Completely biodegradable food packing material and preparation method thereof

A technology for food packaging and biodegradation, applied in the field of fully biodegradable food packaging materials and their preparation, can solve the problems of affecting packaging quality and effect, reducing mechanical strength, affecting human health, etc. The effect of improving the tensile strength and improving the appearance whiteness

Inactive Publication Date: 2011-06-01
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most of the disposable fast food boxes used in large quantities are plastic products made of toxic additives, which not only affect human health, but also cause serious "white pollution" to the environment; a small amount of paper products are used, but the cost of paper products is high. One type of biodegradable material is starch, which will be decomposed into non-toxic CO by microorganisms in the natural environment. 2 and H 2 O, but the starch molecular chain contains a large number of hydroxyl groups, which are easy to form hydrogen bonds inside and outside the molecular chain, so it is insoluble, diffic

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Configuration of the mixed soaking solution: add 300g sodium hydroxide and 200g thiourea to 3kg of water, cool it to -5°C, then take it out and cool it to room temperature;

[0021] (2) Soak 10 kilograms of 60-70 mesh bamboo fibers in the mixed soaking solution in (1) for 12-24 hours, and then stir the bamboo fiber mixture in a high-speed mixer for 20-30 minutes;

[0022] (3) Take half the amount of potato starch 15 kg, add hot water at 65-75 ℃ and stir for 15-30 minutes until gelatinization;

[0023] (4) Mix the treated bamboo fiber aqueous solution, gelatinized starch, 2.5 kg polycaprolactone, 2 kg ethylene glycol, and 1.0 kg polyacrylic acid (PAA) as a solubilizer, mix and stir for 10-20 minutes, then add talcum powder 1 kg, 1 kg calcium hydroxide, 15 kg remaining ungelatinized starch, stir together for 20-35 minutes;

[0024] (5) Pass the mixed raw materials through a twin-screw extruder, melt, blend, extrude and granulate under the conditions of a temperature ...

Embodiment 2

[0028] (1) Configuration of the mixed soaking solution: add 400g of sodium hydroxide and 350g of thiourea to 5.5kg of water, cool it to -5°C, then take it out and cool it to room temperature;

[0029] (2) Soak 20 kilograms of 60-70 mesh bamboo fibers in the mixed soaking solution in (1) for 12-24 hours, and then stir the bamboo fiber mixture in a high-speed mixer for 20-30 minutes;

[0030] (3) Take 20 kg of half of the potato starch, put it into 2 kg of hot water at 65-75°C and stir for 15-30 minutes to gelatinize;

[0031] (4) Mix the treated bamboo fiber aqueous solution, gelatinized starch, 9 kg of polycaprolactone, 3 kg of ethylene glycol, and 2 kg of polyacrylic acid (PAA) as a solubilizer, mix and stir for 10 to 20 minutes, then add talc powder 1.5 kg, 1.5 kg calcium hydroxide, and the remaining ungelatinized starch, stir together for 20-35 minutes;

[0032] (5) Pass the mixed raw materials through a twin-screw extruder, melt, blend, extrude and granulate under the con...

Embodiment 3

[0036] (1) Configuration of the mixed soaking solution: add 500g of sodium hydroxide and 400g of thiourea to 6kg of water, cool it to -5°C, then take it out and cool it to room temperature;

[0037] (2) Soak 30 kilograms of 60-70 mesh bamboo fibers in the mixed soaking solution in (1) for 12-24 hours, and then stir the bamboo fiber mixture in a high-speed mixer for 20-30 minutes;

[0038] (3) Take 30 kg of half of the potato starch, put it into 5 kg of hot water at 65-75°C and stir for 15-30 minutes to gelatinize;

[0039] (4) Mix the treated bamboo fiber aqueous solution, gelatinized starch, 10 kg of polycaprolactone, 5 kg of ethylene glycol, and 2.5 kg of polyacrylic acid (PAA) as a solubilizer, mix and stir for 10 to 20 minutes, then add talc powder 2 kg, 2 kg of calcium hydroxide, and the remaining ungelatinized starch, stir together for 20-35 minutes;

[0040] (5) Pass the mixed raw materials through a twin-screw extruder, melt, blend, extrude and granulate under the con...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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PUM

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Abstract

The invention discloses a completely biodegradable food packing material and a preparation method thereof. The completely biodegradable material of plant fiber and starch is a product obtained by melting, blending and extruding potato starch, bamboo fiber, polycaprolactone, a plasticizer, an inorganic filling agent and a cross linker through a double-screw extruder; and the molten blend comprises the following components in parts by weight: 40 to 60 parts of potato starch, 10 to 30 parts of bamboo fiber, 5 to 10 parts of polycaprolactone, 2 to 10 parts of inorganic filling agent, 2 to 8 parts of cross linker, 5 to 20 parts of plasticizer and 2 to 10 parts of solubilizing agent. Compared with the traditional starch-based plastic degradable material, the tensile strength of the completely biodegradable material is improved by 20 to 40 percent; the stiffness is improved by 20 to 40 percent; the water absorption is reduced by 10 to 20 percent; and the completely biodegradable material has excellent properties of low cost, complete biodegradability and environmental friendliness, and can be widely used for packing food, particularly disposable instant snack boxes.

Description

technical field [0001] The invention relates to a completely biodegradable food packaging material and a preparation method. Background technique [0002] At present, most of the disposable fast food boxes used in large quantities are plastic products made of toxic additives, which not only affect human health, but also cause serious "white pollution" to the environment; a small amount of paper products are used, but the cost of paper products is high. One type of biodegradable material is starch, which will be decomposed into non-toxic CO by microorganisms in the natural environment. 2 and H 2 O, but the starch molecular chain contains a large number of hydroxyl groups, which are easy to form hydrogen bonds inside and outside the molecular chain, so it is insoluble, difficult to melt, and has poor water resistance. It is easy to absorb water when it meets water or in humid air for a long time. It is stable There is also plant fiber, such as peanut shells, waste paper powd...

Claims

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Application Information

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IPC IPC(8): C08L3/02C08L97/02C08L67/04C08K13/02C08K3/34C08K3/22B65D65/46B29C47/92B29C48/92
CPCB29C48/04B29C48/92B29C2948/9259B29C2948/92704B29C2948/92895
Inventor 曾广胜林瑞珍
Owner HUNAN UNIV OF TECH
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