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Method and device for continuously preparing high-quality PBAT

A high-quality, catalyst technology, applied in the field of continuous preparation of high-quality PBAT, can solve the problems of high acid value and melt index, wide relative molecular weight distribution, difficult to control, poor color and so on, achieve low acid value and melt index, relative molecular weight distribution. Narrow, improve the effect of color defects

Pending Publication Date: 2021-08-10
SHANDONG DAWN POLYMER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although PBAT has good application value and is in a stage of rapid development, the technology for real industrialized production is still monopolized by several large companies such as BASF. Even so, there are still a series of problems in the PBAT produced by the existing technology, such as many impurities, Wide relative molecular weight distribution is difficult to control, high acid value and melt index, poor color, etc. These problems will affect the application of PBAT downstream products
Therefore, the polymerization process and method and quality of PBAT still need to be improved

Method used

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  • Method and device for continuously preparing high-quality PBAT
  • Method and device for continuously preparing high-quality PBAT
  • Method and device for continuously preparing high-quality PBAT

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Add the PTA / BDO and AA / BDO slurries to the first esterification tank respectively, add 0.3wt% catalyst, carry out the esterification reaction at 195°C and 160°C respectively, and then put the esterified product in the first esterification tank Transfer to the second esterification tank, add 0.3wt% catalyst, and the esterification rate reaches more than 98% at this time, then transfer the esterified product in the second esterification tank to the polycondensation reactor, add 0.15wt% catalyst, 1wt% stabilizer UV-944 and tris (2,4-di-tert-butylphenyl) phosphite (mass ratio 1:4), and reacted at 250 ° C for 90 minutes, and the PBAT melt obtained by polycondensation reaction was transported to Viscosification reactor is used to increase viscosity to obtain high molecular weight PBAT melt, and finally PBAT melt enters pelletizing system to obtain PBAT resin.

Embodiment 2

[0057] PTA / BDO and AA / BDO slurries were added to the first esterification tank, 0.4wt% catalyst was added, and the esterification reaction was carried out at 195°C and 160°C respectively, and the esterified product in the first esterification tank was Transport to the second esterification tank, add 0.25wt% catalyst, and the esterification rate reaches more than 98% at this time, then transport the esterified product in the second esterification tank to the polycondensation reactor, add 0.2wt% catalyst, 1.5wt% % stabilizer UV-770 and tris (2,4-di-tert-butylphenyl) phosphite (mass ratio is 1:3), and reacted at 250°C for 90 minutes, and the PBAT melt obtained by polycondensation reaction was transported Go to the thickening reaction kettle for thickening to obtain high molecular weight PBAT melt, and finally the PBAT melt enters the pelletizing system to obtain PBAT resin.

Embodiment 3

[0059] PTA / BDO and AA / BDO slurries were added to the first esterification tank, 0.4wt% catalyst was added, and the esterification reaction was carried out at 195°C and 160°C respectively, and the esterified product in the first esterification tank was Transport to the second esterification tank, add 0.2wt% catalyst, and the esterification rate reaches more than 98% at this time, then transport the esterified product in the second esterification tank to the polycondensation reactor, add 0.2wt% catalyst, 0.8wt% % stabilizer UV-119FD and bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite (mass ratio is 2:1), and reacted at 250°C for 90min, the PBAT melt obtained through polycondensation The body is transported to the thickening reactor for thickening to obtain high molecular weight PBAT melt, and finally the PBAT melt enters the pelletizing system to obtain PBAT resin.

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Abstract

The invention relates to a method for continuously preparing high-quality PBAT and a preparation device. The method comprises the steps of 1, continuously feeding slurry prepared from BDO and PTA into an esterification reaction kettle, continuously feeding slurry prepared from BDO and AA into the esterification reaction kettle, and stopping the reaction when the esterification rate is monitored to be 90% or above; 2, continuously feeding an ester of BDO and PTA and an ester of BDO and AA obtained in the step 1 into a pre-polymerization reaction kettle, and stopping the reaction when the esterification rate is monitored to be 98% or above; 3, continuously feeding a pre-polyesterified product obtained in the step 2 into a polycondensation reaction kettle through a melt pump to obtain a high polymer PBAT melt; and 4, continuously feeding the high polymer PBAT melt obtained in the step 3 into a tackifying reaction kettle through a melt pump, feeding the high polymer PBAT melt into a pelletizing system after tackifying is completed, and pelletizing to obtain PBAT resin. The PBAT is prepared by adopting the device and the method disclosed by the invention, and particularly, a compound stabilizer is added in a polymerization process, so that the color and luster defects of PBAT slices can be well improved.

Description

technical field [0001] The invention belongs to the field of polymer material preparation, in particular to a method and device for continuously preparing high-quality PBAT. Background technique [0002] Polybutylene terephthalate adipate (PBAT) is a copolymer of butylene adipate and butylene terephthalate, which is a thermoplastic biodegradable plastic with the characteristics of both PBA and PBT. Compared with traditional biodegradable polyesters, PBAT has a higher melting point and has good mechanical ductility, processability and physical and mechanical properties. It can be processed by injection molding, blow molding, blown film and other molding methods, so It has a wide range of uses, not only in the field of packaging, but also in the field of medicine and health and agriculture. It meets the strategic requirements of environmental protection and sustainable development. One of the degradable materials. [0003] Although PBAT has good application value and is in a...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/78C08K5/526C08K5/3435B29B9/02
CPCC08G63/183C08G63/785C08K5/526C08K5/3435B29B9/02
Inventor 于晓宁田洪池郝艳平陈军王凡刘杨陈青葵张兴忠
Owner SHANDONG DAWN POLYMER CO LTD
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