CN102993929A - Epoxy-modified spray polyurea anticorrosive paint for surface of steel structure and preparation and using method of paint - Google Patents

Epoxy-modified spray polyurea anticorrosive paint for surface of steel structure and preparation and using method of paint Download PDF

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CN102993929A
CN102993929A CN2012103760680A CN201210376068A CN102993929A CN 102993929 A CN102993929 A CN 102993929A CN 2012103760680 A CN2012103760680 A CN 2012103760680A CN 201210376068 A CN201210376068 A CN 201210376068A CN 102993929 A CN102993929 A CN 102993929A
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steel structure
weight part
protective system
structure surface
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CN102993929B (en
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刘子康
王新锋
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Beijing Oriental Yuhong Waterproof Technology Co Ltd
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Beijing Oriental Yuhong Waterproof Technology Co Ltd
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Abstract

The invention discloses an epoxy-modified spray polyurea anticorrosive paint for the surface of a steel structure. The paint is a bi-component paint composed of a component A and a component B, and is molded by on-site spraying, wherein the component A is a semi-prepolymer formed by reaction of 30-50 weight parts of polyisocyanate and 20-40 weight parts of polyether polyol, and 20-30 weight parts of epoxy resin, and 0-10 weight parts of a diluting agent; the component B is composed of the following raw materials in parts by weight: 35-50 parts of amine-terminated polyether, 20-30 parts of liquid amine chain extender, 10-20 parts of anticorrosive filler and 0-5 parts of assistant. According to the invention, the epoxy-modified spray polyurea anticorrosive paint can be sprayed on the surface of the basic layer by spraying equipment after being rapidly mixed, and then is quickly reacted and solidified to be coating with strong adhesive force and toughness; and the coating has the advantages of strong adhesive force, high rigidity, and good anticorrosion resistance, abrasive resistance and solvent resistance.

Description

A kind of epoxide modified spray polyurea protective system and preparation and application thereof for steel structure surface
Technical field
The present invention relates to a kind of epoxide modified spray polyurea protective system for steel structure surface, belong to the impregnating material field.
Background technology
The metallic corrosion meeting brings about great losses, but no matter now and even in the future, metallic substance all occupies critical role with its good machinery and processing performance at Material Field, therefore study the corrosion of metal means of defence with the control corrosion of metal, reduce the loss that corrosion causes, significant to the national economic development.Wherein the most frequently used method is exactly to apply corrosion protection coating in the metallic surface, contacts with metallic matrix with isolated corrosive medium.Development along with industries such as building, traffic, petrochemical industry, electric power, the market scale of protective system is only second to building coating and occupies second, 2020 cars will be broken through 1,000,000 tons of high pointes according to estimates, have higher requirement to kind and the performance of protective system in these fields.
Existing scheme all exists following shortcoming such as traditional epoxy anticorrosion material: the 1. hardness toughness deficiency of having a surplus, and very easily produce tiny crack in use and preservative effect is reduced greatly, cause repairing and upkeep cost increases; 2. be difficult in vertical surface or end face construction; 3. system contains organic solvent, harmful and contaminate environment; 4. must adopt the multiple tracks construction, long construction period, efficient is low.
Summary of the invention
For the defective of prior art, the invention provides a kind of epoxide modified spray polyurea protective system for steel structure surface, show excellent performance behind this paint solidification, have extremely strong sticking power, high rigidity, anticorrosion and wear resistance, anti-solvent etc.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of epoxide modified spray polyurea protective system for steel structure surface, the two-component coating that consists of for the A component of in-situ spraying moulding and B component, wherein the A component by polyisocyanates, polyether glycol and Resins, epoxy reaction semi prepolymer and thinner form; The B component is comprised of Amino Terminated polyether(ATPE), liquid amine chainextender, anticorrosive packing and auxiliary agent, and wherein each composition weight umber is as follows:
The semi prepolymer that the A component is got by 30~50 weight part polyisocyanates, 20~40 weight part polyether glycols and the reaction of 20~30 weight part Resins, epoxy and 0~10 part thinner form;
The B component is comprised of 35~50 weight part Amino Terminated polyether(ATPE)s, 20~30 weight part liquid amine chainextenders, 10~20 weight part anticorrosive packings and 0~5 weight part auxiliary agent.
Accordingly, on the basis of the above, the invention discloses the preparation method of described epoxide modified spray polyurea protective system for steel structure surface:
The preparation method of A component: polyether glycol, Resins, epoxy and thinner adding are had in the reactor of nitrogen protection, under agitation be heated to 100~120 ℃, constant temperature is evacuated to the above dehydration of still internal pressure-0.095MPa 3 hours, close the polyisocyanates of vacuum cool-down to 50~60 ℃ adding respective amount, be heated to 70~90 ℃ of reactions 3 hours, free isocyanate group content is cooled to 40~60 ℃ between 10%~20% the time, discharging and getting;
The preparation method of described B component: first ending amino polyether is joined in the reactor, then stir lower the adding under the dispersing auxiliary low rate mixing after auxiliary agent is uniformly dispersed, add amine chainextender, high-speed stirring is after 0.5~1 hour behind the anticorrosive packing, add other auxiliary agents and mix, discharging after filtering with 200 eye mesh screens.
Above preparation method only is the preparation method of optimum of the present invention; and unrestricted the present invention only can adopt aforesaid method to make; those skilled in the art change Heating temperature, vacuum tightness, reaction times etc. on the basis of the above can't change essence of the present invention; just affect accordingly preparation speed and the productive rate of product, this change is covered by within the protection domain of the present invention.
Further, the invention also discloses the using method of described epoxide modified spray polyurea protective system for steel structure surface, two components are carried out spraying application according to 1: 1 ratio of volume ratio, adopt spraying machine and spray gun to carry out spraying application.
Wherein, spraying equipment can use H-3500 or H-20/35 main frame and GX-7 or the GX-8 spray gun of the U.S. Gusmer company during construction, the MX/MH main frame of Glas-Craft company and Probler spray gun, the H-XP3 main frame of Graco company or E-XP2 main frame and Fusion MP or Fusion AP spray gun etc., the present invention does not limit concrete used device type and model.
It should be noted that, the applicant has used the such numerical expression scope of 0-x when the consumption of statement auxiliary agent, thinner in the present invention, it is the restriction that is subject to the upper limit for the consumption of expressing specific examples of such components, can play corresponding function as long as in composition, add this component, and non-limiting specific minimum value, namely the concept that will express of applicant is not contain 0 value.
Of the present invention be described in further detail with implementation in; the invention discloses the preferred type of used various compositions; so that better, clearer explanation the present invention; yet this detailed description does not consist of special restriction of the present invention; do not rely on these detailed information and adopt other general chemical materials of the technology of the present invention field; as long as it meets the above-mentioned restriction that each moiety title is done of the present invention, still belong to protection scope of the present invention.
In the present invention, described polyisocyanates is selected from tolylene diisocyanate, diphenylmethanediisocyanate, the aromatic polyisocyanate of polymethine polyphenyl polyisocyanate; Or be selected from the aliphatic polyisocyante of cyclohexyl diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate; Or its mixture.Diphenylmethanediisocyanate preferably, described diphenylmethanediisocyanate is selected from 4,4 '-diphenylmethanediisocyanate, 4 of carbodiimide-uretonimine-modified, 4 '-diphenylmethanediisocyanate, 4 of high 2,4 content of isomer, a kind of in 4 '-diphenylmethanediisocyanate and/or more than one mixture.
In the present invention, described polyether glycol is selected from a kind of in polyglycol ether, polypropylene glycol ether, polyglycerol ether, the polypentaerythritol ether and/or more than one mixture, the functionality of preferred polyether glycol is 2~4, the hydroxyl value equivalent is at least 500, more preferably between 1000~3000.
In the present invention, described Resins, epoxy is selected from a kind of in bisphenol A type epoxy resin, the bisphenol f type epoxy resin and/or more than one mixture, and preferred its oxirane value of Resins, epoxy is at least 0.12.
In the present invention, described Amino Terminated polyether(ATPE) is selected from a kind of in the amino polypropylene glycol ether of end amino polyglycol ether, end, the amino polyglycerol ether of end, the amino polypentaerythritol ether of end and/or more than one mixture, the functionality of preferred Amino Terminated polyether(ATPE) is 2~4, the worthwhile amount of amine is at least 100, more preferably between 200~1600.
In the present invention, described amine chain extender is selected from diethyl toluene diamine, dimethythiotoluene diamine, N, N '-dialkyl methyl pentanoic, 4,4 '-diaminodiphenyl-methane, 3,3 '-two chloro-4,4 '-diaminodiphenyl-methane, a kind of in the aliphatic category chainextender and/or more than one mixture.
In the present invention, the described anticorrosive packing of B component is selected from a kind of in iron mica, zinc phosphate, aluminum phosphate, talcum powder, organobentonite, the titanium dioxide and/or more than one mixture.
Further, in coating of the present invention, described B component can comprise that also auxiliary agent is to improve the multiple performance of coating, for example:
In the B component, can add the auxiliary agents such as oxidation inhibitor, ultraviolet absorbers, FLOW IMPROVERS as required, the present invention does not make the kind of auxiliary agent and being particularly limited, anti-oxidant Irganox 1010 and 1076 (CIBAGEIGY company) for example, (YOSHITOM SEIYAKU companies) such as Yoshinox BHT, BB, GSY-930, ultraviolet absorbers TinuvinP327,328, B97 (CIBAGEIGY company) etc., preferably, the consumption of this analog assistant is 0.2~2 weight part of B component total amount.
Epoxide modified spray polyurea protective system for steel structure surface of the present invention has been taken into account the composite factors such as the viscosity of sticking power to base material, system and antiseptic property, is mainly reflected in following three aspects:
The first spray polyurea protective system requires the sticking power of steel substrate as far as possible high, introduces in the system that Resins, epoxy increases the hardness of filming and to the sticking power of base material;
The ratio that the second spray polyurea protective system is set two components is 1: 1, is 1: 1 relatively difficulty that becomes and may cause resize ratio behind the introducing anticorrosive packing, and the formulating of recipe difficulty is strengthened; And affected the viscosity of system, if deal with improperly can cause mixing uneven;
The spraying coating process that is added in to a certain extent material of the 3rd anticorrosive packing has disadvantageous effect, therefore the overall equilbrium that fully takes into account Combination, spraying coating process and antiseptic property for the epoxide modified spray polyurea protective system of steel structure surface of the present invention, thereby determined above-mentioned best the composition, reached following several technique effect: addition little and and coating hardness improved remarkably influenced arranged: good with the compatibility of raw material; Viscosity influence to base-material is little, operability good; Nontoxic or toxicity is little; Excellent storage stability after in system has preferably practicality and economy.
Field of using for the epoxide modified spray polyurea protective system of steel structure surface of the present invention comprises oceanographic engineering, bridge, station, airport, petrochemical complex, port and pier, mechanical means, field of wind power generation, effectively solved the difficult problem that traditional material causes, have long, pollution-free, not sagging, the construction characteristics such as fast of life-span, the polyurea anti-corrosion coating of spray mo(u)lding and the strong adhesion of steel substrate, and snappiness is good, hardness is high, and shielding isolation preservative effect is splendid.
The applicant has carried out a large amount of experimental tests, and the epoxide modified spray polyurea protective system that the proved invention is used for steel structure surface has following significant performance advantage:
One, curing speed is fast, generally solidifies rapidly being lower than in time of 10~20 seconds, and interlayer construction interval only needs several minutes, such as the thick coating of construction 600m2/1.0mm, only needs 4 hours can finish construction, can come into operation in 1~2 hour.
Two, 100% solid content, as long as no matter correct the use is construction period, or after material came into operation, coating did not all produce objectionable impurities and irritating smell.
Three, show excellent over-all properties after the curing, such as extremely strong sticking power, high rigidity, anticorrosion and wear resistance, anti-solvent etc.
Embodiment
The invention spirit that can better understand the present invention in conjunction with specific embodiments; in following enforcement; provide that the present invention is some preferred embodiment to be formed with material; yet the present invention is not limited in and adopts following manner to implement, and the change that those skilled in the art carry out the present invention on the basis of understanding invention essence of the present invention, replacement, improvement etc. still belong to protection scope of the present invention.
In the following embodiments, each raw material all can be from market purchasing, for example:
MDI-MI 4,4 '-diphenylmethanediisocyanate (German BASF AG makes)
T-5000, D-2000 Amino Terminated polyether(ATPE) (German BASF AG makes)
DETDA diethyl toluene diamine (manufacturing of U.S. Albemarle company)
DMTDA dimethythiotoluene diamine (manufacturing of U.S. Albemarle company)
MDI-100 4,4 '-diphenylmethanediisocyanate (Yantai Synthetic Leather Factory's manufacturing)
E-44, E-51 bisphenol A type epoxy resin (Shanghai Resin Factory's manufacturing)
Embodiment 1
Be that 500 polyether Glycols and 30 weight part epoxy resin E-44s add and fill in the reactor of nitrogen with 40 weight part equivalents, heat to (105~115) ℃, constant temperature is evacuated to the above dehydration of still internal pressure-0.095MPa 3 hours, close vacuum cool-down to (50~60) and ℃ add 30 weight part MDI-MI, be heated to (70~90) ℃ reaction 3 hours, be cooled to (50~60) ℃ discharging and be the A component.The B component is that the dispersion agent by 7 weight part T-5000,33 weight part D-2000,22 weight part DETDA, 8 weight part DMTDA, 15 weight part iron micas, 13 parts by weight of titanium dioxide and 2 weight parts mixes in reactor and makes.
During use, A, B component H-XP3 main frame or E-XP2 main frame and the Fusion MP spray gun by U.S. Graco company forms polyurea elastomer by 1: 1 (volume ratio) spraying.Be suitable for the pipeline corrosion protection engineering.The Main physical performance of this polyurea elastomer is described in table 1 below:
The Main physical performance of table 1 polyurea elastomer
Project Index
Gel time 10 seconds
Tensile strength 15MPa
Elongation at break 300%
Tear strength 60KN/m
Hardness, Shao D 70
Salt fog resistance (1500h) Come off without foaming, non-corroding, nothing
Acid resistance (30% sulfuric acid, 30 days) Come off without foaming, non-corroding, nothing
Alkali resistance (30% sodium hydroxide, 30 days) Come off without foaming, non-corroding, nothing
Resistance to salt water (20% sodium-chlor, 30 days) Come off without foaming, non-corroding, nothing
Embodiment 2
Be that 1000 polyether-tribasic alcohol and 30 weight part Resins, epoxy E-51 and 5 parts by weight diluent DOP add and fill in the reactor of nitrogen with 30 weight part equivalents, heat to (105~115) ℃, constant temperature is evacuated to the above dehydration of still internal pressure-0.095MPa 3 hours, close vacuum cool-down to (50~60) ℃ adding 35 weight part MDI-100, heating (70~90) ℃ reaction 3 hours is cooled to (50~60) ℃ discharging and is the A component.The B component is that the dispersion agent by the organobentonite of the aluminum phosphate of 30 weight part T-5000,18 weight part D-2000,20 weight part DETDA, 10 weight parts, 10 weight parts and 2 weight parts mixes in reactor and makes.
During use, A, B component H-XP3 main frame or E-XP2 main frame and the Fusion MP spray gun by U.S. Graco company forms polyurea elastomer by 1: 1 (volume ratio) spraying.Be suitable for construction steel structure bridge antiseptic project.It is 2 described that the Main physical performance of this polyurea elastomer sees Table.
The Main physical performance of table 2 polyurea elastomer
Project Index
Gel time 5 seconds
Tensile strength 16MPa
Elongation at break 300%
Tear strength 55KN/m
Hardness, Shao D 65
Salt fog resistance (2000h) Come off without foaming, non-corroding, nothing
Acid resistance (30% sulfuric acid, 30 days) Come off without foaming, non-corroding, nothing
Alkali resistance (30% sodium hydroxide, 30 days) Come off without foaming, non-corroding, nothing
Resistance to salt water (20% sodium-chlor, 30 days) Come off without foaming, non-corroding, nothing
Embodiment 3
Be that the thinner DOP of 1000 polyether Glycols and 20 weight part Resins, epoxy E-20 and 10 weight parts adds and fills in the reactor of nitrogen with 20 weight part equivalents, add and fill in the reactor of nitrogen, heat to (105~115) ℃, constant temperature is evacuated to the above dehydration of still internal pressure-0.095MPa 3 hours, close vacuum cool-down to (50~60) ℃ adding 50 weight part MDI-100, be heated to (70~90) ℃ reaction 3 hours, be cooled to (50~60) ℃ discharging and be the A component.The B component is that the dispersion agent by the zinc phosphate of 23 weight part T-5000,35 weight part D-2000,18 weight part DETDA, 12 weight part DMTDA, 10 weight parts and 2 weight parts mixes in reactor and makes.
During use, A, B component H-XP3 main frame or E-XP2 main frame and the Fusion MP spray gun by U.S. Graco company forms polyurea elastomer by 1: 1 (volume ratio) spraying.The antiseptic project that is suitable for the harbour engineering steel construction.It is 3 described that the Main physical performance of this polyurea elastomer sees Table:
The Main physical performance of table 3 polyurea elastomer
Project Index
Gel time 10 seconds
Tensile strength 17MPa
Elongation at break 300%
Tear strength 50KN/m
Hardness, Shao D 70
Salt fog resistance (2000h) Come off without foaming, non-corroding, nothing
Acid resistance (30% sulfuric acid, 30 days) Come off without foaming, non-corroding, nothing
Alkali resistance (30% sodium hydroxide, 30 days) Come off without foaming, non-corroding, nothing
Resistance to salt water (20% sodium-chlor, 30 days) Come off without foaming, non-corroding, nothing
The comparative example 1
Be that the thinner DOP of 1000 polyether Glycols and 10 weight parts adds and fills in the reactor of nitrogen with 40 weight part equivalents, heat to (105~115) ℃, constant temperature is evacuated to the above dehydration of still internal pressure-0.095MPa 3 hours, close vacuum cool-down to (50~60) ℃ adding 50 weight part MDI-100, be heated to (70~90) ℃ reaction 3 hours, be cooled to (50~60) ℃ discharging and be the A component.The B component is to be mixed in reactor and made by 38 weight part T-5000,26 weight part D-2000,36 weight part DETDA.
During use, A, B component H-XP3 main frame or E-XP2 main frame and the Fusion MP spray gun by U.S. Graco company forms polyurea elastomer by 1: 1 (volume ratio) spraying.It is 4 described that the Main physical performance of this polyurea elastomer sees Table
The Main physical performance of table 4 polyurea elastomer
Project Index
Gel time 10 seconds
Tensile strength 14MPa
Elongation at break 370%
Tear strength 48KN/m
Hardness, Shao D 40
Salt fog resistance (2000h) Local foaming, steel plate pittingpiston,
Acid resistance (30% sulfuric acid, 30 days) Local foaming, steel plate pittingpiston,
Alkali resistance (30% sodium hydroxide, 30 days) Local foaming, steel plate pittingpiston,
Resistance to salt water (20% sodium-chlor, 30 days) Local foaming, steel plate pittingpiston,
Can be found out that by above-mentioned experimental data coating of the present invention is all good by properties under described composition, satisfies application demand.

Claims (10)

1. epoxide modified spray polyurea protective system that is used for steel structure surface, it is the two-component coating that is consisted of by A component and B component, the in-situ spraying moulding, it is characterized in that semi prepolymer and thinner that described A component is got by polyisocyanates, polyether glycol and Resins, epoxy reaction form; Described B component is comprised of Amino Terminated polyether(ATPE), liquid amine chainextender, anticorrosive packing and auxiliary agent, and wherein each composition weight umber is as follows:
The semi prepolymer that the A component is got by 30~50 weight part polyisocyanates, 20~40 weight part polyether glycols and the reaction of 20~30 weight part Resins, epoxy and 0~10 part thinner form;
The B component is comprised of 35~50 weight part Amino Terminated polyether(ATPE)s, 20~30 weight part liquid amine chainextenders, 10~20 weight part anticorrosive packings and 0~5 weight part auxiliary agent.
2. the epoxide modified spray polyurea protective system for steel structure surface according to claim 1, it is characterized in that, described polyisocyanates is selected from tolylene diisocyanate, diphenylmethanediisocyanate, the aromatic polyisocyanate of polymethine polyphenyl polyisocyanate; Or be selected from the aliphatic polyisocyante of cyclohexyl diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate; Or more than one mixture wherein.
3. the epoxide modified spray polyurea protective system for steel structure surface according to claim 2, it is characterized in that, described polyisocyanates is diphenylmethanediisocyanate, described diphenylmethanediisocyanate is selected from 4,4 '-diphenylmethanediisocyanate, 4 of carbodiimide-uretonimine-modified, 4 '-diphenylmethanediisocyanate, 4 of high 2,4 content of isomer, a kind of in 4 '-diphenylmethanediisocyanate and/or more than one mixture.
4. the epoxide modified spray polyurea protective system for steel structure surface according to claim 1, it is characterized in that, described polyether glycol is selected from a kind of in polyglycol ether, polypropylene glycol ether, polyglycerol ether, the polypentaerythritol ether and/or more than one mixture, wherein functionality is 2~4, and the hydroxyl value equivalent is at least 500.
5. the epoxide modified spray polyurea protective system for steel structure surface according to claim 1, it is characterized in that, described Resins, epoxy is selected from a kind of in bisphenol A type epoxy resin, the bisphenol f type epoxy resin and/or more than one mixture, and its oxirane value is at least 0.12.
6. the epoxide modified spray polyurea protective system for steel structure surface according to claim 1, it is characterized in that, described Amino Terminated polyether(ATPE) is selected from a kind of in the amino polypropylene glycol ether of end amino polyglycol ether, end, the amino polyglycerol ether of end, the amino polypentaerythritol ether of end and/or more than one mixture, wherein functionality is 2~4, and the worthwhile amount of amine is at least 100.
7. the epoxide modified spray polyurea protective system for steel structure surface according to claim 1, it is characterized in that, described amine chain extender is selected from diethyl toluene diamine, dimethythiotoluene diamine, N, N '-dialkyl methyl pentanoic, 4,4 '-diaminodiphenyl-methane, 3,3 '-two chloro-4,4 '-diaminodiphenyl-methane, a kind of in the aliphatic category chainextender and/or more than one mixture.
8. the epoxide modified spray polyurea protective system for steel structure surface according to claim 1, it is characterized in that described anticorrosive packing is selected from a kind of in iron mica, zinc phosphate, aluminum phosphate, talcum powder, organobentonite, the titanium dioxide and/or more than one mixture.
9. a preparation method who is used for the epoxide modified spray polyurea protective system of steel structure surface is characterized in that,
The preparation method of described A component: polyether glycol, Resins, epoxy and thinner adding are had in the reactor of nitrogen protection, under agitation be heated to 100~120 ℃, constant temperature is evacuated to the above dehydration of still internal pressure-0.095MPa 3 hours, close the polyisocyanates of vacuum cool-down to 50~60 ℃ adding respective amount, be heated to 70~90 ℃ of reactions 3 hours, free isocyanate group content is cooled to 40~60 ℃ between 10%~20% the time, discharging and getting;
The preparation method of described B component: first ending amino polyether is joined in the reactor, then stir lower the adding under the dispersing auxiliary low rate mixing after auxiliary agent is uniformly dispersed, add amine chainextender, high-speed stirring is after 0.5~1 hour behind the anticorrosive packing, add other auxiliary agents and mix, discharging after filtering with 200 eye mesh screens.
10. a using method that is used for the epoxide modified spray polyurea protective system of steel structure surface is characterized in that, two components are carried out spraying application according to 1: 1 ratio of volume ratio, adopts spraying machine and spray gun to spray.
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CN103304761A (en) * 2013-05-27 2013-09-18 广州市台实防水补强有限公司 Polyurea and preparation method thereof
CN103740247A (en) * 2014-01-07 2014-04-23 海洋化工研究院有限公司 Spray polyurea elastomer applied to marine drilling platform corrosion prevention as well as preparation method and construction method thereof
CN103740247B (en) * 2014-01-07 2015-12-30 海洋化工研究院有限公司 Be applied to marine drilling platform rot-resistant Spray Polyurea Elastomer and preparation method thereof and constructional method
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CN104830050A (en) * 2015-05-08 2015-08-12 天津昌海化工科技发展有限公司 Weatherproof corrosion-resistant steel strand coated material and preparation method thereof
CN105038544A (en) * 2015-06-29 2015-11-11 芜湖县双宝建材有限公司 Glass flake modified polyurea coating
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CN112280448A (en) * 2020-10-28 2021-01-29 中国石油化工集团有限公司 Anticorrosive polyurea coating for petrochemical industry and preparation method thereof
CN112280448B (en) * 2020-10-28 2021-11-12 中国石油化工集团有限公司 Anticorrosive polyurea coating for petrochemical industry and preparation method thereof
CN115124916A (en) * 2022-08-17 2022-09-30 河南永科智能电力设备有限公司 Insulating moisture-proof durable paint, manufacturing method and using method
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