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Cellulose acetate

A technology of cellulose acetate and sulfuric acid, which is applied to artificial filaments made of cellulose derivatives, pulping with acid salts/acid anhydrides, and pretreatment with acid compounds, etc., can solve problems such as easy thread breakage

Active Publication Date: 2019-01-11
DAICEL CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, in the case of cellulose acetate fibers with a small fiber diameter such as used in tobacco filters, the pores of the spinning nozzle are also small in diameter, which tends to cause thread breakage during the spinning process.

Method used

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  • Cellulose acetate
  • Cellulose acetate
  • Cellulose acetate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0129] After the Kraft process dissolving pulp as a cellulose raw material is crushed into fluff, it is dried to a moisture content of about 6%. 31 parts of glacial acetic acid was added to 100 parts of this dry fluffy pulp, and pretreatment activation was performed for 1 hour. The cellulose that has been pretreated and activated is put into the stirring acetylation reactor, and at the same time, a mixed solution of 270 parts of acetic anhydride as the acetylation reagent and 330 parts of acetic acid as the reaction solvent is added. Thereafter, 30 parts of a first-stage catalyst liquid (3% sulfuric acid acetic acid solution) was added over 0.5 minutes to start the reaction. The time at which the addition of the catalyst solution was started was defined as 0 minutes, which was used as a reference time thereafter. The temperature of the reaction system rose rapidly and reached 55° C. after about 5 minutes, so it was adjusted so that the temperature would be constant thereafter...

Embodiment 2-10 and comparative example 1-8

[0132] Cellulose acetate was obtained in the same manner as in Example 1 except that the stabilizers shown in Table 1 were used instead of calcium hydroxide having a concentration of 0.0027% by weight as the stabilizers. In addition, under the condition of using both calcium hydroxide and magnesium acetate, calcium hydroxide and magnesium acetate were added as follows: With respect to 100 parts by weight of cellulose acetate obtained by precipitation, 2 parts by weight were added as stabilizers. Magnesium acetate was added continuously after calcium hydroxide. For the obtained cellulose acetate, the calcium and magnesium contents, the amount of residual sulfuric acid, the stoichiometric ratio of the calcium content to the amount of residual sulfuric acid [Ca / H 2 SO 4 ] and the stoichiometric ratio of magnesium content relative to the amount of residual sulfuric acid [Mg / H 2 SO 4 ], degree of acetylation, wet heat stability, and disconnection, and the evaluation results are ...

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Abstract

The purpose of the present invention is to provide a cellulose acetate which has excellent hygrothermal stability and which can have reduced yarn breakage in a spinning step. The cellulose acetate satisfies a relationship represented by formula (1) between the chemical equivalent ratio [Ca / H2SO4] of the calcium content to the amount of remaining sulfuric acid, and the chemical equivalent ratio [Mg / H2SO4] of the magnesium content to the amount of remaining sulfuric acid. [Mg / H2SO4] > 0, [Ca / H2SO4] > 0, and (2.70 - [Mg / H2SO4]) / 1.62 <= [Ca / H2SO4] <= (37.7 - [Mg / H2SO4]) / 10.3 (1).

Description

technical field [0001] The present invention relates to cellulose acetate. Background technique [0002] Among cellulose acetates, cellulose triacetate has high optical isotropy and is excellent in toughness and flame retardancy, so it is used as various printing materials, optical films, and the like. In addition, cellulose diacetate is used in tobacco filters and the like as cellulose acetate fibers. Cellulose acetate fibers can generally be produced by dry spinning as follows, that is, after the spinning dope in which cellulose acetate is dissolved in a soluble solvent is sprayed from the spinning nozzle, the solvent is evaporated with hot air and solidified into Fibrous. In particular, in the case of cellulose acetate fibers with a small fiber diameter used in tobacco filters, the pores of the spinning nozzle are also small in diameter, and thread breakage tends to occur during the spinning process. [0003] Regarding thread breakage in such a spinning step, Patent Do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B3/06
CPCC08B3/06C08L1/12C08B3/28C08B3/30D21C1/04D21C3/04D21C3/26D01F2/28
Inventor 松村裕之高桥庆多
Owner DAICEL CHEM IND LTD