CN103183834A - Method for preparing PTFE (polytetrafluoroethylene) ultrafine powder by combining gamma rays, hydrogen peroxide and carbon tetrachloride - Google Patents
Method for preparing PTFE (polytetrafluoroethylene) ultrafine powder by combining gamma rays, hydrogen peroxide and carbon tetrachloride Download PDFInfo
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Abstract
The invention discloses a method for preparing PTFE ultrafine powder by combining gamma rays, hydrogen peroxide and carbon tetrachloride. The method comprises the following steps as follows: a dried PTFE raw material is placed in liquid nitrogen to be quenched; then the raw material is ground into PTFE powder with the grain size of 100-1000 mu m by a grinder; then the powder is placed in a container of an automatic assembly line of a cobalt-60 device; hydrogen peroxide and carbon tetrachloride are sprayed on the automatic assembly line firstly, then the powder is irradiated when passing through the cobalt-60 device, the irradiation dose is 40-60 KGy, and the irradiation time depends on the radioactivity of the cobalt-60 device; the automatic assembly line conveys the radiated PTFE powder outside an irradiation room; and the powder is placed into an airflow grinding system to be ground fully, so that the PTFE ultrafine powder with the grain size of 0.2-5 mu m can be obtained. According to the method, the degradation rate of the PTFE can be increased, and simultaneously the automatic assembly line is adopted, so that the production efficiency is improved further.
Description
Technical field
The present invention relates to chemical technology field, particularly a kind of gamma-rays prepares the method for PTFE ultrafine powder in conjunction with hydrogen peroxide and tetracol phenixin.
Background technology
Polytetrafluoroethylene (PTFE) is commonly called as the plastics king, is the polymkeric substance that is polymerized by tetrafluoroethylene monomer, and very strong coherency is arranged, and is easy to be attached to together, is difficult for disperseing.PTFE ultrafine powder (micro mist) is low-molecular-weight tetrafluoroethylene, molecular weight is below 10,000, particle diameter is between 0.5-15 μ m, the PTFE ultrafine powder is not only keeping original all premium propertiess of tetrafluoroethylene, also have many particular performances: as no self coagulation, no electrostatic effect, intermiscibility is good, molecular weight is low, good dispersity, self lubricity height, frictional coefficient reduce, not conglomeration mixes mutually with oil or organic liquid easily, also can evenly mix etc. with other solia particle.PTFE ultrafine powder median size is less than 5 μ m, and specific surface is greater than 10m
2/ g, frictional coefficient 0.06～0.07, oilness 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, lubricating grease, also can make aerosol etc. as dry lubricant.The PTFE ultrafine powder can be made solid lubricant separately and use, and also can be used as the additive of plastics, rubber, coating, printing ink, lubricating oil, lubricating grease etc.Can adopt various typical powder process method and plastics or rubber mix, as blend etc.In oil and grease, add the PTFE ultrafine powder, can reduce frictional coefficient, as long as add percentum, the life-span that can improve lubricating oil.Its dispersion in organic solvent also can be made releasing agent.
Tetracol phenixin (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.Tetracol phenixin is degraded to negative oxygen ion under effect of irradiation, negative oxygen ion instability, ozonize, ozone is strong oxidizer, easily decompose, the hydroxyl radical free radical that produces in decomposition course (.OH) has extremely strong oxidation capacity, can be degraded to micromolecular compound to macromolecular compound.
Hydrogen peroxide is commonly called as hydrogen peroxide, and molecular formula H2O2 is the oxide compound of the another kind of hydrogen outside dewatering.Viscosity ratio water is high a little, and unstable chemcial property is generally deposited with 30% or 60% aqueous solution form.Hydrogen peroxide has very strong oxidisability, and the tool slightly acidic.
The method for preparing the PTFE ultrafine powder has determined structure properties, molecular weight and the distribution thereof of PTFE ultrafine powder.The preparation method of PTFE ultrafine powder mainly contains two kinds: 1, directly regulate polymerization with tetrafluoroethylene, stop polyreaction behind certain hour, product is suitably processed again; 2, with high molecular PTFE cracking, pulverize again.The method that scission reaction prepares the PTFE ultrafine powder mainly contains thermo-cracking and irradiation to crack.In the irradiation to crack process, the cracking of PTFE is subjected to the influence of radiation parameter, the energy derive that irradiation dose, irradiation adopt and the difference of oxidizing condition, therefore physicals and chemical property to the PTFE ultrafine powder all have considerable influence, need to the equipment in the PTFE irradiation to crack process and processing condition are optimized and strict control.
Summary of the invention
At above-mentioned problems of the prior art, the object of the present invention is to provide a kind of gamma-rays to prepare the method for PTFE ultrafine powder in conjunction with hydrogen peroxide and tetracol phenixin.
In order to realize the foregoing invention purpose, the technical solution used in the present invention is as follows:
A kind of gamma-rays prepares the method for PTFE ultrafine powder in conjunction with hydrogen peroxide and tetracol phenixin, comprises the steps:
(1) the tetrafluoroethylene raw material with drying carries out the chilling processing with liquid nitrogen; It is the powder of 100-1000 μ m that tetrafluoroethylene raw material pulverizing after the chilling processing is become particle diameter;
(2) the tetrafluoroethylene powder is put into container, described container seals and is positioned on the automatic production line that runs through cobalt 60 radiation chambers, be provided with at least 1 spray equipment interface in it, cobalt 60 radiation chambers comprise automatic production line, at least 1 tetracol phenixin spray equipment and at least 1 hydrogen peroxide spray equipment, radiation divider wall and the watch-keeping cubicle that is positioned at middle at least 1 cobalt 60 irradiator of radiation chamber, process cobalt 60 irradiator;
(3) the tetrafluoroethylene powder is along with the automatic production line of opening at the uniform velocity enters radiation chamber, at the tetrafluoroethylene powder during through at least 1 cobalt 60 irradiator, described at least 1 tetracol phenixin spray equipment is to tetrafluoroethylene powder spray tetracol phenixin, at least 1 hydrogen peroxide spray equipment is to tetrafluoroethylene powder spray hydrogen peroxide, the hydrogen peroxide of spray and the weight ratio of described tetrafluoroethylene powder are 3%-8%, and the weight ratio of the tetracol phenixin of spray and tetrafluoroethylene powder is 3%-8%;
(4) through described at least 1 cobalt 60 irradiator the time, the gamma ray that at least 1 cobalt 60 irradiator produce carries out irradiation to the tetrafluoroethylene powder, and irradiation dose is 40-60KGy;
(5) container that is equipped with through the tetrafluoroethylene powder of irradiation transports radiation chamber by automatic production line;
(6) with micronizer mill will pulverize again through the tetrafluoroethylene powder of irradiation, classification, fine polytetrafluoroethylpowder powder is dispersed into the following superfine powder of polytetrafluoroethylene of median size 5 μ m.
Further, described at least 1 hydrogen peroxide spray equipment and at least 1 tetracol phenixin spray equipment are respectively to tetrafluoroethylene powder spray hydrogen peroxide and tetracol phenixin, the hydrogen peroxide of spray and the weight ratio of tetrafluoroethylene powder are 5%, and the weight ratio of the tetracol phenixin of spray and tetrafluoroethylene powder is 5%.
Further, described at least 1 cobalt 60 irradiator are single screen cobalt source.
Further, described at least 1 cobalt 60 irradiator are double grid plate cobalt source.
Further, step (4) comprises that also described automatic production line and the container that the tetrafluoroethylene powder is housed are bonded together, and will pour the opening for feed of the described micronizer mill of step (5) through the tetrafluoroethylene powder of irradiation at the exit end of automatic production line.
Further, described micronizer mill comprises airflow nozzle, crushing chamber, and pressurized air is gone into crushing chamber by the nozzle high-velocity jet, makes the fine polytetrafluoroethylpowder powder particle through irradiation collide repeatedly, rub, shear and pulverize at the joint place of multiply high pressure draft.
Further, described micronizer mill also comprises cyclonic separator, fly-ash separator and induced draft fan; Described micronizer mill comprises graded region, tetrafluoroethylene after crushing chamber is pulverized moves to graded region under the induced draft fan effect, under the grading wheel effect, the fine polytetrafluoroethylpowder powder particle is separated by globule size, the fine particle that meets granularity requirements enters cyclonic separator by grading wheel or fly-ash separator is collected, cyclonic separator collect in the fine particle than coarse particle, the small part ultrafine particle is collected by fly-ash separator, the coarse particles that does not meet granularity requirements drops to crushing chamber to be continued to pulverize.
Further, the airflow nozzle of described micronizer mill is laval nozzle.
Further, described micronizer mill has the dry filter device, before the dry filter device is positioned at nozzle.
Further, described automatic production line is for realizing auto reversive bucket conveyor or hanging chain conveyor system.
Preparation method according to superfine powder of polytetrafluoroethylene provided by the invention, under identical radiation parameter, can increase the degradation rate of tetrafluoroethylene, perhaps under the situation that reduces irradiation time, also can reach identical degradation rate, can enhance productivity significantly, save production cost, take into account quality product simultaneously, the low molecular weight polytetrafluoroethylene median size that guarantees to obtain is less than 5 μ m, and the whole manufacturing process strictness is controlled.
Embodiment
In order to make purpose of the present 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 explaining the present invention, and be not used in restriction the present invention.
The radiation resistance of tetrafluoroethylene relatively poor (1000Gy), be subjected to cause degraded behind the high-energy radiation, the present invention utilizes this characteristic of tetrafluoroethylene to adopt cobalt 60 devices that tetrafluoroethylene is carried out radiation degradation and handles, and carries out dispersion treatment with micronizer mill again and can obtain the superfine powder of polytetrafluoroethylene material.
Cobalt-60(Co) is one of radio isotope of metallic element cobalt, and its transformation period is 5.27.It can see through the β decay and emit energy and become nickel-60 up to the high-velocity electrons of 315keV, can emit two bundle gamma rays simultaneously, and its energy is respectively 1.17 and 1.33MeV.Gamma-rays claims the γ particle flux again, is the hertzian wave that wavelength is shorter than 0.2 dust, and very strong penetration power is arranged.
Through behind the irradiation-induced degradation, tetrafluoroethylene becomes low molecule by polymer, but low molecular tetrafluoroethylene still reunites together, is not dispersed into micromolecular ultrafine powder.In order to obtain ultrafine powder, must be the low molecular tetrafluoroethylene behind the irradiation-induced degradation through comminution by gas stream and pulverizing.
Employed micronizer mill comprises airflow nozzle, crushing chamber among the following embodiment of the present invention, pressurized air is gone into crushing chamber by the nozzle high-velocity jet, at the joint place of multiply high pressure draft, collided repeatedly, rubbed, sheared and pulverized through irradiated fine polytetrafluoroethylpowder powder particle.Wherein, the airflow nozzle of micronizer mill is laval nozzle, and its place ahead is provided with the dry filter device.Micronizer mill also comprises cyclonic separator, fly-ash separator and induced draft fan.Micronizer mill also comprises graded region, tetrafluoroethylene after crushing chamber is pulverized moves to graded region under the induced draft fan effect, under the centrifugal action that the stage turbine of high speed rotating produces, polytetrafluoroethylene granule is pressed globule size and is separated, the fine particle that meets granularity requirements enters cyclonic separator by grading wheel or fly-ash separator is collected, cyclonic separator collect in the fine particle than coarse particle, the small part ultrafine particle is collected by fly-ash separator, and the coarse particles that does not meet granularity requirements drops to crushing chamber to be continued to pulverize.
Embodiment one
A kind of preparation method of superfine powder of polytetrafluoroethylene comprises the steps:
(1) the tetrafluoroethylene raw material with drying carries out the low temperature deepfreeze with liquid nitrogen; It is the powder of 100-1000 μ m that tetrafluoroethylene raw material pulverizing after the subzero treatment is become particle diameter;
(2) the tetrafluoroethylene powder is put into container, container is the goods bucket that is positioned on the bucket conveyor that runs through cobalt 60 radiation chambers, cobalt 60 radiation chambers comprise 1 the single screen cobalt source that is positioned at the radiation chamber centre, bucket conveyor through single screen cobalt source, be positioned on the automatic production line and 1 hydrogen peroxide spray equipment and 1 tetracol phenixin spray equipment of contiguous described cobalt 60 irradiator, radiation divider wall and watch-keeping cubicle;
(3) the tetrafluoroethylene powder is along with the bucket conveyor of opening at the uniform velocity enters radiation chamber, hydrogen peroxide spray equipment and tetracol phenixin spray equipment spray hydrogen peroxide and tetracol phenixin to it when tetrafluoroethylene powder process, the hydrogen peroxide of spray and the weight ratio of tetrafluoroethylene powder are 3%, and the weight ratio of the tetracol phenixin of spray and tetrafluoroethylene powder is 8%;
(4) through single screen cobalt source the time, the gamma ray that single screen cobalt source produces carries out irradiation to the tetrafluoroethylene powder, and irradiation dose is 40KGy, and the speed of bucket conveyor is determined by the radioactivity size in single screen cobalt source, and controlled by the watch-keeping cubicle;
(5) the goods bucket that is equipped with through the tetrafluoroethylene powder of irradiation transports radiation chamber by bucket conveyor, and will be discharged at comminution by gas stream raw material district through the tetrafluoroethylene powder of irradiation;
(6) with micronizer mill to the fine polytetrafluoroethylpowder powder through irradiation pulverize again, classification, fine polytetrafluoroethylpowder powder is dispersed into the superfine powder of polytetrafluoroethylene of median size below 5 μ m.
Embodiment two:
A kind of preparation method of superfine powder of polytetrafluoroethylene comprises the steps:
(1) step (1) is identical with embodiment one;
(2) the tetrafluoroethylene powder is put into container, container is the goods bucket that is positioned on the bucket conveyor that runs through cobalt 60 radiation chambers, cobalt 60 radiation chambers comprise 2 single screen cobalt sources that are positioned at the radiation chamber centre, bucket conveyor through single screen cobalt source, be positioned on the automatic production line and 1 hydrogen peroxide spray equipment and 2 tetracol phenixin spray equipments of contiguous cobalt 60 irradiator, radiation divider wall and watch-keeping cubicle;
(3) the tetrafluoroethylene powder is along with the bucket conveyor of opening at the uniform velocity enters radiation chamber, hydrogen peroxide spray equipment and tetracol phenixin spray equipment spray hydrogen peroxide and tetracol phenixin to it when tetrafluoroethylene powder process, the hydrogen peroxide of spray and the weight ratio of tetrafluoroethylene powder are 3%, and the weight ratio of the tetracol phenixin of spray and tetrafluoroethylene powder is 8%;
(4) after spray hydrogen peroxide and tetracol phenixin, the tetrafluoroethylene powder continues to continue with bucket conveyor mobile, through single screen cobalt source the time, the gamma ray that single screen cobalt source produces carries out irradiation to the tetrafluoroethylene powder, irradiation dose is 60KGy, the speed of bucket conveyor is determined by the radioactivity size in single screen cobalt source, and is controlled by the watch-keeping cubicle;
Step (5) to (6) is identical with embodiment one.
Embodiment three:
A kind of preparation method of superfine powder of polytetrafluoroethylene comprises the steps:
(1) step (1) is identical with embodiment one;
(2) the tetrafluoroethylene powder is put into container, container is the goods bucket that is positioned on the suspension chain conveyor system that runs through cobalt 60 radiation chambers, cobalt 60 radiation chambers comprise 1 the double grid plate cobalt source that is positioned at the radiation chamber centre, suspension chain conveyor system through double grid plate cobalt source, be positioned at 2 hydrogen peroxide spray equipments and 1 tetracol phenixin spray equipment of hanging chain conveyor system and contiguous double grid plate cobalt source, radiation divider wall and watch-keeping cubicle;
(3) the tetrafluoroethylene powder is along with the suspension chain conveyor system of opening at the uniform velocity enters radiation chamber, 2 hydrogen peroxide spray equipments and 1 tetracol phenixin spray equipment spray hydrogen peroxide and tetracol phenixin to it when tetrafluoroethylene powder process, the hydrogen peroxide of spray and the weight ratio of tetrafluoroethylene powder are 8%, and the weight ratio of the tetracol phenixin of spray and tetrafluoroethylene powder is 3%;
(4) the tetrafluoroethylene powder continues mobile with hanging chain conveyor system, through double grid plate cobalt source the time, the gamma ray that double grid plate cobalt source produces carries out irradiation to the tetrafluoroethylene powder, irradiation dose is 50KGy, hang the speed of chain conveyor system by the radioactivity size decision in double grid plate cobalt source, and controlled by the watch-keeping cubicle;
Step (5) to (6) is identical with embodiment one.
Embodiment four:
A kind of preparation method of superfine powder of polytetrafluoroethylene comprises the steps:
(1) step (1) is identical with embodiment one;
(2) the tetrafluoroethylene powder is put into container, container is the goods bucket that is positioned on the suspension chain conveyor system that runs through cobalt 60 radiation chambers, cobalt 60 radiation chambers comprise 3 single screen cobalt sources that are positioned at the radiation chamber centre, suspension chain conveyor system through single screen cobalt source, be positioned at 2 hydrogen peroxide spray equipments and 2 tetracol phenixin spray equipments of hanging chain conveyor system top and contiguous single screen cobalt source, radiation divider wall and watch-keeping cubicle;
(3) the tetrafluoroethylene powder is along with the suspension chain conveyor system of opening at the uniform velocity enters radiation chamber, 2 hydrogen peroxide spray equipments and 2 tetracol phenixin spray equipments spray hydrogen peroxide and tetracol phenixin to it when tetrafluoroethylene powder process, the hydrogen peroxide of spray and the weight ratio of tetrafluoroethylene powder are 8%, and the weight ratio of the tetracol phenixin of spray and tetrafluoroethylene powder is 5%;
(4) the tetrafluoroethylene powder continues mobile along with hanging chain conveyor system, through single screen cobalt source the time, the gamma ray that single screen cobalt source produces carries out irradiation to the tetrafluoroethylene powder, irradiation dose is 60KGy, hang the speed of chain conveyor system by the radioactivity size decision in single screen cobalt source, and controlled by the watch-keeping cubicle;
Step (5) to (6) is identical with embodiment one.
Embodiment five:
A kind of preparation method of superfine powder of polytetrafluoroethylene comprises the steps:
(1) step (1) is identical with embodiment one;
(2) the tetrafluoroethylene powder is put into container, container is the goods bucket that is positioned on the suspension chain conveyor system that runs through cobalt 60 radiation chambers, cobalt 60 radiation chambers comprise 2 double grid plate cobalt sources that are positioned at the radiation chamber centre, suspension chain conveyor system through double grid plate cobalt source, be positioned at 2 hydrogen peroxide spray equipments and 3 tetracol phenixin spray equipments in automatic production line and contiguous double grid plate cobalt source, radiation divider wall and watch-keeping cubicle;
(3) the tetrafluoroethylene powder is along with the suspension chain conveyor system of opening at the uniform velocity enters radiation chamber, 2 hydrogen peroxide spray equipments and 3 tetracol phenixin spray equipments spray hydrogen peroxide and tetracol phenixin to it when tetrafluoroethylene powder process, the hydrogen peroxide of spray and the weight ratio of tetrafluoroethylene powder are 5%, and the weight ratio of the tetracol phenixin of spray and tetrafluoroethylene powder is 8%;
(4) the tetrafluoroethylene powder continues to move ahead along with hanging chain conveyor system, through double grid plate cobalt source the time, the gamma ray that double grid plate cobalt source produces carries out irradiation to the tetrafluoroethylene powder, irradiation dose is 60KGy, hang the speed of chain conveyor system by the radioactivity size decision in double grid plate cobalt source, and controlled by the watch-keeping cubicle;
Step (5) to (6) is identical with embodiment one.
The above embodiment has only expressed embodiments of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a gamma-rays prepares the method for PTFE ultrafine powder in conjunction with hydrogen peroxide and tetracol phenixin, it is characterized in that, comprises the steps:
(1) the tetrafluoroethylene raw material with drying carries out the chilling processing with liquid nitrogen; It is the powder of 100-1000 μ m that tetrafluoroethylene raw material pulverizing after the chilling processing is become particle diameter;
(2) the tetrafluoroethylene powder is put into container, described container seals and is positioned on the automatic production line that runs through cobalt 60 radiation chambers, be provided with at least 1 spray equipment interface in it, cobalt 60 radiation chambers comprise automatic production line, at least 1 tetracol phenixin spray equipment and at least 1 hydrogen peroxide spray equipment, radiation divider wall and the watch-keeping cubicle that is positioned at middle at least 1 cobalt 60 irradiator of radiation chamber, process cobalt 60 irradiator;
(3) the tetrafluoroethylene powder is along with the automatic production line of opening at the uniform velocity enters radiation chamber, at the tetrafluoroethylene powder during through at least 1 cobalt 60 irradiator, described at least 1 tetracol phenixin spray equipment is to tetrafluoroethylene powder spray tetracol phenixin, at least 1 hydrogen peroxide spray equipment is to tetrafluoroethylene powder spray hydrogen peroxide, the hydrogen peroxide of spray and the weight ratio of tetrafluoroethylene powder are 3%-8%, and the weight ratio of the tetracol phenixin of spray and tetrafluoroethylene powder is 3%-8%;
(4) through described at least 1 cobalt 60 irradiator the time, the gamma ray that at least 1 cobalt 60 irradiator produce carries out irradiation to the tetrafluoroethylene powder, and irradiation dose is 40-60KGy;
(5) container that is equipped with through the tetrafluoroethylene powder of irradiation transports radiation chamber by automatic production line;
(6) with micronizer mill will pulverize again through the tetrafluoroethylene powder of irradiation, classification, fine polytetrafluoroethylpowder powder is dispersed into the following superfine powder of polytetrafluoroethylene of median size 5 μ m.
2. the method for claim 1, it is characterized in that, described at least 1 hydrogen peroxide spray equipment and at least 1 tetracol phenixin spray equipment are respectively to tetrafluoroethylene powder spray hydrogen peroxide and tetracol phenixin, the hydrogen peroxide of spray and the weight ratio of tetrafluoroethylene powder are 5%, and the weight ratio of the tetracol phenixin of spray and tetrafluoroethylene powder is 5%.
3. the method for claim 1 is characterized in that, described at least 1 cobalt 60 irradiator are single screen cobalt source.
4. the method for claim 1 is characterized in that, described at least 1 cobalt 60 irradiator are double grid plate cobalt source.
5. method according to claim 1, it is characterized in that, step (4) comprises that also described automatic production line and the container that the tetrafluoroethylene powder is housed are bonded together, and will pour the opening for feed of the described micronizer mill of step (5) through the tetrafluoroethylene powder of irradiation at the exit end of automatic production line.
6. method as claimed in claim 5, it is characterized in that, described micronizer mill comprises airflow nozzle, crushing chamber, pressurized air is gone into crushing chamber by the nozzle high-velocity jet, makes the fine polytetrafluoroethylpowder powder particle through irradiation collide repeatedly, rub, shear and pulverize at the joint place of multiply high pressure draft.
7. method as claimed in claim 6, it is characterized in that: described micronizer mill also comprises cyclonic separator, fly-ash separator and induced draft fan; Described micronizer mill comprises graded region, tetrafluoroethylene after crushing chamber is pulverized moves to graded region under the induced draft fan effect, under the grading wheel effect, the fine polytetrafluoroethylpowder powder particle is separated by globule size, the fine particle that meets granularity requirements enters cyclonic separator by grading wheel or fly-ash separator is collected, and the coarse particles that does not meet granularity requirements drops to crushing chamber to be continued to pulverize.
8. method as claimed in claim 7 is characterized in that, the airflow nozzle of described micronizer mill is laval nozzle.
9. the method described in claim 8 is characterized in that, described micronizer mill has the dry filter device, before the dry filter device is positioned at nozzle.
10. as each described method of claim 1-9, it is characterized in that described automatic production line is for realizing auto reversive bucket conveyor or hanging chain conveyor system.
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| CN107236063A (en) * | 2017-06-14 | 2017-10-10 | 广州华大生物科技有限公司 | A kind of preparation method of low molecular weight polytetrafluoroethylene |
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| JPH08327797A (en) * | 1995-05-29 | 1996-12-13 | Sumitomo Heavy Ind Ltd | Apparatus for optical micromachining of teflon |
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