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A kind of retardation film and its preparation method and application
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A retardation film and compound technology, applied in instruments, polarizing elements, optics, etc., can solve the problems of unsatisfactory optical retardation characteristics and high temperature resistance processing performance.
Active Publication Date: 2020-06-02
江苏创拓新材料有限公司
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Problems solved by technology
[0006] However, the optical retardation characteristics such as the optical retardation value Re of the above-mentioned retardation film and the high temperature resistance processing performance are still unsatisfactory.
Method used
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Embodiment 1
[0050] Embodiment 1: Preparation of polymerizable monomer compound
[0051] (1) in 200ml dichloromethane, add the formula (1-1) compound of 15.0g,
[0052]
[0053] 8.7g of 4-benzyloxyphenol, 0.8g of N,N-dimethyl-4-pyridinamine (DMAP), install the stirring, cooling bath and nitrogen protection device, start stirring, and control the temperature at about 0°C. Then, 30 ml of a dichloromethane solution of 10.7 g of dicyclohexanecarbodiimide (DCC) was added dropwise thereto. After the dropwise addition was completed, stirring was continued at room temperature for 18 hours, and a precipitate precipitated out. Filter, wash the organic layer with water, and dry over anhydrous magnesium sulfate. Dichloromethane was distilled off under reduced pressure. A 6:1 mixed solvent of toluene:ethyl acetate was used as the eluent to pass through a silica gel column to obtain a crude product, which was recrystallized from ethanol to obtain 14.6 g of intermediate 1 of the following formula (...
Embodiment 2
[0064] Embodiment 2: Preparation of polymerizable liquid crystal coating solution
[0065] Take by weighing the polymerizable monomer compound of embodiment 1 formula (I) and the polymerizable monomer compound of following formula (II-1)
[0066]
[0067] Among them, m and n are 6;
[0068] Polymerizable monomer compound of the following formula (III-1)
[0069]
[0070] Among them, o is 6.
[0071] The three form a polymerizable monomer composition according to a weight ratio of 20:60:40; then add solvent cyclohexanone and photoinitiator Irgacure 907 to form a polymerizable liquid crystal liquid. The weight ratio of the three is 21.5:78:0.5.
[0072] A retardation film was then produced in the following manner. First, the polymerizable liquid crystal coating solution was coated on the glass substrate with the liquid crystal alignment film by spin coating; heated at 70°C for 2 minutes using a heating plate; then kept at 50°C for 1 minute; then at room temperature Co...
Embodiment 3
[0073] Embodiment 3: Preparation of polymerizable liquid crystal coating solution
[0074] The polymerizable monomer compound of embodiment 2 formula (III-1) is replaced by the polymerizable monomer compound of the following formula (III-2):
[0075]
[0076] Among them, p is 6; q is 3.
[0077] The remaining conditions are the same as in Example 2, and finally the retardation film of Example 3 is obtained.
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Abstract
The invention discloses a phase difference film which is formed by polymerizable liquid crystal coating liquid. The polymerizable liquid crystal coating liquid is prepared from a polymerizable monomercomposition, photoinitiator, a solvent and optional additives; the polymerizable monomer composition comprises a compound of formula (I), at least one polymerizable monomer composition containing twopolymerizable groups and at least one polymerizable monomer composition containing one polymerizable group. The invention further discloses a phase difference film preparation method and application.The phase difference film can have the excellent optical delay characteristic, and meanwhile high-temperature-resistant treatment performance is improved. The wavelength dispersion of the phase difference film is low. Compared with the prior art, the optical delay Re value of 550 nm wavelength is small in change rate under high temperature.
Description
technical field [0001] The invention belongs to the field of optical thin films. Specifically, it relates to a retardation film and its preparation method and application. Background technique [0002] With the continuous development of liquid crystal display technology, people have higher and higher requirements for the performance of liquid crystal displays. However, liquid crystal displays have some inherent technical defects. For example, liquid crystal materials do not have self-luminous properties, resulting in low contrast of liquid crystal displays; in addition, the viewing angle is not high, usually only 130-140°. In order to improve the display performance of the display, it is not only necessary to improve the structure and driving mode of the liquid crystal display unit, but also to improve the optical film in the liquid crystal display. Among the optical films, the phase difference film controls the optical anisotropy through optical compensation, improves th...
Claims
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