Coating composition as well as preparation method and application thereof

Abstract

The invention discloses a coating composition as well as a preparation method and application thereof, and relates to the technical field of coatings. The coating composition provided by the invention comprises organic-inorganic hybrid resin, hollow glass beads, aerogel and an auxiliary agent. The organic-inorganic hybrid resin with a specific structure is introduced as a film forming substance, and is matched with the aerogel, the hollow glass beads and other components, so that the high-temperature resistance is improved while the constructability, the adhesive force and the low heat conductivity coefficient are ensured, and the coating can be used for a long time in a high-temperature environment; the water-based heat-insulating coating has the advantages of high heat-insulating property, favorable acid / alkali resistance, favorable water resistance, favorable salt fog resistance and favorable impact strength, can adapt to different environments, is suitable for being used as a water-based heat-insulating coating for metal surfaces, and is particularly suitable for preparing heat-insulating coatings for various mechanical equipment, such as heat-insulating coatings for chemical equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and particularly relates to a coating composition, a preparation method thereof, and an application thereof. Background Art

[0002] As is well known, the oil and gas industry is an energy-intensive industry, and hot fluids need to be handled in different operation stages such as mining, transportation, processing, and storage. In order to improve the production efficiency of oil and gas and reduce costs at the same time, it is very important to minimize the energy loss in the production process, and the reduction of energy loss is mainly achieved by improving the heat insulation performance of equipment to reduce heat energy loss.

[0003] Insulating coatings have been widely studied and applied in the heat insulation of production equipment due to their advantages such as stable thermal conductivity and processability. However, many chemical equipment need to be put into use at 150 - 200 °C, which requires that the coating formed by the insulating coating not only has a heat insulation effect but also has a certain high-temperature resistance performance. However, most of the current insulating coatings can only achieve a low thermal conductivity, but it is difficult to achieve high-temperature resistance performance and cannot be used for a long time in a high-temperature environment of 150 - 200 °C. Summary of the Invention

[0004] The present invention aims to at least solve one of the above technical problems existing in the prior art. For this reason, the purpose of the present invention is to provide a coating composition, using an organic-inorganic hybrid resin with a specific structure as a film-forming substance, and combining components such as hollow microspheres and aerogels to reduce the thermal conductivity of the coating formed by the coating composition and improve the high-temperature resistance performance of the coating.

[0005] The second aspect of the present invention lies in providing a preparation method of a coating composition.

[0006] The third aspect of the present invention lies in providing a heat-insulating coating.

[0007] The fourth aspect of the present invention lies in providing an application of a coating composition or a heat-insulating coating.

[0008] In order to achieve the above purpose, the technical solutions adopted by the present invention are as follows:

[0009] The first aspect of the present invention provides a coating composition, comprising an organic-inorganic hybrid resin, hollow glass microspheres, aerogel, and an additive; the organic-inorganic hybrid resin comprises repeating units shown in the following formula (1):

[0010]

[0011] In the coating composition of the present invention, an organic-inorganic hybrid resin including a component having a structural unit shown in formula (1) is used as a film-forming substance. It not only has good anti-cracking performance and adhesion, but also has excellent high-temperature resistance. At the same time, it also improves properties such as acid and alkali resistance, water resistance, and salt spray resistance, and the impact strength of the formed coating is also improved. By combining hollow glass microspheres and aerogels as the main heat insulation and heat preservation components, the thermal conductivity can be effectively reduced, enabling the coating composition to achieve the dual properties of heat preservation and high-temperature resistance. Therefore, the coating composition of the present invention can be used as a water-based heat-insulating coating.

[0012] In some embodiments of the present invention, the organic-inorganic hybrid resin is obtained by an esterification reaction of a fluorocarbon resin and a methylphenyl silicone resin; the fluorocarbon resin and the methylphenyl silicone resin each contain at least one carboxyl group or hydroxyl group, and they are not both carboxyl groups or hydroxyl groups.

[0013] The fluorocarbon resin has excellent flexibility, ductility, acid and alkali resistance, weather resistance, and relatively high adhesion. Using it to prepare an organic-inorganic hybrid resin can provide room temperature curing performance and excellent anti-cracking performance for the coating composition. Therefore, when using the coating composition of the present invention as a heat-insulating coating, the probability of coating cracking can be reduced, and the risk of coating cracking caused by the relatively thicker spraying thickness of the heat-insulating coating compared to ordinary coatings can be lowered.

[0014] Methylphenyl silicone resin is a high polymer of polyorganic groups. The Si-O in its main chain has a high bond energy. Therefore, under high-temperature conditions, the activation energy for chemical bond breakage is high, and it has higher thermal stability and antioxidant properties than other organic polymers. Compared with other hydrocarbon polymers, methylphenyl silicone resin can maintain its initial physical properties without decomposition or color change even when used at a relatively high temperature range (200 - 250 °C) for a long time. Therefore, using methylphenyl silicone resin to synthesize an organic-inorganic hybrid resin as a film-forming substance can provide excellent high-temperature resistance for the coating composition.

[0015] It should be noted that the curing temperature of methylphenyl silicone resin is relatively high and needs to be cured at 150 - 250 °C. Therefore, when spraying the coating composition of the present invention, the spraying temperature in the early stage is relatively low, and the curing is mainly provided by the fluorocarbon resin segment in the organic-inorganic hybrid resin to increase the coating curing speed and ensure the adhesion in the early stage of spraying. After the temperature rises in the later stage, the methylphenyl silicone resin segment in the organic-inorganic hybrid resin continues to cure to provide high-temperature resistance.

[0016] In some embodiments of the present invention, the organic-inorganic hybrid resin is prepared by a method including the following steps:

[0017] Mix the fluorocarbon resin and methylphenyl silicone resin to obtain a mixture; add concentrated sulfuric acid to the mixture and carry out reflux condensation under oil bath conditions to obtain a reaction product; subject the reaction product to vacuum distillation to remove impurities to obtain an organic-inorganic hybrid resin.

[0018] It should be understood that since the organic-inorganic hybrid resin is obtained by the reaction of the fluorocarbon resin and methylphenyl silicone resin, there are still some unreacted fluorocarbon resin and / or methylphenyl silicone resin remaining in the prepared organic-inorganic hybrid resin.

[0019] In some specific embodiments of the present invention, the temperature for mixing the fluorocarbon resin and methylphenyl silicone resin is 45-55 °C; the mixing method includes stirring for 20-40 min.

[0020] In some specific embodiments of the present invention, the concentrated sulfuric acid is slowly added dropwise to the mixture; the concentrated sulfuric acid is added dropwise within 40-60 min. The purpose of controlling the dropping rate of the concentrated sulfuric acid is to ensure safety and avoid the phenomenon of explosive polymerization of the concentrated sulfuric acid.

[0021] In some specific embodiments of the present invention, the reaction temperature for reflux is 75-85 °C; the reaction time is 4-5 h.

[0022] In some specific embodiments of the present invention, the vacuum distillation is carried out at 60-80 °C.

[0023] In some embodiments of the present invention, the fluorocarbon resin structure contains at least one carboxyl group.

[0024] In some embodiments of the present invention, the methylphenyl silicone resin structure contains at least one hydroxyl group.

[0025] In some embodiments of the present invention, the fluorocarbon resin is a waterborne elastic fluorocarbon resin.

[0026] In some embodiments of the present invention, the methylphenyl silicone resin is a waterborne methylphenyl silicone resin.

[0027] In some embodiments of the present invention, the molar ratio of the fluorocarbon resin to the methylphenyl silicone resin is (1-3):1.

[0028] In some embodiments of the present invention, the molar ratio of the fluorocarbon resin to the methylphenyl silicone resin is (2-3):1.

[0029] In some specific embodiments of the present invention, the molar ratio of the fluorocarbon resin to the methylphenyl silicone resin is (1.5-2.5):1.

[0030] In some examples of the present invention, the molar ratio of the fluorocarbon resin to the methylphenyl silicone resin is (1.8-2.2):1.

[0031] In some embodiments of the present invention, the coating composition further comprises water; the coating composition comprises the following components by weight:

[0032] 20-40 parts of organic-inorganic hybrid resin, 5-20 parts of hollow glass microspheres, 8-18 parts of aerogel, 3-9 parts of additives, and 20-40 parts of water.

[0033] In some embodiments of the present invention, the coating composition comprises the following components by weight: 30-40 parts of organic-inorganic hybrid resin, 5-15 parts of hollow glass microspheres, 8-15 parts of aerogel, 3.5-8.7 parts of additives, and 20-35 parts of water.

[0034] In some specific embodiments of the present invention, the coating composition includes the following components by mass: 30-40 parts of organic-inorganic hybrid resin, 7-12 parts of hollow glass microspheres, 8-13 parts of aerogel, 3.5-7 parts of additives, and 25-35 parts of water.

[0035] In some embodiments of the present invention, the auxiliary agent includes a wetting and dispersing agent, a defoaming agent, a neutralizing agent, a film-forming auxiliary agent, a thickener and a bactericide; the auxiliary agent includes the following components in parts by mass:

[0036] 1.5-3.5 parts of wetting and dispersing agent, 0.2-0.5 parts of defoaming agent, 0.1-0.4 parts of neutralizing agent, 1-3 parts of film-forming aid, 0.1-1 parts of thickener, and 0.1-0.6 parts of bactericide.

[0037] In some embodiments of the present invention, the coating composition comprises the following components in parts by mass:

[0038] 20-40 parts of organic-inorganic hybrid resin, 5-20 parts of hollow glass microspheres, 8-18 parts of aerogel, 20-40 parts of water, 1.5-3.5 parts of wetting and dispersing agent, 0.2-0.5 parts of defoaming agent, 0.1-0.4 parts of neutralizing agent, 1-3 parts of film-forming aid, 0.1-1 parts of thickener, and 0.1-0.6 parts of bactericide.

[0039] In some embodiments of the present invention, the additives include the following components by weight: 2 to 3.5 parts of wetting and dispersing agent, 0.2 to 0.4 parts of defoaming agent, 0.1 to 0.3 parts of neutralizing agent, 1 to 3 parts of film-forming aid, 0.1 to 1 parts of thickener, and 0.1 to 0.5 parts of bactericide.

[0040] In some specific embodiments of the present invention, the auxiliary agent, by mass fraction, comprises the following components: 2-3 parts of a wetting dispersant, 0.2-0.4 parts of an antifoaming agent, 0.1-0.3 parts of a neutralizing agent, 1-2 parts of a film-forming auxiliary agent, 0.1-1 part of a thickener, and 0.1-0.3 parts of a bactericide.

[0041] In some embodiments of the present invention, the density of the aerogel is 0.1-0.2 g / cm 3 。

[0042] In some embodiments of the present invention, the D90 of the aerogel is 140-210 μm.

[0043] In some embodiments of the present invention, the D90 of the aerogel is 150-200 μm.

[0044] In some specific embodiments of the present invention, the D90 of the aerogel is 150-160 μm.

[0045] In some embodiments of the present invention, the aerogel is a hydrophobic aerogel.

[0046] The hydrophobic aerogel will not dissolve in the aqueous system, avoiding the problem that the destruction of the aerogel structure causes the aerogel to fail to adsorb air and reduce the thermal conductivity.

[0047] In some embodiments of the present invention, the wetting dispersant comprises at least one of an anionic carboxylate dispersant, a cationic quaternary ammonium salt dispersant, and a modified polymer dispersant.

[0048] Due to the relatively large specific surface areas of the aerogel and the hollow glass microspheres, it is relatively difficult to disperse them into the organic-inorganic hybrid resin. However, the anionic carboxylate dispersant, the cationic quaternary ammonium salt dispersant, and the modified polymer dispersant have better viscosity reduction effects and better dispersion effects.

[0049] In some embodiments of the present invention, the density of the hollow glass microspheres is 0.2-0.3 g / cm 3 ; the D90 of the hollow glass microspheres is 60-100 μm.

[0050] In some embodiments of the present invention, the wetting dispersant comprises at least one of BYK-W969 of BYK, Dispers750W of Degussa, and AFCONA-4720 of Efka.

[0051] In some embodiments of the present invention, the antifoaming agent comprises at least one of an organosilicon antifoaming agent and a mineral antifoaming agent.

[0052] In some embodiments of the present invention, the neutralizing agent comprises an alkanolamine neutralizing agent.

[0053] In some embodiments of the present invention, the film-forming auxiliary includes at least one of dodecyl ester, dipropylene glycol butyl ether, diethylene glycol butyl ether, and propylene glycol diacetate.

[0054] In some embodiments of the present invention, the thickener includes at least one of polyurethane thickeners and alkali-swellable thickeners.

[0055] In some embodiments of the present invention, the antibacterial agent includes at least one of OIT-45 from Shanghai Pengtu Antibacterial, 290PT from Shanghai Wanhou Biotechnology, and FPD from Plon International Trade.

[0056] The second aspect of the present invention provides a method for preparing the coating composition described in the first aspect of the present invention, comprising the following steps:

[0057] Mix the organic-inorganic hybrid resin and the auxiliary in water, and then add the aerogel and hollow glass microspheres and mix to obtain the coating composition.

[0058] In some embodiments of the present invention, the aerogel and hollow glass microspheres are added multiple times to ensure uniform mixing of the aerogel and hollow glass microspheres with other components. Before each addition, it is ensured that the previously added aerogel and hollow glass microspheres have been uniformly mixed.

[0059] In some embodiments of the present invention, the method for preparing the coating composition includes the following steps:

[0060] Mix the organic-inorganic hybrid resin, wetting dispersant, defoamer, film-forming auxiliary, fungicide, and neutralizer in water, then add the aerogel and hollow glass microspheres in batches and mix, and finally add the thickener and mix to obtain the coating composition.

[0061] The third aspect of the present invention provides a thermal insulation coating, and the preparation raw materials include the coating composition described in the first aspect of the present invention.

[0062] The fourth aspect of the present invention provides an application of the coating composition described in the first aspect of the present invention or the thermal insulation coating described in the third aspect in the preparation of mechanical equipment, oil storage tanks, or petrochemical pipelines.

[0063] In some embodiments of the present invention, the mechanical equipment includes chemical equipment.

[0064] Compared with the prior art, the present invention has at least the following beneficial effects:

[0065] (1) The present invention provides a coating composition, which uses an organic-inorganic hybrid resin with a specific structure as the film-forming substance, and is combined with aerogel, hollow glass microspheres, etc. as the main heat-insulating functional components. While ensuring the workability, adhesion and heat preservation performance of the coating composition, it significantly improves the high-temperature resistance effect of the coating composition. The formed coating can be used for a long time under high-temperature conditions, overcoming the problem that existing heat-insulating coatings cannot be used for a long time in a high-temperature environment of 150-200 °C, and has the dual properties of heat preservation and high-temperature resistance. In addition, the coating composition also has good alkali resistance, water resistance and salt spray resistance, and the formed coating has good impact strength.

[0066] (2) The preparation method of the coating composition of the present invention has simple operation steps, can efficiently prepare products, and can realize industrial large-scale production.

[0067] (3) While ensuring the workability, adhesion and low thermal conductivity of the coating composition of the present invention, it improves the high-temperature resistance performance, and has good acid and alkali resistance, water resistance, salt spray resistance and impact strength. It can adapt to different environments and is suitable as a water-based heat-insulating coating for metal surfaces to form a heat-insulating coating, especially suitable for preparing heat-insulating coatings for various mechanical equipment, oil storage tanks or petrochemical pipelines, such as heat-insulating coatings for chemical equipment. Detailed Embodiments

[0068] The content of the present invention will be further described in detail through specific embodiments below. The raw materials, reagents or devices used in the embodiments and comparative examples can be obtained from conventional commercial channels or can be obtained by existing technical methods unless otherwise specified. Unless otherwise specified, the test or testing methods are all conventional methods in the art.

[0069] The descriptions of some raw materials used in the following embodiments and comparative examples of the present invention are as follows:

[0070] Water-based elastic fluorocarbon resin: HT-620F, Beijing Runbo Hengtong Technology;

[0071] Water-based methylphenyl silicone resin: SH-9608, Kelongsheng Sihai New Materials;

[0072] Wetting and dispersing agent: AFCONA-4720 of Efkona;

[0073] Defoaming agent: Conventional commercially available silicone defoaming agent;

[0074] Hollow glass microspheres: HS20 of Zhengzhou Shenglaite Hollow Microsphere New Materials Co., Ltd., with a density of 0.20 g / cm 3 , and D90 is 90 μm;

[0075] Aerogel: The hydrophobic aerogel A110 of Guangdong Elisheng Technology Co., Ltd., with a density of 0.15 g / cm 3 , and D90 is 150 μm;

[0076] Neutralizing agent: Conventional commercially available alkanolamine neutralizing agents;

[0077] Film-forming aid: Conventional commercially available dodecyl esters;

[0078] Thickening agent: Conventional commercially available polyurethane thickening agents;

[0079] Bactericide: OIT-45 of Shanghai Pengtu Antibacterial.

[0080] The following is a detailed description in combination with specific examples and comparative examples.

[0081] Example 1

[0082] A coating composition, by mass, includes 30 parts of water, 30 parts of organic-inorganic hybrid resin, 3 parts of wetting and dispersing agent, 0.3 part of defoaming agent, 9 parts of hollow glass microspheres, 10 parts of aerogel, 0.2 part of neutralizing agent, 1 part of film-forming aid, 0.1 part of thickening agent, and 0.2 part of bactericide.

[0083] Among them, the preparation method of the organic-inorganic hybrid resin is as follows:

[0084] S1. Take 500 grams of waterborne elastic fluorocarbon resin and 500 grams of waterborne methylphenyl silicone resin, add them to a 250 mL four-necked flask equipped with a stirrer, thermometer, constant pressure dropping funnel, and reflux condenser according to a molar ratio of 1:1, and place it in an oil bath. Raise the temperature to 50 °C and stir constantly for 30 min;

[0085] S2. Take 10 grams of concentrated sulfuric acid, and slowly add it dropwise to the four-necked flask through the constant pressure dropping funnel, control the dropping rate to be completed in 50 min, then raise the temperature to 80 °C, and continue to heat and stir for 4 h;

[0086] S3. After the reaction is completed, under the condition of 65 °C, distill off the reaction impurities under reduced pressure to obtain the organic-inorganic hybrid resin;

[0087] The reaction formula of the repeating unit involved in the preparation process is as follows:

[0088]

[0089] The preparation method of the coating composition of Example 1 includes the following steps:

[0090] Mix the organic-inorganic hybrid resin, wetting and dispersing agent, defoaming agent, film-forming aid, fungicide and neutralizing agent evenly in water, then add the aerogel and hollow glass microspheres in several portions to ensure their uniform mixing in the system, and finally add the thickener to obtain the coating composition.

[0091] Example 2

[0092] A coating composition, different from Example 1 in that: in the organic-inorganic hybrid resin, the molar ratio of the elastic fluorocarbon resin to the methylphenyl silicone resin is 2:1; the rest is the same as in Example 1; the preparation method is the same as in Example 1.

[0093] Example 3

[0094] A coating composition, different from Example 1 in that: in the preparation of the organic-inorganic hybrid resin, the molar ratio of the elastic fluorocarbon resin to the methylphenyl silicone resin is 3:1; the rest is the same as in Example 1; the preparation method is the same as in Example 1.

[0095] Example 4

[0096] A coating composition, different from Example 2 in that: the mass fraction of the organic-inorganic hybrid resin is 40 parts; the rest is the same as in Example 1; the preparation method is the same as in Example 1.

[0097] Example 5

[0098] A coating composition, different from Example 1 in that: the D90 of the aerogel is 100 μm; the rest is the same as in Example 1; the preparation method is the same as in Example 1.

[0099] Comparative Example 1

[0100] A coating composition, different from Example 2 in that: the organic-inorganic hybrid resin is replaced with an equal amount of elastic fluorocarbon resin; the rest is the same as in Example 1; the preparation method is the same as in Example 1.

[0101] Comparative Example 2

[0102] A coating composition, different from Example 2 in that: the organic-inorganic hybrid resin is replaced with an equal amount of methylphenyl silicone resin; the rest is the same as in Example 1; the preparation method is the same as in Example 1.

[0103] Comparative Example 3

[0104] A coating composition, different from Example 3 in that: the organic-inorganic hybrid resin is replaced with an equal amount of a conventional commercially available acrylic emulsion; the rest is the same as in Example 1; the preparation method is the same as in Example 1.

[0105] Result Detection

[0106] To verify the performance and environmental conditions that the coating compositions of the present invention can adapt to, the coating compositions of each example and comparative example were tested. The test standards refer to HG / T 5182-2017 Thermal insulation coatings for petroleum and chemical equipment. Using an air spraying device, the coating was sprayed on a sandblasted steel plate with a spraying thickness of 1 mm. The size and thickness of the sandblasted steel plate refer to the corresponding standard requirements. The sprayed samples were placed in an oven at 60 °C and baked for 7 days, and then various tests were carried out.

[0107] Among them, the test results of heat resistance (i.e., heat tolerance) recorded the cracking situation and the yellowing grade. The yellowing was divided into grades 0-5. Grade 0 represents no yellowing, and grades 1-5 represent increasingly severe yellowing.

[0108] The test results are shown in Table 1 and Table 2.

[0109] Table 1 Test results of the workability, adhesion, thermal conductivity and heat resistance of the coating composition

[0110]

[0111] As can be seen from Table 1, by using an organic-inorganic hybrid resin with a specific structure and combining components such as aerogel and hollow glass microspheres, the coating composition obtained by the present invention has good performance. The thermal insulation coating formed on the metal surface has good adhesion and workability, will not crack severely or have too low adhesion to affect the use, and also has a low thermal conductivity, good heat insulation performance, and a low degree of yellowing at 200 °C, and good high-temperature resistance, overcoming the problem that existing thermal insulation coatings cannot be used for a long time in a high-temperature environment of 150-200 °C.

[0112] In Comparative Example 1, although there is no cracking, the high-temperature resistance is poor and severe yellowing occurs; in Comparative Example 2, although there is no yellowing, severe cracking occurs and the adhesion is poor, making it difficult to achieve actual use.

[0113] Table 2 Test results of the impact strength, acid and alkali resistance, water resistance and salt spray resistance of the coating composition

[0114] Acid resistance duration (h) Alkali resistance duration (h) Water resistance duration (h) Salt spray resistance duration (h) Impact strength (cm) Example 1 72 24 72 120 15 Example 2 120 72 168 360 20 Example 3 120 168 168 700 23 Example 4 120 168 168 700 30 Example 5 72 24 72 120 15 Comparative Example 1 168 168 168 700 35 Comparative Example 2 24 24 24 24 5 Comparative Example 3 48 48 168 72 20

[0115] By testing the impact strength, acid and alkali resistance, water resistance and salt spray resistance of the thermal insulation coatings formed by the coating compositions of the examples and comparative examples, the environmental conditions they can adapt to can be further compared. As shown in Table 2, combined with the results of Table 1, it can be found that the coatings formed by the coating compositions of Examples 1-4 of the present invention have better comprehensive performance.

[0116] It can be seen from the test results of Examples 1 to 3 that with the increase in the molar amount of the neutral fluorocarbon resin in the organic-inorganic hybrid resin, the adhesion, acid resistance, alkali resistance, salt spray resistance and impact strength of the thermal insulation coating are continuously improved. This is mainly because the elastic fluorocarbon resin has excellent flexibility, adhesion and resistance, and its introduction into the system can improve the various properties of the system. However, with the increase in the amount of fluorocarbon resin introduced, the temperature resistance of the system deteriorates, and at a temperature of 200°C, the yellowing resistance of the coating becomes worse and worse.

[0117] By comparing Example 2 and Example 4, it can be seen that as the amount of organic-inorganic hybrid resin increases, various properties increase, and the thermal conductivity also increases, but at this time, the thermal insulation requirements of the thermal insulation coating can still be met. The increase in thermal conductivity is due to the high thermal conductivity of the organic-inorganic hybrid resin, so adding too much will increase the thermal conductivity of the system, which is not conducive to thermal insulation.

[0118] It can also be seen from the thermal conductivity data of Examples 1 to 4 that when the amounts of hollow glass microspheres and aerogel in the coating composition remain unchanged, the thermal conductivity is mainly affected by the amount of resin used.

[0119] Compared with Example 2, in Comparative Examples 1 and 2, fluorocarbon resin and methylphenyl silicone resin are used to replace the organic-inorganic hybrid resin, respectively. Among them, the coating composition using elastic fluorocarbon resin alone as a film-forming substance has poor high temperature resistance, and the composition using methylphenyl silicone resin alone as a film-forming substance is prone to cracking, which affects the use.

[0120] In summary, the present invention introduces a methylphenyl silicone resin with a specific structure as a film-forming substance, and forms a coating composition with ingredients such as aerogel and hollow glass microspheres. While ensuring workability, adhesion and low thermal conductivity, the high temperature resistance is improved, so that the coating can be used for a long time in a high temperature environment, and has good acid and alkali resistance, water resistance, salt spray resistance and impact strength, can adapt to different environments, and is suitable as a water-based thermal insulation coating for metal surfaces, especially suitable for preparing thermal insulation coatings for various mechanical equipment, oil storage tanks or petrochemical pipelines, such as thermal insulation coatings for chemical equipment.

[0121] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention shall be equivalent replacement methods and shall be included in the protection scope of the present invention.

Claims

1. A coating composition, characterized in that It comprises an organic-inorganic hybrid resin, hollow glass microspheres, aerogel and an additive; the organic-inorganic hybrid resin comprises a repeating unit represented by formula (1):

2. The coating composition according to claim 1, characterized in that The organic-inorganic hybrid resin is obtained by esterification reaction of fluorocarbon resin and methylphenyl silicone resin; the fluorocarbon resin and the methylphenyl silicone resin respectively contain at least one carboxyl group or hydroxyl group, and the carboxyl group or hydroxyl group is different.

3. The coating composition according to claim 2, characterized in that The molar ratio of the fluorocarbon resin to the methylphenyl silicone resin is (1-3):

1.

4. The coating composition according to claim 1, characterized in that The coating composition also includes water; the coating composition includes the following components by mass: 20-40 parts of organic-inorganic hybrid resin, 5-20 parts of hollow glass microspheres, 8-18 parts of aerogel, 3-9 parts of additives, and 20-40 parts of water.

5. The coating composition according to claim 4, characterized in that The additives include a wetting and dispersing agent, a defoaming agent, a neutralizing agent, a film-forming aid, a thickener and a bactericide; the additives include the following components by weight: 1.5-3.5 parts of wetting and dispersing agent, 0.2-0.5 parts of defoaming agent, 0.1-0.4 parts of neutralizing agent, 1-3 parts of film-forming aid, 0.1-1 parts of thickener, and 0.1-0.6 parts of bactericide.

6. The coating composition according to claim 1 or 5, characterized in that The density of the aerogel is 0.1-0.2 g / cm 3 ; and / or, the D90 of the aerogel is 140 to 210 μm; And / or, the aerogel is a hydrophobic aerogel.

7. The coating composition according to claim 5, characterized in that The wetting dispersant includes at least one of anionic carboxylate dispersants, cationic quaternary ammonium salt dispersants, and modified polymer dispersants; And / or, the defoamer includes at least one of an organosilicon defoamer and a mineral defoamer; and / or, the neutralizing agent comprises an alcoholamine neutralizing agent; And / or, the film-forming aid includes at least one of lauryl alcohol ester, dipropylene glycol butyl ether, diethylene glycol butyl ether, and propylene glycol diacetate; And / or, the thickener includes at least one of a polyurethane thickener and an alkaline swelling thickener.

8. A method for preparing the coating composition according to any one of claims 1 to 7, characterized in that: The following steps are involved: The organic-inorganic hybrid resin and the auxiliary agent are mixed in water, and then the aerogel and the hollow glass microspheres are added and mixed to obtain the coating composition.

9. A thermal insulation coating, characterized in that: The preparation raw materials include the coating composition according to any one of claims 1 to 7.

10. Use of the coating composition according to any one of claims 1 to 7 or the thermal insulation coating according to claim 9 in the preparation of mechanical equipment, oil storage tanks or petrochemical pipelines.

Images