CN102766257B - Method for reducing metal impurities in poly(aryl ether ketone) polymer - Google Patents
Method for reducing metal impurities in poly(aryl ether ketone) polymer Download PDFInfo
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- CN102766257B CN102766257B CN201210131100.9A CN201210131100A CN102766257B CN 102766257 B CN102766257 B CN 102766257B CN 201210131100 A CN201210131100 A CN 201210131100A CN 102766257 B CN102766257 B CN 102766257B
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- 229920006260 polyaryletherketone Polymers 0.000 title claims abstract description 69
- 239000012535 impurity Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 41
- 229910052751 metal Inorganic materials 0.000 title abstract description 24
- 239000002184 metal Substances 0.000 title abstract description 23
- 229920000642 polymer Polymers 0.000 title description 4
- 238000000746 purification Methods 0.000 claims abstract description 20
- 239000007864 aqueous solution Substances 0.000 claims abstract description 17
- 238000005406 washing Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000012153 distilled water Substances 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 5
- DBVJJBKOTRCVKF-UHFFFAOYSA-N Etidronic acid Chemical compound OP(=O)(O)C(O)(C)P(O)(O)=O DBVJJBKOTRCVKF-UHFFFAOYSA-N 0.000 claims description 19
- 239000002245 particle Substances 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 7
- 206010013786 Dry skin Diseases 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 239000000126 substance Substances 0.000 abstract description 10
- 230000015556 catabolic process Effects 0.000 abstract description 3
- 238000006731 degradation reaction Methods 0.000 abstract description 3
- 238000001914 filtration Methods 0.000 abstract description 2
- 239000002861 polymer material Substances 0.000 abstract description 2
- 238000003756 stirring Methods 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 abstract 2
- 239000003153 chemical reaction reagent Substances 0.000 abstract 1
- XQRLCLUYWUNEEH-UHFFFAOYSA-N diphosphonic acid Chemical compound OP(=O)OP(O)=O XQRLCLUYWUNEEH-UHFFFAOYSA-N 0.000 abstract 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract 1
- 230000001988 toxicity Effects 0.000 abstract 1
- 231100000419 toxicity Toxicity 0.000 abstract 1
- 150000002739 metals Chemical class 0.000 description 18
- 238000012545 processing Methods 0.000 description 11
- 239000012629 purifying agent Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 239000004696 Poly ether ether ketone Substances 0.000 description 4
- 229920005601 base polymer Polymers 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- 229920002530 polyetherether ketone Polymers 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 239000013543 active substance Substances 0.000 description 2
- -1 alkali metal salt Chemical class 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000008366 benzophenones Chemical class 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 229920006258 high performance thermoplastic Polymers 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000000120 microwave digestion Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000010534 nucleophilic substitution reaction Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Abstract
The invention belongs to the technical field of polymer material, and relates to a method, used in a production process, for reducing metal impurities in poly(aryl ether ketone). The method comprises the following steps: 1) purification: fully mixing poly(aryl ether ketone) with hydroxy ethidene diphosphonic acid aqueous solution with mass concentration of 0.1-2% at 40-100 DEG C for 0.5-3 h, wherein time for mixing and stirring is preferably 1-2 h, and filtering; 2) washing: washing the purified poly(aryl ether ketone) with distilled water, until conductivity of the aqueous solution is below 20 muS / cm; and 3) drying: drying the washed poly(aryl ether ketone) at 120-140 DEG C for 4-6 h to obtain poly(aryl ether ketone) with metal impurities removed. The method can not only reduce content of the metal impurities in the poly(aryl ether ketone) and improve product quality; besides the used reagents have excellent chemical stability, small dosage, and no self toxicity or pollution, can be treated with biochemical degradation in a later period of production, and will not harm the environment.
Description
Technical field
The invention belongs to technical field of polymer materials, be specifically related to a kind of synchronously carry out in production process for reducing the method for polyaryletherketone metallic impurity.
Background technology
Polyaryletherketone is a kind of high performance thermoplastic engineering plastic, with its outstanding thermal characteristics, mechanical property, flame retardant resistance, dielectric properties etc., is widely used aerospace, telecommunications, civilian high-tech and medical field.At present, polyaryletherketone has become a large focus of macromolecular material research field, and the application in its future will be more extensive.Meanwhile, along with scientific and technological development, the exploitation of new technology, frontier also proposes higher requirement to polyaryletherketone.
With regard to current disclosed patent and bibliographical information; the polyaryletherketone of large-scale production adopts halogenated benzophenone, biphenol monomer and an alkali metal salt in high-temperature solvent, to carry out nucleophilic substitution more; the polymkeric substance generating is pulverized after cooling; with organic solvent extraction high-temperature solvent, remove by-product inorganic salts with deionized water again.Due to the deionized water etc. of producing raw material used, solvent and washing use all the metal ion that has more or less exist, it inevitably enters into polymkeric substance.The equipment of production use in addition, also can cause metallic element to enter into material.Polyaryletherketone is in applied at elevated temperature process, and metallic impurity can accelerate the degraded of polymkeric substance, makes the thermostability variation of polymkeric substance, simultaneously due to the existence of metallic impurity, also can make the insulating property of polymkeric substance reduce.Therefore, reduce the content of metallic impurity, become one of important step improving polyaryletherketone quality product.
The purification process adopting in polyaryletherketone production process is also more, there are the organic solvent of employing and the coefficient purification process of tensio-active agent (referring to CN200410081436), there is the method (referring to CN200910009128) that adopts acid solution washing, the treatment process (referring to US20050004340) that adopts in addition high pressure, these purification process cut both ways in actual production.Such as, adopt organic solvent and tensio-active agent to carry out the method for purifying, increase the consumption of organic solvent, increase production cost, adopt the purification process of High Temperature High Pressure, improved the service requirements of equipment, adopted the method for acid solution purifying, a large amount of acid solutions has been brought difficulty to the biochemical treatment of later stage factory effluent.
Summary of the invention
The present invention is directed to the present situation that current polyaryletherketone is produced, provide the purification process of a kind of economy, polyaryletherketone effective, that easily go, to solve the high problem of metals content impurity in poly aryl ether ketone polymer.
The technical solution adopted for the present invention to solve the technical problems is:
A method that reduces metallic impurity in polyaryletherketone base polymer, the method comprises the following steps:
1) purifying: at the temperature of 40～100 DEG C, the 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid aqueous solution that is 0.1～2% with mass concentration by polyaryletherketone fully mixes, after 0.5～3 hour, filters; Preferably 1～2 hour time of mix and blend;
2) washing: the polyaryletherketone distilled water wash after purifying, to the specific conductivity of the aqueous solution below 20 μ S/cm;
3) dry: the polyaryletherketone after washing, 120～140 DEG C of temperature range inner dryings 4～6 hours, obtains the polyaryletherketone of metallic impurity.
The present invention is a kind of method that reduces metallic impurity in polyaryletherketone base polymer under atmospheric pressure state, adopt 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid as purifying agent, add the certain density 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid aqueous solution to poly aryl ether ketone polymer powder, carry out purification process, use again deionized water wash, after dry, can obtain the poly aryl ether ketone polymer of low metals content impurity.The conventional way of removing at present impurity in material is to add water washing, dilution, water consumption and washing times are more like this, in the present invention, add after 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid, can disposable metal ion be carried out to " packing ", remove again, so not only washing times has reduced, and the effect of washing has strengthened.The inventive method can reduce the metals content impurity of polyaryletherketone base polymer, improves the thermostability of polymkeric substance, reduces the electroconductibility of polymkeric substance, and the method is simple to operate, can synchronize and carry out with production process, purifying agent consumption is few, cheap, can significantly not increase production cost.
As preferably, in purification step, it is 0.05 that described polyaryletherketone is ground into particle diameter in advance
~the powder of 0.5mm.More preferred scheme is that polyaryletherketone is ground into the powder that particle diameter is 0.05～0.2mm in advance.
As preferably, the mass concentration of the described 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid aqueous solution is 0.5～1%.
As preferably, the weight ratio of described polyaryletherketone and the 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid aqueous solution is 1:1～10.
As preferably, the weight ratio of described polyaryletherketone and the 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid aqueous solution is 1:3～5.
As preferably, in purification step, described temperature range is 60～90 DEG C.
In the present invention, the temperature when consumption of purifying agent, the time of purification process, purifying and the particle diameter of purifying mass all have a certain impact to the effect of purification process.Purifying agent consumption is very few, does not reach desirable purification effect, and purifying agent consumption is excessive, can produce the waste of purifying agent and bath water.The purifying time is too short, and impurity reacts with purifying agent not exclusively, and purifying overlong time can increase the production time.Cleansing temp is low, and it is best that the activity of purifying agent can not reach, and excess Temperature has increased again energy consumption.The particle diameter of material is too small, can produce material waste in the time filtering, and particle diameter is excessive, and material can produce parcel to impurity, and impurity is difficult for separating out, and purifying agent cannot react with metallic impurity.Through a large amount of experimental verifications, the present invention is both economical being suitable for, and purification effect is more satisfactory.
The invention has the beneficial effects as follows: the method not only can reduce the content of metallic impurity in polyaryletherketone, improve the quality of products, and institute's with medicament has good chemical stability, dosing is little, self is substantially nontoxic, nuisanceless pollution, is also easy to carry out biochemical degradation in the production later stage, can not produce harm to environment.
Embodiment
Below by specific embodiment, technical scheme of the present invention is described in further detail.Should be appreciated that enforcement of the present invention is not limited to the following examples, any pro forma accommodation that the present invention is made and/or change all will fall into protection domain of the present invention.
In the present invention, if not refer in particular to, all part, per-cents are weight unit, and all equipment and raw materials etc. all can be buied from market or the industry is conventional.
The present invention adopts following methods to evaluate purification effect: the material (polyaryletherketone) before and after purifying, by micro-wave digestion, then is detected to its metals content impurity with inductive coupling plasma emission spectrograph, and contrast.
Embodiment 1:
Get 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid 2g, join 400ml distilled water, be mixed with the 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid aqueous solution (mass concentration is 0.5%).Get the polyether-ether-ketone powder 130g that the particle diameter of pulverization process is 0.05～0.2mm in advance, be encased in three mouthfuls of vials of 1000ml, and the 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid aqueous solution preparing is also joined in three mouthfuls of vials.Three mouthfuls of vials are put into heating jacket, whipping appts is installed, start agitator, start to heat up.In the time that temperature reaches 60 DEG C, stop heating, continue to stir after 1 hour, the aqueous solution is leached.With 500ml distilled water wash material after treatment, wash 2～5 times, detect washing electrical conductivity of water, in the time that specific conductivity is less than 20 μ S/cm, polyether-ether-ketone powder is put into baking oven, Temperature Setting is 140 DEG C, be dried 4 hours, obtain the polyaryletherketone sample CPAEK-1 of low metals content impurity.
Embodiment 2:
According to the method for embodiment 1, just change polyether-ether-ketone into 80g, after processing, obtain the polyaryletherketone sample CPAEK-2 of low metals content impurity.
Embodiment 3:
According to the method for embodiment 1, just changing 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid into 3g(mass concentration is 0.75%), after processing, obtain the polyaryletherketone sample CPAEK-3 of low metals content impurity.
Embodiment 4:
According to the method for embodiment 2, just changing 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid into 0.4g(mass concentration is 0.1%), after processing, obtain the polyaryletherketone sample CPAEK-4 of low metals content impurity.
Embodiment 5:
According to the method for embodiment 1, just changing 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid into 4g(mass concentration is 1%), after processing, obtain the polyaryletherketone sample CPAEK-5 of low metals content impurity.
Embodiment 6:
According to the method for embodiment 2, just changing 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid into 8g(mass concentration is 2%), after processing, obtain the polyaryletherketone sample CPAEK-6 of low metals content impurity.
Embodiment 7:
According to the method for embodiment 3, just change the purifying time into 2 hours, after processing, obtain the polyaryletherketone sample CPAEK-7 of low metals content impurity.
Embodiment 8:
According to the method for embodiment 4, just change the purifying time into 2 hours, after processing, obtain the polyaryletherketone sample CPAEK-8 of low metals content impurity.
Embodiment 9:
According to the method for embodiment 7, just change cleansing temp into 70 DEG C, after processing, obtain the polyaryletherketone sample CPAEK-9 of low metals content impurity.
Embodiment 10:
According to the method for embodiment 8, just change cleansing temp into 90 DEG C, after processing, obtain the polyaryletherketone sample CPAEK-10 of low metals content impurity.
Embodiment 11:
According to the method for embodiment 3, just the particle diameter of polyether-ether-ketone is controlled to 0.2 ~ 0.5mm, after processing, obtain the polyaryletherketone sample CPAEK-11 of low metals content impurity.
Embodiment 12:
According to the method for embodiment 4, just drying temperature is set as to 120 DEG C, after processing, obtain the polyaryletherketone sample CPAEK-12 of low metals content impurity.
The polyaryletherketone of the low metals content impurity that embodiment 1-12 makes, the metal content numerical value before and after its purifying is in table 1.
Known according to the result of table 1, adopt the metals content impurity of the present invention's polyaryletherketone after treatment obviously to reduce.In addition, sample after treatment is carried out to thermogravimetic analysis (TGA) in table 2, and compare before purification process, heat decomposition temperature has corresponding raising.
Table 2
| Sample | Purifying polyethers prior ether ketone | CPAEK-1 | CPAEK-2 | CPAEK-3 | CPAEK-4 | CPAEK-5 | CPAEK-6 |
| 5% thermal weight loss (DEG C) | 548 | 554 | 558 | 556 | 552 | 556 | 557 |
| Sample | ? | CPAEK-7 | CPAEK-8 | CPAEK-9 | CPAEK-10 | CPAEK-11 | CPAEK-12 |
| 5% thermal weight loss (DEG C) | ? | 556 | 551 | 557 | 553 | 556 | 553 |
To sum up, the inventive method not only can reduce the content of metallic impurity in polyaryletherketone, improve the quality of products, and institute's with medicament has good chemical stability, dosing is little, self is substantially nontoxic, nuisanceless pollution, is also easy to carry out biochemical degradation in the production later stage, can not produce harm to environment, therefore economical, effectively, Yi Hang, reduced the production cost of high-quality polyaryletherketone.
Above-described embodiment is preferably scheme of one of the present invention, not the present invention is done to any pro forma restriction, also has other variant and remodeling under the prerequisite that does not exceed the technical scheme that claim records.
Claims (10)
1. reduce a method for metallic impurity in polyaryletherketone, it is characterized in that comprising the following steps:
1) purifying: at the temperature of 40～100 DEG C, the 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid aqueous solution that is 0.1～2% with mass concentration by polyaryletherketone fully mixes, after 0.5～3 hour, filters;
2) washing: the polyaryletherketone distilled water wash after purifying, to the specific conductivity of the aqueous solution below 20 μ S/cm;
3) dry: the polyaryletherketone after washing, 120～140 DEG C of temperature range inner dryings 4～6 hours, obtains the polyaryletherketone of metallic impurity.
2. the method for metallic impurity in minimizing polyaryletherketone according to claim 1, is characterized in that: in purification step, described polyaryletherketone is ground into the powder that particle diameter is 0.05～0.5mm in advance.
3. the method for metallic impurity in minimizing polyaryletherketone according to claim 2, is characterized in that: in purification step, described polyaryletherketone is ground into the powder that particle diameter is 0.05～0.2mm in advance.
4. according to the method for metallic impurity in the minimizing polyaryletherketone described in claim 1 or 2 or 3, it is characterized in that: the mass concentration of the described 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid aqueous solution is 0.5～1%.
5. according to the method for metallic impurity in the minimizing polyaryletherketone described in claim 1 or 2 or 3, it is characterized in that: the weight ratio of described polyaryletherketone and the 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid aqueous solution is 1:1～10.
6. the method for metallic impurity in minimizing polyaryletherketone according to claim 4, is characterized in that: the weight ratio of described polyaryletherketone and the 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid aqueous solution is 1:1～10.
7. according to the method for metallic impurity in the minimizing polyaryletherketone described in claim 1 or 2 or 3, it is characterized in that: the weight ratio of described polyaryletherketone and the 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid aqueous solution is 1:3～5.
8. according to the method for metallic impurity in the minimizing polyaryletherketone described in claim 1 or 2 or 3, it is characterized in that: in purification step, described temperature range is 60～90 DEG C.
9. the method for metallic impurity in minimizing polyaryletherketone according to claim 4, is characterized in that: in purification step, described temperature range is 60～90 DEG C.
10. the method for metallic impurity in minimizing polyaryletherketone according to claim 7, is characterized in that: in purification step, described temperature range is 60～90 DEG C.
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| CN105885035A (en) * | 2016-06-30 | 2016-08-24 | 山东凯盛新材料股份有限公司 | Process for removing metal ions in poly(ether-ketone-ketone) crude product |
| CN106046349A (en) * | 2016-06-30 | 2016-10-26 | 山东凯盛新材料股份有限公司 | Process for refining polyether ketone crude product by virtue of 2-hydroxyphosphonoacetic acid |
| CN106046353A (en) * | 2016-06-30 | 2016-10-26 | 山东凯盛新材料股份有限公司 | Process for refining polyether ketone crude product by virtue of 2,3-dihydrobutanedioic acid |
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| CN106146827A (en) * | 2016-06-30 | 2016-11-23 | 山东凯盛新材料股份有限公司 | Method PEKK crude product refined with 2 hydroxyl succinic acid |
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| CN106046351B (en) * | 2016-06-30 | 2018-11-20 | 山东凯盛新材料股份有限公司 | The method for removing metal ion in polyether ketone ketone crude product |
| CN105885031A (en) * | 2016-06-30 | 2016-08-24 | 山东凯盛新材料股份有限公司 | Method for refining poly(ether-ketone-ketone) crude product by using ethylenediamine tetramethylene phosphonic acid |
| CN105968342A (en) * | 2016-06-30 | 2016-09-28 | 山东凯盛新材料股份有限公司 | Process for refining crude polyetheretherketone using 2-phosphonobutane-1,2,4-tricarboxylic acid |
| CN106046347A (en) * | 2016-06-30 | 2016-10-26 | 山东凯盛新材料股份有限公司 | Method for refining polyetherketone ketone crude product by using ethylenediamine tetramethylenephosphonic acid |
| CN106046354B (en) * | 2016-06-30 | 2018-11-20 | 山东凯盛新材料股份有限公司 | The technique that polyether ketone ketone crude product is refined with ethylenediamine tetramethylene phosphonic acid |
| CN105885034A (en) * | 2016-06-30 | 2016-08-24 | 山东凯盛新材料股份有限公司 | Method for refining poly(ether-ketone-ketone) crude product by adopting 2,3-dihydroxybutanedioic acid |
| CN106146828A (en) * | 2016-06-30 | 2016-11-23 | 山东凯盛新材料股份有限公司 | Use the method that PEKK crude product is refined by 2 hydroxyl succinic acid |
| CN106046350A (en) * | 2016-06-30 | 2016-10-26 | 山东凯盛新材料股份有限公司 | Method for refining polyetherketoneketone crude product by using 2-hydroxyphosphonoacetic acid |
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| CN1269872C (en) * | 2004-12-09 | 2006-08-16 | 四川大学 | Method for purifying poly ether-ether-ketone |
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| CN1120575A (en) * | 1994-10-14 | 1996-04-17 | 王中亭 | Removal of metal from oil with organic phospho acid and its salt |
| CN101486784A (en) * | 2009-02-19 | 2009-07-22 | 吉林金正高分子材料研发有限公司 | Method for effectively reducing metal content in polyetheretherketone |
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