CN113045974A - Preparation method of impact-resistant graphene polyurea composite coating for impeller surface - Google Patents
Preparation method of impact-resistant graphene polyurea composite coating for impeller surface Download PDFInfo
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Abstract
The invention discloses a preparation method of an anti-impact graphene polyurea composite coating for the surface of a impeller, which comprises the steps of respectively preparing A, B, C, D components, mixing A and D components, mixing B and C components, controlling the pressure gauge pressures of A, D mixed components and B, C mixed components to be 1200-1500 Psi, controlling the pressure difference between the two components to be less than 200Psi, spraying, and solidifying to obtain the graphene/polyurea composite coating. The composite coating enables the surface of the impeller to have better impact resistance and wear resistance, thereby effectively prolonging the service life of the impeller.
Description
Technical Field
The invention relates to a preparation method of an anti-impact graphene polyurea composite coating for the surface of an impeller, and belongs to the technical field of composite coating materials.
Background
The sand making machine is important equipment for manually making sand, has very good effect when used for processing hard quartzite, granite, basalt, diabase, andesite and the like, has quite large sand making capacity and sand output, and can meet the requirements of industries such as mines, buildings, chemical engineering and the like on sandstone aggregates. However, the sand making machine is affected by the properties of the materials to be crushed and the service time, and is prone to cause the phenomenon of equipment abrasion in the use process, for example, the materials cause abrasion to the impeller due to severe impact, so that the sand making machine cannot work normally, and the efficiency of the equipment is reduced.
Polyurea is a highly abrasion resistant elastomeric material formed by the reaction of an isocyanate component and an amino compound component. The polyurea spraying technology breaks through the limitation of the wear-resistant material in mold forming, is a process of on-site curing and rapid forming, is a solvent-free and pollution-free green construction technology integrating a new technology, a new material and a new process, and is called as a universal coating technology in the industry. Meanwhile, the polyurea material has the advantages of excellent wear resistance, outstanding corrosion and aging resistance, low comprehensive cost and the like, and has a very wide application prospect. Graphene as a novel two-dimensional nano material has excellent mechanical property and wear resistance, the intrinsic strength is as high as 130GPa, and the graphene/polyurea composite coating has a unique two-dimensional plane structure, so that the shearing force between sheet layers is very small, the friction coefficient is extremely low, and the graphene/polyurea composite coating has more stable antifriction and wear resistance than carbon materials such as fullerene, carbon nano tube and graphite, so that the graphene/polyurea composite coating can be organically combined to form the graphene/polyurea composite coating, has the advantages of the graphene and the polyurea, and realizes higher impact resistance.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a preparation method of the anti-impact graphene polyurea composite coating for the surface of the impeller, and the anti-impact graphene polyurea composite coating is sprayed on the surface of the impeller, so that the surface of the impeller has better anti-impact wear performance, and the service life of the impeller is effectively prolonged.
In order to achieve the purpose, the invention adopts the technical scheme that: a preparation method of an anti-impact graphene polyurea composite coating for the surface of a impeller comprises the following specific steps:
step 1: preparing a coating A component:
carbonizing diimine modified isophorone diisocyanate, xylylene diisocyanate and hydrogenated diphenylmethane diisocyanate in a protective atmosphere, mixing the diimine modified isophorone diisocyanate, the xylylene diisocyanate and the hydrogenated diphenylmethane diisocyanate, continuously stirring at the temperature of 80-120 ℃, keeping the temperature for 2-4 hours, cooling to the temperature of 60-70 ℃, dropwise adding fat-based branched polyester triol into the mixture, dropwise adding polycaprolactone diol, heating to 80-100 ℃, and keeping the temperature for reaction for 4-6 hours to obtain a coating A component;
wherein, the carbodiimide modified isophorone diisocyanate accounts for 25 to 28 percent of the component A by mass; the carbodiimide modified xylylene diisocyanate accounts for 20 to 24 percent of the component A by mass; the carbodiimide modified hydrogenated diphenylmethane diisocyanate accounts for 10 to 13 percent of the mass ratio of the component A; the weight ratio of the grease-based branched polyester triol to the component A is 25-30 percent; the polycaprolactone diol accounts for 10 to 15 percent of the component A by mass;
step 2: preparing a coating B component:
mixing isophorone diamine, 1, 4-bis-sec-butyl aminobenzene and 4, 4-methylene bis (2, 6-diethylaniline), dispersing at the rotating speed of 2000r/min for 1-2 hours, then dropwise adding tetrahydroxypropyl diamine, then dropwise adding amino-terminated polyether, and ultrasonically dispersing for more than 30 minutes to obtain a coating B component;
wherein, the mass ratio of the isophorone diamine in the component B is 14-18%; the 1, 4-bis-sec-butyl aminobenzene accounts for 20-27% of the component B by mass; the mass ratio of the 4, 4-methylene bis (2, 6-diethylaniline) in the component B is 26-35 percent; the tetrahydroxypropyldiamine accounts for 8 to 15 percent of the mass ratio of the component B; the amino-terminated polyether accounts for 12 to 25 percent of the mass ratio of the component B;
and step 3: preparing a coating C component:
mixing DY-E44 type epoxy resin and DY-E6012 type curing agent, adding into absolute ethyl alcohol, dispersing at the rotating speed of 2400r/min for 1-2 hours, adding methyl silicone oil, polyhexamethylcyclodisiloxane and diglycidyl ether end-capped polydimethylsiloxane, and performing ultrasonic dispersion for more than 30 minutes to obtain a coating C component;
wherein, DY-E44 type epoxy resin accounts for 58 to 72 percent of the mass ratio of the component C; the DY-E6012 type curing agent accounts for 22-30% of the mass ratio of the C component; the methyl silicone oil accounts for 3 to 5 percent of the mass ratio of the component C; the polyhexamethylcyclodisiloxane accounts for 2-4% of the component C by mass; the diglycidyl ether end-capped polydimethylsiloxane accounts for 1 to 3 percent of the mass ratio of the component C;
and 4, step 4: preparing a coating D component:
adding the modified graphene powder, isopropyl triethoxysilane and ethyl orthosilicate into absolute ethyl alcohol, and performing ultrasonic dispersion for more than 30 minutes to obtain a coating D component;
wherein the modified graphene powder accounts for 65-85% of the component D by mass; isopropyl triethoxysilane (IPTS) accounts for 10-25% of the component D by mass; the weight ratio of Tetraethoxysilane (TEOS) to the component D is 5-10 percent;
step 5, preparing the graphene/polyurea composite coating according to the following method:
adding the component D into the component A, heating to 65-75 ℃, and stirring and mixing for 30-80 minutes on a heating type magnetic stirrer; adding the component C into the component B, and dispersing for 1-2 hours at a rotating speed of 3000 r/min; adding the mixed components into connected spraying equipment and heating to 65-75 ℃; when the graphene/polyurea composite coating is sprayed, the pressure gauge pressures of the A, D mixed component and the B, C mixed component are controlled to be 1200-1500 Psi, the pressure difference between the A, D mixed component and the B, C mixed component is controlled to be less than 200Psi, spraying is carried out, and the graphene/polyurea composite coating is obtained after solidification.
Further, in the step 2, the amine-terminated polyether is dropwise added, and then the polyether polyamine is added, wherein the added polyether polyamine accounts for 0-6% of the mass ratio of the component B. The addition of polyether polyamine can improve the adhesive property of the component B of the coating.
Further, in the step 3, monoglycidyl ether terminated polydimethylsiloxane is added when methyl silicone oil, polyhexamethylene cyclodisiloxane and diglycidyl ether terminated polydimethylsiloxane are mixed, wherein the added monoglycidyl ether terminated polydimethylsiloxane accounts for 0-4% of the component C by mass. The lubricity of coating C component can be improved by adding monoglycidyl ether terminated polydimethylsiloxane.
Further, in the step 4, polytetrafluoro wax is mixed with the modified graphene powder, isopropyl triethoxysilane and ethyl orthosilicate, and the added polytetrafluoro wax accounts for 0-4% of the component C by mass. The hardness and lubricity of the coating D component can be improved by adding polytetrafluoro wax.
Further, the modified graphene powder in step 3 is one or a mixture of graphene/polydopamine, graphene/cerium oxide, graphene/zinc oxide, graphene/iron oxide, and graphene/molybdenum disulfide.
Compared with the prior art, A, B, C, D components are prepared respectively, then the A component and the D component are mixed, the B component and the C component are mixed, finally, the pressure gauge pressures of the A, D mixed component and the B, C mixed component are controlled to be 1200-1500 Psi, the pressure difference between the two is controlled to be less than 200Psi, spraying is carried out, and the graphene/polyurea composite coating is obtained after solidification. The composite coating enables the surface of the impeller to have better impact resistance and wear resistance, thereby effectively prolonging the service life of the impeller.
Drawings
FIG. 1 is a micrograph under an optical microscope of example 1 of the present invention;
FIG. 2 is a micrograph under an optical microscope of inventive example 1 after 2 hours of rubbing with a rotary rubbing machine under a load of 15N;
FIG. 3 is a graph showing the dynamic friction coefficient obtained by rubbing examples 1, 2 and 3 of the present invention with a rotary friction machine under a load of 15N for 2 hours.
Detailed Description
The present invention will be further explained below.
Example 1
Pretreatment of a body: the sample substrate is A3 steel, and 40 # corundum sand is adopted for sand blasting treatment, the surface roughness reaches Sa2.5 grade, and the sample substrate is used immediately after sand blasting;
preparation of a component A: adding 250g of carbodiimide modified isophorone diisocyanate, 200g of carbodiimide modified xylylene diisocyanate and 130g of carbodiimide modified hydrogenated diphenylmethane diisocyanate into a three-neck flask, introducing nitrogen, heating to 100 ℃, continuously stirring, keeping the temperature for 2 hours, cooling to 70 ℃, dropwise adding 270g of grease-based branched polyester triol, dropwise adding 150g of polycaprolactone diol, heating to 80 ℃, keeping the temperature for 4 hours, and introducing nitrogen into the obtained reactant to seal at normal temperature for later use;
b, preparation of a component: mixing 120g of isophorone diamine, 200g of 1, 4-bis-sec-butyl aminobenzene and 240g of 4, 4-methylene bis (2, 6-diethylaniline), dispersing for 2 hours at the rotating speed of 2000r/min, then dropwise adding 80g of tetrahydroxypropyl diamine, then dropwise adding 160g of amino-terminated polyether, and ultrasonically dispersing for 40 minutes to obtain a coating B component;
c, preparation of a component: mixing 114gDY-E44 type epoxy resin and 57g DY-E6012 type curing agent, adding the mixture into 100mL of absolute ethyl alcohol, dispersing for 2 hours at the rotating speed of 2400r/min, adding 9.5g of methyl silicone oil, 5.7g of polyhexamethylene cyclic disiloxane and 3.8g of diglycidyl ether end-capped polydimethylsiloxane, and performing ultrasonic dispersion for 40 minutes to obtain a coating C component;
preparing a component D: adding 7.5g of graphene/polydopamine powder, 0.8g of isopropyl triethoxysilane and 1.7g of ethyl orthosilicate into 50mL of absolute ethanol, and performing ultrasonic dispersion for 30 minutes to obtain a coating D component;
preparing the graphene/polyurea composite coating:
adding the component D prepared in the step into the component A, heating to 70 ℃, stirring for 60 minutes on a heating type magnetic stirrer, adding the component C into the component B, dispersing for 1 hour at the rotating speed of 3000r/min, adding the mixed components into connected spraying equipment, heating to 70 ℃, controlling the pressure gauge pressure of the A, D mixed component and the pressure gauge pressure of the B, C mixed component to be 1200-1500 Psi when spraying the graphene/polyurea composite coating, and controlling the pressure difference between the two to be less than 200Psi for spraying, thereby obtaining the graphene/polyurea composite coating of the embodiment 1.
Example 2
The substrate was treated and A, C components were prepared in the manner described in example 1;
b, preparation of a component: mixing 114g of isophorone diamine, 192g of 1, 4-bis-sec-butyl aminobenzene and 226g of 4, 4-methylene bis (2, 6-diethylaniline), dispersing for 2 hours at the rotating speed of 2000r/min, then sequentially dropwise adding 76g of tetrahydroxypropyl diamine and 152g of amine-terminated polyether 40g of polyether polyamine, and ultrasonically dispersing for 40 minutes to obtain a coating B component;
preparing a component D: adding 7.5g of graphene/cerium oxide powder, 0.8g of isopropyl triethoxysilane and 1.7g of ethyl orthosilicate into 50mL of absolute ethanol, and performing ultrasonic dispersion for 30 minutes to obtain a coating D component;
preparing the graphene/polyurea composite coating:
adding the component D prepared in the step into the component A, heating to 75 ℃, stirring for 60 minutes on a heating type magnetic stirrer, adding the component C into the component B, dispersing for 1 hour at the rotating speed of 2500r/min, adding the mixed components into connected spraying equipment, heating to 75 ℃, controlling the pressure gauge pressure of the A, D mixed component and the B, C mixed component to be 1300-1500Psi when spraying the graphene/polyurea composite coating, and spraying the graphene/polyurea composite coating with the pressure difference of the two being less than 150Psi, thereby obtaining the graphene/polyurea composite coating of the embodiment 2.
Example 3
The substrate was treated and A, B components were prepared in the manner described in example 1;
c, preparation of a component: mixing 114gDY-E44 type epoxy resin and 57gDY-E6012 type curing agent, adding the mixture into 100mL of absolute ethyl alcohol, dispersing for 2 hours at the rotating speed of 2400r/min, adding 7.5g of methyl silicone oil, 4.7g of polyhexamethylene cyclic disiloxane, 3g of diglycidyl ether end-capped polydimethylsiloxane and 3.8g of monoglycidyl ether end-capped polydimethylsiloxane, and dispersing for 40 minutes by ultrasonic to obtain a coating component C;
preparing a component D: adding 7.1g of graphene/molybdenum disulfide powder, 0.8g of isopropyl triethoxysilane, 1.7g of ethyl orthosilicate and 0.4g of polytetrafluoro wax into 50mL of absolute ethanol, and performing ultrasonic dispersion for 30 minutes to obtain a coating D component;
preparing the graphene/polyurea composite coating:
adding the component D prepared in the step into the component A, heating to 75 ℃, stirring for 1 hour on a heating type magnetic stirrer, adding the component C into the component B, dispersing for 1 hour at the rotating speed of 2500r/min, adding the mixed components into connected spraying equipment, heating to 75 ℃, controlling the pressure gauge pressure of the A, D mixed component and the B, C mixed component between 1300 and 1500Psi when spraying the graphene/polyurea composite coating, and spraying when the pressure difference between the two is less than 150Psi, thereby obtaining the graphene/polyurea composite coating of the embodiment 3.
And (3) performance verification:
the composite coatings prepared in examples 1, 2 and 3 were all observed under an optical microscope, as shown in fig. 1, which is a micrograph of example 1, from which it can be seen that the coating was smooth and flat.
The composite coatings prepared in examples 1, 2 and 3 were respectively rubbed with a rotary rubbing machine under a load of 15N for 2 hours, and then observed under an optical microscope, as shown in fig. 2, which is a micrograph of the composite coating prepared in example 1 after rubbing, it can be seen from the micrograph that the coating is still intact after rubbing for 2 hours under a load of 15N, and only a slight wear scar remains on the surface of the coating, which indicates that the graphene/polyurea composite coating prepared in example 1 has good wear resistance. And in the examples 1, 2 and 3, the friction coefficient of the surface is monitored in real time in the friction process, so that a dynamic friction coefficient graph is drawn, as shown in fig. 3, if the friction coefficient fluctuation is large, the change of the friction coefficient caused by the failure of the coating at the position is shown, and as can be seen from the graph, the friction coefficient can be kept to have good stability in the friction process by all the three examples, so that the graphene/polyurea composite coating of the three examples can also be shown to have good wear resistance.
Finally, the surfaces of the impeller covered with the graphene/polyurea composite coatings of the embodiments and the surface of the impeller without the coatings are manually impacted for multiple times by adopting a 3000g weight, and then through direct observation of personnel, only fine traces can be found on the surfaces of the impeller with the coatings of the embodiments, and obvious sunken traces are formed on the surfaces of the impeller without the coatings, so that the graphene/polyurea composite coatings of the embodiments have good impact resistance on the surfaces of the impeller.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. A preparation method of an anti-impact graphene polyurea composite coating for the surface of a impeller is characterized by comprising the following specific steps:
step 1: preparing a coating A component:
carbonizing diimine modified isophorone diisocyanate, xylylene diisocyanate and hydrogenated diphenylmethane diisocyanate in a protective atmosphere, mixing the diimine modified isophorone diisocyanate, the xylylene diisocyanate and the hydrogenated diphenylmethane diisocyanate, continuously stirring at the temperature of 80-120 ℃, keeping the temperature for 2-4 hours, cooling to the temperature of 60-70 ℃, dropwise adding fat-based branched polyester triol into the mixture, dropwise adding polycaprolactone diol, heating to 80-100 ℃, and keeping the temperature for reaction for 4-6 hours to obtain a coating A component;
wherein, the carbodiimide modified isophorone diisocyanate accounts for 25 to 28 percent of the component A by mass; the carbodiimide modified xylylene diisocyanate accounts for 20 to 24 percent of the component A by mass; the carbodiimide modified hydrogenated diphenylmethane diisocyanate accounts for 10 to 13 percent of the mass ratio of the component A; the weight ratio of the grease-based branched polyester triol to the component A is 25-30 percent; the polycaprolactone diol accounts for 10 to 15 percent of the component A by mass;
step 2: preparing a coating B component:
mixing isophorone diamine, 1, 4-bis-sec-butyl aminobenzene and 4, 4-methylene bis (2, 6-diethylaniline), dispersing at the rotating speed of 2000r/min for 1-2 hours, then dropwise adding tetrahydroxypropyl diamine, then dropwise adding amino-terminated polyether, and ultrasonically dispersing for more than 30 minutes to obtain a coating B component;
wherein, the mass ratio of the isophorone diamine in the component B is 14-18%; the 1, 4-bis-sec-butyl aminobenzene accounts for 20-27% of the component B by mass; the mass ratio of the 4, 4-methylene bis (2, 6-diethylaniline) in the component B is 26-35 percent; the tetrahydroxypropyldiamine accounts for 8 to 15 percent of the mass ratio of the component B; the amino-terminated polyether accounts for 12 to 25 percent of the mass ratio of the component B;
and step 3: preparing a coating C component:
mixing DY-E44 type epoxy resin and DY-E6012 type curing agent, adding into absolute ethyl alcohol, dispersing at the rotating speed of 2400r/min for 1-2 hours, adding methyl silicone oil, polyhexamethylcyclodisiloxane and diglycidyl ether end-capped polydimethylsiloxane, and performing ultrasonic dispersion for more than 30 minutes to obtain a coating C component;
wherein, DY-E44 type epoxy resin accounts for 58 to 72 percent of the mass ratio of the component C; the DY-E6012 type curing agent accounts for 22-30% of the mass ratio of the C component; the methyl silicone oil accounts for 3 to 5 percent of the mass ratio of the component C; the polyhexamethylcyclodisiloxane accounts for 2-4% of the component C by mass; the diglycidyl ether end-capped polydimethylsiloxane accounts for 1 to 3 percent of the mass ratio of the component C;
and 4, step 4: preparing a coating D component:
adding the modified graphene powder, isopropyl triethoxysilane and ethyl orthosilicate into absolute ethyl alcohol, and performing ultrasonic dispersion for more than 30 minutes to obtain a coating D component;
wherein the modified graphene powder accounts for 65-85% of the component D by mass; isopropyl triethoxysilane (IPTS) accounts for 10-25% of the component D by mass; the weight ratio of Tetraethoxysilane (TEOS) to the component D is 5-10 percent;
step 5, preparing the graphene/polyurea composite coating according to the following method:
adding the component D into the component A, heating to 65-75 ℃, and stirring and mixing for 30-80 minutes on a heating type magnetic stirrer; adding the component C into the component B, and dispersing for 1-2 hours at a rotating speed of 3000 r/min; adding the mixed components into connected spraying equipment and heating to 65-75 ℃; when the graphene/polyurea composite coating is sprayed, the gauge pressure of pressure gauges of the A, D mixed component and the B, C mixed component is controlled to be 1200-1500 Psi, the pressure difference between the pressure gauges is controlled to be less than 200Psi, spraying is carried out, and the graphene/polyurea composite coating is obtained after solidification.
2. The preparation method of the graphene polyurea composite coating for the impeller surface impact resistance according to claim 1, wherein the step 2 is carried out by adding the amine-terminated polyether dropwise and then adding the polyether polyamine, wherein the added polyether polyamine accounts for 0-6% of the B component by mass.
3. The preparation method of the graphene polyurea composite coating for the impeller surface impact resistance according to claim 1, wherein in the step 3, the monoglycidyl ether terminated polydimethylsiloxane is added when the methyl silicone oil, the polyhexamethylene cyclodisiloxane and the diglycidyl ether terminated polydimethylsiloxane are mixed, and the added monoglycidyl ether terminated polydimethylsiloxane accounts for 0-4% of the component C by mass.
4. The preparation method of the impeller surface impact-resistant graphene polyurea composite coating according to claim 1, wherein in the step 4, polytetrafluoro wax is mixed with the modified graphene powder, isopropyl triethoxysilane and ethyl orthosilicate, and the added polytetrafluoro wax accounts for 0-4% of the mass ratio of the C component.
5. The preparation method of the impact-resistant graphene polyurea composite coating on the surface of the impeller according to claim 1, wherein the modified graphene powder in the step 3 is one or more of graphene/polydopamine, graphene/cerium oxide, graphene/zinc oxide, graphene/iron oxide, and graphene/molybdenum disulfide.
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