Display screen functional film and preparation method and application thereof

Abstract

The application discloses a display screen functional film and a preparation method and application thereof, and belongs to the technical field of functional film materials. The method comprises the following steps: S1, SiO2 nanoparticles, ethanol, acetonitrile, polyvinylpyrrolidone and deionized water are mixed, and ultrasonic dispersion is carried out to obtain a dispersion liquid; tetrabutyl titanate is slowly added into the dispersion liquid, heating and stirring are carried out, and washing, drying and annealing are carried out to obtain SiO2@TiO2 particles; the SiO2@TiO2 particles, an epoxy-containing silane coupling agent and methanol are mixed, heating and stirring are carried out, and washing, drying and annealing are carried out to obtain modified SiO2@TiO2 particles. S2, the modified SiO2@TiO2 particles, 4,4'-diamino diphenyl sulfone and a leveling agent are dispersed in methyl isobutyl ketone, mixing is carried out, ultrasonic defoaming is carried out, and a coating is obtained; the coating is uniformly coated on an optical film, and the functional film with good light transmission, ultraviolet resistance and hydrophobicity is obtained after temperature rising and drying.

Description

Technical Field

[0001] This invention belongs to the field of functional film materials technology, specifically relating to a display screen functional film, its preparation method, and its application. Background Technology

[0002] Display functional films are mainly used in electronics, packaging materials, industry (including automotive), and aerospace. In display technology, they are used to improve display effects and user experience, such as polarizers and backlight module optical films. With the widespread adoption of smartphones, tablets, and other consumer electronics, the demand for large in-vehicle infotainment screens is increasing. Display functional film technology is developing towards thinner, more flexible, and more functional designs. Functional films are gradually shifting from simple anti-glare and fingerprint-resistant functions to multifunctional optical films that offer anti-glare, anti-reflection, and fingerprint resistance. Currently, display functional films with low-reflection capabilities are produced through vacuum deposition, a method that requires sophisticated production equipment and processes. Another method involves adding low-refractive-index hollow silica particles to coatings to create functional coatings that achieve anti-reflection effects. However, the high cost and technological barriers of hollow silica particles limit its development.

[0003] Patent application CN 115895327 A discloses a functional film for a display screen, its preparation method, and its application. The functional film uses flower-shaped silica particles, which have good compatibility with other components of the coating and also possess advantages such as low refractive index and stable physicochemical properties. This functional film prepared from silica particles features high light transmittance, anti-reflection, and anti-glare properties, as well as excellent fingerprint resistance, thereby improving the security and ease of use of automotive displays. However, further functional improvements are possible, such as enhancing antibacterial properties and UV / blue light protection. Summary of the Invention

[0004] The purpose of this invention is to provide a display screen functional film, its preparation method and application, so as to improve the ultraviolet light protection performance of the display screen functional film.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A method for preparing a functional film for a display screen includes the following steps:

[0007] S1. SiO2 nanoparticles, ethanol, acetonitrile, polyvinylpyrrolidone, and deionized water are mixed and ultrasonically dispersed to obtain a dispersion. Tetrabutyl titanate is slowly added dropwise to the dispersion, heated and stirred, washed, dried, and annealed to obtain SiO2@TiO2 particles. SiO2@TiO2 particles, an epoxy-containing silane coupling agent, and methanol are mixed, heated and stirred, washed, and dried to obtain modified SiO2@TiO2 particles.

[0008] S2. Modified SiO2@TiO2 particles, 4,4'-diaminodiphenyl sulfone, and leveling agent are dispersed in methyl isobutyl ketone, mixed, and ultrasonically degassed to obtain a coating. The coating is uniformly coated onto an optical film, and the film is dried at a high temperature to obtain a functional film.

[0009] Furthermore, the ratio of SiO2 nanoparticles, anhydrous ethanol, acetonitrile, polyvinylpyrrolidone, deionized water and tetrabutyl titanate is (5-7.5) g : (750-900) mL : (100-200) mL : (0.5-1) g : (400-500) mL : (30-50) mL.

[0010] Furthermore, the heating and stirring are carried out at 55-65°C for 12-14 hours; the annealing is carried out at 500-600°C for 2-3 hours.

[0011] Furthermore, the ratio of SiO2@TiO2 particles, epoxy-containing silane coupling agent, and methanol is (5-7.5) g: (0.8-1) g: (250-350) mL.

[0012] Furthermore, the epoxy-containing silane coupling agent is one of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 3-[(2,3)-epoxypropoxy]propylmethyldimethoxysilane, trimethoxy[2-(7-oxabicyclo[4.1.0]hept-3-yl)ethyl]silane, and 3-glycidyl etheroxypropyltriethoxysilane.

[0013] Furthermore, the ratio of the modified SiO2@TiO2, 4,4'-diaminodiphenyl sulfone, leveling agent, and methyl isobutyl ketone is (3-6) g: (0.3-0.5) g: (0.01-0.03) g: (25-35) mL.

[0014] Furthermore, the coating thickness is 6–10 μm; the drying process is carried out at 155–175 °C for 6–8 hours.

[0015] Furthermore, a display screen functional film is prepared by the above-described method for preparing the display screen functional film.

[0016] Furthermore, the application of the display functional film in the display screen.

[0017] The beneficial effects of this invention are:

[0018] (1) The display screen functional film provided by the present invention has good light transmittance and UV protection performance. The preparation process is simple and easy to scale up production. It can be widely used in various types of displays.

[0019] (2) The modified SiO2@TiO2 particles used in this invention coat TiO2 on the outer layer of SiO2, which improves the compatibility between TiO2 and SiO2 materials and prevents spontaneous aggregation of particles. The addition of TiO2 can also absorb and reflect ultraviolet rays, and has a strong blocking ability against ultraviolet rays.

[0020] (3) The epoxy-containing silane coupling agent used in this invention improves the dispersibility between SiO2@TiO2 particles. At the same time, the epoxy group of the coupling agent and the amino group of 4,4'-diaminodiphenyl sulfone form a covalent bond, which improves the mechanical properties of the material. On the other hand, the phenyl group contained in 4,4'-diaminodiphenyl sulfone improves the hydrophobicity and mechanical strength of the material, thereby enhancing the wear resistance of the functional membrane. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1

[0023] This embodiment provides a display screen functional film, which is prepared through the following steps:

[0024] S1. Mix 6g SiO2 nanoparticles, 800mL ethanol, 150mL acetonitrile, 0.6g polyvinylpyrrolidone, and 450mL deionized water, and ultrasonically disperse to obtain a dispersion. Slowly add 45mL tetrabutyl titanate to the dispersion, stir at 65℃ for 12h, wash and dry, and anneal at 600℃ for 2h to obtain SiO2@TiO2 particles. Mix 6g SiO2@TiO2 particles, 1g γ-(2,3-epoxypropoxy)propyltrimethoxysilane, and 300mL methanol, heat and stir, wash and dry to obtain modified SiO2@TiO2 particles.

[0025] S2. Disperse 5g of modified SiO2@TiO2 particles, 0.4g of 4,4'-diaminodiphenyl sulfone, and 0.02g of leveling agent in 30mL of methyl isobutyl ketone, mix well, and degas by ultrasonication to obtain a coating. Coat the coating evenly onto the optical film to a thickness of 8μm, and dry at 175℃ for 6h to obtain the functional film.

[0026] The prepared functional film is applied to a display screen.

[0027] Example 2

[0028] The difference between this embodiment and Example 1 is that "6g SiO2 nanoparticles" and "45mL tetrabutyl titanate" in S1 are changed to "5g SiO2 nanoparticles" and "50mL tetrabutyl titanate".

[0029] The remaining raw materials and preparation process are the same as in Example 1.

[0030] Example 3

[0031] The difference between this embodiment and Example 1 is that "6g SiO2 nanoparticles" and "45mL tetrabutyl titanate" in S1 are replaced with "7g SiO2 nanoparticles" and "30mL tetrabutyl titanate".

[0032] The remaining raw materials and preparation process are the same as in Example 1.

[0033] Example 4

[0034] The difference between this embodiment and Example 1 is that “6g SiO2@TiO2 particles, 1g γ-(2,3-epoxypropoxy)propyltrimethoxysilane” in S1 is changed to “5g SiO2@TiO2 particles, 1g γ-(2,3-epoxypropoxy)propyltrimethoxysilane”.

[0035] The remaining raw materials and preparation process are the same as in Example 1.

[0036] Example 5

[0037] The difference between this embodiment and Example 1 is that "6g SiO2@TiO2 particles, 1g γ-(2,3-epoxypropoxy)propyltrimethoxysilane" in S1 is changed to "7g SiO2@TiO2 particles, 0.8g γ-(2,3-epoxypropoxy)propyltrimethoxysilane".

[0038] The remaining raw materials and preparation process are the same as in Example 1.

[0039] Example 6

[0040] The difference between this embodiment and Example 1 is that “γ-(2,3-epoxypropoxy)propyltrimethoxysilane” in S1 is replaced with “trimethoxy[2-(7-oxabicyclo[4.1.0]hept-3-yl)ethyl]silane”.

[0041] The remaining raw materials and preparation process are the same as in Example 1.

[0042] Example 7

[0043] The difference between this embodiment and Example 1 is that "5g modified SiO2@TiO2 particles, 0.4g 4,4'-diaminodiphenyl sulfone, 0.02g leveling agent" in S2 is changed to "4g modified SiO2@TiO2 particles, 0.5g 4,4'-diaminodiphenyl sulfone, 0.03g leveling agent".

[0044] The remaining raw materials and preparation process are the same as in Example 1.

[0045] Example 8

[0046] The difference between this embodiment and Embodiment 1 is that "the coating thickness is 8μm" is changed to "the coating thickness is 6μm".

[0047] The remaining raw materials and preparation process are the same as in Example 1.

[0048] Example 9

[0049] The difference between this embodiment and Embodiment 1 is that "the coating thickness is 8 μm" is changed to "the coating thickness is 10 μm".

[0050] The remaining raw materials and preparation process are the same as in Example 1.

[0051] Comparative Example 1

[0052] The difference between this comparative example and Example 1 is that S1 does not involve TiO2 coating. The specific implementation steps of S1 are as follows:

[0053] S1. Mix 6g of SiO2 nanoparticles, 1g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane and 300mL of methanol, heat and stir, wash and dry to obtain modified SiO2 particles.

[0054] The remaining raw materials and preparation process are the same as in Example 1.

[0055] Comparative Example 2

[0056] The difference between this comparative example and Example 1 is that SiO2 and TiO2 are directly mixed in S1. The specific implementation steps of S1 are as follows:

[0057] S1. Mix 6g SiO2 nanoparticles, 800mL ethanol, 150mL acetonitrile, 0.6g polyvinylpyrrolidone and 450mL deionized water, and ultrasonically disperse to obtain a dispersion; add 2g TiO2 nanoparticles to the dispersion, stir at 65℃ for 12h, wash and dry, and anneal at 600℃ for 2h to obtain SiO2 / TiO2 particles; mix 6g SiO2 / TiO2 particles, 1g γ-(2,3-epoxypropoxy)propyltrimethoxysilane and 300mL methanol, heat and stir, wash and dry to obtain modified SiO2 / TiO2 particles.

[0058] The remaining raw materials and preparation process are the same as in Example 1.

[0059] Comparative Example 3

[0060] The difference between this comparative example and Example 1 is that "γ-(2,3-epoxypropoxy)propyltrimethoxysilane" was replaced with "silane coupling agent KH550".

[0061] The remaining raw materials and preparation process are the same as in Example 1.

[0062] Comparative Example 4

[0063] The difference between this comparative example and Example 1 is that 4,4'-diaminodiphenyl sulfone is not added in S2.

[0064] The remaining raw materials and preparation process are the same as in Example 1.

[0065] Comparative Example 5

[0066] The difference between this comparative example and Example 1 is that neither silane coupling agent nor 4,4'-diaminodiphenyl sulfone is added. The specific implementation steps are as follows:

[0067] S1. Mix 6g of SiO2 nanoparticles, 800mL of ethanol, 150mL of acetonitrile, 0.6g of polyvinylpyrrolidone and 450mL of deionized water, and ultrasonically disperse them evenly to obtain a dispersion; slowly add 45mL of tetrabutyl titanate to the dispersion, stir at 65℃ for 12h, wash and dry, and anneal at 600℃ for 2h to obtain SiO2@TiO2 particles;

[0068] S2. Disperse 5g of SiO2@TiO2 particles and 0.02g of leveling agent in 30mL of methyl isobutyl ketone, mix well, and degas by ultrasonication to obtain a coating; coat the coating evenly onto the optical film with a coating thickness of 8μm, and dry at 175℃ for 6h to obtain the functional film.

[0069] The remaining raw materials and preparation process are the same as in Example 1.

[0070] The performance of the functional membranes prepared in Examples 1-9 and Comparative Examples 1-5 was tested:

[0071] The transmittance of the functional film in the ultraviolet and visible bands was tested using a UV-Vis spectrophotometer, with a wavelength range of 200–800 nm. The haze of the functional film was tested using a color analyzer.

[0072] The contact angle was measured using a contact angle meter to ensure the surface of the functional membrane was clean and dust-free. Distilled water was used to ensure its purity and consistency. The functional membrane was placed flat on the sample stage to ensure the coating surface was flat and free of air bubbles. 1 μL of distilled water was added using a microsyringe. Immediately after adding the distilled water, an image was captured using a high-speed camera to measure the contact angle.

[0073] The wear resistance tester was used to test the total load on the functional membrane of 1000g, the friction material was steel wool, the reciprocating friction frequency was 120 times / min, the friction area was about 40mm×40mm, and the contact angle was measured again.

[0074] The results are shown in Table 1:

[0075] Table 1

[0076]

[0077]

[0078] As can be seen from Table 1, the only difference between Examples 2 to 7 and Example 1 is the modification of the raw material content and ratio within a reasonable range. The results show that the prepared functional film has good UV protection, transparency and hydrophobicity. The difference between Examples 8 and 9 and Example 1 is the change in coating thickness. The results show that if the coating thickness is too thin, it will affect the performance of the functional film. If the coating thickness is too thick, it will also lead to a decrease in coating performance and an increase in cost.

[0079] The purpose of comparing Comparative Examples 1-2, Comparative Examples 5, and Example 1 is to illustrate the effect of the addition of TiO2 and the method of addition on the functional film. The results show that TiO2 coating the outer layer of SiO2 not only has a strong ability to block ultraviolet rays, but also improves the compatibility between SiO2 and the material and prevents spontaneous particle aggregation. Compared with Example 1, Comparative Examples 3-5 have good hydrophobicity after being rubbed with steel wool because the epoxy group of the coupling agent and the amino group of 4,4'-diaminodiphenyl sulfone form a covalent bond, which improves the wear resistance of the functional film.

[0080] In summary, the present invention provides a display screen functional film and its preparation method, which, when applied to a display screen, exhibits good light transmittance, UV protection, and hydrophobicity, and has promising application prospects in various fields of display screen functional films.

[0081] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0082] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a functional film for a display screen, characterized in that, Includes the following steps: S1. SiO2 nanoparticles, ethanol, acetonitrile, polyvinylpyrrolidone, and deionized water are mixed and ultrasonically dispersed to obtain a dispersion. Tetrabutyl titanate is slowly added dropwise to the dispersion, heated and stirred, washed, dried, and annealed to obtain SiO2@TiO2 particles. SiO2@TiO2 particles, an epoxy-containing silane coupling agent, and methanol are mixed, heated and stirred, washed, and dried to obtain modified SiO2@TiO2 particles. The modified SiO2@TiO2 particles are SiO2 coated with TiO2. S2. Modified SiO2@TiO2 particles, 4,4'-diaminodiphenyl sulfone, and leveling agent are dispersed in methyl isobutyl ketone, mixed, and ultrasonically degassed to obtain a coating. The coating is uniformly coated onto an optical film, and the film is dried at a high temperature to obtain a functional film.

2. The method for preparing a display screen functional film according to claim 1, characterized in that, The ratio of SiO2 nanoparticles, anhydrous ethanol, acetonitrile, polyvinylpyrrolidone, deionized water and tetrabutyl titanate is (5~7.5)g : (750~900)mL : (100~200)mL : (0.5~1)g : (400~500)mL : (30~50)mL.

3. The method for preparing a display screen functional film according to claim 1, characterized in that, The heating and stirring are carried out at 55~65℃ for 12~14h; the annealing is carried out at 500~600℃ for 2~3h.

4. The method for preparing a display screen functional film according to claim 1, characterized in that, The ratio of SiO2@TiO2 particles, epoxy-containing silane coupling agent, and methanol is (5~7.5)g : (0.8~1)g : (250~350)mL.

5. The method for preparing a display screen functional film according to claim 1, characterized in that, The epoxy-containing silane coupling agent is one of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 3-[(2,3)-epoxypropoxy]propylmethyldimethoxysilane, trimethoxy[2-(7-oxabicyclo[4.1.0]hept-3-yl)ethyl]silane, and 3-glycidyl etheroxypropyltriethoxysilane.

6. The method for preparing a display screen functional film according to claim 1, characterized in that, The ratio of the modified SiO2@TiO2, 4,4'-diaminodiphenyl sulfone, leveling agent, and methyl isobutyl ketone is (3~6)g:(0.3~0.5)g:(0.01~0.03)g:(25~35)mL.

7. The method for preparing a display screen functional film according to claim 1, characterized in that, The coating thickness is 6~10μm; the drying process is carried out at 155~175℃ for 6~8h.

8. A display screen functional film, characterized in that, It is prepared by the preparation method according to any one of claims 1-7.

9. The application of the display screen functional film as described in claim 8 in a display screen.

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