Dicyclopentadiene microcapsule with melamine methyl aldehyde coating and preparing method thereof

Abstract

The invention involves a melamine formaldehyde coating dicyclopentadiene microcapsule and its preparation methods. Technical characteristics characterized in that: composition is: melamine and formaldehyde solution, dicyclopentadiene, polymerization inhibitor, water, surfactant and defoamer. preparation steps is: put the melamine, formaldehyde solution and water into the bottle, heat and use the lixivium to accommodate the solution, obtain the melamine formaldehyde prepolymer solution; again add emulsifier and defoamer water solution and stir, control the heating rate of the reaction system, preserve heat and end the reaction; wash the product several times, through vacuum filtering and drying microencapsulation products is obtained. Beneficial effect: relatively better heat resistance, excellent mechanical properties and good leak tightness of microcapsules, hoping that the Microencapsulation will be fit for self-repairing of the mid-high temperature shaping materials, after expansion can be used for self-repair of composite materials.

Description

Technical field: [0001] The invention relates to a melamine formaldehyde-coated dicyclopentadiene microcapsule and a preparation method thereof. Background technique: [0002] Currently, self-repair research using microcapsules filled with repair agents embedded in resin-based composites for materials has become a subject of close attention. Due to the strict requirements and particularity of microcapsules used for self-repair of resin matrix composites, there are very few types of microcapsules used for material repair. So far, only the microcapsules with urea-formaldehyde as the wall material and dicyclopentadiene (DCPD) as the capsule core have achieved good results in the repair of resin matrix composites, which were jointly researched by NASA and the University of Illinois. , although the microcapsules have the advantages of good sealing and mechanical properties, but because the polyurea-formaldehyde wall material has the disadvantage of poor thermal stability at high...

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Problems solved by technology

So far, only the microcapsules with urea-formaldehyde as the wall material and dicyclopentadiene (DCPD) as the capsule core have achieved good results in the repair of resin matrix composites, which were jointly researched by NASA and the University of Illinois. , although the microcapsules have the advantages of good sealing and mechanical properties, but because the polyurea-formaldehyde wall material has the disadvantage of poor thermal stability at high temperature, the microcapsules with urea-formaldehyde as the wall material are generally only suitable for molding at room temperature or medium temperature The repair of resin-based composite materials in the process is difficult to meet the repair of composite materials in the molding process of medium-high temperature resin-based composite materials