CN108129971A - A kind of anti-scraping coating of environmental protection resistance and fingerprint resistance and its application method - Google Patents

Abstract

The present invention relates to a kind of anti-scraping coating of environmental protection resistance and fingerprint resistance and its application methods.The anti-scraping coating of the environmental protection resistance and fingerprint resistance includes following component by mass percentage：Aqueous polyurethane 5~90%, organosilicon-modified acrylic 5~90%, pH adjusting agent 0.1~1%, moistening flatting agent 0.1~0.8%, antifoaming agent 0.1~1%, curing agent 1~5%, cosolvent 1~40%.The coating of the present invention has the advantages that fluorin environment protection, surface gloss are low, permeability is excellent, anti-finger printing and scratch resistant property are good, simple for process, widely applicable to plastic film substrate.

Description

An environmentally friendly anti-fingerprint anti-scratch coating and its application method

technical field

The invention relates to the field of coatings, in particular to an environment-friendly anti-fingerprint anti-scratch coating and its application method.

Background technique

When consumers purchase contact products, they often leave fingerprints and other stains and slight scratches on the packaging, which seriously affects the appearance of the product. With the popularization of 3C electronic products and the upgrading of consumption in our country, the industry has put forward requirements on the packaging materials of products. Higher performance requirements such as fingerprint resistance and scratch resistance. The anti-fingerprint and anti-scratch coating is a coating composed of organic polymers, which mainly has the characteristics of hydrophobic, oleophobic, and anti-scratch. At present, the anti-fingerprint performance is mainly achieved in two ways: first, the use of low surface energy chemical materials, currently the best is organic fluorine substances, but the potential toxicity and high price of fluorine-containing components in the system have seriously affected its use in daily necessities. application in the package. 2. Use the physical structure to imitate the lotus leaf effect, but this structure often has problems such as difficult manufacturing and processing, lack of durability and poor transparency. In recent years, the one-component waterborne polyurethane self-dulling resin has attracted the attention of the coating industry due to its excellent properties such as matteness and permeability. However, current water-based self-dulling resins generally have defects such as insufficient film-forming properties and poor scratch resistance.

Contents of the invention

Based on this, the object of the present invention is to provide an environmentally friendly anti-fingerprint anti-scratch coating, which has good matte effect, permeability, anti-fingerprint and anti-scratch properties.

Another object of the present invention is to provide a method for using an environmentally friendly anti-fingerprint anti-scratch coating, which has the advantages of simplicity, good adhesion to various substrates, and wide applicability.

The object of the present invention is achieved through the following technical solutions: an environmentally friendly anti-fingerprint anti-scratch coating, which includes the following components in terms of mass percentage: 5-90% of water-based polyurethane, 5-90% of silicone-modified acrylic acid, pH adjustment 0.1-1% of agent, 0.1-0.8% of wetting and leveling agent, 0.1-1% of defoamer, 1-5% of curing agent, and 1-40% of co-solvent.

The main component of human finger sweat is water, accounting for about 98% of the total composition. Human finger sweat also includes a small amount of urea and oil, accounting for about 1-2% of the total composition. Among them, the oil composition is mainly composed of 40% triglycerides (triglycerides), 25% monofat wax (wax monoesters), 15% free fatty acids (free fatty acids), 12% squalene (squalene) and 7% other substances, These are very easy to leave fingerprints on the surface of the product. In order to achieve the purpose of fingerprint resistance, the surface of the product must be hydrophobic and oleophobic.

The surface energy of the product surface is the key factor determining the fingerprint resistance. The surface energy of water (γ _w ) is 72mN/m, and the surface energy of most oils (γ _l ) is 20-40mN/m. When the surface energy of the prepared product is When (γ _a ) is lower than the surface energy of sweat (γ _s ), the sweat on the surface of the finger will not easily adhere to the surface of the product, thereby achieving the effect of fingerprint resistance. Currently commonly used low surface energy materials are organosilicon and organofluorine. The surface energy of the organic fluorine-CF3 group is as small as 10mN/m, which is the anti-fingerprint material with the lowest surface energy at present, but the potential toxicity and high price of the fluorine-containing components in the system seriously affect its application in daily necessities packaging . Silicone resin is a high polymer with Si-O-Si structure in the molecular chain and organic groups connected to the silicon atom. The electronegativity of the silicon atom is low, and the Si-O-Si bond energy and bond angle are larger than the CC bond. , the molecular chain has high flexibility, and this special valence bond structure makes it have many excellent physical and chemical properties different from carbon-based polymers, such as high temperature resistance, wear resistance, corrosion resistance, small surface energy, and strong film-forming ability The surface energy of silicone-modified acrylic coating film is about 23mN/m, and silicone-based substances do not have the problem of release loss of toxic substances, and have good anti-fouling effect.

For a hydrophobic solid surface, the contact angle between the product surface and water is not only related to the surface energy but also related to the surface roughness. When there are tiny protrusions on the surface, some air will be "closed" between the water and the solid surface During this period, most of the small water droplets are in contact with the air, and the direct contact area with the solid is greatly reduced. Due to the surface tension of the water, the water shrinks on this rough surface, so that the surface has the ability to resist pollution. After the water-based polyurethane film is formed, it has a concave-convex microsphere structure on the surface of the material, which can make the incident light diffusely reflect, so as to achieve the effect of self-extinction, and the research found that when the depth of the surface depression is relatively larger than the papillae of the finger epidermis When the height of the line is high, when the finger touches the surface of the coating and interacts, it will only leave a less clear fingerprint shape on the concave part of the surface, greatly reducing the traces and retention time of fingerprints.

Compared with the prior art, the present invention combines silicone-modified acrylic acid with water-based polyurethane components to uniformly coat the surface of water-based polyurethane microspheres with low surface energy silicone-modified The chemical anti-fouling effect of the substance and the physical anti-fouling effect of the concave-convex structure work synergistically, and cooperate with the pH regulator, wetting and leveling agent, defoamer, curing agent and co-solvent components to reasonably adjust the distribution ratio of each component. Thus, while maintaining the good printability of the coating, the coating has good permeability (light transmittance greater than 90%), good matte effect (glossiness<2.5 at 60°), good scratch resistance ( After rubbing 1000 times under the pressure of 1000g counterweight, there is only a slight change in gloss, and the change in gloss at 60° is <0.5, and the scratches disappear completely after a period of time) and good fingerprint resistance.

Further, the environmentally friendly anti-fingerprint anti-scratch coating includes the following components by mass percentage: 50-90% of water-based polyurethane, 5-40% of silicone-modified acrylic acid, 0.1-1% of pH regulator, and wetting and leveling 0.5-0.8% of antifoaming agent, 0.4-0.8% of defoaming agent, 1-5% of curing agent, and 2-40% of co-solvent.

Further, the particle size of the polyurethane microspheres in the water-based polyurethane is 700nm-10μm. Preferably, the water-based polyurethane is the water-based polyurethane dispersion. Within the particle size range, the water-based polyurethane dispersion has a concave-convex and alternate micro-nano microsphere structure on the surface of the material after film formation, so that the depth of the surface depression is It is relatively higher than the height of the papillae on the surface of the finger, thereby weakening the fingerprint marks left when the finger touches the surface of the coating and improving the fingerprint resistance of the coating.

Further, the water-based polyurethane is one or both of polycarbonate polyurethane and polyester polyurethane. Preferably, the polycarbonate polyurethane is aliphatic polycarbonate polyurethane. The molecular structure of aliphatic polycarbonate or polyester endows the coating with excellent wear resistance, suitable hardness and good permeability. Compared with other self-dulling polyurethanes, the molecular chain of polycarbonate structure contains -[ORO-CO]-structure, the phenylene group and ester group in the molecular chain make the molecular chain a rigid chain, and the glass transition temperature (T _g ) up to 150°C, which makes it have excellent mechanical properties. At the same time, the urea group (-NHCONH-, cohesive energy > 36.5kJ/mol) and urethane group (-NHCOO-, cohesive energy 36.4kJ/mol) in the polyurethane structure mol) has high cohesive energy, is not easy to break after film formation, and has good adhesion to the substrate, so that the formed coating has excellent wear resistance and scratch resistance.

Further, the minimum film-forming temperature of the silicone-modified acrylic acid is <10°C, and the glass transition temperature is <10°C. Preferably, the silicone-modified acrylic is a silicone-modified acrylic emulsion.

Further, the silicone-modified acrylic acid is silicone-modified self-crosslinking acrylic acid. When self-crosslinking acrylic acid is formed into a film, the polymer chains can self-crosslink into a network structure of acrylic acid, which can improve the mechanical strength of the polymer.

Further, the organosilicon modifier in the organosilicon-modified acrylic acid is a silicon-containing vinyl compound, which includes vinylalkyltrichlorosilane, vinylalkylmethoxysilane, vinylalkylethoxy One or more of silane, vinyl alkyl propoxy silane, vinyl alkyl polysiloxane. The silicon-containing vinyl compound is used as a modifier, which is inserted into the self-crosslinking acrylic polymer through free radical polymerization, so that the polymer has a lower surface energy.

Further, the pH regulator is one or more of ammonia water, triethylamine, triethanolamine, N,N-dimethylethanolamine, and AMP-95. The AMP-95 is 2-amino-2-methyl-1-propanol containing 5% water. Using the above-mentioned substances as pH regulators can adjust the acidity of the coating, and cooperate with water-based polyurethane and silicone-modified acrylic to improve the viscosity and film-forming properties of the coating.

Further, the wetting and leveling agent is one or both of organosilicon compounds and acetylene glycol ethoxylates. Using the above-mentioned substances as wetting and leveling agents can reduce the surface tension of the coating, and work synergistically with water-based polyurethane and silicone-modified acrylic to improve the smoothness and uniformity of the coating.

Further, the defoamer is one or both of organosilicon compounds and acetylene glycol ethoxylates. Using the above-mentioned substance as a defoamer can reduce the surface tension of the coating, inhibit foam generation, and cooperate with water-based polyurethane and silicone-modified acrylic acid to improve the smoothness and uniformity of the coating.

Further, the curing agent is a compound that reacts chemically to carboxyl, hydroxyl, and ketone carbonyl, including one or more of isocyanate compounds, adipic acid dihydrazide, aziridine compounds, and carbodiimide compounds. kind. Using the above-mentioned substances as curing agents can promote the polymerization reaction and synergize with water-based polyurethane and silicone-modified acrylic acid to improve the hardness and adhesion of the coating.

Further, the co-solvent includes ethanol, ethylene glycol, isopropanol, N-methylpyrrolidone, N-ethylpyrrolidone, ethylene glycol butyl ether, diethylene glycol butyl ether, propylene glycol butyl ether acetate, One or more of diethylene glycol ether and diethylene glycol ether acetate. The above-mentioned substances are used as co-solvents to work synergistically with water-based polyurethane and silicone-modified acrylic acid to improve solubility.

The present invention also provides a method for using an environmentally friendly anti-fingerprint anti-scratch coating, comprising the following steps:

S1: Mix the components according to the mass percentages described in the present invention to prepare an aqueous coating dispersion;

S2: coating the aqueous coating dispersion onto a substrate;

S3: Pre-baking the coating after being applied to the substrate at a temperature of 60-110°C for 40s-5 minutes;

S4: Curing the pre-baked coating at a temperature of 45-130° C. for 1 hour to 5 days, so as to obtain an environmentally friendly anti-fingerprint and anti-scratch film.

Compared with the prior art, the coating of the present invention satisfies mature industrial processes such as traditional roller coating, spray coating, scraping coating, etc., and the method of use is simple and easy; and, the coating of the present invention is suitable for polypropylene film (PP), polyester Film (PET), polyvinyl chloride film (PVC), polycarbonate film (PC) and other film substrates have good adhesion on various substrates, wide applicability, strong practicability and Commercial prospects; in addition, the coating of the present invention has no fluorine, no volatile organic compound (VOC) emission, no peculiar smell, and is environmentally friendly.

For better understanding and implementation, the present invention will be described in detail below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a structural schematic diagram of an environmentally friendly anti-fingerprint anti-scratch film prepared by the present invention.

Figure 2 is a comparison test chart of the fingerprint resistance of the environmentally friendly anti-fingerprint anti-scratch film prepared in Example 1 and the ordinary matte film.

Detailed ways

The environmental-friendly anti-fingerprint anti-scratch coating of the present invention comprises the following components in terms of mass percentage: 5-90% of water-based polyurethane, 5-90% of silicone-modified acrylic acid, 0.1-1% of pH regulator, and wetting and leveling agent 0.1-0.8%, defoamer 0.1-1%, curing agent 1-5%, co-solvent 1-40%.

As a further optimization, the environment-friendly anti-fingerprint anti-scratch coating includes the following components by mass percentage: 50-90% of water-based polyurethane, 5-40% of silicone-modified acrylic acid, 0.1-1% of pH regulator, wetting Leveling agent 0.5-0.8%, defoamer 0.4-0.8%, curing agent 1-5%, co-solvent 2-40%.

Specifically, the water-based polyurethane is a water-based self-dulling polyurethane dispersion, preferably one or both of aliphatic polycarbonate polyurethane and polyester polyurethane, wherein the polyurethane microspheres have a particle size of 700 nm to 10 μm.

Specifically, the silicone-modified acrylic acid is a silicone-modified acrylic emulsion, preferably a silicone-modified self-crosslinking acrylic emulsion, with a minimum film-forming temperature of <10°C and a glass transition temperature of <10°C. Silicon modifiers are silicon-containing vinyl compounds, including vinylalkyltrichlorosilane, vinylalkylmethoxysilane, vinylalkylethoxysilane, vinylalkylpropoxysilane, vinylalkane One or more of polysiloxanes.

Specifically, the pH regulator is one or more of ammonia water, triethylamine, triethanolamine, N,N-dimethylethanolamine, and AMP-95. The wetting and leveling agent is one or two of organosilicon compounds and acetylene glycol ethoxylates. The defoamer is one or two of organosilicon compounds and acetylene glycol ethoxylates. The curing agent is a compound that reacts to carboxyl, hydroxyl, and ketone carbonyl, including one or more of isocyanate compounds, adipic acid dihydrazide, aziridine compounds, and carbodiimide compounds. Described cosolvent comprises ethanol, ethylene glycol, isopropanol, N-methylpyrrolidone, N-ethylpyrrolidone, ethylene glycol butyl ether, diethylene glycol butyl ether, propylene glycol butyl ether acetate, diethylene glycol One or more of alcohol ethyl ether and diethylene glycol ether acetate.

A method for using an environmentally friendly anti-fingerprint anti-scratch coating of the present invention comprises the following steps:

(1) Mix the components of the coating according to the mass percentages described in the present invention to prepare an aqueous coating dispersion. Specifically, the components of the coating are added and mixed in the order of water-based polyurethane, silicone-modified acrylic acid, pH regulator, wetting and leveling agent, defoamer, curing agent, and co-solvent.

(2) Coating the aqueous coating dispersion obtained in step (1) onto a substrate. Specifically, the aqueous dispersion of the coating is transferred to the substrate by a roller coating process, wherein the coating roller is a chrome-plated steel anilox roller, and the substrate is one of PP, PET, PVC, and PC films.

(3) Perform pre-baking at a temperature of 60-110° C. for 40 seconds to 5 minutes on the coating applied to the substrate.

(4) Curing the prebaked surface-dried coating at a temperature of 45-130° C. for 1 hour to 5 days, so as to form a cross-linked film and obtain an environmentally friendly anti-fingerprint and anti-scratch film.

Please refer to FIG. 1 , which is a structural schematic diagram of an environmentally friendly anti-fingerprint anti-scratch film prepared by the present invention, including a substrate 1 and an environmentally friendly anti-fingerprint anti-scratch coating 2 coated on the substrate 1 .

The present invention will be further described in detail below in conjunction with the examples, tests and drawings, but the embodiments of the present invention are not limited thereto.

Example 1

At a stirring speed of 600-1000rpm, according to the following parts by mass, each component was added in order to prepare an environmentally friendly fingerprint-resistant and anti-scratch coating water dispersion: 67 parts of water-based polyurethane dispersion, 20 parts of silicone modified acrylic emulsion, 0.5 parts of pH regulator, 0.8 parts of wetting and leveling agent, 0.7 parts of defoamer, 2.2 parts of curing agent, and 10 parts of co-solvent.

Adopt the method for scraper roll coating to coat the above-mentioned prepared environmental protection anti-fingerprint anti-scratch coating water dispersion on the surface of biaxially oriented polypropylene film (BOPP); pre-baking the coating after coating to BOPP, the pre-baking temperature The temperature is 70°C, and the time is 60s; the pre-dried coating is cured at 50°C, and the time is 2d to form an environmentally friendly anti-fingerprint and anti-scratch film.

Example 2

At a stirring speed of 800-1000rpm, according to the following parts by mass, each component was added in order to prepare an environmentally friendly fingerprint-resistant and scratch-resistant coating water dispersion: 70 parts of water-based polyurethane dispersion, 15 parts of silicone modified acrylic emulsion, 0.3 parts of pH regulator, 0.8 parts of wetting and leveling agent, 0.4 parts of defoamer, 2.5 parts of curing agent, 6 parts of co-solvent.

Adopt the method for scraper roll coating to apply the above-mentioned environmental protection anti-fingerprint anti-scratch coating water dispersion on the surface of biaxially stretched polyester film (BOPET); pre-baking the coating after coating to BOPET, the pre-baking temperature The temperature is 110°C, and the time is 40s; the pre-dried coating is cured at 60°C, and the time is 1d to form an environmentally friendly anti-fingerprint and anti-scratch film.

Example 3

At a stirring speed of 700-800rpm, add the components in sequence according to the following parts by mass to prepare an aqueous dispersion of an environmentally friendly fingerprint-resistant and scratch-resistant coating: 75 parts of water-based polyurethane dispersion, 15 parts of silicone-modified acrylic emulsion, 0.4 parts of pH regulator, 0.9 parts of wetting and leveling agent, 0.8 parts of defoamer, 2.7 parts of curing agent, 6 parts of cosolvent.

Adopt the method for scraper roll coating to apply the above-mentioned environmental protection anti-fingerprint anti-scratch coating water dispersion on the surface of biaxially stretched polyester film (BOPET); pre-baking the coating after coating to BOPET, the pre-baking temperature at 100°C for 50s; to cure the surface-dried coating at a temperature of 45°C for 2 days to form an environmentally friendly anti-fingerprint and anti-scratch film.

test

The performance test was carried out on the environment-friendly anti-fingerprint anti-scratch coating of Examples 1-3, and the test results are shown in Table 1.

The performance test result of the environmental protection anti-fingerprint anti-scratch coating of table 1 embodiment 1-3

Test items standard Example 1 Example 2 Example 3 Viscosity (mPa·s) - 380 365 385 Solid content (%) GB/T1725 31 30 30 pH GB/T 8325 8.0 8.5 8.0

Performance tests were performed on the environmental-friendly anti-fingerprint and anti-scratch films of Examples 1-3, and the test results are shown in Table 2.

The performance test result of the environmental protection anti-fingerprint anti-scratch film of table 2 embodiment 1-3

Test items standard Example 1 Example 2 Example 3 Transmittance(%) GB/T2410 90.0 90.5 90.1 Haze (%) GB/T2410 85.0 86.1 85.1 Gloss (60°) GB/T8807 1.9 2.0 1.7 Scratch resistance (times/1000g) - 1000 1000 1000

Among them, the scratch resistance test is as follows: use the ZJ-339 rubber alcohol abrasion tester, use self-locking cable ties to fix four layers of dust-free cloth on a section of the friction hammer with a diameter of 10mm, and use a rate of about 30mm/s The speed is linear reciprocating friction in the same area on the surface of the anti-scratch film, and one back and forth is one time. After rubbing 1000 times under the pressure of 1000g counterweight weight, the surface of the anti-scratch film has only a slight change in gloss (60°, gloss change <0.5), and the scratches completely disappeared after being placed at room temperature for 5 hours, indicating that the coating prepared by the present invention has excellent scratch resistance.

Other performance tests of the present invention are carried out according to national or industry standards. It can be seen from the test results in the table that the environmental protection anti-fingerprint anti-scratch film of the present invention also has good permeability (light transmittance greater than 90%) and good matte effect (glossiness<2.5 at 60°).

In addition, the fingerprint resistance test was carried out on the environmental-friendly anti-fingerprint anti-scratch film of Example 1, and the fingerprint liquid was pressed on the surface of the film with a finger, and a visual evaluation was made. The test results are shown in Figure 2. Among them, A is the state of fingerprints on the surface of the ordinary matte film, and B is the state of fingerprints on the surface of the film of Example 1 of the present invention. It can be seen that compared with ordinary films, the traces of fingerprints left on the surface of the film of Example 1 of the present invention Very shallow, indicating that the coating prepared by the present invention has good fingerprint resistance.

Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention combines the chemical anti-fouling effect of the low surface energy polymer and the physical anti-fouling effect of the micro-nano level concave-convex structure, while maintaining the good printability of the coating At the same time, it has excellent fingerprint resistance and scratch resistance. (2) The present invention overcomes the coating permeability problem caused by the rough surface structure, ensures that the printed matter after packaging and lamination has no blind spot loss, good color reproduction, and at the same time has a matte effect, good fingerprint resistance and excellent scratch resistance The high performance makes the coating have a certain application prospect in the field of high-grade packaging printing coating. (3) The coating of the present invention has the advantages of being water-based, fluorine-free, VOC-free, without any peculiar smell, and environmentally friendly. (4) The coating of the present invention satisfies mature industrial processes such as traditional roller coating, spray coating, scraping coating, etc., and the method of use is simple and easy, and the coating of the present invention can be used for multiple film substrates of PP, PET, PVC, PC, It has good adhesion on various substrates and has wide applicability.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims (10)

1. An environment-friendly anti-fingerprint anti-scratch coating is characterized in that: it comprises the following components by mass percentage: 5-90% of water-based polyurethane, 5-90% of organosilicon-modified acrylic acid, 0.1-1% of pH regulator, Wetting and leveling agent 0.1-0.8%, defoamer 0.1-1%, curing agent 1-5%, co-solvent 1-40%. 2. The environment-friendly anti-fingerprint anti-scratch coating according to claim 1, characterized in that: the particle size of the polyurethane microspheres in the water-based polyurethane is 700nm-10μm. 3. The environment-friendly anti-fingerprint and anti-scratch coating according to claim 1, characterized in that: the water-based polyurethane is one or both of polycarbonate polyurethane and polyester polyurethane. 4. The environmentally friendly anti-fingerprint and anti-scratch coating according to claim 1, characterized in that: the minimum film-forming temperature of the silicone-modified acrylic acid is <10°C, and the glass transition temperature is <10°C. 5. The environment-friendly anti-fingerprint anti-scratch coating according to claim 1, characterized in that: the organosilicon-modified acrylic acid is organosilicon-modified self-crosslinking acrylic acid. 6. The environment-friendly anti-fingerprint anti-scratch coating according to claim 1, characterized in that: the organosilicon modifier in the organosilicon-modified acrylic acid is a silicon-containing vinyl compound, which includes vinyl alkyl trichloride One or more of silane, vinylalkylmethoxysilane, vinylalkylethoxysilane, vinylalkylpropoxysilane, vinylalkylpolysiloxane. 7. The environment-friendly anti-fingerprint anti-scratch coating according to any one of claims 1-6, characterized in that: the pH regulator is ammonia water, triethylamine, triethanolamine, N,N-dimethylethanolamine, AMP One or more of -95. 8. The environmentally friendly anti-fingerprint anti-scratch coating according to any one of claims 1-6, characterized in that: the wetting and leveling agent is one of organic silicon compounds, acetylene glycol ethoxylates or Two kinds; the defoamer is one or two of organosilicon compounds and acetylene glycol ethoxylates. 9. The environmental protection anti-fingerprint anti-scratch coating according to any one of claims 1-6, characterized in that: the curing agent is a compound that reacts chemically to carboxyl, hydroxyl, and ketone carbonyl, and it includes isocyanate compounds, hexyl One or more of diacid dihydrazides, aziridine compounds, and carbodiimide compounds; the cosolvents include ethanol, ethylene glycol, isopropanol, N-methylpyrrolidone, N-ethyl One or more of pyrrolidone, ethylene glycol butyl ether, diethylene glycol butyl ether, propylene glycol butyl ether acetate, diethylene glycol ethyl ether, diethylene glycol ethyl ether acetate. 10. A method for using an environmentally friendly anti-fingerprint anti-scratch coating, characterized in that: comprising the following steps: S1: Mix the components according to the mass percentage of any one of claims 1-6 to prepare an aqueous coating dispersion; S2: coating the aqueous coating dispersion onto a substrate; S3: Pre-baking the coating after being applied to the substrate at a temperature of 60-110°C for 40s-5 minutes; S4: Curing the pre-baked coating at a temperature of 45-130° C. for 1 hour to 5 days, so as to obtain an environmentally friendly anti-fingerprint and anti-scratch film.