Vacuum coating paint and application thereof

Abstract

The invention discloses vacuum coating paint and application thereof, and belongs to the technical field of paint. The vacuum coating paint comprises the following components in percentage by mass: 5-10% of epoxy acrylic resin; 25%-35% of solvent type modified acrylic resin; 5%-12% of polyurethane acrylic resin; 9%-15% of an acrylate monomer; 2%-5% of a photoinitiator; 0.5%-2% of a leveling agent; 0.2%-0.5% of an adhesion promoter; and 30%-50% of an organic solvent. The paint can form a finish paint coating with an intermediate paint effect, so that an existing three-coating process for vacuum coating paint is improved into a two-coating process, the preparation process of the coating is simplified, the cost is reduced, and the technical problems existing in related technologies are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and particularly relates to a vacuum coating paint and its application. Background Art

[0002] In order to present a metallic texture effect on plastic parts, physical vapor deposition (PVD), non-conductive vacuum metalization (NCVM), etc. are usually used to deposit a metal coating on plastic parts. In order to adapt to the above vacuum coating process, a paint layer needs to be formed on the plastic parts of the vacuum coating paint to cooperate with the metal coating to meet the coating color and performance requirements of plastic products.

[0003] Some vacuum coating paints related to the related art require a three-coating process to form a primer, an intermediate paint, and a topcoat to cooperate with the metal coating to achieve the desired effect. Among them, the primer is formed on the surface of the plastic part, the metal coating is formed on the surface of the primer, the intermediate paint is formed on the surface of the metal coating, and the topcoat is formed on the surface of the intermediate paint. The primer is used to enhance the adhesion between the plastic part and the metal coating. Specific color nano-pigments are added to the intermediate paint to enhance the metallic texture and present a colorful effect. The topcoat is used to provide sufficient hardness, high and low temperature resistance, water resistance and other properties.

[0004] However, the three-coating process not only makes the coating preparation process flow complex, but also increases the cost. Summary of the Invention

[0005] In view of this, the present invention provides a vacuum coating paint and its application, which can solve the technical problems existing in the related art. Specifically, the following technical solutions are included:

[0006] On the one hand, a vacuum coating paint is provided. The vacuum coating paint comprises the following components in mass percentage:

[0007] Epoxy acrylate resin: 5% - 10%;

[0008] Solvent-based modified acrylate resin: 25% - 35%;

[0009] Polyurethane acrylate resin: 5% - 12%;

[0010] Acrylate monomers: 9% - 15%;

[0011] Photoinitiator: 2% - 5%;

[0012] Leveling agent: 0.5% - 2%;

[0013] Adhesion promoter: 0.2% - 0.5%;

[0014] 30% - 50% of organic solvent.

[0015] In some possible implementation manners, the epoxy acrylate resin is a fatty acid-modified bisphenol A epoxy acrylate, and the fatty acid-modified bisphenol A epoxy acrylate satisfies at least one of the following viscosity conditions: the viscosity at 25°C is 6000 cps - 30000 cps, and the viscosity at 60°C is 1050 - 1450 cps.

[0016] In some possible implementation manners, the polyurethane acrylate resin is a six-functional polyurethane acrylate resin; the viscosity of the six-functional polyurethane acrylate resin at 60°C is 1200 cps - 5000 cps.

[0017] In some possible implementation manners, the mass ratio of the solvent-based modified acrylate resin to the six-functional polyurethane acrylate resin is 2 - 4:1.

[0018] In some possible implementation manners, the acrylate monomer is selected from at least one of isobornyl acrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, and 1,6-hexanediol diacrylate.

[0019] In some possible implementation manners, the acrylate monomer includes trimethylolpropane triacrylate and pentaerythritol triacrylate, and the mass ratio of the trimethylolpropane triacrylate to the pentaerythritol triacrylate is 3 - 5:5 - 8.

[0020] In some possible implementation manners, the photoinitiator is selected from at least one of photoinitiator 1173, photoinitiator 184, photoinitiator TPO, and photoinitiator TMO.

[0021] In some possible implementation manners, the coating further includes 0.1% - 1% of nano-color paste by mass percentage.

[0022] On the other hand, an application of the vacuum coating paint described above in the plastic part vacuum coating process is provided.

[0023] On yet another hand, a coated plastic part is provided, which includes: a plastic substrate, a primer formed on the surface of the plastic substrate, a metal coating plated on the surface of the primer, and a topcoat formed on the surface of the metal coating, wherein the topcoat is prepared from the vacuum coating paint described above.

[0024] The beneficial effects of the technical solution provided by the embodiments of the present invention at least include:

[0025] The vacuum coating paint provided by the embodiment of the present invention uses a certain proportion of epoxy acrylate resin, solvent-modified acrylate resin, polyurethane acrylate resin, acrylate monomer, photoinitiator, leveling agent, and adhesion promoter to work together, so that the vacuum coating paint not only has good color development to meet the color design requirements, but also has good hardness, high and low temperature resistance, water resistance and other properties. Therefore, the vacuum coating paint can not only be used as a topcoat paint, but also has the function of an intermediate coat paint, enabling it to form a topcoat coating with the effect of an intermediate coat during application, thus improving the three-coat process for vacuum coating paint to a two-coat process, simplifying the coating preparation process, reducing costs, and effectively solving the technical problems existing in the related technology. Detailed implementation manners

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Aiming at the problems of complex coating preparation process and increased cost caused by the need for three-coat operations of the current vacuum coating paint to meet the requirements of the coating color and performance of plastic products, the embodiment of the present invention provides a new type of vacuum coating paint, which includes the following components in mass percentage: epoxy acrylate resin 5% - 10%; solvent-modified acrylate resin 25% - 35%; polyurethane acrylate resin 5% - 12%; acrylate monomer 9% - 15%; photoinitiator 2% - 5%; leveling agent 0.5% - 2%; adhesion promoter 0.2% - 0.5%; organic solvent 30% - 50%.

[0028] Exemplarily, some examples of the mass percentage of epoxy acrylate resin in the paint can be any one of the following values or the value range composed of any two of them: 5%, 6%, 7%, 8%, 9%, 10%, etc.

[0029] Some examples of the mass percentage of solvent-modified acrylate resin in the paint can be any one of the following values or the value range composed of any two of them: 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, etc.

[0030] Some examples of the mass percentage of polyurethane acrylate resin in the paint can be any one of the following values or the value range composed of any two of them: 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, etc.

[0031] Some examples of the mass percentage of acrylate monomers in the coating can be any one of the following values or the range of values composed of any two of them: 9%, 10%, 11%, 12%, 13%, 14%, 15%, etc.

[0032] Some examples of the mass percentage of photoinitiator in the coating can be any one of the following values or the range of values composed of any two of them: 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, etc.

[0033] Some examples of the mass percentage of leveling agent in the coating can be any one of the following values or the range of values composed of any two of them: 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, etc.

[0034] Some examples of the mass percentage of adhesion promoter in the coating can be any one of the following values or the range of values composed of any two of them: 0.2%, 0.25%, 0.3%, 0.35%, 0.4%, 0.45%, 0.5%, etc.

[0035] The vacuum coating paint provided by the embodiments of the present invention uses a certain ratio of epoxy acrylate resin, solvent-modified acrylate resin, polyurethane acrylate resin, acrylate monomers, photoinitiator, leveling agent, and adhesion promoter to act synergistically, so that the vacuum coating paint not only has good color development to meet the color design requirements, but also has good hardness, high and low temperature resistance, water resistance and other properties. Therefore, the vacuum coating paint can not only be used as a topcoat paint, but also has the function of an intermediate coat paint, enabling it to form a topcoat with the effect of an intermediate coat during application, thereby improving the three-coat process for vacuum coating paint to a two-coat process, simplifying the coating preparation process, reducing costs, and effectively solving the technical problems existing in the related art.

[0036] The following respectively gives an exemplary description of the functions of each component in the vacuum coating paint.

[0037] For the epoxy acrylic resin, in some examples, the epoxy acrylic resin is fatty acid-modified bisphenol A epoxy acrylate, and the fatty acid-modified bisphenol A epoxy acrylate satisfies at least one of the following viscosity conditions: a viscosity of 6000 cps to 30000 cps at 25° C., and a viscosity of 1050 to 1450 cps at 60° C. For example, the fatty acid-modified bisphenol A epoxy acrylate can at least satisfy a viscosity of 6000 cps to 30000 cps at 25° C., and further, the fatty acid-modified bisphenol A epoxy acrylate can further satisfy a viscosity of 1050 to 1450 cps at 60° C.

[0038] The fatty acid-modified bisphenol A epoxy acrylate having the above-mentioned viscosity conditions not only has excellent leveling and pigment wetting properties so as to provide different color design requirements for the paint film, but also has excellent hardness, flexibility, chemical resistance and abrasion resistance.

[0039] Examples of commercially available products of some fatty acid-modified bisphenol A epoxy acrylates include: 3415, At least one of 3700. For example, 3415, the viscosity of which at 60°C is 1050-1450cps, in order to optimize the above-mentioned effects.

[0040] In particular, the study found that when the mass percentage of epoxy acrylate resin, especially fatty acid-modified bisphenol A epoxy acrylate in the coating is 5% to 10%, it can not only show better pigment wettability, flexibility and high gloss, but also will not affect the performance requirements such as leveling fullness and high-temperature boiling.

[0041] In some examples, when epoxy acrylate is used When the mass percentage is 3415, it can be 6% to 8%, for example, 7%, to achieve better effect.

[0042] The solvent-based modified acrylic resin may be a solvent-based polyurethane acrylic resin. Examples of some commercially available products include a solvent-based polyurethane acrylic resin with a model number of 60711 produced by Changxing Chemical and a solvent-based acrylic resin with a model number of 7206 produced by DIC.

[0043] For the polyurethane acrylic resin, in some examples, the polyurethane acrylic resin is a hexafunctional polyurethane acrylic resin, and the viscosity of the hexafunctional polyurethane acrylic resin at 60° C. is 1200 cps to 5000 cps, and further can be 1400 cps to 4200 cps.

[0044] The hexa-functional polyurethane acrylate resin that meets the above viscosity conditions has the advantages of high curing rate, ultra-wear resistance, high hardness, good pigment wettability, etc.

[0045] Examples of commercially available products of the hexa-functional polyurethane acrylate resin can be the hexa-functional aliphatic polyurethane acrylate resins with the models HP6310 and HP6610 from Guangdong Haohui New Materials Co., Ltd.

[0046] Through a large number of experiments and explorations in the embodiments of the present invention, it is found that the combined use of solvent-based modified acrylate resin and hexa-functional polyurethane acrylate resin is beneficial to achieving good compatibility among the components in the coating system, improving the stability of the coating system, significantly improving the dryness of the coating caused by the coating, and the adhesion to the metal coating, etc.

[0047] In some examples, a solvent-based acrylate resin with the model 7206 from DIC Daisheng can be combined with a hexa-functional aliphatic polyurethane acrylate resin with the model HP6310 from Guangdong Haohui New Materials Co., Ltd. (whose viscosity at 60°C is 1400 cps to 4200 cps) to further optimize the above effects.

[0048] Furthermore, the mass ratio of the solvent-based modified acrylate resin to the hexa-functional polyurethane acrylate resin can be 2 to 4:1, for example, it can be 3 to 3.5:1, and further can be 3.2:1, so that the coating caused by the coating has excellent dryness, weather resistance and adhesion, appropriate hardness and softness, and the coating is plump and has good appearance.

[0049] For acrylate monomers, in some examples, the acrylate monomers are selected from at least one of isobornyl acrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, 1,6-hexanediol diacrylate, etc., so as to play an excellent active dilution role.

[0050] Further for example, the acrylate monomers include trimethylolpropane triacrylate and pentaerythritol triacrylate, and the mass ratio of trimethylolpropane triacrylate to pentaerythritol triacrylate is 3 to 5:5 to 8. For example, the mass ratio of the two can be 4:7.

[0051] It is found that for the coating system involved in the embodiments of the present invention, the combination of trimethylolpropane triacrylate and pentaerythritol triacrylate with a mass ratio of (3 - 5):(5 - 8) as the active diluent monomer can maximize the synergistic effect between the two, so that the solvent-based acrylate resin, polyurethane acrylate resin and epoxy acrylate resin in the coating system are dissolved and dispersed, effectively improving the reaction activity, and improving the coloring property, wear resistance, weather resistance, and adhesion to the substrate of the coating caused by the coating, etc.

[0052] For photoinitiators, in some examples, the photoinitiator is selected from at least one of photoinitiator 1173, photoinitiator 184, photoinitiator TPO, and photoinitiator TMO, so as to obtain a better polymerization initiation effect.

[0053] Furthermore, the photoinitiator can be a combination of photoinitiator 184 and photoinitiator TMO (a proprietary product of Fibro Chemical Co., Ltd.), and the mass ratio of photoinitiator 184 to photoinitiator TMO is (1-2):(2-4). Preferably, the mass ratio of photoinitiator 184 to photoinitiator TMO is 1.2:2.8, which helps to ensure that the curing efficiency of the coating system does not cause fogging problems and does not make the paint film too hard to affect adhesion.

[0054] In the embodiments of the present disclosure, some leveling agents suitable for the above coating system are selected from at least one of BYK306, BYK333, and AFKA3777. Further, BYK306 is selected as the leveling agent. It is an organosilicon surface additive that can more effectively reduce the surface tension to promote the leveling of the coating.

[0055] In the embodiments of the present disclosure, some adhesion promoters suitable for the above coating system are selected from at least one of the adhesion promoter SR9051 of Sartomer Chemical Co., Ltd. and the phosphate ester adhesion promoter H951 of Dongguan Yitu New Materials Co., Ltd. For example, the adhesion promoter SR9051 can be used to improve the adhesion between the coating and the metal plating.

[0056] In the embodiments of the present disclosure, some organic solvents suitable for the above coating system include at least one of aromatic hydrocarbons, short-chain organic alcohols, ether compounds, ketone compounds, and ester compounds. As an example, the organic solvent includes at least one of ester compounds and ketone compounds.

[0057] In some examples, the organic solvent simultaneously includes butyl acetate, ethyl acetate, propylene glycol methyl ether acetate, and methyl isobutyl ketone, and the mass ratio of butyl acetate, ethyl acetate, propylene glycol methyl ether acetate, and methyl isobutyl ketone is 1:0.5-2:3-5:1-3, and further can be 1:1:4:2.

[0058] In some embodiments, the vacuum coating paint provided by the embodiments of the present disclosure further includes 0.1%-1% by mass of nano-color paste. According to the actual color requirements, nano-color paste of a suitable color is selected. For example, in order to match the nickel metal plating, black nano-color paste can be used to enhance the texture of the nickel metal.

[0059] Some examples of the mass percentage of the nano-color paste in the coating can be any one of the following values or the value range composed of any two of the following values: 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, etc.

[0060] For any one of the above-mentioned vacuum coating paints, it can be prepared by the following method:

[0061] (1) Add epoxy acrylate resin, solvent-modified acrylate resin and polyurethane acrylate resin into a container and stir evenly.

[0062] (2) Continue to add acrylate monomers and a part of organic solvents (for example, 1 / 3 volume) into the container and stir evenly. For example, stir at a speed of 800 revolutions per minute.

[0063] (3) Dissolve the photoinitiator in another container with another part of organic solvents (for example, 1 / 3 volume). Under stirring conditions, add the dissolved mixture into the container in step (2).

[0064] (4) Continue to add a leveling agent and an adhesion promoter into the container in (2) and stir evenly. For example, stir at a speed of 800 revolutions per minute for 15 to 20 minutes.

[0065] (5) Continue to add the remaining solvents into the container in step (4) to adjust the viscosity (for example, 8.5 - 12 s, Iwata No. 2 cup, 25 °C), and then filter with a 400-mesh filter cloth for standby.

[0066] On the other hand, the embodiments of the present invention also provide the application of any one of the above-mentioned vacuum coating paints in the vacuum coating process of plastic parts.

[0067] An example of a vacuum coating process for plastic parts can be as follows: Adopt processes such as spraying, brushing, and roller coating to coat a primer paint on the plastic parts. After UV curing, a primer attached to the plastic parts is obtained. Adopt a vacuum coating process to deposit a metal coating, such as a nickel metal coating, on the surface of the primer to present a certain metallic texture. Further, adopt processes such as spraying, brushing, and roller coating to coat a topcoat paint on the surface of the metal coating by using the vacuum coating paint provided by the embodiments of the present invention. After UV curing, a topcoat attached to the metal coating is obtained. Thus, multiple layers of coatings are formed on the plastic parts, which not only endow the plastic parts with excellent metallic texture but also have excellent high and low temperature resistance, water resistance, hardness, wear resistance, adhesion, etc., and can at least meet the automotive interior coating test standards.

[0068] In another aspect, an embodiment of the present invention further provides a coated plastic part, which includes: a plastic substrate, a primer formed on the surface of the plastic substrate, a metal coating plated on the surface of the primer, and a topcoat formed on the surface of the metal coating. Among them, the topcoat is prepared by using any one of the above-mentioned vacuum coating paints.

[0069] The coated plastic part provided by the embodiment of the present invention has all the advantages of the above-mentioned vacuum coating paint, so that the plastic part not only has excellent metallic texture, but also has excellent high and low temperature resistance, water resistance, hardness, wear resistance, adhesion and other effects, and can at least meet the automotive interior coating test standards.

[0070] As described above, by using processes such as spraying, brushing, and rolling, a primer coating is applied to the plastic part, and after UV curing, a primer attached to the plastic part is obtained. By using a vacuum coating process, a metal coating, such as a nickel metal coating, is plated on the surface of the primer to present a certain metallic texture. Further, by using processes such as spraying, brushing, and rolling, the vacuum coating paint provided by the embodiment of the present invention is used to apply a topcoat coating on the surface of the metal coating, and after UV curing, a topcoat attached to the metal coating is obtained.

[0071] An exemplary preparation process of the topcoat can be as follows: By using processes such as spraying, brushing, and rolling (taking spraying as an example, spraying with 0.3 - 0.5 Mpa compressed air, and the spray gun orifice diameter is 1 mm - 1.5 mm), a coating liquid film is formed on the surface of the metal coating. After leveling and preheating for 10 min - 15 min, UV curing is carried out, and the curing energy is 800 mj / cm 3 ~1000 mj / cm 3 to form a topcoat.

[0072] The exemplary embodiments of the present invention will be described in more detail below. Although the exemplary embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. For those without specific technical or conditions noted in the examples, they shall be carried out according to the techniques or conditions described in the literature in the art or according to the product specifications. For the reagents or instruments without the manufacturer noted, they are all conventional products that can be obtained through commercial purchase.

[0073] Examples 1 - 6 respectively provide a vacuum coating paint, and its formula can be seen in Table 1 below. Among them, the values involved in Table 1 all represent the mass percentages of each component. Comparative Examples 1 - 9 respectively provide comparative coating paints, and their formulas can be seen in Table 3 below. Among them, the values involved in Table 3 all represent the mass percentages of each component.

[0074] For Examples 1 - 6 and Comparative Examples 1 - 9, the raw material information of each component is as follows:

[0075] (1) Epoxy acrylic resin: Allnex 3415, purchased from Shanghai Kain Chemical Co., Ltd.; thermoplastic acrylic resin: KN1095, purchased from Guangdong Kelisen Resin Co., Ltd.

[0076] (2) The solvent-based modified acrylic resin was DIC 7206, purchased from Jingyi New Materials Co., Ltd.

[0077] (3) Hexafunctional polyurethane acrylic resin was Haohui HP6310, purchased from Guangdong Haohui New Materials Co., Ltd.

[0078] (4) Acrylate monomers include trimethylolpropane triacrylate (TMPTA) and pentaerythritol triacrylate (Changxing EM235).

[0079] (5) The photoinitiators include: photoinitiator 184, photoinitiator TPO, and photoinitiator TMO; the leveling agent is BYK306 (polyether modified polydimethylsiloxane solution); and the adhesion promoter is SR9051, which was purchased from Shanghai Sendi Chemical Co., Ltd.

[0080] (6) Solvents include: ethyl acetate, butyl acetate, propylene glycol methyl ether acetate (PMA), and methyl isobutyl ketone.

[0081] (7) The nano color paste is DWB-Z 662ABLUE produced by Nagase.

[0082] In Examples 1 to 6, the preparation process of each coating is as follows:

[0083] (1) Add epoxy acrylic resin, solvent-based modified acrylic resin and polyurethane acrylic resin into a container and stir evenly.

[0084] (2) Continue to add acrylic acid ester monomers and 1 / 3 volume of organic solvent into the container, and stir evenly, for example, by rotating and stirring at a speed of 800 rpm.

[0085] (3) Dissolve the photoinitiator in another container using 1 / 3 volume of an organic solvent, and add the dissolved mixture into the container of step (2) under stirring.

[0086] (4) Continue to add the leveling agent and adhesion promoter to the container of (2), and stir at 800 rpm for 15 to 20 minutes until the mixture is evenly mixed.

[0087] (5) Continue to add the remaining solvent to the container of step (4), adjust the viscosity (8.5-12s, Iwata No. 2 cup, 25°C), filter with a 400-mesh filter cloth, and set aside.

[0088] For Examples 1 - 6 and Comparative Examples 1 - 9 of each coating, each coating was applied to a sample to form a topcoat layer, where the sample had been plated with a nickel metal coating, and the coating was applied onto the nickel metal coating. The preparation process is as follows: After adding color paste to the coating according to the color mixing requirements, it was sprayed using 0.3 - 0.5 Mpa compressed air, with a spray gun orifice diameter of 1 - 1.5 mm. After spraying, it was leveled and preheated at a low temperature (50°C ± 10°C) for 15 min and then UV cured, with a curing energy of 900 mj / cm 3 , and after curing, the film thickness of the topcoat layer was 20 um - 25 um. The appearance of the topcoat layer was observed and its performance was tested.

[0089] The following properties of the topcoat layers corresponding to Examples 1 - 6 were tested. The following tests were carried out in accordance with the common tests for automotive interior vacuum coated parts, and the test methods are as follows. The test results are listed in Table 2. The same tests were also applied to the topcoat layers corresponding to Comparative Examples 1 - 9, and the test results are listed in Table 4.

[0090] (a) Adhesion: A grid test was carried out in accordance with the DIN EN ISO2409 test standard, and the tape: TESA4657a. Among them, when the adhesion was grade 0, the adhesion was the best, with its cutting edges being completely smooth and none of the grids peeling off. By analogy, when the adhesion was grade 5, the adhesion was the worst, with the entire coating peeling off.

[0091] (b) Boiling water test: After being placed in boiling water at 100°C for 4 h, the adhesion of the topcoat layer was tested in accordance with the above DIN EN ISO2409 test standard.

[0092] (c) Hydrolysis resistance (high temperature and high humidity resistance): The sample to be tested was stored in a climate test chamber at 90 ± 2°C and a humidity of 95 ± 3% for 72 h. After the test was completed, its color fastness grade was tested in accordance with the DIN EN 20105 - A02 standard. When the color fastness ≥ 4, it indicated that there was no visible difference in the color of the paint film before and after the test, and there was no color fading or color blooming phenomenon. Then, its appearance was visually inspected for any abnormalities, such as bubbles, cracks, etc. Then, in accordance with the DIN ENISO2409 test standard, the adhesion of the topcoat layer was tested. Among them, color blooming is the phenomenon of the coating showing a colored halo. The coating will show this color blooming appearance after incomplete reaction or after eroding the coating in a high temperature and high humidity environment.

[0093] (d) Resistance to RCA test (i.e., tape friction test): Abrasion resistance was tested on a paper bag abrasion tester according to the standard to observe whether the topcoat layer was worn through.

[0094] Table 1

[0095]

[0096] Table 2

[0097]

[0098]

[0099] Table 3

[0100]

[0101] Table 4

[0102]

[0103] Combining Table 1 and Table 3, it can be seen that compared with Example 1, the total amount of modified epoxy resin is different in Comparative Examples 1-2. Compared with Example 1, in Comparative Example 3, the modified epoxy resin is replaced with a thermoplastic acrylic resin. Compared with Example 1, the ratio of solvent-based modified acrylic acid to hexafunctional polyurethane is different in Comparative Examples 4-7. Compared with Example 1, the ratio of monomer trimethylolpropane triacrylate and pentaerythritol triacrylate is different in Comparative Examples 8-9.

[0104] Combining the data in Table 2 and Table 4, at least the following conclusions can be drawn:

[0105] (1) The coatings formed by the coatings provided in Examples 1-6 have good high-temperature and high-humidity resistance, good compatibility and color development with pigments, and good wear resistance.

[0106] (2) According to the relevant data of Examples 1-6 and Comparative Examples 4-7, it is confirmed that when the mass ratio of solvent-based acrylic resin to hexafunctional polyurethane is 2-4:1, a topcoat with good adhesion can be formed on the nickel plating layer of metal, and moreover, this coating also has high-temperature and high-humidity resistance and excellent wear resistance. When the mass percentage of the preferred solvent-based acrylic resin is controlled within the range of 25%-35% and the mass percentage of hexafunctional aliphatic polyurethane acrylate is controlled within the range of 5%-12%, the adhesion between the topcoat and the nickel plating layer of metal is excellent enough to provide good wear resistance and avoid peeling or coloration after high temperature and high humidity.

[0107] (3) According to the relevant data of Examples 1-6 and Comparative Examples 1-3, it can be seen that compared with thermoplastic acrylic resin, epoxy-modified resin can improve the color spot problem of the topcoat, and when the mass percentage of epoxy resin is 5%-10%, while ensuring the color development of the topcoat, it can also ensure the hardness and high-temperature and high-humidity resistance.

[0108] (4) According to the relevant data of Example 1 and Comparative Examples 8-9, when the total mass percentage of trimethylolpropane triacrylate and pentaerythritol triacrylate is 9%-15%, and the mass ratio of trimethylolpropane triacrylate to pentaerythritol triacrylate satisfies (3-5):(5-8), the two can exert their synergistic effect to the greatest extent, improve the reaction activity, while ensuring the adhesion of the topcoat, it is also beneficial to adjust the hardness and high temperature and high humidity resistance, prevent cracking and peeling in the crosshatch test, and reduce paint loss and color bleeding after high temperature and high humidity.

[0109] In summary, the vacuum coating paint provided by the embodiments of the present invention can pass a series of basic tests of common automotive interior parts such as adhesion, RCA wear resistance, boiling water resistance, and hydrolysis resistance, and has excellent mechanical properties, enabling it to be suitable for automotive interior coating. Moreover, based on the good adhesion and color development properties of these vacuum coating paints on the metal coating, the process of vacuum coating intermediate paint can be replaced, simplifying the coating preparation process and reducing costs.

[0110] The above description is only for the convenience of those skilled in the art to understand the technical solution of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vacuum coating paint, characterized in that, The vacuum coating paint comprises the following components in mass percentages:

2. The vacuum coating paint according to claim 1, wherein, The epoxy acrylate resin is a fatty acid-modified bisphenol A epoxy acrylate, and the fatty acid-modified bisphenol A epoxy acrylate satisfies at least one of the following viscosity conditions: the viscosity at 25°C is 6000 cps to 30000 cps, and the viscosity at 60°C is 1050 to 1450 cps.

3. The vacuum coating paint according to claim 1, wherein The polyurethane acrylate resin is a hexa-functional polyurethane acrylate resin; The viscosity of the hexa-functional polyurethane acrylate resin at 60°C is 1200 cps to 5000 cps.

4. The vacuum coating paint according to claim 3, characterized in that, The mass ratio of the solvent-based modified acrylate resin to the hexa-functional polyurethane acrylate resin is 2 to 4:

1.

5. The vacuum coating paint according to claim 1, characterized in that, The acrylate monomer is selected from at least one of isobornyl acrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, and 1,6-hexanediol diacrylate.

6. The vacuum coating paint according to claim 5, characterized in that, The acrylate monomer includes trimethylolpropane triacrylate and pentaerythritol triacrylate, and the mass ratio of the trimethylolpropane triacrylate to the pentaerythritol triacrylate is 3 to 5:5 to 8.

7. The vacuum coating paint according to claim 1, wherein The photoinitiator is selected from at least one of photoinitiator 1173, photoinitiator 184, photoinitiator TPO, and photoinitiator TMO.

8. The vacuum coating paint according to any one of claims 1-7, characterized in that, The paint further comprises 0.1%-1% of nano-color paste by mass percentage.

9. Application of the vacuum coating paint according to any one of claims 1-8 in the plastic part vacuum coating process.

10. A coated plastic part, characterized in that, The coated plastic part comprises: a plastic substrate, a primer formed on the surface of the plastic substrate, a metal coating plated on the surface of the primer, and a topcoat formed on the surface of the metal coating, wherein the topcoat is prepared by using the vacuum coating paint according to any one of claims 1-8.

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