Method for preparing water-soluble sulfo-copolyester

A sulfocopolyester, water-soluble technology, applied in the field of preparation of water-soluble sulfopolyester, can solve the problems of difficult recovery of ethylene glycol, increased cost, difficult control of side reactions, etc., and achieves a simple preparation process and reduced cost , the effect of good sizing effect

Inactive Publication Date: 2011-02-09
苏州瀚海化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned invention adopts secondary feeding, and the molar ratio of dihydric alcohol to dibasic acid is high, which leads to difficult control of side reactions, difficult recovery of ethylene glycol in the gas phase, and increased cost.

Method used

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  • Method for preparing water-soluble sulfo-copolyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Raw material dosage

[0036] Isophthalic acid 37.92kg (228.2mol)

[0037] Dimethyl isophthalate-5-sodium sulfonate 29.63kg (100mol)

[0038] Terephthalic acid 93.05kg (560.1mol)

[0039] Ethylene glycol 85.27kg (1373.7mol)

[0040] 1,6-Adipic acid 7.74kg (53.0mol)

[0041] The molar ratio of dibasic acid to diol is 1:1.45

[0042] After mixing 37.92kg of isophthalic acid, 29.63kg of dimethyl isophthalate-5-sodium sulfonate, 93.05kg of terephthalic acid, 85.27kg of ethylene glycol, and 7.74kg of 1,6-adipic acid, Put it into a 300L stainless steel reaction kettle, and add 90g of antimony trioxide, 120g of sodium acetate, 100g of tetrabutyl titanate, 40g of trimethyl phosphite, protect the reaction system with pure nitrogen gas, and keep the system pressure at atmospheric pressure. Stir at 65rpm and heat up to 200-250°C for esterification. When the esterification rate reaches or exceeds 95% and all the theoretical by-products are evaporated, stop the esterification, ...

Embodiment 2-6

[0046] Similar to the steps and conditions of Example 1, only the raw materials and proportioning are different.

Embodiment 2

[0048] Raw material dosage

[0049] Isophthalic acid 41.53kg (250.0mol)

[0050] Sodium isophthalic acid-5-sulfonate 33.52kg (124.9mol)

[0051] Terephthalic acid 80.57kg (484.9mol)

[0052] Ethylene glycol 85.27kg (1373.7mol)

[0053] 1,6-Adipic acid 7.74kg (53.0mol)

[0054] The molar ratio of dibasic acid to diol is 1:1.50

[0055] Catalyst: 90g antimony acetate, 120g sodium acetate, 30g phosphoric acid

[0056] The properties of the obtained polyester are shown in Table (1).

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Abstract

The invention discloses a method for preparing water-soluble sulfo-copolyester used in textile slurry. The method comprises the following steps of: performing esterification reaction or transesterification on dibasic acid / ester at least containing isophthalic acid, sulfo-dibasic acid or ester and terephthalic acid and dibasic alcohol at least containing ethanediol to obtain polycondensation prepolymer; and performing polycondensation under reduced pressure to obtain a product, wherein the molar ratio of the dibasic acid to the dibasic alcohol is 1:1.3-1:1.8; the materials are put at one time; and the polycondensation prepolymer is obtained in one step. The method has the advantages of not using expensive polyethylene glycol materials, adopting a lower molar ratio of the dibasic acid to the dibasic alcohol, putting the materials at one time, reducing cost, along with simple process. The product has high water solubility and higher glass-transition temperature, is suitable for storage, and has good effect in slurry.

Description

technical field [0001] The invention relates to the field of preparation of water-soluble polyester, in particular to a preparation method of water-soluble sulfopolyester used in textile pulp. Background technique [0002] At present, in the textile industry, it has become a hot spot to study water-soluble polyester to replace polyvinyl alcohol (PVA), which is not easily degraded and causes great environmental pollution, for textile sizing. [0003] The existing method for preparing water-soluble polyester usually adopts terephthalic acid or ester, ethylene glycol as the main part, supplemented by difunctional sulfomonomer (such as isophthalic acid-5-sulfonate) and poly Prepared from ethylene glycol (PEG) or other multifunctional monomers. [0004] It is known in the art that sulfomonomers and polyethylene glycols can be used to increase the water solubility of polyesters. Due to the high price of PEG raw materials, and when used too much, it is easy to produce "hygroscopi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/688C08G63/78D06M15/507
Inventor 金旭华道本许峰黄志远
Owner 苏州瀚海化学有限公司
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