An evaporation nickel plating coating for interior and exterior trim of new energy vehicles and its preparation method

Abstract

The present invention relates to an electroless nickel plating paint for interior and exterior trim of new energy vehicles and a preparation method thereof, belonging to the technical field of automotive paints. The paint provided by the present invention comprises a primer and a topcoat; by mass percentage, the primer comprises the following components: 25-35% acrylic resin, 15-20% acrylate monomer, 3-8% photoinitiator, 0.1-0.3% additive, and the balance is solvent; by mass percentage, the topcoat comprises the following components: 20-35% solvent-modified acrylate, 8-15% polyurethane acrylate resin, 5-15% reactive monomer, 2-5% photoinitiator, 0.1-0.3% additive, and the balance is solvent. The paint provided by the present invention can be applied in the nickel plating process, improving the adhesion of the nickel coating on the substrate, protecting the nickel coating, enhancing its weather resistance and avoiding fogging, and has high value in plastic metallization and automotive lightweight processes.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive coatings, and particularly to an electroless nickel plating coating for interior and exterior trim of new energy vehicles and a preparation method thereof. Background Art

[0002] The battery endurance of new energy vehicles is a quite important indicator. Automobile lightweighting means that on the premise of ensuring the strength and safety factor of the vehicle, every effort is made to reduce the curb weight of the vehicle, which will improve the power performance of the vehicle and shorten the fuel consumption and power consumption. Lightweight materials such as aluminum, magnesium, ceramics, plastics, etc. can be used to achieve automobile lightweighting, reduce the weight of the vehicle itself, and improve output power, noise, handling and reliability, speed, fuel consumption, exhaust emissions and safety factor, etc. Making the surface of plastic parts have a metallic texture is a feasible way to ensure lightweighting and achieve a cool appearance of the vehicle.

[0003] The plastic metallization process usually applies a primer before coating, and then deposits a metal film on the plastic surface. After coating, intermediate paint and topcoat are applied, etc. to protect the coating layer. Coating is generally carried out by vacuum electroplating: under vacuum conditions, through distillation or sputtering, etc., by evaporation and condensation of metal filaments, a very thin surface metal coating is adhered to the surface of plastic parts, with fast speed and good adhesion. The vacuum coating on the surface of plastic parts has functionality and decoration, making the plastic surface have a metallic luster and can be made into different colors according to actual decoration needs, and can well replace the water-plated parts in the existing automotive interior and exterior trim.

[0004] Currently, the most commonly used coating materials for vacuum electroplating are aluminum, indium tin, etc. And metallic nickel has relatively high chemical stability, and its stability and corrosion resistance are better than those of commonly used vacuum electroplating materials. Electroless nickel plating can be used as a protective decorative coating to protect the substrate material from corrosion and play a bright decorative role. However, in the actual electroless nickel plating process for interior and exterior trim of new energy vehicles, due to the existing paint systems mainly developing coatings for coatings such as aluminum plating and indium tin plating, when applied to the above-mentioned nickel plating process, problems such as fogging of the coating, paint peeling, and poor weather resistance in tests are likely to occur.

[0005] Therefore, developing an electroless nickel plating coating that can be applied to the nickel plating process of automotive interior and exterior trim parts, overcoming the problems of fogging and paint peeling of the nickel coating, and having good weather resistance and practicability of the coating, has high application value in the field of new energy vehicles. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an electroless nickel plating coating for interior and exterior trim of new energy vehicles and a preparation method thereof, which can improve the adhesion of the nickel coating on the substrate, protect the nickel coating, enhance its weather resistance, and avoid fogging, and has high value in the plastic metallization and automobile lightweighting processes.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] In a first aspect, the present invention provides an electroless nickel plating paint for interior and exterior trim of new energy vehicles, and the paint includes a primer and a topcoat.

[0009] By mass percentage, the primer includes the following components: 25-35% acrylic resin, 15-20% trifunctional acrylate monomer, 3-8% photoinitiator, and the balance is solvent; the acrylic resin is a mixture of difunctional polyurethane acrylate resin, difunctional epoxy acrylate resin, and hexafunctional polyurethane acrylate resin.

[0010] By mass percentage, the topcoat includes the following components: 20-35% solvent-modified acrylate, 8-15% hexafunctional polyurethane acrylate resin, 5-15% reactive monomer, 2-5% photoinitiator, and the balance is solvent; the reactive monomer is a mixture of monofunctional acrylate monomer, trifunctional acrylate monomer, hexafunctional acrylate monomer, and phosphate monomer.

[0011] Spray the above primer on the substrate and use it as the coating carrier for electroless nickel plating; use the acrylic resin with the above specific ratio, in which the epoxy acrylate resin can improve the adhesion of the primer to the substrate and has good plating performance; the combination of the acrylic resin and the acrylate reactive monomer can help the nickel coating to be well sprayed and fixed on the primer, realizing the metallic texture of the substrate; at the same time, it improves the overall weather resistance, boiling water resistance, and adhesion of the coating. Changing the component ratio of the acrylic resin in the primer may result in poor overall adhesion of the coating and paint peeling off at room temperature. If directly sprayed on the substrate, the coating will peel off.

[0012] After electroless nickel plating, spray the above specific topcoat on the coating, and the primer, coating, and topcoat together form the coating.

[0013] Using the above specific ratio of solvent-modified acrylate and polyurethane acrylate resin can improve the adhesion of the topcoat to the nickel coating. Combining with specific reactive monomers acrylate monomers and phosphate monomers, the topcoat can firmly adhere to the nickel coating, prevent the coating from corroding and discoloring in a humid environment, and the coating from discoloring and cracking at high temperature, playing a protective role for the coating and improving the overall weather resistance of the coating. Changing the ratio of the solvent-modified acrylate may significantly reduce the adhesion of the topcoat, resulting in serious fogging during use. If the topcoat is not used, the coating stability is poor, and it is extremely easy to oxidize and be damaged. Using other special functional acrylates to replace the solvent-modified acrylate may cause serious fogging of the coating in a high-temperature and high-humidity environment.

[0014] The present invention adopts the above-mentioned specific combination of primer and topcoat, which can be applied to the nickel coating preparation process consisting of primer + nickel plating layer + topcoat, and can well form a coating with good performance, realize the plastic metallization texture, and jointly form a coating with good adhesion to the substrate, strong weather resistance, meeting the appearance requirements, and realizing the appearance requirements of metallization. It has high application prospects in the lightweight process of new energy vehicles.

[0015] Preferably, the primer further includes an additive; preferably, by mass percentage, the primer includes the following components: 26-30% acrylic resin, 18% acrylate monomer, 5.5% photoinitiator, 0.1-0.3% additive, and the balance is solvent. The additive leveling agent is used to help film formation; the combination of acrylic resin and acrylate monomer under the above ratio can further improve the adhesion of the primer, avoid corrosion, paint peeling and falling off in high-temperature and humid environments, and improve the weather resistance and practicability of the formed coating. Reducing the amount of acrylic resin will reduce the weather resistance; increasing the amount of acrylic resin will be unfavorable for construction.

[0016] Preferably, in the primer, the difunctional epoxy acrylate resin is bisphenol A epoxy acrylate resin, and the trifunctional acrylate monomer is a mixture of trimethylolpropane triacrylate and pentaerythritol triacrylate. The combination of the above-mentioned specific polyfunctional acrylic resin and trifunctional acrylate monomer can better control the hardness and adhesion performance of the primer, and avoid primer cracking and peeling.

[0017] More preferably, in the primer, the mass ratio of difunctional polyurethane acrylate resin, difunctional epoxy acrylate resin and hexafunctional polyurethane acrylate resin is difunctional polyurethane acrylate resin: difunctional epoxy acrylate resin: hexafunctional polyurethane acrylate resin = 10:13:3. This ratio can ensure the adhesion of the primer to the substrate and the plating property, better combine with the plating layer, and comprehensively improve the adhesion performance of the coating after boiling water and high-temperature and high-humidity treatment. Changing this ratio may significantly reduce the adhesion and the weather resistance may become worse.

[0018] Preferably, the topcoat further includes an additive; preferably, by mass percentage, the topcoat includes the following components: 30-35% solvent-modified acrylate, 8-15% polyurethane acrylate resin, 12-15% reactive monomer, 2.5% photoinitiator, 0.1-0.3% additive, and the balance is solvent. The additive leveling agent is used to help the coating form a better film; the topcoat with this specific ratio can better combine with the plating layer and the primer, and can further reduce the paint peeling, fogging and discoloration of the plating layer after high-temperature and high-humidity treatment. Reducing the amount of solvent-modified acrylate will cause the topcoat to easily peel off on the plating layer; continuously increasing the amount of solvent-modified acrylate will instead reduce the weather resistance.

[0019] Preferably, in the topcoat, the reactive monomers are a mixture of methacrylated phosphate, dipentaerythritol hexaacrylate, isobornyl acrylate, and pentaerythritol triacrylate.

[0020] More preferably, in the topcoat: the mass ratio of the hexa-functional polyurethane acrylate resin, the mono-functional acrylate monomer, and the tri-functional acrylate monomer is (2.5 - 6.4):1:1.

[0021] The above polyurethane acrylate resin is used in combination with specific reactive monomers, and by controlling the mass ratio of the hexa-functional polyurethane acrylate resin, the mono-functional acrylate monomer, and the tri-functional acrylate monomer, it is possible to better adjust the performance of the topcoat while ensuring the adhesion of the topcoat, preventing it from being too brittle and chipping at room temperature, and being unable to provide a protective effect.

[0022] Preferably, the primer is prepared by the following steps:

[0023] (1) Add acrylate monomers and acrylic resins to an organic solvent, and stir at 800 r / min for 60 min to mix evenly;

[0024] (2) Add a photoinitiator and an auxiliary agent, stir until completely dissolved, and then continue to stir at 800 r / min for 30 min to obtain the primer;

[0025] The topcoat is prepared by the following steps:

[0026] (Ⅰ) Add reactive monomers, solvent-modified acrylate, and polyurethane acrylate resin to an organic solvent, and stir at 800 r / min for 60 min to mix evenly;

[0027] (Ⅱ) Add a photoinitiator and an auxiliary agent, stir until completely dissolved, and then continue to stir at 800 r / min for 30 min to obtain the topcoat.

[0028] In a third aspect, the present invention provides the application of the above-mentioned evaporation nickel plating coating for interior and exterior decorations of new energy vehicles in the nickel plating process. Preferably, the application includes the following steps:

[0029] S1. Spray the primer on the surface of the plastic substrate, bake at 50 - 60 °C for 5 - 8 min, and then perform UV curing to form a primer film;

[0030] S2. Perform evaporation nickel plating on the primer film to form a nickel coating;

[0031] S3. Spray the topcoat on the nickel coating, bake at 50 - 60 °C for 5 - 8 min, and then perform UV curing to form a topcoat film, obtaining a nickel coating film, thereby realizing the application of the evaporation nickel plating coating for interior and exterior decorations of new energy vehicles in the nickel plating process;

[0032] The energy of the UV curing is 800 mJ / cm 2 - 1000 mJ / cm 2 ; the thickness of the primer film is 20 - 30 μm; the thickness of the topcoat film is 15 - 25 μm; the nickel coating includes a primer film, a nickel plating layer, and a topcoat film.

[0033] By using the above application steps to form a primer film, a nickel plating layer, and a topcoat film in sequence for the primer, nickel plating layer, and topcoat, a coating can be combined, which has good weather resistance, excellent adhesion to boiling water and high-temperature and high-humidity, and the coating does not fog. By separately controlling the thicknesses of the primer and topcoat, it is possible to take into account aesthetics and control costs while ensuring the improvement of weather resistance performance. In this application, plastic parts for the interior and exterior of automobiles can be used as the substrate, which can achieve the plastic metallization and lightweight of new energy vehicle parts and has extremely high application value in the field of new energy vehicles.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] The evaporation nickel plating coating for the interior and exterior of new energy vehicles provided by the present invention overcomes the problems of poor adhesion in weather resistance tests such as coating fogging, paint peeling, boiling water, and high-temperature and high-humidity that easily occur in the application of existing technology coatings. The coating provided by the present invention has a simple preparation and construction application method, can significantly improve the adhesion of the nickel plating layer to the substrate and weather resistance, avoid coating fogging, and at the same time achieve a plastic metallized appearance, taking into account both practicality and aesthetics, and has extremely high application value in the lightweight field of new energy vehicles. Specific Embodiments

[0036] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments. The test methods used in the following embodiments are all conventional methods unless otherwise specified; the materials, reagents, etc. used are reagents and materials that can be obtained from commercial channels unless otherwise specified.

[0037] In the following embodiments and comparative examples, the preparation method of the primer is:

[0038] (1) Add acrylate monomers and acrylic resins to an organic solvent, and stir at 800 r / min for 60 min to mix evenly;

[0039] (2) Add a photoinitiator and an auxiliary agent, stir until completely dissolved, and then continue to stir at 800 r / min for 30 min to obtain the primer.

[0040] In the following embodiments and comparative examples, the preparation method of the topcoat is:

[0041] (1) Add the reactive monomer, solvent-modified acrylate, and polyurethane acrylate resin to the organic solvent, and stir at 800 r / min for 60 min to mix evenly;

[0042] (2) Add the photoinitiator and additives, stir until completely dissolved, and then continue to stir at 800 r / min for 30 min to obtain the topcoat.

[0043] In the following examples and comparative examples, the method for applying the primer and topcoat of the coating to form a coating film in the evaporation nickel plating process is as follows:

[0044] (1) Wipe the plastic part (ABS / PC material) with isopropyl alcohol, and evenly spray the primer on the surface of the plastic part. The film thickness is about 25 μm;

[0045] (2) Put the plastic part sprayed with the primer into an oven at 55 °C and bake for 7 min, then cure it with a UV lamp to form a primer film. The curing energy is 1000 mJ / cm 2 ;

[0046] (4) Put the plastic part with the primer film formed into an evaporation plating machine, put nickel wire for evaporation nickel plating to form a nickel coating;

[0047] (5) Evenly spray the topcoat on the nickel plating layer. The film thickness is about 20 μm;

[0048] (6) Put the plastic part sprayed with the topcoat into an oven at 55 °C and bake for 7 min, then cure it with a UV lamp. The curing energy is 1000 mJ / cm 2 , form a topcoat film, and obtain a nickel coating film.

[0049] In the following examples and comparative examples, the method for the conventional adhesion test of the formed coating film refers to the cross-cut method in GB / T9286-1998. The results are expressed as follows: The adhesion grade of the automotive industry is 0-5 levels, with 0 being the best; the adhesion performance of 0-1 level is qualified, and 2-5 levels are unqualified.

[0050] The result of the boiling water adhesion is the result of testing the coating film adhesion of the plastic part by the cross-cut method after boiling in water at 100 °C for 2 h.

[0051] The result of the high temperature and high humidity adhesion is the result of testing the coating film adhesion of the plastic part by the cross-cut method after being treated in an environment with 90 °C heating and 96% RH humidity for 72 h.

[0052] The result of the fogging situation test is as follows: Observe the fogging situation of the nickel coating in the coating film after the plastic part is heated at 90 °C and treated in an environment with 96% RH humidity for 72 h.

[0053] In the following examples and comparative examples, the material information and sources are as follows:

[0054] (1) Solvent-based modified / special functional acrylates:

[0055] Changxing 6071: Solvent-based modified acrylate oligomer, Changxing Chemical Materials Co., Ltd.;

[0056] Changxing 6175-3: Solvent-based modified acrylate oligomer, Changxing Chemical Materials Co., Ltd.;

[0057] HU291: Special functional acrylate, Guangdong Haohui New Materials Co., Ltd.;

[0058] (2) Polyurethane acrylates, epoxy acrylates:

[0059] HE421: Standard bisphenol A epoxy acrylate resin, Guangdong Haohui New Materials Co., Ltd.;

[0060] W300: Difunctional polyurethane acrylate resin, Guangzhou Wuxing Materials Technology Co., Ltd.;

[0061] Changxing 6145-100: Hexafunctional polyurethane acrylate oligomer, Changxing Chemical Materials Co., Ltd.;

[0062] (3) Monomers:

[0063] CD9051: Methacrylated phosphate ester, Sartomer (Guangzhou) Chemical Co., Ltd.

[0064] TMPTA: Trimethylolpropane triacrylate;

[0065] DPHA: Dipentaerythritol hexaacrylate resin;

[0066] IBOA: Isobornyl acrylate;

[0067] PET3A: Pentaerythritol triacrylate;

[0068] (4) Additives (leveling agents):

[0069] TEGO2100: Polyester-modified silicone oxide (acrylated polysiloxane);

[0070] BYK333: Polyether-modified silicone oxide;

[0071] (5) Photoinitiators:

[0072] 184: 1-Hydroxycyclohexyl phenyl ketone;

[0073] 1173: 2-Hydroxy-2-methyl-1-phenyl-1-propanone;

[0074] TPO: 2,4,6-Trimethylbenzoyl-diphenylphosphine oxide;

[0075] (6) Solvent:

[0076] PMA: Propylene glycol methyl ether acetate;

[0077] Ethyl acetate;

[0078] Butyl acetate;

[0079] Isobutanol.

[0080] Other materials, reagents, etc. used in the examples can be obtained from commercial sources without special instructions.

[0081] Examples 1 - 9

[0082] Examples 1 - 9 are the examples of the nickel evaporation coating for interior and exterior trims of new energy vehicles provided by the present invention, which are respectively composed of primer 1 and topcoats 1 - 5, and primer 1 and topcoats 2 - 5;

[0083] The components of primer 1 - 5 and topcoats 1 - 5 are shown in Table 1 - 1 and Table 1 - 2.

[0084] (1) In primer 1 - 5:

[0085] Acrylic resin: Obtained by mixing difunctional polyurethane acrylate resin (W300), difunctional epoxy acrylate resin (HE421) and hexa - functional polyurethane acrylate resin (Changxing 6145 - 100) in a mass ratio of 10:13:3.

[0086] Trifunctional acrylate monomer: Obtained by mixing trimethylolpropane triacrylate (TMPTA) and pentaerythritol triacrylate (PET3A) in a mass ratio of 5:1.

[0087] Photoinitiator: Obtained by mixing 1 - hydroxycyclohexyl phenyl ketone (184), 2 - hydroxy - 2 - methyl - 1 - phenyl - 1 - propanone (1173) and 2,4,6 - trimethylbenzoyl - diphenylphosphine oxide (TPO) in a mass ratio of 3:2:0.5.

[0088] Solvent: Obtained by mixing ethyl acetate, butyl acetate, isobutanol and PMA in a mass ratio of 25:10.4:10:5.

[0089] Table 1 - 1 Component content of primer 1 - 5

[0090]

[0091] (2) Topcoats 1 - 5

[0092] In topcoats 1 - 5:

[0093] The solvent-based modified acrylate is obtained by mixing a solvent-based modified acrylate oligomer (6071) and a solvent-based modified acrylate oligomer (6175-3) in a mass ratio of 2:1.

[0094] The reactive monomers are obtained by mixing methacrylated phosphate (CD9051), dipentaerythritol hexaacrylate resin (6-functional DPHA), isobornyl acrylate (mono-functional IBOA), and pentaerythritol triacrylate (tri-functional PET3A) in the mass ratios shown in the following table.

[0095] The photoinitiator is obtained by mixing 1-hydroxycyclohexyl phenyl ketone (184) and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) in a mass ratio of 4:1.

[0096] The solvent is obtained by mixing ethyl acetate, butyl acetate, and PMA in a mass ratio of 25:11.2:5.

[0097] Moreover, the mass ratio of the hexa-functional polyurethane acrylate resin (6145-100), the mono-functional acrylate monomer (IBOA), and the tri-functional acrylate monomer (PET3A) is in the range of (2.5 - 6.4):1:1.

[0098] Table 1-2 Component contents of topcoats 1-5

[0099]

[0100]

[0101] The electroless nickel plating coatings provided in Examples 1-9 are obtained by combining the above-mentioned primer and topcoat, applied in the nickel plating process to form a coating, and the adhesion performance of the coating is tested.

[0102] The combinations of the primer and topcoat in Examples 1-9 and the performance results are shown in Table 2:

[0103] Table 2 Examples 1-9 and performance test effects

[0104]

[0105] Comparative Examples 1-11

[0106] Comparative Examples 1-11 are cases of coating combination examples where primer 6-9 is combined with the above-mentioned topcoat 1 respectively, topcoats 6-10 are combined with the above-mentioned primer 1 respectively, and coatings using primer 1 or topcoat 1 alone respectively;

[0107] The combinations of primer 6-9 and topcoats 6-10 are shown in Tables 3-1 and 3-2.

[0108] (1) In primer 6-9:

[0109] In primer 6-7, compared with primer 1, only the ratio of the acrylic resin is different;

[0110] In primers 8-9, compared with primer 1, only the total amount of the acrylic resin is different.

[0111] Primers 6-9 are shown in Table 3-1 below

[0112] Table 3-1 Components of primers 6-9

[0113]

[0114] (2) In topcoats 6-10:

[0115] In topcoats 6-7, compared with topcoat 1, only the ratios of the hexafunctional polyurethane acrylate to IBOA and PET3A are different;

[0116] In topcoats 8-9, compared with topcoat 1, only the total amount of the solvent-modified acrylate is different;

[0117] In topcoat 10, compared with topcoat 1, only the solvent-modified acrylate is replaced by a special functional acrylate.

[0118] Table 3-2 Components of topcoats 6-10

[0119]

[0120]

[0121] The coatings provided by Comparative Examples 1-11 are obtained by combining the above primers and topcoats, applied to the nickel plating process to form a coating film, and the adhesion performance of the coating film is tested.

[0122] The combinations and performance results of the primers and topcoats in Comparative Examples 1-11 are shown in Table 4:

[0123] Table 4 Comparative Examples 1-11 and performance test effects

[0124]

[0125] From the above Examples 1-9 and Comparative Examples 1-11, it can be seen that:

[0126] (1) From Examples 1-9 and Comparative Examples 3-4, it can be seen that only under the primer ratio defined in the present invention can the formed coating film have good adhesion performance, good weather resistance after conventional, boiling water and high temperature and high humidity treatments, and significantly improve the weather resistance of the coating film; from Examples 1, 3, and 5: within the range of preferably 26-30% acrylic resin and 18% acrylate monomer, the adhesion of the primer can be further improved, and paint peeling and falling off in high temperature and humid environments can be avoided.

[0127] (2) It can be seen from Examples 1-9 and Comparative Examples 7-8 that only under the paint topcoat ratio defined in the present invention can the adhesion of the paint topcoat to the coating be effectively improved, the coating be protected, and fogging after high-temperature and high-humidity treatment be reduced; within the preferred range of 30-35% of solvent-modified acrylate, the paint topcoat can better combine with the coating and the primer, and can avoid fogging of the coating film after high-temperature and high-humidity treatment.

[0128] (3) It can be seen from Example 1 and Comparative Examples 1-2 that only when the mass ratio of the difunctional polyurethane acrylate resin, difunctional epoxy acrylate resin, and hexafunctional polyurethane acrylate resin in the primer is 10:13:3 can the adhesion of the primer to the substrate and the plating property be ensured, and the adhesion performance of the coating film after boiling water and high-temperature and high-humidity treatment be improved; changing this ratio will result in a significant decrease in adhesion.

[0129] (4) It can be seen from Example 1 and Comparative Examples 5-6 that only when the mass ratio of the hexafunctional polyurethane acrylate resin, monofunctional acrylate monomer, and trifunctional acrylate monomer in the paint topcoat is (2.5-6.4):1:1 can the performance of the paint topcoat be better adjusted while ensuring the adhesion of the paint topcoat, preventing brittleness and paint chipping at room temperature, and preventing the reduction of weather resistance under high temperature and high humidity and reducing fogging.

[0130] (5) It can be seen from Example 1 and Comparative Examples 9-10 that the combination of the primer and the paint topcoat in the present invention is essential. Without the primer, the nickel coating cannot achieve adhesion; without the paint topcoat, the nickel coating is exposed to the environment, has poor weather resistance, and is extremely easy to be oxidized and damaged.

[0131] (6) It can be seen from Example 1 and Comparative Example 11 that using the solvent-modified acrylate with the defined dosage in the paint topcoat can significantly improve the performance of the formed coating film and effectively prevent the coating from fogging; replacing it with other special-functional acrylates will significantly reduce the high-temperature and high-humidity resistance performance, and the coating will severely fog under high-temperature and high-humidity environment, affecting the appearance and user experience.

[0132] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A nickel electroplating coating for interior and exterior trim of new energy vehicles, characterized in that, The coating includes a primer and a topcoat; By mass percentage, the primer includes the following components: 25-35% acrylic resin, 15-20% trifunctional acrylate monomer, 3-8% photoinitiator, and the balance is solvent; the acrylic resin is a mixture of difunctional polyurethane acrylate resin, difunctional epoxy acrylate resin, and hexafunctional polyurethane acrylate resin; By mass percentage, the topcoat includes the following components: 20-35% solvent-modified acrylate, 8-15% hexafunctional polyurethane acrylate resin, 5-15% reactive monomer, 2-5% photoinitiator, and the balance is solvent; the reactive monomer is a mixture of monofunctional acrylate monomer, trifunctional acrylate monomer, hexafunctional acrylate monomer, and phosphate monomer; In the topcoat, the mass ratio of hexafunctional polyurethane acrylate resin, monofunctional acrylate monomer, and trifunctional acrylate monomer is hexafunctional polyurethane acrylate resin: monofunctional acrylate monomer: trifunctional acrylate monomer = (2.5-6.4):1:

1.

2. The nickel electroplating paint for interior and exterior trim of new energy vehicles according to claim 1, wherein The primer also includes an additive.

3. The electroless nickel plating coating for interior and exterior trim of new energy vehicles according to claim 2, wherein By mass percentage, the primer includes the following components: 26-30% acrylic resin, 18% trifunctional acrylate monomer, 5.5% photoinitiator, 0.1-0.3% additive, and the balance is solvent.

4. The nickel evaporation coating for interior and exterior trim of new energy vehicles according to claim 1, characterized in that, In the primer, the difunctional epoxy acrylate resin is bisphenol A epoxy acrylate resin, and the trifunctional acrylate monomer is a mixture of trimethylolpropane triacrylate and pentaerythritol triacrylate.

5. The electroless nickel plating coating for interior and exterior trim of new energy vehicles according to claim 4, characterized in that, In the primer, the mass ratio of difunctional polyurethane acrylate resin, difunctional epoxy acrylate resin, and hexafunctional polyurethane acrylate resin is difunctional polyurethane acrylate resin: difunctional epoxy acrylate resin: hexafunctional polyurethane acrylate resin = 10:13:

3.

6. The electroless nickel plating coating for interior and exterior trim of new energy vehicles according to claim 1, wherein The topcoat also includes an additive.

7. The electroless nickel plating coating for interior and exterior trim of new energy vehicles according to claim 6, wherein By mass percentage, the topcoat includes the following components: 30-35% solvent-modified acrylate, 8-15% hexafunctional polyurethane acrylate resin, 12-15% reactive monomer, 2.5% photoinitiator, 0.1-0.3% additive, and the balance is solvent.

8. The nickel electroplating evaporation coating applied to the interior and exterior decorations of new energy vehicles according to claim 1, wherein In the topcoat, the reactive monomer is a mixture of methacrylated phosphate, dipentaerythritol hexaacrylate, isobornyl acrylate, and pentaerythritol triacrylate.

9. The electroless nickel plating coating for interior and exterior trim of new energy vehicles according to claim 2 or 6, characterized in that, The primer is prepared by the following steps: (1) Add the trifunctional acrylate monomer and acrylic resin to an organic solvent, and stir at 800 r / min for 60 min to mix evenly; (2) Add the photoinitiator and additive, stir until completely dissolved, and then continue to stir at 800 r / min for 30 min to obtain the primer; The topcoat is prepared by the following steps: (Ⅰ) Add the reactive monomer, solvent-modified acrylate, and hexafunctional polyurethane acrylate resin to an organic solvent, and stir at 800 r / min for 60 min to mix evenly; (Ⅱ) Add the photoinitiator and additive, stir until completely dissolved, and then continue to stir at 800 r / min for 30 min to obtain the topcoat.

10. Application of the evaporated nickel plating coating for interior and exterior trim of new energy vehicles in the nickel plating process according to any one of claims 1-9.

11. The application of the nickel evaporation coating for interior and exterior trim of new energy vehicles in the nickel plating process according to claim 10, characterized in that, The application includes the following steps: S1. Spray the primer on the surface of the plastic substrate, bake at 50-60 °C for 5-8 minutes, and then perform UV curing to form a primer film; S2. Perform evaporated nickel plating on the primer film to form a nickel coating; S3. Spray the topcoat on the nickel coating, bake at 50-60 °C for 5-8 minutes, and then perform UV curing to form a topcoat film, obtaining a nickel coating film, realizing the application of the evaporated nickel plating coating for interior and exterior trim of new energy vehicles in the nickel plating process; The energy of the UV curing is 800 mJ / cm 2 -1000 mJ / cm 2 ; the thickness of the primer paint film is 20 - 30 μm; the thickness of the topcoat paint film is 15 - 25 μm; the nickel coating includes a primer paint film, a nickel plating layer, and a topcoat paint film.

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