviolet irradiation case, in described pallet, the thickness of polytetrafluoroethylene (PTFE) raw material is 200mm-300mm;
4) airtight described ultraviolet irradiation case, and the controlling organization of unlatching spray equipment sprays CCl to the polytetrafluoroethylene (PTFE) raw material in described pallet
4, the CCl of described spray
4With the weight ratio of polytetrafluoroethylene (PTFE) raw material in described pallet be 3%;
5) ultraviolet irradiation: airtight described ultraviolet irradiation case, and open 4 Non-polarized lamps that the 400W wavelength set is 253.7nm at chest top, continuous irradiation 10 hours;
6) exhaust: after irradiation is complete, open the exhaust gear of above-mentioned ultraviolet irradiation case, the waste gas that produces in irradiation process is discharged;
7) air-flow crushing: open described ultraviolet irradiation case, take out above-mentioned pallet, and the polytetrafluoroethylene (PTFE) after irradiation is put into airflow comminution system, can obtain particle diameter at the superfine powder of polytetrafluoroethylene of 0.2-5 μ m through abundant pulverizing.
The said flow crushing system comprises airslide disintegrating mill, cyclone separator, deduster and air-introduced machine.
described airslide disintegrating mill has air current spray nozzle, crushing chamber, graded region, the filtration drying device of compressed air before by nozzle enters nozzle, then high velocity jet enters crushing chamber, joint place at the multiply high pressure draught is collided repeatedly through irradiated described polytetrafluoroethylene (PTFE) raw material, friction, shear and pulverize, polytetrafluoroethylene (PTFE) after pulverizing moves to graded region with ascending air under air-introduced machine draft effect, under the powerful centrifugal action that the stage turbine of High Rotation Speed produces, the thickness polytetrafluoroethylgranule granule is separated, the fine grained that meets granularity requirements enters cyclone separator or deduster collection, cyclone separator collect in fine grained than coarse granule, the small part ultra-fine grain is collected by deduster, coarse granule drops to disintegrating area to be continued to pulverize.
The above is only preferred embodiment of the present invention, is not to limit practical range of the present invention; If do not break away from the spirit and scope of the present invention, the present invention is modified or is equal to replacement, all should be encompassed in the middle of the protection domain of claim of the present invention.
Claims (10)
1. a ultraviolet ray prepares the method for PTFE superfine powder in conjunction with carbon tetrachloride, it is characterized in that, comprises following steps:
1) the polytetrafluoroethylene (PTFE) raw material is placed in liquid nitrogen with low temperature resistant container package dryly, takes out after chilling;
2) the polytetrafluoroethylene (PTFE) raw material after described quenching is pulverized with pulverizer, after pulverizing, particle diameter is 100-1000 μ m;
3) the polytetrafluoroethylene (PTFE) raw material after described pulverizing is put in pallet on the platform of ultraviolet irradiation case, in described pallet, the thickness of polytetrafluoroethylene (PTFE) raw material is 200mm-300mm;
4) airtight described ultraviolet irradiation case, and the controlling organization of unlatching spray equipment sprays CCl to the polytetrafluoroethylene (PTFE) raw material in described pallet
4, the CCl of described spray
4With the weight ratio of polytetrafluoroethylene (PTFE) raw material in described pallet be 3%-8%;
5) open ultraviolet ray generating apparatus, continuous irradiation 8-12 hour;
6) irradiation complete after, open the exhaust gear of above-mentioned ultraviolet irradiation case, the waste gas that produces in irradiation process is discharged;
7) open described ultraviolet irradiation case, take out above-mentioned pallet, and the polytetrafluoroethylene (PTFE) after irradiation is put into airflow comminution system, through fully pulverizing, obtain particle diameter at the superfine powder of polytetrafluoroethylene of 0.2-5 μ m.
2. the method for claim 1, it is characterized in that, be provided with ultraviolet ray generating apparatus in the casing of described ultraviolet irradiation case, and the casing inner bottom part of ultraviolet irradiation case is a platform, described ultraviolet irradiation case one side is provided with chamber door, and be provided with at least 1 exhaust gear and at least 1 spray equipment on casing, the controlling organization of described spray equipment is positioned at outside chest.
3. method as claimed in claim 2, is characterized in that, described ultraviolet ray generating apparatus comprises 4 or 5 Non-polarized lamps, and described Non-polarized lamp is 400W, and wavelength is 184.9nm or 253.7nm.
4. method as claimed in claim 2, is characterized in that, described exhaust gear is air-tight state in irradiation process, is opening after irradiation finishes.
5. the method for claim 1, is characterized in that, described spray equipment is automatic spraying system, and described automatic spraying system is set to the CCl according to the weight ratio of the weight automatic spray setting of polytetrafluoroethylene (PTFE) raw material in pallet
4
6. method as claimed in claim 5, is characterized in that, the CCl of described spray
4With the weight ratio of polytetrafluoroethylene (PTFE) raw material in described pallet be 5%.
7. the method for claim 1, it is characterized in that, described airflow comminution system comprises airslide disintegrating mill, described airslide disintegrating mill comprises air current spray nozzle, crushing chamber, compressed air enters crushing chamber by the nozzle high velocity jet, at the joint place of multiply high pressure draught, repeatedly collided, rubbed, sheared and pulverized through irradiated described polytetrafluoroethylene (PTFE) raw material.
8. method as claimed in claim 7, is characterized in that, described airflow comminution system also comprises:
Cyclone separator, deduster and air-introduced machine;
Described airslide disintegrating mill also comprises graded region, polytetrafluoroethylene (PTFE) after crushing chamber is pulverized moves to graded region under the air-introduced machine effect, under the grading wheel effect, polytetrafluoroethylgranule granule is separated by granule size, the fine grained that meets granularity requirements enters cyclone separator by grading wheel or deduster is collected, and the coarse granule that does not meet granularity requirements drops to crushing chamber to be continued to pulverize.
9. method as claimed in claim 8, is characterized in that, the air current spray nozzle of described airslide disintegrating mill is Laval nozzle.
10. as the described method of arbitrary claim in claim 1-9, it is characterized in that, described airslide disintegrating mill has dry filtrating equipment, before described dry filtrating equipment is positioned at nozzle.
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