Nano inorganic oxide/silicic acid/cellulose multilayered structure composite enhanced biodegradable material and preparation method thereof

A technology of biodegradable materials and nano-oxides, which is applied in the field of composite reinforced biodegradable materials and its preparation, can solve the problems of polylactic acid’s poor impact resistance and thermal stability, and achieve excellent mechanical properties, performance improvement, and interface compatibility The effect of improving the situation

Active Publication Date: 2018-09-18
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem of poor impact resistance and thermal stability of existing polylactic acid, and provides a biodegradable material reinforced by nano-inorganic oxide / silicic acid / cellulose multilayer structure and its preparation method

Method used

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  • Nano inorganic oxide/silicic acid/cellulose multilayered structure composite enhanced biodegradable material and preparation method thereof

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specific Embodiment approach 1

[0031] Specific Embodiment 1: In this embodiment, the nano-inorganic oxide / silicic acid / cellulose multilayer composite reinforced biodegradable material is obtained by modifying polylactic acid together with toughening materials and coated particles. The toughening material is polybutylene succinate, polyhydroxybutyrate, polycarbonate, polypropylene carbonate or polycaprolactone. The coated particles are particles coated with cellulose as the core, the middle layer is silicic acid, and the outer layer is nanometer oxide.

specific Embodiment approach 2

[0032] Specific embodiment two: the preparation method of the nano-inorganic oxide / silicic acid / cellulose multilayer structure composite reinforced biodegradable material in this embodiment includes the following steps:

[0033] 1. Preparation of cellulose / silicic acid / nano-oxide coated particles:

[0034] Disperse cellulose in sodium silicate aqueous solution to obtain cellulose dispersion, disperse nano-oxides in organic acid to obtain oxide organic acid dispersion, drop cellulose dispersion in alcohol and divide into supernatant A and lower layer Liquid B, collect the lower layer liquid B, and drop the lower layer liquid B into the oxide organic acid dispersion liquid at room temperature while stirring. After the particles are solidified, the core is cellulose, the middle layer is silicic acid, and the outer layer is nano oxide Coated particles coated with material; wherein the mass ratio of cellulose and sodium silicate aqueous solution is (1-10): (3-50), and the mass rati...

specific Embodiment approach 3

[0039] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the cellulose in step 1 is nanocellulose or microcrystalline cellulose. Others are the same as in the first embodiment.

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Abstract

The invention discloses a nano inorganic oxide / silicic acid / cellulose multilayered structure composite enhanced biodegradable material and a preparation method thereof, and relates to the composite enhanced biodegradable material and the preparation method thereof. The invention aims to solve the problem that current polylactic acid has poor impact resistance and thermal stability. The biodegradable material is obtained by co-modification of polylactic acid by a toughening material and coating particles. The method comprises the following steps: 1, preparation of the cellulose / silicic acid / nano oxide coating particles; 2, surface modification of the cellulose / silicic acid / nano oxide coating particles; and 3, preparation of the nano inorganic oxide / silicic acid / cellulose multilayered structure composite enhanced biodegradable material. The material disclosed by the invention has excellent mechanical properties and thermal stability, the impact strength is 1-1.06 J*m<-1>, and the initialdecomposition temperature is 380-388 DEG C; and the material is used in the field of biodegradable materials.

Description

technical field [0001] The invention relates to a composite reinforced biodegradable material and a preparation method thereof. Background technique [0002] As low-carbon environmental protection and green ecology are paid more and more attention, petroleum-based materials are gradually replaced by bio-based materials. As a biodegradable material, polylactic acid has excellent properties such as low density and easy processing and molding, and has a wide range of applications in various fields. . However, due to the rigid molecular chain of polylactic acid, the degree of entanglement is not large, the crystal form is not perfect, and there are defects. When an external force is applied, the stress concentrates on the defect, and the macroscopically shows brittleness, poor toughness, impact resistance, and poor thermal stability. These deficiencies limit the use of polylactic acid in more harsh environments. Contents of the invention [0003] The invention aims to solve ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/02C08L69/00C08L1/02C08L1/04C08K3/34C08K3/36C08K3/22
CPCC08K2003/222C08K2003/2241C08K2003/2244C08K2201/011C08K2201/013C08L67/04C08L2201/08C08L2205/025C08L2205/03C08L1/02C08K3/34C08K3/36C08L69/00C08K9/04C08K3/22C08K3/26C08L67/02
Inventor 张秀成王瑶何连诚王嘉婧罗义琳牛丽姣柴菁珊
Owner NORTHEAST FORESTRY UNIVERSITY
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