Synthesis process of nitrile rubber modified phenolic resin for aramid honeycomb,

A technology of nitrile rubber and phenolic resin, which is applied in the field of composite materials, can solve the problems of resin curing, difficult curing of honeycomb, and failure to meet the requirements of aramid honeycomb curing process, etc., to achieve improved flexibility, good wettability, and low catalytic activity. Effect

Active Publication Date: 2018-06-22
安徽复材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, judging from the technical scheme disclosed in this patent, the synthetic resin is a phenolic foamed resin, and the general viscosity is between 2000 and 15000 cps. Although the dehydration process is performed, the resin still contains a certain amount of moisture (generally not less than 6 %), belongs to water-soluble phenolic resin
[0006] If the patent CN106700002A process is used to dehydrate the resin until the resin viscosity is between 20 and 40 cps, the resin will contain a large amount of water. After the aramid honeycomb is impregnated, the honeycomb is difficult to cure, which does not meet the requirements of the aramid honeycomb curing process; if the patent CN106700002A process is used for dehydration, Dehydration to 100°C, due to the use of NaOH catalyst, it is very easy to cause the resin to solidify during the dehydration process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of synthetic technique of nitrile rubber modified phenolic resin for aramid fiber honeycomb, adopts the following steps:

[0042](1) Prepare materials according to the following components and contents: 1000g of phenol, 1000g of formaldehyde of 37wt%, 20g of ammonia catalyst, 20g of carbonamide, 10g of nitrile rubber, 800g of organic solvent methanol;

[0043] (2) Heat to dissolve phenol and put it into a reaction vessel, start stirring, add nitrile rubber and stir at a constant temperature at 58°C until the nitrile rubber is completely dissolved;

[0044] (3) Add formaldehyde and catalyst and then conduct heating reaction, the temperature is controlled at 90°C, react until the reaction solution is at 150°C, the time for cross-linking and curing to occur is 120s, then cool down to 60°C;

[0045] (4) add carboxamide, continue constant temperature reaction at 60 DEG C;

[0046] (5) Use vacuum dehydration, after dehydration to 100°C, switch to normal pressure reflu...

Embodiment 2

[0050] A kind of synthetic technique of nitrile rubber modified phenolic resin for aramid fiber honeycomb, adopts the following steps:

[0051] (1) Prepare raw materials according to the following components and contents: 1000g of phenol, 1035g of formaldehyde of 37wt%, 30g of catalyst triethylamine, 25g of carbonamide, 15g of nitrile rubber, 1000g of organic solvent ethanol;

[0052] (2) Heat to dissolve phenol and put it into a reaction vessel, start stirring, add nitrile rubber and stir at a constant temperature at 58°C until the nitrile rubber is completely dissolved;

[0053] (3) Add formaldehyde and catalyst and then conduct heating reaction, the temperature is controlled at 92°C, react until the reaction solution is at 150°C, the time for cross-linking and curing to occur is 125s, and then cool down to 62°C;

[0054] (4) Add carboxamide and continue the constant temperature reaction at 62°C;

[0055] (5) Use vacuum dehydration, after dehydration to 100°C, switch to nor...

Embodiment 3

[0059] A kind of synthetic technique of nitrile rubber modified phenolic resin for aramid fiber honeycomb, adopts the following steps:

[0060] (1) Prepare raw materials according to the following components and contents: 1000g of phenol, 1380g of formaldehyde of 37wt%, 30g of catalyst triethylamine, 25g of carbonamide, 15g of nitrile rubber, 1000g of organic solvent ethanol;

[0061] (2) Heat to dissolve phenol and put it into a reaction vessel, start stirring, add nitrile rubber and stir at a constant temperature at 58°C until the nitrile rubber is completely dissolved;

[0062] (3) Add formaldehyde and catalyst and then conduct heating reaction, the temperature is controlled at 92°C, react until the reaction solution is at 150°C, the time for cross-linking and curing to occur is 125s, and then cool down to 62°C;

[0063] (4) Add carboxamide and continue the constant temperature reaction at 62°C;

[0064] (5) Use vacuum dehydration, after dehydration to 100°C, switch to nor...

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Abstract

The invention relates to a synthesis process of nitrile rubber modified phenolic resin for an aramid honeycomb. Adopted raw materials comprise phenol, formaldehyde, a catalyst, carbamide, nitrile rubber and an organic solvent. The synthetic process comprises the following steps: carrying out heating to dissolve the phenol and adding the nitrile rubber, then adding the formaldehyde and the catalyst, carrying out heating for a reaction, carrying out cooling when the reaction is carried out to a certain degree and adding the carbamide, carrying out vacuum dewatering, then adding a part of the organic solvent, carrying out cooling, adding a part of the organic solvent, then continuing to carrying out cooling, finally adding the remaining organic solvent, and then carrying out cooling rapidly to room temperature to obtain the nitrile rubber modified phenolic resin for the aramid honeycomb. Compared with the prior art, the flexibility of the phenolic resin is greatly improved, and the strength of the honeycomb core material made of the phenolic resin impregnated aramid honeycomb paper prepared through the method is greatly improved.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a synthesis process of nitrile rubber modified phenolic resin for aramid honeycomb. Background technique [0002] Aramid honeycomb sandwich structure has been widely used in aerospace and other military fields due to its high specific strength, high specific stiffness, heat insulation, wave transmission and excellent dielectric properties. The honeycomb sandwich structure is mainly composed of skin, adhesive film and honeycomb core material. The overall performance of the structure is mainly determined by the performance of the core material. If the strength of the honeycomb core material is not enough, the collapse of the entire sandwich structure will easily occur. [0003] There are many kinds of impregnating resins used in the preparation process of honeycomb core materials, including carbonamide resin, pitch resin, phenolic resin and epoxy resin, among which the honeycomb ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28C08L61/14
CPCC08G8/28C08L61/14
Inventor 杨金平薛永顺
Owner 安徽复材科技有限公司
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