CN100547117C - The silicon-tungsten corrosion inhibitor that is used for circulation cooling system of demineralized water - Google Patents
The silicon-tungsten corrosion inhibitor that is used for circulation cooling system of demineralized water Download PDFInfo
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- CN100547117C CN100547117C CNB2007100993546A CN200710099354A CN100547117C CN 100547117 C CN100547117 C CN 100547117C CN B2007100993546 A CNB2007100993546 A CN B2007100993546A CN 200710099354 A CN200710099354 A CN 200710099354A CN 100547117 C CN100547117 C CN 100547117C
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- silicon
- trolamine
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- silicate
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 229910001868 water Inorganic materials 0.000 title claims abstract description 51
- 230000007797 corrosion Effects 0.000 title claims abstract description 34
- 238000005260 corrosion Methods 0.000 title claims abstract description 34
- 238000001816 cooling Methods 0.000 title claims abstract description 32
- 239000003112 inhibitor Substances 0.000 title claims abstract description 32
- WNUPENMBHHEARK-UHFFFAOYSA-N silicon tungsten Chemical compound [Si].[W] WNUPENMBHHEARK-UHFFFAOYSA-N 0.000 title claims abstract description 9
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229960004418 trolamine Drugs 0.000 claims abstract description 33
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 17
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 claims abstract description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 14
- 150000001875 compounds Chemical class 0.000 claims abstract description 13
- 229910052802 copper Inorganic materials 0.000 claims abstract description 13
- 239000010949 copper Substances 0.000 claims abstract description 13
- 239000004615 ingredient Substances 0.000 claims abstract description 3
- 239000000126 substance Substances 0.000 claims abstract description 3
- 235000019353 potassium silicate Nutrition 0.000 claims description 29
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims description 25
- 239000012964 benzotriazole Substances 0.000 claims description 25
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 25
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 claims description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- YXIWHUQXZSMYRE-UHFFFAOYSA-N 1,3-benzothiazole-2-thiol Chemical compound C1=CC=C2SC(S)=NC2=C1 YXIWHUQXZSMYRE-UHFFFAOYSA-N 0.000 claims description 10
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 235000012239 silicon dioxide Nutrition 0.000 claims description 6
- 229960001866 silicon dioxide Drugs 0.000 claims description 6
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 4
- 239000004111 Potassium silicate Substances 0.000 claims description 4
- 239000000470 constituent Substances 0.000 claims description 4
- 239000011591 potassium Substances 0.000 claims description 4
- 229910052700 potassium Inorganic materials 0.000 claims description 4
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims description 4
- 229910052913 potassium silicate Inorganic materials 0.000 claims description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 230000005764 inhibitory process Effects 0.000 abstract description 5
- 238000011109 contamination Methods 0.000 abstract description 2
- 231100000252 nontoxic Toxicity 0.000 abstract description 2
- 230000003000 nontoxic effect Effects 0.000 abstract description 2
- 238000001223 reverse osmosis Methods 0.000 description 4
- 238000000108 ultra-filtration Methods 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000003134 recirculating effect Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- DBVJJBKOTRCVKF-UHFFFAOYSA-N Etidronic acid Chemical compound OP(=O)(O)C(O)(C)P(O)(O)=O DBVJJBKOTRCVKF-UHFFFAOYSA-N 0.000 description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003020 moisturizing effect Effects 0.000 description 2
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000008234 soft water Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000008400 supply water Substances 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000011964 heteropoly acid Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000012747 synergistic agent Substances 0.000 description 1
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- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The present invention relates to a kind of silicon-tungsten corrosion inhibitor that is used for circulation cooling system of demineralized water, its chemical ingredients by silicate, tungstate, trolamine, copper inhibitor is compound constitutes, weight proportion is: silicate 70-90%, tungstate 2.5-27%, trolamine 2.5-18%, copper inhibitor 0.5-1.5%.The present invention's inhibiter is applicable to that the circulation cooling system of demineralized water inhibition handles, and has efficient, low dosage, nontoxic, free of contamination characteristics.
Description
Technical field
The present invention relates to a kind of silicon-tungsten corrosion inhibitor that is used for recirculating cooling water system, be specially adapted to the circulation cooling system of demineralized water inhibition and handle.
Background technology
In industrial production, there are a large amount of technological processs need use water cooling.Along with social cityization and industrial continuous development, water resources is more and more nervous.For water saving, the cycles of concentration of industrial cycle water cooling system improves constantly, and reaches more than 4 times.Because cycles of concentration improves, the calcium ions and magnesium ions in the water constantly increases, and causes the circulating water cooling system fouling serious.Be head it off, circulation cooling system of demineralized water is more and more to be used.But at the circulating cooling system that uses de-mineralized water, calcium ions and magnesium ions is very low in the water, can not form incrustation scale.Since there is not the protection of dirt layer, the direct and metallic contact of oxygen in water, and Corrosion of Pipeline is very serious.Therefore must add effective corrosion inhibitors at circulation cooling system of demineralized water, could guarantee that cooling apparatus and pipeline are not corroded.
Past is not high at the cycles of concentration of hydrologic cycle cooling system, uses the less of DW system demineralized water system, and the inhibiter development that is used for circulation cooling system of demineralized water is slower.The inhibiter that can be used on circulation cooling system of demineralized water now has chromate corrosion inhibitors, molybdate inhibiter, silicate corrosion inhibitor, nitrite inhibiter.Chromate corrosion inhibitors is a kind of older chromate corrosion inhibitors, and corrosion mitigating effect is good, has toxicity, is again environmental pollutants, now seldom uses.Molybdate inhibiter toxicity is little, and the cost height uses less.Silicate corrosion inhibitor has nontoxicity, pollution-free characteristics, but to the water quality requirement height, and metering is not enough easily to produce spot corrosion, control badly also can form silicate scale, so less use.Silicon inhibiter as U.S. Betz company, its prescription is water glass 10ppm, 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid 10ppm, carboxymethyl cellulose 20ppm, benzotriazole 3ppm, this inhibiter only is applicable to the service water circulating cooling system, can not be used for circulation cooling system of demineralized water.The patent " Si series corrosion inhibitor that is used for soft water airtight circulating cooling system " (ZL 95117456.8) of Capital Iron ﹠ Steel General Co's 1995 applications, its proportioning is that water glass is (with SiO
2Meter) 500-1000ppm, multi-component copolymer sodium polyacrylate 5-10ppm, 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid 5-10ppm, benzotriazole 1-2ppm, this inhibiter adding consistency is higher, be applicable to soft water airtight circulating cooling system, be used for the open type DW system demineralized water system, the danger that causes the silicon dirt is arranged.
Summary of the invention
The objective of the invention is to overcome the deficiency that goes up the art technology, a kind of silicate and tungstate composite inhibiter are provided, and this inhibiter silicate content is low, can avoid the formation of silicon dirt, be applicable to circulation cooling system of demineralized water, effectively prevent the corrosion of circulation cooling system of demineralized water.
The technical solution adopted in the present invention is: the silicon-tungsten corrosion inhibitor chemical ingredients that is used for circulation cooling system of demineralized water by silicate, tungstate, trolamine, copper inhibitor is compound constitutes, each component is by weight ratio: silicate 70-90%, tungstate 2.5-27%, trolamine 2.5-18%, copper inhibitor 0.5-1.5%.Wherein silicate is that water glass, potassium silicate are wherein a kind of, and tungstate is that sodium wolframate, potassium wolframate, ammonium tungstate are wherein a kind of, and copper inhibitor is that benzotriazole, mercaptobenzothiazole are wherein a kind of.
The use metering of this inhibiter in circulation cooling system of demineralized water is: silicate is in silicon-dioxide, tungstate, trolamine, copper inhibitor are in industrial goods effective constituent weight, its concentration proportioning is: silicon-dioxide 60-200ppm, tungstate 5-30ppm, trolamine 5-20ppm, copper inhibitor 1-3ppm.
Inhibiter of the present invention is a kind of oxide film precipitation membrane hybrid corrosion inhibitor.The type oxide film inhibiter is passivation membranous type inhibiter again.It can make oxidation on metal surface, forms the corrosion resistant passive film of one deck densification and prevents corrosion.Generally be in solution, to make steel surface generate one deck γ-Fe by oxygenant
2O
3The film of metal oxide because its existence has changed the corrosion of metal electromotive force, and reduces the speed of corrosion reaction by passivation phenomenon.
Silicate is a kind of precipitation membranous type inhibiter, but adding consistency is higher, and the dosing quantity not sufficient also will cause serious pitting.Water glass and sodium wolframate form silicotungstic heteropolyacid, have certain oxidation characteristic.Utilize this characteristic, form the compound synergic effect in conjunction with the silicate rust inhibition.Trolamine is a kind of inhibition synergistic agent.Select benzotriazole or mercaptobenzothiazole special corrosion inhibitor for use, prevent the corrosion of copper part as copper.
Embodiment
Embodiment 1
Inhibiter by water glass, sodium wolframate, trolamine, benzotriazole is compound constitutes, its weight proportion is water glass 82.6%, sodium wolframate 8.3%, trolamine 8.3%, benzotriazole 0.83%.
Embodiment 2
Inhibiter by water glass, sodium wolframate, trolamine, benzotriazole is compound constitutes, its weight proportion is water glass 88.3%, sodium wolframate 5.84%, trolamine 5.84%, benzotriazole 0.58%.
Embodiment 3
Inhibiter by water glass, sodium wolframate, trolamine, benzotriazole is compound constitutes, its weight proportion is water glass 71%, sodium wolframate 14.2%, trolamine 14.2%, benzotriazole 0.71%.
Embodiment 4
Inhibiter by water glass, ammonium tungstate, trolamine, benzotriazole is compound constitutes, its weight proportion is water glass 78%, sodium wolframate 10.4%, trolamine 10.4%, benzotriazole 1.1%.
Embodiment 5
Inhibiter by potassium silicate, sodium wolframate, trolamine, benzotriazole is compound constitutes, its weight proportion is potassium silicate 78%, sodium wolframate 10.4%, trolamine 10.4%, benzotriazole 1.1%.
Embodiment 6
Inhibiter by water glass, sodium wolframate, trolamine, mercaptobenzothiazole is compound constitutes, its weight proportion is water glass 82.6%, sodium wolframate 8.3%, trolamine 8.3%, mercaptobenzothiazole 0.83%.
Embodiment 7
Inhibiter by water glass, potassium wolframate, trolamine, benzotriazole is compound constitutes, its weight proportion is water glass 78%, potassium wolframate 10.4%, trolamine 10.4%, benzotriazole 1.1%.
With specific examples this inhibiter result of use is described below: be used for cold rolling open type recirculating cooling water system A, this system uses de-mineralized water as system's make up water, and de-mineralized water adds the first-stage reverse osmosis treatment process by the middle hydromining of municipal sewage plant after biological treatment with ultrafiltration and makes.33 ℃ of system water supply water temperatures, 38 ℃ of backwater water temperatures, cooling apparatus uses glass fibre reinforced plastics cooling tower.Corrosion inhibitor formula by water glass, sodium wolframate, trolamine, benzotriazole is compound constitutes, in industrial goods effective constituent weight, its proportioning is water glass: water glass (SiO in silicon-dioxide, sodium wolframate, trolamine, benzotriazole
2): sodium wolframate: trolamine: benzotriazole=100 (ppm): 10 (ppm): 10 (ppm): 1 (ppm).The preparation of inhibiter: take by weighing sodium wolframate 10g and be dissolved in 1 liter of de-mineralized water, add trolamine 10g, benzotriazole 1g and water glass 100g then successively.
Adopt the rotary hanging plate corrosion test, former water is that ultrafiltration adds the de-mineralized water after first-stage reverse osmosis is handled, 45 ℃ of test water temperatures, and 145 rev/mins of rotating speeds were tested total duration 163 hours, every 24 hours about 300ml of moisturizing.The test determination result, carbon steel lacing film corrosion speed 0.0242mm/a satisfies the requirement of national standard less than 0.125mm/a.
Be used for de-mineralized water recirculating cooling water system B, system uses de-mineralized water as system's make up water, and de-mineralized water adopts ultrafiltration to add the first-stage reverse osmosis treatment process and makes, 33 ℃ of system water supply water temperatures, and 38 ℃ of backwater water temperatures, cooling apparatus uses glass fibre reinforced plastics cooling tower.Corrosion inhibitor formula by water glass, sodium wolframate, trolamine, benzotriazole is compound constitutes, water glass is with silicon-dioxide (SiO
2) meter, sodium wolframate, trolamine, benzotriazole are in industrial goods effective constituent weight, its proportioning is: water glass (SiO
2): sodium wolframate: trolamine: benzotriazole=150 (ppm): 10 (ppm): 10 (ppm): 1 (ppm).The preparation of inhibiter: take by weighing sodium wolframate 10g and be dissolved in 1 liter of de-mineralized water, add trolamine 10g, benzotriazole 1g and water glass 150g then successively.
Adopt the rotary hanging plate corrosion test, former water is that ultrafiltration adds the de-mineralized water after first-stage reverse osmosis is handled, 45 ℃ of test water temperatures, and 145 rev/mins of rotating speeds were tested total duration 163h, every 24 hours about 300ml of moisturizing.The test determination result, carbon steel lacing film corrosion speed 0.0216mm/a satisfies the requirement of national standard less than 0.125mm/a.
Result of the test shows, adopts corrosion inhibiter of the present invention to be applicable to circulation cooling system of demineralized water inhibition processing, Have efficient, low dosage, nontoxic, free of contamination characteristics.
Claims (3)
1, a kind of silicon-tungsten corrosion inhibitor that is used for circulation cooling system of demineralized water, it is characterized in that: the silicon-tungsten corrosion inhibitor chemical ingredients by silicate, tungstate, trolamine, copper inhibitor is compound constitutes, each component is by weight ratio: silicate 70-90%, tungstate 2.5-27%, trolamine 2.5-18%, copper inhibitor 0.5-1.5%; Described copper inhibitor is that benzotriazole, mercaptobenzothiazole are wherein a kind of.
2, the silicon-tungsten corrosion inhibitor that is used for circulation cooling system of demineralized water according to claim 1 is characterized in that: described silicate is that water glass, potassium silicate are wherein a kind of, and tungstate is that sodium wolframate, potassium wolframate, ammonium tungstate are wherein a kind of.
3, the silicon-tungsten corrosion inhibitor that is used for circulation cooling system of demineralized water according to claim 1 and 2, it is characterized in that: the use metering of this inhibiter in circulation cooling system of demineralized water is: silicate is in silicon-dioxide, tungstate, trolamine, copper inhibitor are in industrial goods effective constituent weight, its concentration proportioning is: silicon-dioxide 60-200ppm, tungstate 5-30ppm, trolamine 5-20ppm, copper inhibitor 1-3ppm.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100993546A CN100547117C (en) | 2007-05-17 | 2007-05-17 | The silicon-tungsten corrosion inhibitor that is used for circulation cooling system of demineralized water |
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| CNB2007100993546A CN100547117C (en) | 2007-05-17 | 2007-05-17 | The silicon-tungsten corrosion inhibitor that is used for circulation cooling system of demineralized water |
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| CN100547117C true CN100547117C (en) | 2009-10-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101851759B (en) * | 2009-03-30 | 2011-12-28 | 中国文化遗产研究院 | Tannin corrosion inhibitor for protecting iron cultural relics |
| CN104060277A (en) * | 2013-03-20 | 2014-09-24 | 江苏核电有限公司 | Anticorrosion technology of nuclear power unit nuclear island equipment cooling water system and corrosion inhibitor |
| CN103214107A (en) * | 2013-04-10 | 2013-07-24 | 同济大学 | Silicate and polyamidoamine composite and environment-friendly corrosion inhibitor applied to deionized water circulating cooling system |
| CN105036363B (en) * | 2015-07-13 | 2017-03-01 | 鞍钢贝克吉利尼水处理有限公司 | A kind of composite corrosion inhibitor of suitable demineralized water and preparation method |
| CN106400027A (en) * | 2016-11-27 | 2017-02-15 | 湖南金裕化工有限公司 | Efficient metal corrosion inhibitor and preparation method thereof |
| CN110158093A (en) * | 2018-03-27 | 2019-08-23 | 德蓝水技术股份有限公司 | One kind being used for softened water or demineralized water closed circulation cooling system corrosion inhibiter |
| CN113321321B (en) * | 2021-05-20 | 2022-11-29 | 淄博爱迪毅环保技术有限公司 | Corrosion and scale inhibitor for aluminum pipe hot method seawater desalination and preparation process thereof |
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Address after: 100041 Beijing Shijingshan District Shougang Corporation Patentee after: SHOUGANG GROUP Co.,Ltd. Address before: 100041 Beijing Shijingshan District Shougang Corporation Patentee before: SHOUGANG Corp. |
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Granted publication date: 20091007 |
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| CF01 | Termination of patent right due to non-payment of annual fee |