CN110643259A - Special anticorrosive paint for transmission tower and preparation method thereof - Google Patents
Special anticorrosive paint for transmission tower and preparation method thereof Download PDFInfo
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F214/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
- C08F214/18—Monomers containing fluorine
- C08F214/26—Tetrafluoroethene
- C08F214/265—Tetrafluoroethene with non-fluorinated comonomers
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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
- C09D127/00—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 at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—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 at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—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 at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C09D127/18—Homopolymers or copolymers of tetrafluoroethene
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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
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/106—Anti-corrosive paints containing metal dust containing Zn
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0893—Zinc
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
Abstract
The invention belongs to the technical field of corrosion prevention, and particularly relates to a special anticorrosive coating for a power transmission tower and a preparation method thereof. The primer of the anticorrosive paint is as follows: epoxy resin, n-butyl titanate, chromium acetylacetonate, polyvinyl formal and zinc powder; the finish paint is as follows: tetrafluoroethylene, dicyclohexylmethane diisocyanate, acrylate, acrylic acid, methyl isobutyl ketone, azodiisobutyronitrile and dibutyltin dilaurate. According to the invention, through the modified epoxy resin, the prepared primer has good adhesion with steel components of a power transmission tower, good adhesion, excellent electrochemical or chemical anticorrosion function, short curing time and good durability, and the weather resistance and the corrosion resistance of the coating are improved; the finish paint provided by the invention is simple to spray, good in thickness controllability, resistant to ultraviolet damage and wide in application range.
Description
Technical Field
The invention belongs to the technical field of corrosion prevention, and particularly relates to a special anticorrosive coating for a power transmission tower and a preparation method thereof.
Background
Power transmission towers are supporting points for overhead lines, and due to rapid economic development, the demand for electric power is increasing day by day, and safe and reliable power supply is very important. The power transmission network assumes the role of national power transmission, wherein the safe and reliable operation of the transmission towers is crucial to ensure reliable power transmission. When the transmission tower runs, the transmission tower encounters various corrosion damages in various natural environments, the corrosion of the transmission tower during construction is a problem frequently occurring in engineering, and the mechanical property of the corroded transmission tower is greatly reduced.
At present, about 80% of metal parts are used in atmospheric environments, and the metal lost due to environmental corrosion accounts for more than half of the total corrosion of the metal. Worldwide steel structures and equipment that are scrapped for corrosion represent about 20-30% of the annual production of steel, and worldwide annual economic losses of $ 7000 million due to atmospheric corrosion are incurred, some of which can be avoided by technological advances and improved corrosion protection measures. When the steel structure is used in the atmosphere, the steel material interacts with moisture, oxygen and other pollutants in the atmosphere to generate chemical and electrochemical reactions, so that the steel structure is corroded. When the air humidity is above 50% -70% (called critical humidity), a complete thin liquid film is formed on the surface of the steel, and the steel is subjected to electrochemical corrosion under the thin liquid film. The main environmental factors affecting the atmospheric corrosion of steel are: temperature, relative humidity, sulfur dioxide content, salt particle content, and the like. Because the transmission towers are in different natural environments, the existing anticorrosive paint has better anticorrosive performance only in certain areas and poorer universality.
Among various anticorrosion techniques, the coating anticorrosion technique is most widely used. The paint is convenient to construct, good in colorability, strong in applicability, free from the limitation of structure and shape and low in cost; and it can be used with other antiseptic measures to obtain better antiseptic effect. The corrosion-resistant effect of the paint is influenced by the surface treatment effect, the paint variety, the matching system, the paint construction quality and the like. The development of the coating in China is still in the initial stage, and when the coating in the prior art is sprayed: the coating system is not properly selected and is not suitable for the transmission tower; uneven coating thickness, poor adhesion with the metal matrix, and the like. In the prior art, the long-acting anticorrosive paint generally consists of a primer, an intermediate paint and a finish paint, and has a complex using process and higher construction requirements. Therefore, the development of an anticorrosive paint specially used for a power transmission grid is urgently needed. For the protection of the power transmission tower, the selection of an anticorrosive coating and the early surface treatment are critical.
The Chinese patent application (CN 201110403868.2) provides a novel preparation method of an anticorrosion transmission special tower, wherein the coating is a composite coating taking fluororesin and polyphenylene sulfide resin as main components, the service life of the coating can reach more than 30 years, however, the polyphenylene sulfide resin content in the coating is high, the polyphenylene sulfide has a molecular structure which makes the coating hard and brittle, meanwhile, the finish coat is a pure fluorine coating, the surface tension of the pure fluorine coating is small, the wetting is difficult, the coating is not easily dispersed during use, the leveling property is poor, the prepared coating is uneven in thickness, and the existing coating needs primer, intermediate paint and finish coat and has larger coating thickness. The existing epoxy zinc-rich primer has poor adhesion on the surface of a steel structure due to low surface energy of a zinc layer, and is often required to be coated again in a short time. The existing zinc-rich epoxy resin has high zinc content, good initial adhesion but poor durability; meanwhile, the epoxy resin is modified by the inorganic filler, and the nano inorganic filler is added, so that the nano inorganic filler is easy to adsorb and agglomerate, and the performance of the coating is reduced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an anticorrosive coating special for a power transmission tower.
The invention also provides a preparation method of the special anticorrosive paint for the transmission tower.
The technical scheme adopted by the invention for realizing the purpose is as follows:
the invention provides an anticorrosive paint special for a power transmission tower, which comprises a primer and a finish;
the primer consists of the following raw materials in parts by weight: 50-60 parts of epoxy resin, 10-15 parts of n-butyl titanate, 5-8 parts of chromium acetylacetonate, 12-15 parts of polyvinyl formal and 70-80 parts of zinc powder;
the finish paint is prepared from the following raw materials in parts by weight: 55-60 parts of tetrafluoroethylene, 5-10 parts of dicyclohexylmethane diisocyanate, 8-10 parts of acrylate, 1-2 parts of acrylic acid, 10-15 parts of methyl isobutyl ketone, 0.2-0.5 part of azodiisobutyronitrile and 0.1-0.2 part of dibutyltin dilaurate.
The invention also provides a preparation method of the special anticorrosive paint for the transmission tower, which comprises the following steps:
the preparation method of the primer comprises the following steps:
(1) adding n-butyl alcohol into chromium acetylacetonate, dropwise adding n-butyl titanate under the stirring state, adding mercaptopropyltriethoxysilane after dropwise adding is finished, uniformly stirring, adding into a reaction kettle, reacting, and obtaining a mixed solution after reaction is finished;
(2) heating the epoxy resin to 100-120 ℃, then slowly adding the mixed solution, continuously stirring, and stirring for 1-2h at the constant temperature to obtain the modified epoxy resin;
(3) uniformly mixing the modified epoxy resin, the polybutene pure formal, the zinc powder and the mixed solution;
the preparation method of the finish paint comprises the following steps:
firstly, vacuumizing a polymerization reaction kettle, replacing nitrogen, mixing dicyclohexylmethane diisocyanate, acrylic ester and acrylic acid, slowly adding azobisisobutyronitrile and dibutyltin dilaurate under the stirring condition, and stirring to obtain a uniform mixed solution;
secondly, sucking methyl isobutyl ketone into the reaction kettle in vacuum, heating to 70 ℃, adding the mixed solution into the reaction kettle, stirring, introducing the tetrafluoroethylene monomer in parts by weight into the reaction kettle, reacting, cooling to room temperature after the reaction is finished, and stopping stirring to obtain the product.
Further, in the step (1), the volume ratio of n-butanol to n-butyl titanate is 20: 1.
furthermore, the addition amount of the mercaptopropyltriethoxysilane accounts for 0.025 percent of the mixed solution of the n-butyl titanate, the chromium acetylacetonate and the n-butyl alcohol.
Further, the reaction is a step reaction: firstly, the temperature is raised to 70-80 ℃ at the heating rate of 1 ℃/min, then the temperature is raised to 110-120 ℃ at the heating rate of 5 ℃/min, and the heat preservation reaction is carried out for 12 h.
Further, in the step II, the reaction is carried out for 25-28h in vacuum atmosphere at the temperature of 70-75 ℃ and under the pressure of 10-15 MPa.
The paint provided by the invention can be sprayed by a steel structure.
The method comprises the steps of firstly preparing a sol-gel solution of titanium dioxide, carrying out surface modification on the titanium dioxide by using mercaptopropyltriethoxysilane, then adding the modified titanium dioxide into epoxy resin, and preparing the epoxy resin coating by using the mercaptopropyltriethoxysilane as a connecting agent, wherein the titanium dioxide is not agglomerated in an epoxy resin system and has good dispersion performance, and the prepared epoxy resin coating improves the compatibility of the epoxy resin coating by forming a chemical bond between the epoxy resin and the titanium dioxide.
The finish paint prepared by the invention adopts isothermal and isobaric polymerization, the decomposition rate of the initiator is increased faster than the chain growth rate at higher temperature, the free radicals are increased, the double-radical disproportionation is facilitated, when the temperature is too low, the rate of the initiator decomposing to generate primary free radicals is slow, the balance of a later reaction system is difficult to form, when the temperature is too high, the initiator is decomposed in a short time, and the later controllability is lost. The invention leads the polymerization reaction to tend to ideal copolymerization under higher reaction pressure, improves the pressure of a reaction system, promotes intermolecular collision, accelerates the polymerization reaction, improves the yield and the molecular weight of the polymer, and leads the formed branched-chain type macromolecules to be gathered together by van der Waals force under the action of temperature, pressure and the like, and has weaker intermolecular force, and improves the solubility property. The invention has the advantages of isothermal and isobaric polymerization, consistent structure, molecular weight and viscosity of the polymer, stable quality of the polymer, really achieving alternate polymerization and better polymer performance.
The invention has the beneficial effects that:
(1) according to the invention, through the modified epoxy resin, the prepared primer has good adhesion with steel components of a power transmission tower, good adhesion, excellent electrochemical or chemical anticorrosion function, short curing time and good durability, and the weather resistance and the corrosion resistance of the coating are improved;
(2) the finish paint provided by the invention is simple to spray, good in coating thickness controllability, good in weather resistance, resistant to ultraviolet damage and wide in adaptability.
(3) The invention adds the inorganic filler of sol-gel into the epoxy resin to obtain the final mutual transmission network structure of inorganic substance and polymer, thereby enhancing the bonding force of the bond.
Detailed Description
The technical solution of the present invention is further explained and illustrated by the following specific examples.
Example 1
A special anticorrosive paint for transmission towers: the primer formula comprises: 58 parts of epoxy resin, 12 parts of n-butyl titanate, 8 parts of chromium acetylacetonate, 12 parts of polyvinyl formal and 70 parts of zinc powder;
the preparation method comprises the following steps:
(1) adding 240 parts of n-butanol into chromium acetylacetonate, dropwise adding n-butyl titanate under the stirring state, adding 0.065 parts of mercaptopropyltriethoxysilane after dropwise adding, uniformly stirring, adding into a reaction kettle, firstly heating to 70-80 ℃ at the heating rate of 1 ℃/min, then heating to 110-120 ℃ at the heating rate of 5 ℃/min, and carrying out heat preservation reaction for 12h
Obtaining mixed liquid after the reaction is finished;
(2) heating the epoxy resin to 100-120 ℃, slowly adding the mixed solution, continuously stirring, and stirring for 2 hours at the constant temperature to obtain modified epoxy resin;
(3) uniformly mixing the modified epoxy resin, the polybutene pure formal, the zinc powder and the mixed solution;
the formula of the finish paint is as follows: 60 parts of tetrafluoroethylene, 8 parts of dicyclohexylmethane diisocyanate, 8 parts of acrylate, 2 parts of acrylic acid, 15 parts of methyl isobutyl ketone, 0.5 part of azodiisobutyronitrile and 0.1 part of dibutyltin dilaurate;
the preparation method comprises the following steps:
firstly, vacuumizing a polymerization reaction kettle, replacing nitrogen, mixing dicyclohexylmethane diisocyanate, acrylic ester and acrylic acid, slowly adding azobisisobutyronitrile and dibutyltin dilaurate under the stirring condition, and stirring to obtain a uniform mixed solution;
secondly, sucking methyl isobutyl ketone into the reaction kettle in vacuum, heating to 70 ℃, adding the mixed solution into the reaction kettle, stirring, introducing the tetrafluoroethylene monomer in parts by weight into the reaction kettle, carrying out heat preservation reaction for 25 hours under the conditions that the temperature is 70-75 ℃ and the pressure is 10-15MPa, cooling to room temperature after the reaction is finished, and stopping stirring to obtain the product.
Example 2
A special anticorrosive paint for transmission towers: the primer formula comprises: 50 parts of epoxy resin, 11 parts of n-butyl titanate, 5 parts of chromium acetylacetonate, 12-15 parts of polyvinyl formal and 75 parts of zinc powder;
the preparation method comprises the following steps:
(1) adding 220 parts of n-butyl alcohol into chromium acetylacetonate, dropwise adding n-butyl titanate under a stirring state, adding 0.059 part of mercaptopropyltriethoxysilane after dropwise adding, uniformly stirring, adding into a reaction kettle, firstly heating to 70-80 ℃ at a heating rate of 1 ℃/min, then heating to 110-120 ℃ at a heating rate of 5 ℃/min, carrying out heat preservation reaction for 12 hours, and obtaining a mixed solution after the reaction is finished;
(2) heating the epoxy resin to 100-120 ℃, slowly adding the mixed solution, continuously stirring, and stirring for 2 hours at the constant temperature to obtain modified epoxy resin;
(3) uniformly mixing the modified epoxy resin, the polybutene pure formal, the zinc powder and the mixed solution;
the formula of the finish paint is as follows: 55 parts of tetrafluoroethylene, 5 parts of dicyclohexylmethane diisocyanate, 10 parts of acrylic ester, 2 parts of acrylic acid, 10 parts of methyl isobutyl ketone, 0.3 part of azodiisobutyronitrile and 0.2 part of dibutyltin dilaurate;
the preparation method is the same as example 1.
Example 3
A special anticorrosive paint for transmission towers: the primer formula comprises: 60 parts of epoxy resin, 15 parts of n-butyl titanate, 8 parts of chromium acetylacetonate, 12-15 parts of polyvinyl formal and 80 parts of zinc powder;
the preparation method comprises the following steps:
(1) adding 300 parts of n-butanol into acetylacetone chromium, dropwise adding n-butyl titanate under stirring, adding 0.081 parts of mercaptopropyltriethoxysilane after dropwise adding, uniformly stirring, adding into a reaction kettle, firstly heating to 70-80 ℃ at a heating rate of 1 ℃/min, then heating to 110-120 ℃ at a heating rate of 5 ℃/min, carrying out heat preservation reaction for 12h,
obtaining mixed liquid after the reaction is finished;
(2) heating the epoxy resin to 100-120 ℃, slowly adding the mixed solution, continuously stirring, and stirring for 2 hours at the constant temperature to obtain modified epoxy resin;
(3) uniformly mixing the modified epoxy resin, the polybutene pure formal, the zinc powder and the mixed solution;
the formula of the finish paint is as follows: 58 parts of tetrafluoroethylene, 10 parts of dicyclohexylmethane diisocyanate, 8 parts of acrylate, 1 part of acrylic acid, 13 parts of methyl isobutyl ketone, 0.2 part of azodiisobutyronitrile and 0.2 part of dibutyltin dilaurate;
the preparation method is the same as example 1.
Comparative example 1
A special anticorrosive paint for transmission towers: the primer formula comprises: 58 parts of epoxy resin, 12 parts of n-butyl titanate, 8 parts of chromium acetylacetonate and 70 parts of zinc powder;
the preparation method comprises the following steps:
(1) adding 240 parts of n-butyl alcohol into chromium acetylacetonate, dropwise adding n-butyl titanate under a stirring state, adding 0.065 parts of mercaptopropyltriethoxysilane after dropwise adding, uniformly stirring, adding into a reaction kettle, firstly heating to 70-80 ℃ at a heating rate of 1 ℃/min, then heating to 110-120 ℃ at a heating rate of 5 ℃/min, carrying out heat preservation reaction for 12 hours, and obtaining a mixed solution after the reaction is finished;
(2) heating the epoxy resin to 100-120 ℃, slowly adding the mixed solution, continuously stirring, and stirring for 2 hours at the constant temperature to obtain modified epoxy resin;
(3) uniformly mixing the modified epoxy resin, the zinc powder and the mixed solution;
the formula of the finish paint is as follows: 60 parts of tetrafluoroethylene, 8 parts of dicyclohexylmethane diisocyanate, 8 parts of acrylate, 2 parts of acrylic acid, 15 parts of methyl isobutyl ketone and 0.5 part of azobisisobutyronitrile;
the preparation method comprises the following steps:
firstly, vacuumizing a polymerization reaction kettle, replacing nitrogen, mixing dicyclohexylmethane diisocyanate, acrylate and acrylic acid with tin, and stirring to obtain a uniform mixed solution;
secondly, sucking methyl isobutyl ketone into the reaction kettle in vacuum, heating to 70 ℃, adding the mixed solution into the reaction kettle, stirring, introducing the tetrafluoroethylene monomer in parts by weight into the reaction kettle, carrying out heat preservation reaction for 25 hours under the conditions that the temperature is 70-75 ℃ and the pressure is 10-15MPa, cooling to room temperature after the reaction is finished, and stopping stirring to obtain the product.
Comparative example 2
A special anticorrosive paint for transmission towers: the primer formula comprises: 58 parts of epoxy resin, 12 parts of n-butyl titanate, 8 parts of chromium acetylacetonate, 12 parts of polyvinyl formal and 70 parts of zinc powder;
the preparation method comprises the following steps:
(1) adding 240 parts of ethanol into chromium acetylacetonate, dropwise adding n-butyl titanate under a stirring state, adding 0.065 parts of mercaptopropyltriethoxysilane after dropwise adding, uniformly stirring, adding into a reaction kettle, heating to 110 ℃ and 120 ℃ at a heating rate of 5 ℃/min, reacting for 12 hours, and obtaining a mixed solution after the reaction is finished;
(2) heating the epoxy resin to 100-120 ℃, slowly adding the mixed solution, continuously stirring, and stirring for 2 hours at the constant temperature to obtain modified epoxy resin;
(3) uniformly mixing the modified epoxy resin, the polybutene pure formal, the zinc powder and the mixed solution;
the formula of the finish paint is as follows: 60 parts of tetrafluoroethylene, 8 parts of acrylate, 2 parts of acrylic acid, 15 parts of methyl isobutyl ketone, 0.5 part of azodiisobutyronitrile and 0.1 part of dibutyltin dilaurate;
the preparation method comprises the following steps:
firstly, vacuumizing a polymerization reaction kettle, replacing nitrogen, mixing dicyclohexylmethane diisocyanate, acrylic ester and acrylic acid, slowly adding azobisisobutyronitrile and dibutyltin dilaurate under the stirring condition, and stirring to obtain a uniform mixed solution;
secondly, sucking methyl isobutyl ketone into the reaction kettle in vacuum, heating to 70 ℃, adding the mixed solution into the reaction kettle, stirring, introducing the tetrafluoroethylene monomer in parts by weight into the reaction kettle, carrying out heat preservation reaction for 25 hours under the conditions that the temperature is 70-75 ℃ and the pressure is 10-15MPa, cooling to room temperature after the reaction is finished, and stopping stirring to obtain the product.
Comparative example 3
A special anticorrosive paint for transmission towers: the primer formulation and preparation method were the same as in example 1.
The formula of the finish paint is as follows: 60 parts of tetrafluoroethylene, 8 parts of dicyclohexylmethane diisocyanate, 8 parts of acrylate, 2 parts of acrylic acid, 15 parts of methyl isobutyl ketone and 0.5 part of azobisisobutyronitrile;
the preparation method comprises the following steps:
firstly, vacuumizing a polymerization reaction kettle, replacing nitrogen, mixing dicyclohexylmethane diisocyanate, acrylate and acrylic acid with tin, and stirring to obtain a uniform mixed solution;
secondly, sucking methyl isobutyl ketone into the reaction kettle in vacuum, adding the mixed solution into the reaction kettle, stirring, introducing the tetrafluoroethylene monomer in parts by weight into the reaction kettle, heating, carrying out heat preservation reaction for 25 hours at the temperature of 70-75 ℃ and under the pressure of 10-15MPa, cooling to room temperature after the reaction is finished, and stopping stirring to obtain the product.
Comparative example 4
A special anticorrosive paint for transmission towers: the primer formula comprises: 58 parts of epoxy resin, 20 parts of n-butyl titanate, 12 parts of polyvinyl formal and 70 parts of zinc powder;
the preparation method comprises the following steps:
(1) dropping 240 parts of n-butyl titanate into 240 parts of n-butyl titanate under the stirring state, adding 0.065 part of mercaptopropyltriethoxysilane after dropping, uniformly stirring, adding into a reaction kettle, firstly heating to 70-80 ℃ at the heating rate of 1 ℃/min, then heating to 110-120 ℃ at the heating rate of 5 ℃/min, and carrying out heat preservation reaction for 12h
Obtaining mixed liquid after the reaction is finished;
(2) heating the epoxy resin to 100-120 ℃, slowly adding the mixed solution, continuously stirring, and stirring for 2 hours at the constant temperature to obtain modified epoxy resin;
(3) the modified epoxy resin, the polybutene formal, the zinc powder and the mixed solution are mixed uniformly.
The formula and preparation method of the finish paint are the same as those of example 1.
Comparative example 5
A special anticorrosive paint for transmission towers: the primer formula comprises: 58 parts of epoxy resin, 20 parts of chromium acetylacetonate, 12 parts of polyvinyl formal and 70 parts of zinc powder;
the preparation method comprises the following steps:
(1) adding 240 parts of n-butanol into chromium acetylacetonate, adding 0.065 part of mercaptopropyltriethoxysilane, uniformly stirring, adding into a reaction kettle, firstly heating to 70-80 ℃ at the heating rate of 1 ℃/min, then heating to 110-120 ℃ at the heating rate of 5 ℃/min, and carrying out heat preservation reaction for 12h
Obtaining mixed liquid after the reaction is finished;
(2) heating the epoxy resin to 100-120 ℃, slowly adding the mixed solution, continuously stirring, and stirring for 2 hours at the constant temperature to obtain modified epoxy resin;
(3) uniformly mixing the modified epoxy resin, the polybutene pure formal, the zinc powder and the mixed solution;
the formula and preparation method of the finish paint are the same as those of example 1.
Effects of the embodiment
The primer and the finish paint provided by the invention are sprayed on steel structural components of a power transmission tower, 2 primer and 2 finish paints are sprayed by air, and the thickness of each paint film is 30-50 mu m.
The impact resistance, adhesion and hardness of the primer sprayed on the examples and the comparative examples are detected, and the specific results are shown in table 1.
TABLE 1
Secondly, detecting a paint film formed after spraying the primer and the finish paint, wherein the specific detection method comprises the following steps:
(1) the appearance of the paint film is as follows: visual inspection
(2) Ultraviolet resistance: irradiating the sample by a fluorescent ultraviolet lamp with the wavelength of 340nm for 2000 h;
(3) alkali resistance: soaking NaOH at 0.2M at room temperature;
(4) acid resistance: soaking in 0.1M sulfuric acid at room temperature;
(5) solvent resistance: soaking the absorbent cotton balls in xylene, placing the absorbent cotton balls on a coating film, wherein the contact area is not less than 1 square centimeter, and removing the cotton balls after the specified test time is reached;
(6) salt spray resistance: coatings having a total coating thickness of more than 200 μm were measured using a 2mm grid method;
(7) cold and heat cycle resistance: 910 deg.C, 4h → room temperature, 0.5h → -30 deg.C, 1.5h → room temperature, 0.5h is a cycle, and the process is repeated
The specific test results are shown in Table 2.
TABLE 2
And thirdly, carrying out an electrochemical test on the primers prepared in the examples 1 to 3 and the comparative examples 1 to 5 to test the corrosion current density, and meanwhile, soaking the steel structure coated with the coating in a 3.5% sodium chloride solution for 20 days to carry out impedance value detection, wherein specific results are shown in Table 3.
TABLE 3
Claims (6)
1. The special anticorrosive paint for the power transmission iron tower is characterized by comprising a primer and a finish;
the primer consists of the following raw materials in parts by weight: 50-60 parts of epoxy resin, 10-15 parts of n-butyl titanate, 5-8 parts of chromium acetylacetonate, 12-15 parts of polyvinyl formal and 70-80 parts of zinc powder;
the finish paint is prepared from the following raw materials in parts by weight: 55-60 parts of tetrafluoroethylene, 5-10 parts of dicyclohexylmethane diisocyanate, 8-10 parts of acrylate, 1-2 parts of acrylic acid, 10-15 parts of methyl isobutyl ketone, 0.2-0.5 part of azodiisobutyronitrile and 0.1-0.2 part of dibutyltin dilaurate.
2. The preparation method of the special anticorrosive paint for the transmission tower as claimed in claim 1, wherein the preparation method of the primer comprises the following steps:
(1) adding n-butyl alcohol into chromium acetylacetonate, dropwise adding n-butyl titanate under the stirring state, adding mercaptopropyltriethoxysilane after dropwise adding is finished, uniformly stirring, adding into a reaction kettle, reacting, and obtaining a mixed solution after reaction is finished;
(2) heating the epoxy resin to 100-120 ℃, then slowly adding the mixed solution, continuously stirring, and stirring for 1-2h at the constant temperature to obtain the modified epoxy resin;
(3) uniformly mixing the modified epoxy resin, the polybutene pure formal, the zinc powder and the mixed solution;
the preparation method of the finish paint comprises the following steps:
firstly, vacuumizing a polymerization reaction kettle, replacing nitrogen, mixing dicyclohexylmethane diisocyanate, acrylic ester and acrylic acid, slowly adding azobisisobutyronitrile and dibutyltin dilaurate under the stirring condition, and stirring to obtain a uniform mixed solution;
secondly, sucking methyl isobutyl ketone into the reaction kettle in vacuum, heating to 70 ℃, adding the mixed solution into the reaction kettle, stirring, introducing the tetrafluoroethylene monomer in parts by weight into the reaction kettle, reacting, cooling to room temperature after the reaction is finished, and stopping stirring to obtain the product.
3. The production method according to claim 2, wherein in the step (1), the volume ratio of n-butanol to n-butyl titanate is 20: 1.
4. the method according to claim 2 or 3, wherein the mercaptopropyltriethoxysilane is added in an amount of 0.025% based on the mixture of n-butyl titanate, chromium acetylacetonate and n-butanol.
5. The method of claim 4, wherein the reaction is a staged reaction: firstly, the temperature is raised to 70-80 ℃ at the heating rate of 1 ℃/min, then the temperature is raised to 110-120 ℃ at the heating rate of 5 ℃/min, and the heat preservation reaction is carried out for 12 h.
6. The preparation method according to claim 2, wherein in the step (II), the reaction is carried out in vacuum atmosphere at 70-75 ℃ and 10-15MPa for 25-28 h.
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