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A kind of ceramic ablation-resistant coating and preparation method thereof

A kind of ablation resistance and coating technology, applied in coatings, fire retardant coatings, etc., can solve the problems of easy cracking of coatings, poor ablation resistance, poor thermal conductivity, etc. Corrosion performance and heat resistance improvement effect

Active Publication Date: 2021-08-20
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention proposes a vitrified ablation-resistant coating and its preparation method to solve the problems of high-temperature curing, poor ablation resistance, poor thermal conductivity, high curing shrinkage, poor toughness, and easy cracking of the coating in the existing coatings. And technical problems of poor spraying process

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  • A kind of ceramic ablation-resistant coating and preparation method thereof

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preparation example Construction

[0036] The preparation method of this coating specifically comprises the following steps:

[0037] (1) Preparation of silicone resin by sol-gel method

[0038] Add the measured alkoxysilane, (aryl) boric acid compound and absolute ethanol into the reaction kettle equipped with a reflux condenser, a magnetic stirring paddle, a thermometer, a thermocouple and a constant pressure dropping funnel, and first raise the temperature to 50-70 ℃, after the (aryl) boronic acid compound is completely dissolved, add an appropriate amount of deionized water and catalyst to the constant pressure dropping funnel, and drop it within 1.5~3h; continue to heat up to 75~120℃, and react for 3~ After 6 hours, distill under reduced pressure, transfer it to a vacuum oven, and keep it at 100-120° C. for 2-4 hours to obtain a silicone prepolymer. Wherein, the molar ratio of alkoxysilane to (aryl)boronic acid compound is 1:0.8-2.5. Next, epoxy resin is used to modify the silicone prepolymer, and the ac...

Embodiment 1

[0051] This embodiment proposes a porcelain ablation-resistant coating, including the following components and mass percentages: 50% to 65% of a silicone resin, 8% to 15% of a curing agent, 25% to 35% of a filler, and 0.1% of an auxiliary agent % to 0.5%.

[0052] The preparation method of this coating comprises the following steps:

[0053] (1) Add metered diphenyldiethoxysilane, 4-(1-naphthyl)phenylboronic acid, absolute ethanol and hydrochloric acid into the In the reaction kettle of the liquid funnel, first raise the temperature to 60°C, and after the 4-(1-naphthyl)phenylboronic acid is completely dissolved, add an appropriate amount of deionized water and catalyst to the constant pressure dropping funnel, and drop it within 1.5h. Addition is complete; continue to heat up to 120°C, react for 4 hours, distill under reduced pressure, transfer it to a vacuum oven and keep it at 100°C for 4 hours to obtain a silicone prepolymer. Wherein, the molar ratio of diphenyldiethoxysi...

Embodiment 2

[0057] This embodiment proposes a porcelain ablation-resistant coating, which includes the following components and mass percentages: 55% to 65% of a silicone resin, 8% to 15% of a curing agent, 20% to 35% of a filler, and 0.1% of an auxiliary agent % to 0.5%.

[0058] The preparation method of this coating comprises the following steps:

[0059] (1) Add the metered mixture of phenyltriethoxysilane, phenylboronic acid and hydroxymethylphenylboronic acid, absolute ethanol and acetic acid into a device equipped with a reflux condenser, a magnetic stirring paddle, a thermometer, a thermocouple and a constant pressure drop In the reaction kettle of the liquid funnel, first raise the temperature to 65 ° C, after the mixture of phenylboronic acid and hydroxymethylphenylboronic acid is completely dissolved, add an appropriate amount of deionized water and acetic acid to the constant pressure dropping funnel, and drop it within 2 hours Addition is complete; continue to heat up to 100...

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Abstract

The present invention proposes a vitrified ablation-resistant coating and its preparation method, which is obtained by optimizing the composition and proportion of the coating. The coating formed by the prepared coating has high bonding strength and can withstand temperatures above 1500°C. Instantaneous high temperature, while having more excellent flame retardant effect and mechanical strength. The ablation-resistant coating prepared by the invention can have the advantages of low thermal conductivity, low linear ablation rate, high mechanical properties, excellent manufacturability and the like. The preparation method of the invention is simple, and provides an effective way for large-scale preparation of ablation-resistant coatings in industry. The ablation-resistant coating can be cured at room temperature, has a thermal conductivity of less than 0.1W / (m·k), and a linear ablation rate of less than 0.02mm / s, and has very broad application prospects in aircraft surface thermal protection systems.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, and in particular relates to a vitrified ablation-resistant coating and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of my country's aerospace and weaponry, more stringent requirements have been placed on the performance of thermal protection materials. The external heat protection coating must not only be able to withstand the strong erosion of its surface by the flight speed of high Mach number, but also require that the appearance of the erosion does not change much and the surface remains flat, so as to ensure the good aerodynamic shape of the aircraft, so as to realize the long-distance precision guidance. Purpose. In such a working environment, extremely high requirements are placed on the temperature resistance and heat protection efficiency of the external heat protection coating. It is required to achieve further lig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D183/08C09D5/18C08G77/22C08G77/398
CPCC08G77/22C08G77/398C09D5/18C09D183/08
Inventor 边城王淑娟闫宁井新利李宏岩朱国伟赵凤起
Owner XIAN MODERN CHEM RES INST
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