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Plant fiber starch fully-biodegradable material and preparation method thereof

A biodegradable material, plant fiber starch technology, applied in the field of packaging materials, can solve the problems of decreased stability, poor water resistance, insoluble, etc., and achieve the effects of improving heat resistance, improving mechanical properties, and improving mechanical properties

Inactive Publication Date: 2011-01-12
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, 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. When it encounters water or in humid air for a long time, it is easy to absorb water and its stability decreases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Mix 18 kg of cornstarch with 0.5 kg of plasticizer glycerin and 0.7 kg of water, and extrude through a single-screw extruder to obtain 19.2 kg of thermoplastic starch for use;

[0018] (2) Pulverize the coniferous wood in a plant grinder, after screening, take 4.5 kg of fibers of 50-60 mesh, soak in 25 kg of chlorinated Lithium / dimethylacetamide solution for 10 to 30 minutes; then placed in a constant temperature oven at 50°C to 70°C for 36h to 48h to dry;

[0019] (3) Stir 19.2 kg of thermoplastic starch, processed coniferous wood fiber, heat stabilizer polylactic acid 1.2 kg, solubilizer dioctyl maleate 0.5 kg in a high-speed mixer for 8-10 minutes, and then add inorganic fillers 0.5 kg of calcium carbonate and 0.6 kg of cross-linking agent calcium hydroxide, in a high-speed mixer for 10-15 minutes. Finally, extrude and granulate in a twin-screw extruder with a head temperature of 120-140°C and a screw speed of 100-120r / min. The performance of the product in this...

Embodiment 2

[0022] (1) Mix 25 kilograms of cornstarch with 1 kilogram of plasticizer glycerin and 1.5 kilograms of water, and extrude through a single-screw extruder to obtain 27.5 kilograms of thermoplastic starch for use;

[0023] (2) Grind the coniferous wood in a plant pulverizer, and after screening, take 10 kg of fibers of 50-60 mesh, soak them in 33 kg of chlorinated Lithium / dimethylacetamide solution for 10 to 30 minutes; then placed in a constant temperature oven at 50°C to 70°C for 36h to 48h to dry;

[0024] (3) Stir 27.5 kg of thermoplastic starch, processed coniferous wood fiber, heat stabilizer polylactic acid 3.5 kg, solubilizer dioctyl maleate 1.8 kg in a high-speed mixer for 8-10 minutes, and then add inorganic fillers 1.2 kg of calcium carbonate and 1 kg of cross-linking agent calcium hydroxide, in a high-speed mixer for 10-15 minutes. Finally, it is extruded and granulated in a twin-screw extruder with a head temperature of 120-140°C and a screw speed of 100-120r / min. ...

Embodiment 3

[0027] (1) Mix 40 kilograms of cornstarch with 1.2 kilograms of plasticizer glycerin and 3 kilograms of water, and extrude through a single-screw extruder to obtain 44.2 kilograms of thermoplastic starch for use;

[0028] (2) Pulverize the coniferous wood in a plant grinder, after screening, take 20 kg of 50-60 mesh fibers, soak in 50 kg of chlorinated Lithium / dimethylacetamide solution for 10 to 30 minutes; then placed in a constant temperature oven at 50°C to 70°C for 36h to 48h to dry;

[0029] (3) Mix 42 kg of thermoplastic starch, 8 kg of processed coniferous wood fiber, heat stabilizer polylactic acid, and 2 kg of solubilizer dioctyl maleate in a high-speed mixer for 8-10 minutes, then add inorganic fillers 1 kg of calcium carbonate and 1 kg of cross-linking agent calcium hydroxide, in a high-speed mixer for 10-15 minutes. Finally, it is extruded and granulated in a twin-screw extruder with a head temperature of 120-140°C and a screw speed of 100-120r / min. The product ...

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Abstract

The invention discloses a plant fiber starch fully-biodegradable material and a preparation method thereof. The material is a product prepared by melting, blending and extruding thermoplastic corn starch, 50 to 60 mesh needlebush fibers, polylactic acid, inorganic stuffing, a crosslinking agent and a solubilizer in a twin-screw extruder. The thermoplastic corn starch is a product prepared by extruding the corn starch and the solubilizer which are blended according to a ratio of 40 to 70: 2 to 5 in a single screw extruder. In the invention, dioctyl maleate (MOD) is grafted onto the polylactic acid to perform a hydroxylation reaction of MOD-functionalized polylactic acid and thermoplastic starch, so that PLA and TPS interfaces are soluble mutually and the binding force of the interfaces is improved. The product has high water resistance and high mechanical properties. Compared with the conventional thermoplastic corn starch composition packing material, the stretching strength of the material of the invention is improved by 30 to 60 percent, the rigidity is increased by 15 to 35 percent, the water absorption is reduced by 13 to 40 percent, and the material is nontoxic and low in cost.

Description

technical field [0001] The invention relates to a packaging material, in particular to a completely biodegradable material of plant fiber starch and a preparation method thereof. Background technique [0002] At present, the packaging materials used in large quantities are still mainly non-degradable plastics, forming serious "white pollution". The existing degradable packaging materials are mainly paper products, but the cost of paper products is relatively high. At present, there have been researches on completely degradable materials of plant fiber starch. Plant fiber sources are abundant, such as peanut shells, waste paper powder, wheat straw, sawdust, bamboo fiber, coniferous wood, straw, etc. The addition of plant fiber can provide a certain mechanical strength, improve the hygroscopicity of thermoplastic starch, and help improve the biodegradability of the material. However, its water resistance is also limited, and it is easy to absorb moisture in humid air for a l...

Claims

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Application Information

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IPC IPC(8): C08L3/02C08L97/02C08L67/04C08K13/02C08K5/053C08K3/22C08K5/11C08K3/26B29B9/06B29C47/92B29C48/92
CPCB29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 曾广胜林瑞珍
Owner HUNAN UNIV OF TECH
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