Method for preparing high-quality melt through alcoholysis of waste polyester textile with ethylene glycol

A technology of waste polyester and ethylene glycol, which is used in the preparation of spinning solutions, textiles and papermaking, single-component polyester rayon, etc., can solve the problems of product quality impact, increased production cost, and limited viscosity increase. , to solve the easy blockage of the pipeline, improve the flow performance, and prolong the service life.

Inactive Publication Date: 2017-01-04
NINGBO DAFA CHEM FIBER
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AI Technical Summary

Problems solved by technology

However, in view of the complex sources of waste polyester textiles, the uneven quality of processed foam materials and the limited level of existing production technology, there are still great difficulties in large-scale application or high-value utilization.
Mainly reflected in the high content of impurities in foam materials processed by waste polyester textiles, the high content of organic pigments that are easy to degrade, the incomplete sorting and the confusion of natural fibers and other waste polyester fibers, etc.
In the process of fiber production using liquid-phase viscosification technology, low polymers such as cyclone filters, dust filters, vacuum pipes, and tube heat exchangers are easy to solidify due to volatilization of plasticizers, sizing materials, dyes, and other low molecules. problems, resulting in increased vacuum system maintenance and increased production costs
In addition, due to the relatively low viscosity of the final melt, the quality of the product is affected to a certain extent, and the differentiation of products and the development of high value-added products are also limited
[0003] At present, the viscosity of the existing waste polyester textiles is mainly increased through the liquid phase. However, due to the complexity of the sources of the waste polyester textiles, the viscosity of the polyester increases after the liquid phase conditioning and tempering, but the viscosity increase range is relatively limited. The most critical thing is that the molecular weight distribution is relatively wide. The main reason is that the number of carboxyl and hydroxyl functional groups opened in the melted polyester melt is limited, which limits the pressure under certain vacuum conditions (≤500Pa) and within a certain time (25min~65min) ) polycondensation reaction in the segment

Method used

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  • Method for preparing high-quality melt through alcoholysis of waste polyester textile with ethylene glycol

Examples

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Effect test

Embodiment 1

[0028] After compounding the foam material according to the impurity content, color, viscosity difference, etc., it is rotated and dried for 9 hours under a certain vacuum (≤-0.96MPa) and temperature (145°C±5°C), and finally 90PPm of water is put into the spinning silo. Adjust the speed of the ethylene glycol pump so that the mass fraction of ethylene glycol measured is 4% of the foam material, the feed rate of the screw is 1t / h, and the temperature from the first to the tenth zone of the screw is 280°C, 285°C, and 295°C in sequence , 295°C, 295°C, 290°C, 290°C, 285°C, 285°C, 285°C, the filter temperature is 285°C, and the residence time of the melt in the screw, filter and pipeline is 16min. It takes 75 minutes to enter the liquid-phase tempering and viscosity-adjusting device. The vacuum degree of the vertical kettle and the horizontal kettle are 200Pa~185Pa and 100Pa~60Pa respectively, and the temperature of the kettle is 285°C. Continuously run for 48 hours in the case of ...

Embodiment 2

[0032]After compounding the foam material according to the impurity content, color, viscosity difference, etc., it is rotated and dried for 8.5 hours under a certain vacuum (≤-0.96MPa) and temperature (145°C±5°C), and 105PPm is put into the spinning silo. Adjust the speed of the ethylene glycol pump so that the mass fraction of ethylene glycol measured is 5% of the foam material, the feed rate of the screw is 0.8t / h, and the temperature from the first to the tenth area of ​​the screw is 280°C, 285°C, and 295°C. ℃, 295℃, 295℃, 290℃, 290℃, 285℃, 280℃, 280℃, the filter temperature is 285℃, and the residence time of the melt in the screw, filter and pipeline is 20min. It takes 90 minutes to enter the liquid-phase tempering and viscosity-adjusting device. The vacuum degree of the vertical kettle and the horizontal kettle are 200Pa~185Pa and 100Pa~60Pa respectively, and the temperature of the kettle is 280°C. Continuously run for 48 hours under the condition of similar raw materials...

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Abstract

The invention relates to a waste polyester high-value circulation reuse technique, and in particular to a method for preparing a high-quality melt through alcoholysis of a waste polyester textile with ethylene glycol. The method for preparing the high-quality melt through alcoholysis of the waste polyester textile with ethylene glycol comprises the following steps: adding ethylene glycol which accounts for 1-8% of the mass of a raw material into a screw extruder for mixing melt extrusion, and feeding the material into a hardening and tempering device, wherein the melt viscosity of the melt extruded from the screw extruder is 0.40-0.50dl / g; the melt viscosity of the melt discharged from the hardening and tempering device is 0.620-0.685dl / g. Due to adoption of a proper amount of the ethylene glycol, the melt viscosity can be improved, meanwhile, the problems that a filter is short in cycle and a vacuum system is large in maintenance workload can be effectively solved, the production cost can be lowered, and meanwhile, the additional value of a product can be increased.

Description

technical field [0001] The invention relates to a high-value recycling technology of waste polyester, in particular to a method for preparing a high-quality melt from ethylene glycol alcoholysis waste polyester textiles. Background technique [0002] China is currently the world's largest textile production and consumption market. In 2015, China's total textile processing exceeded 50 million tons, and waste textiles generated exceeded 20 million tons, of which waste polyester textiles accounted for as much as 70%. The accumulated stock of the year, only the stock of waste polyester textiles is as high as more than 200 million tons. However, in view of the complex sources of waste polyester textiles, the uneven quality of processed foam materials and the limited level of existing production technology, there are still great difficulties in large-scale application or high-value utilization. It is mainly reflected in the high impurity content of foam materials processed by was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/24C08G63/78D01F6/62D01D1/02D01D13/02C08L67/00
CPCC08G63/78C08J11/24C08J2367/00D01D1/02D01D13/02D01F6/62Y02W30/62
Inventor 邢喜全钱军王方河杜国强顾军
Owner NINGBO DAFA CHEM FIBER
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