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Basic aqueous easily-soluble modified polyesters and preparation method

A modified polyester and copolymer technology, which is applied in the field of modified polyester and its preparation, can solve the problems of poor color, high grayness, and poor spinnability of polyester chips, achieve sufficient alkali water solubility, and improve polymerization The effect of material quality and excellent heat resistance

Inactive Publication Date: 2008-06-18
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can be used to produce alkali-soluble polyester in a continuous process, the high viscosity and low solubility of the product determine that the product has defects in filament formation, coloring, and alkali-soluble speed. This method also adds a fourth group Separation of polyalkylene glycol, which will deteriorate the heat resistance and air oxidation resistance of the polymer, and at the same time have a negative impact on the control of product costs and the operability of process conditions
The catalyst used in this method is antimony trioxide. Since antimony trioxide contains impurities such as zero-valent antimony, the polyester chips have poor color, high grayness, many aggregated particles, and poor spinnability. At the same time, antimony catalysts are also harmful to the environment. Today, with increasing emphasis on environmental protection requirements, the use of non-toxic and environmentally friendly catalysts is the trend of product development

Method used

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  • Basic aqueous easily-soluble modified polyesters and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 100 grams of dimethyl terephthalate and 72 grams of ethylene glycol (molar ratio 1: 1.92) are dropped into the transesterification tank reactor, and 8 mol % (that is, equivalent to 1% in the modified polyester obtained) SIPM (product of Jiangsu Qunfa Co., Ltd.), whose content is 8 mol% in all acid components), 150ppm transesterification catalyst cobalt acetate, under nitrogen atmosphere, heat up to 160~250 DEG C (can be 160 DEG C, 200 DEG C, 200 DEG C, 250°C) for esterification. After the esterification reaction was completed, the esterified product was sent to the polycondensation kettle, and then adding phosphoric acid (PA), 5000ppm lithium acetate (LAH) and titanium compound catalyst A1 with a content of 5 ppm of phosphorus element, phosphoric acid, lithium acetate and titanium compound are both ethylene glycol solutions, and then the temperature is raised from 255°C to 280°C in 1 hour, the pressure is dropped from normal pressure to below 200Pa, and kept in this sta...

Embodiment 4

[0035] Put 100 grams of terephthalic acid and 45 grams of ethylene glycol (molar ratio 1:1.2) into an esterification tank reactor, and carry out esterification reaction at 250° C. After the esterification reaction was completed, the esterified product was sent into the polycondensation kettle, and SIPE (product of Jiangsu Qunfa Co. ), phosphorus element content is 27ppm phosphoric acid, 5000ppm lithium acetate and titanium element content is the titanium compound catalyst A1 of 5ppm, and phosphoric acid, lithium acetate and titanium compound are all ethylene glycol solutions. Then use 1 hour to increase the temperature from 255°C to 280°C, and drop the pressure from normal pressure to below 200Pa, and keep it in this state, and carry out the polymerization reaction for 1 to 3 hours to obtain the modified polyester in Table 1. copolymer. The viscosity of the polymer is 0.53, the content of diethylene glycol is 1.46wt%, the content of terminal carboxyl groups is 22.5 mol / t, and...

Embodiment 7

[0060] A method for preparing modified polyester easily soluble in alkaline water, including esterification and polymerization, in which dimethyl terephthalate, terephthalic acid, and ethylene glycol are used as the first and second components, and metal-containing Sulfonate-based isophthalic acid is the third component; titanate is used as a catalyst, a phosphorus compound is used as a stabilizer, and an alkali metal compound is used as an additive.

[0061] The general chemical formula of isophthalic acid containing metal sulfonate groups is shown below:

[0062] Formula 1)

[0063] where R 1 and R 2 Hydrogen (or methyl or hydroxyethyl), respectively, M is lithium metal (or sodium or potassium).

[0064] The content of the isophthalic acid component containing sulfonate group in the total acid is 2.0-15.0 mole % (that is, the content equivalent to the content of 2.0-15.0 mole % in the total acid component in the prepared modified polyester) ( Example 2.0%, 9%, 15%).

...

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Abstract

The present invention discloses alkali soluble modified polyester and the preparation method. The production method includes esterification and condensation reactions and is characterized in that in the reaction, terephthalic acid dimethyl ester or terephthalic acid and ethylene alcohol are first component and second component, and m-phthalic acid ester with metallic sulphonate respectively is thirdcomponent; metatitanic acid ester is catalyst, phosphorus compound is stabilizer and alkali metal compound is assistant additive. The polyester copolymer provided by the present invention is characterized in that the viscosity is 0.40 to 0.65dl / g (including 0.40dl / g, 0.55dl / g, 0.65dl / g); wherein, the content of stibium compound is less than or equal to 100ppm in the unit of stibium atom relatively to polyester. The polyester copolymer produced by the present invention has excellent heat resistance, full alkali solubility and good spinning performance.

Description

technical field [0001] The invention relates to a modified polyester and a preparation method thereof. Background technique [0002] Microfiber is the leader in the development and popularity of polyester filaments in recent years, and has been developed rapidly because of its unique softness, drapability, and air permeability. Sea-island fiber is a kind of composite fiber. After post-processing and finishing, the composite fiber can be one of the thinnest commercialized fibers in the world today. It is ideal for producing high-grade clothing fabrics, high-grade decorative cloths, and high-grade wiping materials. raw material. The island-in-the-sea composite fiber uses polymers with different solubility properties to be spun at the same time as spinning raw materials, in which the easily soluble polymer is used as the "sea" component, and the other component is used as the "island" component. The cross-section of the obtained fiber is a sea-island structure in which the sk...

Claims

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Application Information

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IPC IPC(8): C08G63/688C08G63/40
Inventor 陈顺国曹晓秀本田圭介
Owner TORAY FIBER RES INST(CHINA) CO LTD
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