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US 12,655,266 B2Granted
Monomer composition for synthesizing recycled plastic, preparation method thereof, recycled plastic, and molded product using the same
AssigneeLG Chem, Ltd.
InventorsEunju Park, Ki Jae Lee, Jungmoon Bae, Jeongbin Lee, Mooho Hong
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Abstract
The present disclosure relates to a monomer composition for synthesizing recycled plastic that contains a high-purity aromatic diol compound recovered through recycling by chemical decomposition of a polycarbonate-based resin, a method for preparing the same, and a recycled plastic and molded product using the same.
Claims13
A monomer composition for synthesizing recycled plastic, comprising:
- an aromatic diol compound,
- wherein an impurity ratio according to the following Equation 1 is 1.2% or less,
- wherein the aromatic diol compound yield according to the following Equation 2 is more than 65%,
- wherein the monomer composition for synthesizing recycled plastic has a color coordinate L* of 96.4 or more, a color coordinate a* of 0.12 or less and a color coordinate b* of 0 to 1.82, and
- wherein the monomer composition is a recovered product from a polycarbonate-based resin:
- Impurity ratio={(Total peak area on liquid chromatography−Bisphenol A peak area on liquid chromatography)/Total peak area on liquid chromatography}×100, [Equation 1]
- Yield (%)=W1/W0 [Equation 2]
- wherein, in Equation 2, W0 is a mass of the aromatic diol compound obtained during 100% decomposition of the polycarbonate-based resin, and W1 is a mass of the aromatic diol compound actually obtained.
5 more elements
A method for preparing a monomer composition for synthesizing recycled plastic, the method comprising the steps of:
- depolymerizing a polycarbonate-based resin;
- adding a first base to adjust the pH of a depolymerization reaction product to be 12 or more;
- adding water after the addition of the first base to separate a carbonate precursor from the depolymerization reaction product;
- and
- adding an acid to adjust the pH of the depolymerization reaction product from which the carbonate precursor has been separated to be 2 or less,
- wherein the method further comprises a purification step of the depolymerization reaction product from which the carbonate precursor has been separated, and
- wherein the purification step comprises a recrystallization step, and an adsorption purification step.
4 more elements
Dependencies are inferred from the claim text.