Preparation method of polyol copolyester

A technology of alcohol copolyester and polyol, which is applied in dyeing, textile and papermaking, etc., can solve the problem that polyester modified products cannot be produced quantitatively, and achieve the effect of reducing energy consumption

Inactive Publication Date: 2011-06-08
SHANGHAI DEFULUN CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] It is precisely because of these two major disadvantages that the polyester modified pro

Method used

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  • Preparation method of polyol copolyester
  • Preparation method of polyol copolyester
  • Preparation method of polyol copolyester

Examples

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preparation example Construction

[0035] The preparation method of polyol copolyester of the present invention, as image 3 As shown, the production process is as follows: slurry configuration of terephthalic acid and ethylene glycol, esterification I, esterification II, preshrinkage I, preshrinkage II, final shrinkage and pelletizing steps, and 1,3- The isophthalic acid-5-sodium sulfonate is subjected to the transesterification reaction step with another polyol, and after the dilution step, it enters the above-mentioned esterification II step.

[0036] The details are as follows:

[0037] (1) Slurry configuration

[0038] The mass ratio of purified terephthalic acid to ethylene glycol is: 1:0.36~1:0.42;

[0039] Liquid level control: 60-80%;

[0040] Temperature: 40~60℃;

[0041] Residence time: 3~5h.

[0042] (2) Esterification I

[0043] Reaction temperature: 261~265℃;

[0044] The reaction time is 3~4h; the pressure is 50~65Kpa;

[0045] Liquid level 50-65%;

[0046]The ethylene glycol is refluxed...

Embodiment 1

[0088] A new type of normal temperature and pressure copolyester chip is being improved in production, and its process flow is as follows image 3 shown. Wherein, another polyhydric alcohol of the fourth component is neopentyl glycol.

[0089] First, the third component 1,3-sodium isophthalic acid-5-sulfonate and the fourth component neopentyl glycol are subjected to transesterification in advance, and the reaction equation is as follows:

[0090]

[0091] After reaching a transesterification rate of about 85%, it is sent to esterification II

[0092] Implementation process:

[0093] The specific reaction control process is as follows:

[0094] (1) Slurry configuration

[0095] Add purified terephthalic acid and ethylene glycol at the same time, wherein purified terephthalic acid is 10,000 kg / hour, ethylene glycol is 3,800 kg / hour, the liquid level is controlled at 60-80%, the temperature is 40-60°C, and the residence time is 3-60%. 5h.

[0096] (2) Esterification I ...

Embodiment 2

[0164] In ECDP improvement production, its technological process is as follows image 3 shown. Wherein, another polyhydric alcohol of the fourth component is polyethylene glycol PEG-200.

[0165] First, the third component 1,3-sodium isophthalic acid-5-sulfonate is transesterified with the fourth component polyethylene glycol PEG-200, and the reaction equation is as follows:

[0166]

[0167] After reaching a transesterification rate of about 85%, it is sent to esterification II.

[0168] Implementation process:

[0169] The specific reaction control process is as follows:

[0170] (1) Slurry configuration

[0171] Add 10,000 kg / hour of purified terephthalic acid, 3,800 kg / hour of ethylene glycol, control the liquid level at 60-80%, temperature 40-60°C, and residence time 3-5 hours.

[0172] (2) Esterification I

[0173] The reaction temperature is 261-265° C., the reaction time is 3-4 hours, the pressure is 50-65 Kpa, the liquid level is 50-65%, and the reflux of eth...

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Abstract

The invention discloses a preparation method of polyol copolyester. The preparation method comprises the following steps of carrying out slurry preparation, esterifying I, esterifying II, pre-condensing I, pre-condensing II, final condensing and pelletizing on terephthalic acid and glycol. The preparation method also comprises: carrying out ester exchange reaction on 1,3-isophthalic acid-5-sodium sulfonate and another polyol; diluting with the glycol, and then performing the esterifying II. In the preparation method, 1,3-isophthalic acid-5-sodium sulfonate and another polyol react in advance, thereby increasing the reaction probability of another polyol and ensuring that another poyol can reach the required mole ratio in a finished product. The preparation method is mainly applied to production of dye modified polyester by using various dihydric alcohols at normal temperature and normal pressure. The modified polyester is dyed by mainly using anode pigment, the used dye chromatograph is more than that of common polyester, dye-uptake rate can reach above 99%, colour fastness reaches 4-5 grade of European standard, and the color is more flamboyance and beautiful. When filament yarns are subjected to spinning, full-package rate is up to 95%-100%.

Description

technical field [0001] The invention relates to a preparation method of polyester, in particular to a preparation method of polyol copolyester. Background technique [0002] my country's polyester fiber production ranks first in the world, and it is the textile fiber with the largest domestic production and consumption. Conventional polyester is formed by esterification and polycondensation of the first component of terephthalic acid (PTA) and the second component of ethylene glycol (EG). The basic production process is as follows: figure 1 As shown, including slurry configuration, esterification I, esterification II, preshrinkage I, preshrinkage II, final shrinkage and pelletizing. Among them, the slurry configuration refers to mixing terephthalic acid and ethylene glycol to form a slurry that meets the requirements of the esterification reaction. Esterification refers to the reaction of terephthalic acid and ethylene glycol under certain pressure and high temperature con...

Claims

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Application Information

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IPC IPC(8): C08G63/688C08G63/183C08G63/78D06P3/52
Inventor 谢宇江何正锋徐冬朱毅陈利兴方强褚新龙许海波王伟君
Owner SHANGHAI DEFULUN CHEM FIBER
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