Preparation method of potato starch-based degradable plastic film

A technology of potato starch and plastic film, applied in the direction of flat products, applications, household appliances, etc., can solve the problems of little research, achieve the effects of changing damage and impact, wide application range, and improving tensile strength

Active Publication Date: 2015-01-21
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some domestic researchers have made achievements in the research of many starches such as corn starch, tapioca starch and vinyl acetate graft copolymerization to prepare polymer materials, and successfully produced biodegradable and good performance adhesives and other products, but for Potato Starch-Vinyl Acetate Graft Copolymerization Has Few Researches

Method used

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  • Preparation method of potato starch-based degradable plastic film
  • Preparation method of potato starch-based degradable plastic film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare the polyvinyl acetate emulsion according to the method of the present invention in advance: the initiator that the vinyl acetate emulsion adopts is ammonium persulfate, protective colloid is polyvinyl alcohol, emulsifier is anionic emulsifier sodium lauryl sulfate and nonionic Emulsifier Tween-80 and system. Reacting while stirring at a temperature of 70-80° C., a milky white product with a solid content of 25% to 30% and a viscosity of 600 to 700 mpa·s is obtained.

[0029] Prepare the polyvinyl alcohol solution in advance according to the method of the present invention: add deionized water into the container, start the mixer, and then throw in polyvinyl alcohol with a degree of polymerization of 1700 and a degree of alcoholysis of 99%. The weight of the polyvinyl alcohol and water The ratio is 1:9, heat up to 90-95°C and keep it warm for 1h, then cool to room temperature.

[0030] The specific process of preparing potato starch-based degradable plastic film ...

Embodiment 2

[0032] Prepare polyvinyl acetate emulsion according to the method of the present invention in advance: the initiator that prepares vinyl acetate emulsion adopts is ammonium persulfate, and protective colloid is polyvinyl alcohol, and emulsifier is anionic emulsifier sodium lauryl sulfate and nonionic Emulsifier Tween-80 and system. Reacting while stirring at a temperature of 70-80° C., a milky white product with a solid content of 25% to 30% and a viscosity of 600 to 700 mpa·s is obtained.

[0033] Prepare the polyvinyl alcohol solution in advance according to the method of the present invention: add deionized water into the container, start the mixer, and then throw in polyvinyl alcohol with a degree of polymerization > 1700 and a degree of alcoholysis of 99%. The weight of the polyvinyl alcohol and water is The ratio is 1:9, heat up to 90-95°C and keep it warm for 1.5h, then cool to room temperature.

[0034]The specific process of preparing potato starch-based degradable p...

Embodiment 3

[0035] Embodiment 3 performance test

[0036] The plastic film made by embodiment 1 and 2 is made stretchability and water resistance test respectively:

[0037] (1) Water resistance test

[0038] Water resistance is reflected by the water absorption rate of the plastic film. The lower the water absorption rate, the better the water resistance. The test method for water absorption rate is: cut a sample with a size of 50cm×50cm, weigh it as m1, and place it in clean tap water at room temperature Soak for 24 hours, take out the sample and dry it with filter paper and weigh it as m2. For each sample to be tested, 3 samples were taken for measurement, and the results were averaged. The calculation formula of water absorption η is:

[0039] η = ( m 2 - m 1 ) m 1...

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Abstract

The invention discloses a preparation method of a potato starch-based degradable plastic film. The preparation method of the potato starch-based degradable plastic film comprises the following steps: mixing 60-80 parts of potato starch and 300-400 parts of deionized water to form a starch aqueous solution, and pasting at the temperature of 85-90 DEG C; at the temperature of 60-70 DEG C, adding 3-4 parts by weight of an initiating agent, stirring for 15 minutes, and then adding 120-180 parts of vinyl acetate and 8-12 parts of acrylic amide and reacting for 2-2.5 hours to obtain grafted copolymer emulsion; then adding 30-40 parts of a 10% poly(vinyl alcohol) solution and 10-20 parts of a 4% epoxy chloropropane solution into the grafted copolymer emulsion, reacting at the temperature of 60-70 DEG C for 1.5-2 hours, carrying out suction filtration at reduced pressure, and drying to obtain a solid mixture, carrying out hot melting extrusion-blown molding on the solid mixture by virtue of a single screw extrusion film blowing machine to obtain a plastic film, and finally cutting, carrying out roll dividing, and packaging. The prepared plastic film has good water resistance and biodegradability.

Description

technical field [0001] The invention relates to the technical field of biodegradable materials, in particular to a method for preparing a degradable plastic film by modifying potato starch. Background technique [0002] With the rapid development of plastic industry technology, the increasing number of plastic products has brought a near-destructive disaster to the environment; a large amount of plastic waste is abandoned in the social environment, and the "white pollution" produced has become the most difficult problem in various countries. . However, the control of "white pollution" from the consumer terminal has little effect. To fundamentally solve the environmental pollution problem of waste plastics, degradable and easily degradable plastic products should be used instead of existing plastic products. [0003] Aliphatic polyesters and their copolymers in degradable plastics have good biodegradable properties and excellent mechanical strength, however, their production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08L29/04C08L3/04C08K5/1515C08F251/00C08F220/56C08F218/08B29D7/01C08B30/12
Inventor 陈理军
Owner GUANGXI UNIV
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