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A kind of reinforced polylactic acid-based composite material and its preparation method

A composite material, polylactic acid technology, applied in the field of composite materials, can solve the problems of poor mechanical properties such as impact resistance, poor mechanical properties of polylactic acid, and reduce interface bonding force, etc., achieve high elastic modulus, improve interface bonding, increase build effect

Active Publication Date: 2020-04-17
HANGZHOU CHANGGANG PAPER IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As an environmentally friendly material, polylactic acid is characterized by its degradability and biocompatibility. In addition, polylactic acid also has excellent post-processing, transparency, gas barrier and thermal barrier properties; but Polylactic acid materials also have some disadvantages. First, the surface of polylactic acid is hydrophobic, which greatly reduces the interfacial bonding force between it and natural hydrophilic materials (such as plant fiber materials); second, polylactic acid is brittle and impact-resistant. poor mechanical properties
[0005] At present, in order to solve the problem of poor mechanical properties of polylactic acid, many researchers strengthen it by adding nanocellulose / cellulose. Compatibility additives such as joint agent, or use organic solvents such as chloroform and chloroform to dissolve polylactic acid. The additives and solvents used have certain toxicity and are not easy to degrade. And only cellulose is used to strengthen polylactic acid. The effect is not good. too obvious. Therefore, the present invention is dedicated to the research of a reinforced polylactic acid-based composite material, the raw materials used are all biodegradable, which has strong theoretical significance and application value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step (1): Weigh 3 parts of carboxymethylcellulose, 0.1 part of chitosan and 0.5 part of guar gum, dissolve them in hot water at 65°C, and keep stirring until they are completely dissolved.

[0025] Step (2): Weigh 70 parts of polylactic acid and add it to the mixed solution obtained in step (1), disperse it in a high-speed shearing machine at a speed of 3000r / min for 15 minutes, and then pass the fully dispersed mixed solution through a 100°C Evaporate the water solvent in a water bath. After the water solvent evaporates completely, set the temperature of the oven at 65° C. and take the mixture out after 12 hours in the oven to obtain a preliminary polylactic acid composite.

[0026] Step (3): Weigh 20 parts of modified nano-calcium carbonate and 10 parts of modified nano-fibrillated cellulose, melt and disperse them through an extruder together with the polylactic acid compound obtained in step (2), and extrude to granulate The mixed material is obtained, and then the ...

Embodiment 2

[0028] Step (1): Weigh 6 parts of carboxymethylcellulose, 0.1 part of chitosan and 1 part of guar gum, dissolve them in hot water at 65°C, and keep stirring until they are completely dissolved.

[0029] Step (2): Weigh 50 parts of polylactic acid and add it to the mixed solution obtained in step (1), disperse it in a high-speed shearing machine at a speed of 3000r / min for 15 minutes, and then pass the fully dispersed mixed solution through a 100°C Evaporate the water solvent in a water bath. After the water solvent evaporates completely, set the temperature of the oven at 65° C. and take the mixture out after 12 hours in the oven to obtain a preliminary polylactic acid composite.

[0030] Step (3): Weigh 35 parts of modified nano-calcium carbonate and 15 parts of modified nano-fibrillated cellulose, melt and disperse them together with the polylactic acid compound obtained in step (2) through an extruder and extrude to granulate The mixed material is obtained, and then the mix...

Embodiment 3

[0032] Step (1): Weigh 5 parts of carboxymethylcellulose, 0.5 part of chitosan and 0.5 part of guar gum, dissolve them in hot water at 65°C, and keep stirring until completely dissolved.

[0033] Step (2): Weigh 60 parts of polylactic acid and add it to the mixed solution obtained in step (1), disperse it in a high-speed shearing machine at a speed of 3000r / min for 15 minutes, and then pass the fully dispersed mixed solution through a 100°C Evaporate the water solvent in a water bath. After the water solvent evaporates completely, set the temperature of the oven at 65° C. and take the mixture out after 12 hours in the oven to obtain a preliminary polylactic acid composite.

[0034] Step (3): Weigh 35 parts of modified nano-calcium carbonate and 5 parts of modified nano-fibrillated cellulose, melt and disperse them through an extruder together with the polylactic acid compound obtained in step (2), and extrude to granulate The mixed material is obtained, and then the mixed mate...

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Abstract

The invention discloses a reinforced polylactic acid-based composite material and a preparation method thereof. The present invention uses polylactic acid as the base material, modified nano-calcium carbonate and modified nano-fibrillated cellulose as reinforcing agents, carboxymethyl cellulose and guar gum as dispersants and compatibilizers, and adds chitosan as Antibacterial agent, through high-speed shear dispersion, water bath evaporation, drying, extrusion granulation and tape casting, etc., to prepare a reinforced polylactic acid-based composite material. The reinforced polylactic acid-based composite material of the present invention uses natural raw materials, which are all biodegradable, and is a green and environmentally friendly composite material; the source of raw materials is wide, which reduces production costs and is conducive to industrial production; the use of modified Nano-scale material modified nano-calcium carbonate and modified nano-fibrillated cellulose can effectively improve the mechanical properties of polylactic acid and endow composite materials with excellent comprehensive properties.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a reinforced polylactic acid-based composite material and a preparation method thereof. Background technique [0002] Nanoparticles are dispersed in the composite material system, because of their small particle size, large specific surface area, and large proportion of atoms in the surface layer, they can theoretically be fully adsorbed and bonded with the polymer in the system, and strengthen the particle and The interfacial bonding of the matrix; moreover, the nanoparticles are highly active and can interact strongly with many active points in molecules such as other additives, which can significantly improve the mechanical properties of the composite material. [0003] Nano-calcium carbonate and nano-fibrillated cellulose (NFC) are nano-scale materials. Nano-calcium carbonate is ultra-fine calcium carbonate, which is used in polymer materials. It has the function of toughe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L1/28C08L5/08C08L5/00C08L1/02C08K9/04C08K3/26
CPCC08K2201/003C08K2201/011C08K2201/018C08L67/04C08L2201/06C08L2205/02C08L2205/035C08L1/286C08L5/08C08L5/00C08L1/02C08K9/04C08K3/26
Inventor 唐艳军王小宇
Owner HANGZHOU CHANGGANG PAPER IND
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