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 problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] 1. Preparation of recycled low-melting 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 to produce recycled low-melting polyester after methanolysis :The degradation temperature is 190℃, the pressure is 2.5Mpa, the reaction time is 3h, the reaction is over when the pressure returns to atmospheric pressure, the reactants are filtered, the liquid obtained is rotary evaporated, and the methanol and ethylene glycol are respectively evaporated to obtain solids It is dissolved in hot ethanol and filtered, and the obtained liquid is evaporated to remove ethanol 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; the molar ratio of dimethyl terephthalate (DMT) to ethylene glycol is ...

Example Embodiment

[0032] Example 2

[0033] 1. Preparation of recycled low-melting 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 polymerized to prepare recycled low-melting polyester through hydrolysis: hydrolysis The temperature is 220°C, the pressure is 4.5Mpa, and the reaction time is 2.8h. When the pressure returns to atmospheric pressure at the end of the reaction, the reactants are filtered, the resulting liquid is rotary evaporated to obtain ethylene glycol, and the filtered solids are dissolved in DMF and filtered. The obtained liquid is recrystallized to obtain 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 acid is 1.5:1; the catalyst antimony trioxi...

Example Embodiment

[0040] Example 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 butadiyl tin 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 over, the reaction liquid is quickly hot filtered, and the filtrate is subjected to vacuum distillation to recover ethylene glycol. The liquid after vacuum distillation (solid at room temperature) is dissolved in hot alcohol, ester, chlorinated hydrocarbon, ketone and other solvents , Heat filtered to remove insolubles, and the filtrate is naturally cooled to obtain BHET and its oligomers. Add isophthalic acid (IPA), neopentyl glycol (NPG), antimony trioxide (Sb203) and cobalt acetate (Co(Ac) to the ethylene terephthalate (BHET) and its oligomers ) 2) Conduct polycondensat...

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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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