CN101280153A - High temperature-resistant acid-resistant polyurea anti-corrosive paint for spraying desulfuration flue lining - Google Patents
High temperature-resistant acid-resistant polyurea anti-corrosive paint for spraying desulfuration flue lining Download PDFInfo
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Abstract
The invention discloses polyurea anti-corrosive coating which is high-temperature resistant, acid resistant and is used for spraying on the inner lining of a desulfurization flue. The anti-corrosive coating is mixed by component A and component B according to the volume ratio of 1: 0.5-2.0; component A is the mixture of quasi-prepolymer synthesized by 100 portions of polyisocyanate with the functionality of 2.0-2.9 and 35-50 portions of polyester polyol and 2-10 portions of reactive diluent, part by weight; component B is obtained through the mixing and dehydration of 150-250 portions of polyether multi-amine, 1000-1200 portions of polyester multi-amine, 500-620 portions of chain extender, 80-90 portions of cross linking agent, 130-160 portions of diluent, 3-15 portions of catalyst, 500-600 portions of fillers and 50-60 portions of color paste. The polyurea anti-corrosive coating improves the glass temperature of the polyurea coating effectively, reinforces the anticorrosion performance under high-temperature and acid environment; thereby, the service life of the chimney in the thermal power plant is prolonged greatly.
Description
Technical field
The present invention relates to a kind of polyurea anti-corrosion coating.Be particularly useful for fuel-burning power plant desulfurization duct (chimney) liner high temperature-resistant acid-resistant polyurea anti-corrosive paint for spraying.
Background technology
Weigh protective system anticorrosion the belonging to of the desulfurization duct of existing domestic each large and medium-sized thermal power plant.Existing desulfurization duct, chimney anticorrosion technology mainly contain three types: Ni-Ti alloy is anticorrosion, the clay glass flake is anticorrosion, it is anticorrosion to paste the acid-resistant glass brick.Three kinds of aseptic technics respectively have its shortcoming: alloy aseptic technic antiseptic property, high temperature resistant excellent, but involve great expense, need 6000 yuan/square metre, and the alloy weld is difficult to guarantee antiseptic property, the engineering time long (240 meters high chimneys are constructed six months approximately); Clay aseptic technic antiseptic property is good, but resistance to elevated temperatures is poor, and maximum operation (service) temperature can't satisfy power plant's fault temperature 180 ℃ of requirements about 130 ℃, and poor with substrate adhesion, arrive the design coating thickness and need carry out 4～6 times constructions; It is general to paste plate glass technology antiseptic property, and resistance to elevated temperatures is good, but the temp. variation resistant performance is poor, plate glass slit antiseptic property can't guarantee, long construction period.Above-mentioned three kinds of desulfurization ducts are anticorrosion except that alloy is anticorrosion, and clay aseptic technic and subsides acid-resistant glass brick aseptic technic all can't satisfy China's desulfurization duct aseptic technic requirement.And the carbamide paint pyro-oxidation resistance is poor on the existing market, can not be used for the anticorrosion of desulfurization duct.
Summary of the invention
The objective of the invention is to the shortcoming of existing carbamide paint pyro-oxidation resistance difference is improved, a kind of high temperature-resistant acid-resistant polyurea anti-corrosive paint for spraying that fuel-burning power plant desulfurization duct (chimney) liner is used that goes for is provided.The corrosive problem takes place in fuel-burning power plant desulfuration flue lining easily when using other aseptic technics with solving, and prolongs the work-ing life of fuel-burning power plant desulfuration flue lining.
High temperature-resistant acid-resistant polyurea anti-corrosive paint of the present invention is to be 1: 0.5～2.0 to mix by A component and B component according to volume ratio; Described A component is to be 2.0～2.9 the polyisocyanates and the mixture of weight part 35～50 parts of polyester polyol synthetic semi prepolymer and 2～10 portions of reactive thinners of weight part by 100 parts of functionality of weight part; Described B component is the product of making behind the mill base mixed dehydration by the filler of the catalyzer of the thinner of the chainextender of the polyester polyols amine of the polyethers polyamine of 150～250 weight parts, 1000～1200 weight parts, 500～620 weight parts, 80～90 parts by weight of cross-linking agent, 130～160 weight parts, 3～15 weight parts, 500～600 weight parts and 50～60 weight parts.
The polyisocyanates of described A component is selected from following one or several: 4 of carbodiimide-uretonimine-modified, 4 '-diphenylmethanediisocyanate, 2,4 '-diphenylmethanediisocyanate, polymethine polyphenyl polyisocyanate, polymethine phenyl polymethylene polyisocyanates.
The thinner of described A component is carbonic acid alkene ester, DBE or DBGA.
The polyvalent alcohol of described A component is polyether glycol, polyester polyol or Viscotrol C;
The polyether glycol of described A component be selected from following one or several: polyglycol ether, polypropylene glycol ether, polyglycerol ether, polypentaerythritol ether, PTMG, trihydroxy-polyethers EP330N, low-unsaturation-degree polyether GE220A;
The polyester polyol of described A component is the condenses dibasic alcohol of poly terephthalic acid and polyvalent alcohol.
The reactive thinner of described A component is carbonic acid alkene ester, DBE or DBGA.
The polyethers polyamine of described B component is polyoxy propyl diamines, polyoxy propyl triamine, Amino Terminated polyether(ATPE) T-403.
The polyester polyols amine of described B component is by the product of polyester polyol through esterification and ammonification.
The chainextender of described B component is that to be selected from following functionality be 2～3 a kind of or more than one amine chain extender: diformazan sulfenyl tolylene diamine, N, N '-two sec-butyl methylene dianiline (MDA), diamino diformazan sulfenyl chlorobenzene, 3,3 '-two chloro-4,4 '-diaminodiphenyl-methane, N, N '-diaminodiphenyl-methane, 3, the 5-diethyl toluene diamine;
The linking agent of described B component is one or more in the following material: glycerol, glycol ether, 1,4-butyleneglycol, diethanolamine, trolamine;
The catalyzer of described B component is tertiary amine compounds or organotin; Described tertiary amine compound is triethyl diamines or dimethylethanolamine; Described organotin is dibutyl tin laurate or stannous octoate.
The filler of described B component is light calcium carbonate, talcum powder or sericite.
The film formation reaction of A component and B component is:
Its preparation method may further comprise the steps:
(4) preparation of A component: reacted 1～4 hour at 50～90 ℃ by the polyisocyanates of 100 parts by weight functionality 2.0～2.9 and the polyether glycol or the polyester polyol of 35～50 weight parts, the acquisition nco value is 12～22 semi prepolymer, semi prepolymer mixes with the reactive thinner of 2～10 weight parts, and the back discharging stirs;
(5) preparation of B component: after mixing by the mill base of the filler of the catalyzer of the thinner of the chainextender of the polyester polyols amine of the polyethers polyamine of 150～250 weight parts, 1000～1200 weight parts, 500～620 weight parts, 80～90 parts by weight of cross-linking agent, 130～160 weight parts, 3～15 weight parts, 500～600 weight parts and 50～60 weight parts, 100～120 ℃ of dehydrations 2～4 hours, be lower than 0.08% to moisture content and get final product.
Mix the back spraying by A component and B component according to 0.5～2.0 volume ratio when (6) using.
Beneficial effect: the present invention has adopted multiple fire resistant resin, high temperature resistant auxiliary agent etc. that film performance has been carried out modification, the starting material of different functionality have been adopted, improved the cross-linking density of filming, effectively improve the second-order transition temperature of polyurea coating, thoroughly solved the problem of carbamide paint pyro-oxidation resistance difference on the existing market.Can be painted on the steel surface after the sandblast, the spraying one-pass film-forming can reach several millimeters, polyurea coating and substrate adhesion are strong, can reach more than the 10Mpa, wear resisting property is good, shock-resistant, have excellent water-fast steam transmitance and corrosion resistance nature, can effectively prevent of the corrosion of chemical substances such as various acidity, alkalescence to the iron and steel ground.Can effectively strengthen the Corrosion Protection of filming under the high-temperature acidic environment through experiment, prolong the work-ing life of fuel-burning power plant chimney (flue) greatly.
Embodiment
Embodiment 1:
(1) preparation of A component: with 100 weight part functionality is that the polyester polyol of 2.8 polyisocyanates and 40 weight parts adds reactor, after stirring reaction 4 hours at the uniform velocity under 70 ℃ of conditions, sampling were surveyed nco value and reached 20, the cooling back added 10 parts of thinners, discharging promptly obtains the A component;
(2) preparation of B component: with 100 weight part polyethers polyamines, 550 weight part polyester polyols amine, 89 weight parts 3, the 5-diethyl toluene diamine, 50 weight part diformazan sulfenyl tolylene diamines, 30 weight parts 3,3 '-two chloro-4,4 '-diaminodiphenyl-methane, 45 weight part diamino diformazan sulfenyl chlorobenzenes, 40 weight part N, N '-two sec-butyl methylene dianiline (MDA), 40 parts by weight of cross-linking agent, the thinner DBGA of 70 weight parts, the catalyzer triethyl diamines of 2 weight parts, the light calcium carbonate of 120 weight parts, after the mill base of the sericite of 180 weight parts and 25 weight parts mixes, stir dehydration 2～4 hours at 100～120 ℃, detect moisture content and be lower than 0.08%, promptly get the B component;
Wherein the preparation of polyester polyols amine is carried out according to the method for U.S. Pat 3691112.Concrete synthesis step is as follows: the first step esterification: by 100 weight part polyester polyols, be warmed up to 70 ℃, drip the triethylamine of 0.9 weight part, be warmed up to 50 ℃, drip the ketene dimer of 10 weight parts, keep temperature to be no more than 60 ℃, reaction 4h finishes.Reaction product boils off excessive ketene dimer and triethylamine, and sealing is preserved and obtained esterification products;
The second step aminating reaction: by 100 parts of esterification products, 6 parts quadrol, 110 parts of toluene solvants are at 80 ℃ of reaction 6h.Reaction product boils off excessive quadrol and toluene, and 80 ℃ of vacuum-drying 10h promptly obtain polyester polyols amine.Described polyester polyol is the condenses dibasic alcohol of poly terephthalic acid and polyvalent alcohol;
(3) with after A component and the mixing in 1: 1 by volume of B component, adopt high pressure painting equipment, be sprayed directly on the sandblast steel plate, one-pass film-forming thickness is 2 millimeters, and coating and iron and steel substrate adhesion are strong, wear-resistant, high temperature resistant.
Through experiment, coating does not have any wearing and tearing after the fuel-burning power plant flue used through 1 year, adhesion performance of coating is good.
High temperature-resistant acid-resistant polyurea anti-corrosive paint for spraying desulfuration flue lining is constructed according to following steps:
1.. the pre-treatment of iron and steel ground: adopt blasting craft to handle, reach the Sa2.5 level, promptly near white level, roughness Rz is at 50～70 μ m;
2. cleaning surfaces: adopt clean pressurized air that the substrate surface floating dust is blown clean, need not to spray the position, be strictly on guard against that this position tarnishes with shieldings such as newspaper or plastics films;
3.. check before the spraying: workpiece temperature is higher than 5 ℃ of dew points, in case the workpiece dewfall;
4. polyureas construction: adopt special high-pressure polyureas spraying equipment to spray, spray is apart from control 40～100cm, and back one rifle covers about 60% of last rifle, and gait of march is effectively controlled sagging and is as the criterion.Reach the thickness requirement by vertical spraying and horizontal spraying;
5. check, remove shielding: detect thickness, electrical spark is removed hovel.
The coating performance index sees Table 1.
Table 1 coating performance index
| Project | Index |
| Tensile strength | 18.77MPa |
| Tear strength | 100KN/m |
| Surface hardness (Shao D) | 65 |
| Wear resistance (weightlessness) | 20mg |
| Sticking power (drawing back method) | 19.53MPa |
| Anti-180 ℃ of 48h | Coating does not have cracking, no efflorescence |
Embodiment 2:
(1) preparation of A component: with 100 weight part functionality is that the polyether glycol of 2.6 polyisocyanates and 37 weight parts adds reactor, stirring reaction 3 hours at the uniform velocity under 65 ℃ of conditions, after sampling survey nco value reaches design load 19, the cooling back adds the thinner of 5 weight parts, discharging promptly obtains the A component;
(2) preparation of B component: with the polyethers polyamine of 80 weight parts, the polyester polyols amine of 560 weight parts, 3 of 99 weight parts, the 5-diethyl toluene diamine, the diformazan sulfenyl tolylene diamine of 41 weight parts, 3 of 40 weight parts, 3 '-two chloro-4,4 '-diaminodiphenyl-methane, the N of 80 weight parts, N '-two sec-butyl methylene dianiline (MDA), 25 parts by weight of cross-linking agent, the thinner DBGA of 80 weight parts, the catalyzer triethyl diamines of 2 weight parts, the light calcium carbonate of 100 weight parts, after the mill base of the sericite of 200 weight parts and 25 weight parts mixes, stir dehydration 2～4 hours at 100～120 ℃, detect moisture content and be lower than 0.08%, promptly get the B component;
(3) with after A component, the mixing in 1: 0.9 by volume of B component; Adopt high pressure painting equipment, be sprayed directly on the sandblast steel plate, one-pass film-forming thickness is 2 millimeters, and coating and iron and steel substrate adhesion are strong, wear-resistant, high temperature resistant.The coating performance index sees Table 2.
Table 2 coating performance index
| Project | Index |
| Tensile strength | 19.5MPa |
| Tear strength | 91KN/m |
| Surface hardness (Shao D) | 70 |
| Wear resistance (weightlessness) | 17mg |
| Sticking power (drawing back method) | 23.22MPa |
| Anti-180 ℃ of 48h | Coating does not have cracking, no efflorescence |
Claims (7)
1. a high temperature-resistant acid-resistant polyurea anti-corrosive paint for spraying desulfuration flue lining is characterized in that, is to be 1: 0.5～2.0 to mix by A component and B component according to volume ratio; Described A component is to be 2.0～2.9 the polyisocyanates and the mixture of weight part 35～50 parts of polyester polyol synthetic semi prepolymer and 2～10 portions of reactive thinners of weight part by 100 parts of functionality of weight part; Described B component is the product of making behind the mill base mixed dehydration by the filler of the catalyzer of the thinner of the chainextender of the polyester polyols amine of the polyethers polyamine of 150～250 weight parts, 1000～1200 weight parts, 500～620 weight parts, 80～90 parts by weight of cross-linking agent, 130～160 weight parts, 3～15 weight parts, 500～600 weight parts and 50～60 weight parts.
2. high temperature-resistant acid-resistant polyurea anti-corrosive paint for spraying desulfuration flue lining according to claim 1 is characterized in that, the polyethers polyamine of described B component is polyoxy propyl diamines, polyoxy propyl triamine, Amino Terminated polyether(ATPE) T-403.
3. high temperature-resistant acid-resistant polyurea anti-corrosive paint for spraying desulfuration flue lining according to claim 1 is characterized in that,
The polyester polyols amine of described B component is by the product of polyester polyol through esterification and ammonification.
4. high temperature-resistant acid-resistant polyurea anti-corrosive paint for spraying desulfuration flue lining according to claim 1 is characterized in that,
The chainextender of described B component is that to be selected from following functionality be 2～3 a kind of or more than one amine chain extender: diformazan sulfenyl tolylene diamine, N, N '-two sec-butyl methylene dianiline (MDA), diamino diformazan sulfenyl chlorobenzene, 3,3 '-two chloro-4,4 '-diaminodiphenyl-methane, N, N '-diaminodiphenyl-methane, 3, the 5-diethyl toluene diamine.
5. high temperature-resistant acid-resistant polyurea anti-corrosive paint for spraying desulfuration flue lining according to claim 1 is characterized in that, the catalyzer of described B component is tertiary amine compounds or organotin; Described tertiary amine compound is triethyl diamines or dimethylethanolamine; Described organotin is dibutyl tin laurate or stannous octoate.
6. high temperature-resistant acid-resistant polyurea anti-corrosive paint for spraying desulfuration flue lining according to claim 1 is characterized in that, the filler of described B component is light calcium carbonate, talcum powder or sericite.
7. the preparation method of high temperature-resistant acid-resistant polyurea anti-corrosive paint for spraying desulfuration flue lining according to claim 1 is characterized in that, may further comprise the steps:
(1) preparation of A component: reacted 1～4 hour at 50～90 ℃ by the polyisocyanates of 100 weight part functionality 2.0～2.9 and the polyether glycol or the polyester polyol of 35～50 weight parts, the acquisition nco value is 12～22 semi prepolymer, semi prepolymer mixes with the reactive thinner of 2～10 weight parts, and the back discharging stirs;
(2) preparation of B component: after mixing by the mill base of catalyzer, 500～600 weight part fillers and 50～60 weight parts of the thinner of the chainextender of the polyester polyols amine of the polyethers polyamine of 150～250 weight parts, 1000～1200 weight parts, 500～620 weight parts, 80～90 parts by weight of cross-linking agent, 130～160 weight parts, 3～15 weight parts, 100～120 ℃ of dehydrations 2～4 hours, be lower than 0.08% to moisture content and get final product;
Mix the back spraying by A component and B component according to 0.5～2.0 volume ratio when (3) using.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102079948A (en) * | 2010-12-25 | 2011-06-01 | 厦门双瑞船舶涂料有限公司 | Heat resistant, acid resistant and corrosion resistant paint used for brick desulphurization chimney and preparation method thereof |
| CN102863941A (en) * | 2012-06-04 | 2013-01-09 | 上海灼日精细化工有限公司 | Anti-corrosion acid-resistant glue for wet-process desulfurization chimney and preparation method |
| CN103497660A (en) * | 2013-10-15 | 2014-01-08 | 句容市睿远科技有限公司 | Fireproof material for door of high-speed train |
| CN106189761A (en) * | 2016-07-27 | 2016-12-07 | 苏州明轩地坪涂料有限公司 | A kind of anticorrosive paint |
| CN108587438A (en) * | 2018-05-18 | 2018-09-28 | 北京理工大学 | A kind of antiknock energy-absorbing coating material, preparation method and applications |
| CN109456685A (en) * | 2018-11-22 | 2019-03-12 | 耿佃勇 | Anticorrosion antiwear carbamide paint |
| CN112300677A (en) * | 2020-10-14 | 2021-02-02 | 西南科技大学 | Anti-knock impact-resistant polyurea coating for foamed aluminum and preparation method thereof |
| CN112795222A (en) * | 2020-12-29 | 2021-05-14 | 华能山东泗水新能源有限公司 | Anti-corrosion composite material and preparation method and application thereof |
| CN114835875A (en) * | 2022-06-02 | 2022-08-02 | 青岛沙木新材料有限公司 | High-performance sprayable polyurethane foam material and preparation method thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102079948A (en) * | 2010-12-25 | 2011-06-01 | 厦门双瑞船舶涂料有限公司 | Heat resistant, acid resistant and corrosion resistant paint used for brick desulphurization chimney and preparation method thereof |
| CN102079948B (en) * | 2010-12-25 | 2012-10-17 | 厦门双瑞船舶涂料有限公司 | Heat resistant, acid resistant and corrosion resistant paint used for brick desulphurization chimney and preparation method thereof |
| CN102863941A (en) * | 2012-06-04 | 2013-01-09 | 上海灼日精细化工有限公司 | Anti-corrosion acid-resistant glue for wet-process desulfurization chimney and preparation method |
| CN102863941B (en) * | 2012-06-04 | 2015-11-25 | 上海灼日精细化工有限公司 | For the anticorrosion acidproof glue and preparation method thereof of wet desulphurization chimney |
| CN103497660A (en) * | 2013-10-15 | 2014-01-08 | 句容市睿远科技有限公司 | Fireproof material for door of high-speed train |
| CN103497660B (en) * | 2013-10-15 | 2016-01-27 | 句容市石狮冲压件厂 | A kind of fire-retardant material for High Speed Railway Trains car door |
| CN106189761A (en) * | 2016-07-27 | 2016-12-07 | 苏州明轩地坪涂料有限公司 | A kind of anticorrosive paint |
| CN108587438A (en) * | 2018-05-18 | 2018-09-28 | 北京理工大学 | A kind of antiknock energy-absorbing coating material, preparation method and applications |
| CN109456685A (en) * | 2018-11-22 | 2019-03-12 | 耿佃勇 | Anticorrosion antiwear carbamide paint |
| CN112300677A (en) * | 2020-10-14 | 2021-02-02 | 西南科技大学 | Anti-knock impact-resistant polyurea coating for foamed aluminum and preparation method thereof |
| CN112795222A (en) * | 2020-12-29 | 2021-05-14 | 华能山东泗水新能源有限公司 | Anti-corrosion composite material and preparation method and application thereof |
| CN114835875A (en) * | 2022-06-02 | 2022-08-02 | 青岛沙木新材料有限公司 | High-performance sprayable polyurethane foam material and preparation method thereof |
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Open date: 20081008 |