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Preparation method of barium sulfate polylactic acid composite material

A composite material, barium sulfate technology, applied in the field of preparation of barium sulfate polylactic acid composite materials, can solve the problems of poor impact resistance, long degradation cycle, weak interface bonding force, etc., to improve mechanical properties, improve hydrophobicity, transparency Reduced effect

Active Publication Date: 2020-07-03
安康市利源矿业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polylactic acid also has disadvantages such as poor hydrophilicity, high brittleness, poor impact resistance, and long degradation cycle.
[0003]In order to improve the mechanical properties of polylactic acid, researchers tried to blend inorganic materials with polylactic acid, but due to the weak interfacial bonding force between the two, the composite The compatibility is extremely poor, and the inorganic materials are easy to agglomerate into particles in the polylactic acid, which leads to the failure to improve the mechanical properties of the composite material, or even decline.
In addition, after compounding inorganic materials, it is easy to cause the light transmittance of polylactic acid to decrease.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Preparation of modifier: add ethylenediamine to benzene, stir and disperse, then add phthalic anhydride, the molar ratio of ethylenediamine to phthalic anhydride is 1:1.1, heat to 50°C under rapid stirring , reacted for 30 minutes, after cooling, add deionized water, stir and disperse, then spin evaporate at 72°C, after most of the solvent evaporates, collect the product at the bottom of the spin steamer;

[0022] 2) Barium sulfate modification: disperse the product obtained in step 1) in ethanol, add 0.1 micron barium sulfate particles according to the molar ratio of phthalic anhydride and barium sulfate as 1:0.7, and ultrasonically disperse evenly. reacted at low temperature for 3 hours, filtered, washed with absolute ethanol, and dried in vacuum at 60°C for 10 minutes to obtain modified barium sulfate;

[0023] 3) Composite material preparation: premix the modified barium sulfate obtained in step 2) with polylactic acid, barium sulfate accounts for 20% of the mass...

Embodiment 2

[0027] 1) Preparation of modifier: add ethylenediamine to benzene, stir and disperse, then add phthalic anhydride, the molar ratio of ethylenediamine to phthalic anhydride is 1:1.3, heat to 50°C under rapid stirring , reacted for 30 minutes, after cooling, add deionized water, stir and disperse, then spin evaporate at 72°C, after most of the solvent evaporates, collect the product at the bottom of the spin steamer;

[0028] 2) Barium sulfate modification: disperse the product obtained in step 1) in ethanol, add 0.1 micron barium sulfate particles according to the molar ratio of phthalic anhydride and barium sulfate as 1:0.8, and ultrasonically disperse evenly. reacted at low temperature for 3 hours, filtered, washed with absolute ethanol, and dried in vacuum at 60°C for 10 minutes to obtain modified barium sulfate;

[0029] 3) Composite material preparation: premix the modified barium sulfate obtained in step 2) with polylactic acid, barium sulfate accounts for 40% of the mass...

Embodiment 3

[0033] 1) Barium sulfate modification: disperse stearic acid in ethanol, add 0.1 micron barium sulfate particles according to the molar ratio of stearic acid and barium sulfate is 1:0.7, disperse uniformly by ultrasonic, react at 40°C for 3h, filter , washed with absolute ethanol, and dried in vacuum at 60°C for 10 minutes to obtain modified barium sulfate;

[0034] 3) Composite material preparation: premix the modified barium sulfate obtained in step 2) with polylactic acid, barium sulfate accounts for 20% of the mass of polylactic acid, add a double-roll mill for melt blending, and the melt blending temperature is 160 ° C. Time is 15min, obtains blended product;

[0035] 4) Hot pressing the blended product obtained in step 3) to obtain a barium sulfate polylactic acid composite material.

[0036] After testing, the tensile strength of the composite material is 68.9MPa, and the light transmittance is 88.6%.

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Abstract

The invention relates to a preparation method of a barium sulfate polylactic acid composite material. The preparation method comprises the following steps: 1) adding ethylene diamine and phthalic anhydride into benzene, stirring, heating, reacting, cooling, adding deionized water, stirring, dispersing, and carrying out rotary evaporation to obtain a modifier; 2) dispersing a modifier in ethanol, adding micron-sized barium sulfate particles, performing uniform ultrasonic dispersion, and heating to carry out reactions to obtain modified barium sulfate; 3) premixing modified barium sulfate and polylactic acid, melting, and blending; and 4) carrying out hot-pressing and moulding to obtain the barium sulfate polylactic acid composite material. The preparation method has the advantages that thecompatibility between inorganic nano particles and polylactic acid can be improved, inorganic particles can be uniformly dispersed in polylactic acid, and the transparency of polylactic acid is maintained or even improved while the mechanical properties such as the tensile strength of the polylactic acid are improved.

Description

technical field [0001] The application relates to a method for preparing a transparent plastic material, in particular to a method for preparing a barium sulfate polylactic acid composite material. Background technique [0002] Polylactic acid is a polymer polyester formed by the ring-opening polymerization of lactide, a cyclic dimer of lactic acid, so it is also called polylactide. Polylactic acid has good strength, chemical inertness and easy processability, excellent biocompatibility and degradability, and good transparency. It is a renewable resource. Polylactic acid can be completely degraded into carbon dioxide and water after use, avoiding the problem of white pollution, and is a completely degradable environmentally friendly material. However, polylactic acid also has disadvantages such as poor hydrophilicity, high brittleness, poor impact resistance, and long degradation cycle. [0003] In order to improve the mechanical properties of polylactic acid, researchers ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K9/12C08K9/04C08K3/30
CPCC08K9/12C08K9/04C08K3/30C08L2201/10C08K2003/3045C08K2201/003C08L67/04
Inventor 唐洁净
Owner 安康市利源矿业有限责任公司