CN115747816B - Application of glycol ether in cleaning of active metal, non-water-based cleaning agent and cleaning method of active metal - Google Patents
Application of glycol ether in cleaning of active metal, non-water-based cleaning agent and cleaning method of active metal Download PDFInfo
- Publication number
- CN115747816B CN115747816B CN202211547196.7A CN202211547196A CN115747816B CN 115747816 B CN115747816 B CN 115747816B CN 202211547196 A CN202211547196 A CN 202211547196A CN 115747816 B CN115747816 B CN 115747816B
- Authority
- CN
- China
- Prior art keywords
- cleaning
- cleaning agent
- active metal
- glycol ether
- water
- 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
- Detergent Compositions (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention belongs to the technical field of metal cleaning products, and particularly relates to application of glycol ether in cleaning of active metals, a non-water-based cleaning agent and a cleaning method of the active metals. The invention uses glycol ether as cleaning agent in the field of active metal cleaning, the glycol ether has amphipathy, can be mixed with water and halohydrocarbon, can well remove cutting cooling liquid, greasy dirt and dust remained on the surface of metal, does not react with active metal, and has the advantages of nonflammability, safety and environmental protection. The invention firstly washes out the cutting cooling liquid by using glycol ether, the glycol ether can be mutually dissolved with the halogenated hydrocarbon cleaning agent, then washes out greasy dirt and glycol ether residues by using the halogenated hydrocarbon cleaning agent, and the halogenated hydrocarbon cleaning agent has the advantages of flame retardance and volatility, and can enable the surface of the active metal to be quickly dried without residues.
Description
Technical Field
The invention belongs to the technical field of metal cleaning products, and particularly relates to application of glycol ether in cleaning of active metals, a non-water-based cleaning agent and a cleaning method of the active metals.
Background
The active metal means a metal that is susceptible to chemical reactions, such as alkali metals, alkaline earth metals, lanthanoid metals, actinoid metals, and the like.
The surface of the active metal is stained with pollutants such as cutting cooling liquid, engine oil and the like in the machining engineering, and the pollutants on the surface of the active metal need to be cleaned before entering the subsequent process. Because the chemical nature of the active metal is active, strict requirements are set for the selection of the cleaning agent: firstly, the reaction with the active metal cannot occur; secondly, the material is not easy to burn and has stable chemical property; again, the utility model is safe and environment-friendly, and is harmless to human body.
Currently, the metal cleaning agents in the prior art mainly comprise water-based cleaning agents and solvent-type cleaning agents. The main body of the water-based cleaning agent is water, and is matched with inorganic or organic auxiliary agents, for example, chinese patent CN103469228A discloses an environment-friendly water-based metal cleaning agent which consists of anionic surfactant, nonionic surfactant, inorganic alkali, builder, corrosion inhibitor, glycol and water, but the cleaning effect of the water-based cleaning agent on greasy dirt is not good, heating and ultrasonic are often needed, the problem of cleaning agent residue exists, and deionized water is needed to rinse the cleaning agent for multiple times later. In addition, water-based cleaners and cleaning processes may cause problems such as corrosion and oxidation to the active metal materials and are not suitable for cleaning the active metals. The solvent cleaning agent mainly comprises hydrocarbon cleaning agent and halogenated hydrocarbon cleaning agent. The hydrocarbon cleaning agent (for example, a solvent type environment-friendly cleaning agent disclosed in Chinese patent CN 101684437A) is petroleum hydrocarbon, and has the risk of inflammability and explosiveness, and in addition, the hydrocarbon cleaning agent has a slow volatilization rate and is easy to remain on the metal surface. The halogenated hydrocarbon cleaning agent (for example, chinese patent CN104278286A discloses cleaning of an aircraft preservative) is mainly micromolecular fluorinated or chlorinated alkane, and has the advantages of good cleaning performance, flame retardance, easy volatilization, low residue and the like. However, hydrocarbon cleaning agents and halogenated hydrocarbon cleaning agents are oily cleaning agents, and cannot wash off the residual aqueous cutting coolant on the metal surface well. In addition, polar small molecule solvents such as ethanol, acetone and the like have good cleaning effect, but are extremely easy to burn and unsafe to use. Therefore, it is required to develop a cleaning agent which can be applied to an active metal.
Disclosure of Invention
In view of the above, the present invention aims to provide an application of glycol ether in cleaning of active metals, a non-aqueous cleaning agent and a cleaning method of active metals. The glycol ether has amphipathy, can well remove the residual cutting coolant, greasy dirt and dust on the metal surface, and does not react with the active metal, and meanwhile has the advantages of nonflammability, safety and environmental protection, and can be used for cleaning the active metal.
In order to achieve the above object, the present invention provides the following technical solutions:
The invention provides an application of glycol ether in cleaning of active metals.
Preferably, the glycol ether comprises one or more of ethylene glycol methyl ether, diethylene glycol ethyl ether, diethylene glycol butyl ether, triethylene glycol methyl ether, triethylene glycol ethyl ether, triethylene glycol butyl ether and tetraethylene glycol methyl ether.
The invention also provides a non-water-based cleaning agent, which comprises the following components in percentage by mass: 98.5-100% of glycol ether and 0-1.5% of auxiliary agent, wherein the auxiliary agent comprises corrosion inhibitor and/or antioxidant, and the mass fraction of the auxiliary agent is not 0.
Preferably, the mass fraction of the corrosion inhibitor in the non-water-based cleaning agent is 0-1%, and the mass fraction of the corrosion inhibitor is not 0.
Preferably, the corrosion inhibitor comprises hexadecylamine and/or sodium ethylenediamine tetraacetate.
Preferably, the mass fraction of the antioxidant in the non-water-based cleaning agent is 0-0.5%, and the mass fraction of the antioxidant is not 0.
Preferably, the antioxidant comprises 2, 6-di-tert-butyl-p-cresol.
The invention also provides a cleaning method of the active metal, which comprises the following steps: and placing the active metal sample to be cleaned in a non-water-based cleaning agent and a halogenated hydrocarbon cleaning agent in sequence for cleaning, wherein the non-water-based cleaning agent is the non-water-based cleaning agent according to the technical scheme.
Preferably, the cleaning mode is rinsing, and the rinsing time is independently 5-30 s.
Preferably, the halogenated hydrocarbon cleaning agent comprises dichloromethane or trichloroethylene.
The invention uses glycol ether as cleaning agent in the field of cleaning active metal, the glycol ether has amphipathy, can be mixed with water and halohydrocarbon, can well remove cutting cooling liquid, greasy dirt and dust remained on the surface of metal, does not react with active metal, has the advantages of nonflammability, safety and environmental protection, and can be used for cleaning active metal.
The invention also provides a non-water-based cleaning agent which has good cleaning effect on metals, and the addition of the corrosion inhibitor and the antioxidant can further slow down the corrosion on active metals.
The invention also provides a cleaning method of the active metal, which comprises the following steps of cleaning in a non-water-based cleaning agent and a halogenated hydrocarbon cleaning agent in sequence: the cutting cooling liquid is washed off by glycol ether, and then greasy dirt and glycol ether residues are washed off by using halogenated hydrocarbon cleaning agent. The non-water-based cleaning agent is based on glycol ether, is an amphiphilic substance, can be mutually dissolved with water, can well wash off water-based cutting cooling liquid on the surface of active metal, and has high flash point, is nonflammable and does not react with the active metal. In addition, glycol ether can be mutually dissolved with halogenated hydrocarbon cleaning agent, and after the cleaning of glycol ether, the halogenated hydrocarbon cleaning agent is added for cleaning, so that the greasy dirt and residual glycol ether cleaning agent on the metal surface can be removed. Because the halogenated hydrocarbon cleaning agent has the advantages of flame retardance and volatility, the surface of the active metal can be quickly dried without residue, the cleaning time is shortened, and the working efficiency is improved.
The cleaning agent formula and the cleaning method can effectively remove the cutting cooling liquid, greasy dirt, dust and the like remained on the surface of the active metal, and have no cleaning agent residue. The cleaning method solves the problem that the cutting cooling liquid (generally water-based) and oil stain substances with opposite properties are difficult to remove simultaneously at present.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram showing a cleaning method and a cleaning effect test mode according to the present invention.
Detailed Description
The invention provides an application of glycol ether in cleaning of active metals.
In the present invention, the glycol ether preferably includes one or more of ethylene glycol methyl ether, diethylene glycol ethyl ether, diethylene glycol butyl ether, triethylene glycol methyl ether, triethylene glycol ethyl ether, triethylene glycol butyl ether, and tetraethylene glycol methyl ether.
In the present invention, materials and equipment used are commercially available in the art unless otherwise specified.
In the present invention, the ethylene glycol methyl ether is preferably ethylene glycol monomethyl ether.
In the present invention, the diethylene glycol methyl ether preferably includes diethylene glycol monomethyl ether or diethylene glycol dimethyl ether.
In the present invention, the diethylene glycol diethyl ether preferably includes diethylene glycol monoethyl ether or diethylene glycol diethyl ether.
In the present invention, the diethylene glycol butyl ether is preferably diethylene glycol monobutyl ether.
In the present invention, the triethylene glycol methyl ether preferably includes triethylene glycol monomethyl ether or triethylene glycol dimethyl ether.
In the present invention, the triethylene glycol diethyl ether is preferably triethylene glycol monoethyl ether.
In the present invention, the triethylene glycol butyl ether is preferably triethylene glycol monobutyl ether.
In the present invention, the tetraethylene glycol monomethyl ether is preferably tetraethylene glycol monomethyl ether.
In the present invention, the active metal preferably includes an alkali metal, an alkaline earth metal, a lanthanide metal, or an actinide metal, and in the specific embodiment of the present invention, corrosion protection and passivation must be performed when iron is washed, so metallic iron is selected for the experiment.
In the invention, the glycol ether is applied to the field of active metal cleaning as a cleaning agent.
The invention also provides a non-water-based cleaning agent, which comprises the following components in percentage by mass: 98.5-100% of glycol ether and 0-1.5% of auxiliary agent, wherein the auxiliary agent comprises corrosion inhibitor and/or antioxidant, and the mass fraction of the auxiliary agent is not 0.
In the present invention, the mass fraction of the corrosion inhibitor in the non-aqueous cleaning agent is preferably 0 to 1%, and the mass fraction of the corrosion inhibitor is preferably not 0.
In the present invention, the corrosion inhibitor preferably includes hexadecylamine and/or sodium ethylenediamine tetraacetate, and when the corrosion inhibitor preferably includes hexadecylamine and sodium ethylenediamine tetraacetate, the mass ratio of hexadecylamine and sodium ethylenediamine tetraacetate is not required in the present invention.
In the present invention, the mass fraction of the antioxidant in the nonaqueous base cleaning agent is preferably 0 to 0.5%, and the mass fraction of the antioxidant is preferably not 0.
In the present invention, the antioxidant preferably includes 2, 6-di-t-butyl-p-cresol.
In the present invention, when the auxiliary agent preferably includes a corrosion inhibitor and an antioxidant, the present invention does not require the mass ratio of the antioxidant and the corrosion inhibitor.
The non-water-based cleaning agent disclosed by the invention does not contain substances harmful to the environment and human bodies, is environment-friendly, safe and stable in physical and chemical properties, high in flash point, safe to use and store, and has the advantages of nonflammability, safety and environment friendliness.
The preparation method of the non-water-based cleaning agent has no special requirement, glycol ether and the auxiliary agent are uniformly mixed, the mixing temperature is preferably room temperature, the mixing mode is preferably stirring, the stirring rotating speed is preferably 800rpm, and the time is preferably 10 minutes.
The invention also provides a cleaning method of the active metal, which comprises the following steps: and placing the active metal sample to be cleaned in a non-water-based cleaning agent and a halogenated hydrocarbon cleaning agent in sequence for cleaning, wherein the non-water-based cleaning agent is the non-water-based cleaning agent according to the technical scheme.
In the present invention, the washing mode is preferably rinsing, and the rinsing time is independently preferably 5 to 30 seconds, more preferably 10 to 20 seconds.
In the present invention, the halogenated hydrocarbon cleaning agent preferably includes methylene chloride or trichloroethylene.
The invention has no special requirement on the dosage of the non-water-based cleaning agent and the halogenated hydrocarbon cleaning agent, and the active metal sample to be cleaned is immersed.
In the present invention, the number of times of washing in the non-aqueous based detergent is preferably 1, and the number of times of washing in the halogenated hydrocarbon detergent is preferably 1 to 2.
In the invention, the cleaning is preferably followed by drying, the drying mode is preferably air drying, the temperature is preferably room temperature, and the time is preferably 10-20 min, and the drying function is to volatilize the halogenated hydrocarbon cleaning agent, realize quick drying and improve the cleaning efficiency.
For further explanation of the present invention, the application of the glycol ether in cleaning of active metals, the non-aqueous cleaning agent and the cleaning method of active metals provided in the present invention will be described in detail with reference to the accompanying drawings and examples, but they should not be construed as limiting the scope of the present invention.
Example 1
1. 1G of iron wire cuttings (with the diameter of about 1-5 mm) sample is weighed, placed in 25mL of cutting cooling liquid (aqueous solution with the mass concentration of triethanolamine being 0.5% and the mass concentration of sodium nitrite being 1%) for soaking for 2min, taken out and placed in 25mL of guide rail oil (32#) for soaking for 10s, and taken out to obtain the sample to be cleaned.
2. And (3) putting the sample to be cleaned in 25mL of glycol ether for rinsing for 20s, putting the sample into 25mL of halogenated hydrocarbon cleaning agent for rinsing for 20s, taking out, and airing for 10min to obtain the aired sample.
3. The dried sample was immersed in 30mL of ultrapure water for 10 minutes, and the ion concentration and the conductivity of the immersed aqueous solution were measured with a pure water test pen to reflect the cleaning effect of the cutting cooling liquid (cutting liquid).
4. And (3) adding the dried sample (which is additionally operated according to the steps 1-2) into 20mL of Dichloromethane (DCM) for soaking for 10min, and detecting the residual quantity of the guide rail oil by an ultraviolet-visible spectrophotometer for reflecting the cleaning effect of the greasy dirt.
FIG. 1 is a diagram showing a cleaning method and a cleaning effect test mode according to the present invention.
The glycol ether and halogenated hydrocarbon cleaning agent in the step 2 are triethylene glycol monomethyl ether-dichloromethane, diethylene glycol monomethyl ether-dichloromethane, triethylene glycol dimethyl ether-dichloromethane, diethylene glycol dimethyl ether-dichloromethane and diethylene glycol dimethyl ether-trichloroethylene respectively; the blank group is the test result of the sample to be cleaned (not cleaned) in the step 1, the control group is the test result of the sample to be cleaned in the step 1 after being rinsed with ethanol as a cleaning agent for 20s and dried, and the cleaning effect is shown in table 1.
Table 1 cleaning effect
As can be seen from table 1, the concentration and conductivity of the ions remained after the cleaning with glycol ether and halogenated hydrocarbon cleaning agents are all close to 0, indicating that the cutting coolant is cleaned; the residual concentration and the residual quantity of the guide rail oil are greatly reduced compared with those of a blank group and a control group, which shows that the cleaning method of the invention has the optimal cleaning effect on the guide rail oil and can well clean and remove the greasy dirt on the metal surface.
While the foregoing embodiments have been described in some, but not all embodiments of the invention, other embodiments of the invention can be made and still fall within the scope of the invention without undue effort.
Claims (7)
1. The method for cleaning the active metal is characterized by comprising the following steps of:
sequentially placing the active metal sample to be cleaned in a non-water-based cleaning agent and a halogenated hydrocarbon cleaning agent for cleaning;
The non-water-based cleaning agent comprises the following components in percentage by mass: 98.5-100% of glycol ether and 0-1.5% of auxiliary agent, wherein the auxiliary agent comprises a corrosion inhibitor and/or an antioxidant, and the mass fraction of the auxiliary agent is not 0.
2. The cleaning method according to claim 1, wherein the non-aqueous cleaning agent comprises 0-1% by mass of a corrosion inhibitor, and the corrosion inhibitor is not 0% by mass.
3. The cleaning method according to claim 1 or 2, wherein the corrosion inhibitor comprises hexadecylamine and/or sodium ethylenediamine tetraacetate.
4. The cleaning method according to claim 1, wherein the non-aqueous cleaning agent contains 0 to 0.5% by mass of an antioxidant, and the antioxidant is not contained in an amount of 0% by mass.
5. The cleaning method of claim 1 or 4, wherein the antioxidant comprises 2, 6-di-t-butyl-p-cresol.
6. The method according to claim 1, wherein the cleaning is performed by rinsing, and the rinsing time is independently 5 to 30 seconds.
7. The cleaning method according to claim 6, wherein the halogenated hydrocarbon cleaning agent comprises methylene chloride or trichloroethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211547196.7A CN115747816B (en) | 2022-12-05 | 2022-12-05 | Application of glycol ether in cleaning of active metal, non-water-based cleaning agent and cleaning method of active metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211547196.7A CN115747816B (en) | 2022-12-05 | 2022-12-05 | Application of glycol ether in cleaning of active metal, non-water-based cleaning agent and cleaning method of active metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115747816A CN115747816A (en) | 2023-03-07 |
| CN115747816B true CN115747816B (en) | 2024-06-18 |
Family
ID=85343363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211547196.7A Active CN115747816B (en) | 2022-12-05 | 2022-12-05 | Application of glycol ether in cleaning of active metal, non-water-based cleaning agent and cleaning method of active metal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115747816B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115896800A (en) * | 2022-12-05 | 2023-04-04 | 中国工程物理研究院材料研究所 | Cleaning agent and application and recovery method thereof in metal cleaning |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4060496A (en) * | 1976-04-29 | 1977-11-29 | Burnishine Products Inc. | Stainless steel cleaner |
| US5604196A (en) * | 1990-11-15 | 1997-02-18 | Lockheed Corporation | Nonflammable mild odor solvent cleaner with (m)ethyl lactate and propylene glycol propyl ether |
| JPH05271693A (en) * | 1992-03-24 | 1993-10-19 | Asahi Chem Ind Co Ltd | Detergent |
| JPH06192694A (en) * | 1992-10-09 | 1994-07-12 | Matsushita Electric Ind Co Ltd | Detergent for removal of soldering flux |
| JPH0797596A (en) * | 1993-09-29 | 1995-04-11 | Arakawa Chem Ind Co Ltd | Nonhalogen-based detergent |
| JP2003073692A (en) * | 2001-08-31 | 2003-03-12 | Showa Denko Kk | Detergent composition and cleaning method using the same |
| JP2003277961A (en) * | 2002-03-20 | 2003-10-02 | Kobe Steel Ltd | Method for working metallic material |
| US6699829B2 (en) * | 2002-06-07 | 2004-03-02 | Kyzen Corporation | Cleaning compositions containing dichloroethylene and six carbon alkoxy substituted perfluoro compounds |
| CN101339368A (en) * | 2007-07-06 | 2009-01-07 | 安集微电子（上海）有限公司 | Photoresist cleaning agent |
| KR20120072431A (en) * | 2010-12-24 | 2012-07-04 | 주식회사 이디크린 | Cleaner for metal |
| JP6056345B2 (en) * | 2011-11-25 | 2017-01-11 | 東ソー株式会社 | Cleaning composition and cleaning method using the same |
| CN103160394B (en) * | 2013-04-03 | 2014-08-06 | 东莞市剑鑫电子材料有限公司 | Oil stain cleaning agent and preparation method thereof |
| JP6098472B2 (en) * | 2013-10-23 | 2017-03-22 | 東亞合成株式会社 | Washing soap |
| CN105177615A (en) * | 2015-10-30 | 2015-12-23 | 深圳市辛骏翔科技有限公司 | Metal cleaner |
| CN107916429A (en) * | 2017-10-25 | 2018-04-17 | 成都圻坊生物科技有限公司 | Environment-friendly metal antirust high-efficiency water-base cleaning agent |
| CN108865523A (en) * | 2018-08-03 | 2018-11-23 | 天津普罗米新材料有限公司 | A kind of safety and environmental protection agent for carbon hydrogen detergent |
| CN111549351B (en) * | 2020-06-15 | 2022-09-02 | 南通科星化工股份有限公司 | High-cleaning-ability environment-friendly metal surface oil stain cleaning agent and preparation method thereof |
-
2022
- 2022-12-05 CN CN202211547196.7A patent/CN115747816B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115896800A (en) * | 2022-12-05 | 2023-04-04 | 中国工程物理研究院材料研究所 | Cleaning agent and application and recovery method thereof in metal cleaning |
Non-Patent Citations (3)
| Title |
|---|
| 氯化溶剂型清洗剂中缓蚀剂的应用初探;邓舜扬;;腐蚀与防护;19880415(第02期);第24页第1段第1-6行 * |
| 用于清洗行业的低气味醇醚溶剂;陈伟;;中国洗涤用品工业;20130315(第03期);第40页"2.1 醇醚溶剂的分类"、第41-42页"4. 醇醚溶剂在清洗行业中的应用" * |
| 陈伟 ; .用于清洗行业的低气味醇醚溶剂.中国洗涤用品工业.2013,(第03期),第40页"2.1 醇醚溶剂的分类"、第41-42页"4. 醇醚溶剂在清洗行业中的应用". * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115747816A (en) | 2023-03-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106893642B (en) | Water-based cleaning agent and application thereof | |
| CN106398374B (en) | The preparation method of the de-inking method of glass pieces and used aqueous deinking agent and the aqueous deinking agent | |
| CN110067001B (en) | Metal cleaning agent and preparation method thereof | |
| CN1044265C (en) | Detergent comprising composite components and cleaning method using such detergent | |
| JP3086254B2 (en) | Formulations for cleaning electronic and electrical assemblies | |
| CN112522037A (en) | Neutral water-based cleaning agent for cleaning PCB and preparation method thereof | |
| CN106479761B (en) | Printed circuit board waterborne cleaning agent composition and cleaning agent and its preparation method and application | |
| CN109370809B (en) | Low-foam water-based cleaning agent and cleaning method | |
| JPH03227400A (en) | Detergent for washing rosin-based soldering flux and washing method of same flux | |
| CN115747816B (en) | Application of glycol ether in cleaning of active metal, non-water-based cleaning agent and cleaning method of active metal | |
| JP2012084917A (en) | Gluconic acid containing photoresist cleaning composition for multi-metal device processing | |
| CN103194318A (en) | Environment-friendly cleaning agent | |
| CN102051283A (en) | Hydroxylamine-containing cleaning solution and use thereof | |
| CN115896800A (en) | Cleaning agent and application and recovery method thereof in metal cleaning | |
| JP4767002B2 (en) | Pre-cleaning method and cleaning device | |
| JP3246694B2 (en) | How to wash goods | |
| US5034148A (en) | Cleansing compositions | |
| CN109401859B (en) | Water-based cleaning agent for rosin type soldering flux and cleaning method | |
| EP0523892B1 (en) | Cleaning compositions | |
| JPH06254519A (en) | Alcohol-based detergent | |
| JPH08283972A (en) | Additive for water based cleaning solution and a method for preventing discoloration and elution of metal using the same | |
| JP3375097B2 (en) | How to wash goods | |
| JPH0649498A (en) | Detergent composition | |
| CN119592123A (en) | Alkaline paint remover and preparation method and application thereof | |
| CN115926515A (en) | Strippable membrane detergent and application method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |