A wear-resistant acid and alkali resistant UV hardening liquid, a wear-resistant acid and alkali resistant UV hardening film and a preparation method thereof

Abstract

This invention discloses a wear-resistant and acid / alkali-resistant UV curing liquid, a wear-resistant and acid / alkali-resistant UV curing film, and their preparation method, belonging to the field of curing film technology. The curing liquid is composed of high-functionality aliphatic polyurethane acrylic resin, epoxy acrylic resin, butyl rubber, photoinitiator, leveling agent, dispersant, and organic solvent. The curing film preparation method involves coating the curing liquid onto the surface of a PET film, removing the solvent through segmented gradient drying, and then curing it with high-pressure mercury lamp ultraviolet light to form a 1-5 μm thick curing coating, thus obtaining the curing film. This curing film possesses high hardness (up to 6H), strong wear resistance (no scratches after 1000 cycles of friction), excellent acid and alkali resistance (withstands immersion in strong acid at pH 2-3 / strong alkali at pH 12-13 for 6 hours), and good optical properties (transmittance >90%, haze <2%). Furthermore, the coating exhibits strong adhesion (no peeling after boiling in water for 30 minutes following a cross-cut adhesion test). The preparation process is simple and convenient, suitable for various scenarios such as electronic products, home appliances, and outdoor decoration, and can effectively extend the service life of applied products.

Description

Technical Field

[0001] This invention belongs to the field of curing film technology, specifically a wear-resistant and acid / alkali-resistant UV curing liquid, a wear-resistant and acid / alkali-resistant UV curing film, and a method for preparing the same. Background Technology

[0002] With the continuous iteration of electronic technology and the high requirements for product performance in the decoration field, the functional requirements of optical-grade polyester films used on the decorative panels of display devices, equipment and instruments have gradually upgraded from the initial simple protective function to a comprehensive demand for multi-dimensional functions such as high transparency, high hardness, high strength, strong wear resistance, and acid and alkali resistance.

[0003] Optical-grade polyester film, with its excellent processing and forming properties, high light transmittance, and low haze, is widely used in various fields such as electronic products, home appliances, equipment and instruments, and outdoor decoration. However, polyester film itself has inherent shortcomings: insufficient surface abrasion resistance, poor acid and alkali resistance, weak anti-fouling ability, and low hardness. These defects severely limit its application in complex environments or demanding scenarios.

[0004] Currently, the industry commonly uses a functional layer coating on the surface of polyester film for surface treatment to improve its overall performance. Many related technologies have been disclosed. For example, patent application number 201010566198.1, entitled "An Optical Hardening Film," enhances the film's wear resistance and scratch resistance by adding inorganic nanoparticles. However, the introduction of inorganic nanoparticles significantly negatively impacts the optical properties of the polyester film, such as light transmittance and haze, making it impossible to simultaneously achieve "improved wear resistance" and "maintained optical performance." Another example is patent application number 201210430074.X, entitled "An Antistatic Transparent Hardening Film," which uses metal oxides added to the hardening layer to achieve antistatic functionality. However, metal oxides are sensitive to acidic and alkaline environments and are prone to oxidation and discoloration, which reduces the film's acid and alkali resistance, resulting in a conflict between "achieving antistatic functionality" and "ensuring acid and alkali resistance." Conflicts; for example, the patent with application number CN201710026581.X, entitled "A UV curing liquid for PET electronic film and its preparation method and application", although it improved the shortcomings of solvent-based UV curing coatings by optimizing the preparation process and obtained products with excellent optical performance, did not solve the problem of achieving the standard for wear resistance and acid and alkali resistance in a coordinated manner.

[0005] Furthermore, while optical-grade polyester films have a wide range of applications, their direct use is relatively limited; most require surface treatments such as primer coating and adhesive application before use. In existing technologies, improving a single property (such as simply increasing hardness or optimizing light transmittance) is relatively easy. However, simultaneously meeting the requirements for multiple core properties, including abrasion resistance, optical properties, mechanical properties, and acid and alkali resistance, is extremely difficult. Improving abrasion resistance often leads to a decrease in optical performance or insufficient mechanical toughness, while strengthening acid and alkali resistance may affect adhesion or hardness. These interrelationships between properties have become a technological bottleneck in the industry. Summary of the Invention

[0006] The purpose of this invention is to provide a wear-resistant and acid / alkali-resistant UV curing liquid, a wear-resistant and acid / alkali-resistant UV curing film, and a method for preparing the same. This invention addresses the technical bottleneck in existing technologies where improving a single property of the curing film can lead to a decline in other properties. It achieves a synergistic balance of high hardness, strong wear resistance, excellent acid and alkali resistance, good optical properties, and high adhesion. The prepared curing liquid can be widely adapted to the protection needs of various scenarios such as electronic products, home appliances, equipment and instrument decorative panels, and outdoor decoration, thus extending the service life of the applied products.

[0007] The objective of this invention is achieved through the following technical solution: A wear-resistant, acid and alkali resistant UV curing liquid, composed of the following components in parts by weight: 10-30 parts by weight of high-functional aliphatic polyurethane acrylic resin, 10-20 parts by weight of epoxy acrylic resin, 3-15 parts by weight of butyl rubber, 2-10 parts by weight of photoinitiator, 0.5-2 parts by weight of leveling agent, 0.1-0.5 parts by weight of dispersant, and 50-100 parts by weight of organic solvent. The high-functionality aliphatic polyurethane acrylate resin is a polyurethane acrylate resin or a hexafunctional polyurethane acrylate, wherein in the high-functionality aliphatic, the number of functional groups in the acrylate double bond is 4-16.

[0008] As some possible embodiments of this application, the photoinitiator is selected from one or more of 1-hydroxy-cyclohexylbenzophenone (184) and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO).

[0009] As some possible embodiments of this application, the leveling agent is an acrylate or modified polysiloxane compound.

[0010] As some possible embodiments of this application, the dispersant is selected from one or more of triethylhexylphosphate, sodium dodecyl sulfate, and methylpentanol.

[0011] As some possible embodiments of this application, the organic solvent is selected from one or more of ethyl acetate, butanone, cyclohexanone, toluene, methyl isobutyl ketone, butyl acetate, and methyl ethyl ketone.

[0012] As some possible embodiments of this application, the viscosity of the hardening liquid is 50-120 cps at 25°C.

[0013] In addition, to achieve the above objectives, this application also provides a method for preparing a wear-resistant, acid and alkali resistant, and UV-curable film, comprising the following steps: a. Prepare the hardening solution; b. Preparation of wear-resistant, acid and alkali resistant UV curing film: Take a PET film, coat one or both sides of it with a layer of curing liquid, and then dry and irradiate with ultraviolet light to form a dense curing coating on the surface of the PET film, thus obtaining a wear-resistant, acid and alkali resistant UV curing film.

[0014] As one possible implementation of this application, in step b, the drying step uses an oven drying process, and the oven uses segmented temperature control, as detailed below: The temperature range for the first segment is 60–70℃; the second segment is 70–80℃; the third segment is 90–100℃; the fourth segment is 110–120℃; the fifth segment is 120–130℃; the sixth segment is 120–130℃; the seventh segment is 100–110℃; and the eighth segment is 70–80℃. During drying, the PET film coated with the curing solution passes through the oven at a linear speed of 30–80 m / min.

[0015] As one possible implementation method of this application, in step b, the ultraviolet light irradiation source is a high-pressure mercury lamp (160W / cm), and its curing irradiation energy is 340 mJ / cm. 2 ~600mJ / cm 2, The irradiation time is 30s to 120s.

[0016] As one possible implementation of this application, in step b, the thickness of the hardened coating is 1–5 μm.

[0017] Furthermore, in order to achieve the above objectives, this application also provides a wear-resistant, acid and alkali resistant, UV-curable film, which is prepared by any one of the above-mentioned methods.

[0018] Compared with the prior art, the beneficial effects of the present invention are: This invention, through the rational selection of the types and functionalities of high-functionality aliphatic polyurethane acrylic resin, epoxy acrylic resin, and butyl rubber, and their mixing in appropriate proportions, combined with photoinitiators, leveling agents, dispersants, and organic solvents, prepares a wear-resistant and acid / alkali-resistant UV-curing liquid. This liquid is then coated to form a UV-cured film. This process not only achieves synergistic improvements in multiple performance aspects but also features simple and easy preparation, making it well-suited for practical application needs. Specifically: The hardness of the hardened coating on the surface of the hardened film can reach 6H (referring to the test method for hardness determination by pencil method in GB / T 6739-2006), and it can pass 1000 cycles of surface abrasion resistance test (using #0000 steel wool balls for back-and-forth friction, with a load of 500g / cm², a friction distance of 5-6cm, and 50 cycles / min). After the test, the coating surface is free of scratches. The obtained wear-resistant, acid and alkali resistant UV hardened film has good acid and alkali resistance, and can pass the tests of strong acids with a pH of 2-3 and strong alkalis with a pH of 12-13 (referring to the test method for acid and alkali resistance in GB / T 18724-2008). At the same time, the adhesion of the hardened coating to the PET surface is stable, passing the cross-cut adhesion test (referring to the cross-cut test method for paint and varnish films in GB / T 9286-1998) and then being boiled in water for 30 minutes. There was no peeling, and the adhesion met the 100 / 100 standard, which can reduce the peeling of the hardened layer and the corrosion of the PET surface caused by acid and alkali immersion during application. The optical properties of the hardened film are also well preserved, with a light transmittance of over 90% and a haze of less than 2% (tested with a WGT-S light transmittance / haze tester, referring to the experimental method of light transmittance and haze of transparent plastics in CB2410-80). It can meet the transparency requirements of relevant scenarios. In summary, this invention effectively improves the common problem in the prior art that "improvement of a single performance can easily lead to a decline in other performances", avoids the adverse effects on optical performance when adding inorganic nanoparticles to enhance wear resistance, and also alleviates the situation of decreased acid and alkali resistance and easy oxidation and discoloration when adding metal oxides to achieve antistatic function. It provides a feasible solution for the application of hardened films that need to take into account multiple performance aspects at the same time. Detailed Implementation

[0019] Example 1: A method for preparing a wear-resistant, acid and alkali resistant, and UV-curable film includes the following steps: a. Preparation of curing liquid: 20 parts by mass of high-functional aliphatic polyurethane acrylic resin (polyurethane acrylic resin, commercially available), 20 parts by mass of epoxy acrylic resin, 10 parts by mass of butyl rubber, 6 parts by mass of photoinitiator [1-hydroxy-cyclohexylbenzophenone (184): 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) in a 1:1 mass ratio], 1 part by mass of leveling agent (acrylate leveling agent BYK-358N), 0.4 parts by mass of dispersant (sodium dodecyl sulfate), 80 parts by mass of ethyl acetate. After mixing evenly, the curing liquid is obtained. The viscosity of the curing liquid is 80 cps (at 25℃). b. Preparation of wear-resistant and acid / alkali-resistant hardened film: The above-mentioned hardening solution is uniformly coated onto one side of the optical-grade PET film through a slit coating method. It is then dried in an oven at a speed of 40 m / min. The drying temperatures in the oven are: Section 1 60℃; Section 2 75℃; Section 3 95℃; Section 4 115℃; Section 5 125℃; Section 6 125℃; Section 7 110℃; Section 8 75℃. After drying the solvent, the film is irradiated with a high-pressure mercury lamp (160 W / cm²) at an energy of 600 mJ / cm². 2 Under certain conditions, the hardened layer is cured for 40 seconds to form a dense hardened layer with a thickness of 2μm, thus obtaining a wear-resistant and acid-alkali-resistant hardened film.

[0020] Example 2: A method for preparing a wear-resistant, acid and alkali resistant, and UV-curable film includes the following steps: a. Preparation of curing liquid: 20 parts by mass of high-functional aliphatic polyurethane acrylic resin (polyurethane acrylic resin), 20 parts by mass of epoxy acrylic resin, 10 parts by mass of butyl rubber, 6 parts by mass of photoinitiator [1-hydroxy-cyclohexylbenzophenone (184): 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) in a 1:1 mass ratio], 1 part by mass of leveling agent (acrylate leveling agent BYK-358N), 0.4 parts by mass of dispersant (sodium dodecyl sulfate), 80 parts by mass of ethyl acetate. After mixing evenly, the curing liquid is obtained. The viscosity of the curing liquid is 80 cps (25℃). b. Preparation of wear-resistant and acid / alkali-resistant hardened film: The above-mentioned hardening solution is uniformly coated onto one side of the optical-grade PET film through a slit coating method. It is then dried in an oven at a speed of 40 m / min. The drying temperatures in the oven are: Section 1 60℃; Section 2 75℃; Section 3 95℃; Section 4 115℃; Section 5 125℃; Section 6 125℃; Section 7 110℃; Section 8 75℃. After drying the solvent, the film is irradiated with a high-pressure mercury lamp (160 W / cm²) at an energy of 600 mJ / cm². 2 Under certain conditions, the hardened layer is cured for 40 seconds to form a dense hardened layer with a thickness of 4μm, thus obtaining a wear-resistant and acid-alkali-resistant hardened film.

[0021] Example 3: A method for preparing a wear-resistant, acid and alkali resistant, and UV-curable film includes the following steps: a. Preparation of curing liquid: 25 parts by mass of high-functional aliphatic polyurethane acrylic resin (hexafunctional polyurethane acrylate, commercially available), 20 parts by mass of epoxy acrylic resin, 8 parts by mass of butyl rubber, 6 parts by mass of photoinitiator [1-hydroxy-cyclohexylbenzophenone (184): 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) in a 1:1 mass ratio], 1.5 parts by mass of leveling agent (acrylate leveling agent BYK-358N), 0.3 parts by mass of dispersant, 80 parts by mass of ethyl acetate. After mixing evenly, the curing liquid is obtained. The viscosity of the curing liquid is 85 cps (at 25℃). b. Preparation of wear-resistant and acid / alkali-resistant hardened film: The above-mentioned hardening solution is uniformly coated onto one side of the optical-grade PET film through a slit coating method. It is then dried in an oven at a speed of 40 m / min. The drying temperatures in the oven are: Section 1 60℃; Section 2 75℃; Section 3 95℃; Section 4 115℃; Section 5 125℃; Section 6 125℃; Section 7 110℃; Section 8 75℃. After drying the solvent, the film is irradiated with a high-pressure mercury lamp (160 W / cm²) at an energy of 600 mJ / cm². 2 Under certain conditions, the hardened layer is cured for 40 seconds to form a dense hardened layer with a thickness of 2μm, thus obtaining a wear-resistant and acid-alkali-resistant hardened film.

[0022] Example 4: A method for preparing a wear-resistant, acid and alkali resistant, and UV-curable film includes the following steps: a. Preparation of the curing liquid: 25 parts by mass of high-functional aliphatic polyurethane acrylic resin, hexafunctional polyurethane acrylate, 20 parts by mass of epoxy acrylic resin, 8 parts by mass of butyl rubber, 6 parts by mass of photoinitiator [1-hydroxy-cyclohexylbenzophenone (184): 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) in a 1:1 mass ratio], 1.5 parts by mass of leveling agent (acrylate leveling agent BYK-358N), 0.3 parts by mass of dispersant (sodium dodecyl sulfate), 80 parts by mass of ethyl acetate. After mixing evenly, the curing liquid is obtained. The viscosity of the curing liquid is 85 cps (at 25°C). b. Preparation of wear-resistant and acid / alkali-resistant hardened film: The above-mentioned hardening solution is uniformly coated onto one side of the optical-grade PET film through a slit coating method. It is then dried in an oven at a speed of 40 m / min. The drying temperatures in the oven are: Section 1 60℃; Section 2 75℃; Section 3 95℃; Section 4 115℃; Section 5 125℃; Section 6 125℃; Section 7 110℃; Section 8 75℃. After drying the solvent, the film is irradiated with a high-pressure mercury lamp (160 W / cm²) at an energy of 600 mJ / cm². 2 Under certain conditions, the hardened layer is cured for 40 seconds to form a dense hardened layer with a thickness of 4μm, thus obtaining a wear-resistant and acid-alkali-resistant hardened film.

[0023] Example 5: A method for preparing a wear-resistant, acid and alkali resistant, and UV-curable film includes the following steps: a. Preparation of curing liquid: 25 parts by mass of high-functional aliphatic polyurethane acrylic resin (polyurethane acrylic resin), 15 parts by mass of epoxy acrylic resin, 10 parts by mass of butyl rubber, 5 parts by mass of photoinitiator [1-hydroxy-cyclohexylbenzophenone (184): 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) in a ratio of 3:2, by mass], 1.0 parts by mass of leveling agent (acrylate leveling agent BYK-358N), 0.3 parts by mass of dispersant (triethylhexylphosphine), 80 parts by mass of ethyl acetate. After mixing evenly, the curing liquid is obtained. The viscosity of the curing liquid is 65 cps (at 25°C). b. Preparation of wear-resistant and acid / alkali-resistant hardened film: The above-mentioned hardening solution is uniformly coated onto one side of the optical-grade PET film through a slit coating method. It is then dried in an oven at a speed of 40 m / min. The drying temperatures in the oven are: Section 1 60℃; Section 2 75℃; Section 3 95℃; Section 4 115℃; Section 5 125℃; Section 6 125℃; Section 7 110℃; Section 8 75℃. After drying the solvent, the film is irradiated with a high-pressure mercury lamp (160 W / cm²) at an energy of 600 mJ / cm². 2 Under certain conditions, the hardened layer is cured for 40 seconds to form a dense hardened layer with a thickness of 4μm, thus obtaining a wear-resistant and acid-alkali-resistant hardened film.

[0024] Example 6: A method for preparing a wear-resistant, acid and alkali resistant, and UV-curable film includes the following steps: a. Preparation of the curing liquid: 25 parts by mass of high-functional aliphatic polyurethane acrylic resin (hexafunctional polyurethane acrylate), 20 parts by mass of epoxy acrylic resin, 15 parts by mass of butyl rubber, 7 parts by mass of photoinitiator [1-hydroxy-cyclohexylbenzophenone (184): 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) in a ratio of 3:4, by mass], 1.8 parts by mass of leveling agent (acrylate leveling agent BYK-358N), 0.4 parts by mass of dispersant (triethylhexylphosphine), 90 parts by mass of ethyl acetate. After mixing evenly, the curing liquid is obtained. The viscosity of the curing liquid is 100 cps (at 25°C). b. Preparation of wear-resistant and acid / alkali-resistant hardened film: The above-mentioned hardening solution is uniformly coated onto one side of the optical-grade PET film through a slit coating method. It is then dried in an oven at a speed of 40 m / min. The drying temperatures in the oven are: Section 1 60℃; Section 2 75℃; Section 3 95℃; Section 4 115℃; Section 5 125℃; Section 6 125℃; Section 7 110℃; Section 8 75℃. After drying the solvent, the film is irradiated with a high-pressure mercury lamp (160 W / cm²) at an energy of 600 mJ / cm².2 Under certain conditions, the hardened layer is cured for 40 seconds to form a dense hardened layer with a thickness of 4μm, thus obtaining a wear-resistant and acid-alkali-resistant hardened film.

[0025] Example 7: A method for preparing a wear-resistant, acid and alkali resistant, and UV-curable film includes the following steps: a. Preparation of curing liquid: 20 parts by mass of high-functional aliphatic polyurethane acrylic resin (polyurethane acrylic resin), 20 parts by mass of epoxy acrylic resin, 3 parts by mass of butyl rubber, 5 parts by mass of photoinitiator [1-hydroxy-cyclohexylbenzophenone (184): 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) in a ratio of 2:3, by mass], 1.0 parts by mass of leveling agent (acrylate leveling agent BYK-358N), 0.4 parts by mass of dispersant (triethylhexylphosphine), 75 parts by mass of ethyl acetate. After mixing evenly, the curing liquid is obtained. The viscosity of the curing liquid is 82 cps (at 25°C). b. Preparation of wear-resistant and acid / alkali-resistant hardened film: The above-mentioned hardening solution is uniformly coated onto one side of the optical-grade PET film through a slit coating method. It is then dried in an oven at a speed of 40 m / min. The drying temperatures in the oven are: Section 1 60℃; Section 2 75℃; Section 3 95℃; Section 4 115℃; Section 5 125℃; Section 6 125℃; Section 7 110℃; Section 8 75℃. After drying the solvent, the film is irradiated with a high-pressure mercury lamp (160 W / cm²) at an energy of 600 mJ / cm². 2 Under certain conditions, the hardened layer is cured for 40 seconds to form a dense hardened layer with a thickness of 4μm, thus obtaining a wear-resistant and acid-alkali-resistant hardened film.

[0026] Example 8: A method for preparing a wear-resistant, acid and alkali resistant, and UV-curable film includes the following steps: a. Preparation of the curing liquid: 20 parts by mass of high-functional aliphatic polyurethane acrylic resin (hexafunctional polyurethane acrylate), 10 parts by mass of epoxy acrylic resin, 3 parts by mass of butyl rubber, 4 parts by mass of photoinitiator [1-hydroxy-cyclohexylbenzophenone (184): 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) in a 1:1 mass ratio], 0.7 parts by mass of leveling agent (acrylate leveling agent BYK-358N), 0.2 parts by mass of dispersant (methylpentanol), 55 parts by mass of ethyl acetate. After mixing evenly, the curing liquid is obtained. The viscosity of the curing liquid is 60 cps (25℃). b. Preparation of wear-resistant and acid / alkali-resistant hardened film: The above-mentioned hardening solution is uniformly coated onto one side of the optical-grade PET film through a slit coating method. It is then dried in an oven at a speed of 40 m / min. The drying temperatures in the oven are: Section 1 60℃; Section 2 75℃; Section 3 95℃; Section 4 115℃; Section 5 125℃; Section 6 125℃; Section 7 110℃; Section 8 75℃. After drying the solvent, the film is irradiated with a high-pressure mercury lamp (160 W / cm²) at an energy of 600 mJ / cm². 2 Under certain conditions, the hardened layer is cured for 40 seconds to form a dense hardened layer with a thickness of 4μm, thus obtaining a wear-resistant and acid-alkali-resistant hardened film.

[0027] Example 9: A method for preparing a wear-resistant, acid and alkali resistant, and UV-curable film includes the following steps: a. Preparation of curing liquid: 10 parts by mass of high-functional aliphatic polyurethane acrylic resin (polyurethane acrylic resin), 20 parts by mass of epoxy acrylic resin, 10 parts by mass of butyl rubber, 4.2 parts by mass of photoinitiator [1-hydroxy-cyclohexylbenzophenone (184): 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) in a mass ratio of 1.1:1], 1.3 parts by mass of leveling agent (acrylate leveling agent BYK-358N), 0.2 parts by mass of dispersant (methylpentanol), 80 parts by mass of ethyl acetate. After mixing evenly, the curing liquid is obtained. The viscosity of the curing liquid is 63 cps (25℃). b. Preparation of wear-resistant and acid / alkali-resistant hardened film: The above-mentioned hardening solution is uniformly coated onto one side of the optical-grade PET film through a slit coating method. It is then dried in an oven at a speed of 40 m / min. The drying temperatures in the oven are: Section 1 60℃; Section 2 75℃; Section 3 95℃; Section 4 115℃; Section 5 125℃; Section 6 125℃; Section 7 110℃; Section 8 75℃. After drying the solvent, the film is irradiated with a high-pressure mercury lamp (160 W / cm²) at an energy of 600 mJ / cm². 2 Under certain conditions, the hardened layer is cured for 40 seconds to form a dense hardened layer with a thickness of 4μm, thus obtaining a wear-resistant and acid-alkali-resistant hardened film.

[0028] Example 10: A method for preparing a wear-resistant, acid and alkali resistant, and UV-curable film includes the following steps: a. Preparation of the curing liquid: 10 parts by mass of high-functional aliphatic polyurethane acrylic resin (hexafunctional polyurethane acrylate), 20 parts by mass of epoxy acrylic resin, 15 parts by mass of butyl rubber, 6 parts by mass of photoinitiator [1-hydroxy-cyclohexylbenzophenone (184): 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) in a 1:1 mass ratio], 1.1 parts by mass of leveling agent (acrylate leveling agent BYK-358N), 0.3 parts by mass of dispersant (methylpentanol), 90 parts by mass of ethyl acetate. After mixing evenly, the curing liquid is obtained. The viscosity of the curing liquid is 94 cps (at 25℃). b. Preparation of wear-resistant and acid / alkali-resistant hardened film: The above-mentioned hardening solution is uniformly coated onto one side of the optical-grade PET film through a slit coating method. It is then dried in an oven at a speed of 40 m / min. The drying temperatures in the oven are: Section 1 60℃; Section 2 75℃; Section 3 95℃; Section 4 115℃; Section 5 125℃; Section 6 125℃; Section 7 110℃; Section 8 75℃. After drying the solvent, the film is irradiated with a high-pressure mercury lamp (160 W / cm²) at an energy of 600 mJ / cm². 2 Under certain conditions, the hardened layer is cured for 40 seconds to form a dense hardened layer with a thickness of 4μm, thus obtaining a wear-resistant and acid-alkali-resistant hardened film.

[0029] Comparative Examples 5-8: The butyl rubber component in Examples 5-8 was reduced respectively, while the other material ratios and preparation processes remained the same; Experimental Example The relevant properties of the hardened films prepared in the test examples and comparative examples are shown in Tables 1 and 2.

[0030] The relevant testing methods are as follows: (1) Transmittance and haze test: Refer to the experimental method of transmittance and haze of transparent plastics CB2410-80 and use WGT-S transmittance / haze tester for testing.

[0031] (2) Hardness test: Refer to GB / T 6739-2006 Test method for determining the hardness of paint film by pencil method for paint and varnish, and use the highest pencil hardness grade that does not produce scratches or marks to calibrate the hardness of the hardened coating.

[0032] (3) Adhesion test: Refer to GB / T 9286-1998 for the grid test method of paint and varnish film. Passing the test of 100 / 100 is considered qualified.

[0033] (4) Abrasion resistance test: The surface of the hardened film was rubbed back and forth with a #0000 steel wool ball under a load of 500g / cm. 2The friction distance is 5-6cm, and the number of friction cycles is as high as 50 times / min. The surface of the hardened coating is observed for scratches to determine its quality. If there are no scratches or marks, it is considered qualified.

[0034] (5) Acid and alkali resistance test: Refer to GB / T 18724-2008 Acid and alkali resistance test method, use a strong acid solution with a pH value of 2 to 3, or a strong alkali solution with a pH value of 12 to 13, immerse all or most of the hardened film (more than 2 / 3 of the part) in the acid / alkali solution, take it out after soaking for 24 hours, wash it with clean water and let it stand for 30 minutes, observe the appearance of the hardened film. If the appearance is good, there is no delamination or blistering, the light transmittance and haze do not change significantly, and the color of the soaking solution does not change, then it meets the acid and alkali resistance test.

[0035] The acid resistance test has a pH value of 2-3, and the alkali resistance test has a pH value of 12-13. The films are immersed in acid and alkali solutions for 30 minutes, 1 hour, 3 hours, and 6 hours, respectively. A ☆ indicates no residual adhesive, no delamination, and no corrosion on the PET base film surface; a △ indicates no residual adhesive, no delamination, but some corrosion; a ▲ indicates no residual adhesive, some delamination, and some corrosion; and a ★ indicates residual adhesive, delamination, and corrosion.

[0036] Table 1: Table 2: From Table 1 and Table 2, we can see that: 1. Through Examples 5-8 and Comparative Examples 5-8, it can be concluded that the pencil hardness, adhesion and wear resistance of the hardened film after adding butyl rubber are all better than those of the comparative examples without butyl rubber. 2. The acid and alkali resistance of the sample with added butyl rubber is also better than that of the control group without butyl rubber. 3. Increasing the amount of epoxy resin added also enhances the pencil hardness and wear resistance of the hardened film; 4. The more butyl resin is added, the better it is for improving the acid and alkali resistance of the hardened film.

Claims

1. A wear-resistant, acid and alkali resistant UV curing liquid, characterized in that, Composed of the following components by mass: 10-30 parts by weight of high-functional aliphatic polyurethane acrylic resin, 10-20 parts by weight of epoxy acrylic resin, 3-15 parts by weight of butyl rubber, 2-10 parts by weight of photoinitiator, 0.5-2 parts by weight of leveling agent, 0.1-0.5 parts by weight of dispersant, and 50-100 parts by weight of organic solvent. The high-functional aliphatic polyurethane acrylate resin is a polyurethane acrylate resin or a hexafunctional polyurethane acrylate.

2. The wear-resistant, acid and alkali resistant UV curing liquid according to claim 1, characterized in that, The photoinitiator is selected from one or more of 1-hydroxy-cyclohexylbenzophenone (184) and 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO).

3. The wear-resistant, acid and alkali resistant UV curing liquid according to claim 1, characterized in that, The leveling agent is an acrylate or modified polysiloxane compound.

4. The wear-resistant, acid and alkali resistant UV curing liquid according to claim 1, characterized in that, The dispersant is selected from one or more of triethylhexylphosphate, sodium dodecyl sulfate, and methylpentanol.

5. The wear-resistant, acid and alkali resistant UV curing liquid according to claim 1, characterized in that, The viscosity of the hardening liquid is 50-120 cps at 25°C.

6. A method for preparing a wear-resistant, acid and alkali resistant, UV-curable film, characterized in that, Includes the following steps: a. Prepare the hardening liquid according to any one of claims 1-5; b. Preparation of wear-resistant, acid and alkali resistant UV curing film: Take a PET film, coat one or both sides of it with a layer of curing liquid, and then dry and irradiate with ultraviolet light to form a dense curing coating on the surface of the PET film, thus obtaining a wear-resistant, acid and alkali resistant UV curing film.

7. The method for preparing a wear-resistant, acid and alkali resistant, and UV-curable film according to claim 6, characterized in that, In step b, the drying step uses an oven, which employs segmented temperature control, as detailed below: The temperature range for the first segment is 60–70℃; the second segment is 70–80℃; the third segment is 90–100℃; the fourth segment is 110–120℃; the fifth segment is 120–130℃; the sixth segment is 120–130℃; the seventh segment is 100–110℃; and the eighth segment is 70–80℃. During drying, the PET film coated with the curing solution passes through the oven at a linear speed of 30–80 m / min.

8. The method for preparing a wear-resistant, acid and alkali resistant, and UV-curable film according to claim 6, characterized in that, In step b, the ultraviolet light irradiation source is a high-pressure mercury lamp, and its curing irradiation energy is 340 mJ / cm². 2 ~600mJ / cm 2, The irradiation time is 30s to 120s.

9. The method for preparing a wear-resistant, acid and alkali resistant, and UV-curable film according to claim 7, characterized in that, In step b, the thickness of the hardened coating is 1–5 μm.

10. A wear-resistant, acid and alkali resistant, UV-curable film, characterized in that, It is prepared by the preparation method according to any one of claims 6 to 9.

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