CN116200101A - 一种水性环氧涂料的制备方法 - Google Patents
一种水性环氧涂料的制备方法 Download PDFInfo
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- CN116200101A CN116200101A CN202310218147.7A CN202310218147A CN116200101A CN 116200101 A CN116200101 A CN 116200101A CN 202310218147 A CN202310218147 A CN 202310218147A CN 116200101 A CN116200101 A CN 116200101A
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- parts
- water
- acid
- emulsifier
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 238000002360 preparation method Methods 0.000 title claims abstract description 36
- 239000004593 Epoxy Substances 0.000 title claims description 45
- 239000003973 paint Substances 0.000 title claims description 36
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 68
- 229920006334 epoxy coating Polymers 0.000 claims abstract description 6
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 claims description 57
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 54
- 239000003795 chemical substances by application Substances 0.000 claims description 54
- HOVAGTYPODGVJG-UVSYOFPXSA-N (3s,5r)-2-(hydroxymethyl)-6-methoxyoxane-3,4,5-triol Chemical compound COC1OC(CO)[C@@H](O)C(O)[C@H]1O HOVAGTYPODGVJG-UVSYOFPXSA-N 0.000 claims description 51
- HOVAGTYPODGVJG-UHFFFAOYSA-N methyl beta-galactoside Natural products COC1OC(CO)C(O)C(O)C1O HOVAGTYPODGVJG-UHFFFAOYSA-N 0.000 claims description 51
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 40
- 239000003822 epoxy resin Substances 0.000 claims description 38
- 229920000647 polyepoxide Polymers 0.000 claims description 38
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 37
- 239000000049 pigment Substances 0.000 claims description 37
- 239000000047 product Substances 0.000 claims description 37
- 238000003756 stirring Methods 0.000 claims description 36
- 238000002156 mixing Methods 0.000 claims description 35
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 33
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 30
- 102000004190 Enzymes Human genes 0.000 claims description 29
- 108090000790 Enzymes Proteins 0.000 claims description 29
- 239000002808 molecular sieve Substances 0.000 claims description 29
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 29
- WLJVNTCWHIRURA-UHFFFAOYSA-N pimelic acid Chemical compound OC(=O)CCCCCC(O)=O WLJVNTCWHIRURA-UHFFFAOYSA-N 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 24
- 239000003792 electrolyte Substances 0.000 claims description 21
- 239000012752 auxiliary agent Substances 0.000 claims description 20
- 239000011780 sodium chloride Substances 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 19
- 239000013530 defoamer Substances 0.000 claims description 18
- TYFQFVWCELRYAO-UHFFFAOYSA-N suberic acid Chemical compound OC(=O)CCCCCCC(O)=O TYFQFVWCELRYAO-UHFFFAOYSA-N 0.000 claims description 18
- 238000004806 packaging method and process Methods 0.000 claims description 17
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 claims description 16
- 239000000945 filler Substances 0.000 claims description 16
- 238000001914 filtration Methods 0.000 claims description 16
- 238000000227 grinding Methods 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 16
- 239000002253 acid Substances 0.000 claims description 15
- HZTPKMIMXLTOSK-UHFFFAOYSA-N 2-bromohexanoic acid Chemical compound CCCCC(Br)C(O)=O HZTPKMIMXLTOSK-UHFFFAOYSA-N 0.000 claims description 14
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 14
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 239000002518 antifoaming agent Substances 0.000 claims description 12
- 238000005886 esterification reaction Methods 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 239000007810 chemical reaction solvent Substances 0.000 claims description 11
- 239000008367 deionised water Substances 0.000 claims description 11
- 229910021641 deionized water Inorganic materials 0.000 claims description 11
- 230000002255 enzymatic effect Effects 0.000 claims description 11
- 239000012074 organic phase Substances 0.000 claims description 11
- 239000003208 petroleum Substances 0.000 claims description 11
- 238000010898 silica gel chromatography Methods 0.000 claims description 11
- 230000032050 esterification Effects 0.000 claims description 10
- 230000035484 reaction time Effects 0.000 claims description 10
- 238000010276 construction Methods 0.000 claims description 9
- NQRFAUVGDLHPGH-UHFFFAOYSA-N 2-bromoheptanoic acid Chemical compound CCCCCC(Br)C(O)=O NQRFAUVGDLHPGH-UHFFFAOYSA-N 0.000 claims description 8
- WMFATTFQNRPXBQ-UHFFFAOYSA-N 2-bromopentanoic acid Chemical compound CCCC(Br)C(O)=O WMFATTFQNRPXBQ-UHFFFAOYSA-N 0.000 claims description 8
- 239000000654 additive Substances 0.000 claims description 8
- 230000000996 additive effect Effects 0.000 claims description 8
- 239000001361 adipic acid Substances 0.000 claims description 8
- 235000011037 adipic acid Nutrition 0.000 claims description 8
- SEACYXSIPDVVMV-UHFFFAOYSA-L eosin Y Chemical compound [Na+].[Na+].[O-]C(=O)C1=CC=CC=C1C1=C2C=C(Br)C(=O)C(Br)=C2OC2=C(Br)C([O-])=C(Br)C=C21 SEACYXSIPDVVMV-UHFFFAOYSA-L 0.000 claims description 8
- 239000012467 final product Substances 0.000 claims description 8
- 150000002989 phenols Chemical class 0.000 claims description 8
- 239000004848 polyfunctional curative Substances 0.000 claims description 8
- 238000002390 rotary evaporation Methods 0.000 claims description 8
- 235000010215 titanium dioxide Nutrition 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 229910021397 glassy carbon Inorganic materials 0.000 claims description 7
- 229910052697 platinum Inorganic materials 0.000 claims description 7
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 7
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 claims description 7
- 125000003158 alcohol group Chemical group 0.000 claims description 6
- -1 alpha-bromoacid Chemical compound 0.000 claims description 4
- 239000006229 carbon black Substances 0.000 claims description 3
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 claims description 3
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 claims description 3
- 229910000165 zinc phosphate Inorganic materials 0.000 claims description 3
- 229910000611 Zinc aluminium Inorganic materials 0.000 claims description 2
- 125000003277 amino group Chemical group 0.000 claims 1
- 238000000576 coating method Methods 0.000 abstract description 11
- 239000011248 coating agent Substances 0.000 abstract description 10
- 239000002245 particle Substances 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 6
- 239000004094 surface-active agent Substances 0.000 description 11
- 150000001412 amines Chemical class 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 239000000693 micelle Substances 0.000 description 6
- 239000004408 titanium dioxide Substances 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000003480 eluent Substances 0.000 description 5
- 230000001804 emulsifying effect Effects 0.000 description 5
- 239000000839 emulsion Substances 0.000 description 5
- 239000006260 foam Substances 0.000 description 5
- 238000009736 wetting Methods 0.000 description 5
- 239000002736 nonionic surfactant Substances 0.000 description 4
- 238000006722 reduction reaction Methods 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- 239000003945 anionic surfactant Substances 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000003093 cationic surfactant Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000005695 dehalogenation reaction Methods 0.000 description 3
- 125000003700 epoxy group Chemical group 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 239000002563 ionic surfactant Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002952 polymeric resin Substances 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 239000002280 amphoteric surfactant Substances 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 239000002519 antifouling agent Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 230000005501 phase interface Effects 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 150000007519 polyprotic acids Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 239000002888 zwitterionic surfactant Substances 0.000 description 1
Images
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P19/00—Preparation of compounds containing saccharide radicals
- C12P19/44—Preparation of O-glycosides, e.g. glucosides
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B3/00—Electrolytic production of organic compounds
- C25B3/01—Products
- C25B3/07—Oxygen containing compounds
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Zoology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Microbiology (AREA)
- Biotechnology (AREA)
- Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Genetics & Genomics (AREA)
- Electrochemistry (AREA)
- Metallurgy (AREA)
- Paints Or Removers (AREA)
Abstract
Description
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN202310218147.7A CN116200101A (zh) | 2023-03-08 | 2023-03-08 | 一种水性环氧涂料的制备方法 |
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CN202310218147.7A CN116200101A (zh) | 2023-03-08 | 2023-03-08 | 一种水性环氧涂料的制备方法 |
Publications (1)
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CN116200101A true CN116200101A (zh) | 2023-06-02 |
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CN202310218147.7A Pending CN116200101A (zh) | 2023-03-08 | 2023-03-08 | 一种水性环氧涂料的制备方法 |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102757713A (zh) * | 2012-08-02 | 2012-10-31 | 广州飞宇建材科技有限公司 | 一种高耐污内墙涂料及其制备方法 |
CN102861532A (zh) * | 2012-09-21 | 2013-01-09 | 浙江大学 | 一种十八醇葡萄糖双子表面活性剂及其制备方法 |
CN109401537A (zh) * | 2018-09-27 | 2019-03-01 | 天津美士邦涂料化工有限公司 | 一种水性环氧中间漆的制备方法 |
-
2023
- 2023-03-08 CN CN202310218147.7A patent/CN116200101A/zh active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102757713A (zh) * | 2012-08-02 | 2012-10-31 | 广州飞宇建材科技有限公司 | 一种高耐污内墙涂料及其制备方法 |
CN102861532A (zh) * | 2012-09-21 | 2013-01-09 | 浙江大学 | 一种十八醇葡萄糖双子表面活性剂及其制备方法 |
CN109401537A (zh) * | 2018-09-27 | 2019-03-01 | 天津美士邦涂料化工有限公司 | 一种水性环氧中间漆的制备方法 |
Non-Patent Citations (3)
Title |
---|
CHUNLI GAO等: "Enzymatic synthesis of dimeric and trimeric sugar-fatty acid esters", ENZYME AND MICROBIAL TECHNOLOGY, no. 25, pages 264 - 270 * |
田铁牛: "有机合成单元过程", 化学工业出版社, pages: 212 - 213 * |
闫顺杰等: "糖基双子表面活性剂的研究进展", 日用化学工业, vol. 43, no. 3, pages 217 - 223 * |
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Effective date of registration: 20240521 Address after: 432400 North of Development Avenue, Changjiangbu Street Office, Yingcheng City, Xiaogan City, Hubei Province Applicant after: Hubei Hongcheng Coating Technology Co.,Ltd. Country or region after: China Address before: 014010 Room 201, Unit 1, Building 13, Donghe Huayuan, Mingri Xingcheng, Donghe District, Baotou City, Inner Mongolia Autonomous Region Applicant before: Wang Lei Country or region before: China |