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PETG (polyethylene terephthalate glycol) and method for preparing PETG from waste PET polyester

A polyester and waste technology, applied in the field of waste alcohol ester utilization, can solve the problems of large carbon emissions and consumption of original resources, achieve stable performance, reduce waste generation, and improve utilization rate

Pending Publication Date: 2022-08-05
福建赛隆科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the origin of petrochemical bases, the carbon emissions in the whole acquisition process are relatively large, and the consumption of primary resources is mainly

Method used

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  • PETG (polyethylene terephthalate glycol) and method for preparing PETG from waste PET polyester
  • PETG (polyethylene terephthalate glycol) and method for preparing PETG from waste PET polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Example 1: Preparation of recycled PETG chips

[0085] Preparation of DMT: Depolymerization of waste PET polyester to obtain BHET monomer, and the first transesterification reaction of BHET monomer and methanol to obtain DMT;

[0086] The variegated leftovers containing PET (86wt%) after impurity removal were made into aggregated pellets by a pelletizer system; the 100KG aggregated pellets were melted and extruded with a screw to form a melt; the melt was filtered by a melt filter and then transported to In the depolymerization kettle; additionally, 130KG of EG depolymerization solution and 0.02KG of depolymerization catalyst zinc acetate were metered into the depolymerization kettle into the depolymerization kettle, and the depolymerization reaction was carried out to obtain the BHET monomer.

[0087] First transesterification:

[0088]The first transesterification reaction between BHET monomer and 150KG methanol (MEOH) was carried out to obtain DMT;

[0089] The DMT...

Embodiment 2

[0102] The difference between Example 2 and Example 1 is: in the secondary transesterification step, the reaction temperature is controlled at 220 to 230 ° C; the prepolymer is generated: BHCT and BHET are removed from ethylene glycol to form a prepolymer, and the reaction temperature is controlled at 260 to 260 ° C. 270°C; prepolymer polymerization: the prepolymer is polymerized, and the reaction temperature is controlled at 295-305°C; vacuum is applied until the reaction pressure reaches 80 Pa (A).

[0103] Example 2 The product through the analysis index is: viscosity 0.736dl / g, chromaticity (L value 65.8, b value 0.6), is a transparent amorphous material, excellent index, good transparency, chemical corrosion resistance, impact resistance, easy to process injection molding , all meet the needs of market film applications, polyester bottle applications, etc.

Embodiment 3

[0105] The difference between Example 3 and Example 1 is: in the secondary transesterification step, the reaction temperature is controlled at 170 to 180 ° C; the prepolymer is generated: BHCT and BHET are removed from ethylene glycol to generate a prepolymer, and the reaction temperature is controlled at 240 to 180 ° C. 250°C; prepolymer polymerization: the prepolymer is polymerized, and the reaction temperature is controlled at 270-280°C; vacuum is applied until the reaction pressure reaches 40 Pa (A).

[0106] Example 3 The product through the analysis index is: viscosity 0.739dl / g, chromaticity (L value 65.1, b value 0.82), is a transparent amorphous material, excellent index, good transparency, chemical corrosion resistance, impact resistance, easy to process injection molding , all meet the needs of market film applications, polyester bottle applications, etc.

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Abstract

The invention relates to a method for preparing PETG (Polyethylene Terephthalate) from waste PET (Polyethylene Terephthalate), which comprises the following steps of: depolymerizing a PET waste polyester raw material to decompose into BHET (Bis HET); then carrying out ester exchange reaction with methanol (MEOH) to generate an intermediate molecule DMT (dimethyl terephthalate); the generated DMT is purified; after purification, carrying out esterification reaction on the refined DMT, 1, 4-cyclohexanedimethanol (CHDM) and ethylene glycol (EG) to obtain bis (hydroxymethyl) cyclohexyl methyl terephthalate (BHCT) and bis (hydroxyethyl) terephthalate (BHET); and carrying out polymerization reaction on the BHET and the BHCT to generate a macromolecular chain PETG polymer. According to the invention, the waste textiles can be regenerated, so that the use of petroleum resources is effectively reduced, and the generation of wastes is reduced; the utilization rate of the PET polyester is improved; the produced product PETG is stable and uniform in performance; the film has the advantages of good transparency, chemical corrosion resistance, impact resistance and easy processing and injection molding, and meets the requirements of film application, polyester bottle application and the like in the market.

Description

Technical field [0001] The present invention relates to the utilization of waste alcohol esters, and in particular to a kind of PETG and a method for preparing PETG from waste PET polyester. Background technique [0002] PETG material is a copolyester, mainly composed of terephthalic acid (PTA) or dimethyl terephthalate (DMT) or isophthalic acid (IPA) or dimethyl isophthalate (DMI) and 1 , copolymerized with 4-cyclohexanedimethanol (CHDM), neopentyl glycol (NPG), ethylene glycol (EG), etc.; polyethylene terephthalate-1,4-cyclohexanedimethanol ( PETG) copolyester contains cyclohexane units, which reduces the regularity of the entire molecular chain, thereby forming an amorphous and transparent copolyester, which also has good processing properties; in films, packaging, chemical products It is widely used in bottles, injection molding and fiber fields. [0003] Eastman Chemical Company in the United States and SK Company in South Korea have already matured and mass-produced ...

Claims

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Application Information

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IPC IPC(8): C08G63/199C08G63/78C08J11/24C08L67/02
CPCC08G63/199C08G63/78C08J11/24C08J2367/02Y02W30/62
Inventor 朱恩斌戴以明匡贞成黄祥瑞
Owner 福建赛隆科技有限公司
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