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Urea resin wrapped dicyclopentadiene nanometer microcapsule, and synthetic method and application thereof

A technology of dicyclopentadiene and nano-microcapsules, which is applied in the preparation of microcapsule preparations and microspheres, can solve the problems of large particle size, and achieve the effects of uniform particle size distribution, easy operation, and simple preparation methods

Inactive Publication Date: 2012-06-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention will solve the technical problem of large particle size of the existing urea-formaldehyde resin-coated dicyclopentadiene nano-microcapsules, and provide urea-formaldehyde resin-coated dicyclopentadiene nano-microcapsules and its synthesis method and application

Method used

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  • Urea resin wrapped dicyclopentadiene nanometer microcapsule, and synthetic method and application thereof
  • Urea resin wrapped dicyclopentadiene nanometer microcapsule, and synthetic method and application thereof
  • Urea resin wrapped dicyclopentadiene nanometer microcapsule, and synthetic method and application thereof

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specific Embodiment approach 1

[0017] Embodiment 1: The urea-formaldehyde resin-coated dicyclopentadiene nano-microcapsules of this embodiment are spherical particles made of urea-formaldehyde resin as the wall shell and dicyclopentadiene as the core material, and the diameter of the spherical particles is 400nm~800nm .

[0018] The urea-formaldehyde resin-coated dicyclopentadiene nano-microcapsules in this embodiment are in the form of powder, the surface is dense and smooth, and the size of the microcapsules is controllable, which can be well adhered to the matrix material. It is used as an intelligent repair material for composite materials , when the composite material is micro-damaged and cracks are generated, the crack propagation leads to the rupture of the microcapsules, which can release the core material as a repair agent to repair the composite material. The urea-formaldehyde resin-coated dicyclopentadiene nano-microcapsules realizes a self-repairing efficiency of more than 60%.

specific Embodiment approach 2

[0019] Embodiment 2: This embodiment differs from Embodiment 1 in that the diameter of the spherical particles is 500 nm to 700 nm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0020] Specific embodiment three: the preparation method of the urea-formaldehyde resin-coated dicyclopentadiene nano-microcapsules of the present embodiment is carried out according to the following steps:

[0021] 1. The molar ratio of urea to formaldehyde in formaldehyde solution is 1:1.8~2.2, the mass ratio of urea to resorcinol is 1:0.03~0.07, urea to NH 4 The mass ratio of Cl is 1:0.03-0.07, and weigh urea, formaldehyde solution with a mass concentration of 35%-37%, resorcinol and NH 4 Cl;

[0022] 2. First add the urea weighed in step 1 and the formaldehyde solution with a mass concentration of 35% to 37% into the reactor, stir to dissolve the urea, and then add the resorcinol and NH 4 Cl, after stirring for 30min to 40min at a stirring rate of 800 to 1000 rpm, adjust the pH of the solution to 8 to 9 with triethanolamine; raise the temperature to 65°C to 75°C and keep it for 1h to 2h to obtain a prepolymer ;

[0023] Three, according to the volume ratio of prepolymer...

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Abstract

The invention discloses a urea resin wrapped dicyclopentadiene nanometer microcapsule, and a synthetic method and application thereof, and relates to a self-repair material, and a synthetic method and application thereof. The urea resin wrapped dicyclopentadiene nanometer microcapsule is a nanometer spherical granule prepared from urea resin used as a wall shell, and dicyclopentadiene used as a core material. The method comprises the following steps of: adding urea and a formaldehyde solution into a reactor, stirring uniformly, adding resorcinol and NH4Cl, regulating a pH value, and heating and reacting to obtain a prepolymer; and adding a sodium dodecyl benzene sulfonate solution into the dicyclopentadiene and the prepolymer, mixing the dicyclopentadiene and the prepolymer, regulating the pH value until the solution is acidic, heating, cooling the obtained suspension, washing, filtering and drying to obtain the urea resin wrapped dicyclopentadiene nanometer microcapsule. The self-repair efficiency of the nanometer microcapsule is over 60 percent, the preparation method is simple and easy to operate, and the yield is between 80 and 85 percent. The urea resin wrapped dicyclopentadiene nanometer microcapsule can be used for composite materials of aerospace.

Description

technical field [0001] The present invention relates to a self-repairing material and its synthesis method and application. Background technique [0002] With the development of science and technology, composite materials are widely used in the fields of aviation and aerospace, but they are often affected by the external environment during use, and tiny cracks often occur inside the material. If these microcracks cannot be repaired in time, they will expand rapidly and lead to a decrease in the mechanical properties of the material, thereby affecting the service life of the material. The microcapsules obtained by the existing preparation method of urea-formaldehyde resin-coated dicyclopentadiene microcapsules are micron-sized materials with large particle diameters. When used in resin matrix materials, the mechanical properties of the matrix itself are greatly reduced, generally by 40 %~60%, not suitable for application. Contents of the invention [0003] The invention a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/10C08K5/01B01J13/02C08G14/08C08L63/00
Inventor 齐晶瑶朱孟花李欣
Owner HARBIN INST OF TECH
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