CN100374840C - Pressure testing liquid for metal container and conduit and preparation process thereof - Google Patents
Pressure testing liquid for metal container and conduit and preparation process thereof Download PDFInfo
- Publication number
- CN100374840C CN100374840C CNB2005100209751A CN200510020975A CN100374840C CN 100374840 C CN100374840 C CN 100374840C CN B2005100209751 A CNB2005100209751 A CN B2005100209751A CN 200510020975 A CN200510020975 A CN 200510020975A CN 100374840 C CN100374840 C CN 100374840C
- Authority
- CN
- China
- Prior art keywords
- pressure testing
- testing liquid
- acid
- add
- pipeline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Lubricants (AREA)
Abstract
The present invention relates to pressure testing liquid for testing pressure for metal containers, pipelines, etc., which is prepared by the following raw materials of 4 to 10 portions of C8 to C18 higher fatty acids, 30 to 55 portions of organic amine, 7 to 14 portions of boracic acids and/or borate, 2.5 to 10 portions of aromatic carboxylic acids or derivatives, 3 to 11 portion polyhydric alcohol, 15 to 30 portions of water and 0.001 to 0.1 portion of benzotriazole calculated according to a total weight as 100 portions. The present invention has the advantages of low cost of the production raw materials, little toxicity, simple preparation method, no special requirement to preparation equipment, good rust preventing and corrosion preventing performance of the obtained pressure testing liquid, safety and reliability, and provides a new choice for leakage and safety checks.
Description
Technical field
The present invention relates to a kind of pressure testing liquid that canister, pipeline etc. carry out pressure testing that is used for, this pressure testing liquid is specially adapted to the heavy (merchant) mill laminar flow apparatus.
Background technology
At machine-building, chemical industry, metallurgy industry etc., often need carry out the pressure testing test to canister, pipeline etc.This test is a very important critical process, and the consumption of the pressure testing liquid of its use is very huge again.The solution that present pressure testing liquid adopts various mineral oil, synthetic oil, phosphate, water-ethylene glycol and is made up of water and other compound.These pressure testing liquids have the transmission pressure stability, change little advantage in the pressured state lower volume certainly, and the pressure testing result is accurate, can not produce deleterious effect to container, pipeline and O-ring seal etc. in pressure testing and follow-up use simultaneously, as corrosion, O-ring seal fracture etc.; But the material expensive of this class pressure testing liquid, if adopt the light water pressure testing of tap water one class, though can solve price and environmental pollution problems, light water also very easily causes the corrosion of container, pipeline without any lubrication.
Pressure testing liquid has strong carcinogenicity with adding nitrite, sodium bichromate (potassium) etc. in the oil usually again to the people, easily the compound that environment is polluted.Make up to now rolling mill particularly the pressure testing of heavy (merchant) mill laminar flow apparatus promptly seal with security inspection and do not have special-purpose pressure testing liquid, the solution that generally adopts mineral oil, synthetic oil, phosphate, water-ethylene glycol and form by water and other compound.
Summary of the invention
Technical matters to be solved by this invention provides a kind of pressure testing liquid, and the preparation method of this pressure testing liquid also is provided simultaneously.
The technical solution adopted for the present invention to solve the technical problems is:
The pressure testing liquid that is used for canister and pipeline provided by the invention is by comprising that following feedstock production forms: C8～C18 higher fatty acid, organic amine, boric acid and/or borate, aromatic carboxylic acid or its esters or derivatives thereof, polyvalent alcohol, benzotriazole, water.Wherein the reactant that synthesizes with C8～C18 higher fatty acid and organic amine is the key component that pressure testing liquid of the present invention has the anti-rust and lubrication function.
Described pressure testing liquid is 100 parts by general assembly (TW), is formed by following feedstock production:
C8～4～10 parts of C18 higher fatty acid, 30～55 parts of organic amines, boric acid and/or 7～14 parts of borates, aromatic carboxylic acid or 2.5～10 parts of its esters or derivatives thereofs, 3～11 parts of polyvalent alcohols, 15～30 parts in water, benzotriazole 0.001-0.1 part, during use with the pressure testing liquid of preparation and water with 1: 10～33 dilution proportion.
Wherein, described C8～C18 higher fatty acid is the one or more combination thing in dodecenylsuccinic acid, decanedioic acid, lauric acid, stearic acid, the oleic acid.
Described organic amine is vinyl amine derivatives such as ethylenediamine, diethylenetriamine or monoethanolamine, diethanolamine, triethanolamine etc.
Described aromatic carboxylic acid or its salt or derivant are: benzoic acid or phthalic acid or salt of the two or derivative ester.
Described polyvalent alcohol is that molecular weight is one or more the composition in the polyglycol, propylene glycol, glycerine, diglycol, glycerine, triethylene glycol, ethylene glycol, polyvinyl alcohol (PVA) of 200-800.
The preparation method who is used for the pressure testing liquid of canister and pipeline provided by the invention comprises the steps:
(1) organic amine is warming up to 120 ℃～195 ℃, the C8～C18 higher fatty acid that adds 4～10 parts reacts;
(2) then boric acid and/or borate being joined in the above-mentioned reactant liquor, is to carry out acylation reaction under 120 ℃～165 ℃ the condition in temperature, and the reaction time was controlled at 1.5～2 hours;
(3) after above-mentioned reaction finishes, add aromatic carboxylic acid or its salt or derivant, or derivatives thereof, temperature is controlled at 120 ℃～140 ℃, and the viscosity for the treatment of product reaches more than 60 centipoises/25 ℃, stops reaction;
(4) stop to naturally cool to below 80 ℃ after the reaction, add polyvalent alcohol, fully stir, adjust pH value to 7～10, add benzotriazole and water and obtain pressure testing liquid.
Wherein the reaction time in the step (1) is 2～2.5 hours.
In the commercial Application pressure testing liquid and water are used after with 1: 10～33 dilution proportion.
The raw material sources of pressure testing liquid of the present invention is extensive, is common chemical materials, and cost is low, and price only is below 1/10 of mineral oil, synthetic oil or water-ethylene glycol.The preparation method of pressure testing liquid of the present invention is simple simultaneously, and preparation equipment is not had specific (special) requirements.The pressure testing liquid that obtains is anti-to be embroidered, Corrosion Protection is good, and safe and reliable, for sealing and security inspection provide a kind of new selection.
Below mode by specific embodiment the present invention is further described, be qualification but should not be construed as to subject area of the present invention, all modifications of making based on the foregoing invention theme, replace the technical scheme that realizes and all belong to the present invention.
Embodiment
Embodiment one:
Composition of raw materials: triethanolamine 120Kg, decanedioic acid 20Kg, borax 25Kg, benzoic acid 8Kg, benzotriazole 0.01Kg, glycerine 10Kg, water 60Kg, sodium carbonate are an amount of.
The preparation method: in the common response still, drop into triethanolamine, start to stir, after heating is warming up to 160 ℃ gradually, begin to add decanedioic acid, it was fully reacted 2 hours, during the control temperature make it be no more than 190 ℃.Slowly add borax then and constantly stir, rotating speed is at least 300 rev/mins, and the moisture that acidylates generation is removed, prevent towards the still pot phenomenon of overflowing, during temperature be controlled at 120 ℃～135 ℃ reactions 2 hours.Add benzoic acid again, temperature is controlled at 120 ℃～140 ℃, 1 hour reaction time, sampling detects viscosity with rotational viscosimeter, after after the viscosity of reactant reaches more than 60 centipoises/25 ℃, stopping reaction and allowing it naturally cool to below 80 ℃, add glycerine, stir fully the back and detect its pH value, pH value as product is lower than 7, promptly adjusts between its pH value to 7～10 with sodium carbonate.Add benzotriazole and water at last, discharging promptly got pressure testing liquid of the present invention after stirring and dissolving, temperature were reduced to room temperature.
Promptly sealing when using with security inspection in the pressure testing that above-mentioned pressure testing liquid is used to make the rolling mill laminar flow apparatus, is 1: 10～33 dilutions according to the ratio of pressure testing liquid and water.
The pressure testing liquid that present embodiment obtains has following performance, and the performance detection method is undertaken by SY1374-77:
Outward appearance: colourless or faint yellow
PH value: 7-10
Rust-preventing characteristic: (35 ± 2 ℃, RH 〉=95%) one-level grey cast iron
Monolithic: repeatedly seal, corrosion of nothing in 4 hours
Laminate patch: 24 hours, no variable color, corrosion
Corrosivity: (55 ± 2 ℃, complete immersion)
Steel disc: no change
Copper sheet: no change
Spumescence: (ml/10 minute) 0
Lubricity: PB (kilogram) 73
Embodiment two:
Composition of raw materials: triethanolamine 120Kg, dodecenylsuccinic acid 20Kg, boric acid 20Kg, Sodium Benzoate 10Kg, benzotriazole 0.01Kg, glycerine 10Kg, water 60Kg, sodium carbonate are an amount of.
The preparation method: in the common response still, drop into triethanolamine, start to stir, after heating is warming up to 140 ℃ gradually, begin to add dodecenylsuccinic acid, it was fully reacted 2.5 hours, during the control temperature be no more than 195 ℃.Slowly add boric acid then and constantly stir, the moisture that acidylates generation is removed, prevent towards the still pot phenomenon of overflowing, during temperature be controlled at 120 ℃～135 ℃ reactions 1.5 hours.Add benzoic acid again, temperature is controlled at 130 ℃～140 ℃, 1 hour reaction time, sampling detects viscosity with rotational viscosimeter, after after the viscosity of reactant reaches more than 60 centipoises/25 ℃, stopping reaction and allowing it naturally cool to below 80 ℃, add glycerine, stir fully the back and detect its pH value, pH value as product is lower than 7, promptly adjusts between its pH value to 7～10 with sodium carbonate.Add benzotriazole and water at last, stirring and dissolving, temperature are reduced to discharging after the room temperature.The pressure testing liquid performance sees Table 1.
Embodiment three:
Composition of raw materials: monoethanolamine 95Kg, oleic acid 25Kg, boric acid 20Kg, dibutyl phthalate 10Kg, benzotriazole 0.015Kg, polyvinyl alcohol (PVA) 25Kg, water 75Kg, sodium carbonate are an amount of.
The preparation method: in the common response still, drop into monoethanolamine, start to stir, after heating is warming up to 140 ℃ gradually, begin to add oleic acid, it was fully reacted 2 hours, during the control temperature be no more than 195 ℃.Slowly add boric acid then and constantly stir, the moisture that acidylates generation is removed, prevent towards the still pot phenomenon of overflowing, during temperature be controlled at 120 ℃～135 ℃, reacted 1.5 hours.Add dibutyl phthalate (reaction again, temperature is controlled at 120 ℃～140 ℃, 1 hour reaction time, sampling detects viscosity with rotational viscosimeter, after after the viscosity of reactant reaches more than 65 centipoises/25 ℃, stopping reaction and allowing it naturally cool to below 80 ℃, add polyvinyl alcohol (PVA), stir fully the back and detect its pH value, pH value as product is lower than 7, promptly adjusts between its pH value to 7～10 with sodium carbonate.Add benzotriazole and water at last, stirring and dissolving, temperature are reduced to discharging after the room temperature.The pressure testing liquid performance sees Table 1.
Embodiment four:
Composition of raw materials: diethylenetriamine 120Kg, lauric acid 20Kg, borax 20Kg, phthalic acid 10Kg, benzotriazole 0.022Kg, glycerine 10Kg, water 60Kg, sodium carbonate are an amount of.
The preparation method: in the common response still, drop into diethylenetriamine, start to stir, after heating is warming up to 140 ℃ gradually, begin to add lauric acid, it was fully reacted 2.5 hours, during the control temperature be no more than 195 ℃.Slowly add borax then and constantly stir, the moisture that acidylates generation is removed, prevent towards the still pot phenomenon of overflowing, during temperature be controlled at 120 ℃～135 ℃ reactions 2 hours.Add the O-phthalic acid reaction again, temperature is controlled at 120 ℃～140 ℃, 1 hour reaction time, sampling detects viscosity with rotational viscosimeter, after after the viscosity of reactant reaches more than 65 centipoises/25 ℃, stopping reaction and allowing it naturally cool to below 80 ℃, add glycerine, stir fully the back and detect its pH value, pH value as product is lower than 7, promptly adjusts between its pH value to 7～10 with sodium carbonate.Add benzotriazole and water at last, stirring and dissolving, temperature are reduced to discharging after the room temperature.The pressure testing liquid performance sees Table 1.
Embodiment five:
Composition of raw materials: decanedioic acid 4Kg, lauric acid 3Kg, diethanolamine 50Kg, boric acid 10.92Kg, Sodium Benzoate 5Kg, molecular weight are polyglycol 2Kg, propylene glycol 1Kg, glycerine 2Kg, water 22Kg, the benzotriazole 0.08Kg of 200-800.
To have diethanolamine to be warming up to 120 ℃, adding decanedioic acid, lauric acid reacted 2.5 hours; Then boric acid being joined in the above-mentioned reactant liquor, is to carry out acylation reaction 2 hours under 120 ℃ the condition in temperature; After reaction finishes, add Sodium Benzoate, 120 ℃～140 ℃, 1 hour reaction time, sampling detects viscosity with rotational viscosimeter, after stopping reaction allowing it naturally cool to below 80 ℃ after the viscosity of reactant reaching more than 65 centipoises/25 ℃, adds polyglycol, the third two liquor-saturated, glycerine fully stirs, adjust pH value to 7～10, add benzotriazole and obtain pressure testing liquid.The pressure testing liquid performance sees Table 1.
The performance of each pressure testing liquid of table 1
| Embodiment two | Embodiment three | Embodiment four | Embodiment five | |
| Outward appearance pH value rust-preventing characteristic anticorrosive property spumescence (ml/10 minute) lubricity PB (kilogram) | Red 8.0 qualified 0.5 65 | Yellow 8.5 qualified 1.5 75 | Red 8.0 qualified 0 70 | Red 8.0 qualified 0.5 68 |
To sum up, the raw materials for production cost of pressure testing liquid of the present invention is low, and toxicity is little, and the preparation method of pressure testing liquid of the present invention is simple simultaneously, and preparation equipment is not had specific (special) requirements.The pressure testing liquid that obtains is anti-to be embroidered, Corrosion Protection is good, and safe and reliable, for sealing and security inspection provide a kind of new selection.
Claims (7)
1. pressure testing liquid that is used for canister and pipeline, it is characterized in that: by general assembly (TW) is 100 parts, is formed by following feedstock production:
C8～4～10 parts of C18 higher fatty acid, 30～55 parts of organic amines, boric acid and/or 7～14 parts of borates, aromatic carboxylic acid or its salt or 2.5～10 parts in derivant, 3～11 parts of polyvalent alcohols, 15～30 parts in water, benzotriazole 0.001-0.1 part, wherein said aromatic carboxylic acid or its salt or derivant are: benzoic acid or phthalic acid or salt of the two or derivant;
Its preparation method comprises the steps:
(1) organic amine is warming up to 120 ℃～195 ℃, adds C8～C18 higher fatty acid and react;
(2) then boric acid and/or borate being joined in the above-mentioned reactant liquor, is to carry out acylation reaction under 120 ℃～165 ℃ the condition in temperature;
(3) after above-mentioned reaction finishes, add aromatic carboxylic acid or its salt or derivant, temperature is controlled at 120 ℃～140 ℃, and the viscosity for the treatment of product reaches more than 60 centipoises/25 ℃, stops reaction, is cooled to below 80 ℃;
(4) add polyvalent alcohol then, stir, adjust pH value to 7～10, add benzotriazole and water and obtain pressure testing liquid.
2. the pressure testing liquid that is used for canister and pipeline as claimed in claim 1 is characterized in that: described C8～C1 8 higher fatty acid are the one or more combination in dodecenylsuccinic acid, decanedioic acid, lauric acid, stearic acid, the oleic acid.
3. the pressure testing liquid that is used for canister and pipeline as claimed in claim 1 is characterized in that: described organic amine is vinyl amine derivative or monoethanolamine, diethanolamine, triethanolamine.
4. the pressure testing liquid that is used for canister and pipeline as claimed in claim 3 is characterized in that: described vinyl amine derivative is ethylenediamine or diethylenetriamine.
5. the pressure testing liquid that is used for canister and pipeline as claimed in claim 1 is characterized in that: described polyvalent alcohol is one or more the combination in polyglycol, propylene glycol, glycerine, diglycol, glycerine, triethylene glycol, ethylene glycol, the polyvinyl alcohol (PVA).
6. one kind prepares the described method that is used for the pressure testing liquid of canister and pipeline of claim 1, comprises the steps:
(1) organic amine is warming up to 120 ℃～195 ℃, adds C8～C18 higher fatty acid and react;
(2) then boric acid and/or borate being joined in the above-mentioned reactant liquor, is to carry out acylation reaction under 120 ℃～165 ℃ the condition in temperature;
(3) after above-mentioned reaction finishes, add aromatic carboxylic acid or its salt or derivant, temperature is controlled at 120 ℃～140 ℃, and the viscosity for the treatment of product reaches more than 60 centipoises/25 ℃, stops reaction, is cooled to below 80 ℃;
(4) add polyvalent alcohol then, stir, adjust pH value to 7～10, add benzotriazole and water and obtain pressure testing liquid.
7. the preparation method who is used for the pressure testing liquid of canister and pipeline as claimed in claim 6 is characterized in that: the reaction time in the step (1) is 2～2.5 hours; The reaction time of step (2) was controlled at 1.5～2 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100209751A CN100374840C (en) | 2005-05-26 | 2005-05-26 | Pressure testing liquid for metal container and conduit and preparation process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100209751A CN100374840C (en) | 2005-05-26 | 2005-05-26 | Pressure testing liquid for metal container and conduit and preparation process thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1699949A CN1699949A (en) | 2005-11-23 |
| CN100374840C true CN100374840C (en) | 2008-03-12 |
Family
ID=35476101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100209751A Active CN100374840C (en) | 2005-05-26 | 2005-05-26 | Pressure testing liquid for metal container and conduit and preparation process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100374840C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103450754A (en) * | 2013-08-23 | 2013-12-18 | 吴江龙硕金属制品有限公司 | Metal antirust emulsion and preparation method thereof |
| CN105043679A (en) * | 2015-06-02 | 2015-11-11 | 重庆建设摩托车股份有限公司 | Method for carrying out airtightness detection and antitrust processing synchronously on fuel tank production line |
| CN110201870A (en) * | 2019-07-10 | 2019-09-06 | 陕西宝光真空电器股份有限公司 | A kind of electromagnetic pure iron part and preparation method thereof with transparent water-soluble protecting film |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002080876A (en) * | 2000-06-29 | 2002-03-22 | Bridgestone Corp | Lubricant composition for steel filament, steel filament treated therewith, and rubber/steel filament composite |
| CN1351105A (en) * | 2000-10-30 | 2002-05-29 | 中国人民解放军海军工程大学 | Corrosion inhibitor for cooling liquid of IC engine |
| CN1445344A (en) * | 2003-03-24 | 2003-10-01 | 营口三球特种油品有限公司 | Brake fluid for motor vehicles and its production methods |
| US20030220205A1 (en) * | 2002-05-23 | 2003-11-27 | Manka John S. | Emulsified based lubricants |
-
2005
- 2005-05-26 CN CNB2005100209751A patent/CN100374840C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002080876A (en) * | 2000-06-29 | 2002-03-22 | Bridgestone Corp | Lubricant composition for steel filament, steel filament treated therewith, and rubber/steel filament composite |
| CN1351105A (en) * | 2000-10-30 | 2002-05-29 | 中国人民解放军海军工程大学 | Corrosion inhibitor for cooling liquid of IC engine |
| US20030220205A1 (en) * | 2002-05-23 | 2003-11-27 | Manka John S. | Emulsified based lubricants |
| CN1445344A (en) * | 2003-03-24 | 2003-10-01 | 营口三球特种油品有限公司 | Brake fluid for motor vehicles and its production methods |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1699949A (en) | 2005-11-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104403773B (en) | A kind of hydraulic oil | |
| CN100374840C (en) | Pressure testing liquid for metal container and conduit and preparation process thereof | |
| CN104277902A (en) | Heavy-load metal machining total synthesis cutting fluid as well as preparation method and application thereof | |
| CN105602689A (en) | Environmentally-friendly and degradable water-based fully-synthetic cutting fluid and preparation method thereof | |
| KR102086329B1 (en) | Novel vapor space anticorrosive composition | |
| CN107502437B (en) | Semi-synthetic water-soluble cutting fluid for stainless steel and preparation method thereof | |
| CN104164295A (en) | Cutting working fluid of numerically controlled line-cutting machine, and preparation method thereof | |
| CN115521825B (en) | Water-based stamping liquid and preparation method and application thereof | |
| CN102010782A (en) | Flame-resistant hydraulic fluid composition and preparation method thereof | |
| CN101012563A (en) | Water-based long-acting antirust agent | |
| EP0913384A2 (en) | New water soluble C22 tricarboxylic acid amine salts and their use as a water soluble corrosion inhibitors | |
| US5174913A (en) | Polybasic acid esters as oil field corrosion inhibitors | |
| CN106433863A (en) | Water-based cutting fluid used for metal processing, and preparation method thereof | |
| CN112481009B (en) | Microemulsion cutting fluid for copper-aluminum-iron material processing and preparation method thereof | |
| CN101381170A (en) | Corrosion inhibitor of internal combustion engine cooling liquid and production process | |
| CN103589489B (en) | environment-friendly water-based cutting fluid | |
| CN113563958A (en) | Cutting cooling liquid applied to 7-series aviation aluminum material processing, preparation method and use method thereof | |
| CN104911578A (en) | Green environment-friendly aqueous rust inhibitor and preparation method thereof | |
| CN115678659B (en) | Recycling method of metal water-based product and metal water-based product combination | |
| CN109504513B (en) | Water-soluble stainless steel seamless steel pipe cold rolling liquid and preparation method thereof | |
| CN102746933B (en) | A kind of preparation method of environment-friendlyantirust antirust water-based cutting fluid | |
| CN106756941A (en) | A kind of water base brass antioxidant of high corrosion-resistant for adding Ludox and preparation method thereof | |
| CN102766872A (en) | Compound corrosion inhibitor, and application thereof | |
| CN111763557A (en) | Environment-friendly microemulsion and preparation method and application thereof | |
| CN103451000A (en) | Completely-synthesized cutting fluid for automobile brake disc and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: DUAL GROUP (DEYANG) HEAVY EQUIPMENT CORP. Free format text: FORMER OWNER: CHINA SECOND HEAVY MACHINERY GROUP CO Effective date: 20071102 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20071102 Address after: 618013 No. 460 Zhujiang West Road, Sichuan, Deyang Applicant after: Erzhong Group Deyang Heavy Equipment Co., Ltd. Address before: 618013 No. 1, Zhujianglu Road, Sichuan, Deyang Applicant before: China Second Heavy Machinery Group Co |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180327 Address after: 618013 Deyang Pearl River West Road, Sichuan, No. 460 Patentee after: Double (Deyang) heavy equipment Co., Ltd. Address before: 618013 Deyang Pearl River West Road, Sichuan, No. 460 Patentee before: Erzhong Group (Deyang) Heavy Equipment Co., Ltd. |
|
| TR01 | Transfer of patent right |