Preparation method of latent catalyst andcyanate ester resin prepreg

A technology of cyanate resin and catalyst is applied in the field of preparation of catalyzed cyanate resin and its composite materials, which can solve the problems of increasing the manufacturing cost of composite materials, unfavorable laying and molding of composite materials, and technological change of prepreg laying and laying. Poor and other problems, to achieve the effect of prolonging the storage period, improving the craftsmanship of paving and sticking, and prolonging the incubation period

Pending Publication Date: 2020-05-19
THE RES INST FOR SPECIAL STRUCTURES OF AERONAUTICAL COMPOSITE AVIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the addition of catalysts (such as phenols, transition metals, etc.), although the curing temperature and time are reduced (177°C*2h), the storage life of this type of cyanate resin system and its prepreg products is greatly shortened. In order to prolong the storage period, low-temperature transportation and low-temperature storage (-20°C storage) have to be adopted, which greatly increases the manufacturing cost of composite materials. In addition, the laying process of this type of prepreg is also deteriorated. It is not conducive to the paving and molding of composite products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Dissolve 8 g of urea and 20 g of formaldehyde solution (37% mass fraction) in distilled water, adjust the pH value to 8.5 with triethanolamine, and stir at a constant temperature of 400 r / min at 70 ° C for 1 h to obtain transparent urea-formaldehyde Resin prepolymer solution, ready for use. Mix a certain amount of emulsifier with 20 g of dibutyltin dilaurate, emulsify in a water bath at 50 °C at a certain speed for 15 min, and add 80 mL of distilled water dropwise to obtain a core material emulsion. At the same time, drop the prepolymer solution into the nonylphenol emulsion of the core material, and acidify it with 10% citric acid solution for a period of time to adjust the pH value to 2-5. After the microcapsules are formed, raise the temperature to 70°C, and continue to stir at a constant temperature for 2 hours. Suction filter the obtained product, wash twice with petroleum ether and distilled water to obtain a filter cake, put it in a constant temperature blast...

Embodiment 2

[0028] (1) Dissolve 4g of urea and 9.46g of formaldehyde solution (37% in mass fraction) in distilled water, adjust the pH value to 8.5 with triethanolamine, and stir at a constant temperature of 400r / min at 70°C for 1h to obtain transparent The urea-formaldehyde resin prepolymer solution is ready for use. Mix a certain amount of emulsifier and 15g organotin, emulsify in a 50°C water bath at a certain speed for 15min, and add 40mL of distilled water dropwise to obtain a core material emulsion. At the same time, drop the prepolymer solution into the nonylphenol emulsion of the core material, and acidify it with 10% citric acid solution for a period of time to adjust the pH value to 2-5. After the microcapsules are formed, raise the temperature to 70°C and continue stirring at constant temperature for 2 hours. Suction filter the obtained product, wash twice with petroleum ether and distilled water to obtain a filter cake, put it in a constant temperature blast drying oven, and d...

Embodiment 3

[0033] (1) Stir methyl methacrylate, copper acetylacetonate, divinylbenzene, and 2,2'-azobisisobutyronitrile with a constant temperature magnetic heating stirrer for 10 minutes under the condition of heating in a water bath at 40°C to form a uniform oil phase Add the oil phase to the continuous phase formed by the sodium salt of styrene-maleic anhydride copolymer, gelatin and water which are heated and stirred under the constant temperature magnetic heating stirrer in advance, and stir vigorously for 15min under the heating of the constant temperature magnetic heating stirrer And form emulsion; This emulsion is dispersed 3min under the dispersing speed of 10000rpm with digital display high-speed homogenizer, makes it form stable oil-in-water emulsion; Emulsion is transferred in the there-necked flask of 250ml, and this reaction system is in React in a 75°C water bath and 550rpm mechanical stirring for 6h, then raise the temperature to 85°C and react for 1h under 550rpm mechanic...

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Abstract

The invention relates to a cyanate ester resin latent catalyst and a preparation method thereof, and belongs to the technical field of preparation of catalytic cyanate ester resin and a composite material thereof. According to the cyanate ester resin latent catalyst prepared by adopting a microcapsule technology, when the prepreg needs to be cured,microcapsules are broken after proper pressure ortemperature is applied on the prepreg, and a curing agent enters a matrix, so that the purpose of catalyzing the curing of a cyanate ester resin is achieved. In addition, the latent catalyst / cyanate ester resin prepreg disclosed by the invention also has better paving manufacturability and is beneficial to forming of the cyanate ester resin-based composite material. The application range of the cyanate ester resin-based related material is widened, and the application prospect is wide. The latent catalyst and the cyanate ester resin prepreg can be used for preparing a skin for a wave-transparent structure integrated part, meet the requirement of an antenna radome and other parts for high wave-transparent rate, can also be used as a copper-clad plate base material, and can be widely appliedto the fields of electronics, aviation and aerospace.

Description

technical field [0001] The invention relates to a cyanate resin latent catalyst, a preparation method thereof and a corresponding preparation method of cyanate prepreg. The invention belongs to the technical field of preparation of catalytic cyanate resin and composite materials thereof. Background technique [0002] As a high-performance resin with excellent dielectric properties, mechanical properties and heat and humidity resistance, cyanate ester (CE) resin has a very wide range of applications in the fields of electronic packaging, aerospace, insulating materials, etc., and has become a huge social , economical resin matrix. However, due to the long curing time of CE, in the absence of a catalyst, it generally needs to be cured for a long time (above 7h) at a higher temperature (above 200°C) to obtain a greater degree of curing crosslinking. However, long-term curing at high temperature often causes more residual stress inside the obtained cured product, resulting in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/24C08G73/06C08K7/10C08L79/04
CPCC08G73/0644C08G73/065C08J5/24C08J2379/04C08K7/10
Inventor 轩立新周凯运王志强苏韬
Owner THE RES INST FOR SPECIAL STRUCTURES OF AERONAUTICAL COMPOSITE AVIC
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