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Method for preparing pla-ppc-pu copolymerized gold by utilizing pla reclaimed material and its product and application

A PLA-PPC-PU, PPC-PU technology, applied in the direction of plastic recycling, recycling technology, additive processing, etc., can solve the problems of by-product cyclic carbonate residue, unavoidable PLA degradation, metal catalyst residue, etc. Achieve the effect of solving poor reactivity, high cost and high acid value

Active Publication Date: 2022-04-01
MIRACLL CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent specification with the publication number CN 107603168 A discloses a polylactic acid-based film and a preparation method thereof. This patented technology still uses fresh high-molecular-weight polylactic acid instead of oligomers of PLA reclaimed materials after alcoholysis, and finally The product is also a physical blend of several materials such as PLA, PBAT, and PPC-based TPU. There is no chemical reaction in the preparation process, and it is difficult to avoid the degradation of PLA and PPC segments during the extrusion blending process. Moreover, the patented technology The PPC in the used methyl ethylene carbonate (i.e. PPC)-polyurethane copolymer is still obtained by copolymerization of carbon dioxide and propylene oxide. There are problems such as the above-mentioned complex process, metal catalyst residue, and by-product cyclic carbonate residue, which affect its performance. Performance and subsequent application with polyurethane block copolymerization, etc.

Method used

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  • Method for preparing pla-ppc-pu copolymerized gold by utilizing pla reclaimed material and its product and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1) Using discarded PLA reclaimed material, GPC test molecular weight is 80,000 g / mol, take 100kg and add it to the reaction kettle with chloroform, heat up to 50°C and stir to dissolve, keep the chloroform condensed and refluxed, add 3.59kg 1,2-propanediol and 6.5g of 4-dialkylaminopyridine, alcoholysis reaction for 3.5h, then warmed up to 75°C and vacuumed to -0.09MPa, removed the solvent chloroform and condensed and collected into the storage tank for later use, took samples from the kettle to remove the solvent in a vacuum oven The obtained hydroxyl-terminated low-molecular-weight PLA liquid has a hydroxyl value of 27.91 mgKOH / g, an acid value of 0.38 mgKOH / g, and a molecular weight of 4020 g / mol.

[0042] 2) Add 100kg of propylene carbonate and 2kg of 1,6-hexanediol to the reaction kettle and stir evenly at room temperature, add 10.2g of organic phosphazene catalyst, react for 6h, heat up to 90°C and vacuumize for 2h to remove low boilers, and get The PPC that adopt...

Embodiment 2

[0045] 1) Using discarded PLA reclaimed material, GPC test molecular weight is 100,000 g / mol, take 100kg and add it to the reaction kettle with chloroform, heat up to 50°C and stir to dissolve, keep the chloroform condensed and refluxed, add 1.12kg ethylene glycol and 8.5g 4-Dialkylaminopyridine, alcoholysis for 3 hours, then heated to 75°C and vacuumed to -0.09MPa, removed the solvent chloroform and condensed and collected in a storage tank for later use. Samples were taken from the kettle and tested after removing the solvent in a vacuum oven The hydroxyl value of low molecular weight PLA liquid terminated by hydroxyl group is 11.2 mgKOH / g, the acid value is 0.32 mgKOH / g, and the molecular weight is 10017 g / mol.

[0046] 2) Add 100kg of propylene carbonate and 1.575kg of ethylene glycol into the reaction kettle and stir evenly at room temperature, add 12.5g of organic phosphazene catalyst, react for 7 hours and then raise the temperature to 90°C for 2 hours to remove low boil...

Embodiment 3

[0049] 1) Using discarded PLA reclaimed material, GPC test molecular weight is 115,000 g / mol, take 100kg and add it to the reaction kettle with chloroform, heat up to 50°C and stir to dissolve, keep the chloroform condensed and refluxed, add 1.14kg ethylene glycol and 9.7g 4-Dialkylaminopyridine, alcoholysis reaction for 2.5h, then heated to 75°C and vacuumed to -0.09MPa, the solvent chloroform was removed and condensed and collected in a storage tank for later use. Samples in the kettle were tested after removing the solvent in a vacuum oven The hydroxy-terminated low-molecular-weight PLA liquid has a hydroxyl value of 9.32 mgKOH / g, an acid value of 0.3 mgKOH / g, and a molecular weight of 12038 g / mol.

[0050] 2) Add 120kg of propylene carbonate and 1.685kg of 1,4-butanediol to the reaction kettle and stir evenly at room temperature, add 11.4g of organic phosphazene catalyst, react for 6 hours, then heat up to 90°C and vacuum for 2 hours to remove low boilers, Obtain the PPC t...

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Abstract

The invention discloses a method for preparing PLA-PPC-PU copolymerized gold by using recycled PLA materials, as well as its product and application. The method comprises: mixing recycled PLA material with chloroform and heating up to dissolve, then adding dihydric alcohol and a catalyst to carry out alcoholysis reaction, during the reaction process, chloroform is condensed and refluxed, and the solvent is removed after the reaction to obtain hydroxyl-terminated low-molecular-weight PLA liquid, which The molecular weight is 3000-15000g / mol, the hydroxyl value is 7.5-37.5mgKOH / g; PPC and polyols are mixed at a mass ratio of 6-10:1 and heated to 100-120°C for dehydration, then cooled to 70-90°C, adding two Isocyanate is reacted to obtain PPC-PU liquid; the hydroxyl-terminated low-molecular-weight PLA liquid is poured into a twin-screw extruder, vacuumed and devolatilized, and then NCO-terminated PPC-PU is added to the second exhaust port of the twin-screw extruder. The PU liquid is extruded through the subsequent screw copolymerization reaction, and pelletized underwater to obtain PLA-PPC-PU copolymerized gold.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a method for preparing PLA-PPC-PU copolymerized gold by using recycled PLA materials, as well as its products and applications. Background technique [0002] With the enhancement of environmental awareness, the green consumer market is gradually expanding, and the development and application of biodegradable plastics that save resources, are easy to recycle, and are easy to degrade have gradually attracted everyone's attention. Polylactic acid (PLA), polypropylene carbonate (PPC) ) are all biodegradable plastics that are currently used in research. [0003] With the increasing use of PLA in the market, composting and natural microbial degradation alone can no longer meet the requirements, and degrading PLA into carbon dioxide and water of little use is also a waste from the perspective of recycling, so Recycling of PLA waste products needs to be considered. [0004] A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/42C08G18/44C08G18/48C08J11/24C08L75/04B33Y70/00C08L67/04
CPCC08G18/428C08G18/44C08G18/4238C08G18/4202C08G18/4854C08G18/4018C08J11/24C08L75/04B33Y70/00C08J2367/04C08G2230/00C08L2203/16C08L2203/02Y02W30/62
Inventor 刘德富宋红玮张生傅恺凡陈宏
Owner MIRACLL CHEM
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