Anti-aging UV vacuum electroplating coating and preparation method thereof

Abstract

The invention belongs to the technical field of coatings, and particularly relates to an anti-aging UV vacuum electroplating coating and a preparation method thereof.The anti-aging UV vacuum electroplating coating is composed of a primer and a finish paint, the primer is prepared from the following raw materials: 60 to 80 parts of polyurethane prepolymer resin, 10 to 15 parts of active monomer, 2 to 10 parts of active diluent, 1 to 10 parts of photoinitiator, 0.1 to 0.5 part of adhesion promoter and 20 to 40 parts of solvent; the finish paint is prepared from the following raw materials in parts by weight: 40 to 55 parts of polyurethane prepolymer resin, 30 to 45 parts of active monomer, 2 to 5 parts of photoinitiator, 0.1 to 1 part of flatting agent and 10 to 30 parts of solvent. The UV vacuum electroplating coating prepared by the invention has good adhesive force and aging resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to an ageing-resistant UV vacuum electroplating coating and a preparation method thereof. Background Art

[0002] Vacuum coating refers to the evaporation of high-purity metal into gas under high vacuum conditions, and the gaseous metal atoms are deposited on the surface of the substrate to form a thin film with bright metallic color. The vacuum electroplated film can give the substrate a strong metallic texture, high brightness, fine texture, beautiful color, and improve the ornamental and artistic quality. At the same time, the production cost is low and it is widely used in the automotive industry. Vacuum coating UV coatings are generally composed of UV primer and UV topcoat. UV primer can improve the adhesion between the substrate and the coating, improve the surface smoothness of the coating, and seal the small molecules in the substrate; UV topcoat can improve the fullness and gloss of the substrate, increase the hardness and wear resistance of the film layer, protect the metal layer, and improve the chemical resistance of the film layer. In order to match the development of electroplating technology and more application options, some vacuum coating UV coatings also contain a midcoat.

[0003] The invention patent with the publication number CN102167950A discloses a vacuum electroplating coating and its preparation and construction method. The vacuum electroplating coating is composed of a primer, a mid-coat and a topcoat. The components of the primer are polyurethane acrylate resin, acrylate, photoinitiator, organosiloxane leveling agent, butyl acetate, ethyl acetate and isopropanol; the components of the mid-coat are polyester-modified polyurethane acrylate resin, polyurethane acrylate resin, phosphate acrylate, photoinitiator, butyl acetate, ethyl acetate and isopropanol; the components of the topcoat are polyurethane acrylate resin, acrylate, phosphate acrylate, photoinitiator, organosiloxane leveling agent, butyl acetate, ethyl acetate and isopropanol. The invention uses imported environmentally friendly raw materials with low toxicity; the production process does not have a high temperature and high pressure process, and has high safety; no dilution is required, and it is convenient to use directly; all are UV-cured, and the production efficiency is high.

[0004] However, the polyurethane acrylate resin added to its topcoat has insufficient environmental aging resistance. At the same time, when the vacuum electroplating coating is used in the automotive industry, the adhesion of its primer to the substrate also has room for further improvement. Summary of the invention

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides an aging-resistant UV vacuum electroplating coating and a preparation method thereof. The UV vacuum electroplating coating prepared by the present invention has good adhesion and aging resistance.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] The first aspect of the present invention provides an aging-resistant UV vacuum electroplating coating, which consists of a primer and a topcoat. The primer contains the following raw materials, in parts by weight: 60 to 80 parts of a polyurethane prepolymer resin, 10 to 15 parts of an active monomer, 2 to 10 parts of an active diluent, 1 to 10 parts of a photoinitiator, 0.1 to 0.5 parts of an adhesion promoter, and 20 to 40 parts of a solvent; the topcoat contains the following raw materials: 40 to 55 parts of a polyurethane prepolymer resin, 30 to 45 parts of an active monomer, 2 to 5 parts of a photoinitiator, 0.1 to 1 parts of a leveling agent, and 10 to 30 parts of a solvent.

[0008] In some embodiments of the present invention, the method for preparing the polyurethane prepolymer resin comprises the following steps:

[0009] Add polyol under stirring, heat to 100-110°C, dehydrate under reduced pressure for 2-3 hours, cool to 55-60°C, add isocyanate and catalyst, heat to 80-95°C and react for 1-3 hours, then add modifier and react at constant temperature for 2-4 hours to obtain polyurethane prepolymer resin.

[0010] In some embodiments of the present invention, the polyol is a silicone polyol.

[0011] In some embodiments of the present invention, the modifier is a mixture of 1,6-hexanediol diacrylate and lauryl methacrylate.

[0012] In some embodiments of the present invention, the mass ratio of 1,6-hexanediol diacrylate to lauryl methacrylate is 1:(0.4-0.8).

[0013] In some embodiments of the present invention, the mass ratio of the polyol, isocyanate and modifier is 1:(0.3-0.5):(0.1-0.3).

[0014] The polyurethane prepolymer resin prepared by the present invention may react with isocyanate due to the introduction of active groups. By introducing a long-chain acrylate structure into the prepolymer system, the main chain breakage or degradation of the cross-linking system is further suppressed through steric hindrance, thereby effectively improving the aging resistance of the coating; secondly, the modified compound containing active groups contains abundant oxygen atoms, so that it can coordinate with the metal substrate obtained by vacuum electroplating to form a coordination bond, and the adhesion promoter in the system synergistically improves the bonding strength of the coating.

[0015] In some embodiments of the present invention, the method for preparing the adhesion promoter comprises the following steps:

[0016] (1) Under an inert atmosphere, allyl glycol and ε-caprolactone are mixed, a catalyst is added, the temperature is raised to 160-180° C., and the reaction is carried out for 1-3 hours to obtain an intermediate;

[0017] (2) Acrylic acid, 2-methyl-2-acrylic acid-2-hydroxyethyl ester phosphate and methacrylate are mixed and added to an organic solvent, and then an initiator and the intermediate of step (1) are added, the temperature is raised to 65-75° C., the reaction is carried out for 1-3 hours, and the pH is adjusted to 7-9 to obtain an adhesion promoter.

[0018] In some embodiments of the present invention, in step (1), the mass ratio of allyl glycol to ε-caprolactone is 1:(0.8-1.7).

[0019] In some embodiments of the present invention, in step (2), the mass ratio of the acrylic acid to the intermediate of step (1) is 1:(0.1-0.5).

[0020] In some embodiments of the present invention, in step (2), the mass ratio of acrylic acid, 2-methyl-2-propylene acid-2-hydroxyethyl phosphate, and methacrylate is 1:(0.3-0.7):(0.4-0.6).

[0021] The adhesion promoter prepared by the present invention uses acrylic acid, 2-methyl-2-acrylic acid-2-hydroxyethyl phosphate, methacrylate and a specially prepared intermediate as raw materials for polymerization reaction. Compared with the adhesion promoter in the prior art, the adhesion promoter prepared by the present invention may increase the compatibility of various components of the coating by balancing polarity due to the introduction of ε-caprolactone, and the introduction of a branched structure on the intermediate provides more action points, and enables the active groups in various components of the system to be in closer contact with the substrate. Through the multiple effects of chemical crosslinking and physical adsorption, the adhesion and bonding strength of various components of the coating to the metal substrate obtained by vacuum electroplating are significantly enhanced.

[0022] In some embodiments of the present invention, the reactive monomers are dipentaerythritol pentaacrylate and / or dipentaerythritol hexaacrylate.

[0023] In some embodiments of the present invention, the reactive diluent is β-hydroxyethyl methacrylate or isobornyl acrylate.

[0024] In some embodiments of the present invention, the photoinitiators are all photoinitiator 184.

[0025] In some embodiments of the present invention, the leveling agent is BYK-306.

[0026] In some embodiments of the present invention, the solvent is ethyl acetate or isobutanol.

[0027] A second aspect of the present invention provides a method for preparing an aging-resistant UV vacuum electroplating coating, comprising the following steps:

[0028] S1: The preparation steps of the primer are as follows: transfer the polyurethane prepolymer resin, the active monomer and the active diluent to the first weight portion of the solvent, stir for 10 to 20 minutes, then add the photoinitiator, the leveling agent and the adhesion promoter, stir for 10 to 20 minutes, then add the remaining amount of the solvent, and stir to obtain;

[0029] S2: The preparation steps of the topcoat are as follows: mix the polyurethane prepolymer resin, the active monomer and the solvent, stir for 20 to 30 minutes, then add the photoinitiator and the leveling agent, and stir for 10 to 20 minutes.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The present invention prepares a primer of UV vacuum plating coating by modifying polyurethane prepolymer resin and adhesion promoter, and then uses active monomer, active diluent and other auxiliary components to prepare topcoat of UV vacuum plating coating. The UV vacuum plating coating disclosed by the present invention has good adhesion and aging resistance.

[0032] 2. The polyurethane prepolymer resin prepared by the present invention may be able to react with isocyanate due to the introduction of active groups, and a long-chain acrylate structure with large steric hindrance is introduced into the prepolymer system, which further inhibits the breakage or degradation of the main chain of the cross-linking system and increases the aging resistance of the coating; secondly, the modified compound containing active groups contains abundant O atoms, which enables it to coordinate with the metal substrate obtained by vacuum electroplating to form a coordination bond, and the adhesion promoter in the system synergistically improves the bonding strength of the coating.

[0033] 3. The adhesion promoter prepared by the present invention uses acrylic acid, 2-methyl-2-acrylic acid-2-hydroxyethyl ester phosphate, methacrylate and a specially prepared intermediate as raw materials for polymerization reaction. The introduction of ε-caprolactone and branched structure on the intermediate significantly enhances the adhesion and bonding strength of each component of the coating to the metal substrate obtained by vacuum electroplating. DETAILED DESCRIPTION

[0034] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following examples and comparative examples are only used to illustrate the present invention and are not intended to limit the present invention. Other combinations and various modifications within the concept of the present invention may be performed without departing from the spirit or scope of the present invention.

[0035] In order to facilitate those skilled in the art to implement the present invention, some raw materials and manufacturers of the embodiments and comparative examples are described as follows:

[0036] The compounds and related reagents used in the following examples and comparative examples can all be purchased from the market, wherein the number average molecular weight of the polysiloxane polyol used is 2000 and the functionality is 3.

[0037] Preparation Example 1

[0038] The preparation method of polyurethane prepolymer resin comprises the following steps:

[0039] Add 5g of polysiloxane polyol under stirring, heat to 110°C, dehydrate under reduced pressure for 2h, cool to 60°C, add 2g of isocyanate and 0.0003g of dibutyltin dilaurate, heat to 85°C and react for 2h, then add 0.62g of 1,6-hexanediol diacrylate and 0.38g of lauryl methacrylate, react at constant temperature for 3h to obtain a polyurethane prepolymer resin.

[0040] Preparation Example 2

[0041] The preparation method of the polyurethane prepolymer resin has the same specific steps as Preparation Example 1, except that 1.25 g of 1,6-hexanediol diacrylate and 0.75 g of lauryl methacrylate are added.

[0042] Preparation Example 3

[0043] The preparation method of the polyurethane prepolymer resin has the same specific steps as Preparation Example 1, except that 0.53 g of 1,6-hexanediol diacrylate and 0.47 g of lauryl methacrylate are added.

[0044] Preparation Example 4

[0045] The preparation method of the adhesion promoter comprises the following steps:

[0046] (1) Under a nitrogen atmosphere, 2 g of allyl glycol and 2.6 g of ε-caprolactone were mixed, 0.005 g of tetrabutyl titanate was added, the temperature was raised to 170° C., and the reaction was carried out for 2 h to obtain an intermediate;

[0047] (2) 1 g of acrylic acid, 0.5 g of 2-methyl-2-acrylic acid-2-hydroxyethyl ester phosphate, and 0.5 g of methacrylate were mixed and added to 15 mL of toluene, and then 0.02 g of ammonium persulfate and 0.3 g of the intermediate of step (1) were added, the temperature was raised to 70° C., the reaction was carried out for 2 h, and the pH was adjusted to 8 to obtain an adhesion promoter.

[0048] Preparation Example 5

[0049] The preparation method of the adhesion promoter is the same as that of Preparation Example 4, except that the amount of ε-caprolactone added in step (1) is 3.8 g.

[0050] Preparation Example 6

[0051] The preparation method of the adhesion promoter has the same specific steps as those of Preparation Example 4, except that the amount of the intermediate added in step (2) is 0.7 g.

[0052] Preparation Example 7

[0053] The preparation steps of the primer are as follows:

[0054] In parts by weight, 70 parts of polyurethane prepolymer resin, 13 parts of dipentaerythritol pentaacrylate and 6 parts of isobornyl acrylate were mixed and transferred to 15 parts of ethyl acetate, stirred at 700 r / min for 15 minutes, and then 6 parts of photoinitiator 184 and 0.3 parts of adhesion promoter were added, stirred at 700 r / min for 15 minutes, and then 15 parts of ethyl acetate were added and stirred to obtain;

[0055] The polyurethane prepolymer resin used in this preparation example is obtained from Preparation Example 1, and the adhesion promoter is obtained from Preparation Example 4.

[0056] Preparation Example 8

[0057] The preparation steps of the primer are as follows:

[0058] In parts by weight, 60 parts of polyurethane prepolymer resin, 10 parts of dipentaerythritol pentaacrylate and 2 parts of isobornyl acrylate were mixed and transferred to 10 parts of ethyl acetate, stirred at 700 r / min for 15 minutes, then 1 part of photoinitiator 184 and 0.1 part of adhesion promoter were added, stirred at 700 r / min for 15 minutes, and then 10 parts of ethyl acetate were added and stirred to obtain;

[0059] The polyurethane prepolymer resin used in this preparation example is obtained from Preparation Example 1, and the adhesion promoter is obtained from Preparation Example 4.

[0060] Preparation Example 9

[0061] The preparation steps of the primer are as follows:

[0062] In parts by weight, 80 parts of polyurethane prepolymer resin, 15 parts of dipentaerythritol pentaacrylate and 10 parts of isobornyl acrylate were mixed and transferred to 20 parts of ethyl acetate, stirred at 700 r / min for 15 minutes, then 10 parts of photoinitiator 184 and 0.5 parts of adhesion promoter were added, stirred at 700 r / min for 15 minutes, and then 20 parts of ethyl acetate were added and stirred to obtain;

[0063] The polyurethane prepolymer resin used in this preparation example is obtained from Preparation Example 1, and the adhesion promoter is obtained from Preparation Example 4.

[0064] Preparation Example 10

[0065] The preparation steps of topcoat are as follows:

[0066] In parts by weight, 45 parts of polyurethane prepolymer resin, 35 parts of dipentaerythritol hexaacrylate and 20 parts of isobutyl alcohol were mixed, stirred at 800 r / min for 25 minutes, and then 3 parts of photoinitiator 184 and 0.5 parts of BYK-306 were added, and stirred at 800 r / min for 15 minutes to obtain;

[0067] The polyurethane prepolymer resin used in this preparation example is obtained from Preparation Example 1.

[0068] Preparation Example 11

[0069] The preparation steps of topcoat are as follows:

[0070] In parts by weight, 40 parts of polyurethane prepolymer resin, 30 parts of dipentaerythritol hexaacrylate and 10 parts of isobutyl alcohol were mixed, stirred at 800 r / min for 25 minutes, and then 2 parts of photoinitiator 184 and 0.1 parts of BYK-306 were added, and stirred at 800 r / min for 15 minutes to obtain;

[0071] The polyurethane prepolymer resin used in this preparation example is obtained from Preparation Example 1.

[0072] Preparation Example 12

[0073] The preparation steps of topcoat are as follows:

[0074] In parts by weight, 55 parts of polyurethane prepolymer resin, 45 parts of dipentaerythritol hexaacrylate and 30 parts of isobutyl alcohol were mixed, stirred at 800 r / min for 25 minutes, and then 5 parts of photoinitiator 184 and 1 part of BYK-306 were added, and stirred at 800 r / min for 15 minutes to obtain;

[0075] The polyurethane prepolymer resin used in this preparation example is obtained from Preparation Example 1.

[0076] Preparation Example 13

[0077] The specific preparation steps of the topcoat are the same as those of Preparation Example 10, except that the polyurethane prepolymer resin used in this Preparation Example is obtained from Preparation Example 2.

[0078] Preparation Example 14

[0079] The specific preparation steps of the topcoat are the same as those of Preparation Example 10, except that the polyurethane prepolymer resin used in this Preparation Example is obtained from Preparation Example 3.

[0080] Preparation Example 15

[0081] The specific preparation steps of the primer are the same as those of Preparation Example 7, except that the adhesion promoter used in this Preparation Example is obtained from Preparation Example 5.

[0082] Preparation Example 16

[0083] The specific preparation steps of the primer are the same as those of Preparation Example 7, except that the adhesion promoter used in this Preparation Example is obtained from Preparation Example 6.

[0084] Preparation Example 17

[0085] The specific preparation steps of the topcoat are the same as those of Preparation Example 10, except that in this Preparation Example, an equal amount of commercially available polyurethane prepolymer resin (model 230A2) is used to replace the polyurethane prepolymer resin obtained in Preparation Example 1.

[0086] Preparation Example 18

[0087] The specific preparation steps of the primer are the same as those of Preparation Example 7, except that the adhesion promoter obtained in Preparation Example 4 is replaced by an equal amount of a commercially available adhesion promoter (model HY-4127) in this Preparation Example.

[0088] Example 1

[0089] An aging-resistant UV vacuum electroplating coating consists of a primer and a topcoat. The primer used in this embodiment is obtained from Preparation Example 7, and the topcoat is obtained from Preparation Example 10.

[0090] Example 2

[0091] An aging-resistant UV vacuum electroplating coating consists of a primer and a topcoat. The primer used in this embodiment is obtained from Preparation Example 8, and the topcoat is obtained from Preparation Example 11.

[0092] Example 3

[0093] An aging-resistant UV vacuum electroplating coating consists of a primer and a topcoat. The primer used in this embodiment is obtained from Preparation Example 9, and the topcoat is obtained from Preparation Example 12.

[0094] Example 4

[0095] An aging-resistant UV vacuum electroplating coating, the specific implementation method is the same as Example 1, the difference is that the topcoat used in this example is obtained from Preparation Example 13.

[0096] Example 5

[0097] An aging-resistant UV vacuum electroplating coating, the specific implementation method is the same as Example 1, the difference is that the topcoat used in this example is obtained from Preparation Example 14.

[0098] Example 6

[0099] An aging-resistant UV vacuum electroplating coating, the specific implementation method is the same as Example 1, the difference is that the primer used in this example is obtained from Preparation Example 15.

[0100] Example 7

[0101] An aging-resistant UV vacuum electroplating coating, the specific implementation method is the same as Example 1, the difference is that the primer used in this example is obtained from Preparation Example 16.

[0102] Example 8

[0103] A UV vacuum electroplating coating with anti-aging properties, the specific implementation method is the same as that of Example 1, except that the topcoat used in this example is obtained from Preparation Example 17.

[0104] Example 9

[0105] An aging-resistant UV vacuum electroplating coating, the specific implementation method is the same as Example 1, the difference is that the primer used in this example is obtained from Preparation Example 18.

[0106] Example 10

[0107] An aging-resistant UV vacuum electroplating coating, the specific implementation method is the same as Example 1, the difference is that the primer used in this example is obtained from Preparation Example 16.

[0108] Performance Testing:

[0109] Take the UV vacuum plating coating prepared in each example, spray the primer (film thickness 15 μm) on the metal substrate, and wait for the primer to be UV cured (UV energy 1300 mJ / cm 2 ) and then spray the topcoat (film thickness 15μm), and then UV curing (UV energy 1600mJ / cm 2 ), and the coating was subjected to the following performance tests:

[0110] 1. Aging resistance

[0111] The aging resistance of the UV vacuum plating coating prepared in each embodiment was tested according to GMW14797. The coatings were tested for wrinkling, peeling, powdering and other undesirable phenomena at 1000 hrs and above, and the color difference value ΔE was recorded.

[0112] 2. Adhesion performance

[0113] The adhesion between the coating of the UV vacuum plating coating prepared in each embodiment and the PVD coating was tested by a 100-grid test with reference to GB / T 9286-1998.

[0114] The test results are shown in Table 1.

[0115] Table 1

[0116]

[0117] By comparing the data of Examples 1-3 in Table 1, it can be seen that the coating obtained by the UV vacuum electroplating coating of the present invention has excellent aging resistance and excellent adhesion; by comparing Examples 4 and 5 with Example 1, it can be seen that when the amount of the modifier used in preparing the polyurethane prepolymer resin and the mass ratio of 1,6-hexanediol diacrylate and lauryl methacrylate in the modifier are changed, the polymerization reaction of the polyurethane prepolymer resin will be insufficient, and its inhibitory effect on the rupture or degradation of the main chain of the cross-linking system will be weakened, resulting in a decrease in the aging resistance of the coating, and the coating will wrinkle and peel; by comparing Example 6 , Example 7 is compared with Example 1, and it can be seen that when the addition amounts of ε-caprolactone and the intermediate are changed respectively during the preparation of the adhesion promoter, the close contact between the active groups of the system and the metal substrate is affected, and the adhesion of the coating is reduced; Example 8 is compared with Example 1, and it can be seen that when the topcoat directly uses commercially available polyurethane prepolymer resin, it is easy to have uneven distribution, which in turn affects the aging resistance of the coating, and causes undesirable phenomena such as wrinkling, peeling, and powdering; Example 9 is compared with Example 1, and it can be seen that the direct use of commercially available adhesion promoters leads to insufficient bonding strength and thus a significant decrease in the adhesion of the coating.

[0118] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An aging-resistant UV vacuum plating coating, characterized in that: The UV vacuum electroplating coating consists of a primer and a topcoat. The primer contains the following raw materials, in parts by weight: 60 to 80 parts of polyurethane prepolymer resin, 10 to 15 parts of active monomers, 2 to 10 parts of active diluents, 1 to 10 parts of photoinitiators, 0.1 to 0.5 parts of adhesion promoters and 20 to 40 parts of solvents; the topcoat contains the following raw materials: 40 to 55 parts of polyurethane prepolymer resin, 30 to 45 parts of active monomers, 2 to 5 parts of photoinitiators, 0.1 to 1 parts of leveling agents and 10 to 30 parts of solvents.

2. The aging-resistant UV vacuum plating coating according to claim 1, characterized in that: The preparation method of the polyurethane prepolymer resin comprises the following steps: Add polyol under stirring, heat to 100-110°C, dehydrate under reduced pressure for 2-3 hours, cool to 55-60°C, add isocyanate and catalyst, heat to 80-95°C and react for 1-3 hours, then add modifier and react at constant temperature for 2-4 hours to obtain polyurethane prepolymer resin.

3. The aging-resistant UV vacuum plating coating according to claim 2, characterized in that: The polyol is polysiloxane polyol.

4. The aging-resistant UV vacuum plating coating according to claim 2, characterized in that: The modifier is a mixture of 1,6-hexanediol diacrylate and lauryl methacrylate.

5. The aging-resistant UV vacuum plating coating according to claim 2, characterized in that: The mass ratio of the polyol, isocyanate and modifier is 1:(0.3-0.5):(0.1-0.3).

6. The aging-resistant UV vacuum plating coating according to claim 1, characterized in that: The preparation method of the adhesion promoter comprises the following steps: (1) Under an inert atmosphere, allyl glycol and ε-caprolactone are mixed, a catalyst is added, the temperature is raised to 160-180° C., and the reaction is carried out for 1-3 hours to obtain an intermediate; (2) Acrylic acid, 2-methyl-2-acrylic acid-2-hydroxyethyl ester phosphate and methacrylate are mixed and added to an organic solvent, and then an initiator and the intermediate of step (1) are added, the temperature is raised to 65-75° C., the reaction is carried out for 1-3 hours, and the pH is adjusted to 7-9 to obtain an adhesion promoter.

7. The aging-resistant UV vacuum plating coating according to claim 6, characterized in that: In step (1), the mass ratio of allyl glycol to ε-caprolactone is 1:(0.8-1.7).

8. The aging-resistant UV vacuum plating coating according to claim 6, characterized in that: In step (2), the mass ratio of the acrylic acid to the intermediate of step (1) is 1:(0.1-0.5).

9. The aging-resistant UV vacuum plating coating according to claim 1, characterized in that: The active monomer is dipentaerythritol pentaacrylate and / or dipentaerythritol hexaacrylate.

10. A method for preparing the aging-resistant UV vacuum electroplating coating according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: The preparation steps of the primer are as follows: transfer the polyurethane prepolymer resin, the active monomer and the active diluent to the first weight portion of the solvent, stir for 10 to 20 minutes, then add the photoinitiator, the leveling agent and the adhesion promoter, stir for 10 to 20 minutes, then add the remaining amount of the solvent, and stir to obtain; S2: The preparation steps of the topcoat are as follows: mix the polyurethane prepolymer resin, the active monomer and the solvent, stir for 20 to 30 minutes, then add the photoinitiator and the leveling agent, and stir for 10 to 20 minutes.

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