Method for preparing regenerative low-melting-point polyester with waste-polyester alcoholysis method

A low-melting point polyester and waste polyester technology, applied in the direction of single-component polyester rayon, rayon manufacturing, fiber chemical characteristics, etc., can solve the problem of large fluctuations in the content of by-product diethylene glycol and the hue of recycled polyester Variation, melting point is not easy to control and other problems, to achieve the effect of stabilizing the quality of alcoholysis products, reducing by-products, and realizing high-value recycling

Active Publication Date: 2018-02-02
ZHEJIANG SCI-TECH UNIV
View PDF8 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the above methods of obtaining ethylene terephthalate or oligomers through alcoholysis of ethylene glycol, and then performing polycondensation, due to the uncertainty of the source of raw materials

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing regenerative low-melting-point polyester with waste-polyester alcoholysis method
  • Method for preparing regenerative low-melting-point polyester with waste-polyester alcoholysis method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] Example 1

[0017] The method for preparing recycled low melting point polyester by alcoholysis of waste polyester in this embodiment, such as figure 1 As shown, it includes the following steps: 1) The pretreatment of waste polyester, the clean waste polyester block is directly broken into the silo, the clean waste polyester fiber is cut and sent to the silo, and the waste polyester bottle flakes are processed After sorting, cleaning, cleaning, crushing and cutting, it is sent to the silo, and then mixed with ingredients for the next process; 2) alcoholysis of waste polyester, the pretreated waste polyester is treated as waste polyester (waste polyester). Polyester addition port 7) and ethylene glycol (added in ethylene glycol addition port 6) in a ratio of 1:2 in mole percentage, put into alcoholysis tank 1, alcoholysis tank 1 contains ethylene terephthalate And oligomer (mother liquor) (added in the first additive addition port 8), where the added amount of ethylene ter...

Example Embodiment

[0019] Example 2

[0020] As described in Example 1, the difference is: the mole percentage of waste polyester and ethylene glycol is 1:4, and the alcoholysis kettle contains ethylene terephthalate and oligomer (mother liquor). The added amount of ethylene glycol diformate and oligomer (mother liquor) accounts for 30% of the total mass percentage of the waste polyester input, the reaction temperature is 200° C., and the reaction time is 4 hours. Add 0.2‰ (mass percentage of the obtained product) phosphorous acid stabilizer; esterification reaction temperature 230 ℃, reaction time 1.5 hours, while adding 40% (mass percentage of the obtained product) 1,4 cyclohexane dimethanol, 0.4 % (Accounting for the mass percentage of the obtained product) of DEG, so that the DEG content in the esterified product (accounting for the mass percentage of the obtained product) is 2.4%. Control the temperature of polycondensation-I and polycondensation-II to 250 and 260°C, respectively, and the int...

Example Embodiment

[0022] Example 3

[0023] As described in Example 1, the difference is: the mole percentage of waste polyester and ethylene glycol is 1:6, and the alcoholysis kettle contains ethylene terephthalate and oligomer (mother liquor). The added amount of ethylene glycol diformate and oligomer (mother liquor) accounts for 20% of the total mass percentage of the waste polyester input, the reaction temperature is 190°C, and the reaction time is 2 hours. Add 0.2‰ (mass percentage of the obtained product) of trimethyl phosphate stabilizer; esterification reaction temperature 220 ℃, reaction time 1 hour, while adding 50% (mass percentage of the obtained product) neopentyl glycol, 0.2% ( The DEG (accounting for the mass percentage of the obtained product) makes the DEG content in the esterified product (accounting for the mass percentage of the obtained product) 2.4%. Control the temperature of polycondensation-I and polycondensation-II to 245 and 255°C, respectively, and the intrinsic viscos...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Intrinsic viscosityaaaaaaaaaa
Melting pointaaaaaaaaaa
Intrinsic viscosityaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for preparing regenerative low-melting-point polyester with a waste-polyester alcoholysis method. The method includes the steps of 1), pretreatment of waste polyester;2), alcoholysis of the waste polyester; 3), quality regulation of esters and adding of one or multiple copolymers of isophthalic acid, 1-4 cyclohexane dimethyl alcohol and neopentyl glycol; 4), polycondensation and slicing preparation, wherein the low-melting-point polyester finally obtained is 0.60-0.70dl/g in intrinsic viscosity, 100-180DEG C in melting point, 3.0+/-0.3% in content of diglycoland smaller than 6 in chroma value of b. The obtained regenerative low-melting-point polyester is applicable to preparation of cationic-ion dyeable poester filaments and short fiber, and high-value recycling of the waste polyester is realized.

Description

technical field [0001] The invention relates to a method for preparing recycled low-melting point polyester by alcoholysis of waste polyester, belonging to the field of waste polyester recycling. Background technique [0002] Polyethylene terephthalate (PET, polyester for short), as an important raw material, is widely used in the production of beverage bottles, fibers, films, sheets, etc. With the rapid development of the polyester industry, the polyester waste produced during the production of polyester and the processing and use of its products is also increasing rapidly. Due to the strong chemical inertness of polyester, it is difficult to degrade or be decomposed by microorganisms in natural storage, which not only causes a huge waste of resources, but also produces serious environmental pollution. Therefore, realizing a virtuous cycle of resources and improving environmental quality through recycling has become an important issue in the current polyester industry. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C08G63/83C08G63/183C08J11/24D01F6/92D01F1/10
CPCC08G63/183C08G63/83C08J11/24D01F1/10D01F6/92Y02W30/62
Inventor 王秀华胡园超张须臻
Owner ZHEJIANG SCI-TECH UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap