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Full-starch degradable plastic

A technology for degrading plastics and whole starch, applied in the field of degradable plastics, can solve the problems of lack of toughness and strength, low added value, and inability to be used directly as plastics, and achieve high tensile strength, good thermoplastic processing performance, and mechanical properties. good performance

Inactive Publication Date: 2013-11-27
WUJIANG CITY LI DA LUSTRE FINISHED PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent 200810137247.2 provides a high degree of substitution acetyl starch and its preparation method, which solves the water resistance and thermal processability of starch by increasing the degree of substitution. The degree of substitution can reach 2.8, eliminating most of the hydroxyl groups that affect thermal processability , but the material cannot be used directly as a plastic due to lack of toughness and strength
[0005] my country is a major producer and consumer of rice, with an annual output of about 180 million tons of rice, but most of it is directly used for food with low added value. If rice can be modified, including broken rice, old indica rice, early indica rice After that, it can be processed into porous starch, starch microspheres and other products with more characteristics and new uses, which can greatly increase its added value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of starch microspheres: Weigh 30g of rice starch by mass, add 70g of distilled water, mix thoroughly, adjust the pH to 10 with 2mol / L NaOH solution, boil on an electric stove until transparent, cool to 35°C for use. Add 0.75 g of Span60 to 15 g of soybean oil, heat and stir in a constant temperature water bath at 60°C until the emulsifier is completely dissolved, then pour the mixture into a container to obtain an oil phase, and store it at a constant temperature of 50°C for later use. Add the obtained rice starch solution into the prepared soybean oil phase (v / v=3:1), oscillate and disperse evenly, add 3ml of polyethylene glycol, cross-link for 2 hours, and centrifuge to separate the microspheres. Wash the residual oil phase with ethyl acetate, wash with absolute ethanol, and dry the obtained starch microspheres at 50° C., with an average particle size of 15-18 μm.

[0022] Whole starch biodegradable plastic, composed of the following mass ratio raw materia...

Embodiment 2

[0024] Whole starch biodegradable plastic, composed of the following mass ratio raw materials, rice starch microspheres 45%, ethyl cellulose 10%, plasticizer dibutyl phthalate 5%, stabilizer sorbitol 3%, stearin Magnesium acid lubricant 2%.

Embodiment 3

[0026] Whole starch biodegradable plastic, composed of the following mass ratio raw materials, rice starch microspheres 70%, ethyl cellulose 10%, plasticizer dibutyl phthalate 5%, stabilizer sorbitol 3%, stearin Magnesium acid lubricant 2%.

[0027] Table 1 Effect of different amounts of starch microspheres on plastic properties

[0028] Tensile strength MPa Elongation at break% Tear strength KN / m Low temperature bendability ℃ Example 1 16 140 35 -10 Example 2 28 395 55 -20 Example 3 29 400 55 -21

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Abstract

The invention provides a full-starch degradable plastic. The full-starch degradable plastic is characterized in that the full-starch degradable plastic is composed of 25-80mass% of a rice starch microsphere, 5-10mass% of ethyl cellulose, 2-5mass% of a plasticizer dibutyl phthalate, 1-3mass% of a stabilizer sorbitol and 1-2mass% of a lubricant magnesium stearate. Rice starch is processed to prepare starch microspheres, and the starch microspheres are denatured starch prepared through a step of the appropriate cross-linking of a cross-linking agent with the hydroxy group on a raw material starch under the action of an initiator and a step of microspheroidization, and are a novel environmentally-friendly adsorption material developed in recent years. The starch microspheres have the advantages of good adsorptivity, good compressive property, good biodegradability and good biocompatibility.

Description

technical field [0001] The invention relates to a degradable plastic, in particular to a degradable plastic composed of whole starch microspheres. Background technique [0002] Since the 1990s, all-starch plastics have been developed at home and abroad. Due to the strong hydrogen bonds between natural starch molecules, natural starch has a microcrystalline structure and a granular structure, and the melting temperature of the microcrystalline is higher than the thermal decomposition temperature of starch, so that it does not have thermoplastic processing properties. However, if the starch structure can be disordered and its crystallites destroyed, the starch can have thermoplastic processing properties, so this type of starch is also called thermoplastic starch. The production principle of all-starch plastics is to disorder the molecular structure of starch to form a thermoplastic starch resin. Due to its complete biodegradability and thermoplasticity, it has attracted peo...

Claims

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Application Information

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IPC IPC(8): C08L3/02C08L1/28C08K13/02C08K5/12C08K5/053C08K5/098
Inventor 凌元若
Owner WUJIANG CITY LI DA LUSTRE FINISHED PROD
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