Preparation method of silicon-dioxide-coated sulfur microcapsules

A technology of sulfur and coating, applied in the field of preparation of coated sulfur, can solve the problems of restricting the development of insoluble sulfur, poor high temperature stability, poor dispersibility, etc., and achieves good monodispersity, small particle size and simple process. Effect

Active Publication Date: 2015-11-11
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most commercial insoluble sulfur is a mixture of soluble sulfur and insoluble sulfur in different proportions, and there are still a lot of problems with insoluble sulfur, including poor dispersion, high cost, poor high temperature stability, and the use of a large amount of high-temperature sulfur in the extraction process. Volatile organic solvents, etc., restrict the development of insoluble sulfur

Method used

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  • Preparation method of silicon-dioxide-coated sulfur microcapsules
  • Preparation method of silicon-dioxide-coated sulfur microcapsules
  • Preparation method of silicon-dioxide-coated sulfur microcapsules

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The composition and consumption of raw materials for preparing coated sulfur are as follows:

[0017]

[0018] The preparation method of silica-coated sulfur is as follows:

[0019] (1) Add 0.9927g of sodium thiosulfate pentahydrate to an aqueous solution containing 0.05g of PVA at room temperature, and after it dissolves, add 0.8ml of dilute hydrochloric acid dropwise, then stir and react at room temperature for 2 hours to prepare a sulfur water dispersion ;

[0020] (2) Centrifuge and wash the above-mentioned sulfur water dispersion twice, then ultrasonically disperse it in 20ml aqueous solution containing 0.05gPVP, then add 80ml of absolute ethanol, and continue ultrasonically dispersing into a homogeneous emulsion;

[0021] (3) Add dropwise 50ml ethanol solution containing 0.104g tetraethyl orthosilicate upwards as in the sulfur dispersion with a constant pressure dropping funnel, and stir at room temperature for 2 hours after the dropwise addition;

[0022] (4...

Embodiment 2

[0025] The composition and consumption of raw materials for preparing coated sulfur are as follows:

[0026]

[0027] The preparation method of silica-coated sulfur is as follows:

[0028] (1) Add 0.9927g of sodium thiosulfate pentahydrate to an aqueous solution containing 0.2g of PVA at room temperature, and after it dissolves, add 0.8ml of dilute hydrochloric acid dropwise, then stir and react at room temperature for 2 hours to prepare a sulfur water dispersion ;

[0029] (2) Centrifuge and wash the above-mentioned sulfur water dispersion twice, then ultrasonically disperse it in 20ml aqueous solution containing 0.05gPVP, then add 80ml of absolute ethanol, and continue ultrasonically dispersing into a homogeneous emulsion;

[0030] (3) Add dropwise 50ml ethanol solution containing 0.208g tetraethyl orthosilicate upwards as in the sulfur dispersion with a constant pressure dropping funnel, and stir at room temperature for 2 hours after the dropwise addition;

[0031] (4)...

Embodiment 3

[0034] The composition and consumption of raw materials for preparing coated sulfur are as follows:

[0035]

[0036] The preparation method of silica-coated sulfur is as follows:

[0037] (1) After preparing an aqueous solution containing 0.05g of PVP at room temperature, add 4.9636g of sodium thiosulfate pentahydrate to dissolve, then add 4ml of dilute hydrochloric acid dropwise, and then stir and react at room temperature for 2 hours to prepare a sulfur water dispersion;

[0038] (2) Centrifuge and wash the above-mentioned sulfur water dispersion twice, then ultrasonically disperse it in 20ml aqueous solution containing 0.1g gelatin, then add 80ml of absolute ethanol, and continue to ultrasonically disperse into a homogeneous emulsion;

[0039] (3) Use a constant pressure dropping funnel to add dropwise 20ml of ethanol solution containing 1ml tetraethyl orthosilicate to the sulfur dispersion, and stir at room temperature for 2 hours after the dropwise addition;

[0040]...

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Abstract

The invention discloses a preparation method of coated sulfur. By using synthetic sulfur as a core and an inorganic high-polymer material as a film material, the coated sulfur microcapsules are prepared by in-situ modification. Coated sulfur with different film thicknesses and different surface shapes is prepared. The product can be uniformly dispersed during rubber compounding. The compounded rubber can not have the phenomenon of blooming in the parking stage, and can release sulfur at proper speed at curing temperature to participate in crosslinking. The microcapsules have the advantages of simple preparation technique and lower cost, and are a novel vulcanizing agent which is worthy of development.

Description

technical field [0001] The invention belongs to a preparation method of coated sulfur which can be used as a rubber vulcanizing agent, and particularly designs a preparation method of inorganic polymer material coated sulfur. Background technique [0002] At present, the sulfur vulcanizing agent widely used in the rubber industry is mainly elemental sulfur, which has a stable orthorhombic crystal form. Each sulfur molecule is composed of eight sulfur atoms and has a ring structure. However, during the mixing process of the rubber, as the temperature continues to rise, the solubility of ordinary sulfur in the rubber is also increasing. The sulfur that has been well dispersed in the material stage will leave the rubber material system again due to the temperature drop at the storage temperature of the rubber compound, and migrate to the surface of the rubber material, which is the so-called "blooming" phenomenon in the production of tires and rubber products, which is serious ...

Claims

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Application Information

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IPC IPC(8): C08K9/10C08K3/06B01J13/02
Inventor 宗成中陶磊曹兰宗迎夏王春芙
Owner QINGDAO UNIV OF SCI & TECH
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