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Stereo composite polylactic acid foam material for oil-water separation and preparation method thereof

A technology for composite polylactic acid and foam materials, applied in the field of stereocomposite polylactic acid foam materials and their preparation, and polylactic acid foam materials, can solve the problems of post-use treatment of unfavorable materials, difficulty in large-scale promotion, harsh preparation conditions, etc., and achieve Excellent hydrophobicity, improved physical and mechanical properties, and increased surface roughness

Active Publication Date: 2022-04-05
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The traditional method of introducing SC includes melting high-temperature annealing or adding a nucleating agent in the solution, but the above-mentioned methods are either high in energy consumption, high in cost, or have harsh preparation conditions and complicated steps, which are not conducive to the post-use treatment of materials, and are difficult to promote on a large scale.

Method used

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  • Stereo composite polylactic acid foam material for oil-water separation and preparation method thereof
  • Stereo composite polylactic acid foam material for oil-water separation and preparation method thereof
  • Stereo composite polylactic acid foam material for oil-water separation and preparation method thereof

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preparation example Construction

[0033] A method for preparing a stereocomplex polylactic acid foam material for oil-water separation, the preparation raw materials include the following components: L-polylactic acid, D-polylactic acid, organic solvent and poor solvent;

[0034] The mass ratio of each component is: L-polylactic acid (1-2.5%), D-polylactic acid (1-2.5%), poor solvent (3-6%) and good solvent (89-95%), of which L-polylactic acid The mass ratio to D-polylactic acid is 1:1.

[0035] The concrete steps of its preparation method are as follows:

[0036] Step 1, preparation: L-PLA and D-PLA were dried in a vacuum oven at 70°C for 12 h before the experiment;

[0037] Step 2, prepare the organic solution of polylactic acid: Weigh the same mass of L-polylactic acid and D-polylactic acid in 50mL of 1,4-dioxane, and heat and stir at 55°C and 300 r / min for 3 h ;

[0038] Step 3, prepare a ternary solution of polylactic acid, 1,4-dioxane and water: Slowly add a certain amount of deionized water to the ab...

Embodiment 1

[0043] In the preparation method of the stereocomplex polylactic acid foam material of this embodiment, the mass percentages of each component added are: 1.36% of L-polylactic acid, 1.36% of D-polylactic acid, 94.00% of dioxane, and 3.28% of deionized water ;

[0044] The performance detection of the polylactic acid foam that the present embodiment prepares:

[0045] 1. Use a scanning electron microscope to observe the internal structure of the polylactic acid foam prepared in this embodiment, as figure 1 As shown in Figure a, the internal pores of the high-performance stereocomposite polylactic acid foam present a uniformly distributed micro-nano multi-level structure;

[0046] 2. Use cyclohexane, ethanol, carbon tetrachloride, pump oil and soybean oil to test the absorption capacity of the polylactic acid foam prepared in this embodiment to different types of oil stains, such as Figure 4 As shown in Figure a on the left; the mixed solution of cyclohexane and water dyed by S...

Embodiment 2

[0048] In the preparation method of the stereocomplex polylactic acid foam material of this embodiment, the mass percentage of each component is: 1.36% of L-polylactic acid, 1.36% of D-polylactic acid, 93.65% of dioxane, and 3.63% of deionized water;

[0049] The performance detection of the polylactic acid foam that the present embodiment prepares:

[0050] Adopt differential scanning calorimeter to observe the crystallization situation of the polylactic acid foam that present embodiment prepares, as figure 2 As shown, the high-performance stereocomplex PLA foam has higher SC crystallization and lower HC crystallization.

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Abstract

The invention belongs to the field of functional materials, and relates to a polylactic acid foam material, in particular to a stereocomplex polylactic acid foam material for oil-water separation and a preparation method thereof. The preparation method comprises the following steps: dissolving the same amount of L-polylactic acid and D-polylactic acid in an organic solvent, and stirring at 50-70 DEG C until the L-polylactic acid and the D-polylactic acid are dissolved to obtain a polylactic acid solution; slowly dropwise adding a poor solvent into the polylactic acid solution in a stirring state; freezing the solution at a low temperature of-4 to-20 DEG C for 12-24 hours; and carrying out vacuum freeze drying on the frozen solution to obtain the polylactic acid foam. The obtained steric composite polylactic acid foam has a uniform micro-nano multilevel structure, excellent cyclic compression performance, high steric composite content, low production cost, simple operation, environmental protection and excellent oil-water separation capability.

Description

technical field [0001] The invention belongs to the field of functional materials, and relates to a polylactic acid foam material, in particular to a stereocomplex polylactic acid foam material for oil-water separation and a preparation method thereof. Background technique [0002] In recent years, frequent oil spill accidents have caused serious environmental pollution and seriously affected people's production and life. Oil-water separation has gradually become one of the research focuses of scientists. At present, the use of oil-absorbing materials is a very effective solution to the pollution problems such as oil slicks and oily sewage on the sea. Although these oil-absorbing materials have excellent oil-water separation effects, most of them are chemically synthesized polymer materials. It cannot be degraded or is difficult to degrade under natural conditions, which causes great difficulties for the subsequent post-processing of waste materials. Conventional treatment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L67/04B01J20/26B01J20/28B01J20/30B01D17/022
CPCY02A20/204
Inventor 刘宪虎张明涛袁焕潘亚敏刘春太
Owner ZHENGZHOU UNIV
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