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Production method for continuously producing high-viscosity polymer

A production method and polymer technology, applied in chemical instruments and methods, chemical/physical processes, chemical/physical/physical chemical processes, etc., can solve the problem that the viscosity of polymers cannot be further improved, increase investment costs and production costs, and affect the final Product quality and other issues, to achieve the effect of easy to form stretch film and sagging film, reduce high temperature residence time, and improve surface renewal rate

Active Publication Date: 2020-08-21
ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, when the polymer liquid film and the annular disc form a whole to rotate together, the flow of the subsequent polymer is blocked, and the surface renewal and polymerization reaction of the subsequent polymer are also restricted, so that the viscosity of the subsequent polymer cannot be further increased.
Therefore, when using the traditional disc reactor to produce polymers with higher viscosity, we can only add another set of viscosifying reactors, which makes the production process longer, and the residence time of the polymer at high temperature is prolonged, which affects the quality of the final product. quality, increased investment costs and production costs

Method used

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  • Production method for continuously producing high-viscosity polymer
  • Production method for continuously producing high-viscosity polymer
  • Production method for continuously producing high-viscosity polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Embodiment 1 (ring disc stirrer+spiral blade stirrer)

[0087] A production method for continuously producing high-viscosity PET polymers, comprising the following steps: continuously feeding a PET prepolymer melt with a material intrinsic viscosity of 0.25 dL / g into the final polycondensation reactor of the present invention, at a temperature of 275° C. , under the condition of an absolute pressure of 120Pa, the reaction stays for 120min, and is discharged from the discharge port to prepare a high-viscosity PET polymer with an intrinsic viscosity of 0.90dL / g. Wherein in the polycondensation reactor, the prepolymer melt is successively processed by the first agitator and the second agitator with different rotating speeds. The rotational speed range of the first agitator is 5.8 rpm, and the rotational speed range of the second agitator is 3.5 rpm.

[0088] Above-mentioned final polycondensation reactor is a kind of polycondensation reactor of high viscosity polymer, as ...

Embodiment 2

[0094] Embodiment 2 (cage frame type mesh pan stirrer + helical blade type tube pan stirrer)

[0095] A production method for continuous production of high-viscosity PTT polymers, comprising the following steps: continuously feeding a PTT prepolymer melt with a material intrinsic viscosity of 0.30dL / g into a final polycondensation reactor at a temperature of 260°C and an absolute pressure of Under the condition of 100Pa, the reaction stays for 150min and is discharged from the discharge port to prepare a high-viscosity PTT polymer with an intrinsic viscosity of 1.05dL / g. Wherein, in the final polycondensation reactor, the prepolymer melt is successively processed by the first agitator and the second agitator with different rotating speeds. The speed range of the first stirrer was 3.2 rpm, and the speed range of the second stirrer was 2.4 rpm.

[0096] The difference between the polycondensation reactor of the present embodiment and embodiment 1 is:

[0097] The cross-section...

Embodiment 3

[0100] Embodiment 3 (ring disc stirrer+spiral ring tube stirrer)

[0101] A production method for continuous production of high-viscosity PTT polymers, comprising the following steps: continuously feeding a PTT prepolymer melt with a material intrinsic viscosity of 0.30dL / g into a final polycondensation reactor at a temperature of 260°C and an absolute pressure of Under the condition of 100Pa, the reaction stays for 150min and is discharged from the discharge port to prepare a high-viscosity PTT polymer with an intrinsic viscosity of 1.05dL / g. Wherein, in the final polycondensation reactor, the prepolymer melt is successively processed by the first agitator and the second agitator with different rotating speeds. The speed range of the first stirrer was 5.6 rpm, and the speed range of the second stirrer was 2.1 rpm.

[0102] The difference between the polycondensation reactor of this embodiment and that of Embodiment 1 is that: the second agitator adopts a helical loop agitato...

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Abstract

The invention relates to the field of polymer production, and discloses a production method for continuously producing a high-viscosity polymer. The method comprises the following steps: continuouslyfeeding a prepolymer melt with the intrinsic viscosity of 0.10 to 0.45 dL / g into a final polycondensation reactor; reacting and standing for 30 to 250 min under the conditions that the temperature is220 to 295 DEG C and the absolute pressure is 20 to 2000 Pa so as to prepare the high-viscosity polymer with the intrinsic viscosity of 0.7 to 1.15 dL / g, wherein in the final polycondensation reactor,the prepolymer melt is sequentially treated by a first stirrer and a second stirrer with different rotating speeds. Two stirrers with different rotating speeds and different structures are arranged in the same polycondensation reactor, so a liquid film can still be efficiently updated when the viscosity of the polymer is high, the mixing and mass transfer effects during high viscosity are effectively improved, the intrinsic viscosity of the polymer at the outlet of the reactor can be effectively improved, and the production capacity and the product range of the polycondensation reactor are effectively improved.

Description

technical field [0001] The invention relates to the field of polymer production, in particular to a production method for continuously producing high-viscosity polymers. Background technique [0002] The current production and preparation of polytrimethylene terephthalate (PTT), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), butylene adipate terephthalate Among the final polycondensation reactors of alcohol ester (PBAT), polybutylene succinate (PBS) and other types of polyesters, the final polycondensation reactor is the key equipment in the entire production line and is the final polycondensation reactor for polyester polymerization. Disc reactors and cage frame reactors are widely used now. The viscosity of most of the existing reactors after polycondensation can reach 0.62~0.7dl / g. With the continuous development of new products, the viscosity of the material after polycondensation in the reactor is required to reach 0.95 dl / g or even higher. The t...

Claims

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Application Information

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IPC IPC(8): C08G63/78C08G63/183C08G63/16B01J19/18B01J19/20
CPCC08G63/785C08G63/78C08G63/183C08G63/16B01J19/18B01J19/20B01J19/0066B01J2219/182
Inventor 彭华锋贾振宇柳铭轩张保勇陈文
Owner ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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