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Preparation method of degradable TPU based on recycled PET

A technology of reflux distillation and reaction vessel, which is applied in the TPU field, can solve the problems of environmental protection restrictions, limited application range, and low recovery rate, and achieve the effect of eliminating environmental protection problems and wide application range

Active Publication Date: 2022-01-11
东莞市米儿塑胶原料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the existing PET recycling process, most of them can only produce some low-end products, and the scope of application is not wide
In addition, its recovery rate is not high, and it is generally remanufactured by highly polluting methods such as acidolysis, alcoholysis, and alkali hydrolysis, which are greatly restricted in terms of environmental protection.

Method used

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  • Preparation method of degradable TPU based on recycled PET
  • Preparation method of degradable TPU based on recycled PET
  • Preparation method of degradable TPU based on recycled PET

Examples

Experimental program
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preparation example Construction

[0045] The present invention provides a kind of degradable TPU preparation method based on reclaimed PET, and this preparation method comprises:

[0046] In the first stage, PET is hydrolyzed:

[0047] Step 1. Put PET, deionized water and zinc acetate into the reaction vessel of the reflux distillation device, raise the temperature to 75-85°C, pressurize to 22800-30400mmhg, and start the reflux distillation device;

[0048] Step 2. Heat up to 265-275°C and stir for more than 1.5h;

[0049] Step 3, cooling down to 75-85°C, filtering the material to obtain a high-viscosity substance;

[0050] Step 4. Heating up to 110°C-150°C, depressurizing to 645-655mmhg for more than 3 hours, and condensing the moisture of the high-viscosity substance in the low-temperature tower of the reflux distillation device;

[0051] Step 5, heat up to 215-225°C, pressurize to 745-755mmhg, obtain REG (Recycle EG, recovered ethylene glycol) and residue, and recover REG;

[0052] Step 6, cooling down t...

Embodiment 1

[0096] Provide a kind of degradable TPU preparation method based on recycled PET, this preparation method comprises:

[0097] In the first stage, PET is hydrolyzed:

[0098] Prepare ingredients according to the following weights:

[0099] PET 10kg,

[0100] 30kg deionized water,

[0101] Zinc acetate 0.01kg,

[0102] Step 1. Put PET, deionized water and zinc acetate into the reaction vessel of the reflux distillation device, raise the temperature to 80°C, pressurize to 22800mmhg, and start the reflux distillation device;

[0103] Step 2. Raise the temperature to 270°C, the heating rate is 30°C / 20min, the heating time is 2h, and stir for 2h;

[0104] Step 3, cooling down to 80°C, filtering the material to obtain a high-viscosity substance;

[0105] Step 4. First raise the temperature to 120°C for 2 hours, then raise the temperature to 140°C for 2 hours, decompress to 650mmhg for 4 hours, and condense the moisture of the high-viscosity substance in the low-temperature tower...

Embodiment 2

[0126] Provide a kind of degradable TPU preparation method based on recycled PET, this preparation method comprises:

[0127] In the first stage, PET is hydrolyzed:

[0128] Prepare ingredients according to the following weights:

[0129] PET 10kg,

[0130] 30kg deionized water,

[0131] Zinc acetate 0.01kg,

[0132] Step 1. Put PET, deionized water and zinc acetate into the reaction vessel of the reflux distillation device, raise the temperature to 80°C, pressurize to 22800mmhg, and start the reflux distillation device;

[0133]Step 2. Raise the temperature to 270°C, the heating rate is 30°C / 20min, the heating time is 2h, and stir for 2h;

[0134] Step 3, cooling down to 80°C, filtering the material to obtain a high-viscosity substance;

[0135] Step 4. First raise the temperature to 120°C for 2 hours, then raise the temperature to 140°C for 2 hours, decompress to 650mmhg for 4 hours, and condense the moisture of the high-viscosity substance in the low-temperature tower ...

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Abstract

A degradable TPU preparation method based on recycled PET comprises the following steps: a first stage: hydrolyzing PET; a second stage of preparing high-molecular dihydric alcohol; a third stage of preparing the degradable TPU. The degradable TPU formed by the preparation method disclosed by the invention has good degradation performance. The product is beneficial to environmental protection, also has good basic physical properties, can be suitable for high-end products, and is wide in application range. Meanwhile, when the PET is recycled, the modes of acidolysis, alkaline hydrolysis, alcoholysis and the like are not used, but a high-temperature deionized hydrolysis mode is used, so that the environmental protection problem in the manufacturing process is avoided, and waste caused by use of petrochemical raw materials is avoided.

Description

technical field [0001] The invention relates to the field of TPU, in particular to a method for preparing degradable TPU based on recycled PET. Background technique [0002] PET (polyethylene terephthalate) is a milky white or light yellow highly crystalline polymer with a smooth and shiny surface. Creep resistance, fatigue resistance, abrasion resistance and dimensional stability, small wear and high hardness, with the greatest toughness among thermoplastics, non-toxic, weather resistance, good chemical resistance stability, low water absorption, Resistant to weak acids and organic solvents, but not resistant to hot water immersion, not alkali resistant. At present, it is widely used in all aspects of life, such as common plastic bottles, which are usually made of PET materials. [0003] In order to avoid pollution to the environment, discarded PET products usually need to be recycled. However, for the existing PET recycling process, most of them can only produce some lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/32C08J11/14C08L67/02C08G63/672
CPCC08G18/664C08G18/4252C08G18/3206C08J11/14C08G63/672C08G2230/00C08J2367/02Y02W30/62
Inventor 贺平
Owner 东莞市米儿塑胶原料有限公司
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