BOPET (Biaxially Oriented Polyester) pre-coating film containing anti-reflection layer SiO2 and TiO2 / PU (Polyurethane) as well as preparation method and application of BOPET pre-coating film

Abstract

The invention discloses a BOPET pre-coating film containing an anti-reflection layer SiO2 (at) TiO2 / PU, a preparation method and application, and belongs to the technical field of BOPET pre-coating films, and the preparation method of the anti-reflection layer SiO2 (at) TiO2 / PU comprises the following steps: adding nano TiO2 into alcohol for ultrasonic treatment, adding a polymer for stirring, then adding tetraethoxysilane and water, and stirring to obtain the BOPET pre-coating film containing the anti-reflection layer SiO2 (at) TiO2 / PU. After stirring, centrifuging, washing and drying in vacuum to prepare TiO2 coated SiO2 powder; dispersing the obtained TiO2 (at) SiO2 powder into an organic solution, adding polyurethane, performing ultrasonic treatment, adding a polymer, and stirring to obtain a SiO2 (at) TiO2 / PU dispersion liquid; the BOPET anti-reflection requirement in the prior art is met, reflection can be effectively reduced, the transmittance is improved, and the BOPET anti-reflection film has good industrial practicability.

Description

Technical Field

[0001] The present invention belongs to the technical field of BOPET pre-coating films, and in particular relates to a BOPET pre-coating film comprising an anti-reflection layer SiO2@TiO2 / PU, a preparation method and an application thereof. Background Art

[0002] At present, with the progress of society, PET materials are widely used in the field of electronic components. In lighting products, it can be used as key components such as anti-reflection film, reflective film and anti-glare film to improve lighting effects and optical transmission efficiency. In the automotive field, it can be used as a protective film or reflective film for instrument panels, central control screens, navigation displays, and vehicle display systems, providing high-quality display effects and durability. In the medical field, it can be used as screen protectors for medical displays, scanners, and surgical instruments, providing clear images and reliable protection. In the solar industry, it can be used as a protective film for solar panels and solar collectors.

[0003] Although BOPET is widely used in many fields as anti-reflection film, reflective film, protective film, and anti-glare film, the current BOPET cannot effectively resist reflection and the transmittance still has a lot of room for improvement. The pre-coating technology can reduce the reflection of light on its surface, thereby improving the transmittance. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention proposes a BOPET pre-coated film comprising an anti-reflective layer SiO2@TiO2 / PU, a preparation method and an application thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A method for preparing an anti-reflection layer SiO2@TiO2 / PU, the preparation method comprising the following steps:

[0007] Nano-TiO 2 Add alcohol for ultrasonic treatment, add polymer and stir, then add tetraethoxysilane and water, stir, centrifuge, wash and vacuum dry to obtain TiO 2 @SiO 2 Powder; the obtained TiO 2 @SiO 2 Powder, dispersed in organic solution, added polyurethane, ultrasonic, and then added polymer and stirred to obtain SiO 2 @TiO 2 / PU dispersion.

[0008] Preferably, the SiO 2 @TiO 2 TiO in PU 2It is rutile phase.

[0009] Preferably, the SiO 2 @TiO 2 / SiO in PU 2 The shell thickness is 5-10nm.

[0010] A BOPET pre-coated film comprising an anti-reflective layer SiO2@TiO2 / PU, comprising, from top to bottom:

[0011] Anti-reflection layer, hot melt adhesive layer, glue layer and substrate layer;

[0012] The anti-reflection layer comprises SiO 2 @TiO 2 / PU.

[0013] Preferably, the substrate layer is a composite BOPET film including polyethylene terephthalate and polyether block polyamide; the hot melt adhesive layer includes ethylene vinyl acetate, a compatibilizer and paraffin.

[0014] Preferably, the anti-reflection layer further comprises one or more of polyvinyl butyral, polyvinyl alcohol, polyvinylidene fluoride, polyvinyl pyrrolidone polymethyl methacrylate and polyethylene glycol.

[0015] Preferably, the hot melt adhesive layer further comprises ethylene-vinyl acetate polymer, and the vinyl acetate content of the ethylene-vinyl acetate polymer is 10%-30%.

[0016] Preferably, the compatibilizer includes one or more of C5 petroleum resin, high-density polyethylene and polyolefin elastomer.

[0017] A method for preparing a BOPET pre-coating film comprising an anti-reflection layer SiO2@TiO2 / PU, the method comprising the following steps:

[0018] unwinding the biaxially stretched composite polyethylene terephthalate substrate to obtain a substrate layer, and performing corona treatment on the surface of the substrate layer;

[0019] Polyethyleneimine, water and alcohol are made into a glue layer material and coated on the surface of the corona treated substrate layer, and then dried in an oven to form a glue layer;

[0020] A hot melt adhesive layer material made of ethylene-vinyl acetate, a compatibilizer and paraffin is coated on the surface of the glue layer by a casting method to form a hot melt adhesive layer; and a corona treatment is performed on the surface of the hot melt adhesive layer;

[0021] The SiO prepared by the preparation method of claim 1 2 @TiO 2 / PU dispersion is coated on the surface of the hot melt adhesive layer to form an anti-reflection layer to obtain an anti-reflection BOPET pre-coated film.

[0022] The above-mentioned BOPET pre-coated film containing the anti-reflection layer SiO2@TiO2 / PU or the BOPET pre-coated film containing the anti-reflection layer SiO2@TiO2 / PU prepared by the above-mentioned preparation method is used in the production of solar cell panels and in the manufacture of electronic components.

[0023] Preferably, the TEOS and TiO 2 The mass ratio is 1-50:100.

[0024] Preferably, the polymer and TiO 2 The mass ratio is 1-50:100.

[0025] Preferably, the PU and TiO 2 @SiO 2 The mass ratio is 30-70:100.

[0026] Preferably, the polymer and TiO 2 @SiO 2 The mass ratio is 1000-500:100.

[0027] Beneficial effects of the present invention: TiO used in the present invention 2 As an anti-reflective material, it can increase the anti-reflective performance of the pre-coated film. 2 Coated with TiO 2 Forming a core-shell structure, SiO 2 The shell thickness is adjustable, the addition of PU improves the compatibility with the film, and the coated polymer can also improve the anti-reflection property. In addition, the present invention solves the anti-reflection demand of BOPET in the prior art, can effectively reduce reflection, has simple process operation, and has good industrial applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a comparison chart of the transmittance of the pre-coated films prepared in Example 1, Example 2 and Comparative Example 1 of the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] An anti-reflective BOPET pre-coated film comprises, from top to bottom, an anti-reflective layer, a hot melt adhesive layer, a glue layer and a substrate layer, wherein the anti-reflective layer is SiO 2 @TiO 2 / PU The substrate layer is a composite BOPET film composed of PET and PEB. The raw materials for preparing the glue layer include, by mass percentage: 5% polyethyleneimine, 70% water, and 25% alcohol; the raw materials for preparing the hot melt adhesive layer include, by mass percentage: 80% ethylene-vinyl acetate, 10% compatibilizer, and 10% paraffin.

[0033] A method for preparing an anti-reflective BOPET pre-coating film comprises the following steps:

[0034] (1) Nano-TiO 2 Add alcohol for ultrasonic treatment, add PVP for stirring, then add TEOS (tetraethoxysilane) and water, stir, centrifuge, wash, and vacuum dry to obtain TiO 2 @SiO 2 Powder, of which TiO 2 , the mass ratio of alcohol, TEOS, water, and PVP is 50:400:5:300:10.

[0035] (2) The TiO obtained in step (1) 2 @SiO 2 Powder, dispersed in acetone, then added polyurethane PU, ultrasonic, added polyvinyl butyral ester and stirred to obtain SiO 2 @TiO 2 / PU dispersion, in which TiO 2 @SiO 2 , acetone, and PU have a mass ratio of 3000:50:500:30.

[0036] (3) The biaxially oriented composite PET substrate is unwound to obtain a substrate layer, and the surface of the substrate layer is subjected to a high-frequency and high-voltage pre-corona treatment at a voltage of 12 kW.

[0037] (4) Polyethyleneimine, water and alcohol are made into a glue layer material and coated on the surface of the corona treated substrate layer, and then dried in an oven to form a glue layer with a thickness of 2.5 μm.

[0038] (5) A hot melt adhesive layer material made of ethylene vinyl acetate, a compatibilizer and paraffin is coated by a casting method to form a hot melt adhesive layer; the thickness is 12 μm, and the surface of the hot melt adhesive layer is subjected to a high frequency and high voltage post-corona treatment with a corona power of 7 kW.

[0039] (6) SiO 2 @TiO 2 / PU dispersion is coated on the surface of the substrate layer to form an anti-reflection layer with a thickness of 8μm. After trimming, thickness measurement and winding, the anti-reflection BOPET pre-coated film can be obtained.

[0040] Example 2

[0041] An anti-reflective BOPET pre-coated film comprises, from top to bottom, an anti-reflective layer, a hot melt adhesive layer, a glue layer and a substrate layer, wherein the anti-reflective layer is SiO 2 @TiO 2 / PU The substrate layer is a composite BOPET film composed of PET and PEB. The raw materials for preparing the glue layer include, by mass percentage: 5% polyethyleneimine, 70% water, and 25% alcohol; the raw materials for preparing the hot melt adhesive layer include, by mass percentage: 80% ethylene-vinyl acetate, 10% compatibilizer, and 10% paraffin.

[0042] A method for preparing an anti-reflective BOPET pre-coating film comprises the following steps:

[0043] (1) Nano-TiO 2 Add alcohol for ultrasonic treatment, add PVP for stirring, then add TEOS (tetraethoxysilane) and water, stir, centrifuge, wash, and vacuum dry to obtain TiO 2 @SiO 2 Powder, of which TiO 2 , the mass ratio of alcohol, TEOS, water, and PVP is 50:400:5:300:10.

[0044] (2) The TiO obtained in step (1) 2 @SiO 2 Powder, dispersed in acetone, then added polyurethane PU, ultrasonic, added polyethylene glycol and stirred to obtain SiO 2 @TiO 2 / PU dispersion, in which TiO 2 @SiO 2 , acetone, and PU have a mass ratio of 3000:50:500:30.

[0045] (3) The biaxially oriented composite PET substrate is unwound to obtain a substrate layer, and the surface of the substrate layer is subjected to a high-frequency and high-voltage pre-corona treatment at a voltage of 12 kW.

[0046] (4) Polyethyleneimine, water and alcohol are made into a glue layer material and coated on the surface of the corona treated substrate layer, and then dried in an oven to form a glue layer with a thickness of 2.5 μm.

[0047] (5) A hot melt adhesive layer material made of ethylene vinyl acetate, a compatibilizer and paraffin is coated by a casting method to form a hot melt adhesive layer; the thickness is 12 μm, and the surface of the hot melt adhesive layer is subjected to a high frequency and high voltage post-corona treatment with a corona power of 7 kW.

[0048] (6) SiO 2 @TiO 2 / PU dispersion is coated on the surface of the substrate layer to form an anti-reflection layer with a thickness of 8μm. After trimming, thickness measurement and winding, the anti-reflection BOPET pre-coated film can be obtained.

[0049] Comparative Example 1

[0050] Compared with Example 1, the difference between Comparative Example 1 and Example 1 is that the prepared pre-coated film does not have an anti-reflection layer, and the other preparation steps are the same as those of Example 1.

[0051] The BOPET pre-coated films prepared in Example 1, Example 2 and Comparative Example 1 were tested on a UV-3600 ultraviolet-visible-near infrared spectrophotometer. Analysis showed that the anti-reflective BOPET pre-coated film prepared by the present invention can effectively resist reflection and improve transmittance. In the 300nm-700nm segment, the transmittance of Example 1 is better than that of Comparative Example 1, and the transmittance of Example 2 is better than that of Example 1.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for preparing an anti-reflection layer SiO2@TiO2 / PU, It is characterized in that The preparation method comprises the following steps: Nano-TiO 2 Add alcohol for ultrasonic treatment, add polymer and stir, then add tetraethoxysilane and water, stir, centrifuge, wash and vacuum dry to obtain TiO 2 @SiO 2 Powder; the obtained TiO 2 @SiO 2 Powder, dispersed in organic solution, added polyurethane, ultrasonic, and then added polymer and stirred to obtain SiO 2 @TiO 2 / PU dispersion.

2. The method for preparing the anti-reflection layer SiO2@TiO2 / PU according to claim 1, It is characterized in that The SiO 2 @TiO 2 TiO in PU 2 It is rutile phase.

3. The method for preparing the anti-reflection layer SiO2@TiO2 / PU according to claim 1, It is characterized in that The SiO 2 @TiO 2 / SiO in PU 2 The shell thickness is 5-10nm.

4. A BOPET pre-coated film comprising an anti-reflective layer SiO2@TiO2 / PU, It is characterized in that From top to bottom, they include: Anti-reflection layer, hot melt adhesive layer, glue layer and substrate layer; The anti-reflection layer comprises SiO prepared by any one of the preparation methods of claims 1 to 3. 2 @TiO 2 / PU.

5. The BOPET pre-coated film comprising an anti-reflection layer SiO2@TiO2 / PU according to claim 4, It is characterized in that The substrate layer is a composite BOPET film, comprising polyethylene terephthalate and polyether block polyamide; the hot melt adhesive layer comprises ethylene-vinyl acetate, a compatibilizer and paraffin.

6. The BOPET pre-coated film comprising an anti-reflection layer SiO2@TiO2 / PU according to claim 4, It is characterized in that The anti-reflection layer further comprises one or more of polyvinyl butyral, polyvinyl alcohol, polyvinylidene fluoride, polyvinyl pyrrolidone polymethyl methacrylate and polyethylene glycol.

7. The BOPET pre-coated film comprising an anti-reflection layer SiO2@TiO2 / PU according to claim 4, It is characterized in that The hot melt adhesive layer also includes ethylene-vinyl acetate polymer, and the vinyl acetate content of the ethylene-vinyl acetate polymer is 10%-30%.

8. The BOPET pre-coated film comprising an anti-reflection layer SiO2@TiO2 / PU according to claim 4, It is characterized in that The compatibilizer includes one or more of C5 petroleum resin, high-density polyethylene and polyolefin elastomer.

9. A method for preparing a BOPET pre-coated film comprising an anti-reflection layer SiO2@TiO2 / PU, It is characterized in that The method comprises the following steps: unwinding the biaxially stretched composite polyethylene terephthalate substrate to obtain a substrate layer, and performing corona treatment on the surface of the substrate layer; Polyethyleneimine, water and alcohol are made into a glue layer material and coated on the surface of the corona treated substrate layer, and then dried in an oven to form a glue layer; A hot melt adhesive layer material made of ethylene-vinyl acetate, a compatibilizer and paraffin is coated on the surface of the glue layer by a casting method to form a hot melt adhesive layer; and a corona treatment is performed on the surface of the hot melt adhesive layer; The SiO prepared by the preparation method of claim 1 2 @TiO 2 / PU dispersion is coated on the surface of the hot melt adhesive layer to form an anti-reflection layer to obtain an anti-reflection BOPET pre-coated film.

10. Use of the BOPET pre-coated film comprising an anti-reflection layer SiO2@TiO2 / PU according to any one of claims 4 to 8 or the BOPET pre-coated film comprising an anti-reflection layer SiO2@TiO2 / PU obtained by the preparation method according to claim 9 in the production of solar panels and in the manufacture of electronic components.

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