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Method of depolymerizing polyethylene terephthalate and process for producing polyester resin

A technology of polyethylene terephthalate and polyester resin is applied in the field of depolymerization of polyethylene terephthalate and the manufacture of polyester resin to achieve the effect of shortening time and good heat transfer efficiency

Inactive Publication Date: 2005-05-18
KUBOTA CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the above method, in order to keep the molten state of R-PET in the reaction vessel, the reaction vessel must be kept above the melting point of R-PET, and the depolymerization reaction takes several hours

Method used

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  • Method of depolymerizing polyethylene terephthalate and process for producing polyester resin
  • Method of depolymerizing polyethylene terephthalate and process for producing polyester resin
  • Method of depolymerizing polyethylene terephthalate and process for producing polyester resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Extruder: Kurimoto Iron Works Co., Ltd. S-1 counter-rotating twin-screw extruder

[0071] Extruder temperature: 220℃~280℃

[0072] Materials: (i) Waste vial flakes (R-PET): manufactured by Yonopettobotollisaikuru Co., Ltd.

[0073] (ii) Propylene glycol

[0074] (iii) Catalyst: dibutyltin oxide

[0075] method

[0076] (1) After bringing the extruder to a predetermined temperature, a material in which propylene glycol and dibutyltin oxide were previously added to R-PET was supplied.

[0077] (2) The melted R-PET undergoing depolymerization reaction through the extruder is solidified at normal temperature. The molecular weight and melting point of the cured product were measured for each of the added substances. As shown in Table 1, the molecular weight and melting point of the added substances were both lowered.

[0078] add content

molecular weight

Melting point (°C)

a)

Just R-PET

10900

240～250

b)

25% by m...

Embodiment 2

[0082] Extruder: SRV-P40 / 30 manufactured by Nippon Yuki Co., Ltd.

[0083] Single screw extruder L / D=22

[0084] Extruder temperature: 220℃~280℃

[0085] Materials: (i) Waste vial flakes (R-PET): manufactured by Yonopettobotollisaikuru Co., Ltd.

[0086] (ii) Propylene glycol

[0087] (iii) Catalyst: dibutyltin oxide

[0088] method

[0089] (1) The extruder is brought to a predetermined temperature, and the above-mentioned raw materials are supplied.

[0090] (2) The molten R-PET passed through the extruder is solidified at room temperature. The molecular weight and melting point of the cured product were measured for each of the added substances. As shown in Table 2 below, the molecular weight and melting point of each added substance decreased.

[0091] add content

Embodiment 3

[0093] Extruder: PMT 47-III manufactured by IKG Corporation

[0094] Twin-screw extruder L / D=30

[0095] Extruder temperature: 220°C-280°C

[0096] Materials: (i) Waste vial flakes (R-PET): Yonopetsutobotollisaikuru Co., Ltd.

[0097] (ii) Propylene glycol

[0098] (iii) Catalyst: dibutyltin oxide, tetraisopropoxy titanate

[0099] method

[0100] (1) The extruder is brought to a predetermined temperature, and the above-mentioned raw materials are supplied.

[0101] (2) For addition, 0.3% by mass of the catalyst was previously added to R-PET, and 50% by mass of propylene glycol was quantitatively supplied from the middle of the extruder using a metering pump.

[0102] (3) Melting R-PET through the extruder is white and solidified at room temperature, and the molecular weight and melting point of the solidified product are measured. The results are shown in Table 3 below.

[0103] add content

[0104] (4) Add PET oligomer b) of Table 3 as the obtained PET oli...

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Abstract

The present invention relates to a method for depolymerizing polyethylene terephthalate and a method for producing polyester resin. When the polyethylene terephthalate used for recovery is heated and melted for depolymerization, use a single or multiple extruders, or use an extruder and a reactor located at the outlet of the extruder to carry out the process at one time It is used for heating, melting, and depolymerization of recovered polyethylene terephthalate. When producing polyester resin, the reaction material is irradiated with microwaves to accelerate the heating of the reaction material and at the same time accelerate its esterification reaction.

Description

technical field [0001] The present invention relates to a method for depolymerizing polyethylene terephthalate for recycling and a method for producing polyester resin. Hereinafter, polyethylene terephthalate is abbreviated as "PET", and polyethylene terephthalate used for recycling is abbreviated as "R-PET". Background technique [0002] It is known to use R-PET as the original method for preparing unsaturated polyester resins. [0003] As this method, generally put dibasic alcohol into the reaction vessel, add R-PET in batches at a temperature below the boiling point of dibasic alcohol to carry out alcoholysis, after forming oligomers, add the desired amount of α-β Saturated polybasic acid (or its anhydride) is polycondensed to generate unsaturated alkyd, which is dissolved in the styrene monomer which acts as a crosslinking agent. [0004] The disadvantage of this method is that since the temperature cannot be raised above the boiling point of dibasic alcohols, it takes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/12C08J11/24
CPCC08J11/24C08J2367/02Y02W30/62
Inventor 玉田亮三井口泰宏吉村延大塚伸一
Owner KUBOTA CORP
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