Fingerprint-resistant environmentally-friendly clear varnish and preparation method thereof

Abstract

The present application provides a kind of fingerprint-resistant environment-friendly varnish coating, which comprises, by mass percentage: high solid content acrylic resin 10.0-60.0%, high solid content polyester resin 10.0-50.0%, anti-fingerprint material 1.0-15.0%, auxiliary agent 0.6-25.0%, fluorine solvent 1.0-10.0%, solvent 2.0-10.0%; the content of each component above is 100.0%. The varnish coating has the characteristics of high solid content, high gloss, high transparency and fingerprint resistance, and has very low VOC and long-term stability, meets the requirements of green environmental protection, and is especially suitable for helmet coating field. The present application also relates to a preparation method of the above-mentioned fingerprint-resistant environment-friendly varnish coating.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of paint. Specifically, the present application relates to a fingerprint-resistant environmentally friendly clear paint and a preparation method thereof. BACKGROUND

[0002] There are three main requirements for end users such as e-scooter and motorcycle riders during the daily wearing of helmets:

[0003] (1) Safety of the helmet. As the last line of defense for the rider, the safety of the helmet is the first among all performances, so helmet manufacturers design new helmets according to different safety standards to meet higher safety requirements.

[0004] (2) Decoration of the helmet. In addition to the basic performance of safety, the appearance of the helmet directly affects the purchasing behavior of the customers. A helmet with an attractive appearance and a bright coating often becomes a best-selling product of the year, so helmet manufacturers are also constantly pursuing higher quality of appearance design, in which the transparency, gloss and leveling of the surface varnish play an indispensable role in the display of the appearance design of the helmet product.

[0005] (3) Durability of the performance of the helmet. According to statistics, the average service life of an e-scooter helmet is 1-2 years, and the average service life of a motorcycle helmet is 0.5-1 year, so it is also important whether the appearance performance of the helmet can be maintained at the original level for as long as possible.

[0006] In addition to the needs of end users, solvent emissions during the manufacturing process of helmets have been a problem for the entire helmet manufacturing industry, especially in the field of helmet coatings. The current mainstream helmet coatings mainly focus on low-solid two-component polyurethane crosslinking systems, with a solid content generally lower than 50%. During the application process, there is a large amount of solvent emission, which does not meet the national green environmental protection requirements. The cost of waste gas and waste material treatment accounts for a large part of the cost of helmet manufacturers every year. Therefore, helmet manufacturers are actively introducing new processes and products to reduce the generation of waste gas and waste materials in order to achieve the purpose of cost reduction and efficiency improvement.

[0007] At present, there is no good environmental protection solution to solve the problem of coatings in the helmet manufacturing industry. The main constraint is that the workability of water-based coatings is too dependent on environmental control, and the solid content of helmet solvent-based coatings cannot be increased to more than 60%. In addition, the coatings prepared by the existing technology are difficult to meet the performance requirements of high solid content, high gloss and fingerprint resistance while meeting the requirements of high solid content and high gloss.

[0008] Therefore, the present application aims to provide an environmentally friendly clear paint with high solid content, high gloss, high transparency and fingerprint resistance to solve the problems faced by the existing helmet manufacturing industry. SUMMARY

[0009] Based on the above facts, the present application aims to provide a fingerprint-resistant environmentally-friendly clear paint and a preparation method thereof, which has high solid content, high gloss, high transparency, fingerprint resistance, very low VOC and long-term stability, and meets the requirements of green environmental protection. After curing, the paint can meet the requirements of helmet manufacturers in terms of decoration and fingerprint resistance.

[0010] The first aspect of the present application provides a fingerprint-resistant environmentally-friendly clear paint, which comprises the following components in mass percentage:

[0011]

[0012] The content of each component above accounts for 100.0%.

[0013] Further, in the fingerprint-resistant environmentally-friendly clear paint, the auxiliary agent includes a defoaming agent, a wetting agent, a light stabilizer, an ultraviolet absorber and a thickening agent, and the components in the fingerprint-resistant environmentally-friendly clear paint include:

[0014]

[0015] The content of each component above accounts for 100.0%.

[0016] In a preferred embodiment of the present application, the components in the fingerprint-resistant environmentally-friendly clear paint include:

[0017]

[0018] The content of each component above accounts for 100.0%.

[0019] In a more preferred embodiment of the present application, the components in the fingerprint-resistant environmentally-friendly clear paint include:

[0020]

[0021] The content of each component above accounts for 100.0%.

[0022] High solid acrylic resin

[0023] In some embodiments of the present application, the high solid content acrylic resin includes:

[0024] (1) an acrylic resin that simultaneously satisfies the conditions of greater than 70% and less than 80% of weight solid content, greater than 2.5% of weight content of hydroxyl, greater than 2000 and less than 6000 of number average molecular weight;

[0025] (2) acrylic resin satisfying simultaneously weight solid content greater than 80%, hydroxyl weight content greater than 3.5%, number average molecular weight greater than 500 and less than 2000;

[0026] (3) combination of (1) and (2).

[0027] Specifically, the high solid content acrylic resin is selected from one or more of K-Flex UD350W, K-Flex UD320 type acrylic resin provided by Kings Company, Setalux 1198-SS-70, Setalux 1262-SS-70, Setalux 1795-VX-74, Setalux 1917-BA-80YB, Setalux 1917-BA-75 type acrylic resin provided by Allnex Zannan Company.

[0028] High solid polyester resin

[0029] In some embodiments of the present application, the high solid content polyester resin includes one or more of linear polyester resin, branched polyester resin with a degree of branching greater than 2 and less than 4.

[0030] Specifically, the high solid content polyester resin includes:

[0031] (1) linear polyester resin satisfying simultaneously hydroxyl weight content greater than 4.0%, number average molecular weight less than 2000;

[0032] (2) linear polyester resin satisfying simultaneously hydroxyl weight content greater than 2.0% and less than 4.0%, number average molecular weight greater than 2000 and less than 6000;

[0033] (3) branched polyester resin satisfying simultaneously hydroxyl weight content greater than 4.0%, number average molecular weight less than 2000, degree of branching greater than 2 and less than 4;

[0034] (4) branched polyester resin satisfying simultaneously hydroxyl weight content greater than 2.0% and less than 4.0%, number average molecular weight greater than 2000 and less than 6000, degree of branching greater than 2 and less than 4;

[0035] (5) any combination of the above four polyester resins.

[0036] More specifically, the high solid polyester resin is selected from one or more of K-Flex 188 polyester resin from Kings, Novasynt 8815S-70, Uralac SN820, Novasynt 8811, Novasynt 8815, Uralac SN805 polyester resins from Desmose, CAPA 2054, 205CP, 3050 polyester resins from Perstorp.

[0037] Anti-fingerprint materials

[0038] In some embodiments of the present application, the anti-fingerprint material comprises one or more of silicone-modified acrylic resin, fluorosilicone-modified acrylic resin, PVDF resin, PTFE resin, and FEVE resin.

[0039] Specifically, the anti-fingerprint material comprises:

[0040] (1) silicone-modified acrylic resin that simultaneously satisfies a hydroxyl weight content of less than 3.0%, a number average molecular weight of greater than 2000 and less than 6000, and a silicon weight content of greater than 5% and less than 20%;

[0041] (2) fluorosilicone-modified acrylic resin that simultaneously satisfies a hydroxyl weight content of less than 3.0%, a number average molecular weight of greater than 2000 and less than 6000, a silicon weight content of greater than 1% and less than 5%, and a fluorine weight content of greater than 5% and less than 30%;

[0042] (3) PVDF polyvinylidene fluoride resin that simultaneously satisfies a number average molecular weight of greater than 3000 and less than 1200000, and a melting point of greater than 140°C and less than 220°C;

[0043] (4) PTFE polytetrafluoroethylene resin that simultaneously satisfies a number average molecular weight of greater than 1000 and less than 1000000, and a melting point of greater than 200°C and less than 500°C;

[0044] (5) FEVE copolymer of fluoroolefin and alkyl vinyl ether that simultaneously satisfies a number average molecular weight of greater than 2000 and less than 200000, a weight solid content of greater than 25% and less than 65%, and a fluorine weight content of greater than 7% and less than 40%;

[0045] (6) a combination of any one or more of (1) to (5).

[0046] More specifically, the anti-fingerprint material is selected from one or more of SH9603, SH-024 type silicone-modified acrylic resin provided by Hubei Xin Sihai, JZ9540, JZ9522 type silicone-modified acrylic resin provided by Jiazhi New Material Company, TB 602 type fluorosilicon-modified acrylic resin provided by Xinxing Company, Teflon PTFE, Tedlar PVF type resin provided by DuPont Company, Polyflon PTFE type resin provided by Daikin Company, PVDF 740, PVDF 761, Kynar 500 type resin provided by Arkema Company, JF-50X2 FEVE, JF-50X3 FEVE type fluorocarbon resin provided by Dongluofuhe Company, Lumiflon 4400FE, Lumiflon 1001FE type fluorocarbon resin provided by AGC Company.

[0047] additives

[0048] The auxiliary agent includes, but is not limited to, a combination of one or more of a defoaming agent, a wetting agent, a light stabilizer, an ultraviolet absorber, and a thickening agent. Specifically:

[0049] (1) Defoaming agent

[0050] In some embodiments of the present application, the defoaming agent includes, but is not limited to, one or more of BYK-A530, BYK-392, BYK-141 type defoaming agent provided by BYK Company, Tego 962, Tego 900 type defoaming agent provided by Degoya Company.

[0051] (2) Wetting agent

[0052] In some embodiments of the present application, the wetting agent includes, but is not limited to, one or more of BYK-315, BYK-306, BYK-300, BYK-333 type wetting agent provided by BYK Company, Tego 245 type wetting agent provided by Degoya Company, Surfynol 104, Surfynol 440 type wetting agent provided by Wincell Dks.

[0053] (3) Light stabilizer

[0054] In some embodiments of the present application, the light stabilizer includes, but is not limited to, one or more of Tinuvin 123, Tinuvin 292, Tinuvin 249 type light stabilizer provided by BASF Company, Chiguard 101 type light stabilizer provided by Qiqi Titanium Company.

[0055] (4) Ultraviolet absorber

[0056] In some embodiments of the present application, the ultraviolet absorber includes, but is not limited to, one or more of Tinuvin 400, Tinuvin 900, Tinuvin 928, Tinuvin 405 type ultraviolet absorber provided by BASF, Chiguard 5582, Chiguard 5400 type ultraviolet absorber provided by Chengu.

[0057] (5) thickening agent

[0058] In some embodiments of the present application, the thickening agent includes, but is not limited to, one or more of CAB 381-2, CAB 381-0.5, CAB 381-0.1, CAB 551-0.2 type thickening agent provided by Eastman.

[0059] Fluorinated solvents

[0060] In a preferred embodiment of the present application, the fluorine solvent is a fluorine solvent that simultaneously satisfies the conditions of greater than 30% fluorine content by weight, a boiling point greater than 60°C and less than 120°C, a surface tension greater than 12 mN / m and less than 20 mN / m.

[0061] Specifically, the fluorine solvent is selected from one or more of Novec 7100, 7200, 7300 type fluorine solvents provided by 3M, ASAHIKLIN AE-3000, AC-2000, AC-6000 type fluorine solvents provided by AGC.

[0062] solvent

[0063] In a preferred embodiment of the present application, the solvent includes, but is not limited to, one or more of butyl acetate, dimethylbenzene, propylene glycol methyl ether acetate, ethylene glycol butyl ether acetate, isopropyl alcohol, butanone, butanol, methyl butyl ketone.

[0064] The second aspect of the present application provides a preparation method of the fingerprint-resistant environmentally friendly clear varnish coating as described above. The preparation method comprises the following steps:

[0065] (1) In a reaction vessel, sequentially add high solid content acrylic resin, high solid content polyester resin, defoaming agent, wetting agent, fluorine solvent and part of the solvent under stirring, and then use a high-speed dispersing machine to disperse for 15-30 min to make them uniformly mixed, wherein the stirring rate is controlled at 600-1000 rpm;

[0066] (2) Add light stabilizer, ultraviolet absorber and thickening agent to the uniformly mixed material obtained in step (1), and continue to disperse at a high speed under the condition of 1000-1500 rpm to make the thickening agent uniformly mixed;

[0067] (3) adding anti-fingerprint material to the material obtained in step (2) and continuing to disperse at high speed for 30 min, and then adjusting the viscosity of the obtained paint using the remaining solvent, so that the viscosity of the obtained paint is greater than 100 mPas.s and less than 2000 mPas.s at 23°C, to obtain the anti-fingerprint environmental-friendly clear paint.

[0068] Preferably, the viscosity of the obtained paint is greater than 200 mPas.s and less than 1500 mPas.s at 23°C.

[0069] Advantages of the present application

[0070] According to the present application, the anti-fingerprint environmental-friendly clear paint has the characteristics of high gloss, high solid content, high transparency and anti-fingerprint under the synergistic effect of high solid content acrylic resin, high solid content polyester resin and anti-fingerprint material, can provide decorative effect while having excellent anti-fingerprint performance, and has very low VOC and long-term stability. It is particularly suitable for use in the field of helmet coating systems.

[0071] It should be understood that each of the technical features described above and the technical features specifically described in the following embodiments can be combined with each other to form new or preferred technical solutions, which should all belong to the protection scope of the present application. Due to the limited space, they will not be listed one by one here. DETAILED DESCRIPTION

[0072] The present application will be further described in conjunction with specific examples. It should be understood that these examples are only used to illustrate the present application and should not limit the protection scope of the present application. The experimental methods in the following examples are not specified, which are usually carried out according to the conventional conditions or the conditions recommended by the manufacturers. Unless otherwise specified, the percentages and parts are mass percentages and mass parts. The experimental materials and reagents used in the following examples can be obtained from the market.

[0073] Example 1 Preparation of fingerprint-resistant environmentally friendly varnish coating 1

[0074] The anti-fingerprint environmental-friendly clear paint 1 of the present application was prepared according to the following Table 1 formula:

[0075] Table 1 Composition of anti-fingerprint environmental-friendly clear paint 1

[0076]

[0077]

[0078] The anti-fingerprint environmental-friendly clear paint 1 was prepared by the following method:

[0079] (1) In a reaction vessel, high solid acrylic resin Setalux 1917-BA-75 40g, high solid polyester resin K-Flex 188 40g, defoaming agent BYK-A530 0.2g, wetting agent BYK-306 0.2g, fluorine solvent Novec 7200 5g and solvent butyl acetate 4g were added in sequence under stirring, and then dispersed for 15-30 min using a high-speed disperser to make them uniformly mixed, wherein the stirring rate was controlled at 600-1000 rpm;

[0080] (2) To the uniformly mixed material obtained in step (1), light stabilizer Tinuvin 123 0.1g, ultraviolet absorber Tinuvin 400 0.1g and thickening agent CAB 381-2 0.1g were added, and high-speed dispersion was continued at 1000-1500 rpm to make the thickening agent uniformly mixed;

[0081] (3) To the material obtained in step (2), anti-fingerprint material JZ9540 9.8g was added, and high-speed dispersion was continued for 30 min. After the mixture was uniformly mixed, 0.5g of butyl acetate solvent was used to adjust the viscosity of the obtained paint, so that the viscosity at 23°C was greater than 100 mPas.s and less than 2000 mPas.s. Thus, the anti-fingerprint environmentally friendly clear paint 1 was obtained.

[0082] Example 2 Preparation of fingerprint-resistant environmentally friendly varnish coating 2

[0083] The anti-fingerprint environmentally friendly clear paint 2 of the present application was prepared according to the following Table 2:

[0084] Table 2 Composition of anti-fingerprint environmentally friendly clear paint 2

[0085]

[0086]

[0087] The anti-fingerprint environmentally friendly clear paint 2 was prepared by the following method:

[0088] (1) In a reaction vessel, high solid acrylic resin Setalux 1917-BA-75 40g, high solid polyester resin K-Flex 188 40g, defoaming agent BYK-A530 0.2g, wetting agent BYK-306 0.2g, fluorine solvent Novec 7200 5g and solvent butyl acetate 4g were added in sequence under stirring, and then dispersed for 15-30 min using a high-speed disperser to make them uniformly mixed, wherein the stirring rate was controlled at 600-1000 rpm;

[0089] (2) In the mixed material obtained in step (1), light stabilizer Tinuvin 1230.1 g, ultraviolet absorber Tinuvin 400 0.1 g and thickening agent CAB 381-2 0.1 g were added, and high-speed dispersion was continued at 1000-1500 rpm, so that the thickening agent was mixed uniformly;

[0090] (3) In the material obtained in step (2), anti-fingerprint material PVDF 7619.8 g was added, and high-speed dispersion was continued for 30 min. After being mixed uniformly, 0.5 g of butyl acetate solvent was used to adjust the viscosity of the obtained coating, so that the viscosity at 23°C was greater than 100 mPas.s and less than 2000 mPas.s, and the anti-fingerprint environmentally friendly clear paint 2 was obtained.

[0091] Comparative Example 1 Clearcoat 3

[0092] The comparative example 1 is a general paint PU000A high gloss clear paint sold in the existing helmet manufacturing industry. It is noted that the PU000A high gloss clear paint does not contain anti-fingerprint material, and the solid content of the PU000A high gloss clear paint is only 37.6%, which does not meet the demand of high solid content environmentally friendly paint. Therefore, it is not within the protection scope of the present application. The clear paint obtained in this comparative example has very low solid content, large VOC emission, which is not conducive to environmental protection, and its appearance and glossiness cannot fully meet the demand, and the anti-fingerprint performance is obviously poor.

[0093] Comparative Example 2 Preparation of Clearcoat 4

[0094] The clear paint 4 as a comparative example was prepared according to the following Table 3:

[0095] Table 3 Composition of clear paint 4

[0096] Components name Dosage Mass percentage High solid acrylic resin Setalux 1917-BA-75 49.8g 49.8％ High solid polyester resin K-Flex188 40g 40.0％ Additive 1 (defoaming agent) BYK-A530 0.2g 0.2％ Additive 2 (wetting agent) BYK-306 0.2g 0.2％ Additive 3 (Light Stabilizer) Tinuvin 123 0.1g 0.1％ Additive 4 (UV absorber) Tinuvin 400 0.1g 0.1％ Additive 5 (thickener) CAB 381-2 0.1g 0.1％ Fluorinated solvents Novec 7200 5g 5.0％ solvent Butyl acetate 4.5g 4.5％

[0097] The clear paint 4 was prepared by the following method:

[0098] (1) In a stirred state, high solid content acrylic resin Setalux 1917-BA-75 49.8 g, high solid content polyester resin K-Flex 188 40 g, defoaming agent BYK-A530 0.2 g, wetting agent BYK-306 0.2 g, fluorine solvent Novec 7200 5 g and solvent butyl acetate 4 g were sequentially added to a reaction vessel, and then a high-speed dispersion machine was used for dispersion for 15-30 min, so that they were mixed uniformly, wherein the stirring rate was controlled at 600-1000 rpm;

[0099] (2) To the mixture obtained in step (1), 0.1 g of light stabilizer Tinuvin 1230, 0.1 g of ultraviolet absorber Tinuvin 400 and 0.1 g of thickening agent CAB 381-2 were added, and high-speed dispersion was continued at 1000-1500 rpm to mix the thickening agent uniformly;

[0100] (3) The viscosity of the obtained paint was adjusted to be greater than 100 mPas.s and less than 2000 mPas.s at 23°C using 0.5 g of butyl acetate solvent, and the varnish paint 4 was obtained.

[0101] It should be noted that in this example, the varnish paint 4 does not contain an anti-fingerprint material in its composition, and therefore it is not within the scope of the present application, and is thus Comparative Example 2. The varnish paint lacking an anti-fingerprint material has poor fingerprint resistance and a serious fingerprint residue.

[0102] Comparative Example 3 Preparation of Clearcoat 5

[0103] A varnish paint 5 as a comparative example was prepared according to the formulation of Table 4 below:

[0104] Table 4 Composition of varnish paint 5

[0105] Components name Dosage Mass percentage High solid acrylic resin Setalux 1917-BA-75 40g 40.0％ High solid polyester resin K-Flex188 40g 40.0％ Anti-fingerprint materials JZ9540 9.8g 9.8％ Additive 1 (defoaming agent) BYK-A530 0.2g 0.2％ Additive 2 (wetting agent) BYK-306 0.2g 0.2％ Additive 3 (Light Stabilizer) Tinuvin 123 0.1g 0.1％ Additive 4 (UV absorber) Tinuvin 400 0.1g 0.1％ Additive 5 (thickener) CAB 381-2 0.1g 0.1％ solvent Butyl acetate 9.5g 9.5％

[0106] The varnish paint 5 was prepared by the following method:

[0107] (1) Under stirring, high solid content acrylic resin Setalux 1917-BA-75 40 g, high solid content polyester resin K-Flex 188 40 g, defoaming agent BYK-A530 0.2 g, wetting agent BYK-306 0.2 g and solvent butyl acetate 8.5 g were sequentially added to a reaction vessel, and high-speed dispersion was performed using a high-speed disperser for 15-30 min to mix them uniformly, wherein the stirring rate was controlled at 600-1000 rpm;

[0108] (2) To the mixture obtained in step (1), 0.1 g of light stabilizer Tinuvin 1230, 0.1 g of ultraviolet absorber Tinuvin 400 and 0.1 g of thickening agent CAB 381-2 were added, and high-speed dispersion was continued at 1000-1500 rpm to mix the thickening agent uniformly;

[0109] (3) In the material obtained in step (2), anti-fingerprint material JZ9540 9.8 g was added, and high-speed dispersion was continued for 30 min. After the mixture was uniformly mixed, 1.0 g of butyl acetate solvent was used to adjust the viscosity of the obtained coating, so that the viscosity at 23°C was greater than 100 mPas.s and less than 2000 mPas.s. Thus, the anti-fingerprint environmentally friendly varnish coating 5 was obtained.

[0110] It should be noted that in this example, the varnish coating 5 does not contain fluorine solvent in its composition, so it is not within the protection scope of the present application, and is therefore taken as Comparative Example 3. The lack of fluorine solvent will cause the appearance data, gloss and transparency of the paint film of the obtained varnish coating to decrease significantly.

[0111] Performance test methods and results

[0112] (1) Paint film preparation method:

[0113] The above varnish coatings 1-5 were mixed with 75% Desmodur N3300 curing agent, respectively, and the viscosity of all systems was adjusted to 1500-2000 mPas.s by butyl acetate, which was the construction viscosity.

[0114] Then, the varnish coatings 1-5 were respectively sprayed on 8 mm ABS plates using Langtech electrostatic rotary disc spraying (spraying parameters: gun speed: 0.5, pitch: 150 mm, rotary disc diameter: 18 cm, flow rate: 100, rotation speed: 3.5 krpm), and then flash dried at a temperature of 23°C and a humidity of 60% for 30 minutes, and then baked at 60°C for 4 hours.

[0115] The sprayed sample plates were maintained at room temperature for 7 days, and then the relevant performances were tested. The performances included appearance, hardness, construction solid content, construction state VOC, gloss, transparency, anti-fingerprint, etc.

[0116] (2) Test methods:

[0117] Appearance: GB / T 1721-1979

[0118] Hardness: GB / T 6739-1996

[0119] Construction solid content: GB / T 1725-1979

[0120] Construction VOC: GB / T 23985-2009

[0121] Gloss: GB / T 1743-1979

[0122] (3) Test results:

[0123] The test results are shown in Table 5 below:

[0124]

[0125] From the above Table 5, it can be seen that the varnish coating 3 of Comparative Example 1 is a commercially available conventional helmet varnish, which has very low application solid content and large VOC emission, is not conducive to environmental protection, and its appearance and gloss cannot fully meet the requirements. The fingerprint resistance is obviously weaker than that of Examples 1 and 2, and the fingerprint residue is more serious.

[0126] At the same time, the varnish coating 4 of Comparative Example 2 does not contain an anti-fingerprint material, and the fingerprint resistance is obviously weaker than that of Examples 1 and 2, and the fingerprint residue is more serious. The varnish coating 5 of Comparative Example 3 does not contain a fluorine solvent, and the film appearance data (Sw and DOI), gloss and transparency are significantly reduced, indicating that the fluorine solvent plays a role in increasing the transparency, smoothness and leveling property of the film.

[0127] In comparison, the anti-fingerprint environmentally friendly varnish coatings 1 and 2 of Examples 1 and 2 of the present application both contain the high solid content resin and the anti-fingerprint material used in the present application, and can achieve the effects of high solid content, low VOC emission, green environmental protection, and the film exhibits important properties such as high gloss and high transparency, and the fingerprint resistance is particularly excellent.

[0128] In summary, the anti-fingerprint environmentally friendly varnish coating provided by the present application has excellent anti-fingerprint performance while having high gloss, high solid content, high transparency and anti-fingerprint properties, and has very low VOC and long-term stability, which can meet the purpose of green environmental protection, and is particularly suitable for coating systems in the field of helmets.

[0129] Obviously, the above examples of the present application are only examples for clearly illustrating the present application, and are not limitations on the embodiments of the present application. For ordinary skilled persons in the art, other different forms of changes or variations can be made on the basis of the above description, and it is impossible to enumerate all the embodiments here. Any obvious changes or variations derived from the technical solutions of the present application still fall within the protection scope of the present application.

Claims

1. A fingerprint resistant, environmentally friendly clear varnish coating, in mass percent, comprising: The content of each of the above components totals 100.0%, of which, The additives include a combination of one or more of defoamers, wetting agents, light stabilizers, UV absorbers, and thickening agents, wherein: The high solid content acrylic resin is selected from one or more of an acrylic resin having a weight solid content greater than 70% and less than 80%, a hydroxyl weight content greater than 2.5%, a number average molecular weight greater than 2000 and less than 6000, and an acrylic resin having a weight solid content greater than 80%, a hydroxyl weight content greater than 3.5%, a number average molecular weight greater than 500 and less than 2000; The high solid content polyester resin is selected from one or more of a linear polyester resin, a branched polyester resin having a degree of branching greater than 2 and less than 4; The linear polyester resin is a linear polyester resin having a hydroxyl weight content greater than 4.0%, a number average molecular weight less than 2000, or a linear polyester resin having a hydroxyl weight content greater than 2.0% and less than 4.0%, a number average molecular weight greater than 2000 and less than 6000, The branched polyester resin is a branched polyester resin having a hydroxyl weight content greater than 4.0%, a number average molecular weight less than 2000, a degree of branching greater than 2 and less than 4, or a branched polyester resin having a hydroxyl weight content greater than 2.0% and less than 4.0%, a number average molecular weight greater than 2000 and less than 6000, a degree of branching greater than 2 and less than 4; The anti-fingerprint material is selected from one or more of a silicone modified acrylic resin, a fluorosilicone modified acrylic resin, a PVDF resin, a PTFE resin, and a FEVE resin; The silicone modified acrylic resin is a silicone modified acrylic resin having a hydroxyl weight content less than 3.0%, a number average molecular weight greater than 2000 and less than 6000, a silicon weight content greater than 5% and less than 20%, The fluorosilicone modified acrylic resin is a fluorosilicone modified acrylic resin having a hydroxyl weight content less than 3.0%, a number average molecular weight greater than 2000 and less than 6000, a silicon weight content greater than 1% and less than 5%, a fluorine weight content greater than 5% and less than 30%, The PVDF resin is a PVDF polyvinylidene fluoride resin having a number average molecular weight greater than 3000 and less than 1,200,000, a melting point greater than 140°C and less than 220°C, The PTFE resin is a PTFE polytetrafluoroethylene resin having a number average molecular weight greater than 1,000 and less than 1,000,000, a melting point greater than 200°C and less than 500°C, The FEVE resin is a FEVE copolymer of fluoroolefin and alkyl vinyl ether having a number average molecular weight greater than 2,000 and less than 200,000, a weight solid content greater than 25% and less than 65%, a fluorine weight content greater than 7% and less than 40%, The fluorine solvent is a fluorine solvent having a fluorine weight content greater than 30%, a boiling point greater than 60°C and less than 120°C, a surface tension greater than 12 mN / m and less than 20 mN / m; The solvent is selected from one or more of butyl acetate, xylene, propylene glycol methyl ether acetate, ethylene glycol butyl ether acetate, isopropyl alcohol, butanone, butanol, methyl butyl ketone.

2. The eco-friendly fingerprint resistant clear coating paint according to claim 1, wherein The auxiliary agent is a defoaming agent, a wetting agent, a light stabilizer, a UV absorber and a thickening agent, and the content of each component in the anti-fingerprint environmental-friendly clear paint is as follows in mass percentage: The content of each component is 100.0%.

3. The eco-friendly fingerprint resistant clear coating according to claim 2, wherein The content of each component in the anti-fingerprint environmental-friendly clear paint is as follows in mass percentage: The content of each component is 100.0%.

4. The eco-friendly fingerprint resistant clear coating according to claim 2, wherein The content of each component in the anti-fingerprint environmental-friendly clear paint is as follows in mass percentage: The content of each component is 100.0%.

5. A process for the production of a fingerprint-resistant, environmentally friendly clear varnish coating as claimed in any one of claims 2 to 4, characterized in that The content of each component in the anti-fingerprint environmental-friendly clear paint is as follows in mass percentage: The content of each component is 100.0%. The method comprises the following steps: (1) Under stirring, high solid content acrylic resin, high solid content polyester resin, defoaming agent, wetting agent, fluorine solvent and part of solvent are sequentially added into a reaction container, and then a high-speed dispersion machine is used for dispersing for 15-30 min to make them uniformly mixed, wherein the stirring speed is controlled to be 600-1000 rpm; 6. A process for the preparation of a fingerprint resistant, environmentally friendly clear varnish coating as claimed in claim 5, characterized in that, (2) Light stabilizer, UV absorber and thickening agent are added into the uniformly mixed material obtained in step (1), and high-speed dispersion is continuously carried out under the condition of 1000-1500 rpm to make the thickening agent uniformly mixed; (3) Anti-fingerprint material is added into the material obtained in step (2), and high-speed dispersion is continuously carried out for 30 min, and then the remaining solvent is used to adjust the viscosity of the obtained paint, so that the viscosity of the paint at 23℃ is greater than 100 mPas.s and less than 2000 mPas.s, and the anti-fingerprint environmental-friendly clear paint is obtained. The viscosity of the obtained paint at 23℃ is in the range of 200-1500 mPas.s.

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