A high-temperature-resistant silicone coating and a preparation method thereof

Abstract

The application provides a high-temperature-resistant silicone coating and a preparation method thereof, and belongs to the technical field of coatings. The high-temperature-resistant silicone coating is prepared from raw materials including the following components in mass fractions: 50-60 parts of silicone resin, 5-8 parts of fillers, 1-2 parts of dispersants, 0.5-1 part of defoaming agents and 15-25 parts of solvents; the fillers include kaolin and molybdenum disulfide. The application uses silicone resin as a film-forming agent, and the fillers can improve the high-temperature resistance of the coating; the kaolin and molybdenum disulfide can synergistically improve the high-temperature resistance of the coating, and the dispersants can improve the dispersibility of the fillers, thereby further improving the high-temperature resistance of the coating. Experimental results show that the coating prepared from the high-temperature-resistant silicone coating provided by the application does not crack or bubble at 1100 DEG C for 2 hours.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of coatings, and particularly relates to a high-temperature-resistant silicone coating and a preparation method thereof. BACKGROUND

[0002] Steel structures, large mechanical equipment, and various furnaces, fireplaces, boilers, hot blast furnaces, exhaust pipes, heat exchangers, and oil and gas field pipelines all need to be protected by high-temperature-resistant coatings. At present, silicone high-temperature-resistant coatings are mainly used, but they are only suitable for environments below 400 DEG C and cannot be used for long-term use at higher temperatures. Therefore, how to improve the high-temperature-resistant performance of the coating has become a technical problem to be solved in the field. SUMMARY

[0003] The application aims to provide a high-temperature-resistant silicone coating and a preparation method thereof. The high-temperature-resistant silicone coating provided by the application has excellent high-temperature-resistant performance.

[0004] In order to achieve the above-mentioned application purposes, the application provides the following technical solutions.

[0005] The application provides a high-temperature-resistant silicone coating prepared from raw materials including the following mass fractions:

[0006] 50-60 parts of silicone resin, 5-8 parts of filler, 1-2 parts of dispersant, 0.5-1 part of defoaming agent, and 15-25 parts of solvent;

[0007] The filler includes kaolin and molybdenum disulfide.

[0008] Preferably, the high-temperature-resistant silicone coating is prepared from raw materials including the following mass fractions:

[0009] 52-58 parts of silicone resin, 6-7 parts of filler, 1.2-1.8 parts of dispersant, 0.6-0.8 part of defoaming agent, and 18-22 parts of solvent.

[0010] Preferably, the mass ratio of the kaolin to the molybdenum disulfide is 1:(2-4).

[0011] Preferably, the mass ratio of the kaolin to the molybdenum disulfide is 1:3.

[0012] Preferably, the dispersant is at least one of BYK-190, BYK-182, and ORO-TAN 1124.

[0013] Preferably, the dispersant is BYK-190 and ORO-TAN 1124.

[0014] Preferably, the mass ratio of the BYK-190 to the ORO-TAN 1124 is (2-3):1.

[0015] Preferably, the defoamer is at least one of TEGO901W and BYK-012.

[0016] Preferably, when the defoamer is TEGO901W and BYK-012, the mass ratio of TEGO901W and BYK-012 is (1-2):(1-3).

[0017] This invention also provides a method for preparing the high-temperature resistant organosilicon coating described in the above technical solution, comprising:

[0018] A high-temperature resistant silicone coating is obtained by mixing silicone resin, filler, dispersant, defoamer and solvent.

[0019] This invention provides a high-temperature resistant silicone coating, prepared from raw materials comprising the following parts by weight: 50-60 parts silicone resin, 5-8 parts filler, 1-2 parts dispersant, 0.5-1 part defoamer, and 15-25 parts solvent; the filler includes kaolin and molybdenum disulfide. This invention uses silicone resin as a film-forming agent, and the combination with filler can improve the high-temperature resistance of the coating; wherein, kaolin and molybdenum disulfide synergistically improve the high-temperature resistance of the coating, and the dispersant improves the dispersibility of the filler, thereby further improving the high-temperature resistance of the coating. Experimental results show that the coating made from the high-temperature resistant silicone coating provided by this invention does not crack or blister after being kept at 1100℃ for 2 hours. Detailed Implementation

[0020] This invention provides a high-temperature resistant organosilicon coating, prepared from raw materials comprising the following parts by weight:

[0021] The ingredients are: 50-60 parts silicone resin, 5-8 parts filler, 1-2 parts dispersant, 0.5-1 part defoamer, and 15-25 parts solvent.

[0022] The filler includes kaolin and molybdenum disulfide.

[0023] This invention does not impose any special restrictions on the source of the raw materials; commercially available products familiar to those skilled in the art can be used.

[0024] The raw materials for preparing the high-temperature resistant organosilicon coating of the present invention comprise 50-60 parts by weight of organosilicon resin. As one embodiment, the organosilicon resin may be 52-58 parts by weight, or even 53, 54, 55, 56, or 57 parts by weight. In this invention, the organosilicon resin serves as a film-forming agent; limiting the weight of the organosilicon resin within the above-mentioned range further improves the high-temperature resistance of the coating.

[0025] The present invention does not have any particular limitation on the type of silicone resin, and any silicone resin well known to those skilled in the art can be used.

[0026] In one embodiment, the silicone resin may be Wacker Ren60.

[0027] The raw materials for preparing the high-temperature resistant silicone coating of the present invention further include 5 to 8 parts of filler, based on 50 to 60 parts by weight of silicone resin. In one embodiment, the filler may be 6 to 7 parts by weight. In the present invention, the filler can improve the high-temperature resistance of the coating; by limiting the filler's mass percentage within the above-mentioned range, the high-temperature resistance of the coating can be further improved.

[0028] In this invention, the filler comprises kaolin and molybdenum disulfide; the mass ratio of kaolin to molybdenum disulfide is preferably 1:(2-4), more preferably 1:3. In this invention, kaolin and molybdenum disulfide can synergistically improve the high-temperature resistance of the coating; by limiting the mass ratio of kaolin to molybdenum disulfide within the above range, the high-temperature resistance of the coating can be further improved.

[0029] The present invention does not have a special limitation on the particle size of the molybdenum disulfide, and any molybdenum disulfide known to those skilled in the art can be used.

[0030] The raw materials for preparing the high-temperature resistant silicone coating of the present invention further include 1-2 parts of dispersant, based on 50-60 parts by weight of silicone resin. As one embodiment, the dispersant may be 1.2-1.8 parts by weight, or 1.4-1.6 parts by weight. In the present invention, the dispersant can improve the dispersibility of the filler, thereby further improving the high-temperature resistance of the coating.

[0031] In this invention, the dispersant is preferably at least one of BYK-190, BYK-182, and OROTAN 1124, more preferably BYK-190 and OROTAN 1124. Limiting the type of dispersant to the above-mentioned range further improves the high-temperature resistance of the coating.

[0032] In this invention, when the dispersant is BYK-190 and OROTAN 1124, the preferred mass ratio of BYK-190 to OROTAN 1124 is (2-3):1. This invention limits the mass ratio of BYK-190 to OROTAN 1124 to within the above range to further improve the high-temperature resistance of the coating.

[0033] The raw materials for preparing the high-temperature resistant silicone coating of the present invention further include 0.5 to 1 part of defoamer, based on 50 to 60 parts by weight of silicone resin. As one embodiment, the defoamer may be 0.6 to 0.8 parts by weight, or even 0.7 parts. In the present invention, the defoamer can remove air bubbles from the coating, thereby further improving the high-temperature resistance of the coating.

[0034] In this invention, the defoamer is preferably at least one of TEGO901W and BYK-012, more preferably TEGO901W and BYK-012; when the defoamer is TEGO901W and BYK-012, the mass ratio of TEGO901W to BYK-012 is preferably (1-2):(1-3). Limiting the mass ratio of TEGO901W to BYK-012 to the above-mentioned range further improves the high-temperature resistance of the coating.

[0035] The raw materials for preparing the high-temperature resistant silicone coating of the present invention further include 15-25 parts of solvent, based on 50-60 parts by weight of silicone resin. In one embodiment, the solvent may be 18-22 parts by weight, or 19-20 parts by weight. In the present invention, the solvent is used to dissolve the components.

[0036] In this invention, the solvent is preferably an organic solvent. This invention does not impose any particular limitation on the type of organic solvent; adjustments can be made according to actual needs.

[0037] As one implementation method, the solvent may be xylene.

[0038] This invention uses organosilicon resin as a film-forming agent, and the addition of fillers can improve the high-temperature resistance of the coating. Among them, kaolin and molybdenum disulfide can synergistically improve the high-temperature resistance of the coating, and the dispersant can improve the dispersibility of the filler, thereby further improving the high-temperature resistance of the coating.

[0039] This invention also provides a method for preparing the high-temperature resistant organosilicon coating described in the above technical solution, comprising:

[0040] A high-temperature resistant silicone coating is obtained by mixing silicone resin, filler, dispersant, defoamer and solvent.

[0041] The present invention does not impose any special limitations on the mixing operation of the organosilicon resin, filler, dispersant, defoamer and solvent, and any technical solution for preparing the mixture well known to those skilled in the art can be used.

[0042] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0043] The silicone resin used in the examples and comparative examples was Ren60: 60% solids by mass, manufactured by Wacker Chemie AG, Germany.

[0044] All molybdenum disulfide products are special molybdenum disulfide for coatings and paints produced by Luoyang Shenyu Molybdenum Industry Co., Ltd.

[0045] All kaolin is special kaolin for the filling industry produced by Jiangsu Jungao Technology Co., Ltd.

[0046] Example 1

[0047] The high-temperature resistant silicone coating is prepared from the following raw materials in parts by weight:

[0048] 50 parts silicone resin, 8 parts filler, 1 part dispersant, 1 part defoamer, and 15 parts solvent;

[0049] The filler is kaolin and molybdenum disulfide, with a mass ratio of kaolin to molybdenum disulfide of 1:2;

[0050] The dispersant is BYK-190;

[0051] The defoamer is TEGO901W;

[0052] The solvent is xylene;

[0053] The preparation method of the high-temperature resistant organosilicon coating is as follows:

[0054] A high-temperature resistant silicone coating is obtained by mixing silicone resin, filler, dispersant, defoamer and solvent.

[0055] Comparative Example 1

[0056] Kaolin was omitted from Example 1, the filler content remained unchanged, and everything else was the same as in Example 1.

[0057] Comparative Example 2

[0058] Based on Example 1, molybdenum disulfide was omitted, the filler content remained unchanged, and everything else was the same as in Example 1.

[0059] The coating preparation method is as follows:

[0060] The aluminum material was immersed in a 1 mol / L NaOH solution to remove surface dirt and the natural oxide film on the aluminum surface. Then, the high-temperature resistant organosilicon coatings prepared in Example 1 and Comparative Examples 1-2 were directly dripped onto the aluminum sheet surface. After the surface dried, it was placed in a muffle furnace and cured at 200°C for 1 hour to obtain the coating.

[0061] The method for testing high temperature resistance is as follows: Place the coating prepared by the high temperature resistant silicone coating in a muffle furnace, raise it to 300-1300℃ at 50℃ / min and keep it at that temperature for 2 hours. After the temperature drops to 25℃, observe whether the coating produces phenomena such as delamination, peeling, blistering, or cracking. Record the temperature at which the coating does not crack or blister.

[0062] The high-temperature resistance data of the coatings prepared by the high-temperature resistant organosilicon coatings of Examples 1 and Comparative Examples 1-2 are shown in Table 1.

[0063] Table 1. High-temperature resistance properties of the coatings prepared from the high-temperature resistant silicone coatings of Example 1 and Comparative Examples 1-2.

[0064] Item Temperature resistance performance / °C Example 1 1150 Comparative Example 1 1050 Comparative Example 2 1100

[0065] As can be seen from Table 1, kaolin and molybdenum disulfide can synergistically improve the high-temperature resistance of the coating, while omitting kaolin or molybdenum disulfide will significantly reduce the high-temperature resistance of the coating.

[0066] Example 2

[0067] Based on Example 1, the mass ratio of kaolin to molybdenum disulfide was modified to 1:3, while other conditions remained unchanged.

[0068] Example 3

[0069] Based on Example 1, the mass ratio of kaolin to molybdenum disulfide was modified to 1:4, while other conditions remained unchanged.

[0070] Comparative Example 3

[0071] Based on Example 1, the mass ratio of kaolin to molybdenum disulfide was modified to 1:1, while other conditions remained unchanged.

[0072] Comparative Example 4

[0073] Based on Example 1, the mass ratio of kaolin to molybdenum disulfide was modified to 1:5, while other conditions remained unchanged.

[0074] The high-temperature resistant organosilicon coatings of Examples 1-3 and Comparative Examples 3-4 were prepared into coatings using the method of Example 1, and their high-temperature resistance was tested. The results are shown in Table 2.

[0075] Table 2 shows the high-temperature resistance of the coatings prepared from the high-temperature resistant silicone coatings of Examples 1-3 and Comparative Examples 3-4.

[0076]

[0077]

[0078] As can be seen from Table 2, controlling the kaolin and molybdenum disulfide within the range of this invention can improve the high-temperature resistance of the coating.

[0079] Example 4

[0080] Based on Example 1, the dispersant was replaced with BYK-190 and OROTAN 1124, with a mass ratio of BYK-190 to OROTAN 1124 of 2:1, while other conditions remained unchanged.

[0081] Example 5

[0082] Based on Example 1, the dispersant was replaced with OROTAN 1124, while the dispersant content and other conditions remained unchanged.

[0083] The high-temperature resistant silicone coatings of Examples 1 and 4-5 were prepared into coatings using the method of Example 1, and their high-temperature resistance was tested. The results are shown in Table 3.

[0084] Table 3 shows the high-temperature resistance properties of the coatings prepared from the high-temperature resistant silicone coatings in Examples 1 and 4-5.

[0085] Item Temperature resistance performance / °C Example 1 1150 Example 4 1200 Example 5 1100

[0086] As can be seen from Table 3, dispersants BYK-190 and OROTAN 1124 can synergistically improve dispersion performance, thereby playing the role of filler and further improving the high temperature resistance of the coating.

[0087] Example 6

[0088] Based on Example 1, the defoamer was replaced with TEGO901W and BYK-012, with the mass ratio of TEGO901W to BYK-012 being 1:3, while other conditions remained unchanged.

[0089] Example 7

[0090] Based on Example 1, the defoamer was replaced with BYK-012, while other conditions remained unchanged.

[0091] The high-temperature resistant organosilicon coatings of Examples 1 and 6-7 were prepared into coatings using the method of Example 1, and their high-temperature resistance was tested. The results are shown in Table 4.

[0092] Table 4 shows the high-temperature resistance properties of the coatings prepared from the high-temperature resistant silicone coatings in Examples 1 and 6-7.

[0093]

[0094]

[0095] As can be seen from Table 4, the defoamers TEGO901W and BYK-012 can synergistically improve the high-temperature resistance of the coating.

[0096] Example 8

[0097] The high-temperature resistant silicone coating is prepared from the following raw materials in parts by weight:

[0098] The ingredients were 60 parts silicone resin, 5 parts filler, 2 parts dispersant, 0.5 parts defoamer, and 25 parts solvent, with other conditions the same as in Example 1.

[0099] Example 9

[0100] The high-temperature resistant silicone coating is prepared from the following raw materials in parts by weight:

[0101] The ingredients were 55 parts silicone resin, 6 parts filler, 1.5 parts dispersant, 0.8 parts defoamer, and 20 parts solvent, with other conditions the same as in Example 1.

[0102] The high-temperature resistant silicone coatings of Examples 8 and 9 were prepared into coatings using the method of Example 1, and their high-temperature resistance was tested. The results are shown in Table 5.

[0103] Table 5 shows the high-temperature resistance properties of the coatings prepared from the high-temperature resistant silicone coatings in Examples 8-9.

[0104] Item Temperature resistance performance / °C Example 8 1100 Example 9 1100

[0105] As can be seen from Table 5, the coating provided by the present invention has excellent high temperature resistance.

[0106] As can be seen from the above embodiments and comparative examples, the coating made of the high-temperature resistant organosilicon coating provided by the present invention has excellent high-temperature resistance.

[0107] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high-temperature resistant organosilicon coating, prepared from the following raw materials in parts by weight: The ingredients are: 50-60 parts silicone resin, 5-8 parts filler, 1-2 parts dispersant, 0.5-1 part defoamer, and 15-25 parts solvent. The filler is kaolin and molybdenum disulfide; The mass ratio of kaolin to molybdenum disulfide is 1:(2~4); The dispersants are BYK-190 and OROTAN 1124; The defoamers are TEGO901W and BYK-012; The mass ratio of BYK-190 to OROTAN 1124 is (2~3):1; The mass ratio of TEGO901W to BYK-012 is (1~2):(1~3).

2. The high-temperature resistant organosilicon coating according to claim 1, characterized in that, The high-temperature resistant silicone coating is prepared from the following raw materials in parts by weight: The ingredients are: 52-58 parts silicone resin, 6-7 parts filler, 1.2-1.8 parts dispersant, 0.6-0.8 parts defoamer, and 18-22 parts solvent.

3. The high-temperature resistant organosilicon coating according to claim 1, characterized in that, The mass ratio of kaolin to molybdenum disulfide is 1:

3.

4. A method for preparing the high-temperature resistant organosilicon coating according to any one of claims 1 to 3, comprising: A high-temperature resistant silicone coating is obtained by mixing silicone resin, filler, dispersant, defoamer and solvent.

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