Preparation method of cellulose triacetate ester film

A technology of cellulose triacetate and ester film, applied in flat products, applications, coatings, etc., can solve the problems of apparent quality influence, crystal point defects, affecting optical properties, etc., to improve uniformity and solve crystal point problems , the effect of improving the appearance and optical properties

Active Publication Date: 2015-09-16
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

[0024] The production process of the raw material - partially hydrolyzed cellulose triacetate - determines that the raw material itself contains 1% - 3% residual moisture, which can promote the dissolution of the raw material cellulose triacetate However, moisture will have a great impact on the apparent quality of the final finished film—cellulose triacetate film—especially a large number of crystal points, which will affect its optical properties. Therefore, it is necessary to find a method to eliminate residual moisture. The method that brings crystal point disadvantages

Method used

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preparation example Construction

[0037] The preparation method of cellulose triacetate film of the present invention is:

[0038] 1. Drying treatment of cellulose triacetate

[0039] The raw material cellulose triacetate with a moisture content of 1%-3% is heated and dried at a wind temperature of 50-130°C, and the moisture content of the treated cellulose triacetate is ≤0.3% by weight.

[0040] 2. Methanol rewetting of cellulose triacetate

[0041] The cellulose triacetate treated in step 1 enters the methanol vapor, and the cellulose triacetate treated in step 1 is rehumidified in the methanol vapor, so that the methanol content of the treated cellulose triacetate reaches 0.1 -2% by weight.

[0042] 3. Preparation of cellulose triacetate cotton glue solution

[0043] The preparation process of the cellulose triacetate cotton glue of the present invention is the same as that of the existing cellulose triacetate cotton glue, including four steps of feeding, mixing and dissolving, filtering and standing at ...

Embodiment 1

[0062] 1. Drying treatment of cellulose triacetate

[0063] The cellulose triacetate with a moisture content of 2.0% is dried in the drying device 7 .

[0064] Air temperature 50 ℃ in drying device 7.

[0065] The water content of the treated cellulose triacetate was 0.3% by weight.

[0066] 2. Methanol rewetting of cellulose triacetate

[0067] The cellulose triacetate treated in step 1 is rehumidified in the cellulose triacetate methanol rehumidification device 8, so that the methanol content of the treated cellulose triacetate is 2% (by weight).

[0068] 3. Dissolution of cellulose triacetate

[0069] Add the cellulose triacetate treated in step 2 into the dissolving device 1 containing the main solvent, co-solvent and plasticizer for 5 hours to fully dissolve to prepare a uniform cotton glue solution. Test the dissolution quality of the cotton glue solution.

[0070] 4. Tape casting of cellulose triacetate film

[0071] After the cotton glue liquid obtained in proces...

Embodiment 2

[0073] 1. Drying treatment of cellulose triacetate

[0074] The cellulose triacetate with a moisture content of 2.0% is dried in the drying device 7 .

[0075] Air temperature in drying device 7 is 130°C.

[0076] The moisture content of the treated cellulose triacetate was 0.

[0077] 2. Methanol rewetting of cellulose triacetate

[0078] The cellulose triacetate treated in step 1 is rehumidified in the cellulose triacetate methanol rehumidification device 8, so that the methanol content of the treated cellulose triacetate is 1% by weight.

[0079] 3. Dissolution of cellulose triacetate

[0080] Add the cellulose triacetate treated in step 2 into the dissolving device 1 containing the main solvent, co-solvent and plasticizer for 5 hours to fully dissolve to prepare a uniform cotton glue solution. Test the dissolution quality of the cotton glue solution.

[0081] 4. Tape casting of cellulose triacetate film

[0082] After the cotton glue liquid obtained in process 3 is f...

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Abstract

The invention relates to a preparation method of a cellulose triacetate ester film. The preparation method comprises the following steps: preparation and tape casting of cellulose triacetate ester collodion, wherein the preparation process of the cellulose triacetate ester collodion comprises the steps of feeding, mixed dissolving, collodion filtering and constant-temperature standing and bubble removing; before feeding, cellulose triacetate ester is subjected to drying treatment and pre-humidification treatment. According to the invention, the homogeneity of the cellulose triacetate ester collodion is enhanced; the problem of crystal point of the surface of the cellulose triacetate ester film is solved; the apparent and optical performances are improved, and the cellulose triacetate ester film can act as a supporter and a protective film of a polaroid.

Description

technical field [0001] The invention relates to a preparation method of cellulose triacetate film. Background technique [0002] Among various display devices of liquid crystal displays that have become popular in recent years, cellulose triacetate films are widely used as supports and protective films for polarizers due to their excellent optical and physical properties. [0003] The cellulose triacetate film is prepared by dissolving partially hydrolyzed cellulose triacetate as a raw material in a mixed solvent to prepare a cotton glue solution. The prepared cotton-glue solution is cast onto a continuously running stainless steel belt to form a liquid film with uniform thickness, and the liquid film is dried, stripped, trimmed, embossed, and rolled to obtain a cellulose triacetate film. [0004] The dissolution quality of the cotton glue determines the apparent quality of the cellulose triacetate film. [0005] The production process of existing cellulose triacetate film...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C41/46B29C41/28B29D7/01C08J5/18C08L1/12
CPCB29C41/28B29C41/46B29D7/01C08J5/18C08L1/12
Inventor 王秋玲杜彦飞刘保军孙晓龙
Owner 乐凯光电材料有限公司
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