CN111154301B - Inorganic high-temperature marking paint - Google Patents
Inorganic high-temperature marking paint Download PDFInfo
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- CN111154301B CN111154301B CN202010058406.0A CN202010058406A CN111154301B CN 111154301 B CN111154301 B CN 111154301B CN 202010058406 A CN202010058406 A CN 202010058406A CN 111154301 B CN111154301 B CN 111154301B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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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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Abstract
The invention discloses an inorganic high-temperature marking paint which comprises the following raw materials in parts by weight: 15-25 parts of titanium dioxide, 8-15 parts of superfine aluminum hydroxide, 5-8 parts of nano silicon dioxide, 3-5 parts of nano pseudo-boehmite, 0.1-0.3 part of silane coupling agent, 0.1-0.2 part of dispersing auxiliary agent, 0.1 part of hydrochloric acid and 0.5 part of ammonia water. The invention also discloses a preparation method of the inorganic high-temperature mark coating, which comprises the following steps: modifying the nano silicon dioxide, preparing alkaline stable gel by using the nano pseudo-boehmite, mixing the alkaline stable gel and the gel, adding deionized water and the rest other raw materials, mixing and grinding to obtain the coating. The coating prepared by the method has good adhesive force at high temperature, short curing time, nearly neutral property, no corrosion to steel base materials and suitability for outdoor severe weather.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to an inorganic high-temperature marking coating.
Background
The high-temperature mark mainly plays a role in traceability and identification during steel production, and marks information such as the processing state of steel. With the increase of the steel production speed and the continuous expansion of steel types, the spray printing temperature of the steel base material is also increased from the original average 650 ℃ to the average 950 ℃, the originally used spray printing coating is easy to generate fuzzy printing words or even no longer adhere when meeting the high-temperature steel base material (more than 750 ℃), the spray printing effect at high temperature is extremely poor, and the logistics is influenced. In addition, the spray printing coating is easy to fall off when the steel substrate is in an outdoor storage place and is exposed to the weather. In production practice, a spray printing coating which can adapt to various steel grades, is high-temperature resistant and is not easy to fall off under outdoor conditions is needed. At present, some high-temperature-resistant steel substrate marking spray-printing coatings exist, for example, Chinese patent CN 101724341B discloses a high-temperature-resistant slab marking spray-printing coating, and the coating comprises the following components in percentage by weight: adhesive: 30-35% and auxiliary agents: 47-60% of filler: 9-17%; wherein the binder is ethyl polysilicate; the auxiliary agent consists of carboxymethyl cellulose, kaolin and NaOH solution, and the auxiliary agent comprises the following components in percentage by weight: carboxymethyl cellulose: 5-10% of kaolin: 35-40% of NaOH solution: 7-10%; the filler is composed of titanium dioxide, alumina powder and lithopone, and the filler comprises the following components in percentage by weight: titanium dioxide: 3-6% of alumina powder: 3-6% of lithopone: 3-5%. The coating has poor high-temperature resistance effect and is easy to cause printing blurring; and has certain corrosiveness to steel. Chinese patent CN 104927420A discloses a high-temperature resistant marking paint, which is prepared by combining an inorganic solution subjected to solution molecule modification and chelation treatment with an anticorrosive pigment, a nano metal oxide, superfine rare earth micro powder, a brightener, a heat stabilizer and the like at high temperature. This coating has poor primary adhesion.
The existing high-temperature marking coating generally has poor adhesive force at high temperature, is easy to fall off or blur, and marks are easy to fall off in the curing process; the coatings are generally strong acid or strong alkali, are easy to corrode the pipeline systems of steel and spraying equipment, and after the coatings are stored outdoors for a long time, the spray printing coatings fall off, and the high-temperature spray printing writing is fuzzy, so that the coatings cannot be traced and cannot be identified.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the inorganic high-temperature marking coating which has good adhesive force at high temperature, short curing time and nearly neutral coating, and does not corrode steel substrates and a spraying pipeline system.
The invention is realized by the following technical scheme:
the first aspect of the invention provides an inorganic high-temperature marking paint, which comprises the following raw materials in parts by weight: 15-25 parts of titanium dioxide, 8-15 parts of superfine aluminum hydroxide, 5-8 parts of nano silicon dioxide, 3-5 parts of nano pseudo-boehmite, 0.1-0.3 part of silane coupling agent, 0.1-0.2 part of dispersing auxiliary agent, 0.1 part of hydrochloric acid and 0.5 part of ammonia water.
Preferably, the particle size of the nano pseudoboehmite is 50 nm; the particle size of the superfine aluminum hydroxide is 3-5 mu m.
Preferably, the dispersing aid is a 5040 dispersing agent.
The second aspect of the present invention provides a method for producing an inorganic high-temperature marking paint, the method comprising the steps of:
(1) dispersing nano silicon dioxide in deionized water, heating, adding a silane coupling agent, and stirring to obtain modified nano silicon dioxide gel;
(2) dispersing nano pseudo-boehmite in deionized water, heating, gradually adding hydrochloric acid to enable the pH value to be 4-5 to obtain acidic gel, and gradually adding ammonia water to enable the pH value to be 8-9 to obtain weakly alkaline stable gel;
(3) and (3) uniformly mixing the modified nano-silica gel obtained in the step (1) with the alkalescent stable gel obtained in the step (2), adding deionized water for mixing, and finally adding titanium dioxide, superfine aluminum hydroxide and a dispersing auxiliary agent for mixing and grinding to obtain the inorganic high-temperature marking paint.
Preferably, in the step (1), the heating temperature is 80-95 ℃.
Preferably, in the step (1), the mass ratio of the nano silicon dioxide to the deionized water is 1:2 to 1: 4.
Preferably, in the step (2), the heating temperature is 50-70 ℃.
Preferably, in the step (2), the mass ratio of the nano pseudoboehmite to the deionized water is 1: 8-1: 12.
Preferably, in the step (3), the mass ratio of the deionized water to the titanium dioxide is 1: 1-4: 1.
The third aspect of the invention provides the use of an inorganic high temperature marking paint in steel spray coating.
The invention has the beneficial effects that:
1. the inorganic high-temperature marking coating has good adhesive force at high temperature, can be suitable for spraying on a high-temperature steel substrate at the temperature of 150-1000 ℃, has high curing speed, and is not easy to shed or print fuzzy marks.
2. The steel after spray printing is stored outdoors for a long time, and the coating does not fall off under outdoor severe conditions.
3. The inorganic high-temperature marking paint is near neutral paint, and the sprayed and printed steel can not be corroded after being stored for a long time.
4. The coating is prepared from inorganic materials, does not release gases harmful to human bodies and the environment after being used, and is environment-friendly.
Drawings
FIG. 1 is a photograph of a steel substrate 1 sprayed with the inorganic high-temperature marking paint of the present invention at a high temperature;
FIG. 2 is a photograph of a steel substrate 2 sprayed at a high temperature with the inorganic high temperature marking paint of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
As described in the background art, the existing high-temperature marking paint has poor adhesion at high temperature; based on the inorganic high-temperature marking paint, the inorganic high-temperature marking paint can solve the problems, the pH value of the paint is close to neutral, and corrosion to steel or damage to the steel structure cannot be caused.
The inorganic high-temperature marking paint comprises the following raw materials in parts by weight: 15-25 parts of titanium dioxide, 8-15 parts of superfine aluminum hydroxide, 5-8 parts of nano silicon dioxide, 3-5 parts of nano pseudo-boehmite, 0.1-0.3 part of silane coupling agent, 0.1-0.2 part of dispersing auxiliary agent, 0.1 part of hydrochloric acid and 0.5 part of ammonia water.
The inorganic high-temperature marking paint is prepared by the following steps:
(1) dispersing nano silicon dioxide in deionized water, heating, adding a silane coupling agent, and stirring to obtain modified nano silicon dioxide gel;
(2) dispersing nano pseudo-boehmite in deionized water, heating, gradually adding hydrochloric acid to enable the pH value to be 4-5 to obtain acidic gel, and gradually adding ammonia water to enable the pH value to be 8-9 to obtain weakly alkaline stable gel;
(3) and (3) uniformly mixing the modified nano-silica gel obtained in the step (1) with the alkalescent stable gel obtained in the step (2), adding deionized water for mixing, and finally adding titanium dioxide, superfine aluminum hydroxide and a dispersing auxiliary agent for mixing and grinding to obtain the inorganic high-temperature marking paint.
The silane coupling agent has a chemical substance with a bidirectional reaction function, so that a bonding interface of a polymer and the nano silicon dioxide becomes a chemical bond for bonding, and the reinforcing property of the nano silicon dioxide is obviously improved. The modified nano silicon dioxide is in a gel state, so that the adhesive force, the scrubbing resistance, the weather resistance, the strength hardness, the toughness and the elasticity, the aging resistance, the antibiosis, the ultraviolet resistance and other characteristics of the coating can be improved, the performances of self-cleaning, water resistance, seepage resistance, abrasion resistance, corrosion resistance, color retention and the like of the coating are obviously improved, and simultaneously, the strength of a carbon layer of the coating can be obviously enhanced, so that the adhesive force of the coating is improved, and the strength and the hardness of a coating are increased; the bonding is a dehydration bonding using the silicon hydroxyl structure of the colloidal silica. The nanometer pseudo-boehmite is processed to form a colloidal aluminum hydroxyl structure, and the nanometer silicon dioxide and the nanometer pseudo-boehmite are dehydrated and combined at high temperature to respectively form a chemical bond of a silicon oxygen structure and an aluminum oxygen structure to be combined for adhesion. Fully dispersing the nano pseudo-boehmite in deionized water, and adding acid to form an acidic hydrated alumina gel structure; then ammonia water is added for stable neutralization to form a stable peptization structure in alkalescence, and the adhesive force is also improved. The nano pseudo-boehmite is beneficial to the gelation of the prepared product and the dehydration and bonding in application; meanwhile, the modified nano pseudo-boehmite gel structure is used as a binder, so that the suspension stability of a coating system is improved, and the coating can be sprayed very smoothly without blocking a nozzle. The superfine aluminum hydroxide can decompose and absorb a large amount of heat released by steel products at the initial spraying stage of the coating, so that the high-temperature resistance of the coating is improved; obviously delays the instant heating rate of the high-temperature steel sprayed with the coating, so that the coating can adapt to the adhesion of the steel surface at higher temperature; the alkalescent stable gel can enable superfine aluminum hydroxide, titanium dioxide and the like to be better dispersed in the whole bonding system. The nano silicon dioxide and the nano pseudo-boehmite play a role in binding in the formula, and the sum of the mass of the nano silicon dioxide and the mass of the nano pseudo-boehmite is M1; titanium dioxide and aluminum hydroxide are used as fillers, and the sum of the masses of the titanium dioxide and the aluminum hydroxide is M2, and the ratio of M1 to M2 influences the cohesiveness and the dispersibility of the coating, so that the coating with good dispersibility and cohesiveness can be obtained according to the raw material proportion of the invention. The finally prepared coating is close to neutral, does not corrode a base material and a spraying pipeline system, and is environment-friendly.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific embodiments. If the experimental conditions not specified in the examples are specified, the conditions are generally conventional or recommended by the reagent company; reagents, consumables, and the like used in the following examples are commercially available unless otherwise specified.
Example 1
(1) Dispersing 5kg of nano silicon dioxide in 20kg of deionized water, heating to 95 ℃, adding 0.1kg of silane coupling agent, and stirring to obtain modified nano silicon dioxide gel;
(2) dispersing 3kg of nano-boehmite in 24kg of deionized water, heating to 70 ℃, gradually adding 0.1kg of hydrochloric acid to adjust the pH to 4-5 to obtain an acidic gel, and gradually adding 0.5kg of ammonia water to adjust the pH to 8-9 to obtain an alkaline stable gel;
(3) and (2) uniformly mixing the modified nano-silica gel obtained in the step (1) with the alkaline stable gel obtained in the step (2), adding 15kg of deionized water, mixing, adding 15kg of titanium dioxide, 8kg of superfine aluminum hydroxide and 0.1kg of dispersing aid, mixing and grinding to obtain the inorganic high-temperature marking coating.
Example 2
(1) Dispersing 8kg of nano silicon dioxide in 16kg of deionized water, heating to 80 ℃, adding 0.3kg of silane coupling agent, and stirring to obtain modified nano silicon dioxide gel;
(2) dispersing 5kg of nano pseudo-boehmite in 60kg of deionized water, heating to 50 ℃, and gradually adding 0.1kg of hydrochloric acid to adjust the pH to 4-5 to obtain acidic gel; then gradually adding 0.5kg of ammonia water to adjust the pH to 8-9 to obtain alkaline stable gel;
(3) and (2) uniformly mixing the modified nano-silica gel obtained in the step (1) with the alkaline stable gel obtained in the step (2), adding 60kg of deionized water, mixing, then adding 25kg of titanium dioxide, 15kg of superfine aluminum hydroxide and 0.2kg of dispersing auxiliary agent, mixing and grinding to obtain the inorganic high-temperature marking coating.
The inorganic high-temperature marking paint prepared in the example 1 is used for spraying the steel substrate 1 at a high temperature, and the spraying photo is shown in figure 1; the inorganic high temperature marking paint prepared in example 2 was sprayed on the steel substrate 2 at a high temperature, and the photograph of the spray was shown in fig. 2. When spraying, the coating is sprayed on a high-temperature steel substrate at a nozzle diameter of 0.4mm, a spraying pressure of 0.1MPa and a spraying moving speed of 0.1m/s, and the coating thickness, the temperature of a steel-resistant matrix, the adhesive force, the hardness, the PH value and the curing time are shown in Table 1.
TABLE 1
| Item | Example 1 | Example 2 |
| Coating thickness μm | 10 | 10 |
| Temperature of steel substrate | ≤1007 | ≤1021 |
| Stage of adhesion | 1 | 1 |
| Hardness H | 4 | 4 |
| pH value | 7.2 | 7.2 |
| Curing time s | ≤2 | ≤2 |
Test example 1
The coatings prepared in examples 1 and 2 were sprayed on a steel slab of 400 ℃ of 0.2m × 0.2m × 1cm, cured and cooled, the steel slab was placed in a thermostat of 60 ℃ and irradiated with ultraviolet light for 30d, the steel slab was taken out and observed for the falling-off of the coatings on the steel slab and the corrosion of the steel slab, and after cooling to room temperature, the adhesion of the coatings was tested. The results are shown in Table 2.
TABLE 2
As can be seen from Table 2, in the environment simulating high-temperature solarization, the paint sprayed and printed on the steel plate blank does not fall off, basically has no corrosion to the steel, and has good adhesive force. Is suitable for long-term outdoor storage.
Test example 2
The coatings prepared in examples 1 and 2 were sprayed onto four 400 ℃ stainless steel plates of 0.1m × 0.1m × 1cm, cooled after curing, the stainless steel plates were placed in an acid solution of PH 6.0 and an alkali solution of PH 8.0, respectively, the stainless steel plates were taken out after 7 days, the falling-off of the coatings on the stainless steel plates was observed, the acid solution or alkali solution on the stainless steel plates was taken out cleanly, and the adhesion of the coatings was tested. The results are shown in Table 3.
TABLE 3
As can be seen from Table 3, the jet printing coating also maintained its basic color development ability under simulated outdoor acid rain or alkaline conditions. Can be completely suitable for outdoor severe environment.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (7)
1. The inorganic high-temperature marking paint is characterized by comprising the following raw materials in parts by weight: 15-25 parts of titanium dioxide, 8-15 parts of superfine aluminum hydroxide, 5-8 parts of nano silicon dioxide, 3-5 parts of nano pseudo-boehmite, 0.1-0.3 part of silane coupling agent, 0.1-0.2 part of dispersing auxiliary agent, 0.1 part of hydrochloric acid and 0.5 part of ammonia water; the particle size of the nano pseudoboehmite is 50 nm; the particle size of the superfine aluminum hydroxide is 3-5 mu m; the dispersing auxiliary agent is a 5040 dispersing agent;
the inorganic high-temperature marking paint is prepared by the following method:
(1) dispersing nano silicon dioxide in deionized water, heating, adding a silane coupling agent, and stirring to obtain modified nano silicon dioxide gel;
(2) dispersing nano pseudo-boehmite in deionized water, heating, gradually adding hydrochloric acid to enable the pH value to be 4-5 to obtain acidic gel, and gradually adding ammonia water to enable the pH value to be 8-9 to obtain weakly alkaline stable gel;
(3) and (3) uniformly mixing the modified nano-silica gel obtained in the step (1) and the alkalescent stable gel obtained in the step (2), adding deionized water for mixing, and finally adding titanium dioxide, superfine aluminum hydroxide and a dispersing auxiliary agent for mixing and grinding to obtain the inorganic high-temperature marking paint.
2. The inorganic high-temperature marking paint according to claim 1, wherein the heating temperature in the step (1) is 80-95 ℃.
3. The inorganic high-temperature marking paint as claimed in claim 1, wherein in the step (1), the mass ratio of the nano silicon dioxide to the deionized water is 1: 2-1: 4.
4. The inorganic high-temperature marking paint according to claim 1, wherein the heating temperature in the step (2) is 50-70 ℃.
5. The inorganic high-temperature marking paint as claimed in claim 1, wherein in the step (2), the mass ratio of the nano pseudoboehmite to the deionized water is 1: 8-1: 12.
6. The inorganic high-temperature marking paint as claimed in claim 1, wherein in the step (3), the mass ratio of the deionized water to the titanium dioxide is 1: 1-4: 1.
7. Use of the inorganic high temperature marking paint according to any one of claims 1 to 6 in steel spray coating.
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| CN115678331B (en) * | 2022-09-28 | 2023-07-14 | 惠州市益可涂料有限公司 | Temperature-resistant fireproof paint |
| CN115851007B (en) * | 2022-12-17 | 2024-08-09 | 化学与精细化工广东省实验室 | High-temperature steel thermal spraying marking paint and preparation method thereof |
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| JP3344256B2 (en) * | 1997-01-23 | 2002-11-11 | 日産自動車株式会社 | Coating liquid for forming hydrophilic film and method for producing the same |
| CN101481554A (en) * | 2009-01-22 | 2009-07-15 | 广州化工研究设计院 | High-hardness high temperature resistant non-fluoride aqueous nonstick coating |
| WO2013096238A1 (en) * | 2011-12-20 | 2013-06-27 | U.S. Coatings Ip Co. Llc | Coating process with self-crosslinkable composition for electrical steel sheet |
| CN103224719B (en) * | 2013-02-04 | 2015-05-13 | 湖北大学 | Fluorosilicone material for super-hydrophobic coating and its preparation method and use method |
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