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Chitosan-urea resin microcapsule and synthesis method thereof

A technology of urea-formaldehyde resin and synthesis method, which is applied in the field of microcapsules, which can solve the problems of weak interface binding force, affecting the repair effect of microcapsules, and rupture of microcapsules, and achieves the effects of good stability, low equipment requirements, and easy operation

Inactive Publication Date: 2011-03-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the interface between the existing microcapsules and the matrix resin material is weak, and the microcracks bypass the microcapsules to expand during use and cannot break the microcapsules, thereby affecting the repairing effect of the microcapsules. The present invention A kind of chitosan-urea-formaldehyde resin microcapsule and its synthetic method are provided

Method used

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  • Chitosan-urea resin microcapsule and synthesis method thereof
  • Chitosan-urea resin microcapsule and synthesis method thereof
  • Chitosan-urea resin microcapsule and synthesis method thereof

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specific Embodiment approach 1

[0015] Specific embodiment one: present embodiment chitosan-urea-formaldehyde resin microcapsule is made up of 3~5 parts of urea-formaldehyde resin prepolymers, 16~24 parts of deacetylated chitosan solutions, 10~20 parts of dicyclopentadiene olefin, 0.03~0.1 part of sodium lauryl sulfate, 0.4~2 part of resorcinol, 0.01~0.1 part of n-butanol and 10~25 parts of deionized water, and the urea-formaldehyde resin prepolymer is made of 8-12 parts of urea and 16-24 parts of formaldehyde solution with a mass concentration of 37% are prepared under the condition of pH value of 8-9.

[0016] The chitosan-urea-formaldehyde resin microcapsules of this embodiment are small white spherical particles with a particle size of 10-160 μm, good stability, and can be stored at room temperature for more than 18 months.

specific Embodiment approach 2

[0017] Specific embodiment two: the difference between this embodiment and specific embodiment one is that chitosan-urea-formaldehyde resin microcapsules are composed of 3.5 to 4.5 parts of urea-formaldehyde resin prepolymer, 18 to 22 parts of chitosan solution in parts by weight , 12~18 parts of dicyclopentadiene, 0.03~0.06 parts of sodium lauryl sulfate, 0.4~0.9 parts of resorcinol, 0.01~0.06 parts of n-butanol and 13~20 parts of deionized water. Other parameters are the same as in the first embodiment.

[0018] The chitosan-urea-formaldehyde resin microcapsules in this embodiment are small white spherical particles with a particle diameter of 30-80 μm.

specific Embodiment approach 3

[0019] Specific embodiment three: what this embodiment is different from specific embodiment one is that chitosan-urea-formaldehyde resin microcapsules are made up of 4 parts of urea-formaldehyde resin prepolymers, 20 parts of deacetylated chitosan solutions, 15 parts of bicyclic Pentadiene, 0.04 parts sodium lauryl sulfate, 0.5 parts resorcinol, 0.02 parts n-butanol and 15 parts deionized water. Other parameters are the same as in the first embodiment.

[0020] The chitosan-urea-formaldehyde resin microcapsules in this embodiment are small white spherical particles with a particle size of 45-55 μm and uniform particle size distribution.

[0021] In this embodiment, chitosan-urea-formaldehyde resin microcapsules are observed with a scanning electron microscope for surface morphology, such as figure 1 shown. Depend on figure 1 It can be seen that the chitosan-urea-formaldehyde resin microcapsules in this embodiment are small spherical particles with a particle ...

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Abstract

The invention provides chitosan-urea resin microcapsule and a synthesis method thereof, belonging to the field of microcapsule, in particular to the chitosan-urea resin microcapsule for self repairing polymer-matrix composite materials and the synthesis method thereof. The invention solves the problem of affecting the effect for repairing the microcapsule because microcrack expands around the microcapsule to lead the microcapsule not to be cracked when in use due to the week interface binding force between the microcapsule and the matrix resin. The microcapsule is made from urea resin prepolymer, chitosan solution, DCPD, lauryl sodium sulfate, resorcinol, normal butanol and deionized water. The synthesis method comprises the steps of: 1. synthesizing urea prepolymer; 2. preparing gelatin microspheric latex system; 3. washing, filtering and drying after polymerization reaction. The microcapsule is white grain, wherein grain diameter is 10-160mu m. The microcapsule is embedded into the resin matrix to be capable of repairing the microcrack in the resin matrix and prolonging the service life of materials.

Description

technical field [0001] The invention belongs to the field of microcapsules, and in particular relates to a chitosan-urea-formaldehyde resin microcapsule for polymer matrix composite material self-repair and a synthesis method thereof. Background technique [0002] Polymer matrix composites are widely used in aerospace and other fields due to their excellent properties. During use, under the action of the surrounding environment, polymer materials will inevitably produce local damage and microcracks, resulting in a decrease in mechanical properties, and in severe cases, material damage will be caused, thereby affecting the service life of the material. Therefore, the microcapsules containing the repairing agent are embedded in the resin matrix. The matrix is ​​damaged and microcracks are generated. The microcracks expand to the microcapsules and cause them to break. Due to capillary action, the repairing liquid in the microcapsules flows into the microcracks and meets The ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/18C08G81/00C08G12/12C08B37/08
Inventor 王荣国胡宏林赫晓东刘文博李海燕袁立业
Owner HARBIN INST OF TECH
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