CN110157269B - Steel structure anticorrosion construction process - Google Patents
Steel structure anticorrosion construction process Download PDFInfo
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- CN110157269B CN110157269B CN201910466391.9A CN201910466391A CN110157269B CN 110157269 B CN110157269 B CN 110157269B CN 201910466391 A CN201910466391 A CN 201910466391A CN 110157269 B CN110157269 B CN 110157269B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D143/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing boron, silicon, phosphorus, selenium, tellurium, or a metal; Coating compositions based on derivatives of such polymers
- C09D143/04—Homopolymers or copolymers of monomers containing silicon
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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Abstract
The invention discloses a steel structure anticorrosion construction process, which comprises the following steps: (1) cleaning the surface of a steel structure; (2) coating the environment-friendly water-based anticorrosive paint. According to the steel structure anticorrosion construction process, the film of the developed environment-friendly water-based anticorrosion paint has good adhesion to metal, small structural pores, compact structure, excellent adhesion, high impact strength, good flexibility and strong corrosion resistance, and can effectively protect the base metal; all the raw materials used in the method are environment-friendly and pollution-free, the treatment cost of waste water and waste materials is reduced, and on the basis of ensuring the corrosion resistance of metal elements, the method is energy-saving and environment-friendly and is a green and environment-friendly metal corrosion and rust removal method.
Description
Technical Field
The invention belongs to the technical field of anticorrosion construction, and particularly relates to an anticorrosion construction process for a steel structure.
Background
The steel is an essential material in modern social and economic lives and has wide application in industrial and agricultural production and people's life. The steel structure is a young and extremely vital steel structure system, and is widely applied to the fields of general industrial and agricultural, commercial and service buildings, such as office buildings, villas, warehouses, stadiums, entertainment, tourist buildings, low-rise and multi-story residential buildings and the like. The steel structure is used as the main form of modern buildings, and is widely applied due to the advantages of light weight, high strength, good earthquake resistance, short construction period, high building industrialization degree, large space utilization rate and investment saving.
But the surfaces of various steel products are susceptible to corrosion and rust formation by atmospheric agents and other factors. In order to protect the steel products and extend their service life, the surfaces must be preserved. Metal corrosion causes huge economic loss, wherein 30% of steel is wasted due to corrosion, iron corrosion loss per year is as high as billions, and in some fields, the corrosion condition is more serious, so that the rust removal and corrosion prevention treatment technology of iron and iron alloy is one of the most important subjects at present.
Aiming at the corrosion problem of a steel structure, at present, three solutions are mainly provided, the first is to coat an anticorrosive coating, the second is to electroplate corrosion-resistant metal, and the third is to solve the problem by adopting an alloy method, but most ferroalloys also need to be subjected to anticorrosive treatment. For the first and second treatment modes, rust removal treatment is performed before corrosion prevention treatment, i.e., rust or an oxide layer on the surface of the metal is removed by using a rust remover, and then an anticorrosive material is coated or electroplating is performed.
The most common, economical and practical protection measure to date is paint protection, and among the various anticorrosion technologies, the anticorrosion technology of paint is most widely used. The coating is widely applied due to the characteristics of simple and convenient construction, economy, applicability, no restriction of equipment area and shape and the like. However, the problems of short anticorrosion period, poor flushing resistance, unstable paint film, environmental pollution and the like in the prior art of the metal anticorrosion paint limit the rapid development of the metal anticorrosion paint, and the research on the metal anticorrosion paint has important scientific significance and commercial value for improving the performance of the paint.
Disclosure of Invention
The invention aims to solve the problems and provides a steel structure anticorrosion construction process with a coating layer with good anticorrosion effect and long service life.
The purpose of the invention is realized by the following technical scheme:
an anticorrosion construction process for a steel structure comprises the following steps:
(1) cleaning the surface of a steel structure;
(2) coating the environment-friendly water-based anticorrosive paint.
An anticorrosion construction process for a steel structure comprises the following steps:
(1) cleaning the surface of a steel structure: carrying out surface rust removal on the steel structure, so that the rust removal grade of the steel surface reaches St2 grade or St3 grade, and the surface roughness Rz is 20-120 mu m;
(2) coating the environment-friendly water-based anticorrosive paint, wherein the coating thickness is 10-1000 mu m.
And in the rust removal, tools such as a scraper, a grinding wheel, abrasive cloth, a steel wire brush and the like are used for cleaning up sundries such as iron rust, an old paint film, oil stain, dust and the like on the surface of the steel structure.
The coating mode of the environment-friendly water-based anticorrosive paint is blade coating, dip coating, spray coating, brush coating or roll coating.
The environment-friendly water-based anticorrosive paint is prepared by the following method: stirring 65-75 parts by weight of silicone-acrylic emulsion, 35-45 parts by weight of aqueous epoxy emulsion, 0.5-2 parts by weight of 3- (2, 3-epoxypropoxy) propyltrimethoxysilane and 0.5-3 parts by weight of hydroxyethylidene diphosphonic acid at the rotating speed of 200-500r/min for 30-60min to obtain a mixture A; uniformly mixing 5-15 parts by weight of zinc aluminum phosphate, 5-15 parts by weight of talcum powder or talcum powder modified substance, 3-7 parts by weight of silicon carbide, 1-5 parts by weight of alumina, 5-15 parts by weight of titanium dioxide and 20-50 parts by weight of water to obtain a mixture B; adding the mixture B into the mixture A, adding 0.5-3 parts by weight of water-based wetting dispersant, 1-5 parts by weight of flame retardant auxiliary agent, 0.3-0.9 part by weight of mildew preventive, 0.5-2 parts by weight of defoaming agent and 1-5 parts by weight of film forming auxiliary agent, and stirring for 30-60min at the temperature of 30-50 ℃ and the rotating speed of 300-900 r/min.
The mildew preventive is isothiazolinone or benzisothiazolinone.
The aqueous wetting dispersant is sodium hexametaphosphate.
The flame retardant auxiliary agent is phosphorus-containing hybrid graphene oxide and/or a carbon nano tube containing DOPO groups. Further, the flame retardant auxiliary agent is phosphorus-containing hybrid graphene oxide and a carbon nano tube containing a DOPO group according to a mass ratio of 1: (0.2-0.3).
The defoaming agent is an aqueous non-silicone fatty acid polymer or dimethyl silicone oil.
The film-forming assistant is propylene glycol butyl ether or dipropylene glycol methyl ether.
The preparation method of the talcum powder modified substance comprises the following steps: adding 90-110g of talcum powder into 1300-1900g of water, heating to 40-60 ℃, adding 70-90g of sodium dihydrogen phosphate, uniformly mixing, then dropwise adding 280-360g of aluminum trichloride aqueous solution with the mass fraction of 10-30% under the stirring condition of the temperature of 40-60 ℃ and the rotating speed of 200-500r/min, continuously stirring for 3-8h at the temperature of 40-60 ℃ and the rotating speed of 200-500r/min after the dropwise adding is finished, carrying out centrifugal separation, and drying the precipitate to obtain the pretreated talcum powder; adding 4-10g of phenoxy phosphorous acid dichloride, 15-25g of diphenyl chlorophosphate and 50-100g of triethylamine into 700g of toluene 300-.
The drying temperature is 80-110 ℃, and the drying time is 30-50 h.
The dropping speed of the aluminum trichloride aqueous solution is 0.5-1.5 g/s.
The dropping speed of the modified liquid is 0.5-1.5 g/s.
The rotation speed of the centrifugal separation is 5000-.
According to the steel structure anticorrosion construction process, the film of the developed environment-friendly water-based anticorrosion paint has good adhesion to metal, small structural pores, compact structure, excellent adhesion, high impact strength, good flexibility and strong corrosion resistance, and can effectively protect the base metal; all the raw materials used in the method are environment-friendly and pollution-free, the treatment cost of waste water and waste materials is reduced, and on the basis of ensuring the corrosion resistance of metal elements, the method is energy-saving and environment-friendly and is a green and environment-friendly metal corrosion and rust removal method.
Detailed Description
The present invention will be described in detail with reference to specific embodiments, which are illustrative of the invention and are not to be construed as limiting the invention.
The raw materials used were as follows: the zinc aluminum phosphate is industrial grade zinc aluminum phosphate ZPA provided by Shanghai Fukang New Material science and technology Limited, and the average grain diameter is 0.3-0.6 μm. Triethylamine, CAS number: 121-44-8. Toluene, CAS No.: 108-88-3. Hydroxyethylidene diphosphonic acid, CAS No.: 2809-21-4. 3- (2, 3-glycidoxy) propyltrimethoxysilane, CAS no: 2530-83-8. Phenoxy phosphoramidite dichloride, CAS No.: 3426-89-9. The talcum powder is Yf-750 type superfine talcum powder provided by Jiangsu Yifeng powder raw material company Limited, and the fineness of the superfine talcum powder is 5000 meshes. Sodium dihydrogen phosphate, CAS No.: 7558-80-7. The steel structure is made of Q235 steel. The silicone-acrylate emulsion was prepared according to the method described in the specific embodiment of chinese patent application No. 200810045627.3. The aqueous epoxy emulsion was prepared according to the method shown in example 1 of chinese patent application No. 201110299123.6. The silicon carbide is provided by Andi metal materials Co., Ltd, Qinghe county, and has a product number of JL-SiC-1, and the average particle size of 50 nm. The alumina is DCA-300N alumina (aluminum oxide) provided by Shandong Jiaying chemical technology Co., Ltd, and D50 is 0.30 + -0.2 μm. The titanium dioxide is rutile titanium dioxide with the model of R818 provided by Jinan Yuxing chemical Limited liability company, and the average particle diameter is 0.2-0.26 mu m. Isothiazolinone, CAS No.: 55965-84-9. The sodium hexametaphosphate is industrial grade sodium hexametaphosphate provided by apricot male metal chemical industry Co., Ltd. The simethicone is 201-500 model simethicone provided by Hongzhen Hongyu silicon chemical Limited company. Dipropylene glycol methyl ether, CAS No.: 34590-94-8. The phosphorus-containing hybrid graphene oxide was prepared according to the method shown in example 9 in chinese patent application No. 201510479484.7. The carbon nanotubes containing DOPO groups were prepared according to the method shown in example 1 of chinese patent application No. 201110070168.6. Aluminum chloride, CAS No.: 7446-70-0. Diphenyl chlorophosphate, CAS No.: 2524-64-3.
Example 1
The steel structure anticorrosion construction process comprises the following steps:
(1) cleaning the surface of a steel structure: rust removal is carried out on the surface of the steel structure by a steel wire brush, impurities such as rust, old paint film, oil stain, dust and the like on the surface of the steel structure are cleaned, the rust removal grade of the surface of the steel product reaches St2 grade, and the surface roughness Rz is 60-80 mu m;
(2) and (2) spraying the environment-friendly water-based anticorrosive paint on the steel structure surface treated in the step (1) according to a conventional process, wherein the spraying thickness is 20 microns.
Example 2
The steel structure anticorrosion construction process comprises the following steps:
(1) cleaning the surface of a steel structure: rust removal is carried out on the surface of the steel structure by a steel wire brush, impurities such as rust, old paint film, oil stain, dust and the like on the surface of the steel structure are cleaned, the rust removal grade of the surface of the steel product reaches St2 grade, and the surface roughness Rz is 60-80 mu m;
(2) and (2) spraying the environment-friendly water-based anticorrosive paint on the steel structure surface treated in the step (1) according to a conventional process, wherein the spraying thickness is 20 microns.
The environment-friendly water-based anticorrosive paint is prepared by the following method: stirring 70 parts by weight of silicone-acrylic emulsion, 40 parts by weight of aqueous epoxy emulsion, 1 part by weight of 3- (2, 3-epoxypropoxy) propyl trimethoxy silane and 1.5 parts by weight of hydroxyethylidene diphosphonic acid for 40min at the rotating speed of 300r/min to obtain a mixture A; uniformly mixing 10 parts by weight of zinc aluminum phosphate, 8 parts by weight of talcum powder modified substance, 5 parts by weight of silicon carbide, 3 parts by weight of alumina, 8 parts by weight of titanium dioxide and 30 parts by weight of deionized water to obtain a mixture B; and adding the mixture B into the mixture A, adding 2 parts by weight of aqueous wetting dispersant, 2.5 parts by weight of flame-retardant auxiliary agent, 0.6 part by weight of mildew preventive, 1 part by weight of defoaming agent and 3 parts by weight of film-forming auxiliary agent, and stirring at the temperature of 40 ℃ and the rotating speed of 600r/min for 40min to obtain the environment-friendly aqueous anticorrosive coating.
The mildew preventive is isothiazolinone.
The aqueous wetting dispersant is sodium hexametaphosphate.
The flame retardant additive is phosphorus-containing hybrid graphene oxide.
The defoaming agent is dimethyl silicone oil.
The film-forming aid is dipropylene glycol methyl ether.
The preparation method of the talcum powder modified substance comprises the following steps: adding 100g of talcum powder into 1500g of deionized water, heating to 50 ℃, adding 84g of sodium dihydrogen phosphate, uniformly mixing, then dropwise adding 320g of 20 mass percent aluminum trichloride aqueous solution under stirring at the temperature of 50 ℃ and the rotating speed of 300r/min, continuously stirring for 6.5 hours at the temperature of 50 ℃ and the rotating speed of 300r/min after dropwise adding, then centrifugally separating for 30 minutes at the rotating speed of 6000r/min, and drying the precipitate for 40 hours at the temperature of 90 ℃ to obtain pretreated talcum powder; adding 5.5g of phenoxy phosphorous acid dichloride, 16g of diphenyl chlorophosphate and 80g of triethylamine into 500g of toluene, uniformly mixing to obtain a modified solution, adding 100g of pretreated talcum powder into 2000g of toluene, dropwise adding 500g of the modified solution under the conditions of 80 ℃ and 300r/min of rotation speed, stirring for 4 hours at 80 ℃ and 300r/min of rotation speed after dropwise adding is finished, then centrifugally separating for 30 minutes at 6000r/min of rotation speed, washing precipitates with ethanol for 3 times, drying for 40 hours at 90 ℃, and washing the ethanol for 3 times to obtain the talcum powder modified substance, wherein the amount of the ethanol for each time is 3 times of the weight of the precipitates.
Example 3
The steel structure anticorrosion construction process comprises the following steps:
(1) cleaning the surface of a steel structure: rust removal is carried out on the surface of the steel structure by a steel wire brush, impurities such as rust, old paint film, oil stain, dust and the like on the surface of the steel structure are cleaned, the rust removal grade of the surface of the steel product reaches St2 grade, and the surface roughness Rz is 60-80 mu m;
(2) and (2) spraying the environment-friendly water-based anticorrosive paint on the steel structure surface treated in the step (1) according to a conventional process, wherein the spraying thickness is 20 microns.
The environment-friendly water-based anticorrosive paint is prepared by the following method: stirring 70 parts by weight of silicone-acrylic emulsion, 40 parts by weight of aqueous epoxy emulsion, 1 part by weight of 3- (2, 3-epoxypropoxy) propyl trimethoxy silane and 1.5 parts by weight of hydroxyethylidene diphosphonic acid for 40min at the rotating speed of 300r/min to obtain a mixture A; uniformly mixing 10 parts by weight of zinc aluminum phosphate, 8 parts by weight of talcum powder, 5 parts by weight of silicon carbide, 3 parts by weight of alumina, 8 parts by weight of titanium dioxide and 30 parts by weight of deionized water to obtain a mixture B; and adding the mixture B into the mixture A, adding 2 parts by weight of aqueous wetting dispersant, 2.5 parts by weight of flame-retardant auxiliary agent, 0.6 part by weight of mildew preventive, 1 part by weight of defoaming agent and 3 parts by weight of film-forming auxiliary agent, and stirring at the temperature of 40 ℃ and the rotating speed of 600r/min for 40min to obtain the environment-friendly aqueous anticorrosive coating.
The mildew preventive is isothiazolinone.
The aqueous wetting dispersant is sodium hexametaphosphate.
The flame retardant additive is phosphorus-containing hybrid graphene oxide.
The defoaming agent is dimethyl silicone oil.
The film-forming aid is dipropylene glycol methyl ether.
Example 4
The steel structure anticorrosion construction process comprises the following steps:
(1) cleaning the surface of a steel structure: rust removal is carried out on the surface of the steel structure by a steel wire brush, impurities such as rust, old paint film, oil stain, dust and the like on the surface of the steel structure are cleaned, the rust removal grade of the surface of the steel product reaches St2 grade, and the surface roughness Rz is 60-80 mu m;
(2) and (2) spraying the environment-friendly water-based anticorrosive paint on the steel structure surface treated in the step (1) according to a conventional process, wherein the spraying thickness is 20 microns.
The environment-friendly water-based anticorrosive paint is prepared by the following method: stirring 70 parts by weight of silicone-acrylic emulsion, 40 parts by weight of aqueous epoxy emulsion, 1 part by weight of 3- (2, 3-epoxypropoxy) propyl trimethoxy silane and 1.5 parts by weight of hydroxyethylidene diphosphonic acid for 40min at the rotating speed of 300r/min to obtain a mixture A; uniformly mixing 10 parts by weight of zinc aluminum phosphate, 8 parts by weight of talcum powder modified substance, 5 parts by weight of silicon carbide, 3 parts by weight of alumina, 8 parts by weight of titanium dioxide and 30 parts by weight of deionized water to obtain a mixture B; and adding the mixture B into the mixture A, adding 2 parts by weight of aqueous wetting dispersant, 2.5 parts by weight of flame-retardant auxiliary agent, 0.6 part by weight of mildew preventive, 1 part by weight of defoaming agent and 3 parts by weight of film-forming auxiliary agent, and stirring at the temperature of 40 ℃ and the rotating speed of 600r/min for 40min to obtain the environment-friendly aqueous anticorrosive coating.
The mildew preventive is isothiazolinone.
The aqueous wetting dispersant is sodium hexametaphosphate.
The flame retardant additive is phosphorus-containing hybrid graphene oxide.
The defoaming agent is dimethyl silicone oil.
The film-forming aid is dipropylene glycol methyl ether.
The preparation method of the talcum powder modified substance comprises the following steps: adding 100g of talcum powder into 1500g of deionized water, heating to 50 ℃, adding 84g of sodium dihydrogen phosphate, uniformly mixing, then dropwise adding 320g of 20 mass percent aluminum trichloride aqueous solution under stirring at the temperature of 50 ℃ and the rotating speed of 300r/min, continuously stirring for 6.5 hours at the temperature of 50 ℃ and the rotating speed of 300r/min after dropwise adding, then centrifugally separating for 30 minutes at the rotating speed of 6000r/min, and drying the precipitate for 40 hours at the temperature of 90 ℃ to obtain pretreated talcum powder; adding 16g of diphenyl chlorophosphate and 80g of triethylamine into 500g of toluene, uniformly mixing to obtain a modified solution, adding 100g of pretreated talcum powder into 2000g of toluene, dropwise adding 500g of the modified solution under stirring at 80 ℃ and 300r/min, continuously stirring for 4h at 80 ℃ and 300r/min after dropwise adding, centrifugally separating for 30min at 6000r/min, washing the precipitate for 3 times with ethanol, drying for 40h at 90 ℃, wherein the amount of the ethanol used for washing each time is 3 times of the weight of the precipitate, and thus obtaining the talcum powder modified substance.
Example 5
The steel structure anticorrosion construction process comprises the following steps:
(1) cleaning the surface of a steel structure: rust removal is carried out on the surface of the steel structure by a steel wire brush, impurities such as rust, old paint film, oil stain, dust and the like on the surface of the steel structure are cleaned, the rust removal grade of the surface of the steel product reaches St2 grade, and the surface roughness Rz is 60-80 mu m;
(2) and (2) spraying the environment-friendly water-based anticorrosive paint on the steel structure surface treated in the step (1) according to a conventional process, wherein the spraying thickness is 20 microns.
The environment-friendly water-based anticorrosive paint is prepared by the following method: stirring 70 parts by weight of silicone-acrylic emulsion, 40 parts by weight of aqueous epoxy emulsion, 1 part by weight of 3- (2, 3-epoxypropoxy) propyl trimethoxy silane and 1.5 parts by weight of hydroxyethylidene diphosphonic acid for 40min at the rotating speed of 300r/min to obtain a mixture A; uniformly mixing 10 parts by weight of zinc aluminum phosphate, 8 parts by weight of talcum powder modified substance, 5 parts by weight of silicon carbide, 3 parts by weight of alumina, 8 parts by weight of titanium dioxide and 30 parts by weight of deionized water to obtain a mixture B; and adding the mixture B into the mixture A, adding 2 parts by weight of aqueous wetting dispersant, 2.5 parts by weight of flame-retardant auxiliary agent, 0.6 part by weight of mildew preventive, 1 part by weight of defoaming agent and 3 parts by weight of film-forming auxiliary agent, and stirring at the temperature of 40 ℃ and the rotating speed of 600r/min for 40min to obtain the environment-friendly aqueous anticorrosive coating.
The mildew preventive is isothiazolinone.
The aqueous wetting dispersant is sodium hexametaphosphate.
The flame-retardant auxiliary agent is a carbon nano tube containing DOPO groups.
The defoaming agent is dimethyl silicone oil.
The film-forming aid is dipropylene glycol methyl ether.
The preparation method of the talcum powder modified substance comprises the following steps: adding 100g of talcum powder into 1500g of deionized water, heating to 50 ℃, adding 84g of sodium dihydrogen phosphate, uniformly mixing, then dropwise adding 320g of 20 mass percent aluminum trichloride aqueous solution under stirring at the temperature of 50 ℃ and the rotating speed of 300r/min, continuously stirring for 6.5 hours at the temperature of 50 ℃ and the rotating speed of 300r/min after dropwise adding, then centrifugally separating for 30 minutes at the rotating speed of 6000r/min, and drying the precipitate for 40 hours at the temperature of 90 ℃ to obtain pretreated talcum powder; adding 5.5g of phenoxy phosphorous acid dichloride, 16g of diphenyl chlorophosphate and 80g of triethylamine into 500g of toluene, uniformly mixing to obtain a modified solution, adding 100g of pretreated talcum powder into 2000g of toluene, dropwise adding 500g of the modified solution under the conditions of 80 ℃ and 300r/min of rotation speed, stirring for 4 hours at 80 ℃ and 300r/min of rotation speed after dropwise adding is finished, then centrifugally separating for 30 minutes at 6000r/min of rotation speed, washing precipitates with ethanol for 3 times, drying for 40 hours at 90 ℃, and washing the ethanol for 3 times to obtain the talcum powder modified substance, wherein the amount of the ethanol for each time is 3 times of the weight of the precipitates.
Example 6
The steel structure anticorrosion construction process comprises the following steps:
(1) cleaning the surface of a steel structure: rust removal is carried out on the surface of the steel structure by a steel wire brush, impurities such as rust, old paint film, oil stain, dust and the like on the surface of the steel structure are cleaned, the rust removal grade of the surface of the steel product reaches St2 grade, and the surface roughness Rz is 60-80 mu m;
(2) and (2) spraying the environment-friendly water-based anticorrosive paint on the steel structure surface treated in the step (1) according to a conventional process, wherein the spraying thickness is 20 microns.
The environment-friendly water-based anticorrosive paint is prepared by the following method: stirring 70 parts by weight of silicone-acrylic emulsion, 40 parts by weight of aqueous epoxy emulsion, 1 part by weight of 3- (2, 3-epoxypropoxy) propyl trimethoxy silane and 1.5 parts by weight of hydroxyethylidene diphosphonic acid for 40min at the rotating speed of 300r/min to obtain a mixture A; uniformly mixing 10 parts by weight of zinc aluminum phosphate, 8 parts by weight of talcum powder modified substance, 5 parts by weight of silicon carbide, 3 parts by weight of alumina, 8 parts by weight of titanium dioxide and 30 parts by weight of deionized water to obtain a mixture B; and adding the mixture B into the mixture A, adding 2 parts by weight of aqueous wetting dispersant, 2.5 parts by weight of flame-retardant auxiliary agent, 0.6 part by weight of mildew preventive, 1 part by weight of defoaming agent and 3 parts by weight of film-forming auxiliary agent, and stirring at the temperature of 40 ℃ and the rotating speed of 600r/min for 40min to obtain the environment-friendly aqueous anticorrosive coating.
The mildew preventive is isothiazolinone.
The aqueous wetting dispersant is sodium hexametaphosphate.
The flame retardant additive is phosphorus-containing hybrid graphene oxide and a carbon nano tube containing a DOPO group according to a mass ratio of 1: 0.25 of the mixture.
The defoaming agent is dimethyl silicone oil.
The film-forming aid is dipropylene glycol methyl ether.
The preparation method of the talcum powder modified substance comprises the following steps: adding 100g of talcum powder into 1500g of deionized water, heating to 50 ℃, adding 84g of sodium dihydrogen phosphate, uniformly mixing, then dropwise adding 320g of 20 mass percent aluminum trichloride aqueous solution under stirring at the temperature of 50 ℃ and the rotating speed of 300r/min, continuously stirring for 6.5 hours at the temperature of 50 ℃ and the rotating speed of 300r/min after dropwise adding, then centrifugally separating for 30 minutes at the rotating speed of 6000r/min, and drying the precipitate for 40 hours at the temperature of 90 ℃ to obtain pretreated talcum powder; adding 5.5g of phenoxy phosphorous acid dichloride, 16g of diphenyl chlorophosphate and 80g of triethylamine into 500g of toluene, uniformly mixing to obtain a modified solution, adding 100g of pretreated talcum powder into 2000g of toluene, dropwise adding 500g of the modified solution under the conditions of 80 ℃ and 300r/min of rotation speed, stirring for 4 hours at 80 ℃ and 300r/min of rotation speed after dropwise adding is finished, then centrifugally separating for 30 minutes at 6000r/min of rotation speed, washing precipitates with ethanol for 3 times, drying for 40 hours at 90 ℃, and washing the ethanol for 3 times to obtain the talcum powder modified substance, wherein the amount of the ethanol for each time is 3 times of the weight of the precipitates.
Test example 1
The performance of the environment-friendly water-based anticorrosive paint of the embodiment is tested, and the specific results are shown in table 1.
The preparation process of the coating comprises the following steps: the base material is a tin plate, the material of the tin plate conforms to the GB/T2520-88 specification, the surface treatment conforms to the GB/T9271-88, and a paint film is prepared according to GB/T1727-92 general paint film preparation method. The environment-friendly water-based anticorrosive paint is sprayed on the surface of the tin plate, the spraying thickness is 2mm, and then the tin plate is dried in a blast oven with constant temperature and humidity for 0.5h at 30 ℃ to form a coating.
Fire retardance: the test was carried out as specified in GB/T15442.4-1995.
The flexibility of the environment-friendly water-based anticorrosive paint is detected according to the method of GB/T1731-93.
And detecting the drying time of the environment-friendly water-based anticorrosive paint according to the GB/T1728-89 method.
Table 1: test data sheet
According to the steel structure anticorrosion construction process, the talcum powder is modified, the flame retardance and the dispersity of the talcum powder are improved, the phosphorus-containing hybrid graphene oxide as the flame retardant auxiliary agent has certain air barrier property and flame retardance, and the developed environment-friendly water-based anticorrosion paint is good in metal adhesion, small in structural air hole, compact in structure, high in impact strength, good in flexibility and strong in corrosion resistance, has excellent adhesion, and has an efficient protection effect on base metal; all the raw materials used in the method are environment-friendly and pollution-free, the treatment cost of waste water and waste materials is reduced, and on the basis of ensuring the corrosion resistance of metal elements, the method is energy-saving and environment-friendly and is a green and environment-friendly metal corrosion and rust removal method.
Claims (7)
1. The steel structure anticorrosion construction process is characterized by comprising the following steps:
(1) cleaning the surface of a steel structure: carrying out surface rust removal on the steel structure, so that the rust removal grade of the steel surface reaches St2 grade or St3 grade, and the surface roughness Rz is 20-120 mu m;
(2) coating an environment-friendly water-based anticorrosive paint with the coating thickness of 10-1000 mu m;
the environment-friendly water-based anticorrosive paint is prepared by the following method: stirring 65-75 parts by weight of silicone-acrylic emulsion, 35-45 parts by weight of aqueous epoxy emulsion, 0.5-2 parts by weight of 3- (2, 3-epoxypropoxy) propyltrimethoxysilane and 0.5-3 parts by weight of hydroxyethylidene diphosphonic acid at the rotating speed of 200-500r/min for 30-60min to obtain a mixture A; uniformly mixing 5-15 parts by weight of zinc aluminum phosphate, 5-15 parts by weight of talcum powder modified substance, 3-7 parts by weight of silicon carbide, 1-5 parts by weight of alumina, 5-15 parts by weight of titanium dioxide and 20-50 parts by weight of water to obtain a mixture B; adding the mixture B into the mixture A, adding 0.5-3 parts by weight of water-based wetting dispersant, 1-5 parts by weight of flame retardant auxiliary agent, 0.3-0.9 part by weight of mildew preventive, 0.5-2 parts by weight of defoaming agent and 1-5 parts by weight of film forming auxiliary agent, and stirring for 30-60min at the temperature of 30-50 ℃ and the rotating speed of 300-900r/min to obtain the flame retardant coating;
the preparation method of the talcum powder modified substance comprises the following steps: adding 90-110g of talcum powder into 1300-1900g of water, heating to 40-60 ℃, adding 70-90g of sodium dihydrogen phosphate, uniformly mixing, then dropwise adding 280-360g of aluminum trichloride aqueous solution with the mass fraction of 10-30% under the stirring condition of the temperature of 40-60 ℃ and the rotating speed of 200-500r/min, continuously stirring for 3-8h at the temperature of 40-60 ℃ and the rotating speed of 200-500r/min after the dropwise adding is finished, carrying out centrifugal separation, and drying the precipitate to obtain the pretreated talcum powder; adding 4-10g of phenoxy phosphorous acid dichloride, 15-25g of diphenyl chlorophosphate and 50-100g of triethylamine into 700g of 300-one toluene, uniformly mixing to obtain a modified solution, adding 90-110g of pretreated talcum powder into 2500g of 1500-one toluene, dropwise adding 700g of 300-one modified solution under the conditions that the temperature is 70-90 ℃ and the rotating speed is 200-one 500r/min, stirring for 2-6h under the conditions that the temperature is 70-90 ℃ and the rotating speed is 200-one 500r/min after dropwise adding is finished, carrying out centrifugal separation, washing the precipitate for 2-5 times by using ethanol, and drying to obtain a talcum powder modified substance;
the flame retardant additive is phosphorus-containing hybrid graphene oxide and a carbon nano tube containing a DOPO group according to a mass ratio of 1: (0.2-0.3);
the preparation method of the phosphorus-containing hybrid graphene oxide comprises the following steps:
adding 0.1 g of graphene oxide into 100g of tetrahydrofuran, and mechanically stirring for 1h to obtain a fully mixed system A; under the conditions of nitrogen protection and stirring, 5g of triethylamine is added into the system A, and the mixture reacts for 2 hours at 4 ℃ to obtain a system B; dissolving 0.9 g of phosphazene in 20g of tetrahydrofuran to obtain a system C; dropwise adding the system C into the system B, and reacting for 3h at 0 ℃; heating to 46 ℃ and reacting for 5h to obtain a system D; dissolving 1g of 3-aminopropyltriethoxysilane and 3g of gamma-aminopropyltrimethoxysilane in 20g of tetrahydrofuran to obtain a system E; dropwise adding the system E into the system D, and reacting at 50 ℃ for 3h to obtain a system F; 0.8 g of water is added into the system F drop by drop and reacted for 5h at 55 ℃; then reacting for 18h at 15 ℃, after the reaction is finished, filtering, washing for 3 times by using tetrahydrofuran and ethanol respectively, and drying for 10h in a vacuum oven at 60 ℃ to obtain phosphorus-containing hybrid graphene oxide;
the preparation method of the carbon nano tube containing the DOPO group comprises the following specific steps:
1. mixing 100g of H2SO4With HNO3Mixed solution of (2) (98% H)2SO4∶68% HNO3= 3: 1) and 5g of carbon nanotubes, reflux-reacting for 4 hours at 100 ℃ under the ultrasonic oscillation condition, and then repeatedly washing with water until the pH value is neutral; vacuum drying to obtain a product; using 150 g of H2SO4And H2O2Mixed solution of (2) (98% H)2SO4∶30% H2O2= 4: 1) and 5g of the above one-step acidification product, refluxing at 70 ℃ for 2.5 hours, then washing with water repeatedly until the pH is neutral;
2. stirring and refluxing 5g of the acidified carbon nano tube and 250 g of thionyl chloride at 70 ℃ for 24 hours, filtering, and washing with Tetrahydrofuran (THF) until the mixture is neutral;
3. adding 100g of DOPO into 500g of ethanol, heating to 80 ℃, slowly dripping 200 g of formaldehyde aqueous solution under stirring, heating to reflux for 12 hours, standing and cooling after the reaction is finished, filtering after solid is completely separated out, and drying in a vacuum oven at 50 ℃;
4. mixing 5g of the carbon nanotube with acyl chloride obtained in the step 2 and 100g of the DOPO with hydroxyl obtained in the step 3 with 200 g of toluene, heating to 90 ℃, stirring, refluxing, reacting for 12 hours, standing, cooling after the reaction is finished, filtering after the solid is completely separated out, and drying in a vacuum oven at 50 ℃ to obtain the carbon nanotube containing the DOPO group.
2. The steel structure anticorrosion construction process of claim 1, wherein the environment-friendly water-based anticorrosion paint is applied in a blade coating mode, a dip coating mode, a spray coating mode, a brush coating mode or a roll coating mode.
3. The steel structure anticorrosion construction process of claim 1, wherein the mildew preventive is isothiazolinone or benzisothiazolinone; the aqueous wetting dispersant is sodium hexametaphosphate; the defoaming agent is an aqueous non-silicone fatty acid polymer or dimethyl silicone oil; the film-forming assistant is propylene glycol butyl ether or dipropylene glycol methyl ether.
4. An anticorrosion construction process for a steel structure as claimed in claim 1, wherein the drying temperature is 80-110 ℃ and the drying time is 30-50 h.
5. The steel structure anticorrosion construction process of claim 1, wherein the dropping speed of the aluminum trichloride aqueous solution is 0.5-1.5 g/s; the dropping speed of the modified liquid is 0.5-1.5 g/s.
6. The steel structure anticorrosion construction process as claimed in claim 1, wherein the rotation speed of the centrifugal separation is 5000-.
7. The steel structure anticorrosion construction process of claim 1, wherein the steel structure anticorrosion construction process comprises the following steps:
(1) cleaning the surface of a steel structure: rust removal is carried out on the surface of the steel structure by a steel wire brush, impurities such as rust, old paint film, oil stain, dust and the like on the surface of the steel structure are cleaned, the rust removal grade of the surface of the steel product reaches St2 grade, and the surface roughness Rz is 60-80 mu m;
(2) spraying environment-friendly water-based anticorrosive paint on the surface of the steel structure treated in the step (1) according to a conventional process, wherein the spraying thickness is 20 microns;
the environment-friendly water-based anticorrosive paint is prepared by the following method: stirring 70 parts by weight of silicone-acrylic emulsion, 40 parts by weight of aqueous epoxy emulsion, 1 part by weight of 3- (2, 3-epoxypropoxy) propyl trimethoxy silane and 1.5 parts by weight of hydroxyethylidene diphosphonic acid for 40min at the rotating speed of 300r/min to obtain a mixture A; uniformly mixing 10 parts by weight of zinc aluminum phosphate, 8 parts by weight of talcum powder modified substance, 5 parts by weight of silicon carbide, 3 parts by weight of alumina, 8 parts by weight of titanium dioxide and 30 parts by weight of deionized water to obtain a mixture B; adding the mixture B into the mixture A, adding 2 parts by weight of aqueous wetting dispersant, 2.5 parts by weight of flame-retardant auxiliary agent, 0.6 part by weight of mildew preventive, 1 part by weight of defoaming agent and 3 parts by weight of film-forming auxiliary agent, and stirring at the temperature of 40 ℃ and the rotating speed of 600r/min for 40min to obtain the environment-friendly aqueous anticorrosive coating;
the mildew preventive is isothiazolinone;
the aqueous wetting dispersant is sodium hexametaphosphate;
the flame retardant additive is phosphorus-containing hybrid graphene oxide and a carbon nano tube containing a DOPO group according to a mass ratio of 1: 0.25 of a mixture;
the defoaming agent is dimethyl silicone oil;
the film-forming aid is dipropylene glycol methyl ether;
the preparation method of the talcum powder modified substance comprises the following steps: adding 100g of talcum powder into 1500g of deionized water, heating to 50 ℃, adding 84g of sodium dihydrogen phosphate, uniformly mixing, then dropwise adding 320g of 20 mass percent aluminum trichloride aqueous solution under stirring at the temperature of 50 ℃ and the rotating speed of 300r/min, continuously stirring for 6.5 hours at the temperature of 50 ℃ and the rotating speed of 300r/min after dropwise adding, then centrifugally separating for 30 minutes at the rotating speed of 6000r/min, and drying the precipitate for 40 hours at the temperature of 90 ℃ to obtain pretreated talcum powder; adding 5.5g of phenoxy phosphorous acid dichloride, 16g of diphenyl chlorophosphate and 80g of triethylamine into 500g of toluene, uniformly mixing to obtain a modified solution, adding 100g of pretreated talcum powder into 2000g of toluene, dropwise adding 500g of the modified solution under the conditions of 80 ℃ and 300r/min of rotation speed, stirring for 4 hours at 80 ℃ and 300r/min of rotation speed after dropwise adding is finished, then centrifugally separating for 30 minutes at 6000r/min of rotation speed, washing precipitates with ethanol for 3 times, drying for 40 hours at 90 ℃, and washing the ethanol for 3 times to obtain the talcum powder modified substance, wherein the amount of the ethanol for each time is 3 times of the weight of the precipitates.
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