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Prepn of domestic packing film of corn starch

A technology of corn starch and packaging film, applied in the biological field, can solve the problems of plastic film discarding, environmental pollution, complex process, etc., and achieve the effects of good acid and alkali resistance, no environmental pollution, and good light transmission

Inactive Publication Date: 2002-12-11
JIAYING SCI & TECH DEV WUHAN
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Problems solved by technology

[0002] As we all know, the popular living packaging films currently on the market are mainly polyethylene or polyvinyl chloride plastic films. Since these plastic films are difficult to be decomposed by soil microorganisms and absorbed by plant systems, a large number of plastic films are discarded in the environment after long-term use, causing environmental pollution. create pollution
For this reason, people try to improve the performance of life packaging film through different methods, but none of them can fundamentally solve the problem of biodegradability of plastic film.
Moreover, the existing film-forming method is to cast the glue solution into a saturated sodium sulfate solution. After the film is formed by this method, it will be washed with water in a long process. The process is complicated, and the residual inorganic salts in the washing solution are discharged, which causes environmental pollution. defect

Method used

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Embodiment Construction

[0007] With reference to specific examples, the preparation method of corn starch living packaging film involved in the present invention is described in detail as follows: First, in a 5l reaction vessel, 2.5l tap water, 15g plasticizer glycerol and plasticizer Add 40ml of diethanol, while stirring, add 300g of corn starch and heat to 70°C. After the contents of the container become a paste, continue to heat up to 90°C to make a transparent starch glue solution, and add acetic anhydride after a little cooling 30ml, the concentration of starch glue solution is 12%; secondly, put 200g of PVA into a 2l reaction vessel, then pour 1.5l of boiling water into it, and continue to heat and boil in the boiling water bath (container) until the PVA is dissolved into a transparent PVA glue solution , It takes about 1 hour, the concentration of the PVA glue is 14%, ready for use; third, pour the full amount of the transparent PVA glue into the starch glue, and then stir and mix the starch / PVA m...

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Abstract

The present invention belongs to the biotechnology field and aims at providing one kind of domestic packing film capable of being degraded completely. The packing film is produced with corn starch asmain material and degradable polyvinyl alcohol and other supplementary material and through the steps of making colloid, mixing, crosslinking, drying to form film, film surface treatment, etc. The said process can produce domestic packing film with excellent performance for application widely in light industry, food product, daily used article and other packing fields.

Description

Technical field [0001] The invention relates to a manufacturing method of a biodegradable life packaging film, in particular to a preparation method of a natural product corn starch life packaging film, and belongs to the field of biotechnology. Background technique [0002] As we all know, the popular living packaging films on the market are mainly polyethylene or polyvinyl chloride plastic films. Since these plastic films are difficult to be decomposed by soil microorganisms and absorbed by plant systems, a large amount of plastic films are discarded in the environment after long-term use. create pollution. For this reason, people try to improve the performance of life packaging film through different methods, but none of them can fundamentally solve the problem of biodegradability of plastic film. Moreover, the existing film forming method is to cast the glue into a saturated sodium sulfate solution. After the film is formed by this method, a long water ...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L99/00
Inventor 汤家芳郑正炯鲁军良
Owner JIAYING SCI & TECH DEV WUHAN
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