Preparation method of sulphur microcapsule used as rubber vulcanizing agent

A technology of microcapsules and vulcanizing agents is applied in the field of preparation of single-shelled sulfur microcapsules, which can solve the problems of dangerous production operation, equipment corrosion, unfavorable wide application of rubber products, etc. Effects of vulcanization problems

Inactive Publication Date: 2012-08-08
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the disadvantages of high energy consumption and serious equipment corrosion; at the same time, carbon disulfide is flammable, explosive, and highly toxic, making the production operation very dangerous
In addition, the price of IS is very expensive, generally several to ten times that of ordinary sulfur, which is not conducive to the wide application of rubber products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Prepare the quality of each component that can be used as the sulfur microcapsule of rubber vulcanizing agent as follows:

[0015] Sublimed sulfur 15.1g

[0016] Urea 10.2g

[0017] 37% formaldehyde solution 20.3g

[0018] OP-10 Surfactant 0.5g

[0019] Polyvinyl alcohol 1.0g

[0020] Water 43.5g

[0021] Triethanolamine 0.5g

[0022] Formic acid 0.75g

[0023] The preparation method of sulfur microcapsules that can be used as rubber vulcanizing agent is as follows:

[0024] (1) Add 10.2 g of urea and 20.3 g of 37% formaldehyde solution to a four-necked flask, dropwise add 0.5 g of triethanolamine, adjust the pH value to 8-9, and stir and react at 70° C. for 1 h to prepare a urea-formaldehyde resin prepolymer;

[0025] (2) Prepare an aqueous solution containing 1.5g polyvinyl alcohol, add 0.5g OP-10 surfactant, heat and stir to prepare an aqueous phase solution;

[0026] (3) Add sublimated sulfur into the aqueous phase solution, shear and disperse for 5 minutes ...

Embodiment 2

[0031] The quality of each component of the sulfur microcapsules that can be used as rubber vulcanizing agent is prepared as follows:

[0032] Sublimed sulfur 15.1g

[0033] Urea 7.5g

[0034] 37% formaldehyde solution 14.8g

[0035] Sodium dodecyl sulfonate 0.15g

[0036] Gelatin 1.5g

[0037] Water 43.6g

[0038] Triethanolamine 0.6g

[0039] Formic acid 0.74g

[0040] The preparation method of the sulfur microcapsules that can be used as rubber vulcanizing agent is as follows:

[0041] (1) Add 7.5g of urea and 14.8g of 37% formaldehyde solution to a four-neck flask, dropwise add triethanolamine, adjust the pH value to 8-9, and stir and react at 70°C for 1h to prepare a urea-formaldehyde resin prepolymer;

[0042] (2) Prepare an aqueous solution containing 1.5 g of gelatin, add 0.15 g of sodium dodecylsulfonate, heat and stir to prepare an aqueous phase solution;

[0043] (3) Add sublimated sulfur into the aqueous phase solution, shear and disperse with a shear emuls...

Embodiment 3

[0048] The quality of each component of the sulfur microcapsules that can be used as rubber vulcanizing agent is prepared as follows:

[0049] Sublimed sulfur 14.9g

[0050] Urea 12.5g

[0051] 37% formaldehyde solution 25.1g

[0052] Sodium dodecyl sulfonate 0.15g

[0053] Gum Arabic 1.5g

[0054] Water 43.6g

[0055] Triethanolamine 0.5g

[0056] Formic acid 0.71g

[0057] The preparation method of the sulfur microcapsules that can be used as rubber vulcanizing agent is as follows:

[0058] (1) Add 12.5 g of urea and 25.1 g of formaldehyde solution to a four-neck flask, drop triethanolamine, adjust the pH value to 8-9, and stir and react at 70° C. for 1 hour to prepare a urea-formaldehyde resin prepolymer;

[0059] (2) Prepare an aqueous solution containing 1.5g gum arabic, add 0.15g sodium dodecylsulfonate surfactant, heat and stir to prepare an aqueous phase solution;

[0060] (3) Add sublimated sulfur into the aqueous phase solution, shear and disperse for 5 minutes...

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Abstract

The invention discloses a preparation method of sulphur microcapsule used as rubber vulcanizing agent. Sublimed sulphur is taken as core material and urea resin is taken as capsule wall material, home position polymerization method is adopted to prepare the sulphur microcapsule product, the process is simple and cost is low. The cladded shell of the sulphur microcapsule prepared by the invention can release sulphur at certain temperature, can be used as rubber vulcanizing agent and also can be mixed with rubber mixture to prepare a self-repairing material for tire. Besides, the capsule wall material cladding sulphur is thermoplastic high polymer material such as urea resin which has favourable compatibility with rubber, thus improving performances of ageing resistance and scorching resistance of rubber products.

Description

technical field [0001] The invention belongs to a preparation method of sulfur microcapsules which can be used as a rubber vulcanizing agent, in particular to a preparation method of single-shell sulfur microcapsules. Background technique [0002] Sulfur is a major rubber vulcanizing agent and is widely used in the vulcanization of rubber products. When the amount of sulfur is less than the solubility in rubber, the sulfur is in a stable dissolved state and will not migrate out. When the amount of sulfur is greater than the saturation solubility and is supersaturated, the sulfur is in an unstable dissolved state in the rubber compound. At this time, the temperature drops will cause the sulfur to crystallize and migrate to the surface of the rubber to form sulfur spray. The solubility of sulfur in rubber is affected by its crystal form, ordinary sulfur is S at room temperature 8 Ring structure, orthorhombic α-sulfur crystal, soluble in rubber, when heated to 96°C and then c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/12C08K9/10C08L21/00
Inventor 汪树军李杰刘红研魏斌刘宁王丹
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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