Preparation method of moisture-proof konjac glucomannan packaging film
A konjac glucomannan and packaging film technology, which is applied in packaging, wrapping paper, biological packaging, etc., can solve the problems of complex chemical modification process, poor resistance to boiling water, and difficult control of the process, achieving good application prospects, Effects of improved moisture barrier performance, light transmittance and mechanical properties
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Embodiment 1
[0017] Preparation of deacetylated konjac glucomannan-based film: Slowly dissolve 1wt% KGM in distilled water under stirring, stir at room temperature for 3 hours and add 0.3wt% Na 2 CO 3 The solution was stirred for 10 minutes and then allowed to stand for 40 minutes to fully deacetylate to obtain deacetylated konjac glucomannan, marked as I.
[0018] After I was cast on a polystyrene plate, it was dried in an oven at 50°C for 6 hours.
[0019] The dried film was washed with running water and then with distilled water to remove the residual alkali in the film, and then the wet film was dried in air at room temperature to obtain a dry KGM base film.
[0020] Preparation of shellac and stearic acid composite coating: Dissolve 20wt% bleached shellac in 95% ethanol solution under stirring, after stirring evenly, add PEG400 accounting for 8wt% of the dry weight of shellac, and continue stirring for 40min. Quality 15-30min, obtain shellac paint.
[0021] Add 5wt% stearic acid in...
Embodiment 2
[0024] Preparation of deacetylated konjac glucomannan-based film: Slowly dissolve 0.5wt% KGM in distilled water under stirring, stir at room temperature for 2 hours and add 0.15wt% Na 2 CO 3 The solution was stirred for 5 minutes and then allowed to stand for 30 minutes to fully deacetylate to obtain deacetylated konjac glucomannan, marked as I. After casting I on a glass plate, dry it in an oven at 45°C for 4h. The dried film was washed with running water and then with distilled water to remove the residual alkali in the film, and then the wet film was dried in air at room temperature to obtain a dry KGM base film.
[0025] Preparation of shellac and stearic acid composite coating: Dissolve 6wt% bleached shellac in 95% ethanol solution under stirring, after stirring evenly, add PEG400 accounting for 6wt% of the dry weight of shellac, and continue stirring for 30min. Quality 15min, obtain shellac paint. 20wt% stearic acid was added to the shellac paint under stirring state,...
Embodiment 3
[0028] Preparation of deacetylated konjac glucomannan-based film: Slowly dissolve 1.5wt% KGM in distilled water under stirring, stir at room temperature for 4 hours and add 0.45wt% Na 2 CO 3 The solution was stirred for 15 minutes and then allowed to stand for 60 minutes to fully deacetylate to obtain deacetylated konjac glucomannan, marked as I.
[0029] After casting I on a Petri dish, dry it in an oven at 65°C for 10 hours. The dried film was washed with running water and then with distilled water to remove the residual alkali in the film, and then the wet film was dried in air at room temperature to obtain a dry KGM base film.
[0030]Preparation of shellac and stearic acid composite coating: dissolve 30wt% bleached shellac in 95% ethanol solution under stirring state, after stirring evenly, add PEG400 accounting for 12wt% of shellac dry weight, after continuing to stir for 60min, homogeneous Quality 30min, obtain shellac paint. Add 40wt% stearic acid into the shellac p...
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