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Polymer purifying method and facility, solution film forming method and facility, and flocculent and granular deposited polymer

A technology of polymer solution and purification method, which is applied in the field of flocculent and granular precipitated polymers to achieve the effects of efficient production, continuous polymer purification, and fewer foreign matter failures

Active Publication Date: 2014-02-19
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stock solution in this replacement is a mixture of old and new stock solutions, and cannot be used as a product and is discarded.

Method used

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  • Polymer purifying method and facility, solution film forming method and facility, and flocculent and granular deposited polymer
  • Polymer purifying method and facility, solution film forming method and facility, and flocculent and granular deposited polymer
  • Polymer purifying method and facility, solution film forming method and facility, and flocculent and granular deposited polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0244] Table 1 below shows the results of comparing precipitated CA (Example 1) purified by the method of the present invention with conventionally used raw material CA (Comparative Example 1). In Example 1, the solubility limit (solid content concentration) when cellulose acylate was dissolved in a mixed solvent of dichloromethane and methanol (methanol) was investigated, and about 17% was the limit in Comparative Example 1, and it was about 17% in Example 1. 24%, thus judging that the solubility limit was increased. In addition, as an essential process, the step of heating and concentrating was necessary in Comparative Example 1, but this step was not required in Example 1, and it could be achieved only by dissolution using a dissolution tank. In the subsequent casting step, both Example 1 and Comparative Example 1 were cast at a solid content concentration of about 20%.

[0245] [Table 1]

[0246]

Embodiment 2

[0248] by image 3 The equipment shown above casts the casting stock solution of Example 1 and the casting stock solution of Comparative Example 1 (both with a solid content concentration of about 20%) to obtain a film. Regarding the film obtained from the casting stock solution of Example 1 (Example 2), the film obtained from the casting stock solution of Comparative Example 1 without filtrate (Comparative Example 2), and the film of Comparative Example 1 For each size of the foreign matter, 1 square millimeter (mm) (mm 2 ) in the number of foreign objects.

[0249] When investigating the respective numbers per unit area of ​​small-sized foreign matter of less than 10 μm, medium-sized foreign matter of 10 μm or more and less than 30 μm, and large-sized foreign matter of 30 μm or more, in the unfiltered stock solution of Comparative Example 2, the raw material The foreign matter contained in CA appeared directly in the product, about 5 small-sized foreign matter, about 30 me...

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Abstract

The invention relates to a polymer purifying method and facility, a solution film forming method and facility, and a flocculent and granular deposited polymer. In a dissolving box, a raw material of acylation cellulose (CA) is dissolved in methylene dichloride to form a thin stoste with 7% polymer concentration. The thin stoste is filtered by a filter. Hot water heated to be hotter above a boiling point of methylene dichloride is put in a separator. The thin stoste is sprayed on the hot water inside the separator via a first nozzle. Methylene dichloride of the thin stoste contacted with the hot water evaporates, and then acylation cellulose is separated. The acylation cellulose (CA) is separated from the water, and hot water contained in the cellulose is extruded out. Then, the separated acylation cellulose is dried by a vibration dryer. The acylation cellulose is obtained through the thin stoste dissolved in a solution, so the separated acylation cellulose with excellent dissolvability through utilization of a solution can be obtained.

Description

technical field [0001] The invention relates to a polymer purification method and equipment, a solution film forming method and equipment, and flocculating and granular precipitated polymers. Background technique [0002] A light-transmitting thermoplastic film is used in various fields as an optical film because it is light in weight and easy to shape. Among them, cellulose acylate-based films such as cellulose acylate (cellulose acylate) are used, represented by photographic photosensitive films, and are used in optical films (such as phase films) as components of liquid crystal display devices that are expanding in market in recent years. poor film or polarizer protective film, etc.). [0003] The membrane is produced by a solution membrane method. In the solution film forming method, a polymer solution (flow casting dope) containing a polymer and a solvent is made to flow on a support to form a cast film. Next, after the cast film is conveyable, the cast film is peele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B3/22C08J5/18
CPCB29C41/28B29D7/01C07C37/84C08B3/16
Inventor 横山和正鹫谷公人下田泰久笠原诚治
Owner FUJIFILM CORP
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