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Starch-based degradable film and preparation method thereof
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A starch-based, degradable film technology, applied in the field of biodegradable starch-based film materials, to achieve the effect of strong operability, good economic benefits, and easy control
Inactive Publication Date: 2020-12-29
HUNAN UNIV OF TECH
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Abstract
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Problems solved by technology
However, there is a lack of a starch-based fully degradable film material with better mechanical properties and simple preparation process in this field.
Method used
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Embodiment 1
[0036] (1) Preparation of glycerol / nano-silica mixture
[0037] Weigh 400 g of glycerin in a beaker, weigh 10 g of nano-silica, add nano-silica to glycerin in 2 times, and stir while adding until it becomes milky white viscous, Then put it into an ultrasonic cleaner at a temperature of 50° C. and vibrate and disperse until it is uniformly dispersed to obtain a glycerin / nano-silicon dioxide mixture.
[0038] (2) Preparation of thermoplastic starch granules
[0039] a) The starch raw material was dried in an electric blast drying oven at 75°C for 24 hours, and then sealed and stored to obtain dry starch;
[0040] b) Weigh 1000 g of dry starch and put it into a high-speed mixer, add 410 g of the glycerol / nano-silicon dioxide mixture obtained in (1) into the high-speed mixer for blending in 4 times, and blend for 180 s each time, Stirring was continued for 10 min, and then plasticized at 30°C for 24 h, then melted and extruded through a twin-screw extruder, and the extruded stri...
Embodiment 2
[0046] (1) Preparation of glycerol / nano-silica mixture
[0047] Weigh 400 g of glycerin in a beaker, weigh 10 g of nano-silica, add nano-silica to glycerin in 2 times, and stir while adding until it becomes milky white viscous, Then put it into an ultrasonic cleaner at a temperature of 50° C. and vibrate and disperse until it is uniformly dispersed to obtain a glycerin / nano-silicon dioxide mixture.
[0048] (2) Preparation of plasticized EVOH pellets
[0049] Weigh 200 g EVOH and 40 g glycerol, add 40 g glycerin to 200 g EVOH in 4 times, mix evenly, place at 180°C for 1 h, stir and melt, take out and cool, pulverize and granulate, seal and store to obtain plasticized EVOH granules material.
[0051] Weigh 200 g of PVA and 60 g of glycerol, add 60 g of glycerin to 200 g of PVA and mix evenly, place it at 150°C for 1 h, stir and melt it, take it out for cooling, pulverize and granulate, seal and store to obtain plasticized P...
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Abstract
The invention discloses a starch-based film and a preparation method thereof, and belongs to the technical field of biodegradable starch-based film materials. The starch-based film material is prepared from the following components in parts by weight: 100 parts of starch, 20-60 parts of glycerol, 0-5 parts of nano silicon dioxide, 10-45 parts of a poly(butylene adipate-co-terephthalate) (PBAT), 0-20 parts of ethylene-vinyl alcoholcopolymer (EVOH) and 0-20 parts of polyvinyl alcohol (PVA). The biodegradable film material disclosed by the invention is safe, non-toxic, excellent in mechanical property and biodegradable. The preparation process is simple, easy to implement, low in cost and applicable to various fields.
Description
technical field [0001] The invention belongs to the technical field of biodegradable starch-based film materials, in particular to a starch-based film and a preparation method thereof. Background technique [0002] Petroleum-based polyolefin plastics are widely used in production and life, but while they bring convenience to human beings, they also cause serious environmental pollution. This situation has brought a certain impact to the development of the plastics industry. Therefore, environmentally friendly materials such as bio-based and biodegradable have received extensive attention and attention. At the same time, among plastic products, plastic film is the fastest-growing one in the current market demand, so degradable film materials have become an important direction for research on degradable materials. Among them, starch is favored by researchers because of its wide range of sources, short regeneration cycle and complete degradability. However, at present, the p...
Claims
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Application Information
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