A kind of aging-resistant centrifugal pump shell coating and preparation method thereof

Abstract

The invention relates to the technical field of centrifugal pumps, and discloses an aging-resistant centrifugal pump housing coating and a preparation method thereof, comprising the following components: acrylic resin, fluorocarbon resin, silicone oil, modified carbon nanotubes, coupling agent, dimethyldichlorosilane, hydrogenated rosin glycerol ester, and solvent; the invention uses acrylic resin and fluorocarbon resin as matrix polymer resins, and the two are combined to greatly improve the mechanical properties of the coating, and at the same time, by introducing multiple components to work together, the corrosion resistance and aging resistance of the coating can be significantly improved, and then, the service life of the coating can be effectively improved, and it can be better applied to the surface of the centrifugal pump housing, and the centrifugal pump housing has a better protective effect.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal pumps, in particular to an aging-resistant centrifugal pump shell coating and a preparation method thereof. Background Art

[0002] A centrifugal pump is a pump that uses the rotation of the impeller to cause water to move centrifugally. Since the liquids transported by centrifugal pumps cover a wide range, they often encounter liquids containing large particles or corrosive liquids. Centrifugal pumps have many advantages such as compact structure, wide flow and head range, large liquid transport capacity, uniform and stable flow, easy use, and low cost, so they can be widely used in many industries.

[0003] Since centrifugal pumps can be used in a variety of industries, the liquids or corrosive factors in the air that they come into contact with will cause certain corrosion to the centrifugal pump casing. In order to improve the corrosion resistance of the centrifugal pump casing, the prior art coats the centrifugal pump casing with paint. However, ultraviolet rays in the air will also have a relatively strong aging effect on the coating, causing the service life of the coating to be greatly reduced.

[0004] Based on this, we proposed an aging-resistant centrifugal pump casing coating, hoping to solve the shortcomings of the existing technology. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the deficiencies in the prior art, the present invention provides an aging-resistant coating for a centrifugal pump housing and a preparation method thereof.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0009] An aging-resistant centrifugal pump housing coating comprises the following components by weight: 60-65 parts of acrylic resin, 20-28 parts of fluorocarbon resin, 5-8 parts of silicone oil, 8-15 parts of modified carbon nanotubes, 1-2 parts of coupling agent, 0.5-1 parts of dimethyldichlorosilane, 1-3 parts of hydrogenated rosin glycerol ester and 60-70 parts of solvent.

[0010] As a further technical solution, the preparation method of modified carbon nanotubes is:

[0011] (1) adding carbon nanotubes to an oxidizing acid solution, adjusting the temperature to 78° C., stirring and reacting for 30 minutes, then filtering, washing to neutrality, and drying to obtain oxidized carbon nanotubes;

[0012] (2) adding halloysite to an alkaline solution, adjusting the temperature to 62° C., stirring and reacting for 30 min, filtering, washing to neutrality, and drying to obtain modified halloysite;

[0013] (3) uniformly dispersing the oxidized carbon nanotubes and the modified halloysite in N,N-dimethylformamide to obtain a mixed dispersion;

[0014] (4) Add epichlorohydrin and maleimide to the mixed dispersion obtained above, adjust the temperature to 74°C, keep warm and stir for 3 hours, and then centrifuge, wash, freeze-dry, crush and grind to obtain modified carbon nanotubes.

[0015] As a further technical solution, the oxidizing acid solution in step (1) is a mixed solution of nitric acid and sulfuric acid;

[0016] The mass fraction of nitric acid is 4.5%;

[0017] The mass fraction of sulfuric acid is 7.2%;

[0018] The mixing ratio of the carbon nanotubes and the oxidizing acid solution is 10-12 g:100 mL.

[0019] As a further technical solution: the alkaline solution in step (2) is a sodium hydroxide solution;

[0020] The concentration of the sodium hydroxide solution is 1.8 mol / L;

[0021] The mixing ratio of the halloysite and the sodium hydroxide solution is 14.5 g:110 mL.

[0022] As a further technical solution: the mixing ratio of the oxidized carbon nanotubes, modified halloysite and N,N-dimethylformamide in step (3) is: 20g:3g:100mL.

[0023] As a further technical solution, the mixing ratio of the mixed dispersion, epichlorohydrin and maleimide in step (4) is 100mL:3.75g:5.28g.

[0024] As a further technical solution, the silicone oil is:

[0025] Silicone oil with viscosity lower than 120cst.

[0026] As a further technical solution: the coupling agent is a titanate coupling agent.

[0027] As a further technical solution: the solvent is ethyl acetate.

[0028] A method for preparing an aging-resistant centrifugal pump housing coating, comprising:

[0029] First, weigh each raw material according to its weight;

[0030] Add acrylic resin, fluorocarbon resin, dimethyldichlorosilane and hydrogenated rosin glycerol ester to the solvent respectively, stir at 1000r / min for 30min at room temperature, then add silicone oil and modified carbon nanotubes, adjust the speed to 1200r / min, continue stirring for 40min, add coupling agent, adjust the temperature to 75℃, keep stirring for 1 hour to obtain the coating, apply the coating evenly to the surface of the centrifugal pump, and dry it.

[0031] The present invention introduces modified carbon nanotubes. Firstly, after the carbon nanotubes are modified, the aggregation effect of the nanofiller can be effectively reduced, and the dispersibility of the nanofiller in the coating matrix can be improved, thereby more effectively improving the performance of the coating.

[0032] By introducing modified carbon nanotubes, they can connect with polymer molecular chains to form a stable network structure, strengthen network nodes, and effectively fill the pores of the polymer itself, making the coating more continuous and closed. The density and flatness of the coating surface are greatly improved. It not only has a certain degree of stain resistance, but also can better block corrosion factors and reduce the contact of corrosion factors with the centrifugal pump casing material, thereby improving the corrosion resistance of the centrifugal pump. In addition, the impact resistance and aging resistance of the coating are significantly improved, thereby increasing the service life of the coating.

[0033] (III) Beneficial effects

[0034] Compared with the prior art, the present invention provides an aging-resistant centrifugal pump housing coating, which has the following beneficial effects:

[0035] The present invention uses acrylic resin and fluorocarbon resin as base polymer resins, and the combination of the two can greatly improve the mechanical properties of the coating. At the same time, by introducing multiple components to work together, the corrosion resistance and aging resistance of the coating can be significantly improved. Furthermore, the service life of the coating can be effectively improved, and it can be better applied to the surface of the centrifugal pump casing, thereby playing a better protective role on the centrifugal pump casing. DETAILED DESCRIPTION

[0036] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Example 1

[0038] An aging-resistant centrifugal pump housing coating comprises the following components by weight: 60 parts of acrylic resin, 20 parts of fluorocarbon resin, 5 parts of silicone oil, 8 parts of modified carbon nanotubes, 1 part of titanate coupling agent, 0.5 parts of dimethyldichlorosilane, 1 part of hydrogenated rosin glycerol ester, and 70 parts of ethyl acetate.

[0039] The preparation method of modified carbon nanotubes is as follows:

[0040] (1) adding carbon nanotubes to an oxidizing acid solution, adjusting the temperature to 78° C., stirring and reacting for 30 minutes, then filtering, washing to neutrality, and drying to obtain oxidized carbon nanotubes; the oxidizing acid solution is a mixed solution of nitric acid and sulfuric acid;

[0041] The mass fraction of nitric acid is 4.5%;

[0042] The mass fraction of sulfuric acid is 7.2%;

[0043] The mixing ratio of the carbon nanotubes and the oxidizing acid solution is 10 g:100 mL.

[0044] (2) adding halloysite to an alkaline solution, adjusting the temperature to 62° C., stirring and reacting for 30 min, filtering, washing to neutrality, and drying to obtain modified halloysite; the alkaline solution is a sodium hydroxide solution;

[0045] The concentration of the sodium hydroxide solution is 1.8 mol / L;

[0046] The mixing ratio of the halloysite and the sodium hydroxide solution is 14.5 g:110 mL.

[0047] (3) The oxidized carbon nanotubes and the modified halloysite are uniformly dispersed in N,N-dimethylformamide to obtain a mixed dispersion; the mixing ratio of the oxidized carbon nanotubes, the modified halloysite and the N,N-dimethylformamide is 20 g: 3 g: 100 mL.

[0048] (4) Add epichlorohydrin and maleimide to the mixed dispersion obtained above, adjust the temperature to 74°C, keep stirring for 3 hours, and then centrifuge, wash, freeze-dry, crush and grind to obtain modified carbon nanotubes; the mixing ratio of the mixed dispersion, epichlorohydrin and maleimide is 100mL:3.75g:5.28g.

[0049] A method for preparing an aging-resistant centrifugal pump housing coating, comprising:

[0050] First, weigh each raw material according to its weight;

[0051] Add acrylic resin, fluorocarbon resin, dimethyldichlorosilane and hydrogenated rosin glycerol ester to ethyl acetate respectively, stir at 1000r / min for 30min at room temperature, then add silicone oil and modified carbon nanotubes, adjust the speed to 1200r / min, continue stirring for 40min, add titanate coupling agent, adjust the temperature to 75℃, keep stirring for 1 hour to obtain the coating, evenly apply the coating to the surface of the centrifugal pump, and dry it.

[0052] Example 2

[0053] An aging-resistant centrifugal pump housing coating comprises the following components by weight: 62 parts of acrylic resin, 22 parts of fluorocarbon resin, 6 parts of silicone oil, 10 parts of modified carbon nanotubes, 1.2 parts of titanate coupling agent, 0.8 parts of dimethyldichlorosilane, 2 parts of hydrogenated rosin glycerol ester, and 65 parts of ethyl acetate.

[0054] The preparation method of modified carbon nanotubes is as follows:

[0055] (1) adding carbon nanotubes to an oxidizing acid solution, adjusting the temperature to 78° C., stirring and reacting for 30 minutes, then filtering, washing to neutrality, and drying to obtain oxidized carbon nanotubes; the oxidizing acid solution is a mixed solution of nitric acid and sulfuric acid;

[0056] The mass fraction of nitric acid is 4.5%;

[0057] The mass fraction of sulfuric acid is 7.2%;

[0058] The mixing ratio of the carbon nanotubes and the oxidizing acid solution is 11 g:100 mL.

[0059] (2) adding halloysite to an alkaline solution, adjusting the temperature to 62° C., stirring and reacting for 30 min, filtering, washing to neutrality, and drying to obtain modified halloysite; the alkaline solution is a sodium hydroxide solution;

[0060] The concentration of the sodium hydroxide solution is 1.8 mol / L;

[0061] The mixing ratio of the halloysite and the sodium hydroxide solution is 14.5 g:110 mL.

[0062] (3) The oxidized carbon nanotubes and the modified halloysite are uniformly dispersed in N,N-dimethylformamide to obtain a mixed dispersion; the mixing ratio of the oxidized carbon nanotubes, the modified halloysite and the N,N-dimethylformamide is 20 g: 3 g: 100 mL.

[0063] (4) Add epichlorohydrin and maleimide to the mixed dispersion obtained above, adjust the temperature to 74°C, keep stirring for 3 hours, and then centrifuge, wash, freeze-dry, crush and grind to obtain modified carbon nanotubes; the mixing ratio of the mixed dispersion, epichlorohydrin and maleimide is 100mL:3.75g:5.28g.

[0064] A method for preparing an aging-resistant centrifugal pump housing coating, comprising:

[0065] First, weigh each raw material according to its weight;

[0066] Add acrylic resin, fluorocarbon resin, dimethyldichlorosilane and hydrogenated rosin glycerol ester to ethyl acetate respectively, stir at 1000r / min for 30min at room temperature, then add silicone oil and modified carbon nanotubes, adjust the speed to 1200r / min, continue stirring for 40min, add titanate coupling agent, adjust the temperature to 75℃, keep stirring for 1 hour to obtain the coating, evenly apply the coating to the surface of the centrifugal pump, and dry it.

[0067] Example 3

[0068] An aging-resistant centrifugal pump housing coating comprises the following components by weight: 64 parts of acrylic resin, 25 parts of fluorocarbon resin, 7 parts of silicone oil, 12 parts of modified carbon nanotubes, 1.5 parts of titanate coupling agent, 0.8 parts of dimethyldichlorosilane, 2 parts of hydrogenated rosin glycerol ester, and 8 parts of ethyl acetate.

[0069] The preparation method of modified carbon nanotubes is as follows:

[0070] (1) adding carbon nanotubes to an oxidizing acid solution, adjusting the temperature to 78° C., stirring and reacting for 30 minutes, then filtering, washing to neutrality, and drying to obtain oxidized carbon nanotubes; the oxidizing acid solution is a mixed solution of nitric acid and sulfuric acid;

[0071] The mass fraction of nitric acid is 4.5%;

[0072] The mass fraction of sulfuric acid is 7.2%;

[0073] The mixing ratio of the carbon nanotubes and the oxidizing acid solution is 11 g:100 mL.

[0074] (2) adding halloysite to an alkaline solution, adjusting the temperature to 62° C., stirring and reacting for 30 min, filtering, washing to neutrality, and drying to obtain modified halloysite; the alkaline solution is a sodium hydroxide solution;

[0075] The concentration of the sodium hydroxide solution is 1.8 mol / L;

[0076] The mixing ratio of the halloysite and the sodium hydroxide solution is 14.5 g:110 mL.

[0077] (3) The oxidized carbon nanotubes and the modified halloysite are uniformly dispersed in N,N-dimethylformamide to obtain a mixed dispersion; the mixing ratio of the oxidized carbon nanotubes, the modified halloysite and the N,N-dimethylformamide is 20 g: 3 g: 100 mL.

[0078] (4) Add epichlorohydrin and maleimide to the mixed dispersion obtained above, adjust the temperature to 74°C, keep stirring for 3 hours, and then centrifuge, wash, freeze-dry, crush and grind to obtain modified carbon nanotubes; the mixing ratio of the mixed dispersion, epichlorohydrin and maleimide is 100mL:3.75g:5.28g.

[0079] A method for preparing an aging-resistant centrifugal pump housing coating, comprising:

[0080] First, weigh each raw material according to its weight;

[0081] Add acrylic resin, fluorocarbon resin, dimethyldichlorosilane and hydrogenated rosin glycerol ester to ethyl acetate respectively, stir at 1000r / min for 30min at room temperature, then add silicone oil and modified carbon nanotubes, adjust the speed to 1200r / min, continue stirring for 40min, add titanate coupling agent, adjust the temperature to 75℃, keep stirring for 1 hour to obtain the coating, evenly apply the coating to the surface of the centrifugal pump, and dry it.

[0082] Example 4

[0083] An aging-resistant centrifugal pump housing coating comprises the following components by weight: 65 parts of acrylic resin, 28 parts of fluorocarbon resin, 8 parts of silicone oil, 15 parts of modified carbon nanotubes, 2 parts of titanate coupling agent, 1 part of dimethyldichlorosilane, 3 parts of hydrogenated rosin glycerol ester, and 70 parts of ethyl acetate.

[0084] The preparation method of modified carbon nanotubes is as follows:

[0085] (1) adding carbon nanotubes to an oxidizing acid solution, adjusting the temperature to 78° C., stirring and reacting for 30 minutes, then filtering, washing to neutrality, and drying to obtain oxidized carbon nanotubes; the oxidizing acid solution is a mixed solution of nitric acid and sulfuric acid;

[0086] The mass fraction of nitric acid is 4.5%;

[0087] The mass fraction of sulfuric acid is 7.2%;

[0088] The mixing ratio of the carbon nanotubes and the oxidizing acid solution is 12 g:100 mL.

[0089] (2) adding halloysite to an alkaline solution, adjusting the temperature to 62° C., stirring and reacting for 30 min, filtering, washing to neutrality, and drying to obtain modified halloysite; the alkaline solution is a sodium hydroxide solution;

[0090] The concentration of the sodium hydroxide solution is 1.8 mol / L;

[0091] The mixing ratio of the halloysite and the sodium hydroxide solution is 14.5 g:110 mL.

[0092] (3) The oxidized carbon nanotubes and the modified halloysite are uniformly dispersed in N,N-dimethylformamide to obtain a mixed dispersion; the mixing ratio of the oxidized carbon nanotubes, the modified halloysite and the N,N-dimethylformamide is 20 g: 3 g: 100 mL.

[0093] (4) Add epichlorohydrin and maleimide to the mixed dispersion obtained above, adjust the temperature to 74°C, keep stirring for 3 hours, and then centrifuge, wash, freeze-dry, crush and grind to obtain modified carbon nanotubes; the mixing ratio of the mixed dispersion, epichlorohydrin and maleimide is 100mL:3.75g:5.28g.

[0094] A method for preparing an aging-resistant centrifugal pump housing coating, comprising:

[0095] First, weigh each raw material according to its weight;

[0096] Add acrylic resin, fluorocarbon resin, dimethyldichlorosilane and hydrogenated rosin glycerol ester to ethyl acetate respectively, stir at 1000r / min for 30min at room temperature, then add silicone oil and modified carbon nanotubes, adjust the speed to 1200r / min, continue stirring for 40min, add titanate coupling agent, adjust the temperature to 75℃, keep stirring for 1 hour to obtain the coating, evenly apply the coating to the surface of the centrifugal pump, and dry it.

[0097] Comparative Example 1

[0098] On the basis of Example 1, no modified carbon nanotubes are added, and the rest of the technical solutions are the same as those of Example 1.

[0099] Comparative Example 2

[0100] On the basis of Example 1, the modified carbon nanotubes are replaced with conventional untreated carbon nanotubes, and the rest of the technical scheme is the same as that of Example 1.

[0101] test

[0102] The samples of the embodiment and the comparative example were uniformly coated on the surface of the 304 steel plate, and after being cured under the same conditions, a coating with a thickness difference of no more than 0.01 mm was formed, and the test was carried out:

[0103] Impact resistance test, refer to MIL-PRF-24667C-2008;

[0104] Table 1

[0105]

[0106]

[0107] It can be seen from Table 1 that the coating prepared by the present invention has excellent impact resistance.

[0108] The elongation at break of the coatings of the examples and comparative examples was tested according to GB / T528-2009:

[0109] Table 2

[0110] Elongation at break % Example 1 165 Example 2 160 Example 3 168 Example 4 161 Comparative Example 1 141 Comparative Example 2 146

[0111] It can be seen from Table 2 that the coating prepared by the present invention has excellent elongation at break.

[0112] Continue the test and carry out the aging test, refer to GB / T23987-2009:

[0113] Table 3

[0114] Coating (1000h) Example 1 No change Example 2 No change Example 3 No change Example 4 No change Comparative Example 1 Cracks in coating

[0115] It can be seen from Table 3 that the coating prepared by the present invention has excellent aging resistance.

[0116] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An aging-resistant centrifugal pump housing coating, characterized in that: By weight The invention comprises the following ingredients: 60-65 parts of acrylic resin, 20-28 parts of fluorocarbon resin, 5-8 parts of silicone oil, 8-15 parts of modified carbon nanotubes, 1-2 parts of coupling agent, 0.5-1 parts of dimethyldichlorosilane, 1-3 parts of hydrogenated rosin glycerol ester, and 60-70 parts of solvent; the preparation method of the modified carbon nanotubes is as follows: (1) adding carbon nanotubes to an oxidizing acid solution, adjusting the temperature to 78°C, stirring and reacting for 30 minutes, then filtering, washing to neutrality, and drying to obtain oxidized carbon nanotubes; (2) adding halloysite to an alkaline solution, adjusting the temperature to 62° C., stirring and reacting for 30 min at the temperature, filtering, washing to neutrality, and drying to obtain modified halloysite; (3) uniformly dispersing the oxidized carbon nanotubes and the modified halloysite in N,N-dimethylformamide to obtain a mixed dispersion; (4) Add epichlorohydrin and maleimide to the mixed dispersion obtained above, adjust the temperature to 74°C, keep warm and stir for 3 hours, and then centrifuge, wash, freeze-dry, crush and grind to obtain modified carbon nanotubes.

2. The aging-resistant centrifugal pump housing coating according to claim 1, characterized in that: The oxidizing acid solution in step (1) is a mixed solution of nitric acid and sulfuric acid; The mass fraction of nitric acid is 4.5%; The mass fraction of sulfuric acid is 7.2%; The mixing ratio of the carbon nanotubes and the oxidizing acid solution is 10-12 g:100 mL.

3. The aging-resistant centrifugal pump housing coating according to claim 1, characterized in that: The alkaline solution in step (2) is a sodium hydroxide solution; The concentration of the sodium hydroxide solution is 1.8 mol / L; The mixing ratio of the halloysite and the sodium hydroxide solution is 14.5 g:110 mL.

4. The aging-resistant centrifugal pump housing coating according to claim 1, characterized in that: The mixing ratio of the oxidized carbon nanotubes, modified halloysite, and N,N-dimethylformamide in step (3) is: 20 g: 3 g: 100 mL.

5. The aging-resistant centrifugal pump housing coating according to claim 1, characterized in that: The mixing ratio of the mixed dispersion, epichlorohydrin and maleimide in step (4) is 100 mL: 3.75 g: 5.28 g.

6. The aging-resistant centrifugal pump housing coating according to claim 1, characterized in that: The silicone oil is: Silicone oil with viscosity below 120cst.

7. The aging-resistant centrifugal pump housing coating according to claim 1, characterized in that: The coupling agent is a titanate coupling agent.

8. The aging-resistant centrifugal pump housing coating according to claim 1, characterized in that: The solvent is ethyl acetate.

9. The method for preparing an aging-resistant centrifugal pump housing coating according to claim 1, characterized in that: include: First, weigh each raw material according to its weight; Add acrylic resin, fluorocarbon resin, dimethyldichlorosilane and hydrogenated rosin glycerol ester to the solvent respectively, stir at 1000r / min for 30min at room temperature, then add silicone oil and modified carbon nanotubes, adjust the speed to 1200r / min, continue stirring for 40min, add coupling agent, adjust the temperature to 75℃, keep stirring for 1 hour to obtain the coating, apply the coating evenly to the surface of the centrifugal pump, and dry it.

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