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Starch-based biodegradable composite material and preparation method thereof

A technology of biodegradation and composite materials, applied in the field of starch-based biodegradable composite materials and their preparation, can solve the problems of low mechanical strength, easy moisture absorption, loss of mechanical properties, etc., and achieve good hydrophobicity, good water resistance, enhanced The effect of mechanical properties

Active Publication Date: 2015-10-14
上海耐特复合材料制品有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN1039648C describes a partially biodegradable polymer composition containing a starch component and a synthetic thermoplastic polymer component (a polymer of carboxylic acid or a mixture of this polymer and a polymer obtained from an olefinically unsaturated monomer) , but the composition will lose mechanical properties due to moisture absorption during storage
The Chinese patent CN1202165C of the U.S. Hematerol company describes adding high molecular weight polymers that are basically compatible with starch in the composition, including polyacrylic acid, polyvinyl alcohol, water-soluble cellulose derivatives, etc., to improve starch and polymer Compatibility between them, so that the starch composition can reach the required extensional viscosity, which is convenient for processing in traditional thermoplastic equipment, but the mechanical strength of the obtained product is not high

Method used

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  • Starch-based biodegradable composite material and preparation method thereof
  • Starch-based biodegradable composite material and preparation method thereof
  • Starch-based biodegradable composite material and preparation method thereof

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preparation example Construction

[0041] The preparation method of modified bacterial cellulose fiber is as follows:

[0042] Add acetic anhydride and ethylene glycol into the mixer at a molar ratio of 1:1, heat and stir at 100°C for 100 minutes. After the two substances are compatible, add a catalyst (p-toluenesulfonic acid) accounting for 5% of the total mass of acetic anhydride and ethylene glycol, and then heat to a reaction temperature of 100°C for reaction. The reaction time is 100 minutes, and finally a Carboxylic pale yellow clear liquid product. Cut the bacterial cellulose fiber into small pieces, add a sodium hydroxide solution with a mass percentage concentration of 10%, swell at a temperature of 50°C for 60 minutes, then wash it repeatedly with water and then dry it, and then mix with the aforementioned light yellow clear liquid product Mixing, adding a small amount of concentrated sulfuric acid, and reacting with mechanical stirring for 100 minutes under the conditions of pH value of 4 and temper...

Embodiment 1

[0046] The formulation ratios described in Table 1 below were used to prepare starch-based biodegradable composite materials. First, the cornstarch was treated with 900W high-power microwave for 30 seconds, then the microwave-modified cornstarch, glycerin and water were mixed to form a starch suspension, and then the starch suspension was placed in a mechanical mixer for dispersing for 1 hour. Add the water-dispersed unmodified bacterial cellulose fiber into the starch suspension, then place it in a mechanical mixer and stir for 30 minutes at a temperature of 80°C, take it out and put it into a blast drying oven to dehydrate at a temperature of 80°C for 24 hours, then add Titanium dioxide is extruded, granulated, and injected into a finished product. After testing, the tensile strength of the injection molding sample can reach 10.6MPa.

Embodiment 2

[0048] Except the addition amount of unmodified bacterial cellulose fiber is different, other conditions are all the same as embodiment 1.

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Abstract

The invention discloses a starch-based biodegradable composite material and a preparation method thereof. The preparation method comprises the following steps: treating starch with microwave; mixing the starch treated with microwave with a plasticizer and a pre-plasticizing dispersant in a mass ratio of 1: (0.1-0.5): (2-6), and performing mechanical dispersion to obtain a mixture A; mixing a blending material containing an enhancer and a pre-plasticizing dispersant in a mass ratio of (0.01-1): (5-30) with the mixture A to obtain a mixture B, wherein the enhancer is unmodified bacterial cellulose fiber and / or modified bacterial cellulose fiber, and the mass ratio of the enhancer to the starch is (0.01: 100)-(0.2: 100); and heating and stirring the mixture B, drying to remove water, extruding and granulating, thus obtaining the composite material. The starch-based biodegradable composite material has relatively high mechanical strength and good water resistance.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a starch-based biodegradable composite material and a preparation method thereof. Background technique [0002] Although the sources of traditional plastics are abundant, the physical properties of its products are stable, hygienic and processable, and they are widely used in various fields of the national economy and people's lives, but with the depletion of oil resources and the global demand for "white pollution" With increasing attention, developed countries have begun to develop biodegradable plastics made of natural raw materials. Natural raw materials are generally completely decomposed by natural organisms, and their products will not cause pollution. In addition, natural raw materials can be recycled, so the trend of using natural raw materials to manufacture biodegradable plastics is in the ascendant. [0003] Starch is widely sourced, cheap, recyclable and non-polluti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/02C08L1/02C08L1/08C08L29/04C08L67/04C08K5/053C08K3/22C08J3/28
Inventor 陈勋森叶正涛
Owner 上海耐特复合材料制品有限公司
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