Method for producing cellulose acetate flakes
A kind of technology of cellulose acetate and manufacturing method, applied in the manufacture field of cellulose acetate sheet, can solve problems such as inability to utilize, achieve the effect of excellent transparency
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[0117] Hereinafter, the present invention will be specifically described with examples, but the technical scope of the present invention is not limited by these examples.
[0118] The physical properties described in the examples described later were evaluated by the following methods.
[0119]
[0120] The degree of acetylation of cellulose acetate is determined by the method of measuring the degree of acetylation in ASTM-D-817-91 (Testing method for cellulose acetate etc.). After weighing out 1.9 g of dry cellulose acetate, dissolving it in 150 ml of a mixed solvent of acetone and dimethyl sulfoxide (volume ratio 4:1), adding 30 ml of 1N-sodium hydroxide aqueous solution, and saponifying at 25°C for 2 hours. Add phenolphthalein as an indicator, and titrate the excess sodium hydroxide with 1N-sulfuric acid (concentration factor: F). In addition, perform a blank test in the same way as above, and calculate the degree of acetylation according to the following formula;
[0121] Degre...
Embodiment 2
[0184] A cellulose acetate sheet was obtained in the same manner as in Comparative Example 1, except that instead of the step of adding 90 parts by weight of distilled water to 10 parts by weight of cellulose acetate, and adding 90 parts by weight of a 50% by weight aqueous acetic acid solution to 10 parts by weight of cellulose acetate. The recovery rate was 96%.
[0185] For the obtained cellulose acetate sheet, the degree of acetylation, 6% viscosity, number average molecular weight (Mn), weight average molecular weight (Mw), content of low molecular weight components having a molecular weight less than 1 / 4 of the peak molecular weight, and absorbance method were measured Hue. The results are shown in Table 1.
[0186]
[0187] A cellulose acetate slurry was obtained in the same manner as in Comparative Example 1, except that instead of adding 90 parts by weight of distilled water to 10 parts by weight of cellulose acetate, and adding 90 parts by weight of a 75% by weight aqueo...
Embodiment 3
[0189] Instead of adding 90 parts by weight of distilled water to 10 parts by weight of cellulose acetate, and adding 83 parts by weight of a 50% by weight acetone aqueous solution to 6 parts by weight of cellulose acetate, instead of washing the filter with 150 parts by weight of distilled water, the filter was used. A cellulose acetate sheet was obtained in the same manner as in Comparative Example 1 except for washing with 55 parts by weight of distilled water. The recovery rate is 98%.
[0190] For the obtained cellulose acetate sheet, the degree of acetylation, 6% viscosity, number average molecular weight (Mn), weight average molecular weight (Mw), content of low molecular weight components having a molecular weight less than 1 / 4 of the peak molecular weight, and absorbance method were measured Hue. The results are shown in Table 1.
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