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Method for continuously preparing biodegradable plastic

A technology of biodegradable plastics and slurry, which is applied in the field of continuous preparation of biodegradable plastics, can solve intermittent problems, achieve the effects of reducing pollution, high intrinsic viscosity, and promoting sustainable development

Active Publication Date: 2012-07-11
SHANGHAI JUYOU CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the research on PBS polyester and its copolyester has become a hot spot of scientific research, the technology for real industrialized production is still monopolized by several large companies such as BASF. Even so, the methods used by these companies to produce PBS copolyester are mostly for batch process

Method used

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  • Method for continuously preparing biodegradable plastic
  • Method for continuously preparing biodegradable plastic

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Succinic acid and 1,4-butanediol are formulated into a slurry at a molar ratio of 1:1.8, and then continuously fed into the first esterification tank at a flow rate of 475kg / h for esterification reaction, at an absolute pressure of 80kPa , at a temperature of 140°C, continuously add 0.1kg / h of tetrabutyl titanate, stay for 2 hours, and the obtained first esterification product enters the second esterification kettle for esterification reaction. ℃, stay for 1h, the obtained second esterified product is continuously sent to the first polycondensation tank for polycondensation reaction, and at the same time, 0.1kg / h ethylene glycol antimony is injected into the pipeline, and the temperature is raised to 230 ℃, under the condition of a vacuum of 5kPa , stay for 30min, remove the by-products, and then enter the second polycondensation tank for the obtained prepolymer to carry out polycondensation reaction. The reaction vacuum is 80Pa, and the residence time is 120min. °C, th...

Embodiment 2

[0030] 350kg / h terephthalic acid, 350kg / h succinic acid and 800kg / h 1,4-butanediol are continuously added to the slurry tank to make a slurry, and then continuously sent to the first esterification tank for esterification Reaction, at an absolute pressure of 60kPa and a temperature of 240°C, add 0.4kg / h tetrabutyl titanate, stay for 4 hours, remove the by-product water, and enter the first esterified product into the second esterification kettle for esterification reaction , at an absolute pressure of 40kPa and a temperature of 240°C, stay for 2 hours to remove by-product water, and the obtained second esterified product enters the first polycondensation tank for polycondensation reaction, while adding 0.1kg / h ethylene glycol antimony, and raising the temperature To 250°C, under the condition of a vacuum of 3kPa, stay for 120min, remove the by-products, and then enter the second polycondensation tank for polycondensation reaction of the obtained prepolymer, the reaction vacuum ...

Embodiment 3

[0032] 350kg / h terephthalic acid, 500kg / h adipic acid and 650kg / h 1,4-butanediol are continuously added to the slurry tank to make a slurry, and then continuously sent to the first esterification tank for esterification For the reaction, at an absolute pressure of 90kPa and a temperature of 210°C, add 0.3kg / h of tetrabutyl titanate, stay for 1.5h, remove the by-product water, and enter the first esterification product into the second esterification kettle Esterification reaction, at an absolute pressure of 80kPa and a temperature of 215°C, stay for 2.5 hours to remove by-product water, and the obtained second esterified product enters the first polycondensation tank for polycondensation reaction, and simultaneously adds 0.2kg / h ethylene glycol Antimony, and heated up to 220 ° C, under the condition of a vacuum of 1.5kPa, stay for 70min, remove by-products, the obtained prepolymer enters the second polycondensation tank for polycondensation reaction, the reaction vacuum is 100Pa...

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Abstract

The invention discloses a method for continuously preparing biodegradable plastic, which consists mainly of the steps of continuously adding slurry prepared from one or more dibasic acid and one or more diol into a first esterification kettle, allowing esterification to obtain homopolyester or copolyester oligomer, allowing further esterification in a second esterification kettle to obtain an esterified substance, continuously introducing the esterified substance to a first condensation kettle, allowing condensation to remove small molecule under the condition of low vacuum and obtain prepolymer, continuously introducing the prepolymer to a high-vacuum second condensation kettle, allowing condensation to remove small molecule and obtain polymer, and subjecting the polymer to continuous thickening and polymerization in a final condensation kettle having a thickening function to obtain biodegradable plastic sections with high molecular weight and melting index smaller than 5. The inventive process has simple operation and high automation degree, and the obtained biodegradable plastic sections have uniform quality and no batch difference.

Description

technical field [0001] The invention belongs to the technical field of polymer material synthesis, and more specifically, the invention particularly relates to a method for continuously preparing biodegradable plastics. Background technique [0002] The petrochemical-based polymer synthetic chemical industry born in the last century has changed human life. Since its inception, polymer materials have provided many new materials with excellent performance for people's production and life due to their multiple functions and excellent practicability. As one of the three major synthetic materials, in the field of plastics, a variety of lightweight, inexpensive, and high-performance polymer materials have spread throughout the industry and every corner of our lives, bringing unprecedented convenience to life. However, with the mass production and consumption of plastic products in industry and life, while bringing about material civilization, the waste generated after its use has...

Claims

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Application Information

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IPC IPC(8): C08G63/16C08G63/183C08G63/78
Inventor 汪少朋黄曦辰郝兴武甘胜华郑弢
Owner SHANGHAI JUYOU CHEM ENG
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