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Preparation method of modified chrome-aluminum phosphate

A chromium-aluminum phosphate modification technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as unstable dielectric properties of materials, deterioration of wave-transmitting performance of radome, shortening of radar action distance, etc., to achieve Active chemical properties, reduce moisture absorption, improve the effect of adhesion

Inactive Publication Date: 2013-08-21
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The matrix materials of phosphate-based wave-transparent composite materials such as chromium aluminum phosphate obtained by the prior art generally have strong moisture absorption and low tensile shear strength, and the dielectric constant of the radome material will be reduced after moisture absorption. As the dielectric loss tangent increases, the wave penetration performance of the radome deteriorates, which greatly shortens the radar range and increases the aiming error; and with the change of ambient temperature and humidity, the moisture absorption rate of the material will also change, resulting in material dielectric loss. The electrical performance is unstable, it is difficult to meet the requirements of use, and the practicability is poor

Method used

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  • Preparation method of modified chrome-aluminum phosphate
  • Preparation method of modified chrome-aluminum phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A preparation method of modified chromium aluminum phosphate: add 57.98g of phosphoric acid aqueous solution with a mass percentage concentration of 65% in a 500ml three-neck flask equipped with a booster stirrer and a condensation reflux device, then add 10.0g of aluminum hydroxide, Stir at 80°C for 25 minutes, then add 4.27g of chromium oxide, stir and react to an orange transparent solution; adjust the temperature to about 140°C and add 1.39g of modifier lanthanum oxide, react for half an hour, then slowly add methanol 3.0 g, until the oxidation-reduction reaction is completed, keep it warm for 60 minutes, and synthesize a green viscous liquid rare earth chromium aluminum phosphate binder, which is to obtain a modified chromium aluminum phosphate.

[0015] Put the same amount of modified chromium aluminum phosphate and unmodified chromium aluminum phosphate in a constant temperature and humidity environment (parameters are 25°C, 80%RH), record the change of their weig...

Embodiment 2

[0019] A preparation method of modified chromium aluminum phosphate is: add 57.98 g of phosphoric acid aqueous solution with a mass percentage concentration of 65% in a 500 ml three-necked flask equipped with a booster stirrer and a condensing reflux device, and then add 10.0 g of aluminum hydroxide, Stir at 80°C for 30 minutes, then add 4.27g of chromium oxide, stir and react to an orange transparent solution; adjust the temperature to about 90°C, add 2.35g of modifier cerium oxide, react for half an hour, then slowly add methanol 3.0 g, until the oxidation-reduction reaction is completed, keep it warm for 90 minutes, and synthesize a green viscous liquid rare earth chromium aluminum phosphate binder, which is to obtain a modified chromium aluminum phosphate.

[0020] Put the same amount of modified chromium aluminum phosphate and unmodified chromium aluminum phosphate in a constant temperature and humidity environment (parameters are 25°C, 80%RH), record the change of their w...

Embodiment 3～6

[0023] A preparation method of modified chromium aluminum phosphate, comprising the following steps: adding 57.98 g of phosphoric acid aqueous solution with a mass percent concentration of 65% in a 500 ml three-necked flask equipped with a booster stirrer and a condensation reflux device, and then adding 10.0 g of aluminum hydroxide g, at 80°C, stir for 20-40min, then add 4.27g of chromium oxide, stir and react until orange transparent solution; adjust the temperature to 90-140°C, add modifier, react for half an hour, then slowly add methanol dropwise 3.0~5.0g, until the oxidation-reduction reaction finishes, keep warm for 60~90min, synthesize green viscous liquid rare earth chromium aluminum phosphate adhesive, promptly make modified chromium aluminum phosphate; The following table:

[0024]

[0025] In the table: the data "4.0" of "modifier" under "embodiment number" is "3" means "taking the quality of modifier as 4.0g", and so on. The modifier is lanthanum oxide or ceri...

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Abstract

The invention discloses a preparation method of modified chrome-aluminum phosphate. The preparation method comprises the following steps of: adding 40-50 parts by mass of phosphoric acid with the concentration of 60-80 percent and 8-15 parts by mass of aluminum hydroxide into a reactor to react for 25-50 minutes at a temperature of 60-130 DEG C, and then adding 4-11 parts by mass of chromium oxide to react for 30-45 minutes; and then adjusting the temperature to 90-170 DEG C, adding 1-4 parts by mass of lanthanum oxide as a modifier to react for 15-35 minutes, and then adding 2-6 parts by mass of methanol to react for 40-80 minutes to obtain modified chrome-aluminum phosphate. The preparation method disclosed by the invention is mild in preparation condition, simple in process and convenient to operate; and modified chrome-aluminum phosphate prepared by using the preparation method has lower moisture absorbability and excellent mechanical property, so that the application scope of a chrome-aluminum phosphate-based wave-transmitting material is wider.

Description

technical field [0001] The invention belongs to the preparation of two or more metal phosphates used for wave-transparent composite materials, and relates to a preparation method of modified chromium aluminum phosphate. The modified chromium aluminum phosphate prepared by the invention is especially suitable for the matrix material of the wave-transmitting composite material. Background technique [0002] Chromium aluminum phosphate is a matrix material for wave-transparent composite materials with excellent performance. It has the characteristics of high strength, high temperature resistance, thermal stability, excellent dielectric properties, oxidation resistance, good structural designability, and small thermal expansion coefficient. Combining the advantages of metal and ceramics, it is an ideal material for high temperature resistance and low dielectric loss, and can be used as an advanced wave-transmitting material for various rockets, missiles and space shuttles. This...

Claims

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Application Information

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IPC IPC(8): C01B25/45
Inventor 霍冀川崔韶丽陈宁
Owner SOUTHWEAT UNIV OF SCI & TECH
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