Preparation method of surface-modified self-healing type microcapsule

A surface modification and self-healing technology, applied in microcapsule preparation, microsphere preparation, coating, etc., can solve problems such as decrease in strength of composite materials, decrease in tensile strength and maximum load of resin matrix, and failure of microcapsules to work normally. , to achieve the effect of improving the impact

Inactive Publication Date: 2013-09-25
GUANGDONG PHARMA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the interface between the microcapsule and the resin matrix is ​​generally a physical connection. This interface effect will bring about a decrease in the strength of the composite material, and will also cause the microcracks in the body to expand to the interface and bypass the capsule along the weak point of the interface. Expand rather than break the capsule, so that the microcapsules cannot work normally, so the degree of interfacial bonding between the microcapsules and the resin matrix is ​​a key factor affecting the performance and self-healing efficiency of the composite
Aiming at the problem that the tensile strength and maximum load of the resin matrix decrease significantly with the increase of the amount of microcapsules added in the connection mode between the existing microcapsules and the resin matrix, it is urgent to provide a better surface modification method for self-healing microcapsules. sexual method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Add urea and formaldehyde with a molar ratio of 1:2 into a beaker, stir magnetically until the urea is completely dissolved, adjust the pH of the mixed solution to 8-9 with triethanolamine, and react at a constant temperature of 70°C for 90 minutes to obtain Milky white viscous prepolymer of self-healing microcapsules;

[0035] 2) Add 29.6g of epoxy resin E-51 into a three-necked flask, add 0.37g of emulsifier sodium dodecylbenzene sulfonate, stir and emulsify in a water bath at 50°C for 20 minutes, and prepare self-healing microcapsules O / W type emulsion of capsule core material;

[0036] 3) Add 20 parts by weight of the prepolymer prepared in step 1) to 47 parts by weight of the emulsion prepared in step 2), stir and mix well, add 1 part by weight of resorcinol, 1 part by weight of NaCl, 20 parts by weight Parts by weight of deionized water, mix well, slowly adjust the pH to 3 with dilute hydrochloric acid, heat up to 60°C, and react at a constant temperature for ...

Embodiment 2

[0040] 1) Add urea and formaldehyde with a molar ratio of 1:1.5 into a beaker, stir magnetically until the urea is completely dissolved, adjust the pH of the mixed solution to 8-9 with triethanolamine, and react at a constant temperature of 65°C for 120 minutes to obtain Milky white viscous prepolymer of self-healing microcapsules;

[0041] 2) Add 29.6g of epoxy resin E-44 into a three-necked flask, add 0.30g of emulsifier sodium dodecylsulfonate, and stir and emulsify in a water bath at 40°C for 18 minutes to prepare microcapsules for self-healing O / W type emulsion of core material;

[0042] 3) Add 19 parts by weight of the prepolymer prepared in step 1) to 45 parts by weight of the emulsion prepared in step 2), stir and mix well, add 1 part by weight of resorcinol, 1 part by weight of NaCl, 18 Parts by weight of deionized water, mix well, slowly adjust the pH to 2 with dilute hydrochloric acid, heat up to 55°C, and react at a constant temperature for 4 hours; after the reac...

Embodiment 3

[0046] 1) Add urea and formaldehyde with a molar ratio of 1:1.8 into a beaker, stir magnetically until the urea is completely dissolved, adjust the pH of the mixed solution to 8-9 with triethanolamine, and react at a constant temperature of 70°C for 100 minutes to obtain Milky white viscous prepolymer of self-healing microcapsules;

[0047] 2) 29.6g of epoxy resin E-35 was added to a three-necked flask, 0.89g of emulsifier gum arabic was added, stirred and emulsified in a water bath at 50°C for 15 minutes, and O / W type emulsion;

[0048] 3) Add 23 parts by weight of the prepolymer prepared in step 1) to 51 parts by weight of the emulsion prepared in step 2), stir and mix well, add 2 parts by weight of resorcinol, 3 parts by weight of NaCl, 28 Parts by weight of deionized water, mix well, slowly adjust the pH to 3 with dilute hydrochloric acid, heat up to 58°C, and react at a constant temperature for 3.5 hours; after the reaction is completed, the obtained product is suction-...

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Abstract

The invention discloses a preparation method of a surface-modified self-healing type microcapsule. The preparation method comprises the steps of synthesizing the self-healing type microcapsule of Poly-urea formaldehyde coated epoxy resin firstly, and then performing surface modification treatment on the microcapsule by using fluothane coupling agent. By adopting the surface-modified self-healing type microcapsule, the affect on the mechanical property of a composite material caused by the self-healing type microcapsule is significantly improved, and therefore, the method provided by the invention is more suitable for the surface modification of the self-healing type microcapsule; furthermore, as the fluorine groups are existent on the surface of the microcapsule, the surface energy of a film can be reduced, and the hydrophobic property and the antifouling property are improved as well.

Description

technical field [0001] The invention relates to a preparation method of surface-modified self-repairing microcapsules. Background technique [0002] Polymer materials are widely used in aviation, aerospace, electronics, bionics, urban construction and other fields. During use, these materials are often subjected to stress shocks to produce microcracks. The cracks are usually inside the polymer, which is generally difficult to detect and repair. The propagation of cracks will lead to the degradation of the mechanical properties of the material, which may lead to poor electrical pathways and even open circuits in microelectronic polymers. Even regardless of their functional use, microcracks can lead to degradation of the mechanical properties of composites and even fractures leading to accidents. [0003] Inspired by the self-healing mechanism of biological damage, people imagine that smart composite materials with self-healing function can be developed. When the material is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/18C09D7/12
Inventor 蔡秀兰曲爱兰符大天
Owner GUANGDONG PHARMA UNIV
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