1. The high-hardness flexible UV coating on the surface of the optical PET film comprises a UV coating formula, a UV coating processing technology and UV coating performance detection, and is characterized in that: the UV coating formula comprises the following raw materials in parts by weight:

4.5-7 parts of photoinitiator

10-15 parts of fluorine-containing acrylate UV diluent

40-50 parts of 2-functional fluorine-silicon modified acrylate UV resin

15-20 parts of 18-functionality hyperbranched polyurethane acrylate UV resin

5-10 parts of 3-functional fluorine-containing acrylate UV resin.

2. The high-hardness flexible UV coating for the surface of optical PET film according to claim 1, characterized in that: the photoinitiator comprises 0.5-1 part of photoinitiator TPO and 4-6 parts of photoinitiator 184.

3. The high-hardness flexible UV coating for the surface of optical PET film according to claim 1, characterized in that: the fluorine-containing acrylate UV diluent is one or more of hexafluorobutyl acrylate, hexafluorobutyl methacrylate and dodecafluoroheptyl acrylate.

4. The high-hardness flexible UV coating for the surface of optical PET film according to claim 1, characterized in that: the molecular weight of the 2-functional fluorine-silicon modified acrylate UV resin is 3000g/mol 2000-, the molecular weight of the 18-functional hyperbranched structure polyurethane acrylate UV resin is 1500g/mol 1000-, and the molecular weight of the 3-functional fluorine-containing acrylate UV resin is 2000g/mol 1500-.

5. The high-hardness flexible UV coating for the surface of optical PET film according to claim 1, characterized in that: the processing steps of the UV coating are as follows:

step S1: proportioning the photoinitiator, the fluorine-containing acrylate UV diluent, the 2-functional fluorine-silicon modified acrylate UV resin, the 18-functionality hyperbranched structure polyurethane acrylate UV resin and the 3-functional fluorine-containing acrylate UV resin according to the parts ratio;

step S2: mixing the proportioned fluorine-containing acrylate UV diluent, 2-functional fluorine-silicon modified acrylate UV resin, 18-functionality hyperbranched structure polyurethane acrylate UV resin and 3-functional fluorine-containing acrylate UV resin, then adding a photoinitiator for dispersion operation to obtain a mixture, and stirring the mixture in a water bath;

step S3: and (5) freeze-drying the product stirred in the water bath of the step S2 to obtain the product.

6. The high-hardness flexible UV coating for the surface of optical PET film according to claim 5, characterized in that: and in the step S2, an ultrasonic generator is adopted for dispersion operation, the water bath temperature in the step S2 is 75 ℃, a magnetic stirrer is adopted for stirring for 24 hours in the step S2, the freeze-drying temperature in the step S3 is-10 ℃, and the freeze-drying time is 12 hours.

7. The high-hardness flexible UV coating for the surface of optical PET film according to claim 1, characterized in that: the UV coating performance detection respectively comprises the following steps: the method comprises the following steps of coating hardness detection, coating light transmittance detection, coating flexibility detection and coating water contact angle detection.

8. The high-hardness flexible UV coating for the surface of optical PET film according to claim 7, characterized in that: the coating hardness detection adopts a hardness detector, the coating light transmittance detection adopts a light transmittance tester, the coating flexibility detection adopts a cylindrical shaft rod instrument, and the coating water contact angle detection adopts a contact angle tester.

Background

Optical films are a class of optical media materials that are constructed from thin layered media that transmit light beams across an interface, and optical films have been widely used in the optical and optoelectronic arts to fabricate a variety of optical instruments. The optical PET film is one of optical films, and has good transparency and luster; has good air tightness and fragrance retention.

However, the optical PET film is soft and has no scratch resistance, although the scratch resistance can be achieved by coating a layer of scratch-resistant coating on the surface of the optical PET film, the surface hardness is usually difficult to be more than 4H (pencil hardness), and the brittleness of the high-hardness coating is too large, so that the rolling of the PET film is influenced.

Disclosure of Invention

The invention aims to provide a high-hardness flexible UV coating on the surface of an optical PET film to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

the high-hardness flexible UV coating on the surface of the optical PET film comprises a UV coating formula, a UV coating processing technology and UV coating performance detection, wherein the UV coating formula comprises the following raw materials in parts by weight:

4.5-7 parts of photoinitiator

10-15 parts of fluorine-containing acrylate UV diluent

40-50 parts of 2-functional fluorine-silicon modified acrylate UV resin

15-20 parts of 18-functionality hyperbranched polyurethane acrylate UV resin

5-10 parts of 3-functional fluorine-containing acrylate UV resin.

As a further scheme of the invention: the photoinitiator comprises 0.5-1 part of photoinitiator TPO and 4-6 parts of photoinitiator 184.

As a still further scheme of the invention: the fluorine-containing acrylate UV diluent is one or more of hexafluorobutyl acrylate, hexafluorobutyl methacrylate and dodecafluoroheptyl acrylate.

As a still further scheme of the invention: the molecular weight of the 2-functional fluorine-silicon modified acrylate UV resin is 3000g/mol 2000-, the molecular weight of the 18-functional hyperbranched structure polyurethane acrylate UV resin is 1500g/mol 1000-, and the molecular weight of the 3-functional fluorine-containing acrylate UV resin is 2000g/mol 1500-.

As a still further scheme of the invention: the processing steps of the UV coating are as follows:

step S1: proportioning the photoinitiator, the fluorine-containing acrylate UV diluent, the 2-functional fluorine-silicon modified acrylate UV resin, the 18-functionality hyperbranched structure polyurethane acrylate UV resin and the 3-functional fluorine-containing acrylate UV resin according to the parts ratio;

step S2: mixing the proportioned fluorine-containing acrylate UV diluent, 2-functional fluorine-silicon modified acrylate UV resin, 18-functionality hyperbranched structure polyurethane acrylate UV resin and 3-functional fluorine-containing acrylate UV resin, then adding a photoinitiator for dispersion operation to obtain a mixture, and stirring the mixture in a water bath;

step S3: and (5) freeze-drying the product stirred in the water bath of the step S2 to obtain the product.

As a still further scheme of the invention: and in the step S2, an ultrasonic generator is adopted for dispersion operation, the water bath temperature in the step S2 is 75 ℃, a magnetic stirrer is adopted for stirring for 24 hours in the step S2, the freeze-drying temperature in the step S3 is-10 ℃, and the freeze-drying time is 12 hours.

As a still further scheme of the invention: the UV coating performance detection respectively comprises the following steps: the method comprises the following steps of coating hardness detection, coating light transmittance detection, coating flexibility detection and coating water contact angle detection.

As a still further scheme of the invention: the coating hardness detection adopts a hardness detector, the coating light transmittance detection adopts a light transmittance tester, the coating flexibility detection adopts a cylindrical shaft rod instrument, and the coating water contact angle detection adopts a contact angle tester.

Compared with the prior art, the invention has the beneficial effects that: the UV coating has good performance, the light transmittance of the cured coating reaches 92.5-93%, the coating has good adhesion on a PET film, the cured coating can reach pencil hardness of 4H only with very low thickness, the coating has good flexibility, the rolling of the PET film is not influenced, and the water contact angle of the coating is 100-105 degrees, so that the coating has a good antifouling effect.

Drawings

FIG. 1 is a graph of performance test results of a high-hardness flexible UV coating on the surface of an optical PET film.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In embodiment 1 of the invention, the high-hardness flexible UV coating on the surface of the optical PET film comprises a UV coating formula, a UV coating processing technology and UV coating performance detection, wherein the UV coating formula comprises the following raw materials in parts by weight:

photoinitiator 7 parts

10 portions of fluorine-containing acrylate UV diluent

40 parts of 2-functional fluorine-silicon modified acrylate UV resin

15 parts of 18-functionality hyperbranched structure polyurethane acrylate UV resin

5 parts of 3-functional fluorine-containing acrylate UV resin.

The photoinitiator is 0.5 to 1 part of photoinitiator TPO and 4 to 6 parts of photoinitiator 184; the fluorine-containing acrylate UV diluent is one or more of hexafluorobutyl acrylate, hexafluorobutyl methacrylate and dodecafluoroheptyl acrylate; the molecular weight of the 2-functional fluorine-silicon modified acrylate UV resin is 2000-3000 g/mol; the molecular weight of the 18-functionality hyperbranched structure polyurethane acrylate UV resin is 1000-1500 g/mol; the molecular weight of the 3-functional fluorine-containing acrylate UV resin is 1500-2000 g/mol.

The processing steps of the UV coating are as follows:

step S1: proportioning the photoinitiator, the fluorine-containing acrylate UV diluent, the 2-functional fluorine-silicon modified acrylate UV resin, the 18-functionality hyperbranched structure polyurethane acrylate UV resin and the 3-functional fluorine-containing acrylate UV resin according to the parts ratio;

step S2: mixing the proportioned fluorine-containing acrylate UV diluent, 2-functional fluorine-silicon modified acrylate UV resin, 18-functionality hyperbranched structure polyurethane acrylate UV resin and 3-functional fluorine-containing acrylate UV resin, then adding a photoinitiator, and performing dispersion operation by using an ultrasonic generator to obtain a mixture, and stirring the mixture by using a magnetic stirrer in a water bath at the water bath temperature of 75 ℃ for 24 hours;

step S3: and (5) freeze-drying the product stirred in the water bath of the step S2, wherein the freeze-drying temperature is-10 ℃, and the freeze-drying time is 12 hours, so that the product can be obtained.

The UV paint performance detection comprises the following steps: detecting the hardness of the coating, detecting the light transmittance of the coating, detecting the flexibility of the coating and detecting the water contact angle of the coating; the hardness detection of the layer adopts a hardness detector, the light transmittance detection of the coating adopts a light transmittance tester, the flexibility detection of the coating adopts a cylindrical shaft rod instrument, the water contact angle detection of the coating adopts a contact angle tester, and corresponding data is obtained.

In embodiment 2 of the invention, the high-hardness flexible UV coating on the surface of the optical PET film comprises a UV coating formula, a UV coating processing technology and UV coating performance detection, wherein the UV coating formula comprises the following raw materials in parts by weight:

photoinitiator 7 parts

Fluorine-containing acrylate UV diluent 15 parts

40 parts of 2-functional fluorine-silicon modified acrylate UV resin

15 parts of 18-functionality hyperbranched structure polyurethane acrylate UV resin

5 parts of 3-functional fluorine-containing acrylate UV resin.

The photoinitiator is 0.5 to 1 part of photoinitiator TPO and 4 to 6 parts of photoinitiator 184; the fluorine-containing acrylate UV diluent is one or more of hexafluorobutyl acrylate, hexafluorobutyl methacrylate and dodecafluoroheptyl acrylate; the molecular weight of the 2-functional fluorine-silicon modified acrylate UV resin is 2000-3000 g/mol; the molecular weight of the 18-functionality hyperbranched structure polyurethane acrylate UV resin is 1000-1500 g/mol; the molecular weight of the 3-functional fluorine-containing acrylate UV resin is 1500-2000 g/mol.

The processing steps of the UV coating are as follows:

step S1: proportioning the photoinitiator, the fluorine-containing acrylate UV diluent, the 2-functional fluorine-silicon modified acrylate UV resin, the 18-functionality hyperbranched structure polyurethane acrylate UV resin and the 3-functional fluorine-containing acrylate UV resin according to the parts ratio;

step S2: mixing the proportioned fluorine-containing acrylate UV diluent, 2-functional fluorine-silicon modified acrylate UV resin, 18-functionality hyperbranched structure polyurethane acrylate UV resin and 3-functional fluorine-containing acrylate UV resin, then adding a photoinitiator, and performing dispersion operation by using an ultrasonic generator to obtain a mixture, and stirring the mixture by using a magnetic stirrer in a water bath at the water bath temperature of 75 ℃ for 24 hours;

step S3: and (5) freeze-drying the product stirred in the water bath of the step S2, wherein the freeze-drying temperature is-10 ℃, and the freeze-drying time is 12 hours, so that the product can be obtained.

The UV paint performance detection comprises the following steps: detecting the hardness of the coating, detecting the light transmittance of the coating, detecting the flexibility of the coating and detecting the water contact angle of the coating; the hardness detection of the layer adopts a hardness detector, the light transmittance detection of the coating adopts a light transmittance tester, the flexibility detection of the coating adopts a cylindrical shaft rod instrument, the water contact angle detection of the coating adopts a contact angle tester, and corresponding data is obtained.

In embodiment 3 of the invention, the high-hardness flexible UV coating on the surface of the optical PET film comprises a UV coating formula, a UV coating processing technology and UV coating performance detection, wherein the UV coating formula comprises the following raw materials in parts by weight:

photoinitiator 7 parts

10 portions of fluorine-containing acrylate UV diluent

50 parts of 2-functional fluorine-silicon modified acrylate UV resin

15 parts of 18-functionality hyperbranched structure polyurethane acrylate UV resin

5 parts of 3-functional fluorine-containing acrylate UV resin.

The photoinitiator is 0.5 to 1 part of photoinitiator TPO and 4 to 6 parts of photoinitiator 184; the fluorine-containing acrylate UV diluent is one or more of hexafluorobutyl acrylate, hexafluorobutyl methacrylate and dodecafluoroheptyl acrylate; the molecular weight of the 2-functional fluorine-silicon modified acrylate UV resin is 2000-3000 g/mol; the molecular weight of the 18-functionality hyperbranched structure polyurethane acrylate UV resin is 1000-1500 g/mol; the molecular weight of the 3-functional fluorine-containing acrylate UV resin is 1500-2000 g/mol.

The processing steps of the UV coating are as follows:

step S1: proportioning the photoinitiator, the fluorine-containing acrylate UV diluent, the 2-functional fluorine-silicon modified acrylate UV resin, the 18-functionality hyperbranched structure polyurethane acrylate UV resin and the 3-functional fluorine-containing acrylate UV resin according to the parts ratio;

step S2: mixing the proportioned fluorine-containing acrylate UV diluent, 2-functional fluorine-silicon modified acrylate UV resin, 18-functionality hyperbranched structure polyurethane acrylate UV resin and 3-functional fluorine-containing acrylate UV resin, then adding a photoinitiator, and performing dispersion operation by using an ultrasonic generator to obtain a mixture, and stirring the mixture by using a magnetic stirrer in a water bath at the water bath temperature of 75 ℃ for 24 hours;

step S3: and (5) freeze-drying the product stirred in the water bath of the step S2, wherein the freeze-drying temperature is-10 ℃, and the freeze-drying time is 12 hours, so that the product can be obtained.

The UV paint performance detection comprises the following steps: detecting the hardness of the coating, detecting the light transmittance of the coating, detecting the flexibility of the coating and detecting the water contact angle of the coating; the hardness detection of the layer adopts a hardness detector, the light transmittance detection of the coating adopts a light transmittance tester, the flexibility detection of the coating adopts a cylindrical shaft rod instrument, the water contact angle detection of the coating adopts a contact angle tester, and corresponding data is obtained.

In embodiment 4 of the invention, the high-hardness flexible UV coating on the surface of the optical PET film comprises a UV coating formula, a UV coating processing technology and UV coating performance detection, wherein the UV coating formula comprises the following raw materials in parts by weight:

photoinitiator 7 parts

10 portions of fluorine-containing acrylate UV diluent

40 parts of 2-functional fluorine-silicon modified acrylate UV resin

20 parts of 18-functionality hyperbranched structure polyurethane acrylate UV resin

5 parts of 3-functional fluorine-containing acrylate UV resin.

The photoinitiator is 0.5 to 1 part of photoinitiator TPO and 4 to 6 parts of photoinitiator 184; the fluorine-containing acrylate UV diluent is one or more of hexafluorobutyl acrylate, hexafluorobutyl methacrylate and dodecafluoroheptyl acrylate; the molecular weight of the 2-functional fluorine-silicon modified acrylate UV resin is 2000-3000 g/mol; the molecular weight of the 18-functionality hyperbranched structure polyurethane acrylate UV resin is 1000-1500 g/mol; the molecular weight of the 3-functional fluorine-containing acrylate UV resin is 1500-2000 g/mol.

The processing steps of the UV coating are as follows:

step S1: proportioning the photoinitiator, the fluorine-containing acrylate UV diluent, the 2-functional fluorine-silicon modified acrylate UV resin, the 18-functionality hyperbranched structure polyurethane acrylate UV resin and the 3-functional fluorine-containing acrylate UV resin according to the parts ratio;

step S2: mixing the proportioned fluorine-containing acrylate UV diluent, 2-functional fluorine-silicon modified acrylate UV resin, 18-functionality hyperbranched structure polyurethane acrylate UV resin and 3-functional fluorine-containing acrylate UV resin, then adding a photoinitiator, and performing dispersion operation by using an ultrasonic generator to obtain a mixture, and stirring the mixture by using a magnetic stirrer in a water bath at the water bath temperature of 75 ℃ for 24 hours;

step S3: and (5) freeze-drying the product stirred in the water bath of the step S2, wherein the freeze-drying temperature is-10 ℃, and the freeze-drying time is 12 hours, so that the product can be obtained.

The UV paint performance detection comprises the following steps: detecting the hardness of the coating, detecting the light transmittance of the coating, detecting the flexibility of the coating and detecting the water contact angle of the coating; the hardness detection of the layer adopts a hardness detector, the light transmittance detection of the coating adopts a light transmittance tester, the flexibility detection of the coating adopts a cylindrical shaft rod instrument, the water contact angle detection of the coating adopts a contact angle tester, and corresponding data is obtained.

In embodiment 5 of the invention, the high-hardness flexible UV coating on the surface of the optical PET film comprises a UV coating formula, a UV coating processing technology and UV coating performance detection, wherein the UV coating formula comprises the following raw materials in parts by weight:

photoinitiator 7 parts

10 portions of fluorine-containing acrylate UV diluent

40 parts of 2-functional fluorine-silicon modified acrylate UV resin

15 parts of 18-functionality hyperbranched structure polyurethane acrylate UV resin

10 parts of 3-functional fluorine-containing acrylate UV resin.

The photoinitiator is 0.5 to 1 part of photoinitiator TPO and 4 to 6 parts of photoinitiator 184; the fluorine-containing acrylate UV diluent is one or more of hexafluorobutyl acrylate, hexafluorobutyl methacrylate and dodecafluoroheptyl acrylate; the molecular weight of the 2-functional fluorine-silicon modified acrylate UV resin is 2000-3000 g/mol; the molecular weight of the 18-functionality hyperbranched structure polyurethane acrylate UV resin is 1000-1500 g/mol; the molecular weight of the 3-functional fluorine-containing acrylate UV resin is 1500-2000 g/mol.

The processing steps of the UV coating are as follows:

step S1: proportioning the photoinitiator, the fluorine-containing acrylate UV diluent, the 2-functional fluorine-silicon modified acrylate UV resin, the 18-functionality hyperbranched structure polyurethane acrylate UV resin and the 3-functional fluorine-containing acrylate UV resin according to the parts ratio;

step S2: mixing the proportioned fluorine-containing acrylate UV diluent, 2-functional fluorine-silicon modified acrylate UV resin, 18-functionality hyperbranched structure polyurethane acrylate UV resin and 3-functional fluorine-containing acrylate UV resin, then adding a photoinitiator, and performing dispersion operation by using an ultrasonic generator to obtain a mixture, and stirring the mixture by using a magnetic stirrer in a water bath at the water bath temperature of 75 ℃ for 24 hours;

step S3: and (5) freeze-drying the product stirred in the water bath of the step S2, wherein the freeze-drying temperature is-10 ℃, and the freeze-drying time is 12 hours, so that the product can be obtained.

The UV paint performance detection comprises the following steps: detecting the hardness of the coating, detecting the light transmittance of the coating, detecting the flexibility of the coating and detecting the water contact angle of the coating; the hardness detection of the layer adopts a hardness detector, the light transmittance detection of the coating adopts a light transmittance tester, the flexibility detection of the coating adopts a cylindrical shaft rod instrument, the water contact angle detection of the coating adopts a contact angle tester, and corresponding data is obtained.

As can be seen from fig. 1, the coating transmittance of the UV coating is high, reaching 92.5 to 93%, the coating flexibility and the coating water contact angle in example 2 are both improved, the coating flexibility and the coating water contact angle in example 3 are both improved, the coating hardness and the coating flexibility in example 4 are both improved, and the coating hardness and the coating water contact angle in example 5 are both improved; because the molecular chain of the fluorine-containing acrylate UV diluent contains fluorine atoms, the flexibility of the coating and the water contact angle (antifouling performance) of the coating can be improved; because the molecular chain of the 2-functional fluorine-silicon modified acrylate UV resin contains fluorine atoms, the flexibility of the coating and the water contact angle (antifouling performance) of the coating can be improved; because the functionality of the polyurethane acrylate UV resin with the hyperbranched structure of 18 functionality is high, the surface hardness of the coating can be obviously improved, and meanwhile, due to the introduction of the hyperbranched structure, the brittleness of the coating can be effectively reduced, and the flexibility of the coating can be improved; the 3-functional fluorine-containing acrylate UV resin can improve the antifouling property of the coating and can also improve the hardness of the coating.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.