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Cellulose triacetate film

A technology of cellulose triacetate and ester film, which is applied to other household appliances, coatings, flat products, etc., and can solve the problems of high crystal points of triacetate cellulose film, long grinding time of matting agent, and shortened service life of filter elements, etc. problems, to achieve the effect of reducing the ills of the crystal point, reducing the stirring frequency and prolonging the life of the filter element

Active Publication Date: 2017-05-24
CHINA LUCKY FILM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) The single mechanical stirring and dispersion of the matte agent takes a long time and the stirring frequency is high, resulting in large power consumption and high production cost
[0008] (2) The grinding time of the matte agent is long, the content of <10μm particles does not reach more than 95%, and the grinding efficiency is low
[0009] (3) The matting agent is easy to condense in the pipeline before filtration, and the content of particles > 10 μm increases, resulting in shortened service life of the filter element and increased enterprise costs
[0010] (4) The triacetate cellulose film prepared by the above method has defects such as many crystal points, high haze, and low transmittance, which cannot meet the production requirements, and the storage period is short, which is not conducive to storage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] The preparation of cellulose triacetate cotton glue solution mainly includes three processes of cotton glue solution preparation, cotton glue solution filtration and constant temperature static defoaming.

[0034] (1) Cotton Glue Preparation

[0035] First, add the mixed solvent and additives to the reaction kettle, turn on the stirring device of the reaction kettle and the temperature control device of the jacket water, effectively control the speed range, and mix evenly. Secondly, mix the cellulose triacetate and the broken film according to the formula ratio and add them to the reaction kettle containing the mixed solvent and additives; adjust the stirring speed, jacket water temperature and other dissolution process parameters to dissolve the cellulose triacetate , the dissolution time was 6h, and a uniform and transparent cellulose triacetate cotton glue solution was prepared.

[0036] (2) Filtration of cotton glue solution

[0037] Cotton glue liquid is usually ...

Embodiment 1

[0048]

[0049] Take 10Kg of cellulose triacetate, 5Kg of cosolvent, and 0.5Kg of plasticizer, add them into 50Kg of mixed solvent and fully dissolve them to prepare a cotton glue solution for future use. Add 1.5Kg of matting agent into the dispersion tank containing dilute cotton gum 1, and use ultrasonic device 2 and mechanical agitation to disperse and process for 30 minutes to obtain a dispersion. Wherein, frequency of ultrasonic device 2: 40KHz, frequency of mechanical stirring: 35Hz. Put the dispersion liquid into the ball mill 3 for grinding treatment, the time is 100 min, the particle content of <10 μm: 99.8%, to obtain the grinding liquid. After being ultrasonicated by the pipeline of the second ultrasonic device 6, part of the grinding liquid returns to the storage tank 7 through the return pipeline 10 at a certain flow rate, and part of it enters the filter 9 through the ultrasonic pipeline 8 to be filtered. The frequency of the second ultrasonic device 6 is 10K...

Embodiment 2

[0051] The difference from Example 1 is that the dispersing time of the matting agent dispersion liquid is 25min, the frequency of the ultrasonic device 2 is 50KHz, and the mechanical stirring frequency is 20Hz. The processing time of the grinding liquid is 110 minutes, the particle content of <10 μm: 99.9%, the frequency of the second ultrasonic device 6: 20KHz, the flow rate of the ultrasonic pipeline 8: 15L / h, and the flow rate of the return pipeline 10: 10L / h. Put it in the storage room after being rolled into a shaft, and moisture absorption will appear after 17 days. The test data of the above-mentioned thin film products are shown in Table 1.

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Abstract

The invention relates to a cellulose triacetate film. Preparation steps comprise preparation of a cellulose triacetate celloidin liquid, dispersion and addition of a matting agent and tape casting, wherein in the dispersion and addition link of the matting agent, the matting agent is mixed and dispersed through ultrasonic cavitation and mechanical stirring, the dispersing time and the grinding time of the matting agent are effectively shortened by means of a method of controlling a flow rate of a pipeline, an agglomeration phenomenon in the matting agent adding process is avoided, and in the dispersion liquid adding process, the content of particles, less than 10 [mu]m, of the matting agent is stabilized to 99.5% above, so that the service life of a filter element is effectively prolonged, and the cost is lowered. Compared with the prior art, the cellulose triacetate film prepared by the invention has the advantages of being low in haze, high in light transmittance, few in crystal points, few in moisture absorption points and the like.

Description

technical field [0001] The invention relates to a cellulose triacetate film, in particular to a cellulose triacetate film which is mixed with ultrasonic cavitation and mechanical stirring to disperse a matting agent, and prevents the agglomeration of the matting agent by controlling the pipeline flow velocity. Background technique [0002] In recent years, cellulose triacetate films have been widely used as supports and protective films for polarizers due to their excellent optical and physical properties in various display devices of liquid crystal displays that have become increasingly popular. [0003] Cellulose triacetate films are usually produced by solution casting. It is to dissolve cellulose triacetate in a solvent to form a polymer solution (hereinafter referred to as cotton glue). After filtering, use a casting mold to discharge the cotton glue onto the casting support. When the casting film on the support has the After supporting, peel the casting film from the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C41/28B29C41/36B29C41/34C08J5/18C08L1/12B29L7/00
CPCB29C41/28B29C41/34B29C41/36B29L2007/00C08J5/18C08J2301/12
Inventor 马海军王秋玲杜彦飞孙晓龙
Owner CHINA LUCKY FILM CORP
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