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High-strength polylactic acid foamed plastic and preparation method thereof

A polylactic acid foaming and high-strength technology, which is applied in the field of foamed plastics, can solve the problems of limiting the application range of polylactic acid, lack of flexibility and elasticity, and easy bending and deformation, and achieve good mechanical properties, strong functionality, and improved toughness. Effect

Pending Publication Date: 2019-11-22
HUBEI UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Polylactic acid has high tensile strength and compression modulus, but it is hard and tough, lacks flexibility and elasticity, and is easily bent and deformed, which greatly limits the application range of polylactic acid.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The invention provides a technical solution: a high-strength polylactic acid foamed plastic, including (according to mass percentage): 38% of polylactic acid, 1.2% of chain extender, 6% of plasticizer, 2% of azodicarbonamide %, sodium bicarbonate 1.6%, zinc oxide 0.1%, talcum powder 6%, nano-alumina 8%, random polypropylene 9%, and the balance is deionized water.

[0025] A preparation method of high-strength polylactic acid foamed plastics, comprising the following preparation steps:

[0026] S1: Weigh the proportion and prepare the materials according to the composition of the above components;

[0027] S2: Dehydration of polylactic acid. Place polylactic acid in a vacuum drying oven filled with molecular sieves. The temperature of the vacuum drying oven is controlled at 48°C. After drying for 2.5 hours, cool to room temperature to obtain dry polylactic acid;

[0028] S3: Modified mixing, place the dried polylactic acid in a high-speed mixer, and add chain extender, ...

Embodiment 2

[0034] The invention provides a technical solution: a high-strength polylactic acid foamed plastic, including (according to mass percentage): 40% polylactic acid, 3% chain extender, 7% plasticizer, 2.5% azodicarbonamide %, sodium bicarbonate 1.6%, zinc oxide 2%, talcum powder 7%, nano-alumina 10%, random polypropylene 10%, and the balance is deionized water.

[0035] A preparation method of high-strength polylactic acid foamed plastics, comprising the following preparation steps:

[0036] S1: Weigh the proportion and prepare the materials according to the composition of the above components;

[0037] S2: Dehydration of polylactic acid, placing polylactic acid in a vacuum drying oven filled with molecular sieves, controlling the temperature of the vacuum drying oven at 50°C, drying for 3 hours and then cooling to room temperature to obtain dry polylactic acid;

[0038] S3: Modified mixing, place the dried polylactic acid in a high-speed mixer, and add chain extender, plasticiz...

Embodiment 3

[0044] The invention provides a technical solution: a high-strength polylactic acid foamed plastic, including (according to mass percentage): polylactic acid 42%, chain extender 2%, plasticizer 7%, azodicarbonamide 2.5% %, sodium bicarbonate 2%, zinc oxide 2%, talcum powder 7%, nano-alumina 10%, random polypropylene 12%, and the balance is deionized water.

[0045] A preparation method of high-strength polylactic acid foamed plastics, comprising the following preparation steps:

[0046] S1: Weigh the proportion and prepare the materials according to the composition of the above components;

[0047] S2: Dehydration of polylactic acid. Place polylactic acid in a vacuum drying oven filled with molecular sieves. The temperature of the vacuum drying oven is controlled at 60°C. After drying for 4.0 hours, cool to room temperature to obtain dry polylactic acid;

[0048]S3: Modified mixing, place the dried polylactic acid in a high-speed mixer, and add chain extender, plasticizer and...

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Abstract

The invention relates to the technical field of foamed plastic, particularly to high-strength polylactic acid foamed plastic including, by mass, 38-46% of polylactic acid, 1.2-3% of a chain extender,6-8% of a plasticizer, 2-3% of azodicarbonamide, 1.6-2.2% of sodium bicarbonate, 0.1-3.2% of zinc oxide, 6-8% of talcum powder, 8-12% of nano aluminum dioxide, and 9-14% of atactic polypropylene, withthe balance being deionized water. The invention further discloses a preparation method of the high-strength polylactic acid foamed plastic. The preparation method comprises the following preparationsteps: S1, weighing and proportioning; S2, dehydrating the polylactic acid; S3, modifying and mixing; S4, extruding and granulating; S5, cooling and shaping. The plastic has the beneficial effects that the formula is more scientific and reasonable, the polylactic acid is filled with the nanometer aluminum dioxide, and the chemical bond effect between the nanometer aluminum dioxide and the polylactic acid is utilized, so that the plastic has good mechanical performance, can be completely biodegraded, does not pollute the environment, is higher in functionality and is beneficial to popularization.

Description

technical field [0001] The invention relates to the technical field of foamed plastics, in particular to a high-strength polylactic acid foamed plastic and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a new type of polymer material that is environmentally friendly and has excellent performance. The raw material it uses is lactic acid, a natural product, which can be produced cheaply in large quantities by processing corn or potato into starch and fermenting it. Polylactic acid is a high-molecular polyester polymerized from lactic acid monomers. It is a completely biodegradable polymer material. Its final degradation products are carbon dioxide and water. It is non-toxic and harmless to the environment, and can also be degradation. The degradation intermediate product of polylactic acid, lactic acid, and the final degradation product are normal metabolites of the human body, which will not cause any toxic and side effects to the body,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L23/12C08K13/02C08K3/22C08K3/34C08K5/053C08K5/11C08J9/10C08J9/08
CPCC08J9/103C08J9/08C08J9/0061C08J9/0066C08J9/0071C08J9/0023C08J2367/04C08J2423/12C08K13/02C08K2003/2296C08K2003/2227C08K2201/011C08K3/34C08K5/053C08K5/11C08J2203/04C08J2203/02C08J2203/18
Inventor 朱文利
Owner HUBEI UNIV OF ARTS & SCI
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