Vacuum electroplating uv light-cured primer and method for preparing the same

Abstract

This invention discloses a vacuum electroplating UV-curable primer and its preparation method, relating to vacuum electroplating UV-curable coatings. The vacuum electroplating UV-curable primer of this invention has suitable curing efficiency and excellent coating adhesion. The coating exhibits low UV-curing volume shrinkage and excellent flexibility and leveling properties, resulting in a smooth, flat, high-gloss, and metallic finish. Furthermore, it demonstrates superior high-temperature resistance and water-boiling resistance, exhibiting excellent overall performance.

Description

Technical Field

[0001] This invention relates to the field of vacuum electroplating UV-curable coating technology, and in particular to a vacuum electroplating UV-curable primer and its preparation method. Background Technology

[0002] Vacuum electroplating UV-curable coatings are decorative coatings used for metallizing substrate surfaces. They achieve a high-gloss metallic finish by combining vacuum electroplating technology with UV curing processes. Common substrates include glass and plastics. Vacuum electroplating UV-curable coatings mainly consist of a primer and a topcoat. The topcoat protects the metallic coating and improves wear resistance; the primer seals the substrate and enhances coating adhesion. Since most substrate surfaces are not perfectly smooth, direct electroplating results in an uneven surface, low gloss, poor metallic appearance, and defects such as bubbles and blisters. The primer forms a coating on the substrate surface, thus avoiding these inherent surface defects, improving the electroplating effect, and resulting in a smooth, glossy, and metallic finish.

[0003] The main components of UV-curable coatings include oligomers, reactive diluents, and photoinitiators. Both oligomers and reactive diluents possess numerous photoactive groups. During rapid curing, the intermolecular forces transform from van der Waals forces to chemical bonds, shortening the intermolecular distance and resulting in volume shrinkage. This rapid shrinkage leads to stress accumulation; the faster the curing, the greater the stress, which in turn affects the coating's performance, causing deformation, warping, and adhesion failure. Furthermore, poor flexibility and leveling properties in the coating can lead to unstable adhesion and poor smoothness, affecting its appearance and adhesion. In addition, insufficient temperature and humidity resistance prevents the coating from meeting the requirements of high-temperature and high-humidity environments, limiting its application range. Therefore, to meet the needs of vacuum electroplating primers, it is necessary to provide a vacuum electroplating UV-curable primer that reduces shrinkage and stress while ensuring curing efficiency, improves coating adhesion, and also possesses excellent flexibility, leveling properties, and temperature and humidity resistance. Summary of the Invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a vacuum electroplating UV curing primer and its preparation method.

[0005] The present invention proposes a vacuum electroplating UV curable primer, comprising the following raw materials in parts by weight: 30-85 parts of polyester polyol containing aliphatic ring structure, 10-60 parts of reactive diluent, 0.1-5 parts of photoinitiator, 0.01-1 parts of stabilizer, 0.1-5 parts of other additives, and 20-150 parts of solvent;

[0006] The polyester polyol containing aliphatic ring structure is prepared by polycondensation reaction of diacid component and polyol component, wherein the molar ratio of diacid component and polyol component is 1:0.8~2.

[0007] The diacid component is composed of aliphatic cyclic diacids and aliphatic chain diacids, wherein the molar amount of aliphatic cyclic diacids is 20% to 95% of the total molar amount of the diacid component;

[0008] The polyol component is composed of diols and castor oil, wherein the molar amount of castor oil is 2% to 10% of the total molar amount of the polyol component, and the diol is composed of aliphatic cyclic diols and aliphatic chain diols, wherein the molar amount of aliphatic cyclic diols is 20% to 95% of the total molar amount of the diols.

[0009] Preferably, the preparation method of the polyester polyol containing the aliphatic ring structure includes: adding the diacid component, the polyol component, the dehydrating agent, the catalyst, and the antioxidant into a reaction vessel, and carrying out a polycondensation reaction at 150~240℃ for 3~12h under a protective atmosphere and stirring. After the reaction is completed, the dehydrating agent is removed under vacuum to obtain the product.

[0010] Preferably, the mass of the dehydrating agent is 5% to 20% of the sum of the masses of the dicarboxylic acid component and the polyol component.

[0011] Preferably, the dehydrating agent is selected from at least one of cyclohexane, n-heptane, toluene, and xylene.

[0012] Preferably, the mass of the catalyst is 0.1% to 3% of the sum of the masses of the dicarboxylic acid component and the polyol component.

[0013] Preferably, the catalyst is selected from at least one of zinc acetate, cobalt acetate, antimony trioxide, monobutyltin oxide, dibutyltin oxide, methanesulfonic acid, p-methylbenzenesulfonic acid, tetrabutyl titanate, and tetraisobutyl titanate.

[0014] Preferably, the mass of the antioxidant is 0.05% to 0.5% of the sum of the masses of the diacid component and the polyol component.

[0015] Preferably, the antioxidant is selected from at least one of hypophosphite and phosphite antioxidants.

[0016] Preferably, the alicyclic dicarboxylic acid is selected from at least one of 1,4-cyclohexanedicarboxylic acid, tetrahydrophthalic anhydride, and hexahydrophthalic anhydride.

[0017] Preferably, the fatty acid chain dicarboxylic acid is selected from at least one of succinic acid, glutaric acid, adipic acid, azelaic acid, sebacic acid, and isononanoic acid.

[0018] Preferably, the alicyclic diol is selected from at least one of 1,4-cyclohexanediethanol and hydrogenated bisphenol A.

[0019] Preferably, the aliphatic chain diol is selected from at least one of ethylene glycol, ethylene glycol monohydrate, 1,2-propanediol, 2-methyl-1,3-propanediol, dipropylene glycol monohydrate, 1,3-propanediol, 1,3-butanediol, 2,3-butanediol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, diethylene glycol, triethylene glycol, 1,9-nonanediol, 1,10-decanediol, 1,11-undecanediol, 1,12-dodecanediol, 1,14-tetradecanediol, 2-butyl-2-ethyl-1,3-propanediol, and 2-ethyl-3-propyl-1,3-propanediol.

[0020] Preferably, the reactive diluent is selected from at least one of methyl acrylate, butyl acrylate, isodecanyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, glycidyl methacrylate, isobornyl acrylate, tetrahydrofuran acrylate, N-vinylpyrrolidone, dipropylene glycol diacrylate, tripropylene glycol diacrylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated glycerol triacrylate, pentaerythritol triacrylate, dimethylolpropane tetraacrylate, and dipentaerythritol hexaacrylate.

[0021] Preferably, the photoinitiator is selected from at least one of 1-hydroxy-cyclohexyl-phenyl ketone, 2-hydroxy-methylphenylpropane-1-one, 2-methyl-2-(4-morpholino)-1-(4-methylthiophenyl)-1-propanone, 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylphenylpropanone, methyl benzoylformate, benzoin dimethyl ketal, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, benzophenone, isopropylthioxanthraphenone, and 4-methylbenzophenone.

[0022] Preferably, the stabilizer is selected from at least one of 4-methoxyphenol, p-hydroxyanisole, hydroquinone, 2,6-di-tert-butyl-p-cresol, pyrogallol, and resorcinol.

[0023] Preferably, the other additives are selected from at least one of leveling agents, defoamers, and adhesion promoters.

[0024] Preferably, the solvent is selected from at least one of ethanol, isopropanol, ethyl acetate, butyl acetate, acetone, butanone, toluene, xylene, ethylene glycol ethyl ether, propylene glycol methyl ether, and propylene glycol butyl ether.

[0025] The present invention also provides a method for preparing the aforementioned vacuum electroplating UV curable primer, comprising the following steps: mixing a polyester polyol containing an aliphatic ring structure with an active diluent, a photoinitiator, a stabilizer, other additives and a solvent, dispersing at high speed, and then performing a defoaming treatment to obtain the primer.

[0026] In this invention, the specific method of defoaming treatment is a conventional operation, and any conventional method in the field can be used, such as ultrasonic defoaming. This invention does not impose any special limitations on this method.

[0027] The beneficial effects of this invention are as follows:

[0028] This invention uses a suitable proportion of aliphatic chain diacids and polyols, alicyclic diacids and polyols, and castor oil as polymer monomers. A polyester polyol synthesized through a condensation reaction is then mixed with photoactive diluents, photoinitiators, and other raw materials to obtain a vacuum electroplating UV-curable primer. The polyester polyol does not contain photoactive groups and, as an inert resin, can dilute the density of photoactive groups in the UV primer system, reducing the curing shrinkage rate and shrinkage stress. The alicyclic structure in the polyester polyol can also improve rigidity, giving the coating excellent adhesion, mechanical strength, and hardness. Furthermore, its high glass transition temperature gives the coating good resistance to high-temperature deformation. However, it also increases the viscosity of the system, which is detrimental to leveling and coating smoothness, and causes the coating to become brittle and less flexible. Castor oil, with its branched structure and flexible long chains, can reduce viscosity and improve leveling performance and flexibility. Combined with the alicyclic structure, this results in a coating with excellent resistance to boiling and baking, as well as smoothness. In summary, the vacuum electroplating UV curing primer of the present invention has suitable curing efficiency and excellent coating adhesion. The coating has low UV curing volume shrinkage and excellent flexibility and leveling properties, resulting in a smooth and flat metal coating with high gloss and good metallic feel. It also has excellent moisture resistance and high temperature resistance, and good overall performance. Detailed Implementation

[0029] The technical solution of the present invention will now be described in detail through specific embodiments.

[0030] In the following examples and comparative examples, castor oil is a commercially available product with CAS number 8001-79-4 and molecular weight of 933.4.

[0031] Example 1

[0032] A vacuum electroplating UV-curable primer is composed of the following raw materials: 60g of polyester polyol containing an aliphatic ring structure, 10g of methyl acrylate, 10g of butyl acrylate, 20g of trimethylolpropane triacrylate, 1g of 1-hydroxy-cyclohexyl-phenyl ketone, 0.1g of 4-methoxyphenol, 0.5g of leveling agent BYK373, 0.3g of defoamer BYK088, 2g of adhesion promoter 1,2-bis(trimethoxysilyl)ethane, 50g of butyl acetate, and 50g of butanone.

[0033] The polyester polyol containing aliphatic ring structure is obtained by polycondensation reaction of the following raw materials: 68.9g of 1,4-cyclohexanedicarboxylic acid, 60.9g of tetrahydrophthalic anhydride, 29.2g of 1,6-adipic acid, 82.4g of 1,4-cyclohexanediethanol, 60.8g of 1,6-hexanediol, and 53.5g of castor oil.

[0034] The preparation method of the above-mentioned polyester polyol containing aliphatic ring structure is as follows: 68.9g of 1,4-cyclohexanedicarboxylic acid, 60.9g of tetrahydrophthalic anhydride, 29.2g of 1,6-adipic acid, 82.4g of 1,4-cyclohexanediethanol, 60.8g of 1,6-hexanediol, 53.5g of castor oil, 17.8g of toluene, 1.8g of monobutyltin oxide, and 0.4g of hypophosphite are added to a reaction vessel. Under a nitrogen atmosphere, the polycondensation reaction is carried out at 200℃ and 300rpm for 8h. After the reaction is completed, the toluene is evaporated and removed under a vacuum of -0.09MPa to obtain the product.

[0035] The preparation method of vacuum electroplating UV-curable primer is as follows: Polyester polyol containing aliphatic ring structure is mixed with methyl acrylate, butyl acrylate, trimethylolpropane triacrylate, 1-hydroxy-cyclohexyl-phenyl ketone, 4-methoxyphenol, leveling agent BYK373, defoamer BYK088, adhesion promoter 1,2-bistrimethoxysilyl ethane, butyl acetate, and butanone. The mixture is then dispersed at high speed at 1500 rpm / min for 20 min using a high-speed dispersant, followed by ultrasonic defoaming treatment for 20 min to obtain the final product.

[0036] Using the aforementioned vacuum electroplating UV-curable primer as a base coat, a vacuum electroplating coating is prepared on the surface of a glass substrate. The specific steps are as follows: The aforementioned vacuum electroplating UV-curable primer is sprayed onto the glass substrate to form a wet film, baked in a 60°C oven (or drying tunnel) for 3 minutes, and then cured by a conveyor belt-type ultraviolet mercury lamp (irradiation dose 1000 mJ / cm). 2A primer coating with a thickness of 20 μm is obtained. Then, the primer coating is placed in a true electroplating machine to electroplat an aluminum layer (1-2 μm thick). A topcoat (Jinqiao Deke HT-0895H) is then sprayed onto the aluminum layer to form a wet film. The film is baked in a 60℃ oven (or drying tunnel) for 3 minutes and then cured using a conveyor belt-type ultraviolet mercury lamp (irradiation dose 1000 mJ / cm²). 2 This process yields a topcoat coating with a thickness of 10 μm.

[0037] Example 2

[0038] A vacuum electroplating UV-curable primer is composed of the following raw materials: 30g of polyester polyol containing an aliphatic ring structure, 20g of isodecanyl acrylate, 20g of hydroxyethyl acrylate, 20g of ethoxylated trimethylolpropane triacrylate, 0.5g of 2-hydroxy-methylphenylpropane-1-one, 0.5g of 2-methyl-2-(4-morpholino)-1-(4-methylthiophenyl)-1-propanone, 0.01g of p-hydroxyanisole, 1.0g of leveling agent BYK373, 0.1g of defoamer BYK088, 0.5g of adhesion promoter 1,2-bis(trimethoxysilyl ethane), 20g of butyl acetate, and 20g of isopropanol;

[0039] The polyester polyol containing aliphatic ring structure is obtained by polycondensation reaction of the following raw materials: 51.6g of 1,4-cyclohexanedicarboxylic acid, 46.3g of hexahydrophthalic anhydride, 47.2g of 1,4-succinic acid, 120.2g of hydrogenated bisphenol A, 43.4g of ethylene glycol, and 46.7g of castor oil.

[0040] The preparation method of the above-mentioned polyester polyol containing aliphatic ring structure is as follows: 51.6g of 1,4-cyclohexanedicarboxylic acid, 46.3g of hexahydrophthalic anhydride, 47.2g of 1,4-succinic acid, 120.2g of hydrogenated bisphenol A, 43.4g of ethylene glycol, and 46.7g of castor oil were added to a reaction vessel along with 52.3g of xylene, 0.75g of antimony trioxide, and 0.37g of hypophosphite. The mixture was subjected to a polycondensation reaction at 190℃ and 300rpm for 7.5h under a nitrogen atmosphere. After the reaction was completed, the xylene was evaporated under a vacuum of -0.09MPa to obtain the final product.

[0041] The preparation method of vacuum electroplating UV curing primer is as follows: Polyester polyol containing aliphatic ring structure is mixed with isodecanyl acrylate, hydroxyethyl acrylate, ethoxylated trimethylolpropane triacrylate, 2-hydroxy-methylphenylpropane-1-one, 2-methyl-2-(4-morpholino)-1-(4-methylthiophenyl)-1-propanone, p-hydroxyanisole, leveling agent BYK373g, defoamer BYK088g, adhesion promoter 1,2-bis(trimethoxysilyl ethane), ethyl acetate, and isopropanol. The mixture is then dispersed at high speed at 1500 rpm / min for 20 min using a high-speed dispersant, followed by ultrasonic defoaming treatment for 20 min to obtain the final product.

[0042] Using the above-mentioned vacuum electroplating UV-curable primer as a primer, a vacuum electroplating coating is prepared on the surface of a glass substrate, with the specific steps being the same as in Example 1.

[0043] Example 3

[0044] A vacuum electroplating UV-curable primer is composed of the following raw materials: 85g of polyester polyol containing an aliphatic ring structure, 10g of hydroxypropyl acrylate, 15g of glycidyl methacrylate, 35g of glyceryl propoxylate triacrylate, 0.5g of 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylphenylacetone, 0.3g of hydroquinone, 1.0g of leveling agent BYK373, 1.0g of defoamer BYK088, 1.0g of adhesion promoter 1,2-bis(trimethoxysilyl ethane), 100g of butyl acetate, and 20g of toluene;

[0045] The polyester polyol containing aliphatic ring structure is obtained by polycondensation reaction of the following raw materials: 30.4g tetrahydrophthalic anhydride, 61.7g hexahydrophthalic anhydride, 75.3g azelaic acid, 76.9g 1,4-cyclohexanediol, 69.7g 1,4-butanediol, and 24.9g castor oil.

[0046] The preparation method of the above-mentioned polyester polyol containing aliphatic ring structure is as follows: 30.4g of tetrahydrophthalic anhydride, 61.7g of hexahydrophthalic anhydride, 75.3g of azelaic acid, 76.9g of 1,4-cyclohexanediol, 69.7g of 1,4-butanediol, 24.9g of castor oil, 48.7g of xylene, 4.33g of monobutyltin oxide, and 1.08g of hypophosphite are added to a reaction vessel. Under a nitrogen atmosphere, the polycondensation reaction is carried out at 220℃ and 300rpm for 10h. After the reaction is completed, the xylene is evaporated and removed under a vacuum of -0.09MPa to obtain the product.

[0047] The preparation method of vacuum electroplating UV curing primer is as follows: Polyester polyol containing aliphatic ring structure is mixed with hydroxypropyl acrylate, glycidyl methacrylate, glyceryl propoxylated triacrylate, 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylphenylacetone, hydroquinone, leveling agent BYK373, defoamer BYK088, adhesion promoter 1,2-bis(trimethoxysilyl ethane), butyl acetate, and toluene. The mixture is then dispersed at high speed at 1500 rpm / min for 20 min using a high-speed dispersant, followed by ultrasonic defoaming treatment for 20 min to obtain the final product.

[0048] Using the above-mentioned vacuum electroplating UV-curable primer as a primer, a vacuum electroplating coating is prepared on the surface of a glass substrate, with the specific steps being the same as in Example 1.

[0049] Example 4

[0050] A vacuum electroplating UV-curable primer is composed of the following raw materials: 50g of polyester polyol containing an aliphatic ring structure, 20g of isoborneol acrylate, 20g of tetrahydrofuran acrylate, 10g of pentaerythritol triacrylate, 1g of benzoin dimethyl ketal, 1g of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, 0.5g of pyrogallol, 0.5g of resorcinol, 3.0g of leveling agent BYK373, 0.5g of defoamer BYK088, 3.0g of adhesion promoter 1,2-bis(trimethoxysilyl)ethane, 40g of isopropanol, and 20g of toluene.

[0051] The polyester polyol containing aliphatic ring structure is obtained by polycondensation reaction of the following raw materials: 91.3g tetrahydrophthalic anhydride, 40.4g sebacic acid, 29.2g adipic acid, 86.5g hydrogenated bisphenol A, 86.8g diethylene glycol, and 16.8g castor oil.

[0052] The preparation method of the above-mentioned polyester polyol containing aliphatic ring structure is as follows: 91.3g of tetrahydrophthalic anhydride, 40.4g of sebacic acid, 29.2g of adipic acid, 86.5g of hydrogenated bisphenol A, 86.8g of diethylene glycol, 16.8g of castor oil, 48.5g of toluene, 1.45g of methanesulfonic acid, and 0.73g of hypophosphoric acid are added to a reaction vessel. Under a nitrogen atmosphere, a polycondensation reaction is carried out at 170℃ and a stirring speed of 300rpm for 6 hours. After the reaction is completed, toluene is evaporated and removed under a vacuum of -0.09MPa to obtain the product.

[0053] The preparation method of vacuum electroplating UV-curable primer is as follows: Polyester polyol containing aliphatic ring structure is mixed with isoborneol acrylate, tetrahydrofuran acrylate, pentaerythritol triacrylate, benzoin dimethyl ketal, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, pyrogallol, resorcinol, leveling agent BYK373, defoamer BYK088, adhesion promoter 1,2-bis(trimethoxysilyl ethane), isopropanol, and toluene. The mixture is then dispersed at high speed at 1500 rpm / min for 20 min using a high-speed dispersant, followed by ultrasonic defoaming treatment for 20 min to obtain the final product.

[0054] Using the above-mentioned vacuum electroplating UV-curable primer as a primer, a vacuum electroplating coating is prepared on the surface of a glass substrate, with the specific steps being the same as in Example 1.

[0055] Example 5

[0056] A vacuum electroplating UV-curable primer is composed of the following raw materials: 80g of polyester polyol containing an aliphatic ring structure, 20g of N-vinylpyrrolidone, 15g of dipropylene glycol diacrylate, 15g of ditrimethylolpropane tetraacrylate, 3.0g of phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide, 2.0g of benzophenone, 0.05g of 2,6-di-tert-butyl-p-cresol, 2.0g of leveling agent BYK373, 0.6g of defoamer BYK088, 1.5g of adhesion promoter 1,2-bis(trimethoxysilyl ethane), 50g of ethanol, 40g of isopropanol, and 60g of toluene;

[0057] The polyester polyol containing aliphatic ring structure is obtained by polycondensation reaction of the following raw materials: 123.3g hexahydrophthalic anhydride, 29.2g adipic acid, 100.9g 1,4-cyclohexanediethanol, 68.3g triethylene glycol, and 10.9g castor oil.

[0058] The preparation method of the above-mentioned polyester polyol containing aliphatic ring structure is as follows: 123.3g of hexahydrophthalic anhydride, 29.2g of adipic acid, 100.9g of 1,4-cyclohexanediethanol, 68.3g of triethylene glycol, 10.9g of castor oil, 49.8g of toluene, 4.1g of p-toluenesulfonic acid, and 1.0g of hypophosphite are added to a reaction vessel. Under a nitrogen atmosphere, the polycondensation reaction is carried out at 180℃ and 300rpm for 8h. After the reaction is completed, the toluene is evaporated and removed under a vacuum of -0.09MPa to obtain the product.

[0059] The preparation method of vacuum electroplating UV-curable primer is as follows: Polyester polyol containing aliphatic ring structure is mixed with N-vinylpyrrolidone, dipropylene glycol diacrylate, ditrimethylolpropane tetraacrylate, phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide, benzophenone, 2,6-di-tert-butyl-p-cresol, leveling agent BYK373, defoamer BYK088, adhesion promoter 1,2-bis(trimethoxysilyl ethane), ethanol, isopropanol, and toluene. The mixture is then dispersed at high speed at 1500 rpm / min for 20 min using a high-speed dispersant, followed by ultrasonic defoaming treatment for 20 min to obtain the final product.

[0060] Using the above-mentioned vacuum electroplating UV-curable primer as a primer, a vacuum electroplating coating is prepared on the surface of a glass substrate, with the specific steps being the same as in Example 1.

[0061] Example 6

[0062] A vacuum electroplating UV-curable primer is composed of the following raw materials: 40g of polyester polyol containing an aliphatic ring structure, 3g of methyl acrylate, 3g of butyl acrylate, 4g of trimethylolpropane triacrylate, 0.1g of 1-hydroxy-cyclohexyl-phenyl ketone, 0.5g of 4-methoxyphenol, 1.5g of leveling agent BYK373, 0.2g of defoamer BYK088, 2.5g of adhesion promoter 1,2-bis(trimethoxysilyl)ethane, and 20g of isopropanol;

[0063] The polyester polyol containing aliphatic ring structure is obtained by polycondensation reaction of the following raw materials: 17.2g of 1,4-cyclohexanedicarboxylic acid, 92.5g of hexahydrophthalic anhydride, 35.4g of succinic acid, 82.7g of 1,4-cyclohexanediethanol, 70.3g of nonanediol, and 105g of castor oil.

[0064] The preparation method of the above-mentioned polyester polyol containing aliphatic ring structure is as follows: 17.2g of 1,4-cyclohexanedicarboxylic acid, 92.5g of hexahydrophthalic anhydride, 35.4g of succinic acid, 82.7g of 1,4-cyclohexanediethanol, 70.3g of nonanediol, 105g of castor oil, 43.0g of xylene, 2.0g of monobutyltin oxide, 1.68g of antimony trioxide, and 0.9g of hypophosphite are added to a reaction vessel. Under a nitrogen atmosphere, the polycondensation reaction is carried out at 200℃ and 300rpm for 9.5h. After the reaction is completed, the xylene is evaporated and removed under a vacuum of -0.09MPa to obtain the product.

[0065] The preparation method of vacuum electroplating UV-curable primer is as follows: Polyester polyol containing aliphatic ring structure is mixed with methyl acrylate, butyl acrylate, trimethylolpropane triacrylate, 1-hydroxy-cyclohexyl-phenyl ketone, 4-methoxyphenol, leveling agent BYK373, defoamer BYK088, adhesion promoter 1,2-bis(trimethoxysilyl ethane) and isopropanol. The mixture is then dispersed at high speed at 1500 rpm / min for 20 min using a high-speed dispersant, followed by ultrasonic defoaming treatment for 20 min to obtain the final product.

[0066] Using the above-mentioned vacuum electroplating UV-curable primer as a primer, a vacuum electroplating coating is prepared on the surface of a glass substrate, with the specific steps being the same as in Example 1.

[0067] Example 7

[0068] A vacuum electroplating UV-curable primer is composed of the following raw materials: 70g of polyester polyol containing an aliphatic ring structure, 30g of dipentaerythritol hexaacrylate, 0.6g of 1-hydroxy-cyclohexyl-phenyl ketone, 2.0g of benzoin dimethyl ketal, 1.0g of benzophenone, 0.8g of hydroquinone, 2.5g of leveling agent BYK373, 0.8g of defoamer BYK088, 0.8g of adhesion promoter 1,2-bis(trimethoxysilyl)ethane, 30g of ethyl acetate, 30g of isopropanol, and 20g of toluene;

[0069] The polyester polyol containing an aliphatic ring structure is obtained by polycondensation reaction of the following raw materials: 86.1g of 1,4-cyclohexanedicarboxylic acid, 73.1g of 1,6-adipic acid, 32.0g of 1,4-cyclohexanediethanol, 37.0g of pentanediol, 40.0g of 2-methyl-1,3-propanediol, and 82.9g of castor oil.

[0070] The preparation method of the above-mentioned polyester polyol containing aliphatic ring structure is as follows: 86.1g of 1,4-cyclohexanedicarboxylic acid, 73.1g of 1,6-adipic acid, 32.0g of 1,4-cyclohexanediethanol, 37.0g of pentanediol, 40.0g of 2-methyl-1,3-propanediol, 82.9g of castor oil, 56.7g of toluene, 5.3g of tetrabutyl titanate, and 1.2g of hypophosphite are added to a reaction vessel. Under a nitrogen atmosphere, a polycondensation reaction is carried out at 175℃ and a stirring speed of 300rpm for 7h. After the reaction is completed, toluene is evaporated and removed under a vacuum of -0.09MPa to obtain the product.

[0071] The preparation method of vacuum electroplating UV-curable primer is as follows: Polyester polyol containing aliphatic ring structure is mixed with dipentaerythritol hexaacrylate, 1-hydroxy-cyclohexyl-phenyl ketone, benzoin dimethyl ketal, benzophenone, hydroquinone, leveling agent BYK373, defoamer BYK088, adhesion promoter 1,2-bis(trimethoxysilyl ethane), ethyl acetate, isopropanol, and toluene. The mixture is then dispersed at high speed at 1500 rpm / min for 20 min using a high-speed dispersant, followed by ultrasonic defoaming treatment for 20 min to obtain the final product.

[0072] Using the above-mentioned vacuum electroplating UV-curable primer as a primer, a vacuum electroplating coating is prepared on the surface of a glass substrate, with the specific steps being the same as in Example 1.

[0073] Example 8

[0074] A vacuum electroplating UV-curable primer is composed of the following raw materials: 65g of polyester polyol containing an aliphatic ring structure, 12g of dipropylene glycol diacrylate, 13g of ditrimethylolpropane tetraacrylate, 2.5g of 2-hydroxy-methylphenylpropane-1-one, 0.2g of 4-methoxyphenol, 0.8g of leveling agent BYK373, 0.4g of defoamer BYK088, 1.8g of adhesion promoter 1,2-bis(trimethoxysilyl)ethane, 40g of ethyl acetate, and 35g of toluene;

[0075] The polyester polyol containing aliphatic ring structure is obtained by polycondensation reaction of the following raw materials: 30.4g tetrahydrophthalic anhydride, 59.0g succinic acid, 43.8g adipic acid, 211.5g hydrogenated bisphenol A, 11.5g neopentyl glycol, and 102.7g castor oil.

[0076] The preparation method of the above-mentioned polyester polyol containing aliphatic ring structure is as follows: 30.4g of tetrahydrophthalic anhydride, 59.0g of succinic acid, 43.8g of adipic acid, 211.5g of hydrogenated bisphenol A, 11.5g of neopentyl glycol, 102.7g of castor oil, 82.6g of toluene, 9.1g of zinc acetate, and 2.3g of hypophosphite are added to a reaction vessel. Under a nitrogen atmosphere, a polycondensation reaction is carried out at 195℃ and a stirring speed of 300rpm for 9h. After the reaction is completed, toluene is evaporated and removed under a vacuum of -0.09MPa to obtain the product.

[0077] The preparation method of vacuum electroplating UV curable primer is as follows: Polyester polyol containing aliphatic ring structure is mixed with dipropylene glycol diacrylate, ditrimethylolpropane tetraacrylate, 2-hydroxy-methylphenylpropane-1-one, 4-methoxyphenol, leveling agent BYK373, defoamer BYK088, adhesion promoter 1,2-bis(trimethoxysilyl ethane), ethyl acetate, and toluene. The mixture is then dispersed at high speed at 1500 rpm / min for 20 min using a high-speed dispersant, followed by ultrasonic defoaming treatment for 20 min to obtain the final product.

[0078] Using the above-mentioned vacuum electroplating UV-curable primer as a primer, a vacuum electroplating coating is prepared on the surface of a glass substrate, with the specific steps being the same as in Example 1.

[0079] Example 9

[0080] A vacuum electroplating UV-curable primer is composed of the following raw materials: 55g of polyester polyol containing an aliphatic ring structure, 20g of isoborneol acrylate, 15g of ethoxylated trimethylolpropane triacrylate, 10g of propoxylated glycerol triacrylate, 1.5g of phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide, 0.1g of p-hydroxyanisole, 0.1g of hydroquinone, 0.3g of phloroglucinol, 0.6g of leveling agent BYK373, 0.7g of defoamer BYK088, 2.8g of adhesion promoter 1,2-bis(trimethoxysilyl ethane), 45g of ethyl acetate, and 45g of toluene;

[0081] The polyester polyol containing aliphatic ring structure is obtained by polycondensation reaction of the following raw materials: 34.4g of 1,4-cyclohexanedicarboxylic acid, 60.8g of tetrahydrophthalic anhydride, 47.2g of succinic acid, 62.9g of 1,4-cyclohexanediethanol, 73.5g of 1,6-hexanediol, and 30.6g of castor oil.

[0082] The preparation method of the above-mentioned polyester polyol containing aliphatic ring structure is as follows: 34.4g of 1,4-cyclohexanedicarboxylic acid, 60.8g of tetrahydrophthalic anhydride, 47.2g of succinic acid, 62.9g of 1,4-cyclohexanediethanol, 73.5g of 1,6-hexanediol, 30.6g of castor oil, 110g of xylene, 8.5g of methanesulfonic acid, 8g of p-toluenesulfonic acid, and 2.2g of hypophosphite are added to a reaction vessel. Under a nitrogen atmosphere, the polycondensation reaction is carried out at 215℃ and 300rpm for 10h. After the reaction is completed, the xylene is evaporated and removed under a vacuum of -0.09MPa to obtain the product.

[0083] The preparation method of vacuum electroplating UV-curable primer is as follows: Polyester polyol containing aliphatic ring structure is mixed with isoborneol acrylate, ethoxylated trimethylolpropane triacrylate, propoxylated glycerol triacrylate, phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide, p-hydroxyanisole, hydroquinone, phloroglucinol, leveling agent BYK373, defoamer BYK088, adhesion promoter 1,2-bistrimethoxysilyl ethane, ethyl acetate, and toluene. The mixture is then dispersed at high speed at 1500 rpm / min for 20 min using a high-speed dispersant, followed by ultrasonic defoaming treatment for 20 min to obtain the final product.

[0084] Using the above-mentioned vacuum electroplating UV-curable primer as a primer, a vacuum electroplating coating is prepared on the surface of a glass substrate, with the specific steps being the same as in Example 1.

[0085] Comparative Example 1

[0086] A vacuum electroplating UV-curable primer is composed of the following raw materials: 60g polyester polyol, 10g methyl acrylate, 10g butyl acrylate, 20g trimethylolpropane triacrylate, 1g 1-hydroxy-cyclohexyl-phenyl ketone, 0.1g 4-methoxyphenol, 0.5g leveling agent BYK373, 0.3g defoamer BYK088, 2g adhesion promoter 1,2-bis(trimethoxysilyl)ethane, 50g butyl acetate, and 50g butanone.

[0087] The polyester polyol is prepared by polycondensation reaction of the following raw materials: 150.6g azelaic acid, 29.2g 1,6-adipic acid, 91.6g nonanediol, 60.8g 1,6-hexanediol, and 53.5g castor oil.

[0088] The preparation method of the above-mentioned polyester polyol is as follows: 150.6g of azelaic acid, 29.2g of 1,6-adipic acid, 91.6g of nonanediol, 60.8g of 1,6-hexanediol, 53.5g of castor oil, 17.8g of toluene, 1.8g of monobutyltin oxide, and 0.4g of hypophosphite are added to a reaction vessel. Under a nitrogen atmosphere, the polycondensation reaction is carried out at 200℃ and 300rpm for 8h. After the reaction is completed, the toluene is evaporated and removed under a vacuum of -0.09MPa to obtain the product.

[0089] The preparation method of vacuum electroplating UV curing primer is as follows: Polyester polyol is mixed with methyl acrylate, butyl acrylate, trimethylolpropane triacrylate, 1-hydroxy-cyclohexyl-phenyl ketone, 4-methoxyphenol, leveling agent BYK373, defoamer BYK088, adhesion promoter 1,2-bistrimethoxysilyl ethane, butyl acetate, and butanone. The mixture is then dispersed at high speed at 1500 rpm / min for 20 min using a high-speed dispersant, followed by ultrasonic defoaming treatment for 20 min to obtain the final product.

[0090] Using the above-mentioned vacuum electroplating UV-curable primer as a primer, a vacuum electroplating coating is prepared on the surface of a glass substrate, with the specific steps being the same as in Example 1.

[0091] Comparative Example 2

[0092] A vacuum electroplating UV-curable primer is composed of the following raw materials: 60g of polyester polyol containing an aliphatic ring structure, 10g of methyl acrylate, 10g of butyl acrylate, 20g of trimethylolpropane triacrylate, 1g of 1-hydroxy-cyclohexyl-phenyl ketone, 0.1g of 4-methoxyphenol, 0.5g of leveling agent BYK373, 0.3g of defoamer BYK088, 2g of adhesion promoter 1,2-bis(trimethoxysilyl)ethane, 50g of butyl acetate, and 50g of butanone.

[0093] The polyester polyol containing aliphatic ring structure is obtained by polycondensation reaction of the following raw materials: 8.6g of 1,4-cyclohexanedicarboxylic acid, 7.4g of tetrahydrophthalic anhydride, 131.5g of 1,6-adipic acid, 8.24g of 1,4-cyclohexanediethanol, 121.5g of 1,6-hexanediol, and 53.5g of castor oil.

[0094] The preparation method of the above-mentioned polyester polyol containing aliphatic ring structure is as follows: 8.6g of 1,4-cyclohexanedicarboxylic acid, 7.4g of tetrahydrophthalic anhydride, 131.5g of 1,6-adipic acid, 8.24g of 1,4-cyclohexanediethanol, 121.5g of 1,6-hexanediol, 53.5g of castor oil, 17.8g of toluene, 1.8g of monobutyltin oxide, and 0.4g of hypophosphite are added to a reaction vessel. Under a nitrogen atmosphere, a polycondensation reaction is carried out at 200℃ and a stirring speed of 300rpm for 8 hours. After the reaction is completed, toluene is evaporated and removed under a vacuum of -0.09MPa to obtain the product.

[0095] The preparation method of vacuum electroplating UV-curable primer is as follows: Polyester polyol containing aliphatic ring structure is mixed with methyl acrylate, butyl acrylate, trimethylolpropane triacrylate, 1-hydroxy-cyclohexyl-phenyl ketone, 4-methoxyphenol, leveling agent BYK373, defoamer BYK088, adhesion promoter 1,2-bistrimethoxysilyl ethane, butyl acetate, and butanone. The mixture is then dispersed at high speed at 1500 rpm / min for 20 min using a high-speed dispersant, followed by ultrasonic defoaming treatment for 20 min to obtain the final product.

[0096] Using the above-mentioned vacuum electroplating UV-curable primer as a primer, a vacuum electroplating coating is prepared on the surface of a glass substrate, with the specific steps being the same as in Example 1.

[0097] Comparative Example 3

[0098] A vacuum electroplating UV-curable primer is composed of the following raw materials: 60g of polyester polyol containing an aromatic ring structure, 10g of methyl acrylate, 10g of butyl acrylate, 20g of trimethylolpropane triacrylate, 1g of 1-hydroxy-cyclohexyl-phenyl ketone, 0.1g of 4-methoxyphenol, 0.5g of leveling agent BYK373, 0.3g of defoamer BYK088, 2g of adhesion promoter 1,2-bis(trimethoxysilyl)ethane, 50g of butyl acetate, and 50g of butanone.

[0099] The polyester polyol containing the aromatic ring structure is obtained by polycondensation reaction of the following raw materials: 66.45g isophthalic acid, 59.3g phthalic anhydride, 29.2g 1,6-adipic acid, 95g 1,4-phenylenediethanol, 60.8g 1,6-hexanediol, and 53.5g castor oil.

[0100] The preparation method of the above-mentioned polyester polyol containing aromatic ring structure is as follows: 66.45g of isophthalic acid, 59.3g of phthalic anhydride, 29.2g of 1,6-adipic acid, 95g of 1,4-phenylenediol, 60.8g of 1,6-hexanediol, 53.5g of castor oil, 17.8g of toluene, 1.8g of monobutyltin oxide, and 0.4g of hypophosphite are added to a reaction vessel. Under a nitrogen atmosphere, the polycondensation reaction is carried out at 200℃ and 300rpm for 8h. After the reaction is completed, the toluene is evaporated and removed under a vacuum of -0.09MPa to obtain the product.

[0101] The preparation method of vacuum electroplating UV-curable primer is as follows: Polyester polyol containing aromatic ring structure is mixed with methyl acrylate, butyl acrylate, trimethylolpropane triacrylate, 1-hydroxy-cyclohexyl-phenyl ketone, 4-methoxyphenol, leveling agent BYK373, defoamer BYK088, adhesion promoter 1,2-bistrimethoxysilyl ethane, butyl acetate, and butanone. The mixture is then dispersed at high speed at 1500 rpm / min for 20 min using a high-speed dispersant, followed by ultrasonic defoaming treatment for 20 min to obtain the final product.

[0102] Using the above-mentioned vacuum electroplating UV-curable primer as a primer, a vacuum electroplating coating is prepared on the surface of a glass substrate, with the specific steps being the same as in Example 1.

[0103] Comparative Example 4

[0104] A vacuum electroplating UV-curable primer is composed of the following raw materials: 60g of polyester polyol containing an aliphatic ring structure, 10g of methyl acrylate, 10g of butyl acrylate, 20g of trimethylolpropane triacrylate, 1g of 1-hydroxy-cyclohexyl-phenyl ketone, 0.1g of 4-methoxyphenol, 0.5g of leveling agent BYK373, 0.3g of defoamer BYK088, 2g of adhesion promoter 1,2-bis(trimethoxysilyl)ethane, 50g of butyl acetate, and 50g of butanone.

[0105] The polyester polyol containing aliphatic ring structure is obtained by polycondensation reaction of the following raw materials: 68.9g of 1,4-cyclohexanedicarboxylic acid, 60.9g of tetrahydrophthalic anhydride, 29.2g of 1,6-adipic acid, 86.7g of 1,4-cyclohexanediethanol, and 64g of 1,6-hexanediol.

[0106] The preparation method of the above-mentioned polyester polyol containing aliphatic ring structure is as follows: 68.9g of 11,4-cyclohexanedicarboxylic acid, 60.9g of tetrahydrophthalic anhydride, 29.2g of 1,6-adipic acid, 86.7g of 1,4-cyclohexanediethanol, 64g of 1,6-hexanediol, 17.8g of toluene, 1.8g of monobutyltin oxide, and 0.4g of hypophosphite are added to a reaction vessel. Under a nitrogen atmosphere, the polycondensation reaction is carried out at 200℃ and 300rpm for 8h. After the reaction is completed, the toluene is evaporated and removed under a vacuum of -0.09MPa to obtain the product.

[0107] The preparation method of vacuum electroplating UV-curable primer is as follows: Polyester polyol containing aliphatic ring structure is mixed with methyl acrylate, butyl acrylate, trimethylolpropane triacrylate, 1-hydroxy-cyclohexyl-phenyl ketone, 4-methoxyphenol, leveling agent BYK373, defoamer BYK088, adhesion promoter 1,2-bistrimethoxysilyl ethane, butyl acetate, and butanone. The mixture is then dispersed at high speed at 1500 rpm / min for 20 min using a high-speed dispersant, followed by ultrasonic defoaming treatment for 20 min to obtain the final product.

[0108] Using the above-mentioned vacuum electroplating UV-curable primer as a primer, a vacuum electroplating coating is prepared on the surface of a glass substrate, with the specific steps being the same as in Example 1.

[0109] Test case

[0110] The performance of the vacuum electroplated coatings prepared in the above embodiments and comparative examples was tested. The test items and methods are as follows:

[0111] I. Coating Adhesion Test

[0112] The basic cross-cut adhesion of the above-mentioned vacuum electroplated coating (electroplated coating without any treatment) was tested. The test method was based on the cross-cut test in the national standard GB / T 9286-2021. The average value of the cross-cut test results of the three samples during the formal test is listed in Table 1.

[0113] II. Water Boiling Resistance Test of Coating

[0114] The above-mentioned vacuum electroplated coating was subjected to a water resistance test. The test method is as follows: the vacuum electroplated coating on the glass substrate was immersed in distilled water at 80℃ for 2 hours, and then removed. The integrity of the coating film was observed, and a cross-cut test was further performed. The test method refers to the cross-cut test in the national standard GB / T 9286-2021. The average value of the cross-cut test results of the three samples during the formal test is listed in Table 1.

[0115] III. High Temperature Resistance Test of Coating

[0116] The high-temperature resistance performance of the above-mentioned vacuum electroplated coating was tested according to the high-temperature resistance test method in GB / T 1735-2009. The steps are as follows: The above-mentioned vacuum electroplated coating on the glass substrate was placed in an oven at 180℃ for 2 hours, and then removed. The integrity of the coating film was observed, and a cross-cut test was further performed. The test method was the cross-cut test in national standard GB / T 9286-2021. The average value of the cross-cut test results of the three samples during the formal test is listed in Table 1.

[0117] Table 1

[0118]

[0119] According to Table 1, and in conjunction with Examples 1-9 and Comparative Examples 1-4, it can be seen that the present invention uses appropriate proportions of aliphatic chain diacids and polyols, alicyclic diacids and polyols, and castor oil as polymer monomers. The resulting polyester polyol, synthesized through a polycondensation reaction, is mixed with photoactive diluents, photoinitiators, and other raw materials to obtain a vacuum electroplating UV-curable primer. The polyester polyol does not contain photoactive groups and, as an inert resin, can dilute the density of photoactive groups in the UV primer system, reducing the curing shrinkage rate and shrinkage stress. The alicyclic structure in the polyester polyol can also improve rigidity, giving the coating excellent adhesion, mechanical strength, and hardness. Furthermore, its high glass transition temperature gives the coating good high-temperature deformation resistance. However, it also increases the viscosity of the system, which is detrimental to leveling and coating smoothness, and causes the coating to become brittle and less flexible. Castor oil, with its branched structure and flexible long chains, can reduce viscosity, improve leveling performance and flexibility, and, when combined with the alicyclic structure, gives the coating excellent resistance to boiling and baking, as well as smoothness. Comparative Example 1 uses polyester resins with aliphatic chain and castor oil structures to prepare... The electroplated coating of Comparative Example 1 exhibits low adhesion and poor resistance to boiling and baking. This is due to the aliphatic chain structure, which is flexible but lacks rigidity and has a low glass transition temperature. Consequently, the coating is prone to deformation after boiling and baking, leading to blistering, bubbling, and even peeling. Comparative Example 2, prepared with polyester resin containing a low content of aliphatic rings and castor oil, produces a smooth and flat film. However, the small amount of aliphatic rings is insufficient to provide rigidity, resulting in a low glass transition temperature, a soft film, and low strength. Furthermore, the film is prone to deformation (blistering and bubbling) at high temperatures, leading to adhesion failure. Comparative Example 3 uses a structure containing aromatic rings... Electroplating coatings were prepared using polyester resins with castor oil structures. Although aromatic rings can also provide rigidity to the molecular structure, the rigidity of aromatic rings is too strong, resulting in high viscosity, difficulty in leveling, uneven paint film (orange peel, wrinkles), hard and brittle paint film, easy chipping when scratched, and cracking of the paint film due to thermal expansion and contraction at high temperatures, leading to adhesion failure. The polyester resin in Comparative Example 4 does not contain castor oil structures, resulting in poorer molecular chain flexibility, increased relative rigidity, higher viscosity, poorer leveling, uneven paint film (orange peel), and a harder and more brittle paint film, chipping when scratched, slight cracking of the paint film after high temperatures, and a significant decrease in adhesion.

[0120] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A vacuum electroplating UV-curable primer, characterized in that, The raw materials include the following parts by weight: 30-85 parts of polyester polyol containing aliphatic ring structure, 10-60 parts of reactive diluent, 0.1-5 parts of photoinitiator, 0.01-1 parts of stabilizer, 0.1-5 parts of other additives, and 20-150 parts of solvent; The polyester polyol containing aliphatic ring structure is prepared by polycondensation reaction of diacid component and polyol component, wherein the molar ratio of diacid component and polyol component is 1:0.8~2. The diacid component is composed of aliphatic cyclic diacids and aliphatic chain diacids, wherein the molar amount of aliphatic cyclic diacids is 20% to 95% of the total molar amount of the diacid component; The polyol component is composed of diols and castor oil, wherein the molar amount of castor oil is 2% to 10% of the total molar amount of the polyol component, and the diol is composed of aliphatic cyclic diols and aliphatic chain diols, wherein the molar amount of aliphatic cyclic diols is 20% to 95% of the total molar amount of the diols.

2. The vacuum electroplating UV-curable primer according to claim 1, characterized in that, The preparation method of the polyester polyol containing aliphatic ring structure includes: adding the diacid component, polyol component, dehydrating agent, catalyst, and antioxidant into a reaction vessel, and carrying out a polycondensation reaction at 150~240℃ for 3~12h under a protective atmosphere. After the reaction is completed, the dehydrating agent is removed under vacuum to obtain the product.

3. The vacuum electroplating UV-curable primer according to claim 2, characterized in that, The mass of the dehydrating agent is 5% to 20% of the sum of the masses of the diacid component and the polyol component; the dehydrating agent is selected from at least one of cyclohexane, n-heptane, toluene, and xylene; The mass of the catalyst is 0.1% to 3% of the sum of the masses of the diacid component and the polyol component; the catalyst is selected from at least one of zinc acetate, cobalt acetate, antimony trioxide, monobutyltin oxide, dibutyltin oxide, methanesulfonic acid, p-methylbenzenesulfonic acid, tetrabutyl titanate, and tetraisobutyl titanate. The antioxidant is 0.05% to 0.5% of the sum of the masses of the diacid component and the polyol component; the antioxidant is selected from at least one of hypophosphite and phosphite antioxidants.

4. The vacuum electroplating UV-curable primer according to claim 1, characterized in that, The aliphatic cyclic dicarboxylic acid is selected from at least one of 1,4-cyclohexanedicarboxylic acid, tetrahydrophthalic anhydride, and hexahydrophthalic anhydride. The fatty chain dicarboxylic acid is selected from at least one of succinic acid, glutaric acid, adipic acid, azelaic acid, sebacic acid, and isononanoic acid; The aliphatic cyclic diol is selected from at least one of 1,4-cyclohexanediol and hydrogenated bisphenol A; The aliphatic chain diol is selected from at least one of ethylene glycol, ethylene glycol monohydrate, 1,2-propanediol, 2-methyl-1,3-propanediol, dipropylene glycol monohydrate, 1,3-propanediol, 1,3-butanediol, 2,3-butanediol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, diethylene glycol, triethylene glycol, 1,9-nonanediol, 1,10-decanediol, 1,11-undecanediol, 1,12-dodecanediol, 1,14-tetradecanediol, 2-butyl-2-ethyl-1,3-propanediol, and 2-ethyl-3-propyl-1,3-propanediol.

5. The vacuum electroplating UV-curable primer according to claim 1, characterized in that, The reactive diluent is selected from at least one of methyl acrylate, butyl acrylate, isodecyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, glycidyl methacrylate, isobornyl acrylate, tetrahydrofuran acrylate, N-vinylpyrrolidone, dipropylene glycol diacrylate, tripropylene glycol diacrylate, 1,6-hexanediol diacrylate, neopentyl glycol diacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated glycerol triacrylate, pentaerythritol triacrylate, dimethylolpropane tetraacrylate, and dipentaerythritol hexaacrylate.

6. The vacuum electroplating UV-curable primer according to claim 1, characterized in that, The photoinitiator is selected from at least one of 1-hydroxy-cyclohexyl-phenyl ketone, 2-hydroxy-methylphenylpropane-1-one, 2-methyl-2-(4-morpholino)-1-(4-methylthiophenyl)-1-propanone, 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylphenylpropanone, methyl benzoylformate, benzoin dimethyl ketal, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, benzophenone, isopropylthioxanthraphenone, and 4-methylbenzophenone.

7. The vacuum electroplating UV-curable primer according to claim 1, characterized in that, The stabilizer is selected from at least one of 4-methoxyphenol, p-hydroxyanisole, hydroquinone, 2,6-di-tert-butyl-p-cresol, pyrogallol, and resorcinol.

8. The vacuum electroplating UV-curable primer according to claim 1, characterized in that, The other additives are selected from at least one of leveling agents, defoamers, and adhesion promoters.

9. The vacuum electroplating UV-curable primer according to claim 1, characterized in that, The solvent is selected from at least one of ethanol, isopropanol, ethyl acetate, butyl acetate, acetone, butanone, toluene, xylene, ethylene glycol ethyl ether, propylene glycol methyl ether, and propylene glycol butyl ether.

10. A method for preparing a vacuum electroplating UV-curable primer as described in any one of claims 1 to 9, characterized in that, The process includes the following steps: mixing a polyester polyol containing an aliphatic ring structure with an active diluent, a photoinitiator, a stabilizer, other additives and a solvent, dispersing the mixture at high speed, and then performing a defoaming treatment to obtain the final product.

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