CN102993929B - A kind of epoxide modified spray polyurea protective system for steel structure surface and preparation and application thereof - Google Patents

A kind of epoxide modified spray polyurea protective system for steel structure surface and preparation and application thereof Download PDF

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CN102993929B
CN102993929B CN201210376068.0A CN201210376068A CN102993929B CN 102993929 B CN102993929 B CN 102993929B CN 201210376068 A CN201210376068 A CN 201210376068A CN 102993929 B CN102993929 B CN 102993929B
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steel structure
protective system
structure surface
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CN102993929A (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 a kind of epoxide modified spray polyurea protective system for steel structure surface, it is the two-component coating be made up of component A and B component, in-situ spraying is shaping, and wherein said component A is reacted by 30 ~ 50 weight part polyisocyanates, 20 ~ 40 weight part polyether glycols and 20 ~ 30 parts by weight epoxy resin and the thinner of the semi prepolymer that obtains and 0 ~ 10 part forms; B component is made up 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.Epoxide modified spray polyurea protective system for steel structure surface of the present invention, by spraying equipment, after short mix, be sprayed onto substrate surface, rapid reaction consolidation becomes strong adhesion, tough and tensile coating.This coating has the coating of extremely strong sticking power, high rigidity, the anticorrosion and function such as wear resistance, solvent resistant.

Description

A kind of epoxide modified spray polyurea protective system for steel structure surface and preparation and application thereof
Technical field
The present invention relates to a kind of epoxide modified spray polyurea protective system for steel structure surface, belong to impregnating material field.
Background technology
Metallic corrosion can bring about great losses, but no matter now and even in the future, metallic substance all occupies critical role with its excellent machinery and processing performance at Material Field, therefore corrosion of metal means of defence is studied to control corrosion of metal, reduce the loss of corroding and causing, significant to the national economic development.Wherein the most frequently used method is exactly at metallic surface coating corrosion protection coating, contacts with metallic matrix with isolated corrosive medium.Along with the development of the 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 are by breakthrough 1,000,000 tons of high pointes according to estimates, have higher requirement to the kind of protective system and performance in these fields.
Existing scheme, the epoxy anticorrosion material as traditional all also exists following shortcoming: 1. hardness is had a surplus toughness deficiency, very easily produces tiny crack in use and preservative effect is reduced greatly, causes repairing and upkeep cost increases; 2. be difficult in vertical surface or end face construction; 3. system is containing organic solvent, harmful and contaminate environment; 4. multiple tracks must be adopted to construct, and long construction period, efficiency is low.
Summary of the invention
For the defect of prior art, the invention provides a kind of epoxide modified spray polyurea protective system for steel structure surface, show excellent performance after this paint solidification, there is extremely strong sticking power, high rigidity, anticorrosion and wear resistance, solvent resistant 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 the component A shaping for in-situ spraying and B component are formed, wherein component A is reacted by polyisocyanates, polyether glycol and epoxy resin and the semi prepolymer that obtains and thinner form; B component is made up of Amino Terminated polyether(ATPE), liquid amine chainextender, anticorrosive packing and auxiliary agent, and wherein each composition weight number is as follows:
Component A is reacted by 30 ~ 50 weight part polyisocyanates, 20 ~ 40 weight part polyether glycols and 20 ~ 30 parts by weight epoxy resin and the thinner of the semi prepolymer that obtains and 0 ~ 10 part forms;
B component is made up 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 described preparation method for the epoxide modified spray polyurea protective system of steel structure surface:
The preparation method of component A: polyether glycol, epoxy resin and thinner are added and has in the reactor of nitrogen protection, under agitation be heated to 100 ~ 120 DEG C, constant temperature is evacuated to still more than internal pressure-0.095MPa and dewaters 3 hours, close the polyisocyanates that vacuum cool-down to 50 ~ 60 DEG C add respective amount, be heated to 70 ~ 90 DEG C of reactions 3 hours, when free isocyanate group content is between 10% ~ 20%, be cooled to 40 ~ 60 DEG C, discharging and obtaining;
The preparation method of described B component: first ending amino polyether is joined in reactor, then to add under dispersing auxiliary low rate mixing under stirring after auxiliary agent is uniformly dispersed, add amine chainextender, after anticorrosive packing, high-speed stirring is after 0.5 ~ 1 hour, add other auxiliary agents to mix, discharging after filtering with 200 eye mesh screens.
Above preparation method is only 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 carry out change to Heating temperature, vacuum tightness, reaction times etc. on the basis of the above can't change essence of the present invention; just affect preparation speed and the productive rate of product accordingly, this change is covered by within scope.
Further, the invention also discloses the described using method for the epoxide modified spray polyurea protective system of steel structure surface, two components are carried out spraying application according to the ratio of volume ratio 1: 1, adopt spraying machine and spray gun to carry out spraying application.
Wherein, during construction, spraying equipment can use H-3500 or H-20/35 main frame and GX-7 or the GX-8 spray gun of Gusmer company of the U.S., 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 device type specifically used and model.
It should be noted that, applicant employs the such numerical expression scope of 0-x when stating the consumption of auxiliary agent, thinner in the present invention, it is the restriction that consumption for expressing specific examples of such components is subject to the upper limit, as long as add this component can play corresponding function in composition, and non-limiting specific minimum value, the concept that namely applicant will express is not containing 0 value.
Of the present invention be described in further detail and specifically implement in; the invention discloses the preferred type of various compositions used; so that better, clearer explanation the present invention; but this detailed description does not form 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 done each moiety title 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.Preferably diphenylmethanediisocyanate, described diphenylmethanediisocyanate is selected from 4,4 '-diphenylmethanediisocyanate, 4 of carbodiimide-uretonimine-modified, 4 '-diphenylmethanediisocyanate, high by 2,4 of 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, polypentaerythritol ether and/or more than one mixture, the functionality of preferred polyether glycol is 2 ~ 4, hydroxyl value equivalent is at least 500, more preferably between 1000 ~ 3000.
In the present invention, described epoxy resin is selected from a kind of in bisphenol A type epoxy resin, bisphenol f type epoxy resin and/or more than one mixture, and its oxirane value of preferred epoxy resin is at least 0.12.
In the present invention, described Amino Terminated polyether(ATPE) is selected from a kind of in Amino End Group polyglycol ether, Amino End Group polypropylene glycol ether, Amino End Group polyglycerol ether, Amino End Group polypentaerythritol ether 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 aliphatic category chainextender and/or more than one mixture.
In the present invention, the anticorrosive packing described in B component is selected from a kind of in iron mica, zinc phosphate, aluminum phosphate, talcum powder, organobentonite, titanium dioxide and/or more than one mixture.
Further, in coating of the present invention, described B component also can comprise auxiliary agent to improve the multiple performance of coating, such as:
In B component, the auxiliary agents such as oxidation inhibitor, ultraviolet absorbers, FLOW IMPROVERS can be added as required, the present invention does not make the kind of auxiliary agent and being particularly limited to, such as anti-oxidant Irganox 1010 and 1076 (CIBAGEIGY company), Yoshinox BHT, BB, GSY-930 etc. (YOSHITOMSEIYAKU company), 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, take into account composite factors such as the sticking power of base material, the viscosity of system and antiseptic properties, be mainly reflected in following three aspects:
First spray polyurea protective system requires the sticking power of steel substrate as far as possible high, introduces epoxy resin to increase the hardness of film and the sticking power to base material in system;
The ratio that second spray polyurea protective system sets two components is 1: 1, and resize ratio may be caused after introducing anticorrosive packing to be become more difficult at 1: 1, and formulating of recipe difficulty is strengthened; And have impact on the viscosity of system, mixing can be caused uneven if deal with improperly;
Being added in of 3rd anticorrosive packing has disadvantageous effect to the spraying coating process of material to a certain extent, therefore the epoxide modified spray polyurea protective system for steel structure surface of the present invention fully takes into account the overall equilbrium of Combination, spraying coating process and antiseptic property, thus determine above-mentioned the best composition, reach following several technique effect: addition little and and on coating hardness improve have remarkably influenced: good with the compatibility of raw material; Little to the viscosity influence of base-material, operability good; Nontoxic or toxicity is little; Excellent storage stability after in system, has good practicality and economy.
The field of the epoxide modified spray polyurea protective system application for 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, efficiently solve the difficult problem that traditional material causes, there is life-span long, pollution-free, not sagging, the feature such as fast of constructing, 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.
Applicant carried out a large amount of experimental tests, the epoxide modified spray polyurea protective system that proved invention is used for steel structure surface has following significant performance advantage:
One, curing speed is fast, and generally lower than rapid solidification in the time of 10 ~ 20 seconds, interlayer construction interval only needs several minutes, and coating as thick in construction 600m2/1.0mm, only needs within 4 hours, can complete construction, within 1 ~ 2 hour, can come into operation.
Two, as long as no matter 100% solid content, proper use of, is construction period, or after material comes into operation, coating does not all produce objectionable impurities and irritating smell.
Three, excellent over-all properties is shown after solidification, such as extremely strong sticking power, high rigidity, anticorrosion and wear resistance, solvent resistant 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; but the present invention is not limited in the enforcement of employing following manner, those skilled in the art still belong to protection scope of the present invention to change, replacement, improvement etc. that the present invention carries out on the basis understanding invention essence of the present invention.
In the following embodiments, each raw material all can from market purchasing, such as:
MDI-MI 4,4 '-diphenylmethanediisocyanate (BASF Corp. of Germany's manufacture)
T-5000, D-2000 Amino Terminated polyether(ATPE) (BASF Corp. of Germany's manufacture)
DETDA diethyl toluene diamine (manufacture of Albemarle company of the U.S.)
DMTDA dimethythiotoluene diamine (manufacture of Albemarle company of the U.S.)
MDI-100 4,4 '-diphenylmethanediisocyanate (Yantai Synthetic Leather Factory's manufacture)
E-44, E-51 bisphenol A type epoxy resin (Shanghai Resin Factory's manufacture)
Embodiment 1
By 40 weight part equivalents be 500 polyether Glycols and 30 parts by weight epoxy resin E-44 add and fill in the reactor of nitrogen, heat to (105 ~ 115) DEG C, constant temperature is evacuated to still more than internal pressure-0.095MPa and dewaters 3 hours, close vacuum cool-down to (50 ~ 60) DEG C to add 30 weight part MDI-MI, be heated to (70 ~ 90) DEG C reaction 3 hours, be cooled to (50 ~ 60) DEG C discharging and be component A.B component is uniformly mixed in a kettle. by the dispersion agent of 7 weight part T-5000,33 weight part D-2000,22 weight part DETDA, 8 weight part DMTDA, 15 parts by weight mica ferric oxide, 13 parts by weight of titanium dioxide and 2 weight parts to make.
During use, A, B component form polyurea elastomer by the H-XP3 main frame of Graco company of the U.S. or E-XP2 main frame and FusionMP spray gun by 1: 1 (volume ratio) spraying.Be suitable for 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
By 30 weight part equivalents be 1000 polyether-tribasic alcohol and 30 parts by weight epoxy resin E-51 and 5 parts by weight diluent DOP add and fill in the reactor of nitrogen, heat to (105 ~ 115) DEG C, constant temperature is evacuated to still more than internal pressure-0.095MPa and dewaters 3 hours, close vacuum cool-down to (50 ~ 60) DEG C and add 35 weight part MDI-100, heating (70 ~ 90) DEG C reaction 3 hours, is cooled to (50 ~ 60) DEG C discharging and is component A.B component is uniformly mixed in a kettle. by the dispersion agent of 30 weight part T-5000,18 weight part D-2000,20 weight part DETDA, the aluminum phosphate of 10 weight parts, the organobentonite of 10 weight parts and 2 weight parts to make.
During use, A, B component form polyurea elastomer by the H-XP3 main frame of Graco company of the U.S. or E-XP2 main frame and FusionMP spray gun by 1: 1 (volume ratio) spraying.Be suitable for construction steel structure bridge antiseptic project.The Main physical performance of this polyurea elastomer is in described in table 2.
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 polyether Glycols of 1000 and the thinner DOP of 20 parts by weight epoxy resin E-20 and 10 weight parts add and fill in the reactor of nitrogen by 20 weight part equivalents, add and fill in the reactor of nitrogen, heat to (105 ~ 115) DEG C, constant temperature is evacuated to still more than internal pressure-0.095MPa and dewaters 3 hours, close vacuum cool-down to (50 ~ 60) DEG C and add 50 weight part MDI-100, be heated to (70 ~ 90) DEG C reaction 3 hours, be cooled to (50 ~ 60) DEG C discharging and be component A.B component is uniformly mixed in a kettle. by 23 weight part T-5000,35 weight part D-2000,18 weight part DETDA, 12 weight part DMTDA, the zinc phosphate of 10 weight parts and the dispersion agent of 2 weight parts to make.
During use, A, B component form polyurea elastomer by the H-XP3 main frame of Graco company of the U.S. or E-XP2 main frame and FusionMP spray gun by 1: 1 (volume ratio) spraying.Be suitable for the antiseptic project of harbour engineering steel construction.The Main physical performance of this polyurea elastomer is in described in table 3:
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
Comparative example 1
Be that the polyether Glycols of 1000 and the thinner DOP of 10 weight parts add and fill in the reactor of nitrogen by 40 weight part equivalents, heat to (105 ~ 115) DEG C, constant temperature is evacuated to still more than internal pressure-0.095MPa and dewaters 3 hours, close vacuum cool-down to (50 ~ 60) DEG C and add 50 weight part MDI-100, be heated to (70 ~ 90) DEG C reaction 3 hours, be cooled to (50 ~ 60) DEG C discharging and be component A.B component is uniformly mixed in a kettle. is made by 38 weight part T-5000,26 weight part D-2000,36 weight part DETDA.
During use, A, B component form polyurea elastomer by the H-XP3 main frame of Graco company of the U.S. or E-XP2 main frame and FusionMP spray gun by 1: 1 (volume ratio) spraying.The Main physical performance of this polyurea elastomer is in described in table 4
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,
As can be seen from above-mentioned experimental data, coating of the present invention is all good by properties under described composition, meets application demand.

Claims (4)

1. the epoxide modified spray polyurea protective system for steel structure surface, it is the two-component coating be made up of component A and B component, two components carry out spraying application according to the ratio of volume ratio 1: 1, adopt spraying machine and spray gun in-situ spraying shaping, it is characterized in that, the semi prepolymer that described component A is reacted by polyisocyanates, polyether glycol and epoxy resin and obtained and thinner form; Described B component is made up of Amino Terminated polyether(ATPE), liquid amine chainextender, anticorrosive packing and auxiliary agent, and wherein each composition weight number is as follows: component A is reacted by 30 ~ 50 weight part polyisocyanates, 20 ~ 40 weight part polyether glycols and 20 ~ 30 parts by weight epoxy resin and the thinner of the semi prepolymer that obtains and 0 ~ 10 part forms; B component is made up 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; Wherein, 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 wherein multiple mixture; Described polyether glycol is selected from one or more the mixture in polyglycol ether, polypropylene glycol ether, polyglycerol ether, polypentaerythritol ether, and wherein functionality is 2 ~ 4, and hydroxyl value equivalent is at least 500; Described epoxy resin is selected from one or more the mixture in bisphenol A type epoxy resin, bisphenol f type epoxy resin, and its oxirane value is at least 0.12; Described Amino Terminated polyether(ATPE) is selected from one or more the mixture in Amino End Group polyglycol ether, Amino End Group polypropylene glycol ether, Amino End Group polyglycerol ether, Amino End Group polypentaerythritol ether, and wherein functionality is 2 ~ 4, and the worthwhile amount of amine is at least 100; 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, one or more the mixture in aliphatic category chainextender.
2. the epoxide modified spray polyurea protective system for steel structure surface according to claim 1, it is characterized in that, described polyisocyanates is diphenylmethanediisocyanate, described diphenylmethanediisocyanate is selected from 4,4 '-diphenylmethanediisocyanate, 4 of carbodiimide-uretonimine-modified, one or more the mixture in 4 '-diphenylmethanediisocyanate.
3. 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 one or more the mixture in iron mica, zinc phosphate, aluminum phosphate, talcum powder, organobentonite, titanium dioxide.
4. the preparation method of the epoxide modified spray polyurea protective system for steel structure surface according to claim 1, it is characterized in that, the preparation method of described component A: by polyether glycol, epoxy resin and thinner add to be had in the reactor of nitrogen protection, under agitation be heated to 100 ~ 120 DEG C, constant temperature is evacuated to still more than internal pressure-0.095MPa and dewaters 3 hours, close the polyisocyanates that vacuum cool-down to 50 ~ 60 DEG C add respective amount, be heated to 70 ~ 90 DEG C of reactions 3 hours, when free isocyanate group content is between 10% ~ 20%, be cooled to 40 ~ 60 DEG C, discharging and obtaining, the preparation method of described B component: first ending amino polyether is joined in reactor, then to add under dispersing auxiliary low rate mixing under stirring after auxiliary agent is uniformly dispersed, add amine chainextender, after anticorrosive packing, high-speed stirring is after 0.5 ~ 1 hour, add other auxiliary agents to mix, discharging after filtering with 200 eye mesh screens.
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CN102079940A (en) * 2010-12-08 2011-06-01 上海瑞鹏化工材料科技有限公司 Preparation method and application technique of hard pure-polyurea coating material sprayed in pipelines
CN102181221A (en) * 2011-01-31 2011-09-14 北京东方雨虹防水技术股份有限公司 Flame-retardant spraying polyurea elastic coating

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