A UV-cured thermal insulation coating and a method for preparing the same

Abstract

The application discloses a kind of UV curing heat preservation coating and preparation method thereof, it is related to paint technical field.The application first with 2-ethyl-2-(mercapto methyl)-1,3-propanedithiol and pentaerythritol triallyl ether as raw material preparation UV curing coating, then join modified phase change microcapsule material as heat preservation auxiliary agent;Multi-functional group raw material can form highly crosslinked polymer network structure, improve the mechanical properties of coating after curing;Using oxidized foam metal load sugar alcohol mixture as the core material of phase change microcapsule, doped with p-fluorocinnamyl chloride modified polyamide as the shell material of phase change microcapsule, then interface polymerization method is used to prepare modified phase change microcapsule material, modified phase change material can more quickly absorb or release heat, improve the heat preservation effect, the surface of p-fluorocinnamyl chloride modified phase change microcapsule material contains double bond, can participate in curing reaction directly with resin network bonding, enhance interface strength.The UV curing heat preservation coating prepared by the application improves the heat preservation effect of coating.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of paint technology, in particular to a UV-cured thermal insulation coating and a preparation method thereof. BACKGROUND

[0002] Under the global trend of increasing environmental awareness, the paint industry is moving towards sustainability. UV coatings have been widely used in modern society due to their environmental, convenient and economic advantages. UV-cured coatings, as a type of radiation-cured coatings, refer to new types of coatings that can rapidly cross-link and cure into films under light conditions. Compared with traditional solvent-based coatings, UV-cured coatings exhibit many advantages: fast curing speed, no volatile organic solvents, low energy consumption, high cost-effectiveness, and support for automated production processes, thus being considered as a green and environmentally friendly coating option.

[0003] In the face of the reality of continued growth in energy consumption and the depletion of traditional fossil energy, the building sector, as a major energy consumer, has particularly prominent energy consumption in its heating, cooling and other operational processes. In order to address this challenge, reduce energy consumption and greenhouse gas emissions, and achieve the goal of sustainable development, it is urgent to improve the energy efficiency of buildings. In this context, thermal insulation coatings, with their effective heat transfer blocking properties, have become one of the key technical means to reduce energy loss during building use.

[0004] Therefore, it is particularly important to develop a new type of coating that combines UV curing technology and thermal insulation function. This UV-cured thermal insulation coating not only inherits the environmental characteristics of both, but also further expands its application potential in improving building energy efficiency. SUMMARY

[0005] The present application aims to provide a UV-cured thermal insulation coating and a preparation method thereof to solve the problems in the prior art.

[0006] To solve the above technical problems, the present application provides the following technical solution: a UV-cured thermal insulation coating, the UV-cured thermal insulation coating is prepared by using 2-ethyl-2-(mercaptomethyl)-1,3-propanedithiol and pentaerythritol triallyl ether as raw materials, and then adding a thermal insulation aid, a diluent, a photoinitiator, a leveling agent and a solvent.

[0007] The thermal insulation aid is a modified phase change microcapsule material; the modified phase change microcapsule material is prepared by using an oxidized foamed metal loaded sugar alcohol mixture as the core material, a fluorocinnamyl chloride modified polyamide as the shell material, and then using an interfacial polymerization method.

[0008] Further, the diluent is one of DVE-3, CHVE, HBVE or DDVE.

[0009] Further, the photoinitiator is one of 2,4,6-trimethylbenzoyl diphenyl phosphine oxide, 2,2-dimethoxy-2-phenylacetophenone or 2-hydroxy-4-methoxybenzophenone.

[0010] Further, the leveling agent is one of BYK-UV3500, BYK-UV3530 or BYK-UV3570.

[0011] Further, a preparation method of the UV curing thermal insulation coating, comprising the following preparation steps:

[0012] (1) The sugar alcohol mixture is placed in a drying oven and dried at 100-105℃ for 8-10h, then placed in a sealed box and heated to 200℃, and kept at constant temperature for 1-2h, then taken out and naturally cooled to room temperature, and then ground with a planetary ball mill at a speed of 250r / min for 15min, and then sieved through a 150 mesh sieve to obtain a pretreated sugar alcohol mixture;

[0013] (2) The pretreated sugar alcohol mixture is dissolved in deionized water with a mass of 5-10 times that of the pretreated sugar alcohol mixture, and the pretreated sugar alcohol mixture is added with an oxidized foamed metal with a mass of 0.8-1.0 times that of the pretreated sugar alcohol mixture, then stirred at 80-100℃ and 300-400r / min until the deionized water is completely evaporated, and then dried at 100℃ for 1.0-1.5h to obtain a modified phase change material;

[0014] (3) The water phase: polyethylene glycol and deionized water are mixed in a mass ratio of 0.05-0.08:1, and the modified phase change material is added with a volume of 0.03-0.05 times that of the mixed liquid, and stirred at 500-600r / min for 30-60min to obtain the water phase;

[0015] The oil phase: p-fluorocinnamoyl chloride and terephthaloyl chloride are mixed in a molar ratio of 0.1-0.3:1, and then Tween 80 is added with a mass of 0.01-0.03 times that of the terephthaloyl chloride to obtain a mixture, the mixture is dissolved in an organic solvent, and stirred at 500-600r / min for 30-60min to obtain the oil phase;

[0016] Emulsification: at 50℃, the oil phase is added to the water phase and stirred at 800-1000r / min for 20-40min to obtain a stable emulsion, and the volume ratio of the oil phase to the water phase is 1:3;

[0017] Encapsulation: at room temperature, the aqueous amine solution is added to the stable emulsion and reacted for 15-30min, then filtered and washed to obtain a modified phase change microcapsule material;

[0018] (4) mixing 20-35% 2-ethyl-2-(mercaptomethyl)-1,3-propanedithiol, 20-35% pentaerythritol triallyl ether, 3-5% modified phase change microcapsule material, 5-10% diluent, 1-5% photoinitiator, 0.3-1% leveling agent and 20-30% solvent by mass percentage to prepare a UV-cured thermal insulation coating.

[0019] Further, in the step (2), the oxidized foam metal is obtained by washing and drying the foam metal with deionized water, and then heat treating the foam metal in an air atmosphere at 500-800 DEG C for 3-5 hours and naturally cooling to room temperature, wherein the foam metal is one of foam iron, foam nickel or foam copper.

[0020] Further, in the step (3), the organic solvent is obtained by mixing cyclohexane and chloroform at a ratio of 3:2.

[0021] Further, in the step (3), the aqueous amine solution is obtained by mixing 1,6-hexanediamine and diethylenetriamine at a molar ratio of 1:1 to obtain a mixed solution, and then dissolving the mixed solution in deionized water in an amount of 2-3 times the mass of the mixed solution.

[0022] Further, the molar ratio of the 1,6-hexanediamine, diethylenetriamine and terephthaloyl chloride is 1.0-1.1:1.0-1.1:1.

[0023] Further, in the step (3), the washing is performed by alternately washing with deionized water and ethanol for 2-3 times.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] The present application uses 2-ethyl-2-(mercaptomethyl)-1,3-propanedithiol and pentaerythritol triallyl ether as raw materials to prepare a UV-cured coating, and then adds modified phase change microcapsule material as a thermal insulation aid to improve the thermal insulation effect of the coating.

[0026] Firstly, UV-curable coating is prepared with 2-ethyl-2-(mercaptomethyl)-1,3-propanedithiol and pentaerythritol triallyl ether as raw materials; the thiol-ene click reaction of 2-ethyl-2-(mercaptomethyl)-1,3-propanedithiol and pentaerythritol triallyl ether occurs under ultraviolet light, which rapidly solidifies and forms a solid coating film in a short time, thereby improving production efficiency, reducing volatile time of the coating in the curing process, reducing the impact on the environment, and the double bond on the surface of the phase change microcapsule material modified by fluorocinnamyl chloride provides active sites during ultraviolet curing, which can be directly bonded to the resin network through thiol-ene click reaction to form a "microcapsule-matrix" covalent connection, thereby enhancing the interfacial strength and further improving the mechanical properties of the coating after curing; and 2-ethyl-2-(mercaptomethyl)-1,3-propanedithiol contains multiple mercapto groups, which can form a highly cross-linked polymer network structure, and the dense polymer network can effectively prevent the penetration of external corrosive substances such as moisture, oxygen, acid and alkali into the coating film, thereby protecting the substrate from corrosion; the pentaerythritol skeleton provides rigidity, and the ethyl branch and thioether bond impart toughness, avoiding brittle cracking.

[0027] Secondly, the sugar alcohol mixture is used as the core material of the phase change microcapsule, the polyamide modified by fluorocinnamyl chloride is used as the shell material of the phase change microcapsule, and the modified phase change microcapsule material is prepared by interfacial polymerization, and the modified phase change microcapsule material is used as a heat preservation aid to prepare the UV-curable heat preservation coating; the oxide active sites on the surface of the oxidized foam metal can form hydrogen bonds with the sugar alcohol compounds, thereby more firmly loading the sugar alcohol compounds, and the foam metal has good thermal conductivity, which can effectively improve the low thermal conductivity of the sugar alcohol mixture and improve the thermal conductivity of the sugar alcohol mixture and the heat transfer efficiency during the phase change process; the encapsulation of the polyamide resin can effectively prevent the direct contact of the phase change material with the environment, thereby playing a protective role, and can also prevent the leakage of the phase change material during use, thereby further improving the heat preservation performance of the coating; the introduction of fluorine atoms into the polyamide shell material can significantly reduce the water absorption of the shell material, reduce the erosion of moisture penetration to the phase change material, avoid the rupture of the microcapsule due to moisture absorption and swelling, improve the coating effect of the polyamide shell material, delay the service life of the microcapsule material, and the fluorine group can reduce the surface energy of the shell material, reduce the adhesion between the microcapsules, and improve the dispersibility of the microcapsules in the UV-curable coating. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0029] In order to more clearly illustrate the method provided by the present application, the following embodiments are used for detailed description. In the following embodiments, the test methods of various indexes of the UV-cured thermal insulation coating prepared are as follows.

[0030] The UV-cured coatings prepared in the embodiments and the comparative examples are subjected to the following process.

[0031] The process sequence is: substrate cleaning→coating dilution→spraying→IR baking→UV curing. The specific process parameters are: the UV-cured thermal insulation coating is sprayed on the metal surface, and baked at 70℃ for 3-5min; then the UV curing machine with an energy of 1000-2100mJ / cm 2 is used to cure the UV-cured thermal insulation coating to form a coating layer. The obtained coating layer is subjected to the following performance tests.

[0032] Adhesion: the same mass of the UV-cured thermal insulation coating prepared in the embodiments and the comparative examples is tested for adhesion according to GB / T9286-1998 "Cross-hatch test method of paint and varnish film".

[0033] Hardness: the same mass of the UV-cured thermal insulation coating prepared in the embodiments and the comparative examples is tested for hardness according to GB / T6739-1996 "Pencil hardness test method".

[0034] Thermal conductivity: the same mass of the UV-cured thermal insulation coating prepared in the embodiments and the comparative examples is tested for thermal conductivity according to GB / T17371-2008 "Silicate composite thermal insulation coating".

[0035] Embodiment 1

[0036] A preparation method of a UV-cured thermal insulation coating, comprising the following preparation steps:

[0037] (1) The PPI40 foamed nickel is washed and dried with deionized water, and then heat treated at 500℃ for 3h in an air atmosphere, and naturally cooled to room temperature to obtain oxidized foamed nickel;

[0038] (2) The erythritol and mannitol are placed in a drying box at a mass ratio of 1:1, dried at 100℃ for 8h, then placed in a sealed box and heated to 200℃, kept at a constant temperature for 1h, taken out and naturally cooled to room temperature, and then ground and treated using a planetary ball mill at a rotating speed of 250r / min for 15min, and then sieved through a 150-mesh sieve to obtain a pretreated sugar alcohol mixture.

[0039] (3) dissolving the pretreated sugar alcohol mixture into deionized water with 5 times the mass of the pretreated sugar alcohol mixture, adding oxidized foamed metal with 0.8 times the mass of the pretreated sugar alcohol mixture, and then stirring at 80℃ and 300r / min until the deionized water is completely evaporated, and then drying at 100℃ for 1.0h to obtain the modified phase change material;

[0040] (4) water phase: mixing polyethylene glycol 6000 and deionized water at a mass ratio of 0.05:1, adding the modified phase change material with 0.03 times the volume of the mixed liquid, and stirring at 500r / min for 30min to obtain the water phase;

[0041] oil phase: mixing p-fluorocinnamoyl chloride and terephthaloyl chloride at a molar ratio of 0.1:1, then adding Tween 80 with 0.01 times the mass of terephthaloyl chloride to obtain a mixture, dissolving the mixture in an organic solvent, and the organic solvent is a mixture of cyclohexane and chloroform at a ratio of 3:2, stirring at 500r / min for 30min to obtain the oil phase;

[0042] emulsification: at 50℃ and 800r / min, the oil phase is added to the water phase, and stirred for 20min to obtain a stable emulsion, and the volume ratio of the oil phase to the water phase is 1:3;

[0043] encapsulation: mixing 1,6-hexanediamine and diethylenetriamine at a molar ratio of 1:1 to obtain a mixed liquid, then dissolving the mixed liquid in deionized water with 2 times the mass of the mixed liquid to obtain an aqueous amine solution, and then adding the aqueous amine solution to the stable emulsion at room temperature and 600r / min, and reacting for 15min, and then filtering and washing with deionized water and ethanol alternately for 2 times to obtain the modified phase change microcapsule material, and the molar ratio of 1,6-hexanediamine, diethylenetriamine and terephthaloyl chloride is 1.0:1.0:1;

[0044] (5) mixing 30% 2-ethyl-2-(mercaptomethyl)-1,3-propanedithiol, 30% pentaerythritol triallyl ether, 3% modified phase change microcapsule material, 5% DVE-3 diluent, 3% 2,4,6-trimethylbenzoyl diphenyl phosphine oxide photoinitiator, 0.3% BYK-UV3500 leveling agent and 28.7% solvent to obtain a UV-curable thermal insulation coating, and the solvent is a mixture of acetone and toluene at a volume ratio of 3:1.

[0045] Example 2

[0046] A preparation method of a UV-curable thermal insulation coating, comprising the following preparation steps:

[0047] (1) washing and drying the PPI40 foamed nickel with deionized water, and then heat treating at 700℃ in air atmosphere for 4h, and then naturally cooling to room temperature to obtain oxidized foamed nickel;

[0048] (2) The erythritol and mannitol were placed in a drying oven at a mass ratio of 1:1, dried at 100℃ for 9h, then placed in a sealed box and heated to 200℃, kept at constant temperature for 2h, taken out and naturally cooled to room temperature, then ground with a planetary ball mill at a speed of 250r / min for 15min, and sieved through a 150-mesh sieve to obtain a pretreated sugar alcohol mixture;

[0049] (3) The pretreated sugar alcohol mixture was dissolved in deionized water at 8 times the mass of the pretreated sugar alcohol mixture, and 0.9 times the mass of the pretreated sugar alcohol mixture of oxidized foamed metal was added, then stirred at 90℃ and 350r / min until the deionized water was completely evaporated, and dried at 100℃ for 1.0h to obtain a modified phase change material;

[0050] (4) Water phase: polyethylene glycol 6000 and deionized water were mixed at a mass ratio of 0.06:1, and 0.04 times the volume of the mixed liquid of the modified phase change material was added, and stirred at 550r / min for 45min to obtain the water phase;

[0051] Oil phase: p-fluorocinnamoyl chloride and terephthaloyl chloride were mixed at a molar ratio of 0.2:1, and 0.02 times the mass of the terephthaloyl chloride of Tween 80 was added to obtain a mixture, which was dissolved in an organic solvent, and the organic solvent was cyclohexane and chloroform mixed at a ratio of 3:2 to prepare an oil phase, which was stirred at 550r / min for 45min;

[0052] Emulsification: at 50℃ and 900r / min, the oil phase was added to the water phase and stirred for 30min to obtain a stable emulsion, and the volume ratio of the oil phase to the water phase was 1:3;

[0053] Encapsulation: 1,6-hexanediamine and diethylenetriamine were mixed at a molar ratio of 1:1 to obtain a mixed liquid, which was dissolved in deionized water at 3 times the mass of the mixed liquid to prepare an aqueous amine solution, and the aqueous amine solution was added to the stable emulsion at room temperature and 600r / min, and reacted for 25min, then filtered and washed with deionized water and ethanol alternately for 3 times to obtain a modified phase change microcapsule material, wherein the molar ratio of 1,6-hexanediamine, diethylenetriamine and terephthaloyl chloride was 1.1:1.0:1;

[0054] (5) UV-curable thermal insulation coating was prepared by mixing 32% 2-ethyl-2-(mercaptomethyl)-1,3-propanedithiol, 32% pentaerythritol triallyl ether, 4% modified phase change microcapsule material, 8% DVE-3 diluent, 3% 2,4,6-trimethylbenzoyl diphenyl phosphine oxide photoinitiator, 0.8% BYK-UV3500 leveling agent and 20.2% solvent, and the solvent was acetone and toluene mixed at a volume ratio of 3:1.

[0055] Example 3

[0056] A preparation method of a UV-cured thermal insulation coating, comprising the following preparation steps:

[0057] (1) After the PPI40 foamed nickel is washed and dried with deionized water, it is heat treated at 800℃ for 5h in an air atmosphere, and naturally cooled to room temperature to obtain an oxidized foamed nickel;

[0058] (2) Erythritol and mannitol are placed in a drying oven at a mass ratio of 1:1, dried at 105℃ for 10h, then placed in a sealed box and heated to 200℃, kept at a constant temperature for 2h, taken out and naturally cooled to room temperature, then ground with a planetary ball mill at a rotating speed of 250r / min for 15min, and sieved through a 150-mesh sieve to obtain a pretreated sugar alcohol mixture;

[0059] (3) The pretreated sugar alcohol mixture is dissolved in deionized water with a mass of 10 times that of the pretreated sugar alcohol mixture, and the pretreated sugar alcohol mixture with a mass of 1 times that of the pretreated sugar alcohol mixture is added, then stirred at 100℃ and 400r / min until the deionized water is completely evaporated, and dried at 100℃ for 1.5h to obtain a modified phase change material;

[0060] (4) Water phase: polyethylene glycol 6000 and deionized water are mixed at a mass ratio of 0.08:1, and the modified phase change material with a volume of 0.05 times that of the mixed liquid is added, and stirred at 600r / min for 60min to obtain the water phase;

[0061] Oil phase: p-fluorocinnamoyl chloride and terephthaloyl chloride are mixed at a molar ratio of 0.3:1, and then the mixed liquid is dissolved in an organic solvent, and the organic solvent is cyclohexane and chloroform mixed at a ratio of 3:2 to prepare the oil phase, and stirred at 600r / min for 60min to obtain the oil phase;

[0062] Emulsification: at 50℃ and 1000r / min, the oil phase is added to the water phase, and stirred for 40min to obtain a stable emulsion, and the volume ratio of the oil phase to the water phase is 1:3;

[0063] Encapsulation: 1,6-hexanediamine and diethylenetriamine are mixed at a molar ratio of 1:1 to obtain a mixed liquid, and then the mixed liquid is dissolved in deionized water with a mass of 3 times that of the mixed liquid to prepare an aqueous amine solution, and the aqueous amine solution is added to the stable emulsion at room temperature and 600r / min, and reacted for 30min, then filtered and washed with deionized water and ethanol alternately for 3 times to obtain a modified phase change microcapsule material, and the molar ratio of 1,6-hexanediamine, diethylenetriamine and terephthaloyl chloride is 1.1:1.1:1;

[0064] (5) UV-curable thermal insulation coating was prepared by mixing 30% 2-ethyl-2-(mercaptomethyl)-1,3-propanedithiol, 30% pentaerythritol triallyl ether, 5% modified phase change microcapsule material, 10% DVE-3 diluent, 5% 2,4,6-trimethylbenzoyl diphenylphosphine oxide photoinitiator, 1% BYK-UV3500 leveling agent and 19% solvent by mass percentage, wherein the solvent is a mixture of acetone and toluene with a volume ratio of 3:1.

[0065] Comparative Example 1

[0066] Comparative Example 1 differs from Example 2 in that step (4) is different, 2-ethyl-2-(mercaptomethyl)-1,3-propanedithiol in step (5) is replaced by 1,2-ethanedithiol; the remaining steps are the same as Example 2.

[0067] Comparative Example 2

[0068] Comparative Example 2 differs from Example 2 in that step (2) is different, pentaerythritol triallyl ether in step (5) is replaced by diallyl ether; the remaining steps are the same as Example 2.

[0069] Comparative Example 3

[0070] Comparative Example 3 differs from Example 2 in that there is no step (1), and the oxidized foamed metal in step (3) is replaced by foamed metal; the remaining steps are the same as Example 2.

[0071] Comparative Example 4

[0072] Comparative Example 4 differs from Example 2 in that there are no steps (1) and (3), and the modified phase change material in step (4) is replaced by a pretreated sugar alcohol mixture; the remaining steps are the same as Example 2.

[0073] Comparative Example 5

[0074] Comparative Example 5 differs from Example 2 in that step (4) is different, and p-fluorocinnamoyl chloride in step (4) is deleted; the remaining steps are the same as Example 2.

[0075] Comparative Example 6

[0076] Comparative Example 6 differs from Example 2 in that there is no step (4), and the modified phase change microcapsule material in step (5) is replaced by a modified phase change material; the remaining steps are the same as Example 2.

[0077] Effect Example

[0078] The performance analysis results of the UV-curable thermal insulation coatings of Examples 1 to 3 and Comparative Examples 1 to 6 of the present application are given in Table 1 below.

[0079] Table 1

[0080] adhesion / grade hardness / h thermal conductivity (w / m*k) example 1 0 5 0.21 example 2 0 5 0.23 example 3 0 5 0.22 comparative example 1 2 2 0.26 comparative example 2 2 2 0.25 comparative example 3 0 5 0.35 comparative example 4 0 5 0.41 comparative example 5 1 3 0.32 comparative example 6 0 5 0.48

[0081] From the comparison of the experimental data of Example 2 and Comparative Examples 1-2, it can be found that the present application uses 2-ethyl-2-(mercaptomethyl)-1,3-propanedithiol and pentaerythritol triallyl ether as raw materials to prepare UV-curable coatings; the thiol-ene click reaction of 2-ethyl-2-(mercaptomethyl)-1,3-propanedithiol and pentaerythritol triallyl ether occurs under ultraviolet light, which rapidly solidifies and forms a solid coating film in a short time, thereby improving production efficiency, reducing volatile time of the coating during curing, and reducing environmental impact. At the same time, the heat preservation aid contains double bonds on the surface of the phase change microcapsule material modified by fluorocinnamyl chloride, which also provides active sites during UV curing, and can be directly bonded to the resin network through thiol-ene click reaction, forming a "microcapsule-matrix" covalent connection to enhance the interfacial strength and further improve the mechanical properties of the coating after curing. In addition, 2-ethyl-2-(mercaptomethyl)-1,3-propanedithiol contains multiple mercapto groups, which can form a highly cross-linked polymer network structure. The dense polymer network can effectively prevent the penetration of external corrosive substances such as moisture, oxygen, acid and alkali into the coating film, thereby protecting the substrate from corrosion. The pentaerythritol skeleton provides rigidity, and the ethyl branch and thioether bond impart toughness, avoiding brittle cracking. From the comparison of the experimental data of Example 2 and Comparative Examples 3-4, it can be found that the present application uses oxidized foam metal to load the phase change material, and the surface of the oxidized foam metal has active sites of oxides, which can form hydrogen bonds with sugar alcohol compounds, thereby more firmly loading the sugar alcohol compounds. In addition, the foam metal has good thermal conductivity, which can effectively improve the low thermal conductivity of the sugar alcohol mixture after loading, improve the thermal conductivity of the sugar alcohol mixture and the heat transfer efficiency during the phase change process, and when the environmental temperature changes, the modified phase change material can more quickly absorb or release heat, achieve more efficient phase change, and improve the heat preservation effect. From the comparison of the experimental data of Example 2 and Comparative Example 5, it can be found that the present application dopes p-fluorocinnamyl chloride modified polyamide as the shell material of the phase change microcapsule, which introduces fluorine atoms into the polyamide shell material. The strong hydrophobicity of fluorine atoms can significantly reduce the water absorption of the shell material, reduce the erosion of moisture penetration to the phase change material, avoid the rupture of the microcapsule due to moisture swelling, improve the coating effect of the polyamide shell material, delay the service life of the microcapsule material, and the fluorine group can reduce the surface energy of the shell material, reduce the adhesion between the microcapsules, and improve the dispersibility of the microcapsules in the UV-curable coating. From the comparison of the experimental data of Example 2 and Comparative Example 6, it can be found that the present application uses polyamide resin to encapsulate the modified phase change material, which can effectively prevent the direct contact of the phase change material with the environment, play a protective role, and also prevent the leakage of the phase change material during use, thereby further improving the heat preservation performance of the coating.

[0082] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference herein to any prior art is to be taken as an admission that the present application is not entitled to antedate such prior art by virtue of prior application. Any reference to the term "comprising" is to be construed in accordance with the definition of that term provided in the preamble to Article 69 of the European Patent Convention. Any reference to the term "comprising" is to be construed in accordance with the definition of that term provided in the preamble to Article 69 of the European Patent Convention.

Claims

1. A UV-cured thermal barrier coating, characterized in that, The UV curing thermal insulation coating is prepared from 2-ethyl-2-(mercaptomethyl)-1,3-propanedithiol and pentaerythritol triallyl ether as raw materials, and by adding a thermal insulation aid, a diluent, a photoinitiator, a leveling agent and a solvent; The thermal insulation aid is a modified phase change microcapsule material; The modified phase change microcapsule material is prepared by using an oxidized foamed metal loaded sugar alcohol mixture as a core material, a fluorocinnamyl chloride modified polyamide as a shell material, and an interfacial polymerization method.

2. The UV-cured thermal barrier coating of claim 1, wherein, The diluent is one of DVE-3, CHVE, HBVE or DDVE.

3. The UV-cured thermal barrier coating of claim 2, wherein, The photoinitiator is one of 2,4,6-trimethylbenzoyl diphenyl phosphine oxide, 2,2-dimethoxy-2-phenylacetophenone or 2-hydroxy-4-methoxybenzophenone.

4. The UV-cured thermal barrier coating of claim 3, wherein, The leveling agent is one of BYK-UV3500, BYK-UV3530 or BYK-UV3570.

5. A method for preparing a UV-curable thermal barrier coating, characterized in that The preparation steps include: (1) The sugar alcohol mixture is placed in a drying oven and dried at 100-105℃ for 8-10h, then placed in a sealed box and heated to 200℃, kept at constant temperature for 1-2h, taken out and naturally cooled to room temperature, then ground with a planetary ball mill at a speed of 250r / min for 15min, and sieved through a 150 mesh screen to obtain a pretreated sugar alcohol mixture; (2) The pretreated sugar alcohol mixture is dissolved in deionized water in an amount of 5-10 times the mass of the pretreated sugar alcohol mixture, and the oxidized foamed metal is added in an amount of 0.8-1.0 times the mass of the pretreated sugar alcohol mixture, then stirred at 80-100℃ and 300-400r / min until the deionized water is completely evaporated, and dried at 100℃ for 1.0-1.5h to obtain a modified phase change material; (3) Water phase: polyethylene glycol and deionized water are mixed in a mass ratio of 0.05-0.08:1, and the modified phase change material is added in an amount of 0.03-0.05 times the volume of the mixed solution, and stirred at 500-600r / min for 30-60min to obtain the water phase; Oil phase: p-fluorocinnamyl chloride and terephthaloyl chloride are mixed in a molar ratio of 0.1-0.3:1, and Tween 80 is added in an amount of 0.01-0.03 times the mass of the terephthaloyl chloride to obtain a mixture, which is dissolved in an organic solvent and stirred at 500-600r / min for 30-60min to obtain the oil phase; Emulsification: the oil phase is added to the water phase at 50℃ and 800-1000r / min, and stirred for 20-40min to obtain a stable emulsion, and the volume ratio of the oil phase to the water phase is 1:3; Capsulation: an aqueous amine solution is added to the stable emulsion at room temperature and 600r / min, and reacted for 15-30min, then filtered and washed to obtain the modified phase change microcapsule material; (4) 20-35% 2-ethyl-2-(mercaptomethyl)-1,3-propanedithiol, 20-35% pentaerythritol triallyl ether, 3-5% modified phase change microcapsule material, 5-10% diluent, 1-5% photoinitiator, 0.3-1% leveling agent and 20-30% solvent are mixed in a mass percentage to obtain the UV curing thermal insulation coating.

6. The method of claim 5, wherein the UV-curable thermal barrier coating is prepared by the steps of: The step (2) is that the foamed metal is washed with deionized water and dried, and then heated at 500-800 DEG C for 3-5 hours in air atmosphere and naturally cooled to room temperature.

7. The method for preparing a UV-curable thermal insulation coating according to claim 5, characterized in that, The step (3) is that the organic solvent is prepared by mixing cyclohexane and chloroform at a ratio of 3:

2.

8. The method for preparing a UV-curable thermal insulation coating according to claim 5, characterized in that, The step (3) is that the aqueous amine solution is prepared by mixing 1,6-hexanediamine and diethylenetriamine at a ratio of 1:1, and then dissolving the mixture in deionized water in an amount of 2-3 times the mass of the mixture.

9. The method for preparing a UV-curable thermal insulation coating according to claim 8, characterized in that, The ratio of 1,6-hexanediamine, diethylenetriamine and terephthaloyl chloride is 1.0-1.1:1.0-1.1:

1.

10. The method for preparing a UV-curable thermal insulation coating according to claim 5, characterized in that, The step (3) is that the washing is performed by alternately washing with deionized water and ethanol for 2-3 times.