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A kind of preparation method of composite double-layer membrane-coated sulfur microcapsules

A technology of microcapsules and double-layer membranes is applied in the field of raw material formulation of coated sulfur, which can solve the problems of low coating rate, lack of theoretical models for combined application, and inability to cross-link, and achieves the advantages of inhibiting blooming and improving compactness. Effect

Active Publication Date: 2018-04-20
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, a lot of work has been carried out around this concept, and sublimated sulfur has been coated with urea-formaldehyde resin, melamine resin, polyvinyl alcohol, gelatin and other related film materials, but the effect is not particularly ideal, and there are various problems. For example, the coating rate is low, the post-treatment of the extractant is required, the strength of the capsule wall material is not enough, resulting in the rupture and release of sulfur during the mixing stage, and "blooming" cannot be avoided. Another example is that the capsule wall material cannot release sulfur during the vulcanization stage, resulting in failure to exchange couplet
Lack of theoretical models to guide the joint application of new wall materials and new methods

Method used

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  • A kind of preparation method of composite double-layer membrane-coated sulfur microcapsules
  • A kind of preparation method of composite double-layer membrane-coated sulfur microcapsules
  • A kind of preparation method of composite double-layer membrane-coated sulfur microcapsules

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Prepare the quality of each component of inorganic-organic composite double-layer membrane sulfur microcapsule as follows:

[0019]

[0020] (1) First, the preparation mass fraction is 2% solution containing PVA, 0.9927g sodium thiosulfate pentahydrate is added in the solution, after dissolving, 0.8ml concentrated hydrochloric acid is added dropwise, and the reaction is stirred at room temperature for 3 hours;

[0021] (2) The above-mentioned dispersion liquid is centrifugally washed, separated, and finally ultrasonically dispersed into a mixed solution whose alcohol-to-water ratio is 95 / 5;

[0022] (3) After transferring to the beaker, add dropwise 1ml of ammonia water to adjust the pH of the system, dropwise add 0.14g tetraethyl orthosilicate in half an hour, and react at room temperature for 2 hours after the dropwise addition, to obtain the coated primary product;

[0023] (4) Add 1ml KH570 to the above solution, stir at room temperature for 6 hours, and transfer...

Embodiment 2

[0028] Prepare the quality of each component of inorganic-organic composite double-layer membrane sulfur microcapsule as follows:

[0029]

[0030] (1) First, prepare an aqueous solution containing 0.01g of PVA, add 0.9927g of sodium thiosulfate pentahydrate particles to the solution, add 0.8ml of concentrated hydrochloric acid dropwise after dissolving, and stir at room temperature for 3 hours;

[0031] (2) The above-mentioned dispersion liquid is centrifugally washed, separated, and finally ultrasonically dispersed into a mixed solution whose alcohol-to-water ratio is 90 / 10;

[0032] (3) After transferring to the beaker, add dropwise 2ml of ammonia water to adjust the pH of the system, add dropwise 0.2g tetraethyl orthosilicate in half an hour, and react at room temperature for 2 hours after the dropwise addition, to obtain the coated primary product;

[0033] (4) Add 1ml KH570 to the above solution, stir at room temperature for 6 hours, and transfer to a four-neck flask;...

Embodiment 3

[0038] Prepare the quality of each component of inorganic-organic composite double-layer membrane sulfur microcapsule as follows:

[0039]

[0040] (1) First, prepare a solution containing 0.02g of polyvinylpyrrolidone, add 2g of sodium thiosulfate pentahydrate particles into the solution, add 1.6ml of concentrated hydrochloric acid dropwise after dissolving, and stir at room temperature for 3 hours;

[0041] (2) The above-mentioned dispersion liquid is centrifugally washed, separated, and finally ultrasonically dispersed into a mixed solution whose alcohol-to-water ratio is 80 / 20;

[0042] (3) After transferring to a beaker, add 2ml of ammonia water dropwise to adjust the pH of the system, add 1.04g tetraethyl orthosilicate dropwise within half an hour, and react at room temperature for 2 hours after the dropwise addition, to obtain the coated primary product;

[0043] (4) Add 4ml KH570 to the above solution, stir at room temperature for 6 hours, and transfer to a four-nec...

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Abstract

The invention discloses a raw material and formula for producing double-layer membrane-coated sulfur. The membrane material is composed of inorganic silicon material and polymer membrane material. This formula prepares an inorganic shell material on the surface of sulfur by in-situ polymerization on the surface, and then grafts a polymer membrane material after surface modification to form a composite membrane material with sulfur as the core material and inorganic silica and polymer as the composite membrane material. coated sulfur. The advantage of the double-layer film is to improve the compactness of the clad core material. The coated sulfur prepared by the formula of the invention is safe and environment-friendly, has high yield, does not need post-extraction treatment, and can be used as a rubber vulcanizing agent.

Description

technical field [0001] The invention belongs to a raw material formula of coated sulfur which can be used as a rubber vulcanizing agent, in particular to a raw material formula of organic-inorganic composite double-layer film coated sulfur. Background technique [0002] As an important inorganic raw material, sulfur has many applications in daily life and production, such as pesticides, gunpowder, medicine, rubber additives and other fields. As the most commonly used vulcanizing agent in rubber, sulfur can melt at the vulcanization temperature and cross-link with rubber macromolecular chains to form a three-dimensional space network structure, which improves the strength necessary for rubber as a functional material. However, due to the defect in the solubility of sulfur itself, the sulfur that can be stably miscible in the rubber during the mixing and vulcanization stage will precipitate on the surface of the rubber compound in the form of crystallization due to the decreas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/10C08K3/06C08F292/00C08F212/08C08F220/14C08F220/06C08F220/18B01J13/02B01J13/14
Inventor 陶磊宗成中曹兰宗迎夏
Owner QINGDAO UNIV OF SCI & TECH