Ablation-resistant material for metal connecting piece of rocket projectile

By combining modified bisphenol A boron phenolic resin with modified boron nitride nanosheets, carboxyl-terminated liquid nitrile rubber, and high-silica fibers, an ablation material with good heat resistance and adhesion is formed, which solves the problems of insufficient high temperature resistance and bonding strength of rocket projectile metal connectors and achieves a highly efficient thermal protection effect.

CN120923962APending Publication Date: 2025-11-11BENGBU HIGH TEMPERATURE RESISTANT RESIN FACTOR
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Patent Information

Application Number
CN202511063462.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-31
Publication Date
2025-11-11

AI Technical Summary

Technical Problem

Existing polymer ablation materials are insufficient in terms of high temperature resistance, mechanical properties, and bonding strength in rocket projectile metal connectors, making it difficult to meet the requirements of extreme working environments. Furthermore, traditional high-temperature alloy cooling technologies are costly and complex.

Method used

A combination of modified bisphenol A boron phenolic resin, modified boron nitride nanosheets, carboxyl-terminated liquid nitrile rubber, and high-silica fibers is used to form a three-dimensional cross-linked network structure through -BO- bonds, which enhances the heat resistance and adhesion of the material. The nanosheets provide thermal insulation in the gas phase and condensed phase, while the high-silica fibers form a carbonized layer for composite protection.

Benefits of technology

It significantly improves the material's high-temperature resistance, mechanical properties, and ablation resistance, solves the interface delamination problem, and forms a highly efficient thermal protection system suitable for the harsh environment of rocket projectile metal connectors.

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Abstract

The invention discloses an ablation-resistant material for a rocket projectile metal connecting piece, and belongs to the technical field of ablation materials. Comprising the following raw materials in parts by weight: 70-80 parts of bisphenol A, 17-23 parts of boric acid, 31-43 parts of paraformaldehyde, 6-9 parts of oxalic acid, 2-10 parts of modified boron nitride nanosheets, 4-8 parts of carboxyl-terminated liquid nitrile rubber, 20-30 parts of high silica fibers and 0.7-1.1 parts of a forming auxiliary agent. Wherein boric acid and bisphenol A react to generate boron phenolic resin, so that the high temperature resistance, flexibility and ablation resistance of the material are improved; wherein the modified boron nitride nanosheets can significantly improve ablation resistance and heat resistance to a certain degree; wherein the carboxyl-terminated liquid nitrile rubber improves the adhesion between the material and a metal matrix, and enhances the toughness and impact resistance of the material at the same time; wherein the high-silica fibers are used as inorganic reinforced fibers, so that the ablation resistance is improved; therefore, the metal connecting piece has important application value in the field of metal connecting pieces of rocket projectiles.
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