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A method for increasing the viscosity of polyester bottle flakes

A technology of polyester bottle flakes and bottle flakes, which is applied in the field of polyester industrial filaments, can solve the problems of high cost, oil resource consumption, and many processes, and achieve the effects of high work efficiency, balanced spinning efficiency, and balanced spinning quality

Inactive Publication Date: 2015-09-02
盐城市华普轻纺机械有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that there are many processes, high cost, and a large consumption of oil resources

Method used

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Embodiment Construction

[0023] Below through specific embodiment, further describe the present invention.

[0024] A method for increasing the viscosity of polyester bottle flakes, comprising the following steps: dry crystallization, pre-extrusion, pre-filtration, homogenization, fine extrusion, fine filtration, vertical polycondensation and horizontal polycondensation;

[0025] (1) Dry crystallization: crush the polyester bottle into flake flakes, wash them and send them to the flake silo with a spiral agitator, and carry out dry crystallization under the action of the hot air in the flake silo. The temperature is 165-175°C, and the time is 3-3.5 hours;

[0026] (2) Pre-extrusion: The bottle flakes after drying and crystallization in step 1 are forced into the large-thread screw extruder through the screw agitator of the bottle flake silo, and melted and extruded, the extrusion temperature is 200-250 ℃; the bottle flake silo with forced feeding device is adopted to prevent the clogging of the feedi...

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Abstract

The invention discloses a method for increasing the viscosity of polyester bottle flakes. The method includes stirring phenol / tetrachloroethane mixed liquor with the concentration of 0.010g / ml (a weight ratio of 3:2) and enabling the phenol / tetrachloroethane mixed liquor to react under the conditions that the vacuum degree ranges from 40Pa to 71Pa and the temperature ranges from 200 DEG C to 250 DEG C by means of vertical condensation polymerization so as to obtain melts with an increased viscosity value of 0.820+ / -0.001dl / g; stirring phenol / tetrachloroethane mixed liquor with the concentration of 0.010g / ml (a weight ratio of 5:3) and enabling the phenol / tetrachloroethane mixed liquor to react under the conditions that the vacuum degree ranges from 20Pa to 40Pa and the temperature ranges from 279 DEG C to 280 DEG C by means of horizontal condensation polymerization so as to obtain melts with an increased viscosity value of 0.900+ / -0.001dl / g on the basis of the melts obtained in the previous step. The method has the advantages that condensation polymerization is carried out on polyester bottle flake solution twice, so that the viscosity of the polyester bottle flakes can be increased and reaches 0.900+ / -0.001dl / g, high requirements on the viscosity of industrial yarns can be met, and the spinning quality and the spinning efficiency can be balanced by the aid of the method; switchable dual rough filter devices and switchable dual fine filter devices are implemented in the method, a working procedure is continuous, and accordingly the work efficiency is high.

Description

technical field [0001] The invention provides a method for increasing the viscosity of polyester bottle flakes, which mainly relates to the large-scale production of polyester industrial filaments by recycling polyester bottle flakes. Background technique [0002] The traditional method of producing polyester industrial filaments uses virgin polyester chips as raw material. The raw material is characterized by high purity, stable viscosity and low water content. Due to the high strength of industrial yarn, the strength is generally 7.00-8.20cN / dtex, so the viscosity of the melt is required to be higher than that of the polyester fiber for textile production, which should be 0.82-0.910±0.001dl / g, while the viscosity of virgin polyester chips is generally 0.6dl / g, so it is necessary to increase the viscosity of the raw polyester chips to increase the molecular weight of the polyester, that is, to carry out the polycondensation reaction. Since it is a solid-phase polycondensat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D1/04D01D1/10D01D1/06C08G63/78D01F6/62
Inventor 严加军钱玉
Owner 盐城市华普轻纺机械有限公司
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