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Cyanate ester foam plastic

A technology of foamed plastics and cyanate esters, applied in the direction of adhesives, etc., can solve the problems affecting the thermal stability of cyanate ester foamed plastics, the comprehensive performance of the dielectric constant and dielectric loss tangent of mechanical properties, the reduction of the safety of the reaction system, Problems such as high curing temperature, achieve the effect of solving the problem of catalyst residue, excellent dimensional stability and thermal stability, and low curing temperature

Active Publication Date: 2017-12-15
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, the preparation methods of cyanate foamed plastics mainly include the hollow microsphere method and the blowing agent method, etc. However, in the preparation process, the above preparation methods all need to use catalysts, and these catalysts will be used after the preparation is completed. Residues in cyanate foam plastics, thus affecting the thermal stability, mechanical properties, dielectric constant and dielectric loss tangent of cyanate foam plastics, etc.
[0004] In addition, in the existing cyanate ester foam preparation method, the curing temperature of cyanate ester is relatively high (usually above 250° C.), which leads to a decrease in the safety of the reaction system and wastes energy.

Method used

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preparation example Construction

[0102] On the other hand, the present invention also provides a kind of preparation method of cyanate ester foam, comprises the steps:

[0103] Step S1: Mix 100 parts by mass of raw material cyanate ester with 5-30 parts by mass of raw material silazane, and stir evenly to obtain a mixture of cyanate ester and silazane;

[0104] Step S2: heating the mixture of cyanate ester and silazane, keeping it warm, and performing a foaming reaction to obtain a cyanate ester foam prepolymer;

[0105] Step S3: raising the temperature of the reaction system in step S2 and keeping it warm, so that the cyanate ester foam prepolymer undergoes a cross-linking and curing reaction to obtain a cyanate ester foam.

[0106] Compared with the prior art, the preparation method of the cyanate ester foam provided by the invention can generate gas through the in-situ reaction of the raw material silazane and the raw material cyanate ester for nucleation, aggregation and foaming, while the raw material si...

Embodiment 1

[0115] Mix 100 parts by mass of 4,4'-bis(phenylcyanate)ethane with 5 parts by mass of silazane, the structural formula of silazane is (a), in a water bath at a temperature of 10 Under the condition of ℃, stir and mix evenly with magnetic force, then put it into an oven, keep it at 60℃ for 60 minutes, raise the temperature to 150℃, keep it for 2 hours, carry out cross-linking and curing reaction, and obtain cyanate foam plastics.

[0116]

[0117] Known by testing, the density of the cyanate ester foam of embodiment 1 is 0.52g / cm 3 , the porosity is 52.7%.

Embodiment 2

[0119] Mix 100 parts by mass of 4,4'-bis(phenylcyanate)ethane with 10 parts by mass of silazane, the structural formula of silazane is (a), in a water bath at a temperature of 10 Under the condition of ℃, stir and mix evenly with magnetic force, then put it into an oven, keep it at 60℃ for 60 minutes, raise the temperature to 150℃, keep it for 2 hours, carry out cross-linking and curing reaction, and obtain cyanate foam plastics.

[0120]

[0121] Known by testing, the density of the cyanate ester foam of embodiment 2 is 0.48g / cm 3 , the porosity is 56.4%.

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Abstract

The invention relates to cyanate ester foam plastic and belongs to the technical field of polymerization reactions of cyanate ester. On the premise that no catalyst is used, the cyanate ester foam plastic is prepared. The cyanate ester foam plastic is prepared from raw materials in parts by mass as follows: 100 parts of cyanate ester and 5-30 parts of silazane. Gas produced through an in-situ reaction of silazane and cyanate ester is used for nucleation, aggregation and foaming, silazane also can serve as a catalyst to catalyze a cyanate ester foam plastic prepolymer to be subjected to a cross-linking and curing reaction, the problem of catalyst residues of the cyanate ester foam plastic is solved without the catalyst in the preparation process, and the comprehensive performance of the cyanate ester foam plastic is improved.

Description

technical field [0001] The invention relates to a cyanate ester polymerization reaction, in particular to a cyanate ester foam. Background technique [0002] Cyanate ester foam is a kind of polymer material formed by dispersing a large number of gas micropores in cyanate ester resin. It has light weight, heat insulation, sound insulation, low thermal conductivity, high specific strength, and shock load absorption. Etc. In addition, since the cyanate ester resin can form a triazine ring structure after curing, the cyanate ester foam also has excellent dimensional stability and thermal stability, excellent mechanical properties and bonding properties, high glass transition temperature, and moisture absorption. Low efficiency, low toxicity, low thermal expansion coefficient, low dielectric constant, small dielectric loss tangent, etc., so it is widely used in aerospace, submarines and other lightweight structural materials and other fields. [0003] In the prior art, the prep...

Claims

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Application Information

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IPC IPC(8): C08L79/04C08L83/16C08G73/06C08J9/02C09J179/04C09J183/16
CPCC08G73/0644C08G73/065C08G2350/00C08J9/02C08J2205/05C08J2379/04C08J2483/16C08L79/04C08L2201/08C08L2203/14C08L2312/00C09J179/04C08G2110/0066C08L83/16
Inventor 罗永明徐彩虹陈艳杰李永明张宗波曾凡
Owner INST OF CHEM CHINESE ACAD OF SCI