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Phosphate-silicon dioxide low-dielectric high temperature-resistant coating and preparation thereof

A high-temperature-resistant coating and silicon dioxide technology, applied in the direction of fire-resistant coatings, coatings, etc., can solve the problems of high brittleness and easy falling off, and achieve the effect of improving flexibility, low dielectric constant, and low dielectric loss

Inactive Publication Date: 2008-10-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to provide a water-soluble phosphate high-temperature-resistant coating and its preparation method. The coating formed by the coating of the present invention can be cured at room temperature and heated, and can effectively improve the flexibility and smoothness of the inorganic coating. Poor and brittle, easy to fall off defects of the prior art

Method used

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  • Phosphate-silicon dioxide low-dielectric high temperature-resistant coating and preparation thereof
  • Phosphate-silicon dioxide low-dielectric high temperature-resistant coating and preparation thereof
  • Phosphate-silicon dioxide low-dielectric high temperature-resistant coating and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of acidic aluminum phosphate binder:

[0038] Weigh 1153g of phosphoric acid with a concentration of 85%, add water to 1960g, and dilute the concentration of phosphoric acid to 50%; heat phosphoric acid to 90°C; weigh Al(OH) 3 Slowly add 400g into phosphoric acid and keep stirring; heat up to 98°C and stir for 3 hours to react, after cooling, an acidic aluminum phosphate binder is prepared, and finally water is added to adjust the mass concentration of acidic aluminum phosphate to 35%.

[0039] Prepare the paint according to the following formula:

[0040] The acid aluminum phosphate binding agent 660g that above-mentioned steps prepares

[0041] 5μm fused silica powder 150g

[0042] 600 mesh refined quartz powder 150g

[0043] Fumed silica 27g

[0044] Magnesium oxide 8g

[0045] oπ-10 5g

[0046] According to the above formula, first add surfactant oπ-10, 5μm fused silica powder and 600 mesh refined quartz powder to the composite binder and ball mill...

Embodiment 2

[0051] Preparation of acidic aluminum phosphate binder:

[0052] Weigh 1153g of phosphoric acid with a concentration of 85%, add water to 1960g, and dilute the concentration of phosphoric acid to 50%; heat phosphoric acid to 98°C; weigh Al(OH) 3 Slowly add 400g into phosphoric acid and keep stirring; move the above reactants into an autoclave and raise the temperature to 150°C and stir for 1 hour. After cooling, an acidic aluminum phosphate binder is obtained. Finally, add water to adjust the mass concentration of acidic aluminum phosphate to 35%.

[0053] Take 600 g of the acidic aluminum phosphate binder prepared above, add 160 g of 20% acidic stable silica sol, and reflux at 50° C. for 2 hours to obtain a composite inorganic binder.

[0054] Prepare the paint according to the following formula:

[0055] The acid aluminum phosphate binding agent 600g that above-mentioned steps prepares

[0056] 2μ fused silica powder 200g

[0057] 400 mesh refined quartz powder 140g

[0...

Embodiment 3

[0066] Preparation of aluminum chromium phosphate binder:

[0067] Weigh 1499g of 85% phosphoric acid solution, 1200g of water, and CrO 3 109g, added together to the reactor at 70°C for 15min, stirring constantly; then weighed Al(OH) 3 333g was added to the above solution, and the temperature was raised to 100°C. After reacting for 0.5 hours, the temperature was lowered to 80°C, and 10g of paraformaldehyde was added to the mixture. After 5min, the temperature was raised to 95°C, and the water bath was 20min. After cooling, add water to adjust to a concentration of 30% acid aluminum chromium phosphate binder.

[0068] Take 600 g of the acidic aluminum chromium phosphate binder prepared above, add 200 g of 30% acidic stable silica sol, and reflux at 30° C. for 2 hours to obtain a composite inorganic binder.

[0069] Prepare the paint according to the following formula:

[0070] The composite inorganic binder 720g that above-mentioned steps prepares

[0071] 5μm fused quart...

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Abstract

The invention discloses a low-dielectric high-temperature-resistant phosphate-silicon dioxide coating, with the mass percentage content between the components and the raw material as follows: 50-80% of percentage content of inorganic compound binder, 15-50% of high-temperature filler, 0.5-1.5 wt% of curing agent, 2-5 wt% of thickener, and 0.3-1.5wt% of surfactant; the inorganic compound binder is the mixture of aluminum phosphate or aluminium-chromium phosphate and silicon collosol; the high-temperature resistant filler is the mixture of fused quartz powder and refined quartz powder or alpha-Al2O3 power; the curing agent is MgO; the thickener is fumed silica; the surfactant is non-ionic surfactant. The phosphate binder is firstly prepared, followed by phosphate / silicon collosol compound binder; then the non-ionic surfactant and the high-temperature resistant filler are added to the compound binder, followed by the thickener and the curing agent, then the mixture is evenly mixed. The invention can be used for the surface protection of porous inorganic materials or non-porous inorganic materials and is typically used as wave-transparent material for aerospace crafts.

Description

technical field [0001] The invention relates to a high temperature resistant coating, in particular to a phosphate-silicon dioxide high temperature resistant coating and a preparation method thereof. Background technique [0002] As a high temperature protective coating, phosphate coating materials are mainly composed of high temperature resistant binder (aluminum phosphate based binder), high temperature resistant filler (alumina, chromium oxide, silicon oxide and silicon carbide, etc.) and other additives. [0003] Phosphate-based inorganic coatings prepared with acid phosphate aqueous solution as film-forming material, pigments, fillers and curing agents have good high temperature resistance, abrasion resistance, oxidation resistance and bonding performance. At present, phosphate coatings are mainly used for heat-resistant protective coatings of metals and alloys and anti-corrosion coatings prepared by adding metal particles. As a kind of inorganic coating, it has become...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D5/18
Inventor 李晓雷梁辉
Owner TIANJIN UNIV
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