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Method for producing low-melting-point renewable polyester for sheath-core polyester through glycol degradation

A technology of recycled polyester with low melting point, applied in filament/thread forming, conjugated synthetic polymer artificial filament, textile and papermaking, etc., which can solve problems such as poor stability, reduced production cost, and poor spinnability of fibers, Achieve stable quality, increase added value, and excellent quality

Active Publication Date: 2013-06-12
余姚大发化纤有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, this technology replaces low-melting polyester chip spinning with melt direct spinning, which better solves a series of problems such as high drying cost, poor stability, and poor fiber spinnability of low-melting polyester, and the production cost is greatly reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Preparation of recycled low-melting point polyester: the mass ratio of recycled raw materials to methanol is 1:6; the mass ratio of recycled raw materials to zinc acetate is 100:0.5; the above raw materials are polymerized after methanolysis to prepare recycled low-melting point polyester : The degradation temperature is 190°C, the pressure is 2.5Mpa, and the reaction time is 3h. When the pressure returns to atmospheric pressure, the reaction is completed. The reactant is filtered, the obtained liquid is rotary evaporated, methanol and ethylene glycol are evaporated separately, and the obtained solid Dissolve in hot ethanol and filter, and distill off the ethanol from the resulting liquid to obtain dimethyl terephthalate (DMT). The molar ratio of dimethyl terephthalate (DMT) to isophthalic acid (IPA) is 3:1; the molar ratio of dimethyl terephthalate (DMT) to neopentyl glycol (NPG) is 7:1; 1:2 molar ratio of dimethyl terephthalate (DMT) to ethylene glycol; 1.5:1 molar...

Embodiment 2

[0033]1. Preparation of recycled low melting point polyester: The mass ratio of recycled raw materials to water is 1:4; the mass ratio of recycled raw materials to potassium acetate is 100:0.5; the above raw materials are hydrolyzed and polymerized to prepare recycled low melting point polyester: hydrolysis The temperature is 220°C, the pressure is 4.5Mpa, and the reaction time is 2.8h. When the reaction is completed and the pressure returns to atmospheric pressure, the reactant is filtered, and the obtained liquid is rotary evaporated to obtain ethylene glycol, and then the filtered solid is dissolved in DMF and filtered. The resulting liquid is recrystallized to give terephthalic acid (TPA). The molar ratio of terephthalic acid (TPA) to adipic acid (AA) is 3.5:1; the molar ratio of terephthalic acid (TPA) to hexanediol (HG) is 6:1; terephthalic acid The molar ratio of (TPA) to ethylene glycol is 1.5:1; the molar ratio of alkyd is 1.5:1; the catalyst antimony trioxide (Sb203)...

Embodiment 3

[0041] 1. Preparation of recycled low-melting polyester: the mass ratio of recycled raw materials to ethylene glycol is 1:3.5; the mass ratio of recycled raw materials to butanediyltin laurate is 100:0.5; the alcoholysis reaction temperature is 196°C, The pressure is 0.15MPa, the reaction time is 2h, and the intrinsic viscosity of the reaction liquid reaches 0.29dl / g. After the reaction is finished, quickly heat the reaction liquid and filter it, carry out vacuum distillation on the filtrate to recover ethylene glycol, and dissolve the liquid (solid at normal temperature) after vacuum distillation in solvents such as hot alcohol, ester, chlorinated hydrocarbon, ketone, etc. , heat filtered to remove insoluble matter, and the filtrate was naturally cooled to obtain ethylene terephthalate (BHET) and its oligomers. Add isophthalic acid (IPA), neopentyl glycol (NPG), catalyst antimony trioxide (Sb203) and cobalt acetate (Co(Ac) to ethylene terephthalate (BHET) and its oligomers. ...

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Abstract

The invention relates to a method for producing low-melting-point renewable polyester for sheath-core polyester. The low-melting-point renewable polyester is prepared from the following raw materials through degradation and polycondensation: (a) renewable raw materials; (b) glycol; (c) one or more of zinc acetate, potassium acetate, manganese acetate, magnesium acetate, lead acetate, cobalt chloride, tetrabutyl titanate, tetraisopropyl titanate and dibutyltin dilaurate; (d) one or more of m-phthalic acid, adipic acid and sebacic acid; (e) one or more of neopentyl glycol, hexanediol, butanediol and polyethylene glycol; (f) catalysts, namely antimony trioxide and cobalt acetate; and (g) a stabilizer, namely trimethyl phosphate. The low-melting-point renewable polyester produced by the method can be applied to the preparation of sheath-core polyester staple fibers, so that the added value of polyester wastes in preparation of renewable polyester staple fibers is increased, and the prepared sheath-core renewable polyester staple fibers have the characteristics of stable quality and excellent quality. The method can be applied to the production of industries, such as non-woven fabrics, flocking and composite materials.

Description

technical field [0001] The invention relates to the technical field of chemical fiber production, in particular to a method for preparing regenerated polyester with a low melting point for sheath-core polyester. Background technique [0002] Low-melting point sheath-core composite polyester staple fiber refers to the fiber made of two different polymers, low-melting point polyester and conventional polyester, which are distributed in the same fiber in a sheath-core structure. The cortex is a low-melting polyester, which retains some of the properties of conventional polyesters and has good compatibility with conventional polyesters. The low-melting point skin-core composite fiber is mainly used for thermal bonding fibers. The main function in the production of nonwovens is to melt the low-melting point fiber skin layer polymer at a certain temperature, thereby playing a bonding effect in the fiber web. Due to the low-melting point polyester staple fiber has high strength, g...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/181C08G63/672C08J11/24D01F8/14D01D5/34
CPCC08G63/672C08G63/181D01F8/14D01D5/34C08G63/183C08J11/24C08G63/78
Inventor 钱军王方河唐世君邢喜全秦丹马哲峰杜芳王秀华
Owner 余姚大发化纤有限公司
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