CN1248593A

CN1248593A - Non-toxic degradable film for package

Info

Publication number: CN1248593A
Application number: CN 98112640
Authority: CN
Inventors: 袁寿南
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-09-21
Filing date: 1998-09-21
Publication date: 2000-03-29
Anticipated expiration: 2018-09-21
Also published as: CN1105745C

Abstract

The non-toxic degradable packaging film relates to a vinyl resin film. Said film is formed from polyvinyl acetate and edible gelatin, and its production process includes the following steps: heating polyvinyl acetate with ethyl alcohol for alcoholysis, after it is precipitated and separated out, filtering, then repeatedly washing fiter residue with ethyl alcohol to remove impurity, then drying and diluting with water, steaming with steam until the solution becomes transparent, adding edible gelatin, cooling, and high-pressure spraying and forming to obtain the invented non-toxic degradable transparent packaging film with heat-resistance and cold-resistance. It is suitable for packaging food.

Description

Non-toxic degradable film for package

The present invention relates to wrapping resene film.

Current, film is widely used in all trades and professions, and still, partly plastic class film is difficult for degraded, and environment is caused severe contamination, and the part film is poisonous, can not be used for food product pack.The disclosed packaging film of Chinese patent ZL87104845 and ZL89101322, not only nontoxic, and can be fresh-keeping, still, the material complexity that the production of these films is used; The present invention is intended to select a kind of material, and both degradeds easily are nontoxic again and meet the performance requriements of packaging film.

The present invention realizes that the technical scheme of above-mentioned purpose is as follows: polyvinyl acetate (PVA), ethanol and sulfuric acid also fully stir evenly with 20: 100: 1 mixed, be heated to boiling, alcoholysis 8～20 hours, sulfate radical content is 1%～1.5% to separate out the finely powdered precipitation to the mixed solution, filter through 200 order copper wire screen, filter residue is with 70～80% ethanol repetitive scrubbing removal of impurities, dry under 45～50 ℃ of temperature condition, every part of dry thing is converted ten parts in water, fully stirs, with steam boiling 40-50 minute, treating that complete soln presents stops boiling when transparent, adds the edible Gelatinum oxhide of total amount of liquid 8-10% then, constantly is stirred to gelatin and all dissolves, be cooled to room temperature, the high-pressure spraying moulding.

The polyvinyl acetate resins latex milk sap that is white in color, the resin water white transparency after the curing, good toughness, emulsion is dispersion medium with water, it is low, nontoxic, easy to use to have a cost; And odorless, tasteless, clinging power is strong, anti-diluted acid, diluted alkaline.The add-on of edible Gelatinum oxhide is wanted suitably, and the gelatin amount is too much, and viscosity is strong, takes off the film difficulty; The gelatin amount is very few, the film forming difficulty; Through test, the add-on of gelatin is advisable with 8～10%.Non-toxic degradable film for package of the present invention has barrier, can prevent oxygen, the infiltration of water vapour and liquid; Have thermotolerance, can bear 100-110 ℃ of thermal radiation; Tool winter hardiness, under-10 ℃ of temperature condition freezing 72 hours continuously, no qualitative change phenomenon; Heat sealing property is good; Anti-diluted acid, diluted alkaline.Suitable packaging film, the especially food product packing film done.

Embodiment:

The polyvinyl acetate (PVA) of 20 kilogram of 97% content, after 100 kilograms of 98% sulfuric acid with 1 kilogram of 99% dehydrated alcohol mix, stir, be heated to boiling then, alcoholysis 12 hours, making the sulfate radical content in the mixed solution is 1%, at this moment, have thin shape precipitation to separate out, filter, filter residue with 75% ethanol repetitive scrubbing removal of impurities after, dry under 45～50 ℃ temperature condition, dry thing and water fully stir evenly with 1: 10 ratio, and steam boiling 50 minutes is when treating that complete soln is transparent, stop to heat, add 8% edible Gelatinum oxhide of solution total amount then, constantly be stirred to the gelatin off-bottom, be cooled to room temperature, at last, high-pressure spraying moulding.

Claims

1, a kind of non-toxic degradable film for package, it is characterized in that this film is by polyvinyl acetate (PVA), two kinds of materials of edible Gelatinum oxhide are formed, with polyvinyl acetate (PVA), dehydrated alcohol and 98% sulfuric acid with 20: 100: 1 mixed after, stir, be heated to boiling then, alcoholysis 8～20 hours, make that sulfate ion content is 1～1.5% in the mixed solution, separate out the finely powdered precipitation, filter through 200 mesh sieves, filter residue is removed behind the impurity dry under 45～50 ℃ temperature condition with the ethanol repetitive scrubbing of 70～80% concentration, dry thing and water were with 1: 10 dilution proportion and stir, and uses steam boiling then 40～50 minutes, treat that complete soln is transparent promptly stopping and heats, add 8～10% edible Gelatinum oxhide of solution total amount again, constantly be stirred to the gelatin off-bottom, treat that solution is cooled to the moulding of room temperature high-pressure spraying.