CN113321994A - Preparation method of high-strength erosion-resistant polyurea composite coating - Google Patents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/02—Polyureas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
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Abstract
The invention discloses a preparation method of a polyurea composite coating with high strength and erosion resistance, which comprises the steps of firstly preparing BNNSs, a polyurea A component and a polyurea B component respectively, then mixing BNNSs into the B component to be uniformly dispersed to prepare a mixture, and then spraying the A component and the mixture on the surface of a metal substrate through spraying equipment to obtain a composite coating after solidification; the BNNSs inherits the good thermal property and excellent lubricating property of h-BN, and has high strength, high temperature resistance, insulation and chemical stability, so that the composite coating has a wider application range. The strength of the polyurea composite coating is improved by introducing BNNSs, when the composite coating is impacted by external force, impact energy can be consumed by boron nitride particles, so that the impact resistance of the coating is enhanced, and when the composite coating is eroded by external force, the laminated BNNSs in the polyurea coating system can be used as a reinforcement body to bear part of load and can be used as a lubricant to play a role in reducing erosion.
Description
Technical Field
The invention relates to a polyurea composite coating, in particular to a preparation method of a polyurea composite coating with high strength and erosion resistance.
Background
Erosive wear refers to wear caused by fluid or fluid jets with abrasive solid particles impacting the surface of a material at a certain velocity and angle. In recent years, the problem of material failure caused by erosion and abrasion is increasing, and the problem becomes an economic problem which is emphasized by various countries. How to effectively protect the metal is a continuous pursuit of scientific research workers, and the preparation process for coating the anti-erosion abrasion coating on the metal surface is simple, low in cost and free from the limitation of regional conditions, so that the anti-erosion abrasion coating becomes the simplest, rapid and effective anti-erosion means. Polyurea erosion wear resistant coatings are one of the most commonly used coatings.
The polyurea is formed by spraying raw materials such as semi-prepolymer, amine-terminated polyether, amine chain extender and the like on site. The polyurea coating has the following characteristics: (1) the coating can be quickly cured without a catalyst during reaction, can be gelled when being constructed for several seconds, can be sprayed and molded on any curved surface, inclined surface and vertical surface, and does not generate a sagging phenomenon; (2) the coating has the solid content of 100 percent, has no harmful substance emission in the coating forming process, is environment-friendly, can be sprayed and poured according to a determined volume ratio, can meet the thickness requirement by one-time construction, and overcomes the defect of repeated construction of the traditional coating; (3) the coating has excellent physical properties such as tensile strength, flexibility, wear resistance and the like; (4) the coating has good thermal stability, can be used for a long time at 150 ℃ and can bear short-time thermal impact at 350 ℃.
The requirement of the complex and variable application environment on the erosion resistance of the coating is higher and higher, the single and traditional hard erosion-resistant coating is not enough to meet the current requirement of people on the erosion-resistant wear coating, and the hard coating has the problems of complex preparation process, high cost and the like. Based on the above problems, how to provide a composite coating, which not only has higher strength, but also has better erosion resistance, thereby effectively prolonging the service life of the coated part, is the research direction of the industry.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a preparation method of a polyurea composite coating with high strength and erosion resistance, and the prepared composite coating not only has higher mechanical strength, but also has better erosion resistance, thereby effectively prolonging the service life of a coated part.
In order to achieve the purpose, the invention adopts the technical scheme that: a preparation method of a polyurea composite coating with high strength and erosion resistance comprises the following specific steps:
step 1: pretreatment of the metal substrate: polishing a metal base material by using 800-1200-mesh abrasive paper until the surface is smooth, then putting the polished metal base material into a mixed solution of ethanol and acetone, ultrasonically cleaning the metal base material for 1-2 hours by using ultrasonic equipment under the power of 70-80 w, and drying the metal base material in an oven at the temperature of 70-80 ℃ for 1-2 hours for later use after cleaning;
step 2: preparation of BNNSs: adding 5-10 parts by mass of sugar and 1-5 parts by mass of h-BN (namely hexagonal boron nitride) into deionized water to form a mixed solution, performing ultrasonic treatment on the mixed solution by using ultrasonic equipment under the power of 50-60 w, stirring for 20-30 min at the speed of 100-150 r/min to uniformly disperse the mixed solution, transferring the mixed solution into a ball milling tank to perform ball milling for 24-48 h under the condition that the rotating speed is 500r/min, putting the mixed solution into a centrifuge to perform centrifugal washing for 10min under the condition that the rotating speed is 8000-10000 r/min, and finally performing freeze drying on the centrifuged mixed solution for 24h to obtain BNNSs (namely boron nitride nanosheets); wherein the mass ratio of the h-BN to the deionized water is 1: 5;
and step 3: preparation of polyurea A component: dehydrating 30-50 parts by mass of polyester polyol at 100-120 ℃ for 2-4 h, adding 40-60 parts by mass of diisocyanate, placing the mixture in an atmosphere furnace with protective gas, heating to 70-80 ℃ at a heating rate of 3-5 ℃, preserving heat for 3-5 h, cooling along with the furnace, and taking out to obtain a polyurea component A;
and 4, step 4: preparation of polyurea B component: adding 20-60 parts by mass of amino-terminated polyether and 40-60 parts by mass of amine chain extender into a reaction kettle, stirring at the speed of 50-100 r/min for 10-30 min to uniformly mix, then heating the reaction kettle to 100-120 ℃ for reaction for 3h, after the reaction is finished, injecting protective gas, opening cooling water to cool to 60-70 ℃, and taking out the cooled polyurea component B to obtain the polyurea component B;
and 5: preparing a polyurea composite coating: mixing 3-10 parts by mass of BNNSs into 30-40 parts by mass of component B, uniformly dispersing to obtain a mixture, adding 55-65 parts by mass of component A and the mixture into connected spraying equipment, heating to 65-80 ℃, and spraying; when the polyurea composite coating is sprayed, gauge pressure of pressure gauges of the component A and the mixture is controlled to be 1200-1500 Psi, pressure difference between the component A and the mixture is controlled to be below 200Psi, the component A and the mixture are respectively sprayed to the surface of the metal base material in the step 1, and the composite coating is obtained after solidification.
Further, the sugar in the step 2 is one or a mixture of sucrose, fructose, glucose and cellulose.
Further, in the step 3, the polyester polyol is one or more of PPG600, PPG1000, PPG1500, PPG2000, PPG4000, polytetrahydrofuran diol and tetrahydrofuran-propylene oxide copolymerization diol; the diisocyanate is one or more of tetramethylxylylene diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate and isophorone diisocyanate.
Further, in the step 4, the amino-terminated polyether is one or more of amino-terminated polyoxypropylene ether, amino-terminated polyether D-400, amino-terminated polyether D-2000 and amino-terminated polyether T-5000; the amine chain extender is one or a mixture of N, N-dialkyl methyl diamine, diethyl toluene diamine, diacetyl ethylene diamine, dialkyl toluene diphenylamine and isophorone diamine.
Compared with the prior art, the high-strength erosion-resistant polyurea composite coating is prepared by adding BNNSs into the polyurea composite coating in the preparation process of the composite coating, and the organic sugar molecules not only can be used as an intercalating agent to destroy strong van der Waals acting force existing between BN atomic layers, but also can be used as a modifying agent to carry out surface modification on boron nitride by adding sugar in the ball milling h-BN process, so that the prepared BNNSs can be uniformly dispersed in a polyurea system. The BNNSs inherits the good thermal property and excellent lubricating property of h-BN, and has high strength, high temperature resistance, insulation and chemical stability, so that the composite coating has a wider application range. The strength of the polyurea composite coating is improved by introducing BNNSs, when the composite coating is impacted by external force, impact energy can be consumed by boron nitride particles, so that the impact resistance of the coating is enhanced, and when the composite coating is eroded by external force, the laminated BNNSs in the polyurea coating system can be used as a reinforcement body to bear part of load and can be used as a lubricant to play a role in reducing erosion. Therefore, the composite coating prepared by the invention has the excellent characteristics of excellent comprehensive mechanical property, higher strength, better erosion resistance, good impermeability, high curing speed, high construction efficiency, insensitivity to environment and the like, and has simple preparation process, convenient operation, easy realization of industrialization and good application prospect.
Drawings
FIG. 1 is an optical image of a composite coating prepared according to the present invention sprayed onto a metal substrate;
FIG. 2 is an optical image of a composite coating prepared according to the present invention after being subjected to a tape stripping test;
fig. 3 is an optical image of a composite coating prepared according to the present invention after a quicksand erosion test.
Detailed Description
The present invention will be further explained below.
Example 1: the preparation method comprises the following specific steps:
step 1: pretreatment of the metal substrate: polishing a metal base material by using 800-mesh abrasive paper until the surface is smooth, then putting the polished metal base plate into a mixed solution of ethanol and acetone, ultrasonically cleaning the metal base plate for 2 hours by using ultrasonic equipment under the power of 70w, and drying the metal base plate for 1 hour for later use in a 70 ℃ oven after cleaning;
step 2: preparation of BNNSs: adding 5 parts by mass of glucose and 1 part by mass of h-BN into 5 parts by mass of deionized water to form a mixed solution, performing ultrasonic treatment on the mixed solution by using ultrasonic equipment under the power of 50w, stirring for 30min at the speed of 100r/min to uniformly disperse the mixed solution, transferring the mixed solution into a ball milling tank, performing ball milling for 24h at the rotating speed of 500r/min, putting the mixed solution into a centrifuge, performing centrifugal washing for 10min at the rotating speed of 8000r/min, and finally performing freeze drying on the centrifuged mixed solution for 24h to obtain NSBNs;
and step 3: preparation of polyurea A component: dehydrating 30 parts by mass of PPG2000 at 110 ℃ for 3 hours, adding 50 parts by mass of hexamethylene diisocyanate, putting the mixture in an atmosphere furnace with nitrogen as protective gas, heating to 80 ℃ at the heating rate of 3 ℃, preserving heat for 3 hours, cooling along with the furnace, and taking out to obtain a polyurea component A;
and 4, step 4: preparation of polyurea B component: adding 20 parts by mass of amino-terminated polyether D-2000 and 40 parts by mass of diacetyl ethylenediamine into a reaction kettle, stirring at the speed of 50r/min for 10min to uniformly mix the amino-terminated polyether D-2000 and the diacetyl ethylenediamine, heating the reaction kettle to 100 ℃ for reaction for 3h, after the reaction is finished, filling protective gas, opening cooling water to cool to 70 ℃, and taking out the polyurea component after cooling to obtain a polyurea component B;
and 5: preparing a polyurea composite coating: mixing 3 parts by mass of BNNSs into 30 parts by mass of component B, uniformly dispersing to obtain a mixture, adding 60 parts by mass of component A and the mixture into well-connected spraying equipment, and heating to 70 ℃ for spraying; when the polyurea composite coating is sprayed, gauge pressures of pressure gauges of the component A and the mixture are controlled to be 1200-1500 Psi, pressure difference between the component A and the mixture is controlled to be less than 200Psi, the component A and the mixture are respectively sprayed to the surface of the metal base material in the step 1, and the composite coating in the embodiment 1 is obtained after solidification.
Example 2: the preparation method comprises the following specific steps:
step 1: pretreatment of the metal substrate: polishing a metal base material by using 1000-mesh abrasive paper until the surface is smooth, then putting the polished metal base plate into a mixed solution of ethanol and acetone, ultrasonically cleaning the metal base plate for 2 hours by using ultrasonic equipment under the power of 70w, and drying the metal base plate for 2 hours in a 70 ℃ oven for later use after cleaning;
step 2: preparation of BNNSs: adding 10 parts by mass of sucrose and 1 part by mass of h-BN into 5 parts by mass of deionized water to form a mixed solution, performing ultrasonic treatment on the mixed solution by using ultrasonic equipment at a power of 60w, stirring for 30min at a speed of 150r/min to uniformly disperse the mixed solution, transferring the mixed solution into a ball milling tank to perform ball milling for 36h at a rotating speed of 500r/min, putting the mixed solution into a centrifuge to perform centrifugal washing for 10min at a rotating speed of 9000r/min, and finally performing freeze drying on the centrifuged mixed solution for 24h to obtain NSBNs;
and step 3: preparation of polyurea A component: dewatering 30 parts by mass of PPG4000 at 120 ℃ for 2 hours, then adding 50 parts by mass of diphenylmethane diisocyanate, placing the mixture in an atmosphere furnace with nitrogen as protective gas, heating to 70 ℃ at the heating rate of 3 ℃, preserving heat for 3 hours, cooling along with the furnace, and taking out to obtain a polyurea component A;
and 4, step 4: preparation of polyurea B component: adding 30 parts by mass of amino-terminated polyoxypropylene ether and 40 parts by mass of dialkyl toluene diphenylamine into a reaction kettle, stirring at the speed of 100r/min for 10min to uniformly mix the amino-terminated polyoxypropylene ether and the dialkyl toluene diphenylamine, heating the reaction kettle to 110 ℃, reacting for 3h, flushing protective gas after the reaction is finished, opening cooling water to cool to 60 ℃, and taking out the product after the cooling to obtain a polyurea component B;
and 5: preparing a polyurea composite coating: mixing 5 parts by mass of BNNSs into 35 parts by mass of component B, uniformly dispersing to obtain a mixture, adding 60 parts by mass of component A and the mixture into connected spraying equipment, and heating to 65 ℃ for spraying; when the polyurea composite coating is sprayed, gauge pressures of pressure gauges of the component A and the mixture are controlled to be 1200-1500 Psi, pressure difference between the component A and the mixture is controlled to be less than 200Psi, the component A and the mixture are respectively sprayed to the surface of the metal base material in the step 1, and the composite coating in the embodiment 2 is obtained after solidification.
Example 3: the preparation method comprises the following specific steps:
step 1: pretreatment of the metal substrate: polishing a metal base material by using 1000-mesh abrasive paper until the surface is smooth, then putting the polished metal base plate into a mixed solution of ethanol and acetone, ultrasonically cleaning the metal base plate for 1h by using ultrasonic equipment under the power of 70w, and drying the metal base plate for 1h in a 70 ℃ oven for later use after cleaning;
step 2: preparation of BNNSs: adding 5 parts by mass of glucose, 5 parts by mass of cellulose and 5 parts by mass of h-BN into 25 parts by mass of deionized water to form a mixed solution, performing ultrasonic treatment on the mixed solution by using ultrasonic equipment at a power of 50w, simultaneously stirring for 30min at a speed of 120r/min to uniformly disperse the mixed solution, then transferring the mixed solution into a ball milling tank to perform ball milling for 48h at a rotating speed of 500r/min, then putting the mixed solution into a centrifuge to perform centrifugal washing for 10min at a rotating speed of 10000r/min, and finally performing freeze drying on the centrifuged mixed solution for 24h to obtain BNNSs;
and step 3: preparation of polyurea A component: dehydrating 20 parts by mass of polytetrahydrofuran diol and 20 parts by mass of tetrahydrofuran-propylene oxide copolyol at the temperature of 100 ℃ for 3 hours, then adding 30 parts by mass of hexamethylene diisocyanate and 30 parts by mass of xylylene diisocyanate, putting the mixture into an atmosphere furnace with nitrogen as protective gas, heating to 80 ℃ at the heating rate of 3 ℃, preserving heat for 5 hours, cooling along with the furnace, and taking out to obtain a polyurea component A;
and 4, step 4: preparation of polyurea B component: adding 20 parts by mass of amino-terminated polyether D-2000, 30 parts by mass of amino-terminated polyether T-5000, 30 parts by mass of diacetyl ethylenediamine and 20 parts by mass of diethyl toluenediamine into a reaction kettle, stirring for 10min at the speed of 50r/min to uniformly mix, then heating the reaction kettle to 120 ℃ for reaction for 3h, after the reaction is finished, injecting protective gas, opening cooling water to cool to 70 ℃, and taking out the mixture after cooling to obtain a polyurea component B;
and 5: preparing a polyurea composite coating: mixing 10 parts by mass of BNNSs into 30 parts by mass of component B, uniformly dispersing to obtain a mixture, adding 55 parts by mass of component A and the mixture into well-connected spraying equipment, and heating to 70 ℃ for spraying; when the polyurea composite coating is sprayed, gauge pressures of pressure gauges of the component A and the mixture are controlled to be 1200-1500 Psi, pressure difference between the component A and the mixture is controlled to be less than 200Psi, the component A and the mixture are respectively sprayed to the surface of the metal base material in the step 1, and the composite coating in the embodiment 3 is obtained after solidification.
And (3) performance verification:
any one of the composite coatings prepared in examples 1 to 3 was selected, and as shown in fig. 1, it was observed that the coating had a smooth surface and no defects such as pinholes, projections, etc.
Testing the strength of the composite coating: the composite coating is subjected to an adhesive tape peeling test, and the adhesive tape is repeatedly pressed and pulled on the surface of the coating for 50 times, as shown in fig. 2, the surface of the coating after the peeling test still keeps complete, which shows that the coating has higher strength and stronger bonding force with a metal matrix, and can resist external force to peel off the coating, so that the coating can well protect the metal matrix.
Testing the erosion resistance of the composite coating: any one of the composite coatings prepared in the embodiments 1 to 3 of the invention is selected, a quicksand erosion test is carried out on the composite coating, the coating is eroded for 30min at a height of 20cm and a sand yield of 5g/s, as shown in a photo-mirror photograph in fig. 3, the surface of the coating still keeps complete after the quicksand erosion, which shows that the coating has good erosion resistance, so that the coating can well protect a metal matrix.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (4)
1. A preparation method of a polyurea composite coating with high strength and erosion resistance is characterized by comprising the following specific steps:
step 1: pretreatment of the metal substrate: polishing a metal base material by using 800-1200-mesh abrasive paper until the surface is smooth, then putting the polished metal base material into a mixed solution of ethanol and acetone, ultrasonically cleaning the metal base material for 1-2 hours by using ultrasonic equipment under the power of 70-80 w, and drying the metal base material in an oven at the temperature of 70-80 ℃ for 1-2 hours for later use after cleaning;
step 2: preparation of BNNSs: adding 5-10 parts by mass of sugar and 1-5 parts by mass of h-BN into deionized water to form a mixed solution, performing ultrasonic treatment on the mixed solution by using ultrasonic equipment under the power of 50-60 w, stirring for 20-30 min at the speed of 100-150 r/min to uniformly disperse the mixed solution, transferring the mixed solution into a ball milling tank to perform ball milling for 24-48 h at the rotating speed of 500r/min, putting the mixed solution into a centrifuge to perform centrifugal washing for 10min at the rotating speed of 8000-10000 r/min, and finally performing freeze drying on the centrifuged mixed solution for 24h to obtain BNNSs; wherein the mass ratio of the h-BN to the deionized water is 1: 5;
and step 3: preparation of polyurea A component: dehydrating 30-50 parts by mass of polyester polyol at 100-120 ℃ for 2-4 h, adding 40-60 parts by mass of diisocyanate, placing the mixture in an atmosphere furnace with protective gas, heating to 70-80 ℃ at a heating rate of 3-5 ℃, preserving heat for 3-5 h, cooling along with the furnace, and taking out to obtain a polyurea component A;
and 4, step 4: preparation of polyurea B component: adding 20-60 parts by mass of amino-terminated polyether and 40-60 parts by mass of amine chain extender into a reaction kettle, stirring at the speed of 50-100 r/min for 10-30 min to uniformly mix, then heating the reaction kettle to 100-120 ℃ for reaction for 3h, after the reaction is finished, injecting protective gas, opening cooling water to cool to 60-70 ℃, and taking out the cooled polyurea component B to obtain the polyurea component B;
and 5: preparing a polyurea composite coating: mixing 3-10 parts by mass of BNNSs into 30-40 parts by mass of component B, uniformly dispersing to obtain a mixture, adding 55-65 parts by mass of component A and the mixture into connected spraying equipment, heating to 65-80 ℃, and spraying; when the polyurea composite coating is sprayed, gauge pressure of pressure gauges of the component A and the mixture is controlled to be 1200-1500 Psi, pressure difference between the component A and the mixture is controlled to be below 200Psi, the component A and the mixture are respectively sprayed to the surface of the metal base material in the step 1, and the composite coating is obtained after solidification.
2. The method for preparing the polyurea composite coating with high strength and erosion resistance according to claim 1, wherein the sugar in the step 2 is one or more of sucrose, fructose, glucose and cellulose.
3. The method for preparing the polyurea composite coating with high strength and erosion resistance according to claim 1, wherein the polyester polyol in the step 3 is one or more of PPG600, PPG1000, PPG1500, PPG2000, PPG4000, polytetrahydrofuran diol, and tetrahydrofuran-propylene oxide copolyol; the diisocyanate is one or more of tetramethylxylylene diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate and isophorone diisocyanate.
4. The method for preparing the polyurea composite coating with high strength and erosion resistance according to claim 1, wherein the amino-terminated polyether in the step 4 is one or more of amino-terminated polyoxypropylene ether, amino-terminated polyether D-400, amino-terminated polyether D-2000 and amino-terminated polyether T-5000; the amine chain extender is one or a mixture of N, N-dialkyl methyl diamine, diethyl toluene diamine, diacetyl ethylene diamine, dialkyl toluene diphenylamine and isophorone diamine.
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Application publication date: 20210831 |