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Method for producing homogeneously crystallized polycondensate pellets

A production method, technology of polycondensate, applied in the direction of coating etc.

Active Publication Date: 2012-11-14
POLYMETRIX AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage here is that a large amount of process gas needs to be used so that the polycondensate pellets can swirl over long process sections

Method used

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  • Method for producing homogeneously crystallized polycondensate pellets
  • Method for producing homogeneously crystallized polycondensate pellets

Examples

Experimental program
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Embodiment 1

[0071] A polyethylene terephthalate copolymer with 2 mol% IPA modification and an IV value of 0.6 dl / g was found in figure 2 The processing was carried out on the experimental framework shown in , where the melt was produced in a twin-screw extruder and no pump (5a) was used. The throughput was 200 kg / hour and the melt temperature at the outlet of the nozzle was 290°C. Granulation was carried out by underwater granulation to obtain a pellet weight of 18 mg. The liquid coolant used was water at 90°C. The average temperature of the pellets at the entrance into the treatment space was about 140°C. The processing space has been divided into two sections by two gas introduction devices, air at 170°C is introduced into the lower section to achieve a gas velocity (apparent flow rate) of about 1 m / sec, and then additional air at 180°C is introduced into the upper section In the section, a gas velocity of about 2 m / sec is achieved. Intense fluidization was produced in the upper se...

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Abstract

The invention relates to a method for the continuous production of semicrystalline polycondensate pellets. Said method comprises the following steps: producing a polycondensate material; shaping polycondensate pellets and solidifying the polycondensate melt in a liquid cooling medium, wherein the shaping of the pellets can be carried out prior to or after solidification; separating the pellets from the liquid cooling medium once the polycondensate pellets have cooled down to an average temperature that lies within the crystallization temperature range of the polycondensate; and crystallizing the pellets in a treatment chamber, the treatment gas being led in said treatment chamber in a countercurrent to the polycondensate pellets, the flow rate of the treatment gas being above the incipient fluidization point of the polycondensate pellets and the polycondensate pellets having a narrow dwell time spectrum in the treatment chamber.

Description

technical field [0001] The present invention relates to a process for the continuous production of semicrystalline polycondensate pellets. Background technique [0002] The prior art discloses methods in which semi-crystalline pellets can be produced from molten crystallizable polycondensates by cooling, pelletizing and heat treatment. Usually, the polycondensate is cooled to a temperature below its glass transition temperature and heated again for crystallization. Alternatively, the cooling can also be carried out to a suitable crystallization temperature, so that subsequent crystallization can be achieved without the introduction of external heat. [0003] (DE 103 49 016, Bruckmann; DE 10 2004 015 515, Otto et al.). However, these methods have the disadvantage that they cannot meet the requirements for a flexibly adjustable and uniform output quality (with respect to temperature and degree of crystallinity). An additional disadvantage is the frequent formation of agglom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B9/16
CPCC08G64/40B29B13/021C08G63/88B29B13/065B29B9/16B29B9/065B29B2009/165
Inventor F·尤塞比奥B·A·库尔伯特A·克里斯特尔P·洛克
Owner POLYMETRIX AG