CN110698890A - Inorganic high-temperature-resistant heat-conducting anticorrosive paint and preparation and use methods thereof - Google Patents
Inorganic high-temperature-resistant heat-conducting anticorrosive paint and preparation and use methods thereof Download PDFInfo
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- 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
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- 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
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- C09D5/18—Fireproof paints including high temperature resistant paints
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract
The invention relates to an inorganic high-temperature-resistant heat-conducting anticorrosive coating and a preparation method and a use method thereof, wherein the inorganic high-temperature-resistant heat-conducting anticorrosive coating comprises the following components in percentage by mass: 50-71% of magnesium phosphate cementing material, 1-5.5% of borax, 10-25% of heat-conducting filler, 5-17% of polyimide resin powder, 0.5-1% of defoaming agent and 5-8% of water. The coating disclosed by the invention has good high-temperature resistance and corrosion resistance, is simple in preparation and use methods, and solves the problems of complex preparation process and high cost of inorganic coatings in the prior art.
Description
Technical Field
The invention belongs to the technical field of inorganic coatings, and particularly relates to an inorganic high-temperature-resistant heat-conducting anticorrosive coating and a preparation method and an application method thereof.
Background
At present, many industrial equipment, such as heat exchangers for desulfurization, salt-making heating distillation pipes, tropical solar heat collector pipes, radiators and the like, are in a high-humidity and high-temperature environment for a long time, and are subjected to corrosion of industrial media, acid, alkali and salt mist, which seriously affects the service efficiency and service life of the equipment, so that the corrosion prevention treatment of the industrial equipment is needed. At present, the conventional methods for corrosion prevention mainly comprise two methods, one method is to manufacture equipment by adopting high-temperature-resistant and corrosion-resistant materials, but most of the materials are expensive, and the cost of enterprises is increased by using a large amount of the materials. The other is to coat an anti-corrosion coating on the surface of the equipment to protect the equipment workpiece, and most of the existing high-temperature-resistant and anti-corrosion coatings are mainly organic coatings, have long surface drying time (1-2h) and high curing temperature (over 180 ℃), have the problem of high energy consumption in the actual use process, and can cause certain environmental pollution. In addition, the paint film of the paint has poor temperature resistance, and is difficult to keep stable at the high temperature of 350 ℃ for a long time, so that the paint film has the phenomena of peeling, cracking and falling in the using process, the surface of equipment is corroded when being contacted with corrosive and oxidative environments, and the service life of equipment workpieces is further shortened. In addition, in the actual production process, in order to improve the reliability of corrosion resistance, the film thickness of the coating is thick, so that the thermal resistance effect is improved, and the heat exchange of equipment is not facilitated. The inorganic coating is suitable for corrosion prevention of equipment parts at high temperature due to its high-temperature stability. The existing inorganic high-temperature resistant heat-conducting anticorrosive coatings mostly mainly comprise ceramic coatings, for example, "high-heat-conducting anticorrosive ceramic coating for metal heat exchanger and preparation method and application thereof" (patent application No. 201611109914.7), "high-temperature resistant anti-oxidation high-emissivity coating and use method thereof" (patent application No. 201510668003.7), "low-temperature sintering high-heat-conducting ceramic coating suitable for metal substrate and preparation method and application thereof" (patent application No. 201611109913.2), "high-temperature resistant corrosion-resistant coating and preparation method thereof" (patent application No. 201811119576.4). The inorganic coating described in the above patent has a complicated preparation process, a high forming temperature, and needs to be sintered before use, which is complicated to use and has a high cost.
Disclosure of Invention
The technical problem solved by the invention is as follows: the inorganic high-temperature-resistant heat-conducting anticorrosive coating has good high-temperature resistance and corrosion resistance, and the preparation and use methods are simple, so that the problems of complex preparation process and high cost of the inorganic coating in the prior art are solved.
The specific solution provided by the invention comprises the following steps:
the invention provides an inorganic high-temperature-resistant heat-conducting anticorrosive coating which comprises the following components in percentage by mass: 50-71% of magnesium phosphate cementing material, 1-5.5% of borax, 10-25% of heat-conducting filler, 5-17% of polyimide resin powder, 0.5-1% of defoaming agent and 5-8% of water.
The beneficial effect who adopts above-mentioned scheme does:
(1) the inorganic high-temperature-resistant heat-conducting anticorrosive coating disclosed by the invention takes the magnesium phosphate binding material as the base material, and the binding material has the characteristics of small drying shrinkage, high adaptability with the base material, strong bonding property and the like, so that the coating can be firmly combined with the base material and is not easy to fall off and crack. In addition, the magnesium phosphate cementing material has a compact structure and intrinsic high-temperature stability, and forms a compact coating film layer on the surface of a base material together with borax, a heat-conducting filler and Polyimide (PI) resin powder, so that the film layer also has high strength, high durability and high-temperature stability, and can resist high temperature of more than 600 ℃ for a long time.
(2) The PI resin added in the invention is thermosetting resin, when the coating is used under a high-temperature condition, the coating has an excellent bonding effect, and when the coating is used, the PI resin is cured in the magnesium phosphate binding material to promote the PI resin to be further bonded with other materials to form a compact coating; the PI resin has good high-temperature stability and acid corrosion resistance, and has a synergistic effect with a magnesium phosphate binding material matrix, so that the coating has good high-temperature resistance and acid corrosion resistance. The coating based on the invention has high strength, firm combination with a substrate, high temperature resistance and corrosion resistance.
Specifically, the magnesium phosphate gel material is a magnesium-phosphate complex hydrated gel formed by the reaction of MgO, water and phosphate, and has a hardened body structure with MgO particles as a core and a phosphate hydrated product as a binder phase, and the structure enables the gel material to have high strength and high cohesiveness. In addition, the cementing material also has high-temperature stability.
Further, the heat conducting filler is selected from any one or more of silicon carbide, graphene, graphite flakes, carbon fibers, carbon nanotubes and boron nitride.
The heat-conducting filler disclosed by the invention has a high heat conductivity coefficient, can enhance the heat dissipation efficiency of equipment workpieces, reduce the thermal resistance effect of the workpieces and promote the heat exchange of the workpieces, has good acid-base corrosion resistance, can further improve the acid-base corrosion resistance of the coating, and also increases the flexibility of the coating to a certain extent by adding the heat-conducting filler, so that the coating is not easy to crack.
The invention also provides a preparation method of the inorganic high-temperature-resistant heat-conducting anticorrosive coating, which comprises the following steps:
s1, preparing the following raw materials in percentage by mass: 25-35% of dihydric phosphate, 15-30% of over-sintered magnesium oxide, 12-18% of water, 1-5.5% of borax, 10-25% of heat-conducting filler, 5-17% of polyimide resin powder and 0.5-1% of defoaming agent;
s2, mixing and grinding the dihydric phosphate prepared in the step S1, the over-sintered magnesium oxide, the borax, the heat-conducting filler and the polyimide resin powder to obtain a mixed ingredient;
and S3, adding the defoaming agent and the water prepared in the step S1 into the mixed ingredients, and uniformly stirring to obtain the high-temperature-resistant heat-conducting anticorrosive paint.
The inorganic high-temperature-resistant heat-conducting anticorrosive coating provided by the invention has the advantages that the raw materials are easy to obtain, the coating can be prepared at normal temperature, namely, the components are stirred by adding water on site during specific preparation, the production process is simple, the cost is low, the coating is green and environment-friendly, and the industrial production is easy to realize.
Further, the dihydric phosphate is selected from any one or more of aluminum dihydrogen phosphate, potassium dihydrogen phosphate, sodium dihydrogen phosphate and calcium dihydrogen phosphate.
In particular, when phosphorusThe acid salt quickly ionizes when dissolved in water to produce H+And a polybasic phosphate ion while reacting MgO with water to form Mg (OH)2Hydrogen ions and OH generated by ionization-Neutralization reaction takes place, free Mg2+Forming magnesium-phosphate complex hydrated gel with phosphate particles, and finally forming a hardened body structure taking MgO particles as a core and taking a phosphate hydrated product as a binder phase. Therefore, after water is added into the mixed ingredients, the dihydric phosphate in the ingredients and the over-burnt magnesium oxide (MgO) react in the water to generate the magnesium phosphate gel material, and finally the coating taking the magnesium phosphate gel material as a main matrix is obtained.
In particular, the defoamer is selected from German Pick chemical polymer type defoamers.
The defoaming agent can effectively remove bubbles generated in the reaction of dihydric phosphate and magnesium oxide, and eliminate bubbles generated in the later ball milling process, so that the coating is compact in interior and smooth in surface.
Further, the over-burnt magnesia is obtained by calcining commercial over-burnt magnesia for 2-4 hours at the temperature of more than or equal to 1600 ℃, and the mass percentage of MgO in the commercial over-burnt magnesia is more than or equal to 85 percent.
The magnesium phosphate cementing material is prepared by adopting the over-burnt magnesium oxide treated by high-temperature calcination, so that the hydration rate of MgO can be slowed down, and the later-stage coating construction of the coating is facilitated; in addition, the calcined over-sintered magnesium oxide has a smaller internal specific surface area, the density of the coating after film formation is increased, corrosive media can be effectively prevented from entering the interior of the coating and contacting with a substrate, and the corrosion resistance of the coating is further improved.
Further, the particle size of the polyimide resin is less than or equal to 5 microns, the particle size of the heat-conducting filler is 0.05-0.8 microns, and the particle size of the over-sintered magnesium oxide is 0.1-10 microns.
Therefore, the raw material powder adopted by the invention is the superfine powder, so that the surface energy of the coating can be effectively reduced, and the coating and the base material are tightly combined in a mechanical, physical and chemical mode. In addition, the coating can be densely formed on the surface of the coating, and plays a role in filling and compacting in the coating, so that a corrosive medium is prevented from entering the coating and contacting with a substrate, and an anti-corrosion effect is effectively achieved.
Further, the mixed powder is obtained in the S2 by adopting a ball milling mode, the ball milling speed is 200-600rpm, and the ball milling time is 0.5-10 h.
From this, carry out the ball-milling after the mixing, when the ball-milling further levitates the reactant granularity, also make its intensive mixing, each other intensive contact to promote the reactivity of raw materials, also make its intensive mixing, each other intensive contact, thereby promoted the reactivity of raw materials.
The invention also provides a using method of the inorganic high-temperature-resistant heat-conducting anticorrosive coating, which is characterized in that the coating is coated on the surface of a substrate and is kept stand for 24-48h at the temperature of 20-28 ℃.
Therefore, the coating is coated on the surfaces of industrial equipment and devices, so that the devices with high-temperature resistance, corrosion resistance and heat conductivity are obtained, and the service lives of the equipment and the devices are prolonged.
Specifically, the coating is sprayed on the surface of the base material in a dip coating, roll coating or spraying manner, and the base material coated with the inorganic high-temperature-resistant heat-conducting anticorrosive coating is obtained after standing for 24-48 hours at the temperature of 20-28 ℃.
Therefore, after the surfaces of industrial equipment and devices are coated with the inorganic high-temperature-resistant heat-conducting anticorrosive coating, the coating can be put into use after standing and drying at normal temperature, and the process is simple.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow chart of the preparation of the inorganic high temperature resistant heat-conducting anticorrosive coating based on the method of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Example 1
S1, preparing the following raw materials in percentage by mass: 30% of dihydric phosphate, 25% of over-fired magnesium oxide, 13% of water, 4.5% of borax, 17% of carbon fiber, 10% of polyimide resin powder and 0.5% of defoaming agent.
S2, mixing and grinding the dihydric phosphate, the over-sintered magnesium oxide, the borax, the heat-conducting filler and the polyimide resin powder to obtain a mixed ingredient;
and S3, adding a defoaming agent and water into the mixed ingredients, and uniformly stirring to obtain the high-temperature-resistant heat-conducting anticorrosive coating.
Example 2
S1, preparing the following raw materials in percentage by mass: 28% of dihydric phosphate, 15% of over-fired magnesium oxide, 12% of water, 2.5% of borax, 25% of silicon carbide, 17% of polyimide resin powder and 0.5% of defoaming agent;
s2, mixing and ball-milling the dihydric phosphate, the over-sintered magnesium oxide, the borax, the heat-conducting filler and the polyimide resin powder to obtain a mixed ingredient;
and S3, adding a defoaming agent and water into the mixed ingredients, and uniformly stirring to obtain the high-temperature-resistant heat-conducting anticorrosive coating.
Example 3
Similar to example 1, except that:
s1, preparing the following raw materials in percentage by mass: 25% of dihydric phosphate, 30% of calcined magnesium oxide, 12% of water, 5.5% of borax, 10% of graphene, 17% of polyimide resin powder and 0.5% of defoaming agent.
Example 4
Similar to example 1, except that:
s1, preparing the following raw materials in percentage by mass: 35% of dihydric phosphate, 25% of over-fired magnesium oxide, 18% of water, 1% of borax, 15% of graphene, 5% of polyimide resin powder and 1% of defoaming agent.
Comparative example 1
Similar to example 1, except that the raw materials contained no heat conductive filler, the other raw materials were added in the same amounts as in example 1.
Comparative example 2
Similar to example 1, except that the raw materials do not contain polyimide resin powder, the other raw materials are added in the same amount as in example 1.
The high-temperature-resistant heat-conducting anticorrosive coatings obtained in examples 1-4 and comparative examples 1-2 are respectively coated on the surface of a tinplate, and then the acid corrosion resistance, the alkali corrosion resistance, the high-temperature resistance and the heat-conducting property of the tinplate are respectively tested; specifically, when the heat conductivity is tested, the coating on the tinplate is peeled off, and the heat conductivity is measured on a C-THERM TCI type heat conductivity measuring instrument, and the test results are shown in table 1:
table 1:
as can be seen from examples 1 to 4 and comparative examples 1 to 2, the heat conductive filler and the PI resin have significant effects on the heat conductive performance and the high temperature and corrosion resistance of the material. Test results show that the coating disclosed by the invention has good heat-conducting property; high temperature resistance, no cracking, bubbling and shedding after calcining for 1000h at 600 ℃; acid resistance (10% H)2SO4) No bubbling and falling off after 300 hours; the coating has no bubbling and shedding in an alkali-resistant (5% NaOH) solution for 300 hours, and can effectively delay the acid-base corrosion.
According to the coating prepared by the method, the raw materials are mixed at normal temperature, sintering is not needed, and the preparation is simple; the coating is firmly combined with a substrate, has excellent high-temperature resistance, and is not easy to generate the problems of foaming, falling off, cracking, even delamination and the like under the high-temperature condition; the acid and alkali corrosion resistance is excellent, and parts coated with the coating can be used in severe environment.
Although embodiments of the present invention have been described in detail above, those of ordinary skill in the art will understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. The inorganic high-temperature-resistant heat-conducting anticorrosive coating is characterized by comprising the following components in percentage by mass: 50-71% of magnesium phosphate cementing material, 1-5.5% of borax, 10-25% of heat-conducting filler, 5-17% of polyimide resin powder, 0.5-1% of defoaming agent and 5-8% of water.
2. The inorganic high-temperature-resistant heat-conducting anticorrosive paint according to claim 1, wherein the heat-conducting filler is selected from any one or more of silicon carbide, graphene, graphite flakes, carbon fibers, carbon nanotubes and boron nitride.
3. The preparation method of the inorganic high-temperature-resistant heat-conducting anticorrosive paint as claimed in claim 1 or 2, characterized by comprising the following steps:
s1, preparing the following raw materials in percentage by mass: 25-35% of dihydric phosphate, 15-30% of over-sintered magnesium oxide, 12-18% of water, 1-5.5% of borax, 10-25% of heat-conducting filler, 5-17% of polyimide resin powder and 0.5-1% of defoaming agent;
s2, mixing and grinding the dihydric phosphate prepared in the step S1, the over-sintered magnesium oxide, the borax, the heat-conducting filler and the polyimide resin powder to obtain a mixed ingredient;
and S3, adding the defoaming agent and the water prepared in the step S1 into the mixed ingredients, and uniformly stirring to obtain the high-temperature-resistant heat-conducting anticorrosive paint.
4. The method for preparing the inorganic high-temperature-resistant heat-conducting anticorrosive paint according to claim 3, wherein the dihydrogen phosphate is one or more selected from aluminum dihydrogen phosphate, potassium dihydrogen phosphate, sodium dihydrogen phosphate and calcium dihydrogen phosphate.
5. The preparation method of the inorganic high-temperature-resistant heat-conducting anticorrosive coating as claimed in claim 3, wherein the over-burnt magnesia is obtained by calcining commercial over-burnt magnesia at a temperature of not less than 1600 ℃ for 2-4h, and the mass percentage of MgO in the commercial over-burnt magnesia is not less than 85%.
6. The preparation method of the inorganic high-temperature-resistant heat-conducting anticorrosive coating as claimed in claim 3, wherein the particle size of the polyimide resin is not more than 5 μm, the particle size of the heat-conducting filler is 0.05-0.8 μm, and the particle size of the calcined magnesia is 0.1-10 μm.
7. The preparation method of the inorganic high-temperature-resistant heat-conducting anticorrosive coating as claimed in claim 3, wherein the powder mixture obtained in S2 is subjected to ball milling at a speed of 200-600rpm for 0.5-10 h.
8. The use method of the inorganic high-temperature-resistant heat-conducting anticorrosive paint as claimed in claim 1 or 2, characterized in that the paint is coated on the surface of a substrate and is left standing for 24-48h at 20-28 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112876199A (en) * | 2021-02-03 | 2021-06-01 | 中铁西南科学研究院有限公司 | Novel adhesive for sound-absorbing spraying material |
| CN117887292A (en) * | 2023-12-19 | 2024-04-16 | 苏州苏净安发环境科技有限公司 | Environment cabinet shell surface treatment process and application thereof in intelligent manufacturing |
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| CN112876199A (en) * | 2021-02-03 | 2021-06-01 | 中铁西南科学研究院有限公司 | Novel adhesive for sound-absorbing spraying material |
| CN117887292A (en) * | 2023-12-19 | 2024-04-16 | 苏州苏净安发环境科技有限公司 | Environment cabinet shell surface treatment process and application thereof in intelligent manufacturing |
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Application publication date: 20200117 |