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Selenium-coordinated dimercaptothiadiazole as well as preparation method and application thereof

A dimercaptothiadiazole and coordination technology, applied in the field of rubber vulcanization aids, can solve the problems of high toxicity, sensitization, and irritation of accelerator M, and achieve excellent vulcanization acceleration effect, short reaction time, The effect of high synthetic yield

Inactive Publication Date: 2020-12-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both accelerator M and accelerator DM have the advantages of high vulcanization activity and good vulcanization flatness, and can endow vulcanized rubber with good aging resistance and fatigue resistance. However, accelerator M is highly toxic and easily produces carcinogenic nitrosamines. It belongs to 2A carcinogens, and the accelerator DM is more irritating and sensitizing, and is also prone to carcinogenic nitrosamines, so the application of these two accelerators is subject to certain restrictions

Method used

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  • Selenium-coordinated dimercaptothiadiazole as well as preparation method and application thereof
  • Selenium-coordinated dimercaptothiadiazole as well as preparation method and application thereof
  • Selenium-coordinated dimercaptothiadiazole as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of selenium coordination dimercaptothiadiazole, its preparation method comprises the following steps:

[0044] 1) Add 3.093g (0.02mol) of dimercaptothiadiazole to 100mL of ethylene glycol, control the speed of the stirrer to 400rpm, and stir at 40°C for 20min to obtain a dimercaptothiadiazole solution;

[0045] 2) Add 2.175g (0.02mol) of selenium dioxide into 50mL of absolute ethanol, control the rotation speed of the stirrer to 400rpm, and stir at 40°C for 20min to obtain a selenium dioxide solution;

[0046] 3) Slowly add the selenium dioxide solution dropwise to the dimercaptothiadiazole solution, react at 40°C for 1.5h after the dropwise addition, filter, dry, pulverize and sieve the solid product obtained by filtering to obtain the selenium complex Dimercaptothiadiazole (yield: 94.3%, melting point: 181°C, decomposition temperature: 208°C).

[0047] A kind of mixed rubber, its preparation method comprises the following steps:

[0048] With the styrene-buta...

Embodiment 2

[0050] A kind of selenium coordination dimercaptothiadiazole, its preparation method comprises the following steps:

[0051] 1) Add 4.639g (0.03mol) of dimercaptothiadiazole to 110mL of ethylene glycol, control the speed of the stirrer to 400rpm, and stir at 50°C for 20min to obtain a dimercaptothiadiazole solution;

[0052] 2) Add 2.175g (0.02mol) of selenium dioxide into 50mL of absolute ethanol, control the rotation speed of the stirrer to 400rpm, and stir at 50°C for 20min to obtain a selenium dioxide solution;

[0053] 3) Slowly add the selenium dioxide solution into the dimercaptothiadiazole solution, react at 50°C for 1.5h after the dropwise addition, filter, dry, pulverize and sieve the solid product obtained by filtration to obtain the selenium complex Dimercaptothiadiazole (yield: 93.8%, melting point: 183°C, decomposition temperature: 209°C).

[0054] A kind of mixed rubber, its preparation method comprises the following steps:

[0055] With the styrene-butadiene ...

Embodiment 3

[0057] A kind of selenium coordination dimercaptothiadiazole, its preparation method comprises the following steps:

[0058] 1) Add 6.186g (0.04mol) of dimercaptothiadiazole to 125mL of ethylene glycol, control the speed of the stirrer to 400rpm, and stir at 60°C for 20min to obtain a dimercaptothiadiazole solution;

[0059] 2) Add 2.175g (0.02mol) of selenium dioxide into 50mL of absolute ethanol, control the rotation speed of the mixer to 400rpm, and stir at 60°C for 20min to obtain a selenium dioxide solution;

[0060] 3) Slowly add the selenium dioxide solution dropwise to the dimercaptothiadiazole solution, react at 60°C for 1.5h after the dropwise addition, filter, dry, pulverize and sieve the solid product obtained by filtering to obtain the selenium complex Dimercaptothiadiazole (yield: 93.1%, melting point: 180°C, decomposition temperature: 208°C).

[0061] A kind of mixed rubber, its preparation method comprises the following steps:

[0062] With the styrene-butadien...

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Abstract

The invention discloses selenium-coordinated dimercaptothiadiazole as well as a preparation method and application thereof. The structural formula of the selenium-coordinated dimercaptothiadiazole isshown in the specification. The preparation method comprises the following step: putting dimercaptothiadiazole and a selenium compound into a liquid dispersion medium to carry out coordination reaction, thereby obtaining the selenium coordination dimercaptothiadiazole. The selenium-coordinated dimercaptothiadiazole can be used as a vulcanizing agent and a vulcanization accelerator, and is good invulcanization effect, excellent in vulcanization acceleration effect, simple to synthesize, safe and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of rubber vulcanization aids, in particular to a selenium-coordinated dimercaptothiadiazole and its preparation method and application. Background technique [0002] Vulcanization is the most critical step in the production process of rubber products. Rubber vulcanization aids mainly include: vulcanizing agents and vulcanization accelerators. In the process of rubber vulcanization, the amount of vulcanizing agent is very small, but it plays a decisive role in the performance of the product. During the vulcanization process of rubber, a series of cross-linking reactions will occur between the rubber and the vulcanizing agent, so that the rubber changes from a linear macromolecule to a three-dimensional network macromolecule, and then exhibits excellent physical and chemical properties (for example: similar High elastic properties of rubber elastomers). [0003] The vulcanization accelerator can promote the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D517/22C08K5/48C08L9/06C08K13/02C08K3/04C08K3/06C08K3/22C08K5/09
CPCC07D517/22C08K3/04C08K3/06C08K3/22C08K5/09C08K5/48C08K13/02C08K2003/2296C08L9/06
Inventor 朱立新杨豪杰江涛颜鹏石川
Owner SOUTH CHINA UNIV OF TECH
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