Thermal insulation coating material for high-temperature pipeline and preparation process of thermal insulation coating material
The four-layer high-temperature pipeline insulation coating material solves the problems of difficult thermal conductivity control and weak interlayer bonding of traditional coating materials, achieving high efficiency, energy saving and long-term stable thermal management.
Patent Information
- Application Number
- CN202511992937.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-26
- Publication Date
- 2026-02-24
AI Technical Summary
Traditional high-temperature pipeline insulation coating materials suffer from difficulties in controlling thermal conductivity, weak interlayer bonding, and insufficient weather resistance, making it difficult to meet the requirements of high efficiency, energy saving, and long-term stable operation.
The thermal insulation coating material adopts a four-layer structure, including a primer layer, an insulation layer, an insulation reinforcement layer, and a topcoat layer. Through the combination and treatment of specific components, a gradient thermal conductivity design is formed to enhance the interfacial bonding and weather resistance.
This improved thermal management efficiency, reduced interlayer thermal resistance, enhanced the mechanical strength and weather resistance of the coating, and ensured the long-term stable operation of the pipeline.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of coating technology, specifically to a thermal insulation coating material for high-temperature pipelines and its preparation process. Background Technology
[0002] High-temperature pipelines are widely used in industrial fields such as petrochemicals and power energy. Their thermal insulation performance directly affects energy utilization efficiency and operational safety. Traditional high-temperature pipeline insulation coatings mostly adopt single-layer or double-layer structures, which have problems such as difficulty in controlling thermal conductivity, weak interlayer bonding, and insufficient weather resistance. For example, common insulation materials such as rock wool and aluminum silicate fiber have thermal insulation effects, but they are prone to water absorption, leading to a decline in thermal insulation performance. Moreover, their adhesion to metal substrates is insufficient, making them prone to peeling failure. Some silicone resin coatings, although resistant to high temperatures, have poor crack resistance and are prone to aging and cracking under long-term high-temperature environments, reducing their thermal insulation effect. In addition, traditional coatings lack systematic design in terms of heat radiation reflection and heat flow gradient control, resulting in large fluctuations in pipeline surface temperature and high heat loss rates, making it difficult to meet the requirements of high efficiency, energy saving, and long-term stable operation.
[0003] In existing technologies, while multi-layer composite thermal insulation coatings attempt to improve performance through layered design, significant shortcomings remain in the selection of materials for each layer and the interface treatment. For example, interfacial stress often arises between the insulation layer and the primer layer due to the difference in thermal expansion coefficients, leading to coating cracking; the topcoat layer lacks sufficient weather resistance and is susceptible to ultraviolet radiation and acid / alkali corrosion, shortening its service life; although some coatings use hollow microspheres or aerogels as fillers, they lack surface modification treatment, resulting in poor compatibility with the resin matrix and easy interface defects, affecting thermal insulation performance and mechanical strength. Therefore, there is an urgent need to develop a high-temperature pipeline thermal insulation coating material with gradient thermal conductivity design, strong interfacial bonding, and synergistic effects of efficient thermal insulation and weather protection to solve key problems in traditional technologies such as low thermal management efficiency, weak interlayer bonding, and poor durability, and to meet the long-term stable operation requirements of high-temperature pipelines under complex working conditions. Summary of the Invention
[0004] Technical problems to be solved In view of the above-mentioned shortcomings of the existing technology, the present invention provides a thermal insulation coating material for high-temperature pipelines and its preparation process, which can effectively solve the problem that the thermal insulation performance of the existing thermal insulation coating materials needs to be improved.
[0005] Technical solution To achieve the above objectives, the present invention provides the following technical solution: A thermal insulation coating material for high-temperature pipelines, the thermal insulation coating material for high-temperature pipelines comprises: a primer layer material, a thermal insulation layer material, a thermal insulation reinforcement layer material, and a topcoat layer material; The primer layer material is composed of the following components: epoxy-modified silicone resin, silanized hollow ceramic microspheres, modified ground glass fiber, xylene, butanol, and dispersant; The insulation layer material is composed of the following components: titanium dioxide-coated hollow glass microspheres, hydroxyethyl cellulose, dispersant, film-forming aid, defoamer, silica aerogel, styrene-acrylic emulsion, silica sol, and thickener; The thermal insulation and reinforcement layer material is composed of the following components: potassium hexatite whiskers, silica aerogel, wetting agent, fluorosilicone acrylic emulsion, defoamer, leveling agent, film-forming aid and thickener; The topcoat material is composed of the following components: fluorocarbon resin, isocyanate curing agent, butyl acetate, propylene glycol methacrylate, fluorinated graphene, nano silica, silane coupling agent KH-560, and butanol.
[0006] Furthermore, the preparation method of the silanized hollow ceramic microspheres is as follows: Weigh 1 part by weight of silane coupling agent KH-550 and add it to 500 parts by weight of 90% ethanol aqueous solution. Stir at 400-500 r / min for 10 min, then add 50 parts by weight of hollow ceramic microspheres. Disperse the mixture ultrasonically at 300W power at 60℃ for 1 h, then place it in an oven at 120℃ for 3 h. After cooling to room temperature, grind it through a 200 mesh sieve. The result is silanized hollow ceramic microspheres. The method for preparing the modified ground glass fiber is as follows: Weigh 3 parts by weight of silane coupling agent KH-550 and add it to 500 parts by weight of 90% ethanol aqueous solution. Stir at 400-500 r / min for 10 min, then add 50 parts by weight of ground glass fiber. Stir at 300-400 r / min for 30 min at 60℃ water bath temperature, then place in an oven at 120℃ for 3 h. After cooling to room temperature, grind through a 200 mesh sieve to obtain modified ground glass fiber.
[0007] Furthermore, the preparation method of the primer layer material is as follows: Weigh out 50 parts by weight of epoxy-modified silicone resin, 10-15 parts by weight of silanized hollow ceramic microspheres, 5-8 parts by weight of modified ground glass fiber, 20-25 parts by weight of xylene, 5-8 parts by weight of butanol and 1-2 parts by weight of dispersant, and mix them. Stir at 300-400 r / min for 30-45 min to obtain the primer layer material.
[0008] Furthermore, the preparation method of the titanium dioxide-coated hollow glass microspheres is as follows: Five parts by weight of hollow glass microspheres were weighed and poured into 50 parts by weight of deionized water. The mixture was stirred at a constant temperature of 60℃ and a speed of 300-400 r / min for 30 min. Six to seven parts by weight of a 10% titanium sulfate solution were added dropwise at a low speed of 1 drop / s, while a 10% sodium hydroxide solution was added dropwise to maintain the pH of the reaction system at 7. After the reaction was completed, the mixture was aged for 2 h, filtered and washed until the pH reached 7, and then dried in an oven at 105℃ to constant weight. After calcination at 600℃ for 2 h, the resulting product was titanium dioxide-coated hollow glass microspheres.
[0009] Furthermore, the preparation steps of the insulation layer material are as follows: Step 1: Weigh 0.1 parts by weight of hydroxyethyl cellulose and add it to 20-30 parts by weight of deionized water. Stir at 500 r / min for 15 min, then add 0.5-1.1 parts by weight of dispersant, 1-2 parts by weight of film-forming aid and 0.3-0.5 parts by weight of defoamer. Continue stirring for 10 min. The result is recorded as the mixture component. Step 2: Add 15-20 parts by weight of titanium dioxide-coated hollow glass microspheres and 10-20 parts by weight of silica aerogel to the mixture components. Stir at 1000 r / min for 30 min, then add 15-20 parts by weight of styrene-acrylic emulsion. Continue stirring for 10 min, then add 10-15 parts by weight of silica sol. Continue stirring for 20 min, then add 0.3-0.8 parts by weight of thickener and 0.1-0.3 parts by weight of defoamer. Stir at 500 r / min for 30 min to obtain the insulation layer material.
[0010] Furthermore, the preparation steps of the thermal insulation and reinforcement layer material are as follows: Step A: Weigh 15-18 parts by weight of potassium hexatitanate whiskers, 8-12 parts by weight of silica aerogel, 0.5-1.2 parts by weight of wetting agent, 0.5-1 parts by weight of silane coupling agent KH-560 and 30-40 parts by weight of deionized water and mix them. After ultrasonic dispersion at a frequency of 40kHz for 30 minutes, the resulting mixture is recorded as the mixed solution system. Step B: Add 20-30 parts by weight of fluorosilicone acrylic emulsion to the mixture system and stir at a stirring speed of 400-500 r / min for 30 min. Then add 0.3-0.6 parts by weight of defoamer, 0.2-0.5 parts by weight of leveling agent, 1.5-2.5 parts by weight of film-forming aid and 0.8-1.5 parts by weight of thickener. Continue stirring for 10 min to obtain the thermal insulation and reinforcement layer material.
[0011] Furthermore, the method for preparing the fluorinated graphene is as follows: Weigh 0.8-0.9 parts by weight of fluorinated graphene and pour it into 1L of ethanol solution with a concentration of 10g / mL polyvinylpyrrolidone. Disperse the solution by sonication at a frequency of 40kHz for 10min, then stir at a speed of 1200r / min for 10h. Centrifuge at a speed of 5000r / min for 10min, take the supernatant, filter and wash away excess polyvinylpyrrolidone, and finally dry it in a vacuum drying oven at 60℃ for 12h. The result is fluorinated graphene.
[0012] Furthermore, the preparation steps of the topcoat layer material are as follows: Step I: Weigh 3-5 parts by weight of nano-silica and 0.5-1 parts by weight of fluorinated graphene and disperse them in 20-25 parts by weight of anhydrous butanol. After ultrasonic dispersion at a frequency of 30kHz for 5 minutes, record it as the dispersion component. Mix silane coupling agent KH-560 and deionized water at a weight ratio of 1:2 and stir at a speed of 400-500r / min for 30 minutes, and record it as the hydrolysis component. Step II: Mix the dispersion component and the hydrolysis component at a weight ratio of 1:15, stir at a stirring speed of 300-400 r / min for 2 hours at a water bath temperature of 60℃, filter to remove the filtrate, and record the resulting particulate component. Step III: Weigh 100 parts by weight of fluorocarbon resin and 13 parts by weight of isocyanate curing agent and mix them to obtain the main component; mix 7 parts by weight of butyl acetate and 3 parts by weight of propylene glycol methacrylate to obtain the diluent component. Step IV: Mix the main component and diluent component at a weight ratio of 3:2, add 15-20% of the particle component by weight of the main component, stir at a stirring speed of 300-500 r / min for 10 min, and vacuum for 2-3 min to obtain the topcoat layer material.
[0013] A preparation process for a thermal insulation coating material for high-temperature pipelines, the preparation process comprising the following steps: S1. After cleaning the pipe surface, apply multiple coats of primer to form a primer layer with a thickness of 0.5-0.8mm. After the primer layer has cured, spray or apply multiple coats of insulation material to form an insulation layer with a thickness of 5-35mm. S2. After the insulation layer has cured, spray or coat multiple layers of insulation reinforcement material to form an insulation reinforcement layer with a thickness of 5-15mm. After the insulation reinforcement layer has cured, coat multiple layers of topcoat material to form a topcoat layer with a thickness of 0.5-1mm.
[0014] Furthermore, the cleaning method in S1 is to remove rust, oil, and dust from the surface of the metal pipe by sandblasting or mechanical grinding, and to make the surface of the metal pipe rough enough to facilitate the adhesion of the primer layer material.
[0015] Beneficial effects This invention provides a thermal insulation coating material for high-temperature pipelines and its preparation process. Compared with existing technologies, this invention has the following advantages: 1. The primer material of this invention provides high temperature resistance and chemical corrosion resistance through epoxy-modified silicone resin. Silanized hollow ceramic microspheres form chemical bonds with the substrate through silane bonds, enhancing adhesion. The addition of modified ground glass fiber can improve the crack resistance and mechanical strength of the primer. The silanization treatment significantly improves the interfacial compatibility between inorganic fillers and organic resin, reducing interfacial defects. Precise control of the primer thickness ensures strong bonding with the metal substrate while avoiding interfacial stress concentration caused by differences in thermal expansion coefficients. Secondly, the silicone resin in the primer layer can form a compatible transition with the styrene-acrylic emulsion / silica sol in the insulation layer, reducing interfacial thermal resistance and ensuring the continuity of heat flow gradient transfer in the insulation layer.
[0016] 2. The titanium dioxide-coated hollow glass microspheres in the insulation layer material of this invention have a "core-shell" structure. The titanium dioxide shell reflects heat radiation, while the core of the hollow glass microspheres reduces thermal conductivity. Silica aerogel provides ultra-low thermal conductivity, and the composite film formed by styrene-acrylic emulsion and silica sol enhances the coating's density. Hydroxyethyl cellulose, as a dispersant, ensures uniform dispersion of the microspheres and aerogel. Film-forming aids and defoamers synergistically optimize the coating's pore structure, avoiding thermal bridging effects caused by air bubbles. Secondly... The styrene-acrylic emulsion in the insulation layer and the epoxy-modified silicone resin in the primer layer can form chemical cross-links, enhancing the interlayer bonding. The "soft-hard" composite structure of the insulation layer and the reinforcement layer is matched. The insulation layer provides the main thermal insulation performance, while the reinforcement layer inhibits the volume shrinkage cracking of the insulation layer caused by temperature gradient. Moreover, the thermal conductivity of the insulation layer decreases in a gradient with that of the primer layer and the insulation reinforcement layer, matching the radial heat flow attenuation law of the pipeline, which can achieve full-link thermal management of "low thermal resistance incident - high efficiency thermal insulation - weather resistance protection". 3. In this invention, the potassium hexatitanate whiskers in the thermal insulation and reinforcement layer material are oriented to form a "bridging" network in the fluorosilicone-acrylic emulsion, which can inhibit the propagation of microcracks. The silica aerogel fills the pores secondary, maintaining low thermal conductivity. The fluorosilicone-acrylic emulsion provides weather resistance over a wide temperature range of -40℃ to 200℃. A chemically compatible transition can be formed between the fluorosilicone-acrylic emulsion and the fluorocarbon resin in the topcoat layer, enhancing topcoat adhesion. The silane coupling agent KH-560 hydrolyzed component in the topcoat layer material can react with the hydroxyl groups on the surface of the reinforcement layer to form chemical bonds, thereby improving the adhesion of the topcoat layer. The thermally conductive network of fluorinated graphene synergizes with the thermal insulation structure of the reinforcement layer, avoiding aging caused by localized overheating. The four-layer structure of this invention, through a gradient functional design of "substrate anchoring - multi-level thermal insulation - crack resistance enhancement - weather resistance protection," achieves comprehensive optimization of thermal performance, mechanical strength, weather resistance, durability, and construction efficiency, demonstrating significant technological advancement and industrial application value. Detailed Implementation
[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0018] The present invention will be further described below with reference to embodiments.
[0019] The sources of some components in the examples and comparative examples are as follows: Epoxy-modified silicone resin, Changzhou Jianuo Silicone Co., Ltd. Xylene, TCI (Shanghai) Chemical Industry Development Co., Ltd.; Butanol, TCI (Shanghai) Chemical Industry Development Co., Ltd.; Dispersant, DISPERBYK-2163, BYK Additives (Shanghai) Co., Ltd.; KH-550 silane coupling agent, Wuhan University Organosilicon New Materials Co., Ltd.; Ethanol, Sinopharm Chemical Reagent Co., Ltd.; Hollow ceramic microspheres, Hebei Hengguang Mineral Products Co., Ltd.; Hollow glass microspheres, particle size 40-120µm, Qinhuang Glass Microspheres Co., Ltd. Ground glass fibers, 11µm in diameter, Qinhuang Glass Microspheres Co., Ltd. Titanium sulfate, Sinopharm Chemical Reagent Co., Ltd.; Sodium hydroxide, Sinopharm Chemical Reagent Co., Ltd. Hydroxyethyl cellulose, Wuxi Handerson Chemical Co., Ltd.; Film-forming aids, Wuxi Handerson Chemical Co., Ltd.; Defoamer, Wuxi Handerson Chemical Co., Ltd.; Silica aerogel, 20-30µm, Shanghai Haoluo Industrial Co., Ltd.; Styrene-acrylic emulsion, 50% solids content, BASF; Silica sol, solid content 30%, Zhejiang Yuda Chemical Co., Ltd. Thickener, Wuxi Handerson Chemical Co., Ltd.; Potassium hexatite whiskers, Tangshan Whisker Composite Materials Manufacturing Co., Ltd.; Wetting agent, Shenzhen Yoshida Chemical Co., Ltd.; Fluorosilicone-acrylic emulsion, solid content 30%, Shanghai Xunda New Material Technology Co., Ltd. Fluorocarbon resin, polyurethane grade fluorocarbon resin, Hunan Benan Yada New Materials Co., Ltd.; Isocyanate curing agent, Shanghai Kaiyin Chemical Co., Ltd.; Butyl acetate, Shanghai McLean Technology Co., Ltd. Propylene glycol methacrylate, Shanghai McLean Technology Co., Ltd. Fluorinated graphite, Shanghai Fubang Chemical Co., Ltd.; Polyvinylpyrrolidone, Tianjin Damao Chemical Reagent Factory; Nano-silica, Zhejiang Lijie Chemical Co., Ltd.; KH-560 silane coupling agent, Wuhan University Organosilicon New Materials Co., Ltd.; Butanol, Shanghai McLean Technology Co., Ltd.
[0020] Example 1 This embodiment provides a thermal insulation coating material for high-temperature pipelines. The composition of the thermal insulation coating material for high-temperature pipelines includes: a primer layer material, a thermal insulation layer material, a thermal insulation reinforcement layer material, and a topcoat layer material. The primer layer material consists of the following components: epoxy-modified silicone resin, silanized hollow ceramic microspheres, modified ground glass fiber, xylene, butanol, and dispersant; The preparation method of silanized hollow ceramic microspheres is as follows: Weigh 1 part by weight of silane coupling agent KH-550 and add it to 500 parts by weight of 90% ethanol aqueous solution. Stir at 400 r / min for 10 min, then add 50 parts by weight of hollow ceramic microspheres. Disperse the mixture ultrasonically at 300 W at 60℃ for 1 h, then place it in an oven at 120℃ for 3 h. After cooling to room temperature, grind it through a 200 mesh sieve. The result is silanized hollow ceramic microspheres. The preparation method of modified ground glass fiber is as follows: Weigh 3 parts by weight of silane coupling agent KH-550 and add it to 500 parts by weight of 90% ethanol aqueous solution. Stir at 400 r / min for 10 min, then add 50 parts by weight of ground glass fiber. Stir at 300 r / min for 30 min at 60℃ water bath temperature, then place in an oven at 120℃ for 3 h. After cooling to room temperature, grind and pass through a 200 mesh sieve. The result is modified ground glass fiber.
[0021] The preparation method of the primer layer material is as follows: Weigh out 50 parts by weight of epoxy-modified silicone resin, 10 parts by weight of silanized hollow ceramic microspheres, 5 parts by weight of modified ground glass fiber, 20 parts by weight of xylene, 5 parts by weight of butanol and 1 part by weight of dispersant, mix them, and stir at 300 r / min for 30 min to obtain the primer layer material.
[0022] The insulation layer material is composed of the following components: titanium dioxide-coated hollow glass microspheres, hydroxyethyl cellulose, dispersant, film-forming aid, defoamer, silica aerogel, styrene-acrylic emulsion, silica sol, and thickener; The preparation method of titanium dioxide coated hollow glass microspheres is as follows: Five parts by weight of hollow glass microspheres were added to 50 parts by weight of deionized water. The mixture was stirred at 300 r / min for 30 min at a constant temperature of 60℃. Six parts by weight of 10% titanium sulfate solution were added dropwise at a low rate of 1 drop / s, while 10% sodium hydroxide solution was added dropwise to maintain the pH of the reaction system at 7. After the reaction was completed, the mixture was aged for 2 h, filtered and washed until the pH reached 7, and then dried in an oven at 105℃ to constant weight. After calcination at 600℃ for 2 h, the resulting product was titanium dioxide-coated hollow glass microspheres.
[0023] The preparation steps of the insulation layer material are as follows: Step 1: Weigh 0.1 parts by weight of hydroxyethyl cellulose and add it to 20 parts by weight of deionized water. Stir at 500 r / min for 15 min, then add 0.5 parts by weight of dispersant, 1 part by weight of film-forming aid and 0.3 parts by weight of defoamer. Continue stirring for 10 min. The resulting mixture is recorded as the component of the mixture. Step 2: Add 15 parts by weight of titanium dioxide-coated hollow glass microspheres and 10 parts by weight of silica aerogel to the mixture components. Stir at 1000 r / min for 30 min, then add 15 parts by weight of styrene-acrylic emulsion. Continue stirring for 10 min, then add 10 parts by weight of silica sol. Continue stirring for 20 min, then add 0.3 parts by weight of thickener and 0.1 parts by weight of defoamer. Stir at 500 r / min for 30 min to obtain the insulation layer material.
[0024] The thermal insulation and reinforcement layer material is composed of the following components: potassium hexatite whiskers, silica aerogel, wetting agent, fluorosilicone acrylic emulsion, defoamer, leveling agent, film-forming aid and thickener; The preparation steps of the thermal insulation and reinforcement layer material are as follows: Step A: Weigh 15 parts by weight of potassium hexatitanate whiskers, 8 parts by weight of silica aerogel, 0.5 parts by weight of wetting agent, 0.5 parts by weight of silane coupling agent KH-560 and 30 parts by weight of deionized water and mix them. After ultrasonic dispersion at a frequency of 40kHz for 30min, the resulting mixture is recorded as the mixed solution system. Step B: Add 20 parts by weight of fluorosilicone acrylic emulsion to the mixture system and stir at 400 r / min for 30 min. Then add 0.3 parts by weight of defoamer, 0.2 parts by weight of leveling agent, 1.5 parts by weight of film-forming aid and 0.8 parts by weight of thickener, and continue stirring for 10 min. The resulting material is the thermal insulation and reinforcement layer material.
[0025] The topcoat material consists of the following components: fluorocarbon resin, isocyanate curing agent, butyl acetate, propylene glycol methacrylate, fluorinated graphene, nano-silica, silane coupling agent KH-560, and butanol; The preparation method of fluorinated graphene is as follows: Weigh 0.8 parts by weight of fluorinated graphene and pour it into 1L of ethanol solution with a concentration of 10g / mL polyvinylpyrrolidone. Disperse the solution ultrasonically at a frequency of 40kHz for 10min, then stir at a speed of 1200r / min for 10h. Next, centrifuge at a speed of 5000r / min for 10min. Take the supernatant, filter it to wash away excess polyvinylpyrrolidone, and finally dry it in a vacuum drying oven at 60℃ for 12h. The result is fluorinated graphene.
[0026] The preparation steps for the topcoat layer material are as follows: Step I: Weigh 3 parts by weight of nano-silica and 0.5 parts by weight of fluorinated graphene and disperse them in 20 parts by weight of anhydrous butanol. After ultrasonic dispersion at a frequency of 30 kHz for 5 min, record it as the dispersion component. Mix silane coupling agent KH-560 and deionized water at a weight ratio of 1:2 and stir at a speed of 400 r / min for 30 min, record it as the hydrolysis component. Step II: Mix the dispersion component and the hydrolysis component at a weight ratio of 1:15, stir at 300 r / min for 2 h in a water bath at 60 °C, filter to remove the filtrate, and record the resulting mixture as the particle component. Step III: Weigh 100 parts by weight of fluorocarbon resin and 13 parts by weight of isocyanate curing agent and mix them to obtain the main component; mix 7 parts by weight of butyl acetate and 3 parts by weight of propylene glycol methacrylate to obtain the diluent component. Step IV: Mix the main component and diluent component at a weight ratio of 3:2, add a medium amount of particle component (15% of the weight of the main component), stir at a stirring speed of 300 r / min for 10 min, and vacuum for 2 min to obtain the topcoat layer material.
[0027] A preparation process for a thermal insulation coating material for high-temperature pipelines, comprising the following steps: S1. After cleaning the pipe surface, apply multiple coats of primer material to form a primer layer with a thickness of 0.5mm. After the primer layer cures, spray or apply multiple coats of insulation material to form an insulation layer with a thickness of 5mm. The cleaning method is as follows: the surface of the metal pipe is sandblasted or mechanically ground to remove loose rust, oil, dust and make the surface of the metal pipe rough enough to facilitate the adhesion of the primer material. S2. After the insulation layer has cured, spray or coat multiple layers of insulation reinforcement material to form a 5mm thick insulation reinforcement layer. After the insulation reinforcement layer has cured, coat multiple layers of topcoat material to form a 0.5mm thick topcoat layer.
[0028] Example 2 This embodiment provides a thermal insulation coating material for high-temperature pipelines. The composition of the thermal insulation coating material for high-temperature pipelines includes: a primer layer material, a thermal insulation layer material, a thermal insulation reinforcement layer material, and a topcoat layer material. The primer layer material consists of the following components: epoxy-modified silicone resin, silanized hollow ceramic microspheres, modified ground glass fiber, xylene, butanol, and dispersant; The preparation method of silanized hollow ceramic microspheres is as follows: Weigh 1 part by weight of silane coupling agent KH-550 and add it to 500 parts by weight of 90% ethanol aqueous solution. Stir at 500 r / min for 10 min, then add 50 parts by weight of hollow ceramic microspheres. Disperse the mixture ultrasonically at 300 W at 60℃ for 1 h, then place it in an oven at 120℃ for 3 h. After cooling to room temperature, grind it through a 200 mesh sieve. The result is silanized hollow ceramic microspheres. The preparation method of modified ground glass fiber is as follows: Weigh 3 parts by weight of silane coupling agent KH-550 and add it to 500 parts by weight of 90% ethanol aqueous solution. Stir at 500 r / min for 10 min, then add 50 parts by weight of ground glass fiber. Stir at 400 r / min for 30 min at 60℃ water bath temperature, then place in an oven at 120℃ for 3 h. After cooling to room temperature, grind and pass through a 200 mesh sieve. The result is modified ground glass fiber.
[0029] The preparation method of the primer layer material is as follows: Weigh out 50 parts by weight of epoxy-modified silicone resin, 15 parts by weight of silanized hollow ceramic microspheres, 8 parts by weight of modified ground glass fiber, 25 parts by weight of xylene, 8 parts by weight of butanol and 2 parts by weight of dispersant, mix them and stir at 400 r / min for 45 min to obtain the primer layer material.
[0030] The insulation layer material is composed of the following components: titanium dioxide-coated hollow glass microspheres, hydroxyethyl cellulose, dispersant, film-forming aid, defoamer, silica aerogel, styrene-acrylic emulsion, silica sol, and thickener; The preparation method of titanium dioxide coated hollow glass microspheres is as follows: Five parts by weight of hollow glass microspheres were added to 50 parts by weight of deionized water. The mixture was stirred at 400 r / min for 30 min at a constant temperature of 60℃. Seven parts by weight of 10% titanium sulfate solution were added dropwise at a low rate of 1 drop / s, while 10% sodium hydroxide solution was added dropwise to maintain the pH of the reaction system at 7. After the reaction was completed, the mixture was aged for 2 h, filtered and washed until the pH reached 7, and then dried in an oven at 105℃ to constant weight. After calcination at 600℃ for 2 h, the resulting product was titanium dioxide-coated hollow glass microspheres.
[0031] The preparation steps of the insulation layer material are as follows: Step 1: Weigh 0.1 parts by weight of hydroxyethyl cellulose and add it to 30 parts by weight of deionized water. Stir at 500 r / min for 15 min, then add 1.1 parts by weight of dispersant, 2 parts by weight of film-forming aid and 0.5 parts by weight of defoamer. Continue stirring for 10 min. The resulting mixture is recorded as the component of the mixture. Step 2: Add 20 parts by weight of titanium dioxide-coated hollow glass microspheres and 20 parts by weight of silica aerogel to the mixture components. Stir at 1000 r / min for 30 min, then add 20 parts by weight of styrene-acrylic emulsion. Continue stirring for 10 min, then add 15 parts by weight of silica sol. Continue stirring for 20 min, then add 0.8 parts by weight of thickener and 0.3 parts by weight of defoamer. Stir at 500 r / min for 30 min to obtain the insulation layer material.
[0032] The thermal insulation and reinforcement layer material is composed of the following components: potassium hexatite whiskers, silica aerogel, wetting agent, fluorosilicone acrylic emulsion, defoamer, leveling agent, film-forming aid and thickener; The preparation steps of the thermal insulation and reinforcement layer material are as follows: Step A: Weigh 18 parts by weight of potassium hexatitanate whiskers, 12 parts by weight of silica aerogel, 1.2 parts by weight of wetting agent, 1 part by weight of silane coupling agent KH-560 and 40 parts by weight of deionized water and mix them. After ultrasonic dispersion at a frequency of 40 kHz for 30 min, the resulting mixture is recorded as the mixed solution system. Step B: Add 30 parts by weight of fluorosilicone acrylic emulsion to the mixture system and stir at a stirring speed of 500 r / min for 30 min. Then add 0.6 parts by weight of defoamer, 0.5 parts by weight of leveling agent, 2.5 parts by weight of film-forming aid and 1.5 parts by weight of thickener, and continue stirring for 10 min. The resulting material is the thermal insulation and reinforcement layer material.
[0033] The topcoat material consists of the following components: fluorocarbon resin, isocyanate curing agent, butyl acetate, propylene glycol methacrylate, fluorinated graphene, nano-silica, silane coupling agent KH-560, and butanol; The preparation method of fluorinated graphene is as follows: Weigh 0.9 parts by weight of fluorinated graphene and pour it into 1L of ethanol solution with a concentration of 10g / mL polyvinylpyrrolidone. Disperse the solution by sonication at a frequency of 40kHz for 10min, then stir at a speed of 1200r / min for 10h. Centrifuge at a speed of 5000r / min for 10min, take the supernatant, filter and wash away excess polyvinylpyrrolidone, and finally dry it in a vacuum drying oven at 60℃ for 12h. The result is fluorinated graphene.
[0034] The preparation steps for the topcoat layer material are as follows: Step I: Weigh 5 parts by weight of nano-silica and 1 part by weight of fluorinated graphene and disperse them in 25 parts by weight of anhydrous butanol. After ultrasonic dispersion at a frequency of 30 kHz for 5 min, record it as the dispersion component. Mix silane coupling agent KH-560 and deionized water at a weight ratio of 1:2 and stir at a speed of 500 r / min for 30 min, record it as the hydrolysis component. Step II: Mix the dispersion component and the hydrolysis component at a weight ratio of 1:15, stir at a stirring speed of 400 r / min for 2 h at a water bath temperature of 60℃, filter to remove the filtrate, and record the resulting particulate component. Step III: Weigh 100 parts by weight of fluorocarbon resin and 13 parts by weight of isocyanate curing agent and mix them to obtain the main component; mix 7 parts by weight of butyl acetate and 3 parts by weight of propylene glycol methacrylate to obtain the diluent component. Step IV: Mix the main component and diluent component at a weight ratio of 3:2, add a medium amount of particle component equal to 20% of the weight of the main component, stir at a stirring speed of 500 r / min for 10 min, and vacuum for 3 min to obtain the topcoat layer material.
[0035] A preparation process for a thermal insulation coating material for high-temperature pipelines, comprising the following steps: S1. After cleaning the pipe surface, apply multiple coats of primer to form a primer layer with a thickness of 0.8mm. After the primer layer cures, spray or apply multiple coats of insulation material to form an insulation layer with a thickness of 35mm. The cleaning method is as follows: the surface of the metal pipe is sandblasted or mechanically ground to remove loose rust, oil, and dust, and to make the surface of the metal pipe rough enough to facilitate the adhesion of the primer layer. S2. After the insulation layer has cured, spray or coat multiple layers of insulation reinforcement material to form a 15mm thick insulation reinforcement layer. After the insulation reinforcement layer has cured, coat multiple layers of topcoat material to form a 1mm thick topcoat layer.
[0036] Example 3 This embodiment provides a thermal insulation coating material for high-temperature pipelines. The composition of the thermal insulation coating material for high-temperature pipelines includes: a primer layer material, a thermal insulation layer material, a thermal insulation reinforcement layer material, and a topcoat layer material. The primer layer material consists of the following components: epoxy-modified silicone resin, silanized hollow ceramic microspheres, modified ground glass fiber, xylene, butanol, and dispersant; The preparation method of silanized hollow ceramic microspheres is as follows: Weigh 1 part by weight of silane coupling agent KH-550 and add it to 500 parts by weight of 90% ethanol aqueous solution. Stir at 500 r / min for 10 min, then add 50 parts by weight of hollow ceramic microspheres. Disperse the mixture ultrasonically at 300 W at 60℃ for 1 h, then place it in an oven at 120℃ for 3 h. After cooling to room temperature, grind it through a 200 mesh sieve. The result is silanized hollow ceramic microspheres. The preparation method of modified ground glass fiber is as follows: Weigh 3 parts by weight of silane coupling agent KH-550 and add it to 500 parts by weight of 90% ethanol aqueous solution. Stir at 500 r / min for 10 min, then add 50 parts by weight of ground glass fiber. Stir at 300 r / min for 30 min at 60℃ water bath temperature, then place in an oven at 120℃ for 3 h. After cooling to room temperature, grind and pass through a 200 mesh sieve. The result is modified ground glass fiber.
[0037] The preparation method of the primer layer material is as follows: Weigh out 50 parts by weight of epoxy-modified silicone resin, 13 parts by weight of silanized hollow ceramic microspheres, 7 parts by weight of modified ground glass fiber, 23 parts by weight of xylene, 7 parts by weight of butanol and 2 parts by weight of dispersant, mix them and stir at 400 r / min for 38 min to obtain the primer layer material.
[0038] The insulation layer material is composed of the following components: titanium dioxide-coated hollow glass microspheres, hydroxyethyl cellulose, dispersant, film-forming aid, defoamer, silica aerogel, styrene-acrylic emulsion, silica sol, and thickener; The preparation method of titanium dioxide coated hollow glass microspheres is as follows: Five parts by weight of hollow glass microspheres were added to 50 parts by weight of deionized water. The mixture was stirred at 400 r / min for 30 min at a constant temperature of 60℃. Seven parts by weight of 10% titanium sulfate solution were added dropwise at a low rate of 1 drop / s, while 10% sodium hydroxide solution was added dropwise to maintain the pH of the reaction system at 7. After the reaction was completed, the mixture was aged for 2 h, filtered and washed until the pH reached 7, and then dried in an oven at 105℃ to constant weight. After calcination at 600℃ for 2 h, the resulting product was titanium dioxide-coated hollow glass microspheres.
[0039] The preparation steps of the insulation layer material are as follows: Step 1: Weigh 0.1 parts by weight of hydroxyethyl cellulose and add it to 25 parts by weight of deionized water. Stir at 500 r / min for 15 min, then add 0.8 parts by weight of dispersant, 2 parts by weight of film-forming aid and 0.4 parts by weight of defoamer. Continue stirring for 10 min. The result is recorded as the mixture component. Step 2: Add 18 parts by weight of titanium dioxide-coated hollow glass microspheres and 15 parts by weight of silica aerogel to the mixture components. Stir at 1000 r / min for 30 min, then add 18 parts by weight of styrene-acrylic emulsion. Continue stirring for 10 min, then add 12 parts by weight of silica sol. Continue stirring for 20 min, then add 0.6 parts by weight of thickener and 0.2 parts by weight of defoamer. Stir at 500 r / min for 30 min to obtain the insulation layer material.
[0040] The thermal insulation and reinforcement layer material is composed of the following components: potassium hexatite whiskers, silica aerogel, wetting agent, fluorosilicone acrylic emulsion, defoamer, leveling agent, film-forming aid and thickener; The preparation steps of the thermal insulation and reinforcement layer material are as follows: Step A: Weigh 17 parts by weight of potassium hexatitanate whiskers, 10 parts by weight of silica aerogel, 0.8 parts by weight of wetting agent, 0.7 parts by weight of silane coupling agent KH-560 and 35 parts by weight of deionized water and mix them. After ultrasonic dispersion at a frequency of 40 kHz for 30 min, the resulting mixture is recorded as the mixed liquid system. Step B: Add 25 parts by weight of fluorosilicone acrylic emulsion to the mixture system and stir at 500 r / min for 30 min. Then add 0.5 parts by weight of defoamer, 0.3 parts by weight of leveling agent, 2 parts by weight of film-forming aid and 1.2 parts by weight of thickener. Continue stirring for 10 min to obtain the thermal insulation and reinforcement layer material.
[0041] The topcoat material consists of the following components: fluorocarbon resin, isocyanate curing agent, butyl acetate, propylene glycol methacrylate, fluorinated graphene, nano-silica, silane coupling agent KH-560, and butanol; The preparation method of fluorinated graphene is as follows: Weigh 0.8 parts by weight of fluorinated graphene and pour it into 1L of ethanol solution with a concentration of 10g / mL polyvinylpyrrolidone. Disperse the solution ultrasonically at a frequency of 40kHz for 10min, then stir at a speed of 1200r / min for 10h. Next, centrifuge at a speed of 5000r / min for 10min. Take the supernatant, filter it to wash away excess polyvinylpyrrolidone, and finally dry it in a vacuum drying oven at 60℃ for 12h. The result is fluorinated graphene.
[0042] The preparation steps for the topcoat layer material are as follows: Step I: Weigh 4 parts by weight of nano-silica and 0.7 parts by weight of fluorinated graphene and disperse them in 23 parts by weight of anhydrous butanol. After ultrasonic dispersion at a frequency of 30 kHz for 5 min, record it as the dispersion component. Mix silane coupling agent KH-560 and deionized water at a weight ratio of 1:2 and stir at a speed of 500 r / min for 30 min, record it as the hydrolysis component. Step II: Mix the dispersion component and the hydrolysis component at a weight ratio of 1:15, stir at a stirring speed of 400 r / min for 2 h at a water bath temperature of 60℃, filter to remove the filtrate, and record the resulting particulate component. Step III: Weigh 100 parts by weight of fluorocarbon resin and 13 parts by weight of isocyanate curing agent and mix them to obtain the main component; mix 7 parts by weight of butyl acetate and 3 parts by weight of propylene glycol methacrylate to obtain the diluent component. Step IV: Mix the main component and diluent component at a weight ratio of 3:2, add a medium amount of particle component (18% of the weight of the main component), stir at a stirring speed of 400 r / min for 10 min, and vacuum for 3 min to obtain the topcoat layer material.
[0043] A preparation process for a thermal insulation coating material for high-temperature pipelines, comprising the following steps: S1. After cleaning the pipe surface, apply multiple coats of primer to form a primer layer with a thickness of 0.7mm. After the primer layer cures, spray or apply multiple coats of insulation material to form an insulation layer with a thickness of 20mm. The cleaning method is as follows: the surface of the metal pipe is sandblasted or mechanically ground to remove loose rust, oil, and dust, and to make the surface of the metal pipe rough enough to facilitate the adhesion of the primer layer. S2. After the insulation layer has cured, spray or coat multiple layers of insulation reinforcement material to form a 10mm thick insulation reinforcement layer. After the insulation reinforcement layer has cured, coat multiple layers of topcoat material to form a 0.8mm thick topcoat layer.
[0044] Comparative Example 1 The high-temperature pipeline insulation coating material and its preparation process provided in this comparative example are roughly the same as those in Example 1. The main difference is that the silanized hollow ceramic microspheres in Example 1 are replaced with hollow glass microspheres in this comparative example.
[0045] Comparative Example 2 The high-temperature pipeline insulation coating material and its preparation process provided in this comparative example are roughly the same as those in Example 1. The main difference is that the titanium dioxide-coated hollow glass microspheres in Example 1 are replaced with hollow glass microspheres in this comparative example.
[0046] Comparative Example 3 The high-temperature pipeline insulation coating material and its preparation process provided in this comparative example are roughly the same as those in Example 1. The main difference is that the insulation reinforcement layer material in Example 1 is replaced with an insulation layer material in this comparative example.
[0047] Performance testing Metal pipes with the high-temperature pipe insulation coating materials prepared in Examples 1-3 and Comparative Examples 1-3 were labeled as Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, and Comparative Example 3, respectively. The thermal insulation performance of Examples 1-3 and Comparative Examples 1-3 was then tested using the following specific testing methods: 1. Temperature sensors were installed on the outside of both Examples 1-3 and Comparative Examples 1-3. Then, liquids with temperatures of 400°C, 500°C and 600°C were circulated in Examples 1-3 and Comparative Examples 1-3, respectively. The temperature of the outside of the pipe was detected during the liquid flow, and the data were recorded in Table 1. 2. Temperature sensors were installed on the inside of Examples 1-3 and Comparative Examples 1-3. Then, 250W infrared lamps were placed inside Examples 1-3 and Comparative Examples 1-3 for irradiation. The temperature inside the metal pipe was recorded after irradiation for 60 minutes. The data obtained are recorded in Table 1. Table 1 Performance Test Data The data in the table above shows that the metal pipes with the high-temperature pipe insulation coating material prepared in Examples 1-3 can heat up rapidly under infrared lamp irradiation, indicating that the high-temperature pipe insulation coating material has a good insulation effect. When the liquid temperature inside the metal pipe reaches 600℃, the high-temperature pipe insulation coating can play a role in heat insulation, reduce the temperature of the pipe surface, and thus significantly reduce heat loss and reduce the risk of burns.
[0048] Secondly, the total coating thicknesses of Examples 1-3 in this invention differ. Among the three, Example 2 has a thicker coating than Examples 1 and 3. Example 2 exhibits a faster heating rate inside the pipe after being irradiated by an infrared lamp, and when a high-temperature liquid flows through the pipe, it can lower the temperature of the pipe's surface. This indicates that, to a certain extent, a thicker coating provides better thermal insulation performance. Based on the above data, it is clear that the high-temperature pipe insulation coating material prepared by this invention has excellent thermal insulation performance. Therefore, the preparation process of the high-temperature pipe insulation coating material in this invention has excellent application prospects.
[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The above embodiments are merely illustrative of the technical solutions of the present invention and are not intended to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A thermal insulation coating material for high-temperature pipelines, characterized in that, The thermal insulation coating material for high-temperature pipelines comprises: primer layer material, insulation layer material, thermal insulation reinforcement layer material, and topcoat layer material; The primer layer material is composed of the following components: epoxy-modified silicone resin, silanized hollow ceramic microspheres, modified ground glass fiber, xylene, butanol, and dispersant; The insulation layer material is composed of the following components: titanium dioxide-coated hollow glass microspheres, hydroxyethyl cellulose, dispersant, film-forming aid, defoamer, silica aerogel, styrene-acrylic emulsion, silica sol, and thickener; The thermal insulation and reinforcement layer material is composed of the following components: potassium hexatite whiskers, silica aerogel, wetting agent, fluorosilicone acrylic emulsion, defoamer, leveling agent, film-forming aid and thickener; The topcoat material is composed of the following components: fluorocarbon resin, isocyanate curing agent, butyl acetate, propylene glycol methacrylate, fluorinated graphene, nano silica, silane coupling agent KH-560, and butanol.
2. The thermal insulation coating material for high-temperature pipelines according to claim 1, characterized in that, The preparation method of the silanized hollow ceramic microspheres is as follows: Weigh 1 part by weight of silane coupling agent KH-550 and add it to 500 parts by weight of 90% ethanol aqueous solution. Stir at 400-500 r / min for 10 min, then add 50 parts by weight of hollow ceramic microspheres. Disperse the mixture ultrasonically at 300W power at 60℃ for 1 h, then place it in an oven at 120℃ for 3 h. After cooling to room temperature, grind it through a 200 mesh sieve. The result is silanized hollow ceramic microspheres. The method for preparing the modified ground glass fiber is as follows: Weigh 3 parts by weight of silane coupling agent KH-550 and add it to 500 parts by weight of 90% ethanol aqueous solution. Stir at 400-500 r / min for 10 min, then add 50 parts by weight of ground glass fiber. Stir at 300-400 r / min for 30 min at 60℃ water bath temperature, then place in an oven at 120℃ for 3 h. After cooling to room temperature, grind through a 200 mesh sieve to obtain modified ground glass fiber.
3. The thermal insulation coating material for high-temperature pipelines according to claim 1, characterized in that, The preparation method of the primer layer material is as follows: Weigh out 50 parts by weight of epoxy-modified silicone resin, 10-15 parts by weight of silanized hollow ceramic microspheres, 5-8 parts by weight of modified ground glass fiber, 20-25 parts by weight of xylene, 5-8 parts by weight of butanol and 1-2 parts by weight of dispersant, and mix them. Stir at 300-400 r / min for 30-45 min to obtain the primer layer material.
4. The thermal insulation coating material for high-temperature pipelines according to claim 1, characterized in that, The preparation method of the titanium dioxide-coated hollow glass microspheres is as follows: Five parts by weight of hollow glass microspheres were added to 50 parts by weight of deionized water. The mixture was stirred at a constant temperature of 60℃ and a speed of 300-400 r / min for 30 min. Six to seven parts by weight of a 10% titanium sulfate solution were added dropwise at a low speed of 1 drop / s, while a 10% sodium hydroxide solution was added dropwise to maintain the pH of the reaction system at 7. After the reaction was completed, the mixture was aged for 2 h, filtered and washed until the pH reached 7, and then dried in an oven at 105℃ to constant weight. After calcination at 600℃ for 2 h, the resulting product was titanium dioxide-coated hollow glass microspheres.
5. The thermal insulation coating material for high-temperature pipelines according to claim 1, characterized in that, The preparation steps of the insulation layer material are as follows: Step 1: Weigh 0.1 parts by weight of hydroxyethyl cellulose and add it to 20-30 parts by weight of deionized water. Stir at 500 r / min for 15 min, then add 0.5-1.1 parts by weight of dispersant, 1-2 parts by weight of film-forming aid and 0.3-0.5 parts by weight of defoamer. Continue stirring for 10 min. The result is recorded as the mixture component. Step 2: Add 15-20 parts by weight of titanium dioxide-coated hollow glass microspheres and 10-20 parts by weight of silica aerogel to the mixture components. Stir at 1000 r / min for 30 min, then add 15-20 parts by weight of styrene-acrylic emulsion. Continue stirring for 10 min, then add 10-15 parts by weight of silica sol. Continue stirring for 20 min, then add 0.3-0.8 parts by weight of thickener and 0.1-0.3 parts by weight of defoamer. Stir at 500 r / min for 30 min to obtain the insulation layer material.
6. The thermal insulation coating material for high-temperature pipelines according to claim 1, characterized in that, The preparation steps of the thermal insulation and reinforcement layer material are as follows: Step A: Weigh 15-18 parts by weight of potassium hexatitanate whiskers, 8-12 parts by weight of silica aerogel, 0.5-1.2 parts by weight of wetting agent, 0.5-1 parts by weight of silane coupling agent KH-560 and 30-40 parts by weight of deionized water and mix them. After ultrasonic dispersion at a frequency of 40kHz for 30 minutes, the resulting mixture is recorded as the mixed solution system. Step B: Add 20-30 parts by weight of fluorosilicone acrylic emulsion to the mixture system and stir at a stirring speed of 400-500 r / min for 30 min. Then add 0.3-0.6 parts by weight of defoamer, 0.2-0.5 parts by weight of leveling agent, 1.5-2.5 parts by weight of film-forming aid and 0.8-1.5 parts by weight of thickener. Continue stirring for 10 min to obtain the thermal insulation and reinforcement layer material.
7. The thermal insulation coating material for high-temperature pipelines according to claim 1, characterized in that, The preparation method of the fluorinated graphene is as follows: Weigh 0.8-0.9 parts by weight of fluorinated graphene and pour it into 1L of ethanol solution with a concentration of 10g / mL polyvinylpyrrolidone. Disperse the solution by sonication at a frequency of 40kHz for 10min, then stir at a speed of 1200r / min for 10h. Centrifuge at a speed of 5000r / min for 10min, take the supernatant, filter and wash away excess polyvinylpyrrolidone, and finally dry it in a vacuum drying oven at 60℃ for 12h. The result is fluorinated graphene.
8. The thermal insulation coating material for high-temperature pipelines according to claim 1, characterized in that, The preparation steps of the topcoat layer material are as follows: Step I: Weigh 3-5 parts by weight of nano-silica and 0.5-1 parts by weight of fluorinated graphene and disperse them in 20-25 parts by weight of anhydrous butanol. After ultrasonic dispersion at a frequency of 30kHz for 5 minutes, record it as the dispersion component. Mix silane coupling agent KH-560 and deionized water at a weight ratio of 1:2 and stir at a speed of 400-500r / min for 30 minutes, and record it as the hydrolysis component. Step II: Mix the dispersion component and the hydrolysis component at a weight ratio of 1:15, stir at a stirring speed of 300-400 r / min for 2 hours at a water bath temperature of 60℃, filter to remove the filtrate, and record the resulting particulate component. Step III: Weigh 100 parts by weight of fluorocarbon resin and 13 parts by weight of isocyanate curing agent and mix them to obtain the main component; mix 7 parts by weight of butyl acetate and 3 parts by weight of propylene glycol methacrylate to obtain the diluent component. Step IV: Mix the main component and diluent component at a weight ratio of 3:2, add 15-20% of the particle component by weight of the main component, stir at a stirring speed of 300-500 r / min for 10 min, and vacuum for 2-3 min to obtain the topcoat layer material.
9. The preparation process of a high-temperature pipeline insulation coating material according to any one of claims 1-8, characterized in that, The preparation process includes the following steps: S1. After cleaning the pipe surface, apply multiple coats of primer to form a primer layer with a thickness of 0.5-0.8mm. After the primer layer has cured, spray or apply multiple coats of insulation material to form an insulation layer with a thickness of 5-35mm. S2. After the insulation layer has cured, spray or coat multiple layers of insulation reinforcement material to form an insulation reinforcement layer with a thickness of 5-15mm. After the insulation reinforcement layer has cured, coat multiple layers of topcoat material to form a topcoat layer with a thickness of 0.5-1mm.
10. The preparation process of a high-temperature pipeline insulation coating material according to claim 9, characterized in that, The cleaning method in S1 is to remove rust, oil, and dust from the surface of the metal pipe by sandblasting or mechanical grinding, and to make the surface of the metal pipe rough enough to facilitate the adhesion of the primer layer.