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Preparation method of polyurethane elastomer containing polylactic acid stereoisomerism composite crystal

A technology of stereocomposite crystallization and polyurethane elastomer, applied in the field of organic synthesis, can solve the problems of affecting the reproducibility of the reaction stability between batches of product performance, increase the viscosity of the reaction system, etc., to improve elasticity, improve comprehensive performance, Simple to use effects

Inactive Publication Date: 2017-12-15
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the process of preparing polyurethane elastomer by this method, since the reaction raw material diol already contains L-polylactic acid and D-polylactic acid structures, the raw materials are prone to stereocomplex crystallization during the reaction process, which increases the viscosity of the reaction system and affects the stability of the reaction. performance and reproducibility of product batch to batch

Method used

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  • Preparation method of polyurethane elastomer containing polylactic acid stereoisomerism composite crystal
  • Preparation method of polyurethane elastomer containing polylactic acid stereoisomerism composite crystal
  • Preparation method of polyurethane elastomer containing polylactic acid stereoisomerism composite crystal

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Embodiment 1

[0033] The preparation method of the polyurethane elastomer containing polylactic acid stereocomplex crystal in this embodiment is as follows:

[0034] 1. In the glove box, add dry L-lactide, 1,4-butanediol and stannous octoate into the reactor, and react at 120°C for 12 hours under the protection of nitrogen atmosphere; after the reaction, dissolve the product with chloroform , and then added to methanol at 10°C that is 10 times the mass of chloroform, suction filtered after precipitation, and vacuum-dried at 60°C for 24 hours to obtain L-polylactic acid diol with a molecular weight of 2000g / mol; the molar weight of stannous octoate is L-propyl 0.1% of the molar weight of lactide.

[0035] 2. 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 methanol at 10°C with 10 times the mass of chloroform, suction filtered after precipitation, a...

Embodiment 2

[0044] The preparation method of the polyurethane elastomer containing polylactic acid stereocomplex crystal in this embodiment is as follows:

[0045] 1. In the glove box, add dry L-lactide, 1,4-butanediol and stannous octoate into the reactor, and react at 120°C for 12 hours under the protection of nitrogen atmosphere; after the reaction, dissolve the product with chloroform , and then added to methanol at 10°C that is 10 times the mass of chloroform, suction filtered after precipitation, and vacuum-dried at 60°C for 24 hours to obtain L-polylactic acid diol with a molecular weight of 2000g / mol; the molar weight of stannous octoate is L-propyl 0.1% of the molar weight of lactide.

[0046] 2. 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 methanol at 10°C with 10 times the mass of chloroform, suction filtered after precipitation, a...

Embodiment 3

[0055] The preparation method of the polyurethane elastomer containing polylactic acid stereocomplex crystal in this embodiment is as follows:

[0056] Steps 1-4 refer to the preparation process of Example 1.

[0057] 5. Dissolve the polyurethane containing L-polylactic acid obtained in step 3 and the polyurethane containing D-polylactic acid obtained in step 4 in 30 times the volume of chloroform in a mass ratio of 4:1, stir at room temperature for 3 hours and then pour Put it into a polytetrafluoroethylene mold, let the solvent volatilize naturally, and dry it in a vacuum oven at 40°C for 24 hours to obtain a polyurethane elastomer containing polylactic acid stereocomplex crystals.

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Abstract

The invention discloses a preparation method of a polyurethane elastomer containing a polylactic acid stereoisomerism composite crystal. The preparation method comprises the following steps: preparing polylactic acid-based polyurethane with stereoisomerism by separately taking levorotatory polylactic acid polyol and dextrorotatory polylactic acid polyol as raw materials; secondly, uniformly mixing polyurethane containing levorotatory polylactic acid and dextrorotatory polylactic acid in the structure by adopting a solution blending method to prepare the polyurethane elastomer containing the polylactic acid stereoisomerism composite crystal. The mechanical strength, modulus and the other properties of the polyurethane elastomer are remarkably improved. The levorotatory polylactic acid and the dextrorotatory polylactic acid are separately introduced into a polyurethane structure according to a copolymerization method; then the stereoisomerism composite crystal is constructed in a polyurethane mixture by using the solution blending method. The method is simple in process, and the performance of a product is easy to regulate and control.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane elastomer containing polylactic acid stereocomplex crystals, belonging to the field of organic synthesis. Background technique [0002] Thermoplastic polyurethane elastomer, also known as thermoplastic polyurethane rubber, is mostly a block-type linear polymer that can be melted and plasticized after heating. Because of its structural designability, it has excellent mechanical properties, high elasticity, wear resistance and biocompatibility It has been widely used in industry, agriculture, transportation, medical treatment and other fields. [0003] With the society's increasing emphasis on environmental protection, the development and utilization of bio-based and degradable polymer materials has attracted widespread attention from researchers, but common polyurethane elastomers cannot degrade quickly in the natural environment. Aliphatic polyesters have attracted special attention from ...

Claims

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Application Information

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IPC IPC(8): C08G18/42C08G18/12C08G18/66C08G18/73C08G18/32C08G63/08C08G63/85C08L75/06
CPCC08G18/12C08G18/4202C08G18/4277C08G18/4283C08G18/664C08G18/73C08G63/08C08G63/85C08G2230/00C08L75/06C08L2201/06C08L2205/025C08G18/3206
Inventor 方华高王海利丁运生
Owner HEFEI UNIV OF TECH
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