Preparation method of microcapsules for rubber material self-repair

A rubber material and microcapsule technology, applied in the field of self-healing microcapsules, can solve the problems of high modulus of epoxy resin, affect the overall performance, poor compatibility, etc., and achieve the effect of expanding the research scope and application field

Active Publication Date: 2013-08-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, epoxy resin has a high modulus and poor compatibility with the rubber body. If it is used as a repair agent for rubber materials, it will affect the overall performance of the repaired material. Therefore, it is necessary to find a suitable repair agent to meet the needs of self-healing rubber materials.

Method used

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  • Preparation method of microcapsules for rubber material self-repair
  • Preparation method of microcapsules for rubber material self-repair
  • Preparation method of microcapsules for rubber material self-repair

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Dissolution of emulsifier: Take 1.25g ethylene-maleic anhydride copolymer purchased from Sigma-Aldich Company, put it into a beaker filled with 250ml deionized water, stir and heat up to 85°C and keep it warm for 1h until it is completely dissolved and emulsified agent aqueous solution.

[0030] Preparation of UF prepolymer: Add 5g urea and 13.51g formaldehyde solution with a mass fraction of 37% into a three-necked flask, add deionized water, stir until dissolved, adjust the pH value of the system to 8~9 with triethanolamine aqueous solution, and heat Reaction at 70°C for 1h.

[0031] Add 0.5g of ammonium chloride and 0.5g of resorcinol to the emulsifier solution, add 12.5g of dicyclopentadiene under mechanical stirring, stir at 800rpm for 20min, and adjust the pH to 3.5. Add UF prepolymer, raise the room temperature to 55°C, react for 3 hours, filter, wash, and dry the powder obtained as self-healing microcapsules, such as figure 1 shown.

[0032] Take 0.2g of mic...

Embodiment 2

[0036] Dissolution of emulsifier: Get 2g of ethylene-maleic anhydride copolymer purchased from Sigma-Aldich, put it into a beaker filled with 250ml of deionized water, stir and heat up to 85°C and keep it warm for 1h until it is completely dissolved to obtain emulsifier aqueous solution.

[0037] Preparation of UF prepolymer: Add 7g urea and 17.1g formaldehyde solution with a mass fraction of 37% into a three-necked flask, add a certain amount of deionized water, stir until dissolved, and adjust the pH value of the system to 8~ with triethanolamine solution 9. Heat to 70°C for 1 h.

[0038] Add 0.7g of ammonium chloride and 0.7g of resorcinol to the emulsifier solution, add 10g of dicyclopentadiene under mechanical stirring, stir at 800rpm for 25min, and adjust the pH to 3.5. Add UF prepolymer, raise the room temperature to 60°C, react for 3 hours, filter, wash, and dry the powder to obtain self-healing microcapsules. Such as figure 2 shown

[0039] Take 0.5g of microcaps...

Embodiment 3

[0043] Dissolution of emulsifier: Take 2.5g of ethylene-maleic anhydride copolymer purchased from Sigma-Aldich Company, put it into a beaker filled with 250ml of deionized water, stir and heat up to 85°C and keep it warm for 1h until it is completely dissolved and emulsified agent aqueous solution.

[0044] Preparation of UF prepolymer: Add 9g urea and 19.46g formaldehyde solution with a mass fraction of 37% into a three-necked flask, add a certain amount of deionized water, stir until dissolved, and adjust the pH value of the system to 8~9, heated to 70°C for 1h.

[0045] Add 0.9 g of ammonium chloride and 0.9 g of resorcinol to the emulsifier solution, add 10 g of dicyclopentadiene under mechanical stirring, stir at 800 rpm for 30 min, and adjust the pH to about 3.5. Add UF prepolymer, raise the room temperature to 65°C, react for 3 hours, filter, wash, and dry the powder to obtain self-healing microcapsules. Such as image 3 shown

[0046] Take 1g of microcapsules and 0...

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Abstract

The invention relates to a preparation method of microcapsules for rubber material self-healing, belonging to the field of self-repair microcapsules. By adopting an in-situ polymerization method, the wall material urea-formaldehyde resin is coated on the surface of the repair agent core material dicyclopentadiene liquid drop to form microcapsules. An impregnation film spreading method is utilized to compound the microcapsules with natural latex, so that the microcapsules can break and release the repair agent to fill up the cracks and heal the wounds when the rubber substrate is damaged. The invention provides a new technical way for prolonging the service life of the rubber material.

Description

technical field [0001] The invention belongs to the field of self-repairing microcapsules. Background technique [0002] Today, with the rapid development of science and technology, the performance of polymer materials is constantly improving, and they are more and more widely used in various fields of people's lives, and can even replace some metal materials. However, polymer materials also have disadvantages. Cracks will appear in the internal structure of polymer materials during processing and use. Such cracks are extremely difficult to detect and repair, and will lead to a decline in the mechanical properties of the material. At least it will affect the use, and at the worst it will threaten others. life safety. Therefore, it is very important to be able to detect and repair cracks in time. [0003] By imitating the principle of self-repair of biological damage, the US military first proposed the concept of intelligent composite materials with self-diagnosis and self-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/08C08L9/04C08L7/02C08K13/06C08K9/10C08K5/01C08K3/06C08K3/22C08J3/24B01J13/18
Inventor 刘力刘小辰温世鹏
Owner BEIJING UNIV OF CHEM TECH
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