CN114470882B - Solid degassing agent for concrete and preparation method thereof - Google Patents
Solid degassing agent for concrete and preparation method thereof Download PDFInfo
- Publication number
- CN114470882B CN114470882B CN202210109986.0A CN202210109986A CN114470882B CN 114470882 B CN114470882 B CN 114470882B CN 202210109986 A CN202210109986 A CN 202210109986A CN 114470882 B CN114470882 B CN 114470882B
- Authority
- CN
- China
- Prior art keywords
- concrete
- polyoxyethylene polyoxypropylene
- fatty alcohol
- alcohol polyoxyethylene
- polyoxypropylene ether
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
- B01D19/0409—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance compounds containing Si-atoms
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The application discloses a solid degassing agent for concrete and a preparation method thereof, wherein the degassing agent consists of 40-60% of a carrier, 10-30% of fatty alcohol polyoxyethylene polyoxypropylene ether fatty acid ester, 10-30% of polyether modified polysiloxane and 5-15% of fatty alcohol polyoxyethylene polyoxypropylene ether carboxylate. This application is through using fatty alcohol polyoxyethylene polyoxypropylene ether fatty acid ester and polyether modification polyorganosiloxane as defoaming substance, introduce the fatty alcohol polyoxyethylene polyoxypropylene ether carboxylate of specific structure for it has defoaming reinforcing effect in the concrete, can improve the compatibility between two kinds of defoaming substances of fatty alcohol polyoxyethylene polyoxypropylene ether fatty acid ester, polyether modification polyorganosiloxane and other additives of concrete simultaneously, this product has good compatibility and defoaming performance.
Description
Technical Field
The invention belongs to the technical field of additives for concrete, and relates to a solid degassing agent for concrete and a preparation method thereof.
Background
In order to improve the quality of concrete, various cement additives, such as air-entraining agents and water-reducing agents, are often used. The air entraining agent is used to introduce air bubbles into concrete to improve the flowability of unhardened concrete, improve the workability during construction and the frost resistance of hardened concrete. The water reducing agent can improve the fluidity of concrete and reduce the water content of the concrete, and the reduction of the water content can improve the strength of the concrete. However, if the amount of air introduced into the concrete is increased, coarse air bubbles are likely to be generated, resulting in uneven filling and a decrease in the strength of the concrete, and voids are formed on the surface of the hardened concrete, thereby deteriorating the appearance. Therefore, concrete is often supplemented with a deaerator or defoamer to reduce internal air bubbles in the concrete.
The air-entraining agent is often insoluble in water, while other additives in the concrete, such as air-entraining agents and water-reducing agents, are soluble in water, so that the air-entraining agent separates over time, resulting in fluctuations in the air content inside the concrete. While compatibility in concrete can be improved by increasing the hydrophilicity of the air release agent, the ability to eliminate coarse air bubbles is diminished.
CN201980024049 discloses a defoaming agent composed of a polyoxyalkylene compound and a phosphate compound, which can achieve both defoaming property and compatibility in concrete, and can produce concrete with less coarse bubbles on the surface and beautiful surface. There is still room for improvement in defoaming performance.
CN108164181A discloses a concrete defoamer, which is composed of fatty alcohol polyoxyethylene ether phosphate, random polyether, an emulsifier, a wetting agent, a thickener, a compounding agent and water, wherein the chemical stability of the defoamer is improved by introducing the fatty alcohol polyoxyethylene ether phosphate. There is still room for improvement in defoaming performance.
CN110272222B discloses a solid defoaming agent for self-leveling mortar, which utilizes high-carbon alcohol to carry out high-temperature treatment on white carbon black, improves the defoaming capability of the defoaming agent on the surface of a self-leveling mortar system, utilizes the high-carbon alcohol to spray a carrier, improves the storage stability of the defoaming agent, and increases the degassing performance of the defoaming agent. The preparation process is complex.
CN107117851B discloses an oil well cement powder defoaming agent, which consists of hydrophilic white carbon black, hydrophobic white carbon black, polar solvent, polyether and mineral oil, and the preparation method comprises the following steps: (1) Mixing the first part of hydrophobic white carbon black with mineral oil to obtain an intermediate E; (2) Mixing the second part of hydrophobic white carbon black with polyether to obtain an intermediate F; (3) mixing the intermediate E with hydrophilic white carbon black to obtain a mixture G; (4) Adding a polar solvent into the mixture G, and uniformly mixing to obtain a mixture H; (5) And adding the intermediate F into the mixture H, mixing to obtain a mixture I, and finally screening the mixture I to obtain the powder defoaming agent. The preparation process is complex.
CN103172297B discloses a water-soluble silicone having at least two different polyalkyleneoxy moieties, which has good compatibility with superplasticizers for concrete and good defoaming properties. The compatibility with other additives of concrete is improved by increasing the water solubility of the polysiloxane, and the defoaming performance of the polysiloxane is usually insufficient.
CN102961896B discloses a powder defoamer taking fly ash hollow glass beads as a filler, defoaming active substances of the powder defoamer are organic siloxane and hydrophobic white carbon black, an emulsifier is a nonionic silicon polyether emulsifier, and the filler is the fly ash hollow glass beads. The preparation method comprises the steps of preparing silicone grease from the organopolysiloxane and the hydrophobic white carbon black at a high temperature, and uniformly stirring and mixing the obtained silicone grease with the emulsifier and the fly ash hollow glass beads to prepare the powder defoaming agent. The defoaming agent can be applied to concrete defoaming. The product of the invention has simple preparation process and excellent defoaming performance, but the compatibility of polysiloxane and concrete is poor.
Disclosure of Invention
Aiming at the defects in the prior art, the technical problem to be solved by the application is to provide the solid degassing agent for the concrete, which has a defoaming enhancement effect in the concrete and can improve the compatibility with other additives. The invention also provides a preparation method of the solid degassing agent for concrete.
In order to solve the technical problem, the technical scheme adopted by the application is as follows:
a solid degassing agent for concrete is composed of carrier (40-60%), fatty alcohol-polyoxyethylene polyoxypropylene ether fatty acid ester (10-30%), polyether-modified polyorganosiloxane (10-30%) and fatty alcohol-polyoxyethylene polyoxypropylene ether carboxylate (5-15%).
In the components of the solid degasifier for concrete, fatty alcohol polyoxyethylene polyoxypropylene ether fatty acid ester and polyether modified polysiloxane are main defoaming substances, and fatty alcohol polyoxyethylene polyoxypropylene ether carboxylate can enhance the defoaming performance of the fatty alcohol polyoxyethylene polyoxypropylene ether fatty acid ester and the polyether modified polysiloxane and improve the compatibility of the fatty alcohol polyoxyethylene polyoxypropylene ether fatty acid ester and the polyether modified polysiloxane with other additives of concrete.
The carrier is selected from one or more of sodium sulfate, sodium silicate, sodium carbonate, sodium bicarbonate, calcium carbonate, zeolite, diatomite, bentonite and silicon dioxide.
The fatty alcohol polyoxyethylene polyoxypropylene ether fatty acid ester has a structural general formula of { R 1 O(EO) m (PO) n COR 2 } p Wherein R is 1 Is alkyl with 1 to 22 carbon atoms; m is an integer of 1 to 10, n is an integer of 20 to 40, R 2 Is an alkyl group having 12 to 22 carbon atoms, and p is 1, 2 or 3.
The polyether modified polysiloxane has a structural general formula as follows: r is 3 3 SiO(Me 2 SiO) a (MeSiR 4 O) b SiR 3 3 Wherein R is 3 Is methyl, ethyl, propyl or butyl, a is an integer of 1 to 200, b is an integer of 10 to 100, R 4 Is (CH 2) c O(EO) d (PO) e R 5 C is an integer of 3 to 6, d and e are integers of 1 to 50, and R5 is a hydrogen atom, methyl, ethyl, propyl or butyl.
The fatty alcohol polyoxyethylene polyoxypropylene ether carboxylate has a structural general formula of { R 6 O(EO) x (PO) y CH2COO} z M, wherein R6 is alkyl with 1-22 carbon atoms, x is an integer from 1-10, y is an integer from 20-40, z is 1, 2 or 3, M is selected from hydrogen, sodium, magnesium, calcium and aluminum.
The preparation method of the solid degassing agent for concrete comprises the following steps:
1) Stirring and mixing fatty alcohol polyoxyethylene polyoxypropylene ether fatty acid ester, polyether modified polysiloxane and fatty alcohol polyoxyethylene polyoxypropylene ether carboxylate uniformly to obtain a mixture;
2) And (2) uniformly stirring and mixing the mixture obtained in the step (1) and a carrier to obtain the solid degassing agent.
The solid degassing agent for concrete is applied to concrete.
Has the advantages that: compared with the prior art, the method has the following advantages:
1) The application discloses solid degassing agent for concrete, fatty alcohol polyoxyethylene polyoxypropylene ether fatty acid ester and polyether modified polysiloxane are used as defoaming substances, fatty alcohol polyoxyethylene polyoxypropylene ether carboxylate with a specific structure is introduced, so that the defoaming agent has a defoaming enhancement effect in concrete, meanwhile, the compatibility between the fatty alcohol polyoxyethylene polyoxypropylene ether fatty acid ester, the polyether modified polysiloxane and other additives of the concrete can be improved, and the product has excellent compatibility and defoaming performance.
2) The preparation process is simple, and the target product can be obtained by uniformly mixing the defoaming substance and the fatty alcohol polyoxyethylene polyoxypropylene carboxylate and then uniformly mixing the defoaming substance and the carrier.
Detailed Description
The present invention will be further described with reference to the following specific examples.
In the following examples and comparative examples, starting material A was used: fatty alcohol polyoxyethylene polyoxypropylene ether fatty acid ester with a structural general formula of { R 1 O(EO) m (PO) n COR 2 } p Wherein R is 1 Is alkyl with 1 to 22 carbon atoms; m is an integer of 1 to 10, n is an integer of 20 to 40, R 2 Is an alkyl group having 12 to 22 carbon atoms, and p is 1, 2 or 3. A typical structure is shown in table 1.
Table 1: typical fatty alcohol polyoxyethylene polyoxypropylene ether fatty acid ester
Name (R) | R 1 | m | n | R2 | p |
A1 | Propyl radical | 5 | 40 | Dodecyl radical | 3 |
A2 | Octadecyl radical | 10 | 20 | Octadecyl radical | 1 |
A3 | Propyl radical | 1 | 30 | Docosyl | 2 |
A4 | Propyl radical | 20 | 40 | Dodecyl radical | 3 |
Raw material B used: polyether modified polyorganosiloxane with the structural general formula: r 3 3 SiO(Me 2 SiO) a (MeSiR 4 O) b SiR 3 3 Wherein R3 is methyl, ethyl, propyl or butyl, a is an integer of 1 to 200, b is an integer of 10 to 100, R 4 Is (CH) 2 ) c O(EO) d (PO) e R 5 C is an integer of 3 to 6, d and e are integers of 1 to 50, R 5 Is hydrogen atom, methyl, ethyl, propyl or butyl. A typical structure is shown in table 2.
Table 2: typical polyether modified polyorganosiloxanes
Name (R) | R 3 | a | b | c | d | e | R 5 |
B1 | Methyl radical | 200 | 50 | 3 | 20 | 20 | Hydrogen atom |
B2 | Ethyl radical | 100 | 100 | 4 | 5 | 50 | Methyl radical |
B3 | Methyl radical | 10 | 10 | 3 | 50 | 10 | Butyl radical |
Raw material C used: the fatty alcohol polyoxyethylene polyoxypropylene ether carboxylate has a structural general formula as follows: { R 6 O(EO) x (PO) y CH 2 COO} z M, wherein R 6 And the above R 1 The same applies to x, y, z and M, wherein x is the same as M, y is the same as n, z is the same as p, and M is any one ion selected from hydrogen, sodium, magnesium, calcium and aluminum. The dosage of the fatty alcohol polyoxyethylene polyoxypropylene ether carboxylate accounts for 5-15% of the total amount of the degassing agent. A typical structure is shown in table 3.
Table 3: typical fatty alcohol polyoxyethylene polyoxypropylene ether carboxylates
Name (R) | R 6 | x | y | z | M |
C1 | Propyl radical | 5 | 40 | 3 | Hydrogen |
C2 | Octadecyl radical | 10 | 20 | 1 | Sodium salt |
C3 | Propyl radical | 1 | 30 | 2 | Magnesium alloy |
C4 | Dodecyl radical | 10 | 40 | 1 | Hydrogen |
C5 | Propyl radical | 20 | 40 | 3 | Hydrogen |
Example 1
Typical compositions of the degassing agents (D1-D4) and of the comparative products (F1-F5) are shown in Table 4, and the preparation processes are identical and are: uniformly stirring and mixing the component A, the component B and the component C with the designed dosage to obtain a mixture E1-E4 and a comparison mixture H1-H5, then adding the mixture into the carrier with the designed dosage, and uniformly stirring and mixing to obtain various degassing agent products (D1-D4) and comparison products (F1-F5).
Table 4: typical composition of degassing agent D
Name(s) | A | B | C | Carrier |
D1 | 20 parts of A1 | 20 parts of B1 | 15 parts of C1 | 45 parts of sodium sulfate |
D2 | 30 parts of A2 | 10 parts of B2 | 5 parts of C2 | 55 parts of calcium carbonate |
D3 | 10 parts of A3 | 30 parts of B3 | 10 parts of C3 | 50 parts of zeolite |
D4 | 20 parts of A1 | 20 parts of B2 | 10 parts of C4 | 50 parts of silicon dioxide |
F1 | 20 parts of A4 | 20 parts of B1 | 15 parts of C1 | 45 parts of sodium sulfate |
F2 | 30 parts of A2 | 10 parts of B2 | 5 parts of C5 | 55 parts of calcium carbonate |
F3 | 20 parts of A3 | 30 parts of B3 | / | 50 parts of zeolite |
F4 | 40 parts of A1 | / | 10 parts of C4 | 50 parts of silicon dioxide |
F5 | / | 40 parts of B3, | 10 parts of C3 | 50 parts of zeolite |
The product is subjected to performance test, and the specific method is as follows:
1. compatibility testing
The liquid mixtures (E1-E4, H1-H5) of each product were added to the water-reducing agent at an addition level of 0.2%, left at 25 ℃ for 30 days, and the compatibility was visually observed.
2. Defoaming Performance test
According to the water: river sand: cement (compliant with GB 175): water reducing agent (polycarboxylic acid water reducing agent): the concrete is prepared by the concrete with the degasifier mass ratio of 150: 300: 3: 1.5, and river sand, cement, water reducer, degasifier and water are firstly stirred at low speed for 60s, then are stood still for 30s and then are stirred at high speed for 60s by using a planetary cement mortar stirrer. And pouring the stirred mortar into a measuring range, recording the volume corresponding to the mass of the mortar, and calculating the density. Density = mortar mass/mortar volume. The defoaming performance is expressed in terms of density, and the higher the density, the better the defoaming performance is.
3. The test results are shown in Table 5
Table 5: test results
Product(s) | Compatibility | Product(s) | Density (g/mL) |
E1 | ◎ | D1 | 2.03 |
E2 | ◎ | D2 | 2.01 |
E3 | ◎ | D3 | 2.01 |
E4 | ◎ | D4 | 2.00 |
H1 | × | F1 | 1.87 |
H2 | × | F2 | 1.78 |
H3 | × | F3 | 1.70 |
H4 | ◎ | F4 | 1.88 |
H5 | ◎ | F5 | 1.75 |
In table 5 ∈ indicates that the product has good compatibility with the water reducing agent and no separation or adhesion occurred, and ×. Indicates that the product has poor compatibility with the water reducing agent and separation or adhesion occurred to the wall surface of the container.
The test result shows that compared with a comparative product, the defoaming agent prepared by the method has good compatibility with the additive water reducing agent of concrete in the presence of fatty alcohol polyoxyethylene polyoxypropylene ether carboxylate, and the prepared degassing agent has good defoaming performance.
Claims (4)
1. A solid degassing agent for concrete is characterized by comprising 40-60% of a carrier, 10-30% of fatty alcohol polyoxyethylene polyoxypropylene ether fatty acid ester, 10-30% of polyether modified polysiloxane and 5-15% of fatty alcohol polyoxyethylene polyoxypropylene ether carboxylate;
the fatty alcohol polyoxyethylene polyoxypropylene ether fatty acid ester has a structural general formula of { R 1 O(EO) m (PO) n COR 2 } p Wherein R is 1 Is an alkyl group with 1 to 22 carbon atoms; m is an integer of 1 to 10, n is an integer of 20 to 40, R 2 Is alkyl with 12 to 22 carbon atoms, and p is 1, 2 or 3;
the polyether modified polysiloxane has a structural general formula as follows: r 3 3 SiO(Me 2 SiO) a (MeSiR 4 O) b SiR 3 3 Wherein R is 3 Is methyl, ethyl, propyl or butyl, a is an integer from 1 to 200, b is an integer from 10 to 100, R 4 Is (CH) 2 ) c O(EO) d (PO) e R 5 C is an integer of 3 to 6, d and e are integers of 1 to 50, R 5 Is hydrogen atom, methyl, ethyl, propyl or butyl;
the fatty alcohol polyoxyethylene polyoxypropylene ether carboxylate has a structural general formula of { R 6 O(EO) x (PO) y CH 2 COO} z M, wherein R 6 Is an alkyl group having 1 to 22 carbon atoms, x is an integer of 1 to 10, y is an integer of 20 to 40, z is 1, 2 or 3, M is selected from hydrogen, sodium, magnesium, calcium and aluminum.
2. The solid degassing agent for concrete according to claim 1, wherein the carrier is one or more selected from the group consisting of sodium sulfate, sodium silicate, sodium carbonate, sodium bicarbonate, calcium carbonate, zeolite, diatomaceous earth, bentonite, and silica.
3. The method for preparing a solid degassing agent for concrete according to claim 1, comprising the steps of:
1) Stirring and mixing fatty alcohol polyoxyethylene polyoxypropylene ether fatty acid ester, polyether modified polysiloxane and fatty alcohol polyoxyethylene polyoxypropylene ether carboxylate uniformly to obtain a mixture;
2) And (2) uniformly stirring and mixing the mixture obtained in the step (1) and a carrier to obtain the solid degassing agent.
4. Use of the solid air release agent for concrete according to claim 1 in concrete.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202210109986.0A CN114470882B (en) | 2022-01-28 | 2022-01-28 | Solid degassing agent for concrete and preparation method thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202210109986.0A CN114470882B (en) | 2022-01-28 | 2022-01-28 | Solid degassing agent for concrete and preparation method thereof |
Publications (2)
Publication Number | Publication Date |
---|---|
CN114470882A CN114470882A (en) | 2022-05-13 |
CN114470882B true CN114470882B (en) | 2023-04-07 |
Family
ID=81479112
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202210109986.0A Active CN114470882B (en) | 2022-01-28 | 2022-01-28 | Solid degassing agent for concrete and preparation method thereof |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN114470882B (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3668793B2 (en) * | 1999-04-09 | 2005-07-06 | サンノプコ株式会社 | W / O / W type antifoam composition |
US8236889B2 (en) * | 2009-05-15 | 2012-08-07 | Kemira Chemicals, Inc. | Polymeric defoamer additive |
CN106215466A (en) * | 2016-08-27 | 2016-12-14 | 合肥普庆新材料科技有限公司 | A kind of preparation method of high stability of siloxane defoamer |
CN113493324A (en) * | 2020-04-03 | 2021-10-12 | 江苏四新科技应用研究所股份有限公司 | Preparation method of solid defoaming agent for concrete stirring |
CN112057904B (en) * | 2020-08-25 | 2021-07-09 | 北京金隅水泥节能科技有限公司 | Defoaming agent and production process and application thereof |
CN112707676B (en) * | 2020-10-23 | 2022-04-22 | 科之杰新材料集团有限公司 | Concrete defoaming agent and preparation method thereof |
-
2022
- 2022-01-28 CN CN202210109986.0A patent/CN114470882B/en active Active
Also Published As
Publication number | Publication date |
---|---|
CN114470882A (en) | 2022-05-13 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6428500B2 (en) | Thickener for one-pack type water reducing agent, one-pack type water reducing agent, and method for producing hydraulic composition containing the same | |
US8933151B2 (en) | Shrinkage-reducing agent for hydraulic material | |
CN103359972B (en) | Polycarboxylic acid water reducer for preparing fair-faced concrete | |
CN102112412A (en) | Shrinkage-reducing agent for hydraulic material and shrinkage-reducing agent composition for hydraulic material | |
MX2013010503A (en) | Composition for the optimization of mineral building material compositions. | |
CN107365101A (en) | Water-based emulsion based on propyl group Ethoxysilane oligomer is used for the purposes for reducing Shrinkage behavior in cement admixture | |
CN110342895B (en) | Slow-release silane powder, super-hydrophobic cement-based flexible waterproof coating and preparation method thereof | |
CN114470882B (en) | Solid degassing agent for concrete and preparation method thereof | |
WO2004065318A1 (en) | Additive for water-curable composition | |
JP5717749B2 (en) | Powder composition | |
CN115215581B (en) | Concrete foam stabilizer, preparation method thereof, concrete water reducing agent and concrete | |
JP2006069815A (en) | Foaming agent for aerated concrete, and aerated concrete | |
CN107835795A (en) | Poly-alkoxylation polyamine oxidase thing defoaming composition | |
JP2018130957A (en) | Flask release agent | |
JP7267997B2 (en) | Antifoam composition and admixture for hydraulic composition containing the same | |
WO2018199055A1 (en) | Admixture composition for hydraulic composition | |
JP4724697B2 (en) | Drying shrinkage-reducing cement dispersant | |
JP2021031368A (en) | Concrete admixture, concrete composition, method for placing concrete composition, and mass concrete | |
JP5077904B2 (en) | Antifoaming agent for cement composition | |
CN117401931A (en) | Powder defoaming agent for self-leveling cement | |
CN115925317B (en) | Concrete apparent mass modifier attached to oily release agent and preparation method thereof | |
JP2019196282A (en) | Hydration heat suppressing agent for hydraulic composition | |
CN117003508B (en) | Polycarboxylate superplasticizer for prefabricated part, concrete and preparation method of polycarboxylate superplasticizer | |
JP2006045013A (en) | Foaming agent for foamed concrete, and foamed concrete | |
JP2005089196A (en) | Method for producing phosphoric acid ester or salt 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 |