CN109054640B - Carbon nano tube/liquid paraffin composite coating and preparation method and application thereof - Google Patents
Carbon nano tube/liquid paraffin composite coating and preparation method and application thereof Download PDFInfo
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- CN109054640B CN109054640B CN201810801745.6A CN201810801745A CN109054640B CN 109054640 B CN109054640 B CN 109054640B CN 201810801745 A CN201810801745 A CN 201810801745A CN 109054640 B CN109054640 B CN 109054640B
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- nano tube
- carbon nano
- liquid paraffin
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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
- C09D191/00—Coating compositions based on oils, fats or waxes; Coating compositions based on derivatives thereof
- C09D191/06—Waxes
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
Abstract
The invention relates to a carbon nano tube/liquid paraffin composite coating and a preparation method and application thereof. The composite coating comprises modified carbon nano tubes and liquid paraffin. The preparation method comprises the following steps: preparing modified carbon nano tube, and preparing carbon nano tube/liquid paraffin composite coating. The carbon nano tube/liquid paraffin composite coating has better corrosion resistance in a 3.5 percent NaCl solution of a corrosion medium. Simple preparation process, low cost and no environmental pollution.
Description
Technical Field
The invention belongs to the field of corrosion-resistant coatings and preparation and application thereof, and particularly relates to a carbon nano tube/liquid paraffin composite coating and a preparation method and application thereof.
Background
Corrosion refers to the process of loss and destruction (both metallic and non-metallic) by the surrounding medium (water, air, acids, bases, salts, solvents, etc.). The etching process may be classified into chemical etching and electrochemical etching depending on whether or not current flows during the etching process. The chemical corrosion is an oxidation-reduction reaction between metal and non-conductive gas liquid directly, and no current is generated; electrochemical corrosion is such that when impure metal comes into contact with an electrolyte solution, a galvanic reaction occurs and the more active metal loses electrons and is oxidized. Electrochemical corrosion is the main factor in production and life.
Corrosion phenomena are prevalent in our life and production. The data indicate that about one-off metallic material is directly failed and discarded due to corrosion worldwide. In China, about 1000 million tons of corroded metals cannot be recycled. More seriously, the indirect losses due to corrosion, such as plant shutdowns, material loss, environmental pollution, etc., are much greater than their own impact. The corrosion causes serious harm to national life and social production. Therefore, the corrosion of steel materials is a huge economic problem, and the corrosion protection of steel has always been a significant consideration in practical applications.
The liquid paraffin is a common liquid lubricant, has a certain coating effect, can prevent corrosive particles from contacting with the surface of a metal matrix, and has certain corrosion resistance. But minute etching ions can still penetrate the surface to etch the substrate. It is therefore necessary to add specific additives to the liquid paraffin in order to improve its corrosion resistance in corrosive media.
The carbon nano tube is a one-dimensional nano material with a tubular structure and has extremely high electrical, thermal and mechanical properties. Meanwhile, the paint also has the characteristics of high strength, super-large specific surface area, stable structure and chemical properties and the like, and hardly reacts with various corrosive media. Thus, carbon nanotubes are an excellent anti-corrosion additive.
Disclosure of Invention
The invention aims to solve the technical problem of providing a carbon nano tube/liquid paraffin composite coating and a preparation method and application thereof, so as to overcome the defect of poor corrosion resistance of the coating in the prior art.
The carbon nanotube/liquid paraffin composite coating comprises modified carbon nanotubes and liquid paraffin, wherein the modified carbon nanotubes account for 1-5% of the liquid paraffin by mass.
The modified carbon nanotube is a carbon nanotube modified by a silane coupling agent.
The silane coupling agent is KH 550.
The invention relates to a preparation method of a carbon nano tube/liquid paraffin composite coating, which comprises the following steps:
(1) modifying the carbon nano tube by using a silane coupling agent to obtain a modified carbon nano tube, wherein the ratio of the silane coupling agent to the carbon nano tube is 1-5 mL:0.5 g;
(2) and (2) adding the modified carbon nano tube obtained in the step (1) into liquid paraffin, and performing ultrasonic oscillation to obtain the carbon nano tube/liquid paraffin composite coating, wherein the modified carbon nano tube accounts for 1-5% of the liquid paraffin by mass percent.
The step (1) of modifying the carbon nanotube by using the silane coupling agent specifically comprises the following steps: adding a carbon nano tube into a mixed solution of ethanol and deionized water, carrying out ultrasonic oscillation for 1-5 h, standing for 1h to obtain a carbon nano tube solution, adding a silane coupling agent, carrying out ultrasonic oscillation for 3-6 h, standing for 1h, centrifuging, cleaning and drying, wherein the ratio of the carbon nano tube to the deionized water to the ethanol is 0.5g: 10-50 ml: 100-200 ml.
The centrifugal rotating speed is 4000-6000 r/min; centrifuging and cleaning for 4 times; the drying temperature is 70-90 ℃, and the drying time is 2-6 h.
The silane coupling agent in the step (1) is KH 550.
And (3) the ultrasonic oscillation time in the step (2) is 1-3 h.
The invention relates to an application of a carbon nano tube/liquid paraffin composite coating. Including application to corrosive media in 3.5% NaCl solution.
Advantageous effects
(1) The invention has simple preparation process, low cost and no pollution to the environment.
(2) According to the invention, after the modified carbon nanotube powder is added into the liquid paraffin, the corrosion resistance of the liquid paraffin in a 3.5% NaCl solution as a corrosion medium is improved.
Drawings
Fig. 1 is a Nyquist plot of the resistance of the liquid paraffin paint (1% by mass of modified carbon nanotubes) and the pure liquid paraffin paint (0% by mass of modified carbon nanotubes) coated with the modified carbon nanotubes of example 1.
Fig. 2 is a surface topography of a sample of 304 stainless steel plate coated with the carbon nanotube/liquid paraffin composite coating in example 1.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The various drugs required in the examples of the invention are shown in table 1:
TABLE 1
Example 1
(1) Weighing and adding 200ml of absolute ethyl alcohol and 50ml of deionized water, then adding 0.5g of carbon nano tube, carrying out ultrasonic oscillation for 2 hours, and standing for 1 hour to obtain a carbon nano tube solution. Adding 5mL of coupling agent KH550 into the obtained carbon nano tube solution, carrying out ultrasonic oscillation reaction for 3h, standing for 1h, and carrying out centrifugal separation by using a centrifugal machine, wherein the centrifugal speed is 4000 r/min. Centrifuging for 4 times, and washing with anhydrous ethanol to remove unreacted KH 550; and putting the centrifugal product into a drying oven at 80 ℃ for 2 hours to obtain the modified carbon nano tube.
(2) And (2) adding the modified carbon nano tube obtained in the step (1) into liquid paraffin according to the mass fraction of 1% (taking the liquid paraffin as a base number), and performing dispersion treatment for 2 hours by using an ultrasonic oscillator to obtain the carbon nano tube/liquid paraffin composite coating.
(3) The prepared carbon nano tube/liquid paraffin composite coating is subjected to an anti-corrosion test, which comprises the following steps:
an electrochemical workstation is used for measuring the electrochemical impedance characteristics of the pure liquid paraffin and the liquid paraffin added with the modified carbon nanotube powder, a three-electrode system is adopted, and a 304 stainless steel plate is used as a substrate. The measurement parameter is disturbance potential 5mV, and the frequency range is 10-2～105Hz. The measured electrochemical impedance spectrum is shown in FIG. 1, and the impedance modulus value of pure liquid paraffin at 0.01Hz is 2.73 × 105Omega, and the liquid paraffin containing the modified carbon nanotube powder has an impedance modulus value of 7.3X 10 at 0.01Hz5Omega, the corrosion resistance of the liquid paraffin in 3.5% NaCl solution can be improved by adding the modified carbon nanotube powder.
FIG. 2 shows that: the carbon nano tube subjected to surface modification has better dispersibility in liquid paraffin.
Example 2
(1) Weighing and adding 200ml of absolute ethyl alcohol and 50ml of deionized water, then adding 0.5g of carbon nano tube, carrying out ultrasonic oscillation for 2 hours, and standing for 1 hour to obtain a carbon nano tube solution. Adding 5mL of coupling agent KH550 into the obtained carbon nano tube solution, carrying out ultrasonic oscillation reaction for 4h, standing for 1h, and carrying out centrifugal separation by using a centrifugal machine, wherein the centrifugal speed is 4000 r/min. Centrifuged 4 times and washed with absolute ethanol to remove unreacted KH 550. And putting the centrifugal product into a drying oven at 80 ℃ for 2 hours to obtain the modified carbon nano tube.
(2) And (2) adding the modified carbon nano tube obtained in the step (1) into liquid paraffin according to the mass fraction of 2.5% (taking the liquid paraffin as a base number), and performing dispersion treatment for 1h by using an ultrasonic oscillator to obtain the carbon nano tube/liquid paraffin composite coating.
(3) The prepared carbon nano tube/liquid paraffin composite coating is subjected to an anti-corrosion test, which comprises the following steps:
and measuring the electrochemical impedance characteristics of the pure liquid paraffin and the liquid paraffin added with the modified carbon nanotube powder by using an electrochemical workstation, and adopting a three-electrode system. The measurement parameter is disturbance potential 5mV, and the frequency range is 10-2～105Hz. The impedance modulus value of pure liquid paraffin at 0.01Hz of 2.73 multiplied by 10 is measured by taking a 304 stainless steel plate as a substrate5Omega, and the liquid paraffin containing the modified carbon nanotube powder has an impedance modulus value of 3.7X 10 at 0.01Hz5Omega, the corrosion resistance of the liquid paraffin in 3.5% NaCl solution can be improved by adding the modified carbon nanotube powder.
Example 3
(1) Weighing and adding 200ml of absolute ethyl alcohol and 50ml of deionized water, then adding 0.5g of carbon nano tube, carrying out ultrasonic oscillation for 2 hours, and standing for 1 hour to obtain a carbon nano tube solution. 5mL of coupling agent KH550 is added into the obtained carbon nano tube solution for ultrasonic oscillation reaction for 4h, and the mixture is kept stand for 1 h. Centrifuging for 4 times at 4000r/min by using a centrifuge, cleaning by using absolute ethyl alcohol to remove unreacted KH550, and putting the centrifugal product into a drying oven at 80 ℃ for 2h to obtain the modified carbon nano tube.
(2) And (2) adding the modified carbon nano tube obtained in the step (1) into liquid paraffin in a mass fraction of 5% (taking the liquid paraffin as a base number), and performing dispersion treatment for 1h by using an ultrasonic oscillator to obtain the carbon nano tube/liquid paraffin composite coating.
(3) The prepared carbon nano tube/liquid paraffin composite coating is subjected to an anti-corrosion test, which comprises the following steps:
and measuring the electrochemical impedance characteristics of the pure liquid paraffin and the liquid paraffin added with the modified carbon nanotube powder by using an electrochemical workstation, and adopting a three-electrode system. The measurement parameter is disturbance potential 5mV, and the frequency range is 10-2～105Hz. Using 304 stainless steel plate as base body, measuring to obtain pure liquid stoneThe wax has an impedance modulus value of 2.73 × 10 at 0.01Hz5Omega, and the liquid paraffin containing the modified carbon nanotube powder has an impedance modulus value of 3.5X 10 at 0.01Hz5Omega. The corrosion resistance of the liquid paraffin in 3.5% NaCl solution can be improved by adding the modified carbon nanotube powder.
Claims (5)
1. The carbon nanotube/liquid paraffin composite coating is characterized in that the coating comprises modified carbon nanotubes and liquid paraffin, wherein the modified carbon nanotubes account for 1-5% of the liquid paraffin by mass, and the modified carbon nanotubes are carbon nanotubes modified by a silane coupling agent;
the silane coupling agent is KH 550;
the preparation method of the coating comprises the following steps:
(1) modifying the carbon nano tube by using a silane coupling agent to obtain a modified carbon nano tube, wherein the ratio of the silane coupling agent to the carbon nano tube is 1-5 ml:0.5 g;
(2) adding the modified carbon nano tube obtained in the step (1) into liquid paraffin, and performing ultrasonic oscillation to obtain a carbon nano tube/liquid paraffin composite coating, wherein the modified carbon nano tube accounts for 1-5% of the liquid paraffin by mass;
the step (1) of modifying the carbon nanotube by using the silane coupling agent specifically comprises the following steps: adding a carbon nano tube into a mixed solution of ethanol and deionized water, carrying out ultrasonic oscillation for 1-5 h, standing for 1h to obtain a carbon nano tube solution, adding a silane coupling agent, carrying out ultrasonic oscillation for 3-6 h, standing for 1h, centrifuging, cleaning and drying, wherein the ratio of the carbon nano tube to the deionized water to the ethanol is 0.5g: 10-50 ml: 100-200 ml.
2. A preparation method of a carbon nano tube/liquid paraffin composite coating specifically comprises the following steps:
(1) modifying the carbon nano tube by using a silane coupling agent to obtain a modified carbon nano tube, wherein the ratio of the silane coupling agent to the carbon nano tube is 1-5 ml:0.5g, and the silane coupling agent is KH 550;
(2) adding the modified carbon nano tube obtained in the step (1) into liquid paraffin, and performing ultrasonic oscillation to obtain a carbon nano tube/liquid paraffin composite coating, wherein the modified carbon nano tube accounts for 1-5% of the liquid paraffin by mass;
the step (1) of modifying the carbon nanotube by using the silane coupling agent specifically comprises the following steps: adding a carbon nano tube into a mixed solution of ethanol and deionized water, carrying out ultrasonic oscillation for 1-5 h, standing for 1h to obtain a carbon nano tube solution, adding a silane coupling agent, carrying out ultrasonic oscillation for 3-6 h, standing for 1h, centrifuging, cleaning and drying, wherein the ratio of the carbon nano tube to the deionized water to the ethanol is 0.5g: 10-50 ml: 100-200 ml.
3. The preparation method according to claim 2, wherein the centrifugal rotation speed is 4000 to 6000 r/min; centrifuging and cleaning for 4 times; the drying temperature is 70-90 ℃, and the drying time is 2-6 h.
4. The preparation method according to claim 2, wherein the ultrasonic oscillation time in the step (2) is 1-3 h.
5. Use of the carbon nanotube/liquid paraffin composite coating according to claim 1.
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| CN1386812A (en) * | 2002-05-31 | 2002-12-25 | 东风汽车公司 | Antirust liquid wax for automobile |
| CN103965745A (en) * | 2014-05-13 | 2014-08-06 | 中国科学院宁波材料技术与工程研究所 | Epoxy resin composite coating solution, and preparation method and application method thereof |
| CN104987789A (en) * | 2015-07-03 | 2015-10-21 | 河南科技大学 | High-adhesion wear-resisting, skid-resisting and weather-resisting sport field special coating and preparation method thereof |
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| KR20130063718A (en) * | 2011-12-07 | 2013-06-17 | 충남대학교산학협력단 | Method for manufacturing nanocomposites consisting of carbon and metal using plasma-solution system |
| CN103173125B (en) * | 2013-03-02 | 2016-01-13 | 富莱茵汽车部件有限公司 | A kind of metal rust-proofing wax based on whiteruss and preparation method thereof |
| KR102304350B1 (en) * | 2014-02-14 | 2021-09-17 | 제온 코포레이션 | Secondary-battery porous membrane composition, secondary-battery porous membrane and secondary battery |
| KR101801926B1 (en) * | 2016-04-18 | 2017-11-27 | 한국항공대학교산학협력단 | Method for manufacturing paraffin filled carbon nanotube, nano particles and heat storage |
| CN106010091A (en) * | 2016-05-25 | 2016-10-12 | 中国科学院宁波材料技术与工程研究所 | Anticorrosive and conductive coating and preparation method thereof |
| CN107653024B (en) * | 2017-09-11 | 2020-05-26 | 东华大学 | Preparation method of antifriction and wear-resistant lubricant |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1386812A (en) * | 2002-05-31 | 2002-12-25 | 东风汽车公司 | Antirust liquid wax for automobile |
| CN103965745A (en) * | 2014-05-13 | 2014-08-06 | 中国科学院宁波材料技术与工程研究所 | Epoxy resin composite coating solution, and preparation method and application method thereof |
| CN104987789A (en) * | 2015-07-03 | 2015-10-21 | 河南科技大学 | High-adhesion wear-resisting, skid-resisting and weather-resisting sport field special coating and preparation method thereof |
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