CN114672244A - Organic-inorganic hybrid high-temperature-resistant anti-oxidation coating and preparation method thereof - Google Patents
Organic-inorganic hybrid high-temperature-resistant anti-oxidation coating and preparation method thereof Download PDFInfo
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- CN114672244A CN114672244A CN202210199403.8A CN202210199403A CN114672244A CN 114672244 A CN114672244 A CN 114672244A CN 202210199403 A CN202210199403 A CN 202210199403A CN 114672244 A CN114672244 A CN 114672244A
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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
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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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
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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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
- C09D5/18—Fireproof paints including high temperature resistant paints
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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
Abstract
The invention relates to an organic-inorganic hybrid high-temperature-resistant anti-oxidation coating and a preparation method thereof, and the organic-inorganic hybrid high-temperature-resistant anti-oxidation coating mainly comprises the following components in parts by mass: 20-25 parts of water, 0.4-0.6 part of bentonite, 0.4-0.6 part of water-based dispersant, 0.3-0.5 part of water-based wetting agent, 0.4-0.5 part of water-based defoamer, 0.2-0.4 part of stabilizer, 2-5 parts of copper-chromium black, 3-6 parts of talcum powder, 2-5 parts of mica powder, 4-8 parts of silica powder, 25-40 parts of organic silicon emulsion and 15-25 parts of silica sol. The inorganic silica sol is introduced into the prepared high-temperature resistant coating on the basis of the organic high-temperature resistant coating, so that the use amount of the organic silicon emulsion can be reduced, the volatilization of organic substances in the high-temperature process is reduced, and the environment friendliness of the product is improved.
Description
Technical Field
The invention relates to an organic-inorganic hybrid high-temperature-resistant anti-oxidation coating and a preparation method thereof.
Background
The metal is easily oxidized with water vapor and oxygen-containing gas during the high-temperature calcination to cause oxidation corrosion, which adversely affects the service life of the metal product and the safety of the apparatus in a high-temperature use environment. At present, a common countermeasure is to coat a layer of high-temperature-resistant anti-oxidation coating on the surface of metal, so as to improve the service life and the safety of the metal. The high-temperature resistant coating can be divided into an organic silicon high-temperature resistant coating and an inorganic silicon high-temperature resistant coating. Wherein the organic silicon high-temperature resistant coating is widely applied to high-temperature facilities such as industrial kilns, steam pipelines, chimneys and the like. The main chain of the organic silicon coating is composed of Si-O-Si, the side chain is provided with an organic group, and the side chain is easier to break than a silicon-oxygen bond of the main chain under a high-temperature environment, so that the organic silicon coating has a better high-temperature resistant effect, but the thermal stability temperature resistant range of the organic silicon coating is generally between 100 ℃ and 500 ℃, and the silicon-oxygen bond of the main chain can break at a higher temperature, so that the high-temperature anti-oxidation effect is gradually lost. The inorganic silicon high-temperature resistant coating is widely applied to the industrial fields of metallurgy, petroleum industry, natural gas exploitation, aerospace and the like, the film forming material is mainly silicate, the source is rich, a water-based solvent is mostly adopted, no volatile substance is generated at high temperature and normal temperature, and the inorganic silicon high-temperature resistant coating is an environment-friendly coating. However, the inorganic high-temperature resistant coating has insufficient adhesive force and paint film toughness, and the paint film is easy to crack and fall off at high temperature and in the cold-hot circulation process.
In order to improve the adhesive force and the flexibility of a paint film, a part of organic silicon emulsion needs to be compounded, organic groups in organic silicon volatilize in the high-temperature treatment process, and compared with a pure inorganic coating, the environment-friendly grade is reduced.
Disclosure of Invention
The invention provides an organic-inorganic hybrid high-temperature-resistant anti-oxidation coating and a preparation method thereof, the coating can overcome the defects of organic and inorganic high-temperature-resistant coatings, simultaneously takes the advantages of the organic and inorganic high-temperature-resistant coatings into consideration, improves the temperature resistance of an organic silicon coating, enhances the adhesive force of the inorganic silicon coating and the flexibility of a paint film, enables a steel plate to be processed at 800 ℃ for more than 6 hours without being corroded by high temperature, and the paint film still can not crack or fall off after cold and hot impact.
The invention is realized by the following technical scheme:
an organic-inorganic hybrid high-temperature-resistant anti-oxidation coating mainly comprises the following components in parts by mass:
the talcum powder adopts 1250-mesh talcum powder.
The mica powder is 800 meshes of mica powder.
Wherein the water is common tap water;
bentonite purchased from Nanjing Haimines;
dispersants, wetting agents, defoamers, and stabilizers were purchased from dow chemistry;
talcum powder is purchased from Guangfu;
The copper-chromium black is purchased from a novel Buddha mindset material;
wollastonite is purchased from Jiangxi Kong extra fine powder company;
the silicon micropowder is purchased from lotus leaf chemical industry
Mica powder is purchased from Jiangxi Guangyuan
Silicone emulsions and silica sols are purchased from uda chemical.
A preparation method of an organic-inorganic hybrid high-temperature-resistant anti-oxidation coating comprises the following steps:
s1, sequentially adding water, bentonite, a water-based dispersing agent, a water-based wetting agent and a water-based defoaming agent into a container at a rotating speed of less than 600rpm, and stirring for 1-3 minutes until the bentonite is obviously thickened;
s2, then adding silica sol and a stabilizer, and stirring for 2-5min until the materials are uniformly dispersed and transparent;
s3, adding copper-chromium black, talcum powder, mica powder and silicon micro powder, increasing the rotating speed to 1200-1500rpm, and dispersing for 15-20min until the powder is uniformly dispersed in the system;
and S4, regulating the rotating speed to be below 500rpm, adding the organic silicon emulsion and the rest defoaming agent, and continuously stirring for 5-10min to obtain the organic-inorganic hybrid high-temperature-resistant anti-oxidation coating.
The high-temperature-resistant coating is prepared by an organic silicon and inorganic silicon hybridization method, can overcome the defects of organic and inorganic high-temperature-resistant coatings, simultaneously takes the advantages of the organic and inorganic high-temperature-resistant coatings into consideration, can be treated at 800 ℃ for more than 6 hours, and still can not crack or fall off after cold and hot impact.
The principle is as follows: 1. by using organic silicon emulsion and inorganic silica sol as film forming matter, talcum powder, wollastonite and silica powder as main high temperature resisting stuffing. In the processes of high-temperature calcination and cold and hot impact, the organic groups are broken, so that the internal stress of the paint film can be effectively eliminated, the adhesive force and toughness of the paint film in the processes of high-temperature treatment and cold and hot circulation are improved, and the paint film can achieve the effects of no cracking and no falling.
2. By using the organic silicon emulsion and the inorganic silica sol as film forming substances, and the existence of the inorganic film forming substances and the hybridization of the organic film forming substances and the inorganic film forming substances, the temperature resistance of the organic silicon coating can be improved, the problem of poor temperature resistance of the organic silicon coating is solved, the high temperature resistance of a paint film is effectively improved, a steel plate is not corroded by high temperature after being treated at 800 ℃ for 6 hours, the adhesive force of the inorganic silicon coating and the flexibility of the paint film are enhanced, and the paint film can not crack or fall off in the cold and hot shock process. Meanwhile, the volatilization amount of organic substances in the high-temperature treatment process can be reduced, and the environmental protection property of the coating is improved.
Compared with the prior art, the invention has the following beneficial effects:
1. The inorganic silica sol is introduced into the prepared high-temperature resistant coating on the basis of the organic high-temperature resistant coating, so that the use amount of the organic silicon emulsion can be reduced, the volatilization of organic substances in the high-temperature process is reduced, and the environment friendliness of the product is improved.
2. The organic-inorganic hybrid mode is adopted to prepare the high-temperature-resistant coating, so that the advantages of the organic-inorganic hybrid mode and the high-temperature-resistant coating can be considered, the problems that the high-temperature resistance of the organic high-temperature-resistant coating is insufficient, the toughness of a paint film of the inorganic high-temperature-resistant coating is insufficient, and the inorganic high-temperature-resistant coating is easy to fall off due to cold and hot impact are solved.
Detailed description of the preferred embodiments
Example 1
Adjusting the rotating speed to 300rpm, adding 25 parts of water, 0.4 part of bentonite, 0.6 part of water-based dispersant, 0.3 part of water-based wetting agent and 0.3 part of water-based defoaming agent, and stirring for 3min until the bentonite is obviously thickened;
adding 25 parts of silica sol and 0.2 part of stabilizer, and stirring for 5min until the materials are uniformly dispersed and transparent;
then adding 2 parts of copper-chromium black, 3 parts of talcum powder, 5 parts of wollastonite, 8 parts of silicon micropowder and 2 parts of mica powder, increasing the rotating speed to 1500rpm, and dispersing for 15min until the powder is uniformly dispersed in the system;
regulating the rotating speed to 500rpm, sequentially adding 25 parts of organic silicon emulsion and 0.2 part of water-based defoaming agent, and continuously stirring for 5-10min to obtain a finished product.
Example 2
Adjusting the rotating speed to 300rpm, adding 23 parts of water, 0.5 part of bentonite, 0.4 part of water-based dispersant, 0.3 part of water-based wetting agent and 0.3 part of water-based defoaming agent, and stirring for 3min until the bentonite is obviously thickened;
Adding 20 parts of silica sol and 0.3 part of stabilizer, and stirring for 5min until the materials are uniformly dispersed and transparent;
then adding 4 parts of copper-chromium black, 5 parts of talcum powder, 3 parts of wollastonite, 6 parts of silicon micropowder and 5 parts of mica powder, increasing the rotating speed to 1500rpm, and dispersing for 15min until the powder is uniformly dispersed in the system;
regulating the rotating speed to 500rpm, sequentially adding 32 parts of organic silicon emulsion and 0.2 part of defoaming agent, and continuously stirring for 5-10min to obtain a finished product.
Example 3
Adjusting the rotating speed to 300rpm, adding 20 parts of water, 0.6 part of bentonite, 0.5 part of water-based dispersant, 0.5 part of water-based wetting agent and 0.2 part of water-based defoamer, and stirring for 3min until the bentonite is obviously thickened;
adding 15 parts of silica sol and 0.4 part of stabilizer, and stirring for 5min until the materials are uniformly dispersed and transparent;
then adding 5 parts of copper-chromium black, 6 parts of talcum powder, 7 parts of wollastonite, 4 parts of silicon micropowder and 3 parts of mica powder, increasing the rotating speed to 1500rpm, and dispersing for 15min until the powder is uniformly dispersed in the system;
regulating the rotating speed to 500rpm, sequentially adding 40 parts of organic silicon emulsion and 0.2 part of water-based defoaming agent, and continuously stirring for 5-10min to obtain a finished product.
Comparative example 1 (without silica sol)
Adjusting the rotating speed to 300rpm, adding 25 parts of water, 0.4 part of bentonite, 0.6 part of water-based dispersant, 0.3 part of water-based wetting agent, 0.3 part of water-based defoaming agent and 0.2 part of stabilizer, and stirring for 3min until the bentonite is obviously thickened;
Then adding 5 parts of copper-chromium black, 4 parts of talcum powder, 4 parts of wollastonite, 6 parts of silicon micropowder and 4 parts of mica powder, increasing the rotating speed to 1500rpm, and dispersing for 15min until the powder is uniformly dispersed in the system;
regulating the rotating speed to 500rpm, sequentially adding 50 parts of organic silicon emulsion and 0.2 part of defoaming agent, and continuously stirring for 5-10min to obtain a finished product.
Comparative example 2 (without silicone emulsion)
Adjusting the rotating speed to 300rpm, adding 25 parts of water, 0.6 part of bentonite, 0.4 part of water-based dispersant, 0.4 part of water-based wetting agent and 0.2 part of water-based defoamer, and stirring for 3min until the bentonite is obviously thickened;
adding 50 parts of silica sol and 0.2 part of stabilizing agent, and stirring for 5min until the materials are uniformly dispersed and transparent;
then adding 2 parts of copper-chromium black, 5 parts of talcum powder, 6 parts of wollastonite, 8 parts of silicon micropowder and 2 parts of mica powder, increasing the rotating speed to 1500rpm, and dispersing for 15min until the powder is uniformly dispersed in the system;
regulating the rotating speed to 500rpm, adding 0.2 part of defoaming agent, and continuously stirring for 5-10min to obtain a finished product.
The comparative examples 1 and 2 are that no organic silicon emulsion or no inorganic silica sol is added, and the results show that the high temperature resistance of the organic silicon coating without silica sol is obviously insufficient, the silicon-oxygen bond of the main chain of a paint film is broken at 800 ℃, and the paint film structure is damaged; the inorganic coating without the organic silicon emulsion has insufficient toughness and adhesive force at 800 ℃, and can crack and partially fall off.
The performance of the examples of the invention is compared with that of the comparative examples, a sand blasting steel plate is used in the high temperature resistance test, the test temperature is 800 ℃, the steel plate is soaked in cold water after being calcined for 6 hours, and the state of a paint film is observed. The stability of the finished paint was determined by standing at 50 ℃ for one month and the data obtained from the tests are given in table 1 below. According to the invention, organic silicon and inorganic silicon are main film forming substances, and in the high-temperature calcination process, the internal stress of a paint film can be effectively eliminated by the breakage of organic groups, so that the adhesive force and toughness of the paint film in the high-temperature treatment and cold-heat circulation processes are improved, and the high-temperature resistance of the paint film can be further improved by the existence of the inorganic film forming substances. The added copper chromium black is used for improving the covering power of a paint film; the wollastonite is present for further improving the toughness of the paint film; the talcum powder and the silicon micropowder exist as common high-temperature-resistant fillers, and do not produce the effects of gain and loss on high-temperature resistance; the small amount of mica powder is added to facilitate the flaky structure of the mica powder to reduce the water diversion problem in the heat storage process, and the mica powder does not have the gain and loss effects on the high temperature resistance.
TABLE 1 comparison of the performance of the organic-inorganic hybrid high-temperature-resistant and anti-oxidation coating of the present invention with that of the comparative example
Claims (5)
1. An organic-inorganic hybrid high-temperature-resistant anti-oxidation coating is characterized in that: the adhesive mainly comprises the following components in parts by mass:
2. the organic-inorganic hybrid high-temperature-resistant and oxidation-resistant coating as claimed in claim 1, wherein: the talcum powder adopts 1250-mesh talcum powder.
3. The organic-inorganic hybrid high-temperature-resistant oxidation-resistant coating as claimed in claim 1, wherein: the mica powder is 800 meshes of mica powder.
4. The organic-inorganic hybrid high-temperature-resistant oxidation-resistant coating as claimed in claim 1, wherein: the water is common tap water.
5. A preparation method of an organic-inorganic hybrid high-temperature-resistant anti-oxidation coating is characterized by comprising the following steps: the method comprises the following steps:
at the rotating speed of less than 600rpm, sequentially adding water, bentonite, a water-based dispersing agent, a water-based wetting agent and part of water-based defoaming agent into a container, and stirring for 1-3 minutes until the bentonite is obviously thickened;
then adding silica sol and a stabilizer, and stirring for 2-5min until the materials are uniformly dispersed and transparent;
then adding copper-chromium black, talcum powder, mica powder and silicon micropowder, increasing the rotating speed to 1200-1500rpm, and dispersing for 15-20min until the powder is uniformly dispersed in the system;
Regulating the rotating speed to be below 500rpm, then adding the organic silicon emulsion and the rest defoaming agent, and continuously stirring for 5-10min to obtain the organic-inorganic hybrid high-temperature-resistant anti-oxidation coating.
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| CN101117502A (en) * | 2007-08-22 | 2008-02-06 | 中国化工建设总公司常州涂料化工研究院 | Environment friendly type self-crosslinking water woodware paint |
| CN101544855A (en) * | 2009-04-24 | 2009-09-30 | 景德镇陶瓷学院 | Environmental protecting multifunctional coating and its preparing method |
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| CN104927642A (en) * | 2015-06-11 | 2015-09-23 | 合肥和安机械制造有限公司 | Anti-thermal-oxidized composite water-soluble organic silicon resin coating for exhaust pipe of forklift engine and preparation method thereof |
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| CN105713471A (en) * | 2016-03-16 | 2016-06-29 | 陈威 | Waterborne inorganic building closed alkali-resistant primer formula and preparation technology |
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2022
- 2022-03-02 CN CN202210199403.8A patent/CN114672244A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101117502A (en) * | 2007-08-22 | 2008-02-06 | 中国化工建设总公司常州涂料化工研究院 | Environment friendly type self-crosslinking water woodware paint |
| CN101544855A (en) * | 2009-04-24 | 2009-09-30 | 景德镇陶瓷学院 | Environmental protecting multifunctional coating and its preparing method |
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| CN104927642A (en) * | 2015-06-11 | 2015-09-23 | 合肥和安机械制造有限公司 | Anti-thermal-oxidized composite water-soluble organic silicon resin coating for exhaust pipe of forklift engine and preparation method thereof |
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