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 parts of acrylic polyol resin; 18 parts to 25 parts of low-functionality polyurethane acrylic resin; 8 to 10 parts of high-functionality polyurethane acrylic resin; 10 to 15 parts of a reactive diluent; 2 to 5 parts of a photoinitiator; 0.4 to 1 part of an auxiliary agent; and 40-60 parts of an organic solvent. The paint can form a finish paint coating with an intermediate paint effect, the finish paint coating does not have a floating phenomenon, a current three-coating process for vacuum coating paint is improved into a two-coating process, the preparation process of the coating is simplified, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and particularly 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 the plastic parts. In order to adapt to the above-mentioned 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 technology need to undergo 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. A nano-color paste with a specific color is added to the intermediate paint to enhance the metallic texture and produce a colorful effect. The topcoat is used to provide sufficient hardness, high and low temperature resistance, water resistance and other properties.

[0004] However, although the arrangement of the intermediate paint is beneficial for the addition of the nano-color paste, it is likely to affect other properties of the product. Moreover, the three-coating process not only makes the coating preparation process flow complex but also increases the cost. If the intermediate paint is simply cancelled, there is an obvious problem of color mottling in the currently disclosed topcoat, especially after adding the nano-color paste, the color mottling problem is more obvious. 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 technology. 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 parts by weight:

[0007]

[0008]

[0009] In some possible implementation manners, the acrylic polyol resin satisfies at least one of the following physical property parameters: hydroxyl value of 50-58, acid value of 3.0-5.0, and glass transition temperature of 70°C to 80°C.

[0010] In some possible implementation manners, the functionality of the low functionality polyurethane acrylate resin is 3 - 4; the low functionality polyurethane acrylate resin satisfies at least one of the following physical property parameters: viscosity of 4800 cps to 6800 cps, acid value of 3.5 - 5.5.

[0011] In some possible implementation manners, the high functionality polyurethane acrylate resin is a hexa - functionality polyurethane acrylate resin; the viscosity of the hexa - functionality polyurethane acrylate resin is 60000 cps to 90000 cps.

[0012] In some possible implementation manners, the active diluent is selected from at least one of HEMA, IBOA, HDDA, TMPTA, DPHA, and PET3A.

[0013] In some possible implementation manners, the active diluent includes 5 parts - 8 parts of HEMA and 5 parts - 8 parts of PET3A.

[0014] In some possible implementation manners, the additives include an organosilicon leveling agent and a phosphate ester additive. The weight parts of the organosilicon leveling agent are 0.2 parts to 0.5 parts, and the weight parts of the phosphate ester additive are 0.2 parts to 0.5 parts.

[0015] In some possible implementation manners, the photoinitiator is selected from at least one of photoinitiator TPO, photoinitiator 184, and photoinitiator TMO.

[0016] On the other hand, provided is the application of the vacuum coating paint described in any one of the above in the plastic part vacuum coating process.

[0017] On yet another hand, provided is 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 the vacuum coating paint described in any one of the above.

[0018] The beneficial effects of the technical solution provided by the embodiments of the present invention at least include:

[0019] The vacuum coating paint provided by the embodiments of the present invention uses acrylic polyol resin, low-functional polyurethane acrylate resin, high-functional polyurethane acrylate resin, active diluent, photoinitiator and additives in certain proportions. The above components work together, making the vacuum coating paint not only have good color development to meet the color design requirements and effectively avoid color blooming, but also have good temperature resistance, water resistance, alkali 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, thus improving the three-coat process for the current 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 technologies. Detailed Embodiments

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] The embodiments of the present invention provide a novel vacuum coating paint, which includes the following components in parts by weight: 5 to 10 parts of acrylic polyol resin; 18 to 25 parts of low-functional polyurethane acrylate resin; 8 to 10 parts of high-functional polyurethane acrylate resin; 10 to 15 parts of active diluent; 2 to 5 parts of photoinitiator; 0.4 to 1 part of additive; 40 to 60 parts of organic solvent.

[0022] Exemplarily, some examples of the parts by weight of the acrylic polyol 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.

[0023] Some examples of the parts by weight of the low-functional polyurethane acrylate resin in the paint can be any one of the following values or the value range composed of any two of them: 18, 19, 20, 21, 22, 23, 24, 25, etc.

[0024] Some examples of the parts by weight of the high-functional polyurethane acrylate resin in the paint can be any one of the following values or the value range composed of any two of them: 8, 8.5, 9, 9.5, 10, etc.

[0025] Some examples of the parts by weight of the active diluent in the paint can be any one of the following values or the value range composed of any two of them: 10, 11, 12, 13, 14, 15, etc.

[0026] Some examples of the parts by weight of the photoinitiator in the coating can be any one of the following values or the range of values formed by any two of them: 2, 2.5, 3, 3.5, 4, 4.5, 5, etc.

[0027] Some examples of the parts by weight of the auxiliary agent in the coating can be any one of the following values or the range of values formed by any two of them: 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, etc.

[0028] Some examples of the parts by weight of the organic solvent in the coating can be any one of the following values or the range of values formed by any two of them: 40 parts, 41 parts, 42 parts, 43 parts, 44 parts, 45 parts, 46 parts, 47 parts, 48 parts, 49 parts, 50 parts, 51 parts, 52 parts, 53 parts, 54 parts, 55 parts, 56 parts, 57 parts, 58 parts, 59 parts, 60 parts.

[0029] The vacuum coating paint provided by the embodiment of the present invention uses a certain proportion of acrylic polyol resin, low-functional polyurethane acrylate resin, high-functional polyurethane acrylate resin, reactive diluent, photoinitiator and auxiliary agent. The above components act synergistically, making the vacuum coating paint not only have good color development to meet the color design requirements and effectively avoid the phenomenon of color blooming, but also have good temperature resistance, water resistance, alkali 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 the current 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.

[0030] The following will respectively give an exemplary description of the functions of each component in the vacuum coating paint.

[0031] For the acrylic polyol resin, it refers to a polymer obtained by copolymerizing acrylic monomers with hydroxyl groups (-OH), styrene monomers, etc. Generally, the acrylic polyol resin can be prepared by solution polymerization of acrylic monomers containing various polymerizable monomers and hydroxyl groups in the presence of a free radical polymerization initiator.

[0032] When conventional thermoplastic acrylic resins are applied to vacuum coating paints, due to their relatively fast drying speed, problems such as uneven drying speed in different spraying areas of the product and obvious color blooming aggregation occur. Research has found that acrylic polyol resins usually have a relatively large molecular weight. When applied to vacuum coating paints, they have excellent color development properties for color pastes, good leveling properties and fullness, and can effectively avoid some problems brought by conventional thermoplastic acrylic resins.

[0033] In addition, in a low-temperature environment, conventional thermoplastic acrylic resins usually cause the brittleness of the paint film to increase, making the paint film hard and easy to fall off. However, the film layer made of acrylic polyol resin shows good flexibility at low temperatures. After automotive interior testing, the paint film obtained from the vacuum coating paint that meets the above formula of the embodiment of the present invention shows good physical properties, including good flexibility, under the temperature conditions of -40°C to 110°C for 168 hours. It can be seen that using acrylic polyol resin improves both the appearance quality and physical properties of the paint film.

[0034] Some acrylic polyol resins applicable to the embodiments of the present invention can be hydroxyl acrylic resins.

[0035] In order to enhance the above functions brought by acrylic polyol resins, in some examples, the acrylic polyol resin satisfies at least one of the following physical property parameters: hydroxyl value of 50mgKOH / g - 120mgKOH / g, acid value of 3.0mgKOH / g - 15mgKOH / g, glass transition temperature of 70°C to 80°C. Further, the acrylic polyol resin simultaneously satisfies the above three physical property parameters.

[0036] Further, some examples of acrylic polyol resins that meet the above physical property parameter conditions can be DIC ZHP-241 and Nantac AC3082 produced and sold by Nantac Chemical (Heshan) Co., Ltd., Canada.

[0037] Low-functional polyurethane acrylate resins are used in combination with high-functional polyurethane acrylate resins to balance the possible problem of paint film cracking caused by high-functional polyurethane acrylate resins.

[0038] In some examples, for low-functional polyurethane acrylate resins, their functionality can be 3 - 4. That is to say, they can be trifunctional polyurethane acrylate resins, or tetrafunctional polyurethane acrylate resins, or a combination of trifunctional polyurethane acrylate resins and tetrafunctional polyurethane acrylate resins. This type of resin has at least the following advantages: relatively low viscosity, good flexibility, strong adhesion, good compatibility with other resins, can provide good adhesion effects, and balance the shrinkage effects of high-functional polyurethane acrylate resins, which is more conducive to film formation.

[0039] Furthermore, the above trifunctional polyurethane acrylate resin and tetrafunctional polyurethane acrylate resin, especially the tetrafunctional polyurethane acrylate resin, satisfy at least one of the following physical property parameters: viscosity of 4800 cps to 6800 cps, acid value of 3.5 mg KOH / g - 5.5 mg KOH / g, so as to further ensure its above functions. Some examples of low-functional polyurethane acrylate resins that meet the above physical property parameters can be Changxing 6130B-80, Wuxing W3360, etc.

[0040] The coating provided by the embodiment of the present invention can provide excellent scratch resistance and meet the overall sealing property by selecting a high-functional polyurethane acrylate resin. For example, the functionality of the high-functional polyurethane acrylate resin is six. The structural characteristics of the six-functional resin enable it to provide excellent curing speed during the curing process, form a highly crosslinked network structure, significantly improve the hardness, wear resistance and scratch resistance of the coating, and enable it to better resist external mechanical damage. At the same time, the six-functional polyurethane acrylate resin also has excellent chemical resistance and weather resistance.

[0041] Furthermore, the viscosity of the six-functional polyurethane acrylate resin is 60000 cps to 90000 cps. Within this viscosity range, it is easy to construct and coat, and has good film-forming properties. Some examples of high-functional polyurethane acrylate resins that meet the above physical property parameters can be Huihe 6800A, EB1290N, etc.

[0042] For the reactive diluent, it can be a monofunctional acrylate monomer and a polyfunctional acrylate monomer, so as to play a good role in regulating the dispersion effect of each component in the coating, participating in the curing reaction and improving the film properties.

[0043] Some suitable reactive diluents are selected from at least one of Hydroxyethyl Methacrylate (HEMA), Isobornyl Acrylate (IBOA), Oxybis(methyl-2,1-ethanediyl)diacrylate (HDDA), Trimethylolpropane Triacrylate (TMPTA), Dipentaerythritol Hexaacrylate (DPHA), Pentaerythritol Triacrylate (PET3A).

[0044] Further, the reactive diluent includes 5 parts to 8 parts of HEMA and 5 parts to 8 parts of PET3A. Among them, the monofunctional acrylate monomer HEMA has an excellent dispersion effect on the color paste and other components, and its parts by weight can be 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, etc. The trifunctional acrylate monomer PET3A can provide crosslinking density, making the performance of the paint film more stable, and its parts by weight can be 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, etc.

[0045] In some examples, the additives involved in the embodiments of the present invention may be silicone leveling agents and phosphate ester additives.

[0046] The silicone leveling agent provides an overall leveling effect, effectively avoiding the occurrence of problems such as Benard vortices and pinholes. In some examples, the parts by weight of the silicone leveling agent in the coating can be 0.2 parts to 0.5 parts, and some examples of the silicone leveling agent can be at least one of BYK306, BYK333, and AFKA3777.

[0047] The phosphate ester additive is beneficial to improving the adhesion of the coating to metal coatings, such as aluminum layers, and can participate in the crosslinking polymerization reaction occurring in the coating. In particular, the phosphate ester additives have a low surface tension, which can reduce the interfacial tension between the pigment particles and the surrounding medium, making the pigment particles more easily wetted by the dispersion medium, thereby promoting the uniform dispersion and stability of the pigment in the coating.

[0048] In some examples, the parts by weight of the phosphate ester additive in the coating can be 0.2 parts to 0.5 parts, and some examples of the phosphate ester additive can be Sartomer CD9051, Solvay Rhodafac RS-610, RS-710, DS-4AP emulsifier, etc.

[0049] For the photoinitiator, it can be a free radical photoinitiator to absorb energy and cure in multiple bands, making the paint film cure more thoroughly.

[0050] In some examples, the photoinitiator is selected from at least one of photoinitiator TPO (2,4,6-trimethylbenzoyl-diphenylphosphine oxide), photoinitiator 184 (1-hydroxy-cyclohexyl-phenylmethanone), and photoinitiator TMO (2,4,6-trimethylbenzoyl-diphenylphosphine oxide), so as to obtain a better polymerization initiation effect.

[0051] Furthermore, the photoinitiator can be a combination of photoinitiator 184 and photoinitiator TMO, which is beneficial to improving the curing degree of the coating system without causing fogging problems, strengthening the sealing property of the paint film, and enhancing its water resistance. After testing, when the combination of photoinitiator 184 and photoinitiator TMO is used, the paint film shows excellent hydrolysis resistance in the hydrolysis test (placed at 90 °C and 96% humidity for 72 h).

[0052] The organic solvents applicable to the vacuum coating paint provided by the embodiments of the present invention are selected from at least one of ethyl acetate (EAC), butyl acetate (BAC), propylene glycol methyl ether acetate (PMA), and methyl isobutyl ketone (MIBK).

[0053] Furthermore, the organic solvents can be selected from the composition of EAC, BAC, PMA, and MIBK. This is because excessive amounts of fast-evaporating solvents such as EAC and BAC are likely to cause obvious water absorption and whitening, and are also likely to cause thick edge conditions. Therefore, the slow-evaporating solvent PMA is needed to balance the drying speed. MIBK has good solubility for color pastes and a slow evaporation rate. The four organic solvents cooperate synergistically to jointly adjust the overall evaporation rate, effectively preventing problems such as pinholes and whitening caused by too fast evaporation of the paint, and preventing the problem that too slow evaporation of the paint will affect the film performance.

[0054] In some embodiments, the vacuum coating paint provided by the embodiments of the present disclosure further includes nano-color paste, and the mass percentage of the nano-color paste in the vacuum coating paint can be 3% - 5%.

[0055] According to the actual color requirements, nano-color pastes of appropriate colors are selected. For example, for nickel metal coatings, black nano-color paste can be used to enhance the texture of nickel metal. For aluminum metal coatings, black nano-color paste, silver nano-color paste, gunmetal nano-color paste, gold nano-color paste, etc. can be used.

[0056] Some examples of the mass percentage of the nano-color paste in the vacuum coating paint can be any one of the following values or the numerical range composed of any two of these values: 3%, 3.5%, 4%, 4.5%, 5%, etc.

[0057] For any of the above-mentioned vacuum coating paints, it can be prepared by the following method:

[0058] (1) Add acrylic polyol resin and part of the solvent to a container and stir evenly. For example, stir at a speed of 500 revolutions per minute - 1000 revolutions per minute for 5 - 10 minutes.

[0059] (2) Continuously add low-functional polyurethane acrylate resin, high-functional polyurethane acrylate resin, reactive diluent, photoinitiator, additives and the other part of the solvent into the container, and stir evenly. For example, stir at a speed of 600 - 800 revolutions per minute for 40 - 60 minutes.

[0060] (3) Continuously add the remaining solvent to adjust the viscosity of the coating (for example, 8.3 s ± 0.2 s, Iwata No. 2 cup, 25 °C), and then filter it for standby. Among them, the filtration can be carried out in sequence as follows: 0.5 μm filter bag - 0.25 μm filter element - 0.1 μm filter element.

[0061] 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.

[0062] 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 on the surface of the primer to present a certain metallic texture. Further, adopt processes such as spraying, brushing, and roller coating, and use the vacuum coating paint provided by the embodiments of the present invention to coat a topcoat paint on the surface of the metal coating. After UV curing, a topcoat attached to the metal coating is obtained. Thus, a multi-layer coating is formed on the plastic parts, which not only endows the plastic parts with 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.

[0063] On yet another aspect, the embodiments of the present invention also provide 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, wherein the topcoat is prepared by using any one of the above-mentioned vacuum coating paints.

[0064] The coated plastic part provided by the embodiments of the present invention has all the advantages of the above-mentioned vacuum coating paint, making the plastic part not only have excellent metallic texture, but also have 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.

[0065] As described above, 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 on the surface of the primer, such as a nickel metal coating, to present a certain metallic texture. Further, adopt processes such as spraying, brushing, and roller coating, and use the vacuum coating paint provided by the embodiments of the present invention to coat a topcoat paint on the surface of the metal coating. After UV curing, a topcoat attached to the metal coating is obtained.

[0066] The preparation process of the exemplary topcoat can be as follows: The topcoat plating is implemented by processes such as spraying, brushing, and roller coating. For example, taking spraying as an example, spraying is carried out with compressed air at 0.3 - 0.5 Mpa, the spray gun orifice diameter is 0.8 mm - 1.4 mm, the coating environment humidity is 30% - 70%, and the distance between the spray gun orifice and the spraying substrate is 25 cm.

[0067] A coating liquid film is formed on the surface of the metal coating, baked at 60 ± 5 °C for 5 min - 10 min to form a coating with a film thickness of 18 ± 3 μm, and then UV cured with a curing energy of 800 mj / cm 3 ~1100 mj / cm 3 , thus forming the topcoat.

[0068] 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 set forth herein. For those where specific techniques or conditions are not indicated 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 reagents or instruments whose manufacturers are not indicated, they are all conventional products that can be obtained through commercial purchase.

[0069] Examples 1 - 6 respectively provide a vacuum coating paint, and Comparative Examples 1 - 5 respectively provide comparative paints. Their formulations can be seen in Table 1 below, where the values involved in Table 1 all represent the weight parts of each component.

[0070] For Examples 1 - 6 and Comparative Examples 1 - 5, the raw material information of each component is as follows:

[0071] (1) Acrylic polyol resin, including: DAICEL ZHP - 241, Nonda AC3082.

[0072] (2) Low - functionality polyurethane acrylate resin, including: Changxing 6130B - 80, Wuxing W3360.

[0073] (3) Hexa - functionality polyurethane acrylate resin, including: Huihe 6800A, EB1290N.

[0074] (4) Reactive diluent, including: HEMA, PET3A (Changxing EM235).

[0075] (5) Photoinitiator includes: Photoinitiator 184, Photoinitiator TPO, Photoinitiator TMO.

[0076] (6) The leveling agent is BYK - 333, and the phosphate ester auxiliary agent is CD9051.

[0077] (7) The solvents include: EAC, BAC, PMA, MIBK.

[0078] (8) The nano-color paste is SAP BLACK B-780 of Yisan Chemical Co., Ltd., and the mass percentage of the nano-color paste in the vacuum coating paint is 4%, and the nano-color paste is not listed in Table 1.

[0079] For the paints involved in Examples 1-6 and Comparative Examples 1-5, the preparation processes of the respective paints are as follows:

[0080] (1) Add acrylic polyol resin and BAC solvent into a container, and stir at a speed of 800 revolutions per minute for 5-10 minutes.

[0081] (2) Continuously add the other components except the EAC solvent into the container, and stir evenly at a speed of 600 revolutions per minute.

[0082] (3) Finally, add the EAC solvent, adjust the viscosity of the paint (8.3s ± 0.2s, Iwata No. 2 cup, 25 °C). After the viscosity is qualified, perform the following filtration operations: 0.5um filter bag - 0.25um filter element - 0.1um filter element.

[0083] Prepare the paints involved in Examples 1-6 and Comparative Examples 1-5 into coatings, and the process is as follows: Implement topcoat plating using the spraying process, apply each paint to the sample to form a topcoat layer. Among them, the sample has been plated with a metal aluminum coating, and the paint is applied to the metal aluminum coating. Among them, the spraying process parameters are as follows: Spray with compressed air at 0.34 Mpa, the gun nozzle diameter is 1 mm, the humidity of the painting environment is 50%, and the distance between the gun nozzle and the sprayed sample is 25 cm. A paint liquid film is formed on the surface of the metal aluminum coating, baked at 60 ± 5 °C for 10 min to form a coating with a film thickness of 18 ± 3 μm, and then UV cured, and the curing energy is 1100 mj / cm 3 , to form a topcoat layer.

[0084] Test the following properties of the topcoat layers corresponding to Examples 1-6 and Comparative Examples 1-5. The following tests are carried out according to the currently known tests for automotive interior vacuum coating parts, and the test methods are as follows. The test results are listed in Table 2.

[0085] (a) Boiling water test: Place the sample with the topcoat layer in boiling water at 100 °C for 2 h, leave it at room temperature for 30 min, then observe the surface state of the topcoat layer and perform an adhesion test. Among them, the adhesion test is carried out according to the DIN EN ISO2409 test standard, and the tape used is TESA 4657a.

[0086] (b) Hydrolysis test: Store the sample with the topcoat in a climatic chamber at 90 ± 2°C and 96% humidity for 72 h. Take it out and let it stand for 2 h. Determine its adhesion according to the test standard of DIN EN ISO2409.

[0087] (c) Water condensation test: Store the sample with the topcoat in a condensation water test chamber at 40 ± 3°C and 100% humidity for 240 h. After the experiment, let it stand at room temperature for 30 min, observe its surface condition and conduct an adhesion test according to the test standard of DIN EN ISO2409.

[0088] (d) Neutral salt spray test: Conduct a neutral salt spray test (NSS test) on the sample with the topcoat according to GB / T 10125-2012 "Artificial atmosphere corrosion test - Salt spray test", and the test time is 24 h.

[0089] (e) High-temperature resistance test: Place the sample with the topcoat in a dry environment at 110°C for 168 h, then take it out, let it stand for 30 min, observe its surface condition and conduct an adhesion test according to the test standard of DIN EN ISO2409.

[0090] Table 1

[0091]

[0092]

[0093] Table 2

[0094]

[0095]

[0096] Combining Table 1 and Table 2, it can be seen that for the vacuum coating paint provided by the embodiments of the present invention, based on its improved formula, the topcoat prepared from this paint effectively solves the problem of topcoat blooming. 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. Moreover, the topcoat can also pass a series of basic tests for common automotive interior parts such as adhesion, boiling water, and hydrolysis, enabling it to have excellent mechanical properties and be suitable for automotive interior coating.

[0097] 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 parts by weight:

2. The vacuum coating paint according to claim 1, wherein The acrylic polyol resin satisfies at least one of the following physical property parameters: hydroxyl value 50mgKOH / g - 120mgKOH / g, acid value 3.0mgKOH / g - 15mgKOH / g, glass transition temperature 70°C - 80°C.

3. The vacuum coating paint according to claim 1, wherein The functionality of the low functionality polyurethane acrylate resin is 3 - 4; The low functionality polyurethane acrylate resin satisfies at least one of the following physical property parameters: viscosity 4800cps - 6800cps, acid value 3.5mgKOH / g - 5.5mgKOH / g.

4. The vacuum coating paint according to claim 1, wherein The high functionality polyurethane acrylate resin is a hexa - functionality polyurethane acrylate resin; The viscosity of the hexa - functionality polyurethane acrylate resin is 60000cps - 90000cps.

5. The vacuum coating paint according to claim 1, characterized in that, The reactive diluent is selected from at least one of HEMA, IBOA, HDDA, TMPTA, DPHA, PET3A.

6. The vacuum coating paint according to claim 5, wherein The reactive diluent comprises 5 - 8 parts of HEMA and 5 - 8 parts of PET3A.

7. The vacuum coating paint according to any one of claims 1-6, characterized in that, The additives include an organosilicon leveling agent and a phosphate ester additive; The weight of the organosilicon leveling agent is 0.2 - 0.5 parts, and the weight of the phosphate ester additive is 0.2 - 0.5 parts.

8. The vacuum coating paint according to any one of claims 1-7, characterized in that, The photoinitiator is selected from at least one of photoinitiator TPO, photoinitiator 184, photoinitiator TMO.

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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