CN1616567A - Water anti-corrosion paint and its preparing method - Google Patents
Water anti-corrosion paint and its preparing method Download PDFInfo
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- CN1616567A CN1616567A CN 200410083945 CN200410083945A CN1616567A CN 1616567 A CN1616567 A CN 1616567A CN 200410083945 CN200410083945 CN 200410083945 CN 200410083945 A CN200410083945 A CN 200410083945A CN 1616567 A CN1616567 A CN 1616567A
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Abstract
The present invention discloses a kind of nano water anticorrosive paint for inside of the steel heat radiator. The paint consists of modified epoxy resin comprising epoxy resin, phenolic resin, p-aminobenzoic acid; pigment and stuffing comprising titanium dioxide powder, kaolin and nano iron oxide red, iron oxide black or others; distilled water as diluent; water soluble assistants fluorocarbon resin, nano titanium dioxide powder, modified polyether silicon oil, etc. The inner anticorrosive paint with excellent performance is painted in the inner surface of phosphorized steel heat radiator and the coating can resist corrosion and shock of 140 deg.c alkali water. The paint has no toxicity and no smell and this is favorable to the operator and environment.
Description
Technical field
The present invention relates to a kind of water-based anticorrosive paint and preparation method thereof, particularly a kind of high performance and long service life steel is with nonpoisonous and tasteless nano aqueous scatterer inner side anticorrosion coating and preparation method thereof.
Background technology
One of outstanding problem that steel system scatterer faces is interior anticorrosion, promptly how to prevent the corrosion of High Temperature High Pressure alkaline boiler water to radiator inwall, thereby solves the long lifetime of scatterer and the problem of safe operation.
At anticorrosion problem in the scatterer, people have invented the whole bag of tricks and have solved it.Comprise electro-galvanizing, nickel plating, chemical plating nickel-phosphorus alloy, coating protection, electrochemical cathodic protection and add inhibiter etc., but implement that various shortcomings are arranged.Electrochemical cathodic protection (magnesium anode) method is difficult to guarantee that all there is sufficient protection at each position to scatterer; Electroplate and electroless plating, it is bigger to implement difficulty, and cost is also higher relatively; Add the method for inhibiter and can only slow down corrosion to a certain extent, and will be at different system, different quality, research is effectively inhibiter and suitably addition accordingly, and this operational management to system has also proposed a difficult problem.Comparatively speaking, the interior application of coating (method with can is implemented) is easier.After the scatterer welding fabrication, by can internal surface is carried out pre-treatment and cleaning fully, oven dry can be carried out the application of coating.The key of this method is to select suitable coating.The sticking power of coating high temperature resistant alkaline water corrosive nature and coating and protected metal is that coating is selected the key technical indexes.
The scatterer inner side anticorrosion coating of developing at present is by TY3318, the TY3319 of Wuhan Inst. of Material Protection; its main component is phenol aldehyde modified Resins, epoxy; its maximum shortcoming is to use a large amount of high volatile volatile organic solvents; cause the coating smell excessive, be unfavorable for environment protection and operator's health.In addition, when envrionment temperature was lower than 15 ℃, it was mobile poor, should not construct, and sticking power is relatively poor on steel radiator, can not satisfy shortcomings such as scatterer erosion resistance requirement.
Water-borne coatings is the technology that grows up in the sixties in last century, but for a long time, water-borne coatings is except that helping environmental protection, all far away not as good as traditional organic solvent type coating, its research emphasis is to dwindle and the gap of conventional solvent type coating on every performance to other main performance index as far as possible in recent years.Inorganic zinc coating is the important kind of water-based anticorrosive paint, mainly as priming paint, has excellent antiseptic property.Domestic water-based high-module potassium silicate, the lithium silicate zinc-rich paint of exploitation are in recent years used on engineering, and performance is updated, and is accepted by all trades and professions as the environment friendly anti-corrosive paint of a kind of zero VOC.But the performance of heat-resisting the aqueous corrosion performance, particularly anti-mobile hot-water corrosion of this coating can not satisfy rot-resistant requirement in the scatterer far away.The man enterprise of domestic number adopts nucleocapsid structure, self-emulsifying polymerized emulsion manufacturing technology to prepare nano-scale water acrylic modified alkyd latex, nano-scale water aminoacrylic acid acid modified alcoholic latex, water-based epoxy acrylic amino fine latex and by the serial water-based anticorrosive paint of these latex preparation, has begun to be used for the anticorrosion of fields such as petrochemical complex, metallurgy, hardware and electrical equipment, automobile, rolling stock, lorry, boats and ships.But no matter that a kind of product all can not be resisted the corrosion of high-temperature alkaline hot water.Cathode electrophoresis dope develops very fast at home and abroad, and has obtained many new achievements.What representative was wherein arranged most is thick-film type cathode electrophoresis dope, low temperature curing type and color cathode electrophoretic paint, and the time of the anti-80 ℃ of thermokalite aqueous corrosions of these several coatings still can not meet the demands all below 100 hours.
Water-borne coatings is stronger to the dependency of construction environment in addition, how to guarantee that the good coating of obtained performance also is the problem that water-based anticorrosive paint solves emphatically under high humidity, low temperature and enclosed environment.
Nano paint is to follow the development of nanotechnology in recent years and the new coating that occurs, its usually add a kind of to several Nano fillings and with coating in organic polymer generation bonding action, can produce synergy between the various Nano fillings simultaneously, its scrub resistance, hardness, fineness, ageing resistance, stain resistance all are improved largely, and had purify air, sterilization, bacteriostatic function.Because Nano filling has surface enrichment trend, and nano paint is in film process, the top layer can form nano material enrichment layer, makes its surface property higher, further prolongs the work-ing life of coating simultaneously.Although the interpolation of nano material can increase substantially the performance of coating, also there are not other high temperature resistant hot alkali water corrosive nano-waterborne coatings to occur at present.
Summary of the invention
One of purpose of the present invention provides a kind of high temperature resistant alkali resistance aqueous corrosion, strong adhesion, and good fluidity, the fill operations wide ranges, and ten minutes helps the nano aqueous protective system of environment protection.
Another object of the present invention provides the high temperature resistant alkali resistance aqueous corrosion of a kind of energy preparation, strong adhesion, and good fluidity, the fill operations wide ranges, and ten minutes helps the preparation method of the nano aqueous protective system of environment protection.
For achieving the above object, the present invention takes following technical scheme:
A kind of water-based anticorrosive paint is characterized in that comprising by following raw material components: Resins, epoxy, resol, extraordinary silicone oil or para-amino benzoic acid, filler, nano dye or common pigments, nanometer titanium dioxide also have resin solvent and water solvent.
A kind of preparation method of protective system, its steps in sequence is:
(1) is solvent with the alcohol ether type organic, Resins, epoxy carried out modification, obtain modified resin FH with resol;
(2) be solvent with the alcohol ether type organic, the FH resin carried out modification, get modification FH resin with para-amino benzoic acid or extraordinary silicone oil;
(3) in above-mentioned modification FH resin, add filler, nano dye, nanometer titanium dioxide, stir, grind, get compound;
(4) in above-mentioned compound, add distilled water while stirring, transfer to needed viscosity.
Preferred in the composition of water-based anticorrosive paint: the resol of 30～50 parts by weight of epoxy resin, 10～20 weight parts, the extraordinary silicone oil of 5～15 weight parts or para-amino benzoic acid, 10～20 weight part fillers, 1～3 weight part nano dye or common pigments, 1～3 weight part nanometer titanium dioxide, the alcohol ether type organic of 5～10 weight parts, the distilled water of 25～40 weight parts are lower than the auxiliary agent of 1 weight part in addition.
The processing condition that are preferably as follows among the preparation method of protective system:
(1) in the time of 40～90 ℃, is solvent, 30～50 parts by weight of epoxy resin carried out modification, obtain modified resin FH with 10～20 weight part resol with the alcohol ether type organic;
(2) in the time of 60～110 ℃, be solvent, the FH resin carried out modification with the para-amino benzoic acid or the extraordinary silicone oil of 5～15 weight parts with the alcohol ether type organic, modification FH resin;
(3) in above-mentioned modification FH resin, add 10～30 weight part fillers, 1～3 weight part nano dye, 1-3 weight part nanometer titanium dioxide and 0.5～1 weight part auxiliary agent, stir, grind, get compound;
(4) in above-mentioned compound, add the distilled water of 15～40 weight parts while stirring, transfer to needed viscosity.
Described Resins, epoxy can be E-44, E-51, E-20, E-9 etc.
Described resol can be ethanol-soluble type resol, oily molten type resol etc.
Described filler can be silicate compounds such as titanate compounds such as titanium dioxide, barium titanate powder and kaolin.
Described pigment can be nano dye such as nanometer iron oxide red, nanometer titanium white or common pigments such as soft black, iron oxide red, chrome green.
Described auxiliary agent (mainly referring to flow agent) can be water-based flow agents such as fluorine-carbon modified polyether silicone oil, water-soluble fluorine carbon resin.
The using method of this protective system is: (1) carries out steel radiator the pre-treatment of steps such as degreasing and rust removal and phosphatization; (2) throw inner side anticorrosion coating into scatterer with pump, circulate, subsequently coating is poured out and scatterer is drained; (3) scatterer is put in the roaster toasted, make curing of coating, storing temperature is for good about 180 ℃.
Resins, epoxy can improve the corrosion resisting property and the sticking power of coating; Resol has resistance to elevated temperatures; Para-amino benzoic acid or extraordinary silicone oil can make filmogen have certain wetting ability.
Advantage of the present invention is: compare with existing modified acroleic acid coating, protective system of the present invention is formed modified epoxy with Resins, epoxy, resol, para-amino benzoic acid (or extraordinary silicone oil), high temperature resistant alkali resistance aqueous corrosion, strong adhesion, good fluidity, fill operations wide ranges, make film can anti-140 ℃ of high-temperature alkaline water (more than the pH12) corrosion, sticking power and high temperature resistance dynamic loop water slug corrosive performance all belong to good.Can guarantee the work-ing life of steel radiator.And be water-borne coatings, have environment-friendly function, the nontoxic odorlessness of this coating very helps operator's health and environment protection.
The present invention will be further described below by embodiment, but and do not mean that limiting the scope of the invention.
Embodiment
Comparative Examples
The component of existing modified acroleic acid coating is: the Acrylic Acid Monomer of 200 grams, the multiple Resins, epoxy of 100 grams, the additive (as aerosil) of 50 grams, the mixed diluent of 350 grams (diacetone alcohol and ethanol were by 3: 1 mixed).
Concrete compound method is to prepare modification acrylic acid resin down at 150 ℃ earlier, in modification acrylic acid resin, add filler (talcum powder), pigment (titanium dioxide) and auxiliary agent (aerosil) again, fully stir with homogenizer, use sand mill that compound is fully ground, re-use homogenizer and in compound, add mixed diluent, adjust viscosity, to adjusting the coating barrelling of viscosity.
Embodiment 1
A kind of preparation method of nano aqueous protective system, its steps in sequence is:
(1) be solvent with the many ether of propylene glycol in the time of 40～90 ℃, the E-20 Resins, epoxy that adds 50 weight parts with 10 weight parts alcohol dissolubility resol carries out modification, obtains modified resin FH system;
(2) para-amino benzoic acid with 5 weight parts carries out modification to above-mentioned resin system in the time of 60～110 ℃, gets hydrophilic FH resin;
(3) in above-mentioned hydrophilic FH resin system, add filler (15 weight part titanium dioxide), pigment (1.2 weight part nanometer iron oxide red), 1 weight part nanometer titanium dioxide and flow agent (0.8 weight part organic silicon modified by polyether), fully stir with homogenizer, use sand mill that compound is fully ground, re-use the distilled water of homogenizer interpolation 25 weight parts in the compound; Get protective system 1 of the present invention.
Embodiment 2
A kind of preparation method of nano aqueous protective system, its steps in sequence is:
(1) be solvent with the many ether of ethylene glycol in the time of 40～90 ℃, the E-20 Resins, epoxy that adds 80 weight parts with 40 weight parts alcohol dissolubility resol carries out modification, obtains resin FH system;
(2) para-amino benzoic acid with 15 weight parts carries out modification to above-mentioned FH resin system in the time of 60～110 ℃, gets wetting ability FH resin;
(3) in above-mentioned wetting ability FH resin, add filler (5 weight part titanium dioxides, 10 weight part kaolin), pigment (the common iron oxide red of 1.3 weight parts), 2 weight part nanometer titanium dioxides and flow agent (the fluorine-carbon modified polyether silicone oil of 0.5 weight part), fully stir with homogenizer, use sand mill that compound is fully ground, re-use the distilled water of homogenizer interpolation 30 weight parts in the compound; Get protective system 2 of the present invention.
Embodiment 3
A kind of preparation method of nano aqueous protective system, its steps in sequence is:
(1) be solvent with the ethylene glycol monoethyl ether in the time of 40～90 ℃, the E-51 Resins, epoxy that adds 65 weight parts with 25 weight parts alcohol dissolubility resol carries out modification, obtains resin FH system;
(2) para-amino benzoic acid with 10 weight parts carries out modification to above-mentioned resin system in the time of 60～110 ℃, gets wetting ability FH resin system:
(3) in above-mentioned wetting ability FH resin, add the filler (titanium dioxide of 10 weight parts, the barium titanate of 5 weight parts), pigment (1.2 weight parts are common soft black), 1.5 weight part nanometer titanium dioxides and flow agent (the fluorine-carbon modified polyether silicone oil of 0.5 weight part), fully stir with homogenizer, use sand mill that compound is fully ground, re-use the distilled water of homogenizer interpolation 40 weight parts in the compound; Get protective system 3 of the present invention.
Embodiment 4
A kind of preparation method of nano aqueous protective system, its steps in sequence is:
(1) be solvent with the many ether of ethylene glycol in the time of 40～90 ℃, the E-9 Resins, epoxy that adds 60 weight parts with 25 weight part soluble phenolic resins carries out modification, obtains resin FH system;
(2) para-amino benzoic acid with 10 weight parts carries out modification to above-mentioned resin system in the time of 60～110 ℃, gets wetting ability FH resin system;
(3) in above-mentioned wetting ability FH resin, add the filler (titanium dioxide of 10 weight parts, the pure aluminium silicate of 5 weight parts), pigment (1 weight part is common soft black), 1.5 weight part nanometer titanium dioxides and flow agent (the fluorine-carbon modified polyether silicone oil of 0.5 weight part), fully stir with homogenizer, use sand mill that compound is fully ground, re-use the distilled water of homogenizer interpolation 35 weight parts in the compound; Get protective system 4 of the present invention.
Embodiment 5
A kind of preparation method of nano aqueous protective system, its steps in sequence is:
(1) be solvent with the ethylene glycol monoethyl ether in the time of 40～90 ℃, the E-44 Resins, epoxy that adds 65 weight parts with 20 weight part soluble phenolic resins carries out modification, obtains resin FH system;
(2) para-amino benzoic acid with 10 weight parts carries out modification to above-mentioned resin system in the time of 60～110 ℃, gets wetting ability FH resin system;
(3) in above-mentioned modification FH resin, add the filler (titanium dioxide of 10 weight parts, the kaolin of 5 weight parts), pigment (1.5 weight part nanometer iron oxide red), 1.5 weight part nanometer titanium dioxides and flow agent (the fluorine-carbon modified polyether silicone oil of 0.5 weight part), fully stir with homogenizer, use sand mill that compound is fully ground, re-use the distilled water of homogenizer interpolation 35 weight parts in the compound; Get protective system 5 of the present invention.
Use packaging process to do in the scatterer anticorrosion gained protective system of the present invention.
Adopt at present general High Temperature High Pressure alkaline water corrosion of in scatterer corrosion-resistant field and dynamic loop quicken the analog detection method test film to the interior antiseptic property of steel radiator (80 ℃, pH 〉=12, flow velocity ≈ 10m/s, time 〉=120h).The result is as follows:
| Protective system | Coating 1 | Coating 2 | Coating 3 | Coating 4 | Coating 5 | Contrast coating |
| Test period and result | 300 hours test back no changes | 300 hours test back no changes | 300 hours test back no changes | 300 hours test back no changes | 300 hours test back no changes | Coating begins to come off after 200 hours |
| Sticking power after the test in 120 hours | 1 grade | 1 grade | 1 grade | 1 grade | 1 grade | 3 grades |
As seen from table, protective system of the present invention is compared with existing protective system, and its over-all properties improves a lot.
Claims (6)
1, a kind of water-based anticorrosive paint is characterized in that comprising by following raw material components: Resins, epoxy, resol, extraordinary silicone oil or para-amino benzoic acid, filler, nano dye or common pigments, nanometer titanium dioxide also have resin solvent and water solvent.
2, protective system according to claim 1, it is characterized in that comprising the extraordinary silicone oil of resol, 5～15 weight parts of 30～50 parts by weight of epoxy resin, 10～20 weight parts or para-amino benzoic acid, 10～20 weight part fillers, 1～3 weight part nano dye or common pigments, 1～3 weight part nanometer titanium dioxide, the alcohol ether type organic of 5～10 weight parts, the distilled water of 25～40 weight parts are lower than the auxiliary agent of 1 weight part in addition.
3, protective system according to claim 1 and 2 is characterized in that: described Resins, epoxy is E-51, E-44, E-20; Described resol is pure dissolubility resol; Described filler is a titanium dioxide, and barium titanate powder, nanometer titanium white, described pigment are nanometer iron oxide red or soft black; Described auxiliary agent is fluorine-carbon modified polyether silicone oil or water-soluble fluorine carbon resin.
4, a kind of preparation method of protective system, its steps in sequence is:
(1) is solvent with the alcohol ether type organic, Resins, epoxy carried out modification, obtain modified resin FH with resol;
(2) be solvent with the alcohol ether type organic, the FH resin carried out modification, get modification FH resin with para-amino benzoic acid or extraordinary silicone oil;
(3) in above-mentioned modification FH resin, add filler, nano dye, nanometer titanium dioxide, stir, grind, get compound;
(4) in above-mentioned compound, add distilled water while stirring, transfer to needed viscosity.
5, the preparation method of protective system according to claim 4 is characterized in that:
(1) in the time of 40～90 ℃, is solvent, 30～50 parts by weight of epoxy resin carried out modification, obtain modified resin FH with 10～20 weight part resol with the alcohol ether type organic;
(2) in the time of 60～110 ℃, be solvent, the FH resin carried out modification with the para-amino benzoic acid or the extraordinary silicone oil of 5～15 weight parts with the alcohol ether type organic, modification FH resin;
(3) in above-mentioned modification FH resin, add 10～30 weight part fillers, 1～3 weight part nano dye, 1-3 weight part nanometer titanium dioxide and 0.5～1 weight part auxiliary agent, stir, grind, get compound;
(4) in above-mentioned compound, add the distilled water of 15～35 weight parts while stirring, transfer to needed viscosity.
6, protective system according to claim 5 is characterized in that: described Resins, epoxy is E-51, E-44, E-20; Described resol is pure dissolubility resol; Described filler is a titanium dioxide, and barium titanate powder, nanometer titanium white, described pigment are nanometer iron oxide red or soft black; Described auxiliary agent is water-soluble fluorine carbon resin, fluorine-carbon modified polyether silicone oil.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100839450A CN100430449C (en) | 2004-10-13 | 2004-10-13 | Water anti-corrosion paint and its preparing method |
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| CNB2004100839450A CN100430449C (en) | 2004-10-13 | 2004-10-13 | Water anti-corrosion paint and its preparing method |
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| CN1616567A true CN1616567A (en) | 2005-05-18 |
| CN100430449C CN100430449C (en) | 2008-11-05 |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100419035C (en) * | 2006-07-12 | 2008-09-17 | 山东省科学院新材料研究所 | Anticorrosive pipeline paint and its prepn |
| CN101096465B (en) * | 2006-06-29 | 2010-06-09 | 彭文表 | Aqueous long-acting anticorrosion paint and preparation method thereof |
| CN103013288A (en) * | 2012-11-28 | 2013-04-03 | 天长市开林化工有限公司 | Acid and alkali resistant epoxy phenolic aldehyde inner wall coating |
| CN104592853A (en) * | 2014-12-10 | 2015-05-06 | 成都拜迪新材料有限公司 | Preparation method for water-based phenolic red lead rusted antirust primer |
| CN104774523A (en) * | 2015-04-22 | 2015-07-15 | 陈曦 | Novel corrosion-resistant nano composite paint and preparation method thereof |
| CN106243926A (en) * | 2016-08-25 | 2016-12-21 | 无锡卡秀堡辉涂料有限公司 | A kind of water-base epoxy phenolic aldehyde combination high-temperature resistant coating |
| CN106854416A (en) * | 2016-12-18 | 2017-06-16 | 钦州市科学技术开发中心 | A kind of epoxy coating and preparation method |
| CN107502134A (en) * | 2017-08-15 | 2017-12-22 | 合肥卓立雅工程材料科技有限公司 | For metro shield section of jurisdiction anti-corrosive and waterproof paint and preparation method thereof |
| CN108707423A (en) * | 2018-06-21 | 2018-10-26 | 天津市津海特种涂料装饰有限公司 | A kind of waterborne anti-corrosive primer |
| CN108912961A (en) * | 2018-07-18 | 2018-11-30 | 合肥择浚电气设备有限公司 | A kind of power distribution cabinet shell Special heat dissipating paint and preparation method thereof |
| CN116333561A (en) * | 2023-04-17 | 2023-06-27 | 益帆涂料(无锡)有限公司 | Environment-friendly epoxy anti-corrosion paint and preparation method thereof |
| CN116554758A (en) * | 2023-05-24 | 2023-08-08 | 上海固密特新材料科技有限公司 | Fluorine modified high polymer roughening-reducing protective coating suitable for hydraulic building |
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| US5137067A (en) * | 1991-12-16 | 1992-08-11 | Jw Aluminum Company | Hydrophilic and corrosion resistant fins for a heat exchanger |
| CN1076948A (en) * | 1993-06-01 | 1993-10-06 | 北京市奥飞达科技公司 | Water-based anticorrosive paint and preparation method thereof |
| JP3659370B2 (en) * | 1996-12-27 | 2005-06-15 | 日立化成工業株式会社 | Water-dispersed resin composition, process for producing the same, and paint using the same |
| CN1190111A (en) * | 1998-03-20 | 1998-08-12 | 王贺成 | Multifunctional waterproof anticorrosive paint and its preparation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101096465B (en) * | 2006-06-29 | 2010-06-09 | 彭文表 | Aqueous long-acting anticorrosion paint and preparation method thereof |
| CN100419035C (en) * | 2006-07-12 | 2008-09-17 | 山东省科学院新材料研究所 | Anticorrosive pipeline paint and its prepn |
| CN103013288A (en) * | 2012-11-28 | 2013-04-03 | 天长市开林化工有限公司 | Acid and alkali resistant epoxy phenolic aldehyde inner wall coating |
| CN104592853A (en) * | 2014-12-10 | 2015-05-06 | 成都拜迪新材料有限公司 | Preparation method for water-based phenolic red lead rusted antirust primer |
| CN104774523A (en) * | 2015-04-22 | 2015-07-15 | 陈曦 | Novel corrosion-resistant nano composite paint and preparation method thereof |
| CN106243926B (en) * | 2016-08-25 | 2018-04-17 | 无锡卡秀堡辉涂料有限公司 | A kind of water-base epoxy phenolic aldehyde combines high-temperature resistant coating |
| CN106243926A (en) * | 2016-08-25 | 2016-12-21 | 无锡卡秀堡辉涂料有限公司 | A kind of water-base epoxy phenolic aldehyde combination high-temperature resistant coating |
| CN106854416A (en) * | 2016-12-18 | 2017-06-16 | 钦州市科学技术开发中心 | A kind of epoxy coating and preparation method |
| CN107502134A (en) * | 2017-08-15 | 2017-12-22 | 合肥卓立雅工程材料科技有限公司 | For metro shield section of jurisdiction anti-corrosive and waterproof paint and preparation method thereof |
| CN108707423A (en) * | 2018-06-21 | 2018-10-26 | 天津市津海特种涂料装饰有限公司 | A kind of waterborne anti-corrosive primer |
| CN108912961A (en) * | 2018-07-18 | 2018-11-30 | 合肥择浚电气设备有限公司 | A kind of power distribution cabinet shell Special heat dissipating paint and preparation method thereof |
| CN116333561A (en) * | 2023-04-17 | 2023-06-27 | 益帆涂料(无锡)有限公司 | Environment-friendly epoxy anti-corrosion paint and preparation method thereof |
| CN116554758A (en) * | 2023-05-24 | 2023-08-08 | 上海固密特新材料科技有限公司 | Fluorine modified high polymer roughening-reducing protective coating suitable for hydraulic building |
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