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Production process of high-uniformity high-viscosity SSP (Solid State Polycondensation) polyester chip

A polyester chip and production process technology, applied in the field of chemical fiber production, can solve the problems that the SSP process cannot further improve the material flow speed, the uniformity of the chip viscosity is poor, and the production cycle is too long, so as to achieve rich process adjustment means and uniform chip crystallinity. , the effect of increasing the pre-reaction time

Active Publication Date: 2012-05-23
ZHEJIANG GUXIANDAO POLYESTER DOPE DYED YARN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Due to the limitation of the pre-crystallizer and reactor, it is difficult to increase the intrinsic viscosity of slices produced by traditional SSP after a certain level. It is quite difficult to prepare slices with a viscosity above 1.05dl / g or even 1.07dl / g of;
[0006] 2. The viscosity uniformity of slices produced by traditional SSP is poor, and the intrinsic viscosity unevenness is generally around ±0.25dl / g or even higher;
[0007] 3. Due to the limitation of equipment, the traditional SSP process cannot further increase the material flow rate, resulting in defects such as long production cycle and low production capacity.

Method used

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  • Production process of high-uniformity high-viscosity SSP (Solid State Polycondensation) polyester chip
  • Production process of high-uniformity high-viscosity SSP (Solid State Polycondensation) polyester chip
  • Production process of high-uniformity high-viscosity SSP (Solid State Polycondensation) polyester chip

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Embodiment 1

[0036] Embodiment 1: Production of high-uniformity and high-viscosity slices (viscosity at 1.07~1.09dl / g):

[0037]The low-viscosity chips with a viscosity of 0.67dl / g are sent from the polymer master sheet silo to two pre-crystallizers respectively. The temperature of the pre-crystallizers is controlled at 175-177°C, and the crystallization time is controlled at 12 minutes. Due to the addition of a pre-crystallizer, the input volume of the slices is greatly increased, and the crystallization time can be extended appropriately, which makes the crystallinity of the slices more uniform. The slices are transported to the top of the pre-reactor, where a roof-type reactor is installed on the top of the pre-reactor, that is, the original 4-stage pre-reactor is transformed into a 5-stage pre-reactor. When the slices pass through the uppermost ridge reactor, they will slide down from the gap of the ridge reactor and form a good and stable gradient. At this time, the slices push down a...

Embodiment 2

[0038] Embodiment 2: produce high uniformity low-viscosity chip (viscosity is at 0.96-0.98dl / g)

[0039] Low-viscosity slices with a viscosity of 0.67dl / g are sent to two pre-crystallizers from the polymer master chip silo. The temperature of the pre-crystallizers is controlled at 172-173°C, and the crystallization time is controlled at 15 minutes. Due to the addition of a crystallizer , the feeding amount of slices is greatly increased, and at the same time, the crystallization time can be extended appropriately to make the crystallinity of slices more uniform. The slices are transported to the top of the pre-reactor, where a roof-type reactor is installed on the top of the pre-reactor, that is, the original 3-stage pre-reactor is transformed into a 4-stage pre-reactor. When the slices pass through the uppermost ridge reactor, they will slide down from the gap of the ridge reactor and form a good and stable gradient. At this time, the slices push down and advance more evenly ...

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Abstract

The invention discloses a production process of a high-uniformity high-viscosity SSP polyester chip, belonging to the technical field of chemical fiber production and comprising the following steps of: (1) precrystallizing: respectively feeding polymerized and input chips the viscosity of about 0.67dl / g into two parallel precrystallizer from the upward side of the precrystallizers, and supplying hot air with the temperature of 177 DEG C from the downward side thereof, and then crystallizing for 12-15min and then outputting the chips from the crystallizers; (2) prereacting: feeding the chips output from the precrystallizers into a prereactor, wherein the upper part of the prereactor is additionally provided with a ridge-type reactor, and the viscosity of the chip output from the prereactorcan reach 0.82dl / g; and (3) final polycondensation reaction: the maximum viscosity value of the chips output from a polycondensation reactor can reach 1.09dl / g. The invention optimizes the traditional SSP process flow, i.e. controls a precrystallizing process, a prereacting process and a final polycondensation process, thereby effectively ensuring the successful preparation of the high-uniformityhigh-viscosity polyester chip.

Description

Technical field: [0001] The invention relates to a high-uniformity SSP high-viscosity polyester chip production process, which belongs to the technical field of chemical fiber production. Background technique: [0002] Solid state polycondensation (SSP for short) refers to the condensation reaction of reaction materials in a solid state. In the field of polyester industrial yarn production, in order to develop higher-grade HMLS products, automotive safety belt fibers, and differentiated and functional industrial yarn products, the viscosity uniformity, molecular weight distribution, and carboxyl-end uniformity of SSP polyester chips Higher requirements are put forward, especially in the case of high viscosity, the uniformity of slice viscosity is the most intuitive requirement. [0003] At present, domestic industrial yarn manufacturers adopt different SSP processes. Different manufacturers have different technological processes: SSP implementation methods include batch an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/80D01F6/62
Inventor 王祖宏张朔温国奇樊继明
Owner ZHEJIANG GUXIANDAO POLYESTER DOPE DYED YARN CO LTD
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