CN111892853B - Anticorrosive wear-resistant water-based filler, preparation method thereof and application thereof in coating - Google Patents

Anticorrosive wear-resistant water-based filler, preparation method thereof and application thereof in coating Download PDF

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CN111892853B
CN111892853B CN202010731413.2A CN202010731413A CN111892853B CN 111892853 B CN111892853 B CN 111892853B CN 202010731413 A CN202010731413 A CN 202010731413A CN 111892853 B CN111892853 B CN 111892853B
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filler
parts
coating
fly ash
resistant
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CN111892853A (en
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王池嘉
汪怀远
王子华
高晶
李珍
刘战剑
朱艳吉
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Northeast Petroleum University
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    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D161/00Coating compositions based on condensation polymers of aldehydes or ketones; Coating compositions based on derivatives of such polymers
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    • C09D5/00Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08Anti-corrosive paints
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    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/60Additives non-macromolecular
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Abstract

The invention relates to an anticorrosive wear-resistant water-based filler. The anticorrosive wear-resistant water-based filler comprises the following components in percentage by weight: porous solid waste pulverized coal ash 150-300 parts; 10-110 parts of flaky functional filler; 15-110 parts of rod-shaped functional filler; 10-50 parts of acetic acid; 10-20 parts of a chemical coupling agent; 1-5 parts of an adhesive. The preparation method of the anticorrosive wear-resistant water-based filler comprises the following steps: uniformly stirring porous solid waste fly ash, flaky functional filler, rodlike functional filler, deionized water, ethanol solvent, acetic acid, chemical coupling agent and adhesive in proportion, performing hydrothermal reaction at 50-300 ℃, filtering, washing, drying, grinding and grading to obtain the three-dimensional porous functional filler. According to the invention, the surface modification is combined with the nano-micro porous solid waste fly ash to pre-construct the filler with the three-dimensional net structure, the dispersibility of the filler in an aqueous solvent can be improved when the filler is added into the coating, meanwhile, the pre-crosslinking avoids the agglomeration phenomenon of the filler, and the corrosion resistance and the wear resistance of the composite coating are greatly improved.

Description

Anticorrosive wear-resistant water-based filler, preparation method thereof and application thereof in coating
Technical Field
The invention relates to the field of coatings, in particular to an anticorrosive wear-resistant water-based filler, a preparation method thereof and application thereof in coatings.
Background
Metal corrosion has become a significant problem worldwide, causing a great deal of economic loss and resource waste. Therefore, it is imperative to protect metals from corrosion. In recent years, researchers have proposed various methods of preventing corrosion of metals, such as improvements in metal substrates, use of corrosion inhibitors, application of cathodic protection, and surface coating techniques. Surface coating technology has been rapidly developed for metal corrosion protection, as the coating can create an effective physical barrier between the metal substrate and the corrosive environment. The organic coating has the advantages of simple construction, wide application and the like, and is distinguished in the surface coating protection technology. With the environmental protection concept, the content of Volatile Organic Compounds (VOC) is strictly controlled, and environmental protection coatings are widely concerned.
The water-based epoxy coating and the powder coating are two environmental-friendly coatings which attract people to pay attention at present, compared with the powder coating, the water-based epoxy coating has more flexible processing conditions, and the lower construction temperature is more beneficial to industrialization. The construction process of the powder coating is complex, the spraying condition has certain requirements on temperature, and the large-scale application is difficult to realize. In the preparation process of the water-based epoxy coating, obvious micropore defects are often shown after curing, and meanwhile, the water-based epoxy coating has poor adhesion to a metal substrate and is easy to generate foaming phenomenon. Although the water paint has some defects, the development of the water paint is still an irreversible trend along with the further increase of the environmental awareness of people.
In order to solve the defect problem of the water-based paint, an effective method is to utilize the performance of the filler to make up the defects of the water-based epoxy paint, the filler can improve the compactness of a coating, the operability of the coating and the like, and the invention efficiently improves the corrosion resistance and the wear resistance of the water-based paint.
A porous filler is selected, which is originally industrial waste, has stable physicochemical properties and a high specific surface area. The porous solid waste fly ash is used as a filler, so that the corrosion resistance and the wear resistance of the water-based paint can be effectively optimized. After simple crushing treatment and surface grafting modification treatment, a large number of functional groups are obtained on the surface of the composite filler, so that the dispersibility of the filler in a coating system can be effectively improved, and on the other hand, the functional groups provide possibility for the structural optimization among the composite fillers, and are favorable for synthesizing more stable composite fillers.
The sheet material and the rod material are often used as fillers in the coating field by virtue of the microstructures of the sheet material and the rod material, and a skeleton structure can be molded in the polymer coating by virtue of the special structures of the sheet material and the rod material. However, the problem of dispersion of the material of a particular structure in the coating is of critical importance. Therefore, the surface of the filler can be subjected to graft modification treatment, and the dispersibility of the filler in an epoxy resin system is further improved by virtue of the specific functional group on the graft, so that the performance of the composite coating is more stable.
The porous solid waste fly ash has the defects of poor granularity uniformity, complex surface groups, unstable components and the like, but has excellent mechanical properties, and can endow a water-based coating with certain wear resistance when being added into the coating. If the porous solid waste fly ash, the lamellar material and the rod-shaped material are subjected to functional modification treatment on the surfaces, and then the multidimensional multi-scale filler is subjected to three-dimensional structure pre-construction treatment, the interface effect and the compatibility of a water-based epoxy system can be effectively improved, the phenomenon that the filler is easy to agglomerate is avoided, various advantages of the nano-micron filler are comprehensively utilized, the functional groups are utilized to react with resin and a curing agent, organic and inorganic multi-scale multidimensional three-dimensional nano-micro structures are formed inside the coating after the coating is cured, and the reticular three-dimensional structure is further crosslinked with the resin, so that the composite filler has a more stable physical form, the specific surface structure is combined, and the corrosion resistance and the wear resistance of the composite coating are greatly improved.
Disclosure of Invention
The invention provides an anticorrosive wear-resistant water-based filler, aiming at overcoming the problems of insufficient dispersibility, corrosion resistance and wear resistance of the coating of the existing water-based anticorrosive paint in the background art. The anticorrosive wear-resistant water-based filler is prepared by combining surface modification with nano-micro porous solid waste fly ash to construct a three-dimensional mesh structure filler, and the filler is added into a coating to improve the dispersibility of the filler in a water-based solvent, and meanwhile, the pre-crosslinking avoids the agglomeration of the filler, so that the anticorrosive wear-resistant performance of the composite coating is greatly improved. The invention also provides a preparation method of the anticorrosive wear-resistant water-based filler and application of the anticorrosive wear-resistant water-based filler in paint.
The invention can solve the problems by the following technical scheme: the anticorrosive wear-resistant water-based filler comprises the following components in parts by weight: porous solid waste pulverized coal ash 150-300 parts; 10-110 parts of flaky functional filler; 15-110 parts of rod-shaped functional filler; 10-50 parts of acetic acid; 10-20 parts of a chemical coupling agent; 1-5 parts of an adhesive.
The adhesive is one or more of phenolic aldehyde-nitrile rubber, polyurethane rubber, silicon rubber and organic silica gel; the chemical coupling agent is one or a mixture of more of gamma-aminopropyl triethoxysilane, gamma-glycidoxypropyl trimethoxysilane, trichloroethyl silane, tetrabutyl titanate, triisostearoyl isopropyl titanate and tri-isopropyl titanate.
The flaky filler is one or a mixture of more of graphene, graphene oxide, molybdenum disulfide, hexagonal boron nitride and montmorillonite; the platy filler has an excellent lamellar structure and serves as a main shielding filler inside the polymer.
The rod-shaped filler is one or a mixture of more of carbon nano tube, carbon fiber, glass fiber and rod-shaped cerium dioxide; the rod-like filler has an excellent rod-like structure and serves as a main skeletal filler within the polymer.
The porous solid waste fly ash is one or a mixture of more of fly ash passing through a 100-mesh screen, fly ash passing through a 250-mesh screen, fly ash passing through a 350-mesh screen, fly ash passing through a 600-mesh screen, fly ash passing through an 800-mesh screen and fly ash passing through a 1000-mesh screen.
The invention also provides a preparation method of the various anticorrosive wear-resistant water-based functional fillers, which comprises the steps of uniformly stirring the porous solid waste fly ash, the flaky functional fillers, the rodlike functional fillers, the deionized water, the ethanol solvent, the acetic acid, the chemical coupling agent and the adhesive in proportion, carrying out hydrothermal reaction at 50-300 ℃, filtering, washing, drying, grinding and grading to obtain the three-dimensional porous functional fillers.
The invention also provides application of various anticorrosive wear-resistant water-based functional fillers in a coating, which comprises the following steps:
(1) dispersing the three-dimensional porous functional filler into deionized water to obtain filler dispersion liquid;
(2) and (2) dispersing epoxy resin, phenolic resin, aliphatic diamine and polyamide into deionized water according to a ratio, adding the filler dispersion liquid obtained in the step (1) into the mixed solution after stirring, continuously stirring, and performing ultrasonic dispersion to obtain the uniformly dispersed anticorrosive wear-resistant coating emulsion.
The principle of the corrosion-resistant wear-resistant water-based filler and the preparation thereof is as follows: the porous waste fly ash filler, the flaky filler and the rodlike filler are chemically modified by different chemical coupling agents and adhesives respectively. The surface of the functionalized porous fly ash filler is provided with a certain functional group, and the surfaces of the functionalized rod-shaped filler and the functionalized sheet-shaped filler are provided with another functional group. The three fillers are subjected to vacuum high-temperature drying treatment after being fully subjected to ultrasonic dispersion and mixing, and then are subjected to slight crushing and grading treatment to obtain the filler with the three-dimensional structure. The surface groups of the fillers with various shapes are different, and the fillers and the resin adhesive can mutually generate complex crosslinking reaction to construct the fillers with three-dimensional network structures.
According to the invention, a porous particle nano material with low cost and good wear resistance is selected as a main nano-micro filler, so that the defect of micropores generated in the synthetic process of the water-based composite coating is filled, and the basic wear resistance of the coating is improved. Meanwhile, a lamellar structure filler (such as graphene, montmorillonite, molybdenum disulfide and the like) and a filler with a one-dimensional rod-like structure (such as carbon nano tubes, carbon fibers, glass fibers and the like) are selected. The filler with the three-dimensional net structure is pre-constructed by combining surface modification with the nano-micro porous solid waste fly ash, and the filler is added into the coating to improve the dispersibility of the filler in an aqueous solvent, and the pre-crosslinking avoids the agglomeration phenomenon of the filler. The corrosion resistance and the wear resistance of the composite coating are greatly improved.
The filler modification mode is that a plurality of chemical coupling agents are adopted to respectively carry out purposeful graft modification on the fillers, surface functional groups can mutually generate cross-linking reaction after the fillers are modified and can mutually generate cross-linking reaction with epoxy resin and a curing agent, the dispersibility and the stability of the three fillers in coating resin are improved, and an organic-inorganic three-dimensional network structure with physical and chemical stability is formed. By combining the special structures and special appearances of the three fillers, the coating is endowed with excellent performances of high wear resistance, high corrosion resistance and high toughness, and the performances are mutually cooperated to obtain the efficient wear-resistant and wear-resistant water-based epoxy composite coating.
Compared with the background technology, the invention has the following beneficial effects:
the invention uses functional group coupling agent modification method to graft and modify a plurality of fillers of the coating respectively, and grafts a specific functional group in the interior or on the surface of the filler, for a certain porous solid waste fly ash, the surface functional group is complex but has low activity as an industrial waste, and the dispersibility in the solvent is very poor due to the non-uniform particle size. The addition of the functional group into the coating can cause the corrosion-resistant and wear-resistant effects of the coating to be very unstable, and after the modification by the coupling agent, the surface of the coating is grafted with a large number of functional groups, so that the dispersibility of the porous solid waste fly ash in a coating system is improved, and the possibility of mutual crosslinking among fillers is provided due to the existence of the functional groups. For part of sheet layer materials and rod-shaped materials, the composite material has an excellent surface structure, if the porous solid waste flyash is combined with the sheet layer materials and the rod-shaped materials, a synergistic effect is generated among functions of a plurality of fillers, the corrosion resistance and the wear resistance of a coating are greatly improved, but serious agglomeration phenomenon exists, so that the fillers are grafted and modified by using a functional group alkane coupling agent, a large number of functional groups are grafted on the surface of the excellent structural materials, a pre-crosslinking reaction is generated among the multi-dimensional, multi-scale and multi-shape fillers by using a unique pre-crosslinking process, a three-dimensional network-shaped structural filler is built, meanwhile, the functional groups on the surface of the three-dimensional filler can be crosslinked with each other and are crosslinked with epoxy resin and a curing agent, and finally, a complex organic-inorganic network structure is combined, so that the possibility is provided for preparing the long-life aqueous corrosion-resistant and wear-resistant coating.
The innovation point of the invention is that the surface of the coating filler is subjected to grafting modification treatment of functional groups which can mutually generate cross-linking reaction, the porous solid waste fly ash is subjected to mesh screening normalization treatment, the porous solid waste fly ash with different meshes is subjected to different functional group modification, meanwhile, flaky and rod-shaped materials with different structures are modified by different functional groups, and a plurality of complex fillers can mutually generate cross-linking reaction to form stable three-dimensional composite filler, so that the corrosion resistance and wear resistance of the coating are greatly improved. Moreover, in the coating system, the same crosslinking reaction exists between the epoxy system and the curing agent as between the three-dimensional filler, so that the corresponding crosslinking reaction also exists between the filler and the coating system, thereby preparing the composite coating with excellent corrosion resistance and wear resistance.
The treated porous solid waste fly ash is screened by a screen mesh with a plurality of mesh intervals, and a large number of functional groups are grafted on the surfaces of fly ashes with different mesh intervals, so that the filler can be uniformly dispersed on each part of the coating, each filler particle is an anti-corrosion unit in the coating, and a large number of functional group groups are grafted on the surface of the anti-corrosion unit, thereby providing favorable conditions for the subsequent preparation of the three-dimensional composite filler.
The lamellar material and the rod-shaped material are ground and then grafted and modified by the other material, so that a large number of functional groups are obtained on the surfaces of the lamellar material and the rod-shaped material, the agglomeration phenomenon of the particles in a coating is improved, and the functional groups exist on the surfaces of the lamellar material and the rod-shaped material, so that the lamellar material and the rod-shaped material can be subjected to crosslinking reaction with the porous solid waste fly ash filler to form the three-dimensional composite filler. The crosslinked composite filler not only can provide the traditional effect of the inorganic filler, but also can increase the corrosion resistance and the wear resistance of the coating.
If the unmodified filler is mixed into the coating solution, the dispersion performance is poor, and the corrosion and wear resistance of the coating can be hindered, the innovation of the invention is that one or more functional groups capable of reacting with each other are grafted on the surfaces of various fillers, the surface functional groups and a small amount of adhesive are utilized to pre-build the three-dimensional network filler through a vacuum process, and the unreacted functional groups are all beneficial to better dispersing the fillers in the coating solution, so that the aggregation phenomenon of the fillers is avoided as much as possible, the fillers are uniformly distributed in the coating, and the three-dimensional filler can also have a crosslinking reaction with epoxy resin and a curing agent of a coating system in the curing process of the coating, so that the corrosion and wear resistance of the coating is more excellent. The corrosion resistance can be improved by 10 times and the wear resistance can be improved by three times.
The anticorrosive wear-resistant coating provided by the invention has a simple preparation process, and can achieve the aim of recycling resources by adopting the main body filler as industrial waste. By adopting the water-based paint system, the prepared coating is very environment-friendly, the resource utilization rate is improved as much as possible, and the possibility of environmental pollution is reduced.
Drawings
FIG. 1 is a scanning electron micrograph of composite filler example two;
FIG. 2 is a graph of the effect of the coating without the filler after rubbing in example two;
FIG. 3 is a diagram showing the effect of the functional filler-added coating of example two after friction;
FIG. 4 is an EIS map of an unfilled coating of example two;
FIG. 5 is an EIS map of a composite coating of example two with added functional filler;
FIG. 6 is a schematic representation of the cross-linking reaction of example two composite fillers.
The specific implementation mode is as follows:
the following examples are given to illustrate the present invention in further detail, and it should be noted that the following examples are not to be construed as limiting the scope of the present invention, and that the insubstantial modifications and variations of the present invention as disclosed above may be made by those skilled in the art without departing from the scope of the present invention.
Example 1:
(1) metal surface pretreatment:
sequentially polishing the metal surface by using 240-mesh and 400-mesh sand paper, then putting the metal surface into an ethanol solution for ultrasonic cleaning, or treating the metal substrate by using high-pressure water jet with the water pressure of more than 20MPa to remove impurities such as dust, grease and the like on the surface of the metal substrate, wherein the concentration of the ethanol solution is 75%, taking out and naturally airing for later use.
(2) Preparing a functional composite filler:
mixing 150 parts of porous solid waste fly ash and 250 parts of purified water to form a suspension, ball-milling the suspension in a high-speed ball mill for 3 hours, and then screening the porous solid waste fly ash by using a 250-mesh screen to finally obtain finer porous solid waste fly ash particles. And then placing the fine porous solid waste fly ash particles into a muffle furnace to be calcined for 10 hours at a high temperature of 500 ℃, and sieving the sintered porous solid waste fly ash with a 100-mesh sieve and then with a 350-mesh sieve to obtain two calcined porous solid waste fly ashes with different particle sizes.
Dispersing 30 parts of fly ash sieved by a 100-mesh screen and 70 parts of fly ash sieved by a 350-mesh screen in 50 parts of ethanol solution to obtain a mixed solution, ultrasonically dispersing for 10min, adding 5 parts of acetic acid into 30 parts of purified water to prepare an acetic acid solution, dropwise adding the prepared acetic acid solution into the mixed solution, adjusting the pH value of the mixed solution to be about 3, dropwise adding 2 parts of gamma-glycidyl ether oxypropyltrimethoxysilane, 2 parts of gamma-glycidyl ether oxypropyl trimethoxysilane and 2 parts of triisostearoyl isopropyl titanate into the solution, reacting for 20h at normal temperature under the action of magnetic stirring, and filtering, washing and drying to obtain the functionalized porous fly ash filler.
Respectively dispersing 10 parts of molybdenum disulfide, 10 parts of graphene, 20 parts of montmorillonite or 30 parts of rod-shaped cerium dioxide and 10 parts of carbon fiber into 100 parts of ethanol solution, performing ultrasonic dispersion for 10min to obtain a mixed solution, adding 20 parts of acetic acid into 10 parts of purified water to prepare an acetic acid solution, dropwise adding the acetic acid solution into the mixed solution, adjusting the pH value of the solution to be about 3, dropwise adding 2 parts of gamma-aminopropyltriethoxysilane and 6 parts of trichloroethylsilane into the solution, reacting at normal temperature for 10h under the action of magnetic stirring, and then filtering, washing and drying to obtain the functionalized layered filler or functionalized rod-shaped material.
And (2) dispersing 20 parts of the prepared functionalized porous solid waste fly ash, 9 parts of functionalized rod-shaped material, 3 parts of functionalized sheet material and 1 part of phenolic-butyronitrile rubber into a mixed solution of 10 parts of ethyl acetate and 10 parts of ethanol, adding the mixture after ultrasonic dispersion, pre-drying, putting the dispersion into a vacuum drying oven to perform drying reaction for 8 hours at the temperature of 60 ℃ after the dispersion is in a stable viscous state, and thus obtaining the pre-built three-dimensional network-shaped filler. Grinding by using a mortar, and sieving by using a 200-mesh sieve to obtain the three-dimensional network filler.
(3) Preparing a functional composite coating:
dispersing the 32 parts of the three-dimensional network filler into 100 parts of deionized water, and performing ultrasonic dispersion for 30min to obtain a filler dispersion liquid; dispersing 100 parts of epoxy resin, 200 parts of phenolic resin, 200 parts of aliphatic diamine and 200 parts of polyamide into 50 parts of deionized water, magnetically stirring for 20min, adding the filler dispersion into the mixed solution, continuously stirring for 180min, and ultrasonically dispersing for 3min to obtain the uniformly dispersed anticorrosive wear-resistant coating emulsion. And then the prepared coating emulsion is uniformly sprayed on the surface of the metal substrate by an air pump spraying or high-pressure spraying method.
(3) And (3) coating curing process: and (3) placing the sprayed metal base material in the air, curing for 4h at room temperature, then curing for 2h at 80 ℃, and finally curing for 1h at 120 ℃ to obtain the cured anticorrosive wear-resistant coating.
(4) Measurement of Performance
Corrosion resistance: the prepared composite coating is placed in an environment containing 3.5% NaCl solution, a three-electrode system is adopted, a saturated calomel electrode is included, a platinum electrode and a coating area exposed in the 3.5% NaCl solution are respectively used as reference electrodes, and a counter electrode and a working electrode are used for carrying out 20 mV sine disturbance electrochemical impedance spectrum analysis on samples with different immersion time within the frequency range of 100 kHz to 0.01 Hz. The obtained electrochemical measurement data are subjected to fitting analysis by Zview software, and the result shows that the module value of the Baud model of the coating added with the composite filler is improved by ten times compared with that before the coating is added, the Nyquist diagram of the coating is closer to an ideal semicircular arc shape, and the corrosion resistance of the coating is obviously improved.
Wear resistance: and after the prepared composite coating is cured, standing for 1 day at room temperature, and performing a friction test on the composite coating on a Taber abrasion tester, wherein the rotating speed of a grinding wheel is 2500r/h, the duration of the friction test is 5min, and the normal load is 3N. The wear amount of the coating is reflected by measuring the thickness difference of the coating before and after the coating by using a coating thickness gauge, the roughness of the microscopic surface of the coating after friction is observed by using a scanning electron microscope, after the composite filler is added into a coating system, the loss amount of the coating before and after the coating is worn is reduced from 0.3g to 0.002g, the wear degree of the coating is visually and greatly reduced, the friction surface becomes smoother in a scanning electron microscope picture, no more gullies are generated, and the wear resistance of the coating is greatly improved.
Example 2:
(1) metal surface pretreatment:
sequentially polishing the metal surface by 600-mesh and 800-mesh sand paper, then putting the metal surface into an ethanol solution for ultrasonic cleaning, or treating the metal substrate by using high-pressure water jet with the water pressure of more than 20MPa to remove impurities such as dust, grease and the like on the surface of the metal substrate, wherein the concentration of the ethanol solution is 80%, taking out and naturally airing for later use.
(2) Preparing a functional composite filler:
mixing 200 parts of porous solid waste fly ash and 400 parts of purified water to form a suspension, ball-milling the suspension in a high-speed ball mill for 8 hours, and then screening the porous solid waste fly ash by using a 250-mesh screen and a 600-mesh screen to finally obtain fine porous solid waste fly ash particles. And then placing the fine porous solid waste fly ash into a muffle furnace to be calcined for 28 hours at the high temperature of 900 ℃, and screening the sintered porous solid waste fly ash through a 800-mesh screen to obtain the calcined porous solid waste fly ash.
Dispersing 50 parts of fly ash sieved by a 250-mesh screen and 50 parts of fly ash sieved by a 600-mesh screen in 100 parts of ethanol solution with certain concentration, ultrasonically dispersing for 35min, adding 10 parts of acetic acid into 5 parts of purified water to prepare an acetic acid solution, dropwise adding the acetic acid solution into the porous solid waste fly ash mixed solution, adjusting the pH value of the solution to be about 4, dropwise adding 2 parts of isopropyl trititanate, 2 parts of tetrabutyl titanate and 2 parts of gamma-aminopropyltriethoxysilane into the solution, reacting for 5 hours at normal temperature under the action of magnetic stirring, and then filtering, washing and drying to obtain the functionalized porous fly ash filler.
Respectively dispersing 10 parts of carbon nano tube, 10 parts of glass fiber, 20 parts of carbon fiber or 20 parts of graphene oxide and 20 parts of hexagonal boron nitride into 200 parts of ethanol solution, after ultrasonic dispersion for 25min, adding 10 parts of acetic acid into 5 parts of purified water to prepare acetic acid solution, dropwise adding the acetic acid solution into the mixed solution, adjusting the pH value of the solution to be about 4, dropwise adding 6 parts of gamma-glycidyl ether oxypropyltrimethoxysilane and 2 parts of tetrabutyl titanate into the solution, reacting at normal temperature for 28h under the action of magnetic stirring, and then filtering, washing and drying to obtain the functionalized rod-shaped filler or functionalized lamellar filler.
Dispersing 10 parts of functionalized porous solid waste fly ash, 3 parts of functionalized rod-shaped material, 6 parts of functionalized sheet material and 3 parts of polyurethane rubber into a mixed solution of 10 parts of ethyl acetate and 10 parts of ethanol, adding the mixture after ultrasonic dispersion, pre-drying, putting the dispersion into a vacuum drying oven to perform drying reaction for 5 hours at 70 ℃ after the dispersion is in a stable viscous state, and obtaining the pre-built three-dimensional network filler. Grinding by using a mortar, and sieving by using a 200-mesh sieve to obtain the three-dimensional network filler.
(3) Preparing a functional composite coating:
dispersing the 22 parts of the three-dimensional network filler into 200 parts of deionized water, and performing ultrasonic dispersion for 10min to obtain a filler dispersion liquid; dispersing 150 parts of polyurethane resin, 150 parts of phenolic resin, 200 parts of aliphatic polyamine and 100 parts of polyamide into 50 parts of deionized water, magnetically stirring for 5min, adding the filler dispersion into the mixed solution, continuously stirring for 40min, and ultrasonically dispersing for 15min to obtain the uniformly dispersed anticorrosive wear-resistant coating emulsion. After the three-dimensional composite filler is analyzed by a scanning electron microscope, as shown in fig. 1, the fillers show cross-linked morphology characteristics, and when the sizes of the fly ash particles are different, different cross-linking modes are shown, so that a honeycomb-shaped three-dimensional structure and a chain-shaped three-dimensional structure are formed in the coating. And then the prepared coating emulsion is uniformly sprayed on the surface of the metal substrate by an air pump spraying or high-pressure spraying method.
(3) And (3) coating curing process: and (3) placing the sprayed metal base material in the air, curing for 10h at room temperature, then curing for 6h at 80 ℃, and finally curing for 24h at 120 ℃ to obtain the cured anticorrosive wear-resistant coating.
(4) Measurement of Performance
Corrosion resistance: the prepared composite coating is placed in an environment containing 3.5% NaCl solution, a three-electrode system is adopted, a saturated calomel electrode is included, a platinum electrode and a coating area exposed in the 3.5% NaCl solution are respectively used as reference electrodes, and a counter electrode and a working electrode are used for carrying out 20 mV sine disturbance electrochemical impedance spectrum analysis on samples with different immersion time within the frequency range of 100 kHz to 0.01 Hz. The obtained electrochemical measurement data are subjected to fitting analysis by Zview software, and the results show that the polymer coating without the filler enters the middle soaking period after being soaked for three days (figure 4), and the process is prolonged to 20 days after the composite filler is added, and besides, the impedance modulus of the polymer material reaches 107On the left and right (fig. 5), the above phenomena illustrate that the composite filler makes a great contribution to the corrosion resistance of the coating.
Wear resistance: and after the prepared composite coating is cured, standing for 14 days at room temperature, and performing a friction test on the composite coating on a Taber abrasion tester, wherein the rotating speed of a grinding wheel is 3000r/h, the duration of the friction test is 50min, and the normal load is 5N. The wear amount of the coating is reflected by measuring the thickness difference before and after the coating by using a coating thickness gauge, the roughness of the microscopic surface of the coating after friction is observed by using a scanning electron microscope, the coating thickness gauge shows that after the filler is added, the frictional thickness difference is reduced from the original 80um to about 25um, the wear resistance is improved by about three times, and the scanning electron microscope shows that the polymer coating without the filler shows serious wear traces and has obvious phenomena of gully and hollow unevenness (figure 2), after the composite filler is added, the microscopic surface of the coating becomes very smooth and only has a small amount of microscopic traces, and the result shows that the wear resistance of the coating is greatly improved. After the three-dimensional reticular filler is added into the polymer coating, the interior of the polymer coating becomes opaque and the abrasion effect of the polymer coating is obviously improved. After the polymer coating is subjected to a friction test by a Taber abrasion tester, the quality difference before and after the test is greatly reduced, the surface of the coating only shows a slight abrasion trace, no obvious white serious abrasion area exists at the edge of the abrasion trace, and no abrasion accumulation is generated. Under the observation of a scanning electron microscope, no obvious groove or larger abrasion track is generated in the abrasion area of the polymer coating, a smooth friction surface is shown, only slight abrasion traces exist, and after a specific area is enlarged, the friction surface can be seen to be quite flat and no black hole is generated, so that the excellent compatibility is realized between the three-dimensional reticular filler and the polymer system, and the rigidity and the flexibility of the polymer material can be increased by the three-dimensional reticular filler, so that the abrasion resistance of the composite coating is improved.
Example 3:
(1) metal surface pretreatment:
sequentially polishing the metal surface by 600-mesh and 1000-mesh sand paper, then putting the metal surface into an ethanol solution for ultrasonic cleaning, or treating the metal substrate by using high-pressure water jet with the water pressure of more than 20MPa to remove impurities such as dust, grease and the like on the surface of the metal substrate, wherein the concentration of the ethanol solution is 95%, taking out and naturally airing for later use.
(2) Preparing a functional composite filler:
mixing 200 parts of porous solid waste fly ash and 100 parts of purified water to form a suspension, ball-milling the suspension in a high-speed ball mill for 17 hours, and then screening the porous solid waste fly ash with different particle sizes by using a 350-mesh screen and a 800-mesh screen to finally obtain fine porous solid waste fly ash particles. And then placing the fine porous solid waste fly ash into a muffle furnace to be calcined for 48 hours at the high temperature of 1300 ℃, and sieving the sintered porous solid waste fly ash by a 1000-mesh sieve to obtain the calcined porous particle filler.
Dispersing 40 parts of fly ash sieved by a 350-mesh screen and 10 parts of fly ash sieved by an 800-mesh screen in 200 parts of ethanol solution, ultrasonically dispersing for 80min, adding 5 parts of acetic acid into 30 parts of purified water to prepare an acetic acid solution, dropwise adding the acetic acid solution into the mixed solution, adjusting the pH value of the solution to be about 2, dropwise adding 2 parts of triisostearoyl isopropyl titanate and 3 parts of triiso-isopropyl titanate into the solution, reacting for 11h at normal temperature under the action of magnetic stirring, and filtering, washing and drying to obtain the functionalized porous fly ash filler.
Respectively dispersing 10 parts of graphene, 10 parts of graphene oxide, 30 parts of hexagonal boron nitride or 25 parts of rod-shaped cerium dioxide and 25 parts of glass fiber into 100 parts of ethanol solution, ultrasonically dispersing for 10min, adding 5 parts of acetic acid into 30 parts of purified water to prepare an acetic acid solution, dropwise adding the acetic acid solution into the mixed solution, adjusting the pH value of the solution to be about 2, dropwise adding 5 parts of trichloroethylsilane into the solution, reacting at normal temperature for 6 hours under the action of magnetic stirring, and then filtering, washing and drying to obtain the functionalized lamellar material or the functionalized rod-shaped material.
Dispersing 10 parts of functionalized porous particles, 5 parts of functionalized rod-shaped filler, 5 parts of functionalized sheet material and 2 parts of silicone rubber into a mixed solution of 10 parts of ethyl acetate and 10 parts of ethanol, adding the mixture after ultrasonic dispersion, pre-drying, putting the dispersion into a vacuum drying oven to perform drying reaction for 2 hours at 120 ℃ after the dispersion is in a stable viscous state, and obtaining the pre-built three-dimensional network-shaped filler. Grinding by using a mortar, and sieving by using a 200-mesh sieve to obtain the three-dimensional network filler.
(3) Preparing a functional composite coating:
dispersing the 22 parts of the three-dimensional network filler into 50 parts of deionized water, and performing ultrasonic dispersion for 20min to obtain a filler dispersion liquid; dispersing 500 parts of epoxy resin 100 parts, 150 parts of aliphatic polyamine and 50 parts of aromatic amine into 50 parts of deionized water, magnetically stirring for 5min, adding the filler dispersion into the mixed solution, continuously stirring for 3min, and ultrasonically dispersing for 5min to obtain the uniformly dispersed anticorrosive wear-resistant coating emulsion. And then the prepared coating emulsion is uniformly sprayed on the surface of the metal substrate by an air pump spraying or high-pressure spraying method.
(3) And (3) coating curing process: and (3) placing the sprayed metal base material in the air, and curing for 10 hours at room temperature to obtain the cured anticorrosive wear-resistant coating.
(4) Measurement of Performance
Corrosion resistance: the prepared composite coating is placed in an environment containing 3.5% NaCl solution, a three-electrode system is adopted, a saturated calomel electrode is included, a platinum electrode and a coating area exposed in the 3.5% NaCl solution are respectively used as reference electrodes, and a counter electrode and a working electrode are used for carrying out 20 mV sine disturbance electrochemical impedance spectrum analysis on samples with different immersion time within the frequency range of 100 kHz to 0.01 Hz. The obtained electrochemical measurement data are subjected to fitting analysis by Zview software, and the result shows that the soaking time of the coating is improved to 40 days from 3 days, the coating after the composite filler is added has higher resistance modulus all the time, the Nyquist diagram shows a second time constant only after about 35 days, and the corrosion resistance is improved by about ten times compared with that of a pure polymer coating.
Wear resistance: and after the prepared composite coating is cured, standing for 3 days at room temperature, and performing a friction test on the composite coating on a Taber abrasion tester, wherein the rotating speed of a grinding wheel is 2000r/h, the duration of the friction test is 100min, and the normal load is 2N. The wear loss of the coating is reflected by the thickness difference of the coating before and after the coating is measured by a coating thickness gauge, the roughness of the microscopic surface of the coating after friction is observed by a scanning electron microscope, the result shows that after the coating is added with the composite filler, the wear trace of the coating is visually observed to be controlled, the loss of the coating thickness is reduced to 32un from 60um, the wear degree of the coating after the filler is added is shown to be smaller by the scanning electron microscope, and the wear resistance of the coating is effectively improved.
Example 4:
(1) metal surface pretreatment:
sequentially polishing the metal surface by 1000-mesh and 2000-mesh sand paper, then putting the metal surface into an ethanol solution for ultrasonic cleaning, or treating the metal substrate by using high-pressure water jet with the water pressure of more than 20MPa to remove impurities such as dust, grease and the like on the surface of the metal substrate, wherein the concentration of the ethanol solution is 80%, taking out and naturally airing for later use.
(2) Preparing a functional composite filler:
mixing 300 parts of porous solid waste fly ash and 400 parts of purified water to form a suspension, ball-milling the suspension in a high-speed ball mill for 14h, and then screening the porous solid waste fly ash with different particle sizes by using a 600-mesh screen and a 1000-mesh screen to finally obtain fine porous solid waste fly ash particles. And then placing the fine porous solid waste fly ash into a muffle furnace to be calcined for 72 hours at the high temperature of 1000 ℃, and sieving the sintered porous solid waste fly ash by a 600-mesh sieve to obtain the calcined porous fly ash filler.
Dispersing 80 parts of fly ash sieved by a 600-mesh screen and 120 parts of fly ash sieved by a 1000-mesh screen in 200 parts of ethanol solution, ultrasonically dispersing for 20min, adding 20 parts of acetic acid into 10 parts of purified water to prepare an acetic acid solution, dropwise adding the acetic acid solution into the mixed solution, adjusting the pH value of the solution to be about 4, dropwise adding 5 parts of gamma-glycidyl ether oxypropyltrimethoxysilane into the solution, reacting for 3h at normal temperature under the action of magnetic stirring, and filtering, washing and drying to obtain the functionalized porous fly ash filler.
Respectively dispersing 30 parts of molybdenum disulfide, 30 parts of montmorillonite, 30 parts of hexagonal boron nitride, 10 parts of graphene or 50 parts of rod-shaped cerium dioxide and 150 parts of carbon nano tube into 200 parts of ethanol solution, ultrasonically dispersing for 30min, adding 20 parts of acetic acid into 10 parts of purified water to prepare an acetic acid solution, dropwise adding the acetic acid solution into the mixed solution, adjusting the pH value of the solution to be about 4, dropwise adding 5 parts of triisostearoyl isopropyl titanate into the solution, reacting at normal temperature for 20h under the action of magnetic stirring, and then filtering, washing and drying to obtain the functionalized lamellar filler or the functionalized rod-shaped material.
Dispersing 5 parts of functionalized porous solid waste fly ash, 10 parts of functionalized rod-shaped material, 10 parts of functionalized sheet material and 5 parts of organic silica gel into a mixed solution of 10 parts of ethyl acetate and 10 parts of ethanol, adding the mixture after ultrasonic dispersion, pre-drying, putting the dispersion into a vacuum drying oven to perform drying reaction for 12 hours at the temperature of 60 ℃ after the dispersion is in a stable viscous state, and obtaining the pre-built three-dimensional network-shaped filler. Grinding by using a mortar, and sieving by using a 200-mesh sieve to obtain the three-dimensional network filler.
(3) Preparing a functional composite coating:
dispersing the 30 parts of the three-dimensional network filler into 200 parts of deionized water, and performing ultrasonic dispersion for 10min to obtain a filler dispersion liquid; dispersing 150 parts of epoxy resin and 300 parts of aliphatic polyamine into 200 parts of deionized water, magnetically stirring for 20min, adding the filler dispersion into the mixed solution, continuously stirring for 5min, and ultrasonically dispersing for 10min to obtain the uniformly dispersed anticorrosive wear-resistant coating emulsion. And then the prepared coating emulsion is uniformly sprayed on the surface of the metal substrate by an air pump spraying or high-pressure spraying method.
(3) And (3) coating curing process: and (3) placing the sprayed metal substrate in the air, and then curing for 24 hours at 70 ℃ to obtain the cured anticorrosion wear-resistant coating.
(4) Measurement of Performance
Corrosion resistance: the prepared composite coating is placed in an environment containing 3.5% NaCl solution, a three-electrode system is adopted, a saturated calomel electrode is included, a platinum electrode and a coating area exposed in the 3.5% NaCl solution are respectively used as reference electrodes, and a counter electrode and a working electrode are used for carrying out 20 mV sine disturbance electrochemical impedance spectrum analysis on samples with different immersion time within the frequency range of 100 kHz to 0.01 Hz. The results show that the impedance modulus of the polymer baud mode is from 10 when the composite filler is added6Is lifted to 108And the coating enters the soaking middle stage after about 30 days, the obtained electrochemical measurement data is subjected to fitting analysis by Zview software, and the fitting data of the coating after the filler is added is closer to an RQR fitting circuit.
Wear resistance: and after the prepared composite coating is cured, standing for 20 days at room temperature, and performing a friction test on the composite coating on a Taber abrasion tester, wherein the rotating speed of a grinding wheel is 1000r/h, the duration of the friction test is 30min, and the normal load is 4N. The coating thickness gauge is adopted to measure the wear loss of the coating by the thickness difference between the front and the back of the coating, and the roughness of the microscopic surface of the coating after friction is observed through a scanning electron microscope, so that the result shows that the wear degree of the coating without the filler is more serious, obvious wear products are accumulated, the wear surface of the coating with the composite filler is smoother, and the front and the back wear thickness difference is reduced to 40um from 70 um. The wear resistance of the coating is good.
The individual component drugs used in the above examples are all commercially available.

Claims (10)

1. The corrosion-resistant wear-resistant water-based filler is characterized in that: the components and the proportion are as follows according to parts by weight: porous solid waste pulverized coal ash 150-300 parts; 10-110 parts of flaky functional filler; 15-110 parts of rod-shaped functional filler; 10-50 parts of acetic acid; 10-20 parts of a chemical coupling agent; 1-5 parts of an adhesive;
the preparation method comprises mixing porous solid waste fly ash, flaky functional filler and rodlike functional filler with acetic acid aqueous solution and chemical coupling agent respectively, and modifying to obtain functional porous solid waste fly ash, functional rodlike material and functional lamellar material; and then dispersing the functionalized porous solid waste fly ash, the functionalized rod-shaped material and the functionalized lamellar material into the adhesive and the mixed solution of ethyl acetate and ethanol in proportion, and obtaining the three-dimensional porous functional filler after ultrasonic dispersion, drying, grinding and grading.
2. The corrosion-resistant wear-resistant aqueous filler according to claim 1, wherein: the flaky functional filler is one or a mixture of more of graphene, graphene oxide, molybdenum disulfide, hexagonal boron nitride and montmorillonite.
3. The corrosion-resistant wear-resistant aqueous filler according to claim 1, wherein: the rod-shaped functional filler is one or a mixture of more of carbon nano tubes, carbon fibers, glass fibers and rod-shaped cerium dioxide.
4. The corrosion-resistant wear-resistant aqueous filler according to claim 1, wherein: the adhesive is one or more of phenolic-nitrile rubber, polyurethane rubber and organic silica gel; the chemical coupling agent is one or a mixture of more of gamma-aminopropyl triethoxysilane, gamma-glycidoxypropyl trimethoxysilane, trichloroethyl silane, tetrabutyl titanate, triisostearoyl isopropyl titanate and tri-isopropyl titanate.
5. The corrosion-resistant wear-resistant aqueous filler according to claim 1, wherein: the porous solid waste fly ash is one or a mixture of more of fly ash passing through a 100-mesh screen, fly ash passing through a 250-mesh screen, fly ash passing through a 350-mesh screen, fly ash passing through a 600-mesh screen, fly ash passing through an 800-mesh screen and fly ash passing through a 1000-mesh screen.
6. A method for preparing the corrosion-resistant wear-resistant water-based filler according to claim 1, which is characterized in that: respectively mixing and modifying porous solid waste fly ash, flaky functional filler and rodlike functional filler with an acetic acid aqueous solution and a chemical coupling agent to obtain functionalized porous solid waste fly ash, a functionalized rodlike material and a functionalized lamellar material; and then dispersing the functionalized porous solid waste fly ash, the functionalized rod-shaped material and the functionalized lamellar material into the adhesive and the mixed solution of ethyl acetate and ethanol in proportion, and obtaining the three-dimensional porous functional filler after ultrasonic dispersion, drying, grinding and grading.
7. The use of the corrosion and wear resistant aqueous filler according to claim 1 in a coating, wherein: the anticorrosive wear-resistant water-based functional filler is used for preparing a coating, and the coating comprises the following components in parts by weight: the resin, the three-dimensional porous functional filler and the curing agent are 60-500: 12-100: 30-200.
8. The use of the corrosion and wear resistant water-based filler in a coating according to claim 7, wherein: the process for preparing the coating by using the anticorrosive wear-resistant water-based functional filler comprises the following steps:
(1) dispersing the three-dimensional porous functional filler into deionized water or an ethanol solution to obtain a filler dispersion liquid;
(2) and (2) dispersing the resin and the curing agent into deionized water according to a certain proportion, adding the filler dispersion liquid obtained in the step (1) into the mixed solution after stirring, continuously stirring, and performing ultrasonic dispersion to obtain the uniformly dispersed anticorrosive wear-resistant coating emulsion.
9. The use of the corrosion and wear resistant water-based filler in a coating according to claim 7, wherein: the resin is one of water-based epoxy resin, phenolic resin and polyurethane resin; the curing agent is one or a mixture of aliphatic diamine, aliphatic polyamine, aromatic amine, polyamide and acid anhydride.
10. The use of the corrosion and wear resistant aqueous filler according to claim 8 in a coating, wherein: the weight part ratio of the three-dimensional porous functional filler in the step (1) to deionized water is 10-30: 100, respectively; the polymer resin, the curing agent and the deionized water in the step (2) have the weight part ratio of 50-80: 10-20: 50.
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