Preparation method of semi-inorganic heat-insulating and wave-permeable coating material

A coating material, semi-inorganic technology, applied in the direction of coating, surface coating liquid device, pretreatment surface, etc., to achieve good bonding strength, shorten curing time, and accelerate crosslinking reaction

Inactive Publication Date: 2013-11-20
10TH RES INST OF CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to address the deficiencies of the current ceramic coatings and high-temperature-resistant organic coatings, and propose a new coating preparation method that tak

Method used

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  • Preparation method of semi-inorganic heat-insulating and wave-permeable coating material
  • Preparation method of semi-inorganic heat-insulating and wave-permeable coating material
  • Preparation method of semi-inorganic heat-insulating and wave-permeable coating material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] At normal temperature and pressure, according to the components specified in Table 1 by weight, in 100 parts of polysilazane, the precursor of ultra-low carbon ceramics, add heat-insulating fillers: 10 parts of quartz powder, hollow glass powder, di One or several kinds of silica airgel powder, add 1 part of silane coupling agent and 100 parts of aromatic hydrocarbon solvent to adjust the viscosity at the same time, and mix the mixture with a high-speed mixer (Yile EBF / III series pneumatic lifting high-speed disperser or high-viscosity mixer, etc.) to disperse, emulsify, and mix, the higher the speed, the better the dispersion effect. Generally stirring for 10-30 minutes (the slower the speed, the longer the time). After stirring and dispersing at high speed for 4 hours, a slurry with uniform filler distribution was obtained. Spray the mixed slurry on the surface of the surface-treated 1mm thick ceramic sheet with a spray gun, the spraying pressure is 0.3MPa-0.6MPa, an...

Embodiment 2

[0032] At normal temperature and pressure, according to the components specified in Table 1 by weight, in 100 parts of polysilazane, the precursor of ultra-low carbon ceramics, add heat-insulating fillers: 50 parts of quartz powder, hollow glass powder, di One or more of the silica airgel powders, 5 parts of silane coupling agent and 100 parts of aromatic hydrocarbon solvent are added at the same time to adjust the viscosity, and after high-speed stirring and dispersion for 4 hours, a slurry with uniform filler distribution is obtained. Spray the mixed slurry on the surface of the surface-treated 1mm thick ceramic sheet with a spray gun, the spraying pressure is 0.3MPa-0.6MPa, and the distance between the nozzle and the sprayed object is 200-300mm; Under the state of 100 ℃ ~ 200 ℃, dry treatment for 1 ~ 2 hours, remove the solvent in the coating slurry, and make the precursor cross-linking reaction; pass through the nitrogen atmosphere, the material after the cross-linking reac...

Embodiment 3

[0034] At normal temperature and pressure, according to the components specified in Table 1 by weight, in 100 parts of polyborosilazane, the precursor of extremely low carbon ceramics, add heat-insulating fillers: 20 parts of quartz powder, hollow glass powder, One or more of the silica airgel powders are added simultaneously with 10 parts of silane coupling agent and 50 parts of aromatic hydrocarbon solvent to adjust the viscosity, and after high-speed stirring and dispersion for 4 hours, a slurry with uniform filler distribution is obtained. Brush the mixed slurry on the surface of the surface-treated 1mm thick ceramic sheet; dry the coated base material at 100°C-200°C for 1-2 hours in a vacuum state, and remove the coating slurry The solvent in the material, and the cross-linking reaction of the precursor; the nitrogen atmosphere was introduced, and the material after the cross-linking reaction was treated at 300 ° C for 5 hours, and then the temperature was naturally lowere...

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Abstract

The invention provides a preparation method of a semi-inorganic heat-insulating and wave-permeable coating material. The method includes: taking a very-low-carbon ceramic precursor as a base material, matching it with various heat-insulating fillers and various solvents and assistants, by weight, adding 10-50 parts of a heat-insulating filler composed of one or more of quartz powder, hollow glass powder, silica aerogel powder, 1-10 parts of a silane coupling agent and 10-100 parts of an aromatic solvent into 100 parts of the ceramic precursor with a very low C-H group content, and conducting high-speed stirring dispersion to obtain a precursor polymer slurry containing Si-H and N-H active groups, subjecting the coating equipped base material to a drying treatment at 100DEG C-200DEG C for 1-2h so as to make the precursor undergo a cross-linking reaction, performing a treatment at 300DEG C-500DEG C for 1-5h, then carrying out natural cooling, thus obtaining the semi-inorganic coating on the surface of the base material. The method provided in the invention has a simple process. The prepared coating has high temperature resistance, low thermal weight loss rate, good heat insulation performance and excellent wave permeability, and can be widely used in the electronics industry.

Description

technical field [0001] The invention relates to a method for preparing a coating material that can be used for heat insulation and wave penetration requirements of antennas, radomes, and wave-transmitting covers in the electronics and aerospace industries. Background technique [0002] When a high-speed aircraft flies at hypersonic speed in the atmosphere, it is strongly compressed and rubbed by the air, and most of the kinetic energy is converted into heat energy, which causes the temperature of the surrounding air to rise sharply, and the heat energy is quickly transferred to the surface of the aircraft. This phenomenon of heating due to the high-speed flight of objects in the atmosphere is called "aerodynamic heating". With the increase of the flight Mach number, the aerodynamic heating will become more serious, and the air temperature in the stagnation point area will increase proportional to the square of the Mach number. When the temperature exceeds 200°C, the aluminu...

Claims

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Application Information

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IPC IPC(8): C09D183/16C09D7/12C09D5/00B05D3/00
Inventor 敖辽辉曹峰
Owner 10TH RES INST OF CETC
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