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Preparation method of polylactic acid based hydrophobic thin film

A hydrophobic film, polylactic acid-based technology, which is applied in the field of preparation of polylactic acid-based hydrophobic films, can solve the problems of expensive production equipment, non-biodegradability, and non-hydrophobicity of the film, and achieves easy control of process conditions and simple and efficient preparation method. , the effect of large practical application value

Inactive Publication Date: 2018-09-21
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current production of hydrophobic films has problems such as expensive production equipment, harsh production conditions, and non-biodegradable
PLA film solves the problem of biodegradation. At present, the contact angle of common polylactic acid film is 70°-80°. This type of film is not hydrophobic and has weak self-cleaning ability.

Method used

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  • Preparation method of polylactic acid based hydrophobic thin film
  • Preparation method of polylactic acid based hydrophobic thin film
  • Preparation method of polylactic acid based hydrophobic thin film

Examples

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preparation example Construction

[0063] The preparation method of the polylactic acid-based hydrophobic film of the present invention firstly synthesizes a triblock copolymer (PDLA-PDMS-PDLA) of left-handed polylactic acid (PLLA), right-handed polylactic acid and polydimethylsiloxane. Dissolve PLLA in an organic solvent, spin-coat it on a glass slide to prepare a PLLA polymer film, and after a certain annealing treatment, then spin-coat the organic solvent of the triblock copolymer PDLA-PDMS-PDLA on the PLLA polymer film, After a certain annealing treatment, the polylactic acid-based hydrophobic film was prepared.

[0064] The preparation method of the polylactic acid-based hydrophobic film of the present invention adopts the isomer PDLA of the PLLA polymer and PDMS with certain hydrophobicity to form a three-block copolymer PDLA-PDMS-PDLA, and then the three-block copolymer PDLA -PDMS-PDLA film is prepared on the surface of PLLA polymer film substrate with relatively high molecular weight. The polylactic ac...

Embodiment 1

[0067] Synthesis of PLLA polymer

[0068] Purification of L-lactide: Purify the raw material L-lactide 3 times with ethyl acetate, mix 200g of L-lactide with ethyl acetate with a mass ratio of 75%, and make L-lactide in a water bath at 60°C. -Lactide is completely dissolved, cooled at room temperature and placed in the refrigerator overnight, and the ethyl acetate that has dissolved impurities is suction-filtered, purified three times according to the above method, and finally the purified L-lactide is placed in a cold trap device to vacuum for 24 hours , to remove all solvent.

[0069] Weigh the materials in the glove box, add 10g L-lactide, 260ul methyl lactate, 1ml stannous octoate, and 30ml solvent toluene into the three-necked flask, take it out from the glove box and place it in an oil bath at 130°C for reaction 3 ~5h. Add 100ml of anhydrous diethyl ether stored in the refrigerator for precipitation, and finally place the reaction solution in a cold trap device to vacu...

Embodiment 2

[0085] Synthesis of PLLA polymer

[0086] Purification of L-lactide: Purify the raw material L-lactide 3 times with ethyl acetate, mix 200g of L-lactide with ethyl acetate with a mass ratio of 75%, and make L-lactide in a water bath at 60°C. -Lactide is completely dissolved, cooled at room temperature and placed in the refrigerator overnight, and the ethyl acetate that has dissolved impurities is suction-filtered, purified three times according to the above method, and finally the purified L-lactide is placed in a cold trap device to vacuum for 24 hours , to remove all solvent.

[0087] Weigh the materials in the glove box, add 10g L-lactide, 260ul methyl lactate, 1ml stannous octoate, and 30ml solvent toluene into the three-necked flask, take it out from the glove box and place it in an oil bath at 130°C for reaction 3 ~5h. Add 100ml of anhydrous diethyl ether stored in the refrigerator for precipitation, and finally place the reaction solution in a cold trap device to vacu...

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Abstract

The invention discloses a preparation method of a polylactic acid based hydrophobic thin film. The preparation method comprises the following steps: preparing a poly-L-lactic acid polymer solution into a poly-L-lactic acid polymer thin film; spin-coating a triblock copolymer PDLA (Poly(D-lactic acid))-PDMS (Polydimethylsiloxane)-PDLA solution on a poly-L-lactic acid polymer thin film matrix; carrying out annealing treatment to obtain the polylactic acid based hydrophobic thin film. The preparation method of the polylactic acid based hydrophobic thin film is simple, efficient and technologicalconditions are easy to control and the uniform hydrophobic thin film can be prepared, so that the preparation method has relatively great actual application value.

Description

technical field [0001] The invention relates to the technical field of films, in particular to a degradable plastic polylactic acid-based film, in particular to a method for preparing a polylactic acid-based hydrophobic film. Background technique [0002] At present, the widespread use of plastic film products has caused serious pollution to the ecological environment, and petroleum resources, the main source of plastics, are becoming increasingly tense. Therefore, the development and use of biodegradable materials has received great attention based on the consideration of sustainable utilization of energy and environmental protection. [0003] Among many biodegradable materials, polylactic acid (PLA) is the most promising, because of its good compatibility, degradation performance, mechanical properties and transparency. The biggest feature of PLA products is that they can eventually degrade into CO in the natural environment 2 and H 2 O, so it can be called a veritable ...

Claims

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Application Information

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IPC IPC(8): C08G77/445C08G63/06C08G63/85C08G63/83C08J5/18C08J7/00C08L67/04C08L83/10
CPCC08G63/06C08G63/823C08G77/445C08J5/18C08J7/08C08J2367/04C08J2383/10C08J2467/04C08J2483/10
Inventor 唐颂超吴单王婷兰姚远王刚毕伯威王婧琳张文凭华启侠
Owner EAST CHINA UNIV OF SCI & TECH
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