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Cellulose triacetate thin film and polarizer

A technology of cellulose triacetate and cellulose ester, which is applied in the direction of optics, optical components, polarizing components, etc., to achieve stable performance, better appearance and improved crystal point problems

Active Publication Date: 2018-08-03
乐凯光电材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual production, in order to obtain a dispersion with uniform and stable properties, it is not possible to rely solely on particles with a certain initial particle size.

Method used

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  • Cellulose triacetate thin film and polarizer
  • Cellulose triacetate thin film and polarizer
  • Cellulose triacetate thin film and polarizer

Examples

Experimental program
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preparation example Construction

[0027] The preparation of cellulose triacetate film, including the steps of preparation of cotton glue solution, casting, drying and winding, will be described in detail below with reference to the accompanying drawings.

[0028] 1. If figure 1 Proceed to the preparation of the cotton glue solution as indicated.

[0029] Mix and dissolve

[0030] The accurately weighed organic solvent is prepared as a mixed solvent and sent to the mixing kettle 1. Mixed solvent comprises one or more in methylene chloride and methyl alcohol, ethanol, acetone, the mixed solvent of preferred methylene chloride and methyl alcohol of the present invention, the amount of mixed solvent is preferably accounted for 70-85% of cotton glue solution 27, further Preferably dichloromethane:methanol is 90:10.

[0031] Then, the cellulose triacetate particles are put into the mixing tank 1 , the amount of the cellulose triacetate particles is preferably 10-20% of the cotton gum solution 27 .

[0032] Then,...

Embodiment 1

[0063] like figure 1 As shown, in the mixing tank 1, 70% by weight of mixed solvent, 20% by weight of cellulose triacetate particles, 7% by weight of TPP and BDP plasticizer mixture, 2.99% by weight of UV928 and UV329 UV absorber mixture. Stir the above mixture at a constant speed for 20 minutes to obtain the initially dissolved cotton glue solution 2, heat the cotton glue solution 2 at 80°C and pressurize at 0.5MPa for 10 minutes, drop to normal temperature and pressure and continue to dissolve for 20 minutes. The control temperature of the cotton glue solution 2 transported by the pipeline 9 is 32° C., and the temperature difference is 0-0.5° C. The cotton glue solution 2 is filtered three times and then enters the thermostat 15 to stand still for defoaming, and then transported to the front end of the casting nozzle 28 to be mixed with the matting agent dispersion 17.

[0064] like figure 2 As shown, a small amount of cotton glue solution 2 and a mixed solvent are put i...

Embodiment 2

[0067] The TAC film preparation process is as in implementation 1, the difference is that in the mixing tank 1, drop into 75% by weight of the mixed solvent, drop into 15% by weight of cellulose triacetate particles, 5.95% by weight of TPP and BDP for plasticization Agent mixture, 4% by weight of UV928 and UV329 UV absorber mixture. Heat the initially dissolved cotton glue solution 2 at 90° C. and pressurize at 0.3 MPa for 20 minutes. The temperature of the cotton glue solution 2 in the delivery pipeline 9 is controlled to be 34°C, and the temperature difference is 0-0.3°C.

[0068] The specific surface area is 110m 2 / g of R972 is added to the diluted cotton glue solution to make dispersion 17, and is sent to dispersion device 21 (sand mill), and the matting agent in dispersion 17 is dispersed into an average particle diameter of 0.6 micron, and the dispersion The liquid a filter 23 filters the dispersion liquid 17, and the particles of the dispersion liquid matte agent with...

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Abstract

The invention provides a cellulose triacetate thin film. A preparation process comprises the following steps: firstly, preparing a cotton gum solution; adding a mixed solvent, cellulose triacetate andan additive into a mixing kettle, mixing and stirring, and heating and pressurizing; carrying out temperature control and filtering on the conveyed cotton gum solution; uniformly mixing a dispersed matting agent and the cotton gum solution; then carrying out casting, drying and rolling to prepare the cellulose triacetate thin film; heating the cotton gum solution in the mixing kettle to 80 to 100DEG C and pressurizing for 20 to 30min until the pressure is 0.2 to 0.5MPa; controlling the temperature of the cotton gum solution in a conveying pipeline to 32 DEG C to 36 DEG C, wherein the temperature difference is 0 to 1.0 DEG C. According to the cellulose triacetate thin film, the average grain diameter and quantity distribution of the matting agent are controlled, so that a condition that apoint-shaped defect is caused in a TAC film when large particles are added is avoided; the performance of a dispersion solution is more stable and the average grain diameter stabilizing time is prolonged to 50 days or more from 1 day, so that a phenomenon that the dispersion solution goes bad when a vehicle is stopped for a long time is avoided.

Description

technical field [0001] The invention relates to a film, in particular to a cellulose triacetate film with excellent appearance, good lubricity and anti-blocking performance between films, and a polarizer for liquid crystal display made of the film. Background technique [0002] Cellulose acetate with an average degree of esterification of 57.5-62.5% is generally called triacetate cellulose, and the triacetate cellulose film (hereinafter referred to as TAC film) made of it is used as a photosensitive material because of its strength and flame retardancy. support body. At the same time, due to the excellent optical isotropy of TAC film, this film is suitable for polarizer protective film or anti-glare film for liquid crystal display, anti-reflection film, phase difference film and other functional films and their base films. The market is expanding rapidly. . [0003] The preparation of TAC film usually adopts the solution casting method, that is, the partially hydrolyzed ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L1/12G02B1/04G02B5/30
CPCC08J5/18C08J2301/12G02B1/04G02B5/30
Inventor 谢芸刘世军王力任孙晓龙
Owner 乐凯光电材料有限公司
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