Lightweight slightly ablative composite material, and preparation method thereof

A composite material and lightweight technology, which is applied in the field of lightweight micro-ablative composite materials and their preparation, can solve the problems of low thermal decomposition temperature, composite material damage, and strength reduction, and achieve high melting point, enhanced structural strength, and strength and the effect of increasing the carbon residue rate

Active Publication Date: 2019-07-02
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the traditional phenolic resin contains a large number of unstable ether bonds, the thermal decomposition temperature is low, and the carbon residue rate is low at high temperature. , causing the composite material to be quickly destroyed by the airflow

Method used

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  • Lightweight slightly ablative composite material, and preparation method thereof
  • Lightweight slightly ablative composite material, and preparation method thereof
  • Lightweight slightly ablative composite material, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Such as figure 1 As shown, the preparation method of a light-weight micro-ablative composite material in this embodiment includes the following steps:

[0036] (1) Resin synthesis: first add 37% formaldehyde solution and phenol, the molar ratio of the two is 1.2:1, that is, weigh 97.3g of 37% formaldehyde solution and 94.1g of phenol, put them into a three-necked flask with a condenser, stir, Add sodium hydroxide to adjust the pH value to 8, raise the temperature to 70°C, and react for 3 hours; continue to add zirconium oxychloride and triisopropyl borate into the three-necked flask at the same time, and the molar mass of zirconium oxychloride is 5 times that of phenol. %, namely 8.91g, the molar mass of triisopropyl borate is 10% of the molar mass of phenol, namely 18.81g, heated up to 93°C, reacted for 3h under the condition of reflux and stirring, cooled to room temperature, and dehydrated in vacuum to obtain solid zirconium boron modified phenolic resin.

[0037] ...

Embodiment 2

[0043] A method for preparing a lightweight micro-ablative composite material in this embodiment comprises the following steps:

[0044] (1) Resin synthesis: first add 37% formaldehyde solution and phenol, the molar ratio of the two is 1.5:1, that is, weigh 121.6g of 37% formaldehyde solution and 94.1g of phenol, put them into a three-necked flask with a condenser, and stir. Add sodium hydroxide as a catalyst, adjust the pH value to 8, raise the temperature to 72°C, and react for 3 hours; continue to add zirconium oxychloride and triisopropyl borate to the three-necked flask at the same time, and the molar mass of zirconium oxychloride is that of phenol 8% of the molar mass, i.e. 14.35g, the molar mass of triisopropyl borate is 8% of the molar mass of phenol, i.e. 15.04g, heated up to 95°C, reacted for 3h under reflux and stirring conditions, cooled, and vacuum dehydrated to obtain Solid zirconium boron modified phenolic resin.

[0045] (2) Preparation of phenolic impregnatio...

Embodiment 3

[0051] A method for preparing a lightweight micro-ablative composite material in this embodiment comprises the following steps:

[0052] (1) Resin synthesis: first add 37% formaldehyde solution and phenol, the molar ratio of the two is 1.3:1, that is, weigh 105.4g of 37% formaldehyde solution and 94.1g of phenol, put them into a three-necked flask with a condenser, and stir. Add an appropriate amount of sodium hydroxide as a catalyst, adjust the pH value to 9, raise the temperature to 70°C, and react for 2 hours; continue to add zirconium oxychloride and triisopropyl borate to the three-necked flask at the same time, and the molar mass of zirconium oxychloride is 20% of the molar mass of phenol, which is 35.87g, and the molar mass of triisopropyl borate is 5% of the molar mass of phenol, which is 9.41g. Heating up to 92°C, reacting for 2.5h under reflux and stirring conditions, cooling down, vacuum After dehydration, a solid zirconium boron modified phenolic resin is obtained....

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Abstract

The invention discloses a lightweight slightly ablative composite material, and a preparation method thereof. According to the preparation method, zirconium boron modified phenolic resin is taken as amatrix, and ceramic fiber needled felt is taken as a reinforcement, at 2000 DEG C, 30s of ablation is carried out with oxyacetylene flame, the mass ablation rate is controlled to be 0.0025-0.02 g / s,and the linear ablation rate is controlled to be 0.0085 to 0.0520 mm / s. The preparation method comprises the following steps: synthesizing preparation of the zirconium boron modified phenolic resin, preparation of a phenolic resin solution, impregnating of the flexible ceramic fiber needled felt with the phenolic resin solution, curing and cross-linking, and drying. The lightweight slightly ablative composite material possesses advantages such as low density, excellent anti-insulation performance, and simple preparation process.

Description

technical field [0001] The invention relates to the field of resin-based thermal protection composite materials, in particular to a lightweight micro-ablation composite material and a preparation method thereof. Background technique [0002] When the aircraft is flying at high speed in the atmosphere, it will squeeze and rub against the air to generate a large amount of aerodynamic heat, so all kinds of high-speed aircraft are facing serious thermal barrier problems. If the external heat is not effectively managed and controlled, it will cause the aircraft to overheat or even burn out. Therefore, thermal protection materials are needed to protect the aircraft structure and internal equipment. At present, it can be divided into two categories according to the working conditions: reusable thermal protection system and ablative thermal protection system. The reusable thermal protection system does not undergo chemical and physical changes during flight and reentry, but there ...

Claims

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Application Information

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IPC IPC(8): C08L61/14C08K7/26C08K7/08
CPCC08K7/08C08K7/26C08L61/14
Inventor 彭志航曹峰陈莉费厚军
Owner NAT UNIV OF DEFENSE TECH
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