CN113337212B - High-performance anticorrosive composite coating and preparation method thereof - Google Patents
High-performance anticorrosive composite coating and preparation method thereof Download PDFInfo
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- 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
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
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- 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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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract
A high-performance anticorrosive composite coating comprises the following components in parts by weight: 30-45 parts of fluororesin monomer, 30-45 parts of styrene monomer, 10-40 parts of hexamethylcyclotrisiloxane monomer, 4-8 parts of polyethylene glycol octyl phenyl ether, 4-6 parts of polyethylene glycol, 3-8 parts of polyethylene glycol stearate, 20-30 parts of water glass, 100-containing materials of 150 parts of fly ash, 2-4 parts of initiator, 100-containing materials of 200 parts of water, 1-3 parts of defoaming powder, 5-10 parts of sericite powder, 0.2-0.5 part of water reducing agent, 5-8 parts of dispersing agent and 3-7 parts of flatting agent; and a preparation method of the high-performance high-corrosion-resistance composite coating. The modified fluororesin emulsion with improved durability is synthesized and prepared in an efficient and environment-friendly manner, and the compressive strength, tensile strength, low permeability, alkali resistance and good corrosion resistance of concrete can be effectively improved by the composite coating obtained by fully mixing and stirring the modified fluororesin and the alkali-activated fly ash.
Description
Technical Field
The invention relates to an anticorrosive coating and a preparation method thereof, in particular to a high-performance anticorrosive composite coating and a preparation method thereof.
Background
In building structures, corrosion often threatens the durability of the structures, reduces the service life of the buildings and seriously loses the structures, so the corrosion prevention of the structures is more and more concerned. The main measures for corrosion prevention of structures are bulk modification and surface coating techniques. The body modification has the problems of high cost, environmental pollution and the like, but the operation of the surface coating is simple, and the anticorrosion effect is effective and accurate, so that the anticorrosion coating plays an indispensable role in the durability of concrete.
The anti-corrosion coating mainly comprises an organic anti-corrosion coating and an inorganic anti-corrosion coating, wherein the inorganic coating has the advantages of low cost, good safety, easy maintenance and the like, but has the defects of no ductility, low tensile strength, poor adhesion, high hardness, easy cracking and the like; the organic coating has the advantages of good flexibility and the like, but also has the defects of easy volatilization, environmental pollution, high cost, poor extensibility, easy influence of environmental temperature and the like. The composite coating can just make up the shortages of the organic coating and the inorganic coating, is synthesized by taking the organic coating and the inorganic coating as raw materials, and has great development potential in the coating industry.
The water glass can react with the fly ash through alkali activation reaction to generate C-S-H gel, has good rigidity, can effectively avoid the use of common cement, and achieves the purposes of protecting the environment and saving energy. The polymer has good flexibility, and the combination of the advantage of good rigidity of alkali activation reaction enables the coating to show good macroscopic performance and microstructure.
Chinese patent CN111167686A discloses a long-acting anticorrosive coating on the surface of copper alloy and a preparation method thereof, in the invention, a copper electrode sample is taken as a substrate, firstly, a nano-copper structure is electrodeposited on a bare copper substrate, secondly, copper with the nano-structure is oxidized, and finally, oleic acid is injected into the surface of the oxidized substrate and is placed in an oven to be kept at a constant temperature for 8-12h to form the anticorrosive coating on the copper alloy. However, the electrodeposition method has high process requirements, and must be carried out under certain electrolyte and operation conditions, and the synthesis is easily affected by factors such as pH value, temperature, current density and the like;
chinese patent CN105665258A discloses an anticorrosive coating for a chemical storage tank and a construction method thereof, the anticorrosive coating mainly comprises a primer layer and a spray polyurea layer, the inner wall of the chemical storage tank connected with the primer layer is obtained by sand blasting or sand blasting and acid pickling in sequence, and the influence of seams on corrosion resistance failure can be effectively eliminated. But the thickness of the coating is difficult to control accurately, the uniformity of the coating is difficult to ensure, and the process is complex.
Chinese patent CN107931062A discloses a preparation method of a wear-resistant and anti-corrosion coating on the surface of a sintered neodymium-iron-boron magnet, which is mainly characterized in that the sintered neodymium-iron-boron magnet is preheated, then a prepared wear-resistant and anti-corrosion coating material is coated on the surface of the sintered neodymium-iron-boron magnet by adopting an electrostatic spraying process and is subjected to curing treatment, and the wear-resistant and anti-corrosion coating prepared by combining an organic polymer material has more excellent mechanical property and corrosion resistance. But the preparation of the coating is high in requirement on the alignment working environment, and the spraying process is difficult to control.
Disclosure of Invention
One of the purposes of the invention is to provide a high-performance anticorrosive composite coating, which is safe, energy-saving and environment-friendly in raw materials, and can effectively improve the compressive strength, tensile strength, low permeability, alkali resistance and good anticorrosive performance of concrete.
The invention also aims to provide a preparation method of the high-performance anticorrosive composite coating, which can combine the organic modified polymer and the inorganic alkali activated waste residue to prepare the coating with good toughness, aging resistance, water immersion resistance and tensile property.
The scheme adopted by the invention for realizing one of the purposes is as follows:
a high-performance anticorrosive composite coating comprises the following components in parts by weight: 30-45 parts of fluororesin monomer, 30-45 parts of styrene monomer, 10-40 parts of hexamethylcyclotrisiloxane monomer, 4-8 parts of polyethylene glycol octyl phenyl ether, 4-6 parts of polyethylene glycol, 3-8 parts of polyethylene glycol stearate, 20-30 parts of water glass, 100-containing materials, 150 parts of fly ash, 2-4 parts of initiator, 100-containing materials, 200 parts of water, 1-3 parts of defoaming powder, 5-10 parts of sericite powder, 0.2-0.5 part of water reducing agent, 5-8 parts of dispersing agent and 3-7 parts of flatting agent.
In the above technical scheme, the fluororesin monomer is chlorotrifluoroethylene or tetrafluoroethylene.
In the technical scheme, the mass-average molecular weight of the polyethylene glycol is 400, 600 or 800.
In the technical scheme, the polyethylene glycol stearate is polyethylene glycol hydroxystearate or polyethylene glycol dilaurate or polyethylene glycol glyceryl stearate.
In the technical scheme, the initiator is azobisisobutyronitrile or azobisisoheptonitrile.
In the technical scheme, the defoaming agent is a high-alcohol defoaming agent or a polyether defoaming agent, and specifically is a phenethyl alcohol oleate or lauryl phenylacetate or GPE defoaming agent; the water reducing agent is a polycarboxylic acid high-performance water reducing agent or a fatty acid high-efficiency water reducing agent, in particular a polycarboxylic acid water reducing agent or an HSB fat water reducing agent; the dispersing agent is triethyl hexyl phosphoric acid or sodium dodecyl sulfate or methyl amyl alcohol; the flatting agent is acrylic acid, organic silicon or fluorocarbon, and specifically is polydimethylsiloxane or melamine formaldehyde resin.
The fluororesin monomer is selected, so that the heat stability and the corrosion resistance are better; the styrene monomer has the function of improving the hydrophobicity of the coating; the hexamethylcyclotrisiloxane monomer has the functions of improving the toughness of the polymer, optimizing the connection of styrene and a fluorine-containing chain segment and promoting the synthesis reaction of the block polymer; the polyethylene glycol octyl phenyl ether is used as a nonionic surfactant, so that the size and the morphology of polymer particles are optimized, and the film forming property of the polymer is improved; the polyethylene glycol is used as a solution thickener to adjust the rheological property of the emulsion; the polyethylene glycol stearate serves as an emulsion stabilizer, so that the stability of an emulsion system in the reaction process is ensured, and the high-efficiency reaction is ensured; the water glass is used for providing an alkaline environment for the fly ash to carry out activation treatment; the fly ash is used as powder in the coating to improve the water resistance of the coating; the initiator is used for promoting the formation of the emulsion, the defoaming powder is used for inhibiting the generation of bubbles and accelerating the breaking of the generated bubbles, the sericite powder is used for filling the fluororesin, the water reducing agent is used for preventing the prepared coating from being bonded, the dispersing agent is used for dispersing particles needing to be dispersed in the coating on the surface, so that the stability of the coating is improved, and the leveling agent is used for improving the leveling property and the uniformity of the coating.
The second scheme adopted by the invention for achieving the purpose is as follows:
(1) weighing 30-45 parts of fluororesin monomer, 30-45 parts of styrene monomer and 10-40 parts of hexamethylcyclotrisiloxane monomer, uniformly mixing, adding into a solution consisting of 4-8 parts of polyethylene glycol octyl phenyl ether, 4-6 parts of polyethylene glycol, 3-8 parts of polyethylene glycol stearate and 100-200 parts of water, weighing 5-10 parts of sericite powder, 2-4 parts of initiator and 1-3 parts of defoamer, uniformly mixing, adding into the solution, and carrying out water bath constant temperature wet grinding until uniform mixing is achieved to obtain modified fluororesin emulsion;
(2) weighing 100 parts of fly ash and 150 parts of fly ash and 20-30 parts of water glass, mixing and stirring, slowly adding 30-45 parts of water and 0.2-0.5 part of water reducing agent, and uniformly mixing to obtain water glass activated fly ash;
(3) and (2) weighing 50-130 parts of the modified fluororesin emulsion obtained in the step (1), 70-150 parts of the water glass activated fly ash obtained in the step (2), 5-8 parts of a dispersing agent and 3-7 parts of a flatting agent, and uniformly mixing and stirring to obtain the high-performance anticorrosive composite coating.
In the technical scheme, in the step (1), the constant temperature of the water bath is 40-60 ℃, wet grinding is carried out in a sealed state, the wet grinding time is 40-60min, wet grinding balls are steel balls or ceramic balls or agate balls, and the diameter of the wet grinding balls is 1-3 mm.
In the technical scheme, in the step (2), the mixing time of the fly ash and the water glass is 1-3min, and the mixing time after the water and the water reducing agent are added is 2-4 min.
In the above technical scheme, in the step (3), the mixing and stirring is magnetic heating and stirring, the stirring temperature is 100 ℃ and 200 ℃, and the stirring time is 30-60 min.
Compared with a single fluororesin monomer, the fluororesin monomer is modified by the styrene monomer and the hexamethylcyclotrisiloxane monomer in the using process, the obtained polymer can effectively overcome the compatibility problem, the formed triblock polymer realizes functions through different chemical characteristics of each chain segment, the fluororesin is used for realizing hydrophobicity, the styrene is used for realizing the hardness and van der Waals adsorption of the chain segment, and the hexamethylcyclotrisiloxane monomer is used for realizing the flexibility of the chain segment, so that the film forming property of the synthesized polymer in the organic-inorganic composite material is ensured, and the interface compatibility and the adhesion property of the synthesized polymer are improved. The special liquid-phase grinding ball is adopted to carry out the oscillation activation reaction, the specificity and the high efficiency of the organic reaction are considered, the reaction environment needs to be strictly controlled, although the general grinding ball can also provide the mechanical energy and the activation energy required by the oscillation activation reaction, the reaction needs to be carried out at a reasonable reaction rate and at high-purity reaction sites, and therefore, a special grinding ball with higher purity and more stable surface is needed to assist the organic reaction. The water glass provides alkalinity for activating reaction and promotes the excitation of the activity of the fly ash. The modified polymer and the fly ash activated by alkali can be chemically combined through the silicon-containing chain segment on the polymer, so that the effect of a stable and effective composite material is achieved.
The invention has the beneficial effects that:
(1) the modified fluororesin emulsion with improved durability is synthesized and prepared in an efficient and environment-friendly manner, the temperature control precision of a water bath thermostat is high, the temperature condition is convenient and is uniformly distributed, and the modified fluororesin emulsion is obtained through special grinding ball oscillation activation reaction.
(2) Under the high-temperature stirring action of a magnetic heating stirrer, the modified fluororesin and the alkali-activated fly ash are fully mixed and stirred to obtain the composite coating, so that the compressive strength, the tensile strength, the low permeability, the alkali resistance and the good corrosion resistance of the concrete can be effectively improved.
(3) The composite coating has simple and various construction modes, good construction effect and easy control of the adhesion performance and the surface characteristic of the coating. Has good environmental protection and economy.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
(1) Weighing 30 parts of fluororesin monomer, 30 parts of styrene monomer and 40 parts of hexamethylcyclotrisiloxane monomer, uniformly mixing, adding into a solution consisting of 4 parts of polyethylene glycol octyl phenyl ether, 4 parts of polyethylene glycol, 3 parts of polyethylene glycol stearate and 100 parts of water, weighing 5 parts of sericite powder, 2 parts of azodiisobutyronitrile and 1 part of lauryl phenylacetate, uniformly mixing, adding into the solution, carrying out water bath constant temperature wet grinding until uniform mixing is achieved, and obtaining the modified fluororesin emulsion, wherein the water bath constant temperature is 40 ℃, the wet grinding time is 60min by using a planetary ball mill in a sealed state, the wet grinding ball is a steel ball, and the diameter of the wet grinding ball is 1 mm.
(2) Weighing 100 parts of fly ash and 20 parts of water glass, mixing and stirring for 1min, slowly adding 45 parts of water and 0.2 part of polycarboxylic acid water reducing agent, mixing and stirring for 2min until the mixture is uniform, and obtaining the water glass activated fly ash.
(3) Weighing 50 parts of the modified fluororesin emulsion obtained in the step (1), 70 parts of the water glass activated fly ash obtained in the step (2), 5 parts of triethylhexylphosphoric acid and 3 parts of melamine formaldehyde resin, placing the beaker into a magnetic heating stirrer, and fully and uniformly mixing and stirring to obtain the high-performance anticorrosive composite coating, wherein the stirring temperature is 100 ℃ and the stirring time is 60 min.
Example 2
(1) Weighing 35 parts of fluororesin monomer, 35 parts of styrene monomer and 25 parts of hexamethylcyclotrisiloxane monomer, uniformly mixing, adding into a solution consisting of 5 parts of polyethylene glycol octyl phenyl ether, 5 parts of polyethylene glycol stearate and 120 parts of water, weighing 6 parts of sericite powder, 3 parts of azodiisoheptonitrile and 2 parts of phenethyl alcohol oleate, uniformly mixing, adding into the solution, carrying out water bath constant temperature wet grinding until uniform mixing is achieved, and obtaining the modified fluororesin emulsion, wherein the water bath constant temperature is 45 ℃, the wet grinding time is 45min by using a planetary ball mill in a sealed state, the wet grinding balls are ceramic balls, and the diameter of the wet grinding balls is 1 mm.
(2) Weighing 150 parts of fly ash and 25 parts of water glass, mixing and stirring for 1min, slowly adding 30 parts of water and 0.3 part of HSB fat water reducing agent, mixing and stirring for 3min till mixing uniformly to obtain the water glass activated fly ash.
(3) And (2) weighing 60 parts of the modified fluororesin emulsion obtained in the step (1), 80 parts of the water glass activated fly ash obtained in the step (2), 6 parts of sodium dodecyl sulfate and 4 parts of polydimethylsiloxane, placing the beaker in a magnetic heating stirrer, and fully mixing and stirring uniformly to obtain the high-performance anticorrosive composite coating, wherein the stirring temperature is 150 ℃ and the stirring time is 45 min.
Example 3
(1) Weighing 30 parts of fluororesin monomer, 45 parts of styrene monomer and 30 parts of hexamethylcyclotrisiloxane monomer, uniformly mixing, adding into a solution consisting of 6 parts of polyethylene glycol octyl phenyl ether, 6 parts of polyethylene glycol, 7 parts of polyethylene glycol stearate and 150 parts of water, weighing 7 parts of sericite powder, 3 parts of azodiisobutyronitrile and 2 parts of phenethyl alcohol oleate, uniformly mixing, adding into the solution, carrying out water bath constant temperature wet grinding until uniform mixing is achieved, and obtaining the modified fluororesin emulsion, wherein the water bath constant temperature is 50 ℃, the wet grinding time is 45min by using a planetary ball mill in a sealed state, the wet grinding balls are agate balls, and the diameter of the wet grinding balls is 2 mm.
(2) Weighing 140 parts of fly ash and 30 parts of water glass, mixing and stirring for 1min, then slowly adding 35 parts of water and 0.3 part of polycarboxylic acid water reducing agent, mixing and stirring for 4min until the mixture is uniform, and obtaining the water glass activated fly ash.
(3) Weighing 100 parts of the modified fluororesin emulsion obtained in the step (1), 120 parts of the water glass activated fly ash obtained in the step (2), 7 parts of triethylhexylphosphoric acid and 5 parts of polydimethylsiloxane, placing the beaker in a magnetic heating stirrer, and fully and uniformly mixing and stirring to obtain the high-performance anticorrosive composite coating, wherein the stirring temperature is 170 ℃ and the stirring time is 50 min.
Example 4
(1) Weighing 40 parts of fluororesin monomer, 35 parts of styrene monomer and 35 parts of hexamethylcyclotrisiloxane monomer, uniformly mixing, adding into a solution consisting of 7 parts of polyethylene glycol octyl phenyl ether, 5 parts of polyethylene glycol, 6 parts of polyethylene glycol stearate and 180 parts of water, weighing 8 parts of sericite powder, 3 parts of azodiisoheptonitrile and 2 parts of phenethyl alcohol oleate, uniformly mixing, adding into the solution, carrying out water bath constant temperature wet grinding until uniform mixing is achieved, and obtaining the modified fluororesin emulsion, wherein the water bath constant temperature is 50 ℃, wet grinding time is 50min by using a planetary ball mill in a sealed state, wet grinding balls are agate balls, and the diameter of the wet grinding balls is 2 mm.
(2) And weighing 120 parts of fly ash and 25 parts of water glass, mixing and stirring for 2min, slowly adding 35 parts of water and 0.4 part of HSB fat water reducing agent, mixing and stirring for 2min till mixing uniformly to obtain the water glass activated fly ash.
(3) And (2) weighing 120 parts of the modified fluororesin emulsion obtained in the step (1), 140 parts of the water glass activated fly ash obtained in the step (2), 7 parts of sodium dodecyl sulfate and 6 parts of melamine formaldehyde resin, placing the beaker in a magnetic heating stirrer, and fully mixing and stirring uniformly to obtain the high-performance anticorrosive composite coating, wherein the stirring temperature is 120 ℃ and the stirring time is 45 min.
Example 5
(1) Weighing 45 parts of fluororesin monomer, 40 parts of styrene monomer and 10 parts of hexamethylcyclotrisiloxane monomer, uniformly mixing, adding into a solution consisting of 8 parts of polyethylene glycol octyl phenyl ether, 6 parts of polyethylene glycol, 8 parts of polyethylene glycol stearate and 140 parts of water, weighing 10 parts of sericite powder, 4 parts of azodiisobutyronitrile and 3 parts of GPE defoaming agent, uniformly mixing, adding into the solution, carrying out water bath constant temperature wet grinding until uniform mixing is achieved, and obtaining the modified fluororesin emulsion, wherein the water bath constant temperature is 60 ℃, the wet grinding time is 40min by using a planetary ball mill in a sealed state, the wet grinding balls are ceramic balls, and the diameter of the wet grinding balls is 3 mm.
(2) Weighing 130 parts of fly ash and 30 parts of water glass, mixing and stirring for 3min, then slowly adding 30 parts of water and 0.5 part of polycarboxylic acid water reducing agent, mixing and stirring for 4min until the mixture is uniform, and obtaining the water glass activated fly ash.
(3) And (2) weighing 130 parts of the modified fluororesin emulsion obtained in the step (1), 150 parts of the water glass activated fly ash obtained in the step (2), 8 parts of methylpentanol and 7 parts of polydimethylsiloxane, placing the beaker into a magnetic heating stirrer, and fully mixing and stirring uniformly to obtain the high-performance anticorrosive composite coating, wherein the stirring temperature is 200 ℃ and the stirring time is 30 min.
Comparative example 1
(1) Weighing 40 parts of fluororesin monomer, 35 parts of styrene monomer and 25 parts of hexamethylcyclotrisiloxane monomer, and uniformly mixing to obtain unmodified fluororesin emulsion;
(2) weighing 100 parts of the unmodified fluororesin emulsion obtained in the step (1), 120 parts of fly ash, 7 parts of triethylhexyl phosphoric acid and 5 parts of polydimethylsiloxane, placing the beaker into a magnetic heating stirrer, and fully and uniformly mixing and stirring to obtain the composite coating, wherein the stirring temperature is 120 ℃ and the stirring time is 45 min.
Comparative example 2
(1) Weighing 40 parts of fluororesin monomer, 35 parts of styrene monomer and 25 parts of hexamethylcyclotrisiloxane monomer, uniformly mixing, adding into a solution consisting of 6 parts of polyethylene glycol octyl phenyl ether, 5 parts of polyethylene glycol, 6 parts of polyethylene glycol stearate and 100 parts of water, weighing 7 parts of sericite powder, 3 parts of azodiisoheptonitrile and 2 parts of phenethyl alcohol oleate, uniformly mixing, adding into the solution, carrying out water bath constant temperature wet grinding until uniform mixing is achieved, and obtaining the modified fluororesin emulsion, wherein the water bath constant temperature is 50 ℃, the wet grinding time is 8min by using a planetary ball mill in a sealed state, the wet grinding ball is an agate ball, and the diameter of the wet grinding ball is 2 mm.
(2) Weighing 100 parts of the modified fluororesin emulsion obtained in the step (1), 120 parts of fly ash, 7 parts of sodium dodecyl sulfate and 5 parts of melamine formaldehyde resin, placing the modified fluororesin emulsion, the fly ash, the sodium dodecyl sulfate and the melamine formaldehyde resin in a beaker, placing the beaker in a magnetic heating stirrer, and fully and uniformly mixing and stirring the materials to obtain the composite coating, wherein the stirring temperature is 120 ℃ and the stirring time is 45 min.
Comparative example 3
(1) Weighing 40 parts of fluororesin monomer, 35 parts of styrene monomer and 25 parts of hexamethylcyclotrisiloxane monomer, and uniformly mixing to obtain unmodified fluororesin emulsion;
(2) weighing 120 parts of fly ash and 25 parts of water glass, mixing and stirring for 1min, slowly adding 40 parts of water and 0.3 part of HSB fat water reducer, mixing and stirring for 3min until the mixture is uniformly mixed, and obtaining the water glass activated fly ash.
(3) Weighing 100 parts of the unmodified fluororesin emulsion obtained in the step (1), 120 parts of the water glass activated fly ash obtained in the step (2), 7 parts of methyl amyl alcohol and 5 parts of polydimethylsiloxane, placing the beaker into a magnetic heating stirrer, and fully mixing and stirring uniformly to obtain the high-performance anticorrosive composite coating, wherein the stirring temperature is 120 ℃, and the stirring time is 45 min.
Application examples
The method comprises the following steps:
(a) a sample plate of the coating is selected as a glass plate, the diameter of a required glass sheet is 50cm, before coating, cotton cloth stained with absolute ethyl alcohol and acetone is used for wiping dust and the like on the surface of the glass, and the surface is cleaned and dried for later use.
(b) The composite coatings prepared in examples 1 to 5 and comparative examples 1 to 3 were sequentially sprayed on the treated glass plates according to the thickness required by the national standard, and after being left for about 40min, the surfaces with the coatings were dried and then placed in a dryer for drying for 24h, and then various performance tests were performed on the coatings.
(c) The adhesion of the coating is measured according to the national standard GB/T1720-1979 using the circling test.
(d) The abrasion resistance of the coating is measured by testing the coating by a paint film abrasion instrument according to the national standard GB/T1768-1979 'determination method for abrasion resistance of paint film', and the degree of mass loss of the coating before and after abrasion represents the good and bad abrasion resistance of the coating.
(e) The testing is carried out according to the national standard ASTM D7334-2008 'coating contact angle measuring method', three testing points at different positions are selected on a sample plate coated with the composite coating in the testing process, and finally the average value of the tested data is obtained as the contact angle of the coating.
(f) Periodically testing the coating by using a salt spray corrosion box according to the national standard GB/T9798-1997 salt spray resistance test standard, marking an X line on a sample plate before testing to ensure that the coating can penetrate through, then performing edge covering treatment on the periphery of the sample plate, finally putting the coating sample plate into a 5% NaCl solution, and periodically observing the appearance of the coating sample plate, thereby measuring the salt spray resistance of the coating
(g) According to the national standard GB/T1766-1995 method for rating the ageing of paints and varnishes, panels coated with paint were placed in a 10% H2SO4 solution and the appearance of the paint was recorded every 24H until failure occurred. The acid resistance of the coating was thus measured;
(h) according to the national standard GB/T9266-1988, determination of alkali resistance of architectural coating, a sample coated with the coating is put into a 10% NaOH solution, and the appearance of the coating is recorded every 24 hours until damage occurs. Thus, the alkali resistance of the coating was measured;
(i) the flexibility of the coating was measured according to the national standard GB1731-1993 by testing the flexibility of the coating with a flexibility tester.
The test results of the coating samples obtained in examples 1 to 5 and comparative examples 1 to 3 are shown in table 1:
table 1 test results of coating samples of examples 1 to 5 and comparative examples 1 to 3
According to the above test results, it was shown that comparative example 1 is the mixing of an unmodified fluororesin emulsion with unmodified fly ash, comparative example 2 is the mixing of a modified fluororesin emulsion with unmodified fly ash, and comparative example 3 is the mixing of an unmodified fluororesin emulsion with water glass-activated fly ash. Compared with comparative examples 1 to 3, examples 1 to 5 are improved in acid and alkali resistance, salt spray resistance and the like, while examples 2 to 4 are the best in each property, when the modified fluororesin: when the modified fly ash is 0.75-0.86, the salt spray resistance of the modified fly ash can reach about 70 days, and the acid and alkali resistance of the modified fly ash can also reach about 50 days, so that the surface of the coating is damaged. Compared with common coatings, the high-performance anticorrosive composite coating provided by the invention has more excellent wear resistance, hydrophobicity and corrosion resistance. In addition, the coating has simple preparation process, low cost, low energy and environmental protection.
While the embodiments of the present invention have been described, the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (10)
1. A high-performance anticorrosive composite coating is characterized in that: the material comprises the following raw materials in parts by weight: 30-45 parts of fluororesin monomer, 30-45 parts of styrene monomer, 10-40 parts of hexamethylcyclotrisiloxane monomer, 4-8 parts of polyethylene glycol octyl phenyl ether, 4-6 parts of polyethylene glycol, 3-8 parts of polyethylene glycol stearate, 20-30 parts of water glass, 100-containing materials of 150 parts of fly ash, 2-4 parts of initiator, 100-containing materials of 200 parts of water, 1-3 parts of defoaming powder, 5-10 parts of sericite powder, 0.2-0.5 part of water reducing agent, 5-8 parts of dispersing agent and 3-7 parts of flatting agent, wherein the preparation method of the high-performance anticorrosive composite coating comprises the following steps:
(1) weighing a fluororesin monomer, a styrene monomer and a hexamethylcyclotrisiloxane monomer, uniformly mixing, adding into a solution consisting of polyethylene glycol octyl phenyl ether, polyethylene glycol stearate and water, weighing sericite powder, an initiator and a defoaming agent, uniformly mixing, adding into the solution, carrying out water bath at a constant temperature, and wet-grinding until uniformly mixing to obtain a modified fluororesin emulsion;
(2) weighing fly ash and water glass, mixing and stirring, slowly adding water and a water reducing agent, and uniformly mixing to obtain water glass activated fly ash;
(3) weighing 50-130 parts of the modified fluororesin emulsion obtained in the step (1), 70-150 parts of the water glass activated fly ash obtained in the step (2), 5-8 parts of a dispersing agent and 3-7 parts of a flatting agent, and uniformly mixing and stirring to obtain the high-performance anticorrosive composite coating; wherein the modified fluororesin emulsion: water glass activated fly ash = 0.75-0.86.
2. The high-performance anticorrosive composite coating according to claim 1, characterized in that: the fluororesin monomer is trifluorochloroethylene or tetrafluoroethylene.
3. The high-performance anticorrosive composite coating according to claim 1, characterized in that: the polyethylene glycol has a mass-average molecular weight of 400, 600 or 800.
4. The high-performance anticorrosive composite coating according to claim 1, characterized in that: the polyethylene glycol stearate is polyethylene glycol hydroxystearate or polyethylene glycol dilaurate or polyethylene glycol glyceryl stearate.
5. The high-performance anticorrosive composite coating according to claim 1, characterized in that: the initiator is azobisisobutyronitrile or azobisisoheptonitrile.
6. The high-performance anticorrosive composite coating according to claim 1, characterized in that: the defoaming agent is a high-alcohol defoaming agent or a polyether defoaming agent; the water reducing agent is a polycarboxylic acid high-performance water reducing agent or a fatty acid high-efficiency water reducing agent; the dispersing agent is triethyl hexyl phosphoric acid or sodium dodecyl sulfate or methyl amyl alcohol; the flatting agent is acrylic acid or organic silicon or fluorocarbon.
7. A method for preparing the high-performance anticorrosive composite coating according to any one of claims 1 to 6, characterized by comprising the following steps:
(1) weighing a fluororesin monomer, a styrene monomer and a hexamethylcyclotrisiloxane monomer, uniformly mixing, adding into a solution consisting of polyethylene glycol octyl phenyl ether, polyethylene glycol stearate and water, weighing sericite powder, an initiator and a defoaming agent, uniformly mixing, adding into the solution, carrying out water bath at a constant temperature, wet grinding until uniformly mixing to obtain a modified fluororesin emulsion;
(2) weighing fly ash and water glass, mixing and stirring, slowly adding water and a water reducing agent, and uniformly mixing to obtain water glass activated fly ash;
(3) and (3) weighing the modified fluororesin emulsion obtained in the step (1), the water glass activated fly ash obtained in the step (2), a dispersing agent and a flatting agent, and mixing and stirring uniformly to obtain the high-performance anticorrosive composite coating.
8. The preparation method of the high-performance anticorrosive composite coating according to claim 7, characterized in that: in the step (1), the constant temperature of the water bath is 40-60 ℃, wet grinding is carried out in a sealed state, the wet grinding time is 40-60min, the wet grinding balls are steel balls or ceramic balls or agate balls, and the diameter of the wet grinding balls is 1-3 mm.
9. The preparation method of the high-performance anticorrosive composite coating according to claim 7, characterized in that: in the step (2), the mixing time of the fly ash and the water glass is 1-3min, and the mixing time after the water and the water reducing agent are added is 2-4 min.
10. The preparation method of the high-performance anticorrosive composite coating according to claim 7, characterized in that: in the step (3), the mixing and stirring are magnetic heating and stirring, the stirring temperature is 100-200 ℃, and the stirring time is 30-60 min.
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