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Method for preparing mercapto polyether

A technology of mercapto polyether and chlorinated polyether, which is applied in the field of preparation of mercapto-terminated polyether, can solve the problems of poor dispersion of sodium hydrosulfide and low utilization rate of sodium hydrosulfide, etc., to reduce energy consumption, improve utilization rate, and react The effect of temperature reduction

Inactive Publication Date: 2008-09-03
BEIJING UNIV OF CHEM TECH
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AI Technical Summary

Benefits of technology

By replacing certain chemicals with different types of molecules called chloro-polyoxy ethylene (CPE) or hydrogen sulfite instead of chloraurythane for making alkali metal detergents, this new method improves their performance compared to traditional methods by increasing its effectiveness at lower temperatures while maintaining good results on cleanliness properties such as soil removal efficiency.

Problems solved by technology

Technically speaking, there exist technical problem addressed by these inventions relates to improving the properties of certain types of materials called sulfides polymers, particularly those found in rubber products like automobile parts and paints. These polymers may lose their effectiveness over time because they break down easily during storage/usage processes. To solve this issue, researches were conducted exploring various methods involving modifying them chemistry without losing functionality themselves. However, previous attempts resulted in slow solidification times and reduced efficiency.

Method used

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  • Method for preparing mercapto polyether
  • Method for preparing mercapto polyether
  • Method for preparing mercapto polyether

Examples

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Embodiment 1

[0023] Preparation of mercapto-terminated polyether:

[0024] Raw materials: chlorinated polyether, the number-average molecular mass Mn=1277, and a functionality of 3; sodium hydrosulfide, with a purity of 70%; ethanol as the solvent.

[0025] Add 250g of chlorinated polyether and 46.99g of sodium hydrosulfide into 200ml of ethanol solvent, heat up to 78°C under stirring, and stop the reaction after reacting at this temperature for 2 hours, remove the salt from the reactant, and distill to obtain a transparent, light yellow liquid Polymer terminated mercapto polyether.

[0026] The synthetic product is liquid at room temperature, and it is 13 C NMR characterization, compared with the NMR spectrum of chlorinated polyether, the characteristic peak at 44.0-45.0ppm disappeared, indicating that the C-CI group was reacted; new characteristic peaks appeared at 25.5ppm and 35.2ppm, indicating that There are C-SH and C-Sx-C (X is 1-5) groups generated. The GPC characterization of t...

Embodiment 2

[0029] Preparation of mercapto-terminated polyether:

[0030] Raw materials: chlorinated polyether, the number-average molecular mass Mn=1277, and a functionality of 3; sodium hydrosulfide, with a purity of 70%; and isopropanol as the solvent.

[0031] Add 250g of chlorinated polyether and 46.99g of sodium hydrosulfide into 250ml of isopropanol solvent, raise the temperature to 82°C under stirring, and stop the reaction after reacting at this temperature for 3 hours, desalinate the reactant, and distill to obtain transparent, shallow Yellow liquid polymer mercapto-terminated polyether.

[0032] The synthetic product is liquid at room temperature, and it is 13 C NMR characterization, compared with the NMR spectrum of chlorinated polyether, the characteristic peak at 44.0-45.0ppm disappeared, indicating that the C-CI group was reacted; new characteristic peaks appeared at 25.5ppm and 35.2ppm, indicating that There are C-SH and C-Sx-C (X is 1-5) groups generated. The GPC chara...

Embodiment 3

[0035] Preparation of mercapto-terminated polyether:

[0036] Raw materials: chlorinated polyether, number average relative molecular mass Mn=1277, functionality 3; sodium hydrosulfide, purity 70%; tert-butanol as solvent.

[0037] Add 250g of chlorinated polyether and 46.99g of sodium hydrosulfide into 300ml of tert-butanol solvent, raise the temperature to 82°C under stirring, and stop the reaction after reacting at this temperature for 3.5 hours, desalt the reactant, and distill it to obtain transparent, shallow Yellow liquid polymer mercapto-terminated polyether.

[0038] The synthetic product is liquid at room temperature, and it is 13 C NMR characterization, compared with the NMR spectrum of chlorinated polyether, the characteristic peak at 44.0-45.0ppm disappeared, indicating that the C-CI group was reacted; new characteristic peaks appeared at 25.5ppm and 35.2ppm, indicating that There are C-SH and C-Sx-C (X is 1-5) groups generated. The GPC characterization of the ...

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Abstract

The invention relates to a preparation method of end-mercapto polyether, belonging to adhesive field. The deficits of the present preparation method of end-mercapto polyether: the solubleness of product obtained by reacting polyalkylene diol and epoxy halopropane in sodium hydrosulphide is poor and the availability of sodium hydrosulphide is reduced, therefore the difficulty is added to the post-treatment. The chloride polyether, sodium hydrosulphide and alcohol material are mixed together and react for 2-5 hours at boiling point of alcohol material to 40 degree, wherein the quantity relative ratio of alcohol material and sodium hydrosulphide is 3-18:1, the quantity relative ratio of chloride polyether and sodium hydrosulphide is 1:2-3.5. The availability of the sodium hydrosulphide is greatly increased. In addition, the displacement reaction of chloride polyether and sodium hydrosulphide occurs in alcohol material, the reaction temperature is reduced, so as to reduce the energy consumption.

Description

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Claims

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Application Information

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Owner BEIJING UNIV OF CHEM TECH
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