EB-cured fluorocarbon resin sand-sensitive coating and preparation method thereof
Patent Information
- Application Number
- CN202611136565.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-29
- Publication Date
- 2026-11-03
AI Technical Summary
In existing EB-cured coatings, commercially available FEVE-type fluorocarbon resins are difficult to participate in free radical crosslinking, resulting in poor coating density. Furthermore, the coating performance deteriorates after the addition of matting powder, making it impossible to achieve high hydrophobicity and abrasion resistance.
By synergistically compounding modified fluorocarbon resin and sand-sensitive resin, EB curing active double bonds are introduced, and a micro-nano uneven structure is formed on the coating surface, forming a dense interpenetrating covalent cross-linked network, thereby improving the hydrophobicity and wear resistance of the coating.
It significantly improves the density and surface hardness of the coating, increases the water contact angle to 118-123°, and greatly enhances the wear resistance, achieving a combination of high hydrophobicity and high wear resistance.
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of functional coatings technology, specifically relating to an EB-cured fluorocarbon resin sand-feel coating and its preparation method. Background Technology
[0002] Compared with traditional thermosetting and UV curing technologies, EB curing has significant advantages such as no solvent evaporation, no environmental pollution, fast curing speed, no need for photoinitiators, and strong penetration ability. Fluorocarbon resins, due to the high bond energy CF chemical bonds in their molecular chains, possess extremely low surface energy, excellent weather resistance, chemical corrosion resistance, hydrophobic and oleophobic properties, stain resistance, and abrasion stability, making them the core functional resins for high-end long-lasting protective coatings.
[0003] Currently, the industry typically uses commercially available general-purpose FEVE-type fluorocarbon resins as inert functional fillers to prepare EB-cured coatings through physical blending of acrylic reactive monomers. However, commercially available FEVE-type fluorocarbon resins are designed specifically for thermosetting systems. Their molecular chains lack the active double bonds required for EB curing, resulting in a very limited number of free radical reaction sites. Furthermore, the fluorocarbon segments are highly inert and sterically hindered. During EB irradiation, the fluorocarbon resin struggles to participate in free radical cross-linking reactions, existing only as a physical filler in the coating. This leads to uneven cross-linking reactions, slow curing rates, incomplete curing at low irradiation doses, and easy resin segment cleavage at high irradiation doses. Ultimately, the coating film exhibits numerous residual pores, easily generating structural defects such as pinholes and shrinkage cavities, significantly reducing coating density and resulting in weak overall protective performance. Additionally, to achieve a matte finish on the coating surface, existing technologies require the addition of significant amounts of silica powder and other matting agents. However, excessive matting agents degrade the overall performance of the coating, affecting its hydrophobicity, hardness, and abrasion resistance.
[0004] In recent years, although some studies have attempted to modify FEVE-type fluorocarbon resins by EB curing, the modified fluorocarbon resins in the existing technology are only used as a single functional component. The coating surface is smooth and has no microscopic rough morphology. It relies solely on the low surface energy of the intrinsic CF of fluorocarbon to achieve basic hydrophobicity and stain resistance. The water contact angle is generally less than 95°, and the self-cleaning performance is poor. At the same time, the surface cross-linking rigidity of fluorocarbon resin is insufficient, the coating has low pencil hardness, weak abrasion resistance and scratch resistance, and is very easy to produce surface scratches. Summary of the Invention
[0005] The purpose of this invention is to provide an EB-cured fluorocarbon resin sand-feel coating and its preparation method. By synergistically compounding a self-made modified fluorocarbon resin with a sand-feel resin, the technical problems of poor hydrophobicity and poor wear and scratch resistance of existing EB coatings are solved.
[0006] The objective of this invention can be achieved through the following technical solutions: An EB-cured fluorocarbon resin sand-feel coating comprises the following raw materials in parts by weight: 10-30 parts modified fluorocarbon resin, 20-30 parts sand-feeling resin, 20-30 parts polyurethane resin, 10-20 parts isodecyl acrylate, 10-20 parts 1,6-hexanediol diacrylate, 2 parts leveling agent and 0.5 parts defoamer. The modified fluorocarbon resin is prepared by the following method: FEVE-type fluorocarbon resin was added to dry ethyl acetate and stirred at room temperature until the resin was completely dissolved. Then, 1,4-butanediol, catalyst, and polymerization inhibitor were added sequentially and stirred until evenly dispersed. After the temperature was raised to 60℃ and stabilized, diisocyanate was slowly added dropwise through a dropping funnel for 20 minutes. The reaction was maintained until the free -NCO content was 1.5-1.55%, indicating that the addition reaction between diisocyanate and the hydroxyl groups of the fluorocarbon resin was complete. Then, hydroxypropyl acrylate was slowly added dropwise, controlling the dropping rate to avoid excessively high local concentrations. The reaction was maintained until the -NCO content approached 0, confirming that the end-capping reaction was complete. Finally, ethyl acetate was removed using a rotary evaporator at 35-40℃ and a vacuum of 0.05-0.07 MPa to obtain the modified fluorocarbon resin. The sand-sensitive resin is prepared by the following method: Adipic acid polyester diol was vacuum dehydrated at 100℃ for 1 hour, cooled, and then diisocyanate was added. The temperature was raised to 80℃ and kept at that temperature for 4 hours. The addition reaction between diisocyanate and the hydroxyl groups of the diol was completed. After cooling, hydroxy acrylate and polymerization inhibitor were slowly added dropwise and stirred until homogeneous. Then, a catalyst was added and stirred until homogeneous. The temperature was raised to 60℃ and kept at that temperature for 3 hours. After cooling to room temperature, a sand-like resin that can be cured under a 172nm excimer lamp was obtained.
[0007] Furthermore, the ratio of the FEVE-type fluorocarbon resin, ethyl acetate, 1,4-butanediol, catalyst, polymerization inhibitor, diisocyanate, and hydroxypropyl acrylate is 10g:15g:20g:20mg:30mg:1.26-1.97g:0.98g.
[0008] Furthermore, the ratio of adipate polyester diol, diisocyanate, hydroxy acrylate, polymerization inhibitor and catalyst is 500g: 220-335g: 140-163g: 0.9-1g: 0.1g.
[0009] Furthermore, the diisocyanate is any one of isophorone diisocyanate, hexamethylene diisocyanate, and 4,4'-dicyclohexylmethane diisocyanate.
[0010] Furthermore, the catalyst is stannous octoate; the polymerization inhibitor is hydroquinone.
[0011] Furthermore, the hydroxyacrylate is hydroxyethyl acrylate or hydroxyethyl methacrylate.
[0012] Furthermore, the polyurethane resin is a hexafunctional polyurethane resin of Lankeluo L-6600; the leveling agent is BYK-3500; and the defoamer is BYK-A530.
[0013] A method for preparing an EB-cured fluorocarbon resin sand-feel coating includes the following steps: Weigh the modified fluorocarbon resin, sand-feel resin, polyurethane resin, isodecyl acrylate, 1,6-hexanediol diacrylate, leveling agent and defoamer according to the formula ratio, and disperse them at 300-600 rpm for 20-40 min to obtain EB-cured fluorocarbon resin sand-feel coating.
[0014] Beneficial effects: This invention modifies commercial FEVE-type fluorocarbon resin by isocyanate addition and hydroxypropyl acrylate double bond capping, successfully introducing EB-curable active double bonds into the fluorocarbon resin molecular chain. The modified fluorocarbon resin can participate in the free radical crosslinking reaction throughout the process under EB irradiation, forming a covalent crosslinking network with the reactive diluent monomer and sand-sensitive resin in the system, significantly improving the crosslinking density and coating compactness of the system, and effectively solving the technical defects of traditional commercial FEVE-type fluorocarbon resin that cannot participate in EB crosslinking and can only physically fill the film.
[0015] The sand-like resin of this invention undergoes controllable micro-phase separation during the 172nm excimer lamp curing stage, forming a uniform and dense micro-nano rough structure on the coating surface, producing a sand-like effect. Simultaneously, the low surface energy CF segments of the modified fluorocarbon resin are directionally enriched on the surface of the micro-nano structure. The precise coupling of the two generates a strong hydrophobic effect, stably trapping interfacial air and steadily increasing the water contact angle of the coating to 118-123°, which is a significant improvement compared to a single fluorocarbon coating. In addition, after curing, the sand-like resin forms a high-density and high-rigidity cross-linked skeleton, which serves as a mechanical reinforcing phase on the coating surface, precisely compensating for the inherent shortcomings of the fluorocarbon resin surface being relatively soft and having weak wear resistance. The two types of resins form a dense interpenetrating covalent cross-linked network, synergistically improving the overall surface hardness, scratch resistance, and friction wear resistance of the coating, achieving a combination of high hydrophobicity and high wear resistance. Detailed Implementation
[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0017] Example 1
[0018] This embodiment provides a modified fluorocarbon resin, which is prepared through the following steps: 10g of commercially available FEVE-type fluorocarbon resin and 15g of dry ethyl acetate were added to a dry single-necked flask. The mixture was stirred at room temperature until the resin was completely dissolved and became transparent and homogeneous. Then, 20g of 1,4-butanediol, 20mg of stannous octoate, and 30mg of hydroquinone were added sequentially and stirred until evenly dispersed. The temperature was raised to 60℃ and stabilized. Then, 1.67g of isophorone diisocyanate was slowly added dropwise through a dropping funnel, with the addition time controlled at 20min. The reaction was maintained until the free -NCO content was 1.5-1.55%. Then, 0.98g of hydroxypropyl acrylate was slowly added dropwise, and the reaction was maintained until the -NCO content approached 0. Finally, ethyl acetate was removed using a rotary evaporator at 35℃ and a vacuum of 0.05MPa to obtain the modified fluorocarbon resin.
[0019] Example 2
[0020] This embodiment provides a modified fluorocarbon resin, which is prepared through the following steps: 10g of commercially available FEVE-type fluorocarbon resin and 15g of dry ethyl acetate were added to a dry single-necked flask. The mixture was stirred at room temperature until the resin was completely dissolved and became transparent and homogeneous. Then, 20g of 1,4-butanediol, 20mg of stannous octoate, and 30mg of hydroquinone were added sequentially and stirred until evenly dispersed. The temperature was raised to 60℃ and stabilized. Then, 1.26g of hexamethylene diisocyanate was slowly added dropwise through a dropping funnel over a period of 20 minutes. The reaction was maintained until the free -NCO content was 1.5-1.55%. Then, 0.98g of hydroxypropyl acrylate was slowly added dropwise, and the reaction was maintained until the -NCO content approached 0. Finally, ethyl acetate was removed using a rotary evaporator at 38℃ and a vacuum of 0.06MPa to obtain the modified fluorocarbon resin.
[0021] Example 3
[0022] This embodiment provides a modified fluorocarbon resin, which is prepared through the following steps: 10g of commercially available FEVE-type fluorocarbon resin and 15g of dry ethyl acetate were added to a dry single-necked flask. The mixture was stirred at room temperature until the resin was completely dissolved and became transparent and homogeneous. Then, 20g of 1,4-butanediol, 20mg of stannous octoate, and 30mg of hydroquinone were added sequentially and stirred until evenly dispersed. The temperature was raised to 60℃ and stabilized. Then, 1.97g of 4,4'-dicyclohexylmethane diisocyanate was slowly added dropwise through a dropping funnel over a period of 20 minutes. The reaction was maintained until the free -NCO content was 1.5-1.55%. Then, 0.98g of hydroxypropyl acrylate was slowly added dropwise, and the reaction was maintained until the -NCO content approached 0. Finally, ethyl acetate was removed using a rotary evaporator at 40℃ and a vacuum of 0.07MPa to obtain the modified fluorocarbon resin.
[0023] Example 4
[0024] This embodiment provides a sand-like resin, which is prepared through the following steps: 500g of adipic acid polyester diol (Huada Chemical CMA44-800) was vacuum dehydrated at 100℃ for 1h. After cooling, 280g of isoflurane diisocyanate was added, and the temperature was slowly raised to 80℃ and kept at that temperature for 4h. After cooling, 140g of hydroxyethyl acrylate and 0.9g of hydroquinone were slowly added dropwise and stirred until homogeneous. Then, 0.1g of stannous octoate was added and stirred until homogeneous. The temperature was slowly raised to 60℃ and kept at that temperature for 3h. After cooling to room temperature, the sand-like resin was obtained.
[0025] Example 5
[0026] This embodiment provides a sand-like resin, which is prepared through the following steps: 500g of adipate polyester diol (Huada Chemical CMA44-800) was vacuum dehydrated at 100℃ for 1h. After cooling, 220g of hexamethylene diisocyanate was added, and the temperature was slowly raised to 80℃ and kept at that temperature for 4h. After cooling, 140g of hydroxyethyl acrylate and 0.9g of hydroquinone were slowly added dropwise and stirred until homogeneous. Then, 0.1g of stannous octoate was added and stirred until homogeneous. The temperature was slowly raised to 60℃ and kept at that temperature for 3h. After cooling to room temperature, the sand-like resin was obtained.
[0027] Example 6
[0028] This embodiment provides a sand-like resin, which is prepared through the following steps: 500g of adipic acid polyester diol (Huada Chemical CMA44-800) was vacuum dehydrated at 100℃ for 1h. After cooling, 335g of 4,4'-dicyclohexylmethane diisocyanate was added, and the temperature was slowly raised to 80℃ and kept at that temperature for 4h. After cooling, 140g of hydroxyethyl acrylate and 1g of hydroquinone were slowly added dropwise and stirred until homogeneous. Then, 0.1g of stannous octoate was added and stirred until homogeneous. The temperature was slowly raised to 60℃ and kept at that temperature for 3h. After cooling to room temperature, the sand-like resin was obtained.
[0029] Example 7
[0030] This embodiment provides a sand-like resin, which is prepared through the following steps: 500g of adipic acid polyester diol (Huada Chemical CMA44-800) was vacuum dehydrated at 100℃ for 1h. After cooling, 280g of isoflurane diisocyanate was added, and the temperature was slowly raised to 80℃ and kept at that temperature for 4h. After cooling, 163g of hydroxyethyl methacrylate and 1g of hydroquinone were slowly added dropwise and stirred until homogeneous. Then, 0.1g of stannous octoate was added and stirred until homogeneous. The temperature was slowly raised to 60℃ and kept at that temperature for 3h. After cooling to room temperature, the sand-like resin was obtained.
[0031] Example 8
[0032] This embodiment provides an EB-cured fluorocarbon resin sand-feel coating, which is prepared by the following method: Weigh 30 parts of the modified fluorocarbon resin prepared in Example 1, 20 parts of the sand-feel resin prepared in Example 4, 30 parts of the hexafunctional polyurethane resin (Lankel L-6600), 10 parts of isodecanyl acrylate, 10 parts of 1,6-hexanediol diacrylate, 2 parts of BYK-3500 leveling agent and 0.5 parts of BYK-A530 defoamer, and disperse them at 300 rpm for 40 min to obtain EB-cured fluorocarbon resin sand-feel coating.
[0033] Example 9
[0034] This embodiment provides an EB-cured fluorocarbon resin sand-feel coating, which is prepared by the following method: Weigh 10 parts of the modified fluorocarbon resin prepared in Example 2, 20 parts of the sand-feel resin prepared in Example 4, 30 parts of the hexafunctional polyurethane resin (Lankel L-6600), 10 parts of isodecanyl acrylate, 10 parts of 1,6-hexanediol diacrylate, 2 parts of BYK-3500 leveling agent and 0.5 parts of BYK-A530 defoamer, and disperse them at 400 rpm for 40 min to obtain EB-cured fluorocarbon resin sand-feel coating.
[0035] Example 10
[0036] This embodiment provides an EB-cured fluorocarbon resin sand-feel coating, which is prepared by the following method: Weigh 20 parts of the modified fluorocarbon resin prepared in Example 3, 20 parts of the sand-feel resin prepared in Example 4, 30 parts of the hexafunctional polyurethane resin (Lankel L-6600), 10 parts of isodecanyl acrylate, 20 parts of 1,6-hexanediol diacrylate, 2 parts of BYK-3500 leveling agent and 0.5 parts of BYK-A530 defoamer, and disperse them at 400 rpm for 30 min to obtain EB-cured fluorocarbon resin sand-feel coating.
[0037] Example 11
[0038] This embodiment provides an EB-cured fluorocarbon resin sand-feel coating, which is prepared by the following method: Weigh 30 parts of the modified fluorocarbon resin prepared in Example 1, 20 parts of the sand-feel resin prepared in Example 5, 30 parts of the hexafunctional polyurethane resin (Lankel L-6600), 10 parts of isodecanyl acrylate, 10 parts of 1,6-hexanediol diacrylate, 2 parts of BYK-3500 leveling agent and 0.5 parts of BYK-A530 defoamer, and disperse them at 500 rpm for 30 min to obtain EB-cured fluorocarbon resin sand-feel coating.
[0039] Example 12
[0040] This embodiment provides an EB-cured fluorocarbon resin sand-feel coating, which is prepared by the following method: Weigh 10 parts of the modified fluorocarbon resin prepared in Example 1, 30 parts of the sand-feel resin prepared in Example 6, 30 parts of the hexafunctional polyurethane resin (Lankel L-6600), 20 parts of isodecanyl acrylate, 10 parts of 1,6-hexanediol diacrylate, 2 parts of BYK-3500 leveling agent and 0.5 parts of BYK-A530 defoamer, and disperse them at 500 rpm for 30 min to obtain EB-cured fluorocarbon resin sand-feel coating.
[0041] Example 13
[0042] This embodiment provides an EB-cured fluorocarbon resin sand-feel coating, which is prepared by the following method: Weigh 20 parts of the modified fluorocarbon resin prepared in Example 1, 20 parts of the sand-feel resin prepared in Example 7, 30 parts of the hexafunctional polyurethane resin (Lankel L-6600), 10 parts of isodecanyl acrylate, 20 parts of 1,6-hexanediol diacrylate, 2 parts of BYK-3500 leveling agent and 0.5 parts of BYK-A530 defoamer, and disperse them at 600 rpm for 20 min to obtain EB-cured fluorocarbon resin sand-feel coating.
[0043] Comparative Example 1 This comparative example provides a common EB-cured coating, which is prepared by the following method: Weigh out 30 parts of commercially available ordinary polyurethane acrylate (CR91647, produced by Guangdong Haohui New Material Co., Ltd.), 20 parts of commercially available tough trifunctional resin (Dongguan Huihe 7683), 20 parts of hexafunctional polyurethane resin (Lankel L-6600), 10 parts of isodecanyl acrylate, 20 parts of 1,6-hexanediol diacrylate, 2 parts of BYK-3500 leveling agent, and 0.5 parts of BYK-A530 defoamer. Disperse the mixture at 300 rpm for 40 min to obtain EB cured coating.
[0044] Comparative Example 2 This comparative example provides a UV-curable fluorocarbon sand-feel coating, which is prepared by the following method: Weigh out 20 parts of commercially available UV fluorocarbon resin (L-8322, Lankeluo), 20 parts of commercially available UV sand-sensitive resin (L-6367, Lankeluo), 20 parts of hexafunctional polyurethane resin (Lankeluo L-6600), 30 parts of 1,6-hexanediol diacrylate, 5 parts of silica powder (AEROSILR974, Evonik), 2 parts of BYK-3500 leveling agent, and 0.5 parts of BYK-A530 defoamer. Disperse the mixture at 300 rpm for 40 min to obtain a UV-cured fluorocarbon sand-sensitive coating.
[0045] Comparative Example 3 The difference between this comparative example and Example 8 is that commercially available ordinary polyurethane acrylate (CR91647, Guangdong Haohui New Materials Co., Ltd.) was used to replace the sand-feeling resin prepared in Example 4 in an equal amount, while the other raw materials and steps were the same.
[0046] Comparative Example 4 The difference between this comparative example and Example 8 is that commercially available ordinary polyurethane acrylate (CR91647, Guangdong Haohui New Materials Co., Ltd.) was used to replace the modified fluorocarbon resin prepared in Example 1 in an equal amount, while the other raw materials and steps were the same.
[0047] The EB curable coatings prepared in Examples 8-13 and Comparative Examples 1, 3, and 4 were coated onto the surface of a wooden board using a 30µm wire rod. Preliminary curing was first performed in an oxygen-rich environment using an electron beam at a curing dose of 30 kGy and a voltage of 200 V. Then, curing was performed in an oxygen-free, nitrogen-filled environment using a 172nm excimer lamp at an energy density of 50 mW / cm². 2 Finally, the coating was cured again using an electron beam in an oxygen-free nitrogen-filled environment with a curing dose of 40 KGy and a voltage of 200 V to obtain the corresponding coating. The coating prepared in Comparative Example 2 was cured using UV.
[0048] The coatings prepared in the above embodiments and comparative examples were tested for performance according to the following criteria: (1) Pencil hardness: The test was conducted according to GB / T 6739-2006 "Determination of paint film hardness by pencil method for paints and varnishes", with a load of 750g; (2) Yellowing resistance: The test was conducted according to GB / T 23983-2009 "Test Method for Yellowing Resistance of Wood Coatings", using a fluorescent ultraviolet lamp for continuous irradiation for 168 hours, and the color difference ΔE was measured. (3) Marker resistance: Draw a 5cm long straight line on the coating surface with a black oil-based marker. After the ink has dried naturally at room temperature for 5 minutes, wipe the ink area with a cotton cloth with the same force, observe and record whether the ink can be easily wiped off and whether there are any residual traces. (4) Scratch resistance: Tested according to GB / T 9279.1-2015 "Determination of scratch resistance of paints and varnishes - Part 1: Constant load method"; (5) Water contact angle: The test was conducted according to GB / T 30693-2014 "Measurement of the contact angle between plastic film and water". A contact angle measuring instrument was used. The coated sample was placed horizontally on the sample stage. A drop of deionized water with a volume of 2-5 μL was added to the surface of the coating using a microsyringe. After the droplet stabilized, the static contact angle was measured. Five different positions were tested for each sample, and the average value was taken. (6) Gloss: The test was conducted in accordance with GB / T 9754-2007 "Determination of 20°, 60° and 85° specular gloss of paint films without metallic pigments", using a 60° incident angle.
[0049] The test results are shown in Table 1: Table 1
[0050] As shown in Table 1, the coatings formed by the coatings of Examples 8-13 of this invention are significantly superior to the comparative examples in key performance indicators such as water contact angle, pencil hardness, yellowing resistance, scratch resistance, and marker pen resistance. Specifically, Comparative Example 1, lacking fluorocarbon components and a sand-like resin, has a water contact angle of only 45° and a hardness of only 2H, exhibiting poor scratch resistance and no sand-like effect. Comparative Example 2, while possessing some hydrophobic effect, requires the addition of photoinitiators and silica powder, resulting in lower yellowing resistance and hardness compared to this invention. Comparative Example 3, lacking a micro-nano rough structure, has a water contact angle of only 78° and a hardness of only 2H, exhibiting poor scratch resistance and no sand-like effect. Comparative Example 4, lacking low surface energy CF segments, has a water contact angle of only 54° and poor stain resistance. The above comparative data fully demonstrate that this invention, through the synergistic compounding of modified fluorocarbon resin and sand-like resin, enables the coating to possess high hydrophobicity, high hardness, high wear resistance, excellent weather resistance, and stain resistance. The synergistic effect of the two resins is significant, and the overall performance is significantly superior to existing comparative solutions.
[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used only 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 process, method, article, or apparatus.
[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An EB-cured fluorocarbon resin sand-feel coating, characterized in that, Including the following parts by weight of raw materials: 10-30 parts modified fluorocarbon resin, 20-30 parts sand-feeling resin, 20-30 parts polyurethane resin, 10-20 parts isodecyl acrylate, 10-20 parts 1,6-hexanediol diacrylate, 2 parts leveling agent, and 0.5 parts defoamer. The modified fluorocarbon resin is prepared by the following method: FEVE-type fluorocarbon resin was added to dry ethyl acetate and stirred at room temperature until the resin was completely dissolved. Then, 1,4-butanediol, catalyst and polymerization inhibitor were added in sequence and stirred to disperse evenly. The temperature was raised to 60°C and diisocyanate was slowly added dropwise. The reaction was maintained until the free -NCO content was 1.5-1.55%. Then, hydroxypropyl acrylate was slowly added dropwise and the reaction was maintained until the -NCO content approached 0. Finally, ethyl acetate was removed by rotary evaporation to obtain modified fluorocarbon resin. The sand-sensitive resin is prepared by the following method: Diisocyanate was added to dry adipic acid polyester diol, the temperature was raised to 80°C and kept at that temperature for 4 hours. After cooling, hydroxy acrylate and polymerization inhibitor were slowly added dropwise and stirred until homogeneous. Then, catalyst was added and stirred until homogeneous. The temperature was raised to 60°C and kept at that temperature for 3 hours. After cooling to room temperature, sand-like resin was obtained.
2. The EB-cured fluorocarbon resin sand-feel coating according to claim 1, characterized in that, The ratio of the FEVE-type fluorocarbon resin, ethyl acetate, 1,4-butanediol, catalyst, polymerization inhibitor, diisocyanate, and hydroxypropyl acrylate is 10g:15g:20g:20mg:30mg:1.26-1.97g:0.98g.
3. The EB-cured fluorocarbon resin sand-feel coating according to claim 1, characterized in that, The ratio of adipate polyester diol, diisocyanate, hydroxy acrylate, polymerization inhibitor and catalyst is 500g: 220-335g: 140-163g: 0.9-1g: 0.1g.
4. The EB-cured fluorocarbon resin sand-feel coating according to any one of claims 1-3, characterized in that, The diisocyanate is any one of isophorone diisocyanate, hexamethylene diisocyanate, and 4,4'-dicyclohexylmethane diisocyanate.
5. An EB-cured fluorocarbon resin sand-feel coating according to any one of claims 1-3, characterized in that, The catalyst is stannous octoate; the polymerization inhibitor is hydroquinone.
6. The EB-cured fluorocarbon resin sand-feel coating according to claim 1, characterized in that, The hydroxyacrylate is hydroxyethyl acrylate or hydroxyethyl methacrylate.
7. The EB-cured fluorocarbon resin sand-feel coating according to claim 1, characterized in that, The polyurethane resin is a hexafunctional polyurethane resin of Lankeluo L-6600; the leveling agent is BYK-3500; and the defoamer is BYK-A530.
8. The method for preparing an EB-cured fluorocarbon resin sand-feel coating according to claim 1, characterized in that, Includes the following steps: Weigh the modified fluorocarbon resin, sand-feel resin, polyurethane resin, isodecyl acrylate, 1,6-hexanediol diacrylate, leveling agent and defoamer according to the formula ratio, and disperse them at 300-600 rpm for 20-40 min to obtain EB-cured fluorocarbon resin sand-feel coating.