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A kind of preparation method of polylactic acid modified material

A modified material and polylactic acid technology, applied in the field of preparation of polylactic acid modified materials, can solve the problems of low grafting efficiency, cumbersome preparation process, etc., and achieve the effects of strong controllability, simple and easy method, and improved toughness

Active Publication Date: 2021-01-15
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Researchers from Sichuan University (201810252684.2) reacted and blended elastomers, L-polylactic acid, D-polylactic acid and catalysts, connected polylactic acid molecules to elastomers through coupling and grafting reactions, and formed stereocomposites at the two-phase interface crystals, to obtain polylactic acid modified materials with high toughness, but the preparation process is too cumbersome, the grafting efficiency is low, and most of the d-polylactic acid exists in the matrix in a free form

Method used

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  • A kind of preparation method of polylactic acid modified material
  • A kind of preparation method of polylactic acid modified material
  • A kind of preparation method of polylactic acid modified material

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Experimental program
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Effect test

Embodiment 1

[0027] 1. In the glove box, add dry D-lactide, 1,4-butanediol and stannous octoate into the reactor, and react at 120°C for 12 hours under the protection of nitrogen atmosphere; Dissolved, then added to 10 times the mass of chloroform in cold methanol at 10°C, filtered after precipitation, and vacuum-dried at 60°C for 24 hours to obtain D-polylactic acid diol with a molecular weight of 2000g / mol, D-lactide and 1 , The mass ratio of 4-butanediol is 20:1, and the molar weight of stannous octoate is 0.1% of the molar weight of D-lactide.

[0028] 2. Dissolve the dry polycaprolactone diol and the D-polylactic acid diol prepared in step 1 in a molar ratio of 3:1 in toluene, then add hexamethylene diisocyanate and dilauric acid Dibutyltin acid, heated to 80°C for 6 hours to obtain isocyanate group-terminated polyurethane prepolymer; then add 1,4-butanediol to the reaction solution, and react at 80°C for 10 hours to obtain D-polylactic acid-containing polyurethane elastomer;

[002...

Embodiment 2

[0032] 1. In the glove box, add dry D-lactide, 1,4-butanediol and stannous octoate into the reactor, and react at 120°C for 12 hours under the protection of nitrogen atmosphere; Dissolved, then added to 10 times the mass of chloroform in cold methanol at 10°C, filtered after precipitation, and vacuum-dried at 60°C for 24 hours to obtain D-polylactic acid diol with a molecular weight of 2000g / mol, D-lactide and 1 , The mass ratio of 4-butanediol is 20:1, and the molar weight of stannous octoate is 0.1% of the molar weight of D-lactide.

[0033] 2. Dissolve the dry polycaprolactone diol and the D-polylactic acid diol prepared in step 1 in a molar ratio of 3:1 in toluene, then add hexamethylene diisocyanate and dilauric acid Dibutyltin acid, heated to 80°C for 6 hours to obtain isocyanate group-terminated polyurethane prepolymer; then add 1,4-butanediol to the reaction solution, and react at 80°C for 10 hours to obtain D-polylactic acid-containing polyurethane elastomer;

[003...

Embodiment 3

[0037] 1. In the glove box, add dry D-lactide, 1,4-butanediol and stannous octoate into the reactor, and react at 120°C for 12 hours under the protection of nitrogen atmosphere; Dissolved, then added to 10 times the mass of chloroform in cold methanol at 10°C, filtered after precipitation, and vacuum-dried at 60°C for 24 hours to obtain D-polylactic acid diol with a molecular weight of 2000g / mol, D-lactide and 1 , The mass ratio of 4-butanediol is 20:1, and the molar weight of stannous octoate is 0.1% of the molar weight of D-lactide.

[0038] 2. Dissolve the dry polycaprolactone diol and the D-polylactic acid diol prepared in step 1 in a molar ratio of 3:1 in toluene, then add hexamethylene diisocyanate and dilauric acid Dibutyltin acid, heated to 80°C for 6 hours to obtain isocyanate group-terminated polyurethane prepolymer; then add 1,4-butanediol to the reaction solution, and react at 80°C for 10 hours to obtain D-polylactic acid-containing polyurethane elastomer;

[003...

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Abstract

The invention discloses a preparation method of a polylactic acid modified material. The polylactic acid modified material is obtained by melt blending of a polyurethane elastomer containing poly-D-lactic acid and a poly-L-lactic acid matrix. A stereocomplex crystal is formed by the poly-D-lactic acid component on a molecular chain of the polyurethane elastomer and the poly-L-lactic acid matrix, the compatibility and interfacial interaction between two phases are improved, and the dispersion condition of the polyurethane elastomer in the poly-L-lactic acid matrix is greatly improved. The experimental results show that the toughness of the modified material is greatly improved, and the tensile strength is still maintained at a high level. The method is simple and easy to operate, is high incontrollability, can realize industrial production, and prepared composite materials are completely biodegradable and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of modification of degradable polymer materials, and in particular relates to a preparation method of polylactic acid modified materials. [0002] technical background [0003] Polylactic acid is a naturally degradable bio-based polymer, which is widely used in medical, industrial and food packaging industries due to its biocompatibility, biodegradability and excellent mechanical properties. However, polylactic acid materials still have the disadvantage of poor toughness, and it needs to be toughened and modified to meet the requirements for use as structural materials and expand its application fields. [0004] Polylactic acid is a kind of chiral polymer. When L-polylactic acid and D-polylactic acid are mixed, stereocomplex crystals can be formed. Stereocomplex crystals are crystals in which molecular chains are regularly arranged, and the interaction force between molecular chains is very strong. The form...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L75/06C08G18/66C08G18/42C08G18/32C08G18/12C08G63/08
Inventor 方华高陈旭王生林谢启铮周意杨丁运生
Owner HEFEI UNIV OF TECH
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