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Plant fiber starch fully-biodegradable material and preparation method thereof

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

Inactive Publication Date: 2012-03-21
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 kilograms of corn starch with 0.5 kilograms of plasticizer glycerin and 0.7 kilograms of water, and extrude them through a single screw extruder to obtain 19.2 kilograms of thermoplastic starch, ready for use;

[0018] (2) The coniferous wood is pulverized in a plant crusher, and after screening, 4.5 kg of 50-60 mesh fiber is taken and soaked in 25 kg of chlorinated with a concentration of 8%-12% at a temperature of 30℃~35℃ Lithium / dimethylacetamide solution for 10~30 minutes; then placed in a constant temperature drying oven at 50℃~70℃ for 36h~48h to dry;

[0019] (3) Mix 19.2 kg of thermoplastic starch, processed softwood fiber, 1.2 kg of heat stabilizer polylactic acid, 0.5 kg of dioctyl maleate as a solubilizer, and stir 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 ex...

Embodiment 2

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

[0023] (2) The coniferous wood is crushed in a plant crusher, after screening, take 10 kg of 50-60 mesh fiber, soak it in 33 kg of chlorinated with a concentration of 8%-12% at a temperature of 30℃~35℃ Lithium / dimethylacetamide solution for 10~30 minutes; then placed in a constant temperature drying oven at 50℃~70℃ for 36h~48h to dry;

[0024] (3) Mix 27.5 kg of thermoplastic starch, processed softwood fiber, 3.5 kg of heat stabilizer polylactic acid, 1.8 kg of dioctyl maleate as a solubilizer, and stir 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, extrude and granulate in a twin-screw extruder with a die tem...

Embodiment 3

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

[0028] (2) The coniferous wood is crushed in a plant crusher, and after screening, 20 kg of fibers of 50-60 mesh are taken and immersed in 50 kg of chlorinated fibers with a concentration of 8% to 12% at a temperature of 30°C to 35°C. Lithium / dimethylacetamide solution for 10~30 minutes; then placed in a constant temperature drying oven at 50℃~70℃ for 36h~48h to dry;

[0029] (3) Mix 42 kilograms of thermoplastic starch, processed softwood fiber, 8 kilograms of polylactic acid as a heat stabilizer, 2 kilograms of dioctyl maleate as a solubilizer, and stir in a high-speed mixer for 8-10 minutes, and then add inorganic fillers 1 kg of calcium carbonate and 1 kg of crosslinking agent calcium hydroxide, in a high-speed mixer for 10-15 minutes. Finally, extrude and granulate i...

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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 plant fiber starch completely biodegradable material and a preparation method thereof. Background technique [0002] At present, the packaging materials used in large quantities are still mainly non-degradable plastics, which has caused 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 studies on the complete degradation of plant fiber starch materials. Plant fiber sources are rich, such as peanut shells, waste paper powder, wheat straw, wood chips, bamboo fiber, softwood, straw and so on. The addition of plant fiber can provide certain mechanical strength, improve the hygroscopicity of thermoplastic starch, and help improve the biodegradability of the material. But its water resistance is also limited. It is easy to absorb moisture in moist air for a long time, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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