Preparation method of graphene-sulfur microcapsule composite

A technology of composite materials and graphene, which is applied in the field of preparation of functional vulcanizing agents, can solve the problems of low coating rate, rupture and release of sulfur, and low affinity, so as to improve mechanical properties, solve the problem of blooming, and have strong adsorption capacity. Effect

Inactive Publication Date: 2018-02-23
TANGSHAN JIANHUA TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for sulfur particles, its affinity for macromolecules or polymers is extremely low, and most of them are deposited on the surface through physical adsorption. Therefore, styrene monomers are easy to nucleate in the liquid phase alone to synthesize their own Macromolecular microspheres, which eventually lead to poor coverage
In addition, the process of generating sulfur from sodium thiosulfate pentahydrate is accompanied by the generation of harmful gas sulfur dioxide, which is harmful to the environment and the body,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Take the modified graphene, dissolve it in deionized water, stir and sonicate, and prepare an aqueous solution with a mass concentration of 0.01% for use;

[0024] (2) Weigh sulfur according to the mass ratio of sulfur: modified graphene of 50:1, add it to the polyvinylpyrrolidone solution, stir for 30 minutes, then add it to the modified graphene aqueous solution in step (1), and stir until it is evenly mixed. stand still;

[0025] (3) The mixed solution obtained in step (2) is taken out, and the solid-liquid separation is realized through filtration and centrifugation, and the separated solid is dried by air flow to obtain a graphene-sulfur microcapsule composite material.

Embodiment 2

[0027] (1) Take the modified graphene, dissolve it in deionized water, stir and sonicate, and prepare an aqueous solution with a mass concentration of 5%, which is ready for use;

[0028] (2) Weigh sulfur according to the mass ratio of sulfur: modified graphene of 1000:1, add it to the polyvinyl alcohol solution, stir for 30 minutes, then add it to the modified graphene aqueous solution in step (1), and stir until it is evenly mixed. stand still;

[0029] (3) Taking out the mixed solution obtained in step (2), and treating it with a spray drying method in a stirred state to obtain a graphene-sulfur microcapsule composite material.

Embodiment 3

[0031] (1) Take graphene oxide, dissolve it in deionized water, stir and sonicate to obtain an aqueous solution with a mass concentration of 0.1%, and set it aside;

[0032] (2) Weigh sulfur according to the mass ratio of sulfur: graphene oxide or modified graphene of 500:1, add it to the polyvinyl alcohol solution, stir for 30 minutes, then add it to the graphene oxide aqueous solution in step (1), and stir until Mix well and let stand;

[0033] (3) The mixed liquid obtained in step (2) is taken out, and the solid-liquid separation is realized through filtration and centrifugation, and the separated solid is processed by a low-temperature drying method to obtain a graphene-sulfur microcapsule composite material.

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PUM

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Abstract

The invention relates to a preparation method of a graphene-sulfur microcapsule composite, comprising: first, introducing organic molecules of hydroxy, sulfydryl, amino, carboxy or other groups to thesurface of graphene oxide by means of physical adsorption or chemical grafting; second, preparing graphene-coated sulfur microcapsule by means of mechanical blending. A core material is common sulfur, and the surface of the core material is subjected to graphene oxide or graphene modification to form a core-shell structure. The graphene shell herein can effectively enclose the sulfur therein, andblooming during rubber processing is inhibited; the rich functional groups on the surface or edge of the graphene enable the sulfur to be evenly dispersed in a rubber base during mixing stage and engage in sulfurization reaction during sulfurization stage, thermal stability of the sulfur is improved, and excellent properties are imparted to the composite. The prepared graphene-sulfur microcapsulecomposite has high purity, good thermal stability, high coating rate, high sulfur utilization rate and low cost.

Description

technical field [0001] The invention relates to the field of preparation of functionalized vulcanizing agents, in particular to a method for preparing a graphene sulfur microcapsule composite material applied to rubber. Background technique [0002] Sulfur is the earliest vulcanizing agent used in rubber crosslinking. It is widely used in industry due to its low price, good elasticity and fatigue resistance of vulcanized rubber. However, ordinary sulfur is easy to agglomerate in rubber, and it is difficult to achieve uniform distribution. At the same time, the solubility of sulfur in rubber varies with temperature. Precipitation in the rubber, resulting in blooming phenomenon, which will produce or aggravate the phenomenon of uneven dispersion of sulfur in the rubber matrix, seriously affect the cohesiveness of rubber, and reduce its performance; in addition, sulfur has certain toxicity, especially after being heated. Sulfur vapor and sulfur dioxide produced after oxidation...

Claims

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Application Information

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IPC IPC(8): C08K9/10C08K3/06C08L21/00
CPCC08K9/10C08K3/06C08L21/00
Inventor 耿晓欣吴洪鹏侯林艳陆铭孟英
Owner TANGSHAN JIANHUA TECH DEV
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