Boron and silicon-containing asphalt and preparation method thereof

A technology of pitch and borosilicate, applied in the field of borosilicate pitch and its preparation, can solve the problems of limited application scope, cannot be used as a binder and impregnant, etc., and achieves the effects of simple operation, easy availability of raw materials and low reaction temperature

Inactive Publication Date: 2010-09-29
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the product borosilicate ceramic alloy does not melt after heating, it cannot be used as a bonding agent and impregnating agent, which limits its application range.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A borosilicate pitch and a preparation method thereof. Dissolve coal tar pitch in toluene, keep warm at 40-50°C for 4-6 hours, centrifuge and filter to remove insoluble matter, distill the solution at 110-130°C to remove toluene, and dry the residue to produce Obtain asphalt toluene solubles; then mix 1-3wt% pyridine borane, 30-40wt% polycarbosilane and 57-69wt% asphalt-toluene solubles, add 50-60wt% pyridine of the above-mentioned mixture, stir homogeneous; then keep warm at 110-120°C for 2-4 hours, distill and remove pyridine at 80-90°C to obtain the synthesized product; finally keep the synthesized product at 130-140°C for 24 hours to obtain borosilicate asphalt.

[0013] The 900°C carbonization product of the borosilicate pitch prepared in Example 1 was kept at a constant temperature in an air environment of 1100-1200°C for 24 hours, and its weight loss rate was 0.95-0.98%.

Embodiment 2

[0015] A borosilicate pitch and a preparation method thereof. Dissolve coal tar pitch in toluene, keep it warm at 45-70°C for 5-8 hours, centrifuge and filter to remove insoluble matter, distill the solution at 130-150°C to remove toluene, and dry the residue to produce Obtain asphalt toluene solubles; then mix 3-5wt% pyridineborane, 35-55wt% polycarbosilane and 40-62wt% asphalt-toluene solubles, add 60-80wt% toluene of the above-mentioned mixture, stir homogeneous; then keep warm at 140-200°C for 3-6 hours, distill and remove toluene at 85-110°C to obtain the synthesized product; finally keep the synthesized product at 140-160°C for 24 hours to obtain borosilicate asphalt.

[0016] The 900°C carbonization product of the borosilicate pitch prepared in Example 2 was kept at a constant temperature in an air environment of 1100-1200°C for 24 hours, and its weight loss rate was 0.90-0.95%.

Embodiment 3

[0018] A borosilicate pitch and a preparation method thereof. Dissolve coal tar pitch in toluene, keep it warm at 60-90°C for 7-10 hours, centrifuge and filter to remove insoluble matter, distill the solution at 110-120°C to remove toluene, and dry the residue to produce Obtain asphalt toluene solubles; then mix 5-10wt% pyridine borane, 30-60wt% polycarbosilane and 50-60wt% asphalt toluene solubles, add 70-80wt% toluene of the above-mentioned mixture, stir Uniform; then keep warm at 200-300°C for 6-10 hours, distill and remove toluene at 100-120°C to obtain the synthesized product; finally synthesize the product at 150-180°C for 24 hours to obtain boron Silicon asphalt.

[0019] The 900°C carbonization product of the borosilicate pitch prepared in Example 3 was kept at a constant temperature in an air environment of 1100-1200°C for 24 hours, and its weight loss rate was 0.85-0.92%.

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PUM

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Abstract

The invention relates to boron and silicon-containing asphalt and a preparation method thereof. The invention adopts a technical scheme that: the preparation method comprises the followings steps of: dissolving asphalt in toluene, keeping the temperature of between 40 and 90 DEG C for 4 to 10 hours, centrifuging and filtering to remove undissolved substances, distilling the solution at the temperature of between 110 and 150 DEG C to remove the toluene, and drying the residue to prepare an asphalt and toluene soluble substance; mixing 1 to 10 weight percent of organic boron, 30 to 60 weight percent of organic silicon and 30 to 69 weight percent of asphalt and toluene soluble substance, adding a solvent accounting for 50 to 80 weight percent of the mixture, and uniformly stirring; keeping the temperature of between 100 and 300 DEG C for 2 to 10 hours, and distilling at the temperature of between 80 and 120 DEG C to remove the solvent to obtain the synthesized product; and keeping the temperature of the synthesized product at the temperature of between 130 and 180 DEG C for 24 hours to obtain the boron and silicon-containing asphalt. The boron and silicon-containing asphalt has the characteristics of readily available raw materials, low reaction temperature and simple operation, and can be used as a binding agent and an impregnant; and carbonized products after high temperature treatment have good oxidation resistance at a high temperature.

Description

technical field [0001] The invention belongs to the technical field of asphalt, and in particular relates to a borosilicate asphalt and a preparation method thereof. Background technique [0002] At room temperature, pitch is a black solid with no fixed melting point and a glass phase, which softens and then melts after being heated. Because pitch can be used as a binder and impregnating agent for carbon / carbon composite materials and other composite materials, its products are increasingly widely used in the fields of metallurgy, chemical industry, aerospace and electronics. However, pitch and pitch-based carbon materials are easily oxidized in air or in an oxidizing environment, so their operating temperature is often lower than 400°C. With the improvement of environmental requirements for materials, the development of carbon materials that can be used in high-temperature and ultra-high-temperature environments, so that the modified asphalt has oxidation resistance after ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C3/02
Inventor 李轩科左小华董志军袁观明
Owner WUHAN UNIV OF SCI & TECH
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