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Preparation method of hydrophobic aluminum chromium phosphate

A chromium-aluminum phosphate and hydrophobic technology, which is applied in the direction of fibrous filler, dyed organic silicon compound treatment, coating, etc., can solve the problems of affecting the wave transmission performance and mechanical properties of materials, reducing the actual application effect, and the decline of material mechanical properties. , to achieve the effect of enhanced binding force, easy operation and improved waterproof performance

Inactive Publication Date: 2012-06-27
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the prior art still has the following disadvantages: the surface polarity of chromium aluminum phosphate is strong, and it is easy to agglomerate to form larger aggregates with several weakly connected interfaces, which greatly reduces or even eliminates the practical application effect of its particles; The surface of chrome-aluminum particles is hydrophilic and oleophobic, and it is difficult to disperse uniformly in the organic polymer resin, and voids will appear on the interface. When moisture in the air enters the voids, it will cause degradation and embrittlement of the polymer at the interface, resulting in a decline in the mechanical properties of the material; When chromium aluminum phosphate is applied to high-temperature wave-transparent materials, after hot pressing, due to the high polarity of the surface of chromium aluminum phosphate, it is easy to absorb moisture in the air (the dielectric constant of water is 78.36F / m), which affects the material’s wave transmission performance and mechanical properties

Method used

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  • Preparation method of hydrophobic aluminum chromium phosphate

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Effect test

Embodiment 1

[0019] A preparation method of hydrophobic chromium aluminum phosphate, adding 50g of chromium aluminum phosphate calcined at 200°C into a 250ml three-necked flask, then placing the three-necked flask in a constant temperature oil bath, installing a reflux condensing device, and then heating to 100°C , quickly added 1.0g of methyltriethoxysilane, stirred and reacted for 20min, took out the sample and dried it to obtain modified chromium aluminum phosphate powder, the activation index of the modified chromium aluminum phosphate was >99%, and when mixed with water droplets (3ml) The contact angle increased from 27° before modification to 129°, and changed from hydrophilic and oleophobic to hydrophobic and oleophilic, and its moisture absorption rate (30 days, 25°C, 80% humidity) decreased from 10% to 0.8%, and the moisture resistance performance was improved. Greatly improve. Infrared spectrum research shows that the infrared spectrum of the sample before and after modification ...

Embodiment 2

[0021] A method for preparing hydrophobic chromium aluminum phosphate, adding 50g of chromium aluminum phosphate calcined at 400°C into a 250ml three-necked flask, then placing the three-necked flask in a constant temperature water bath, installing a reflux condensing device, and then heating to 70°C, Quickly add 1.0g of methyltriethoxysilane, stir and react for 30 minutes, take out the sample and dry it to obtain modified chromium aluminum phosphate powder, the activation index of the modified chromium aluminum phosphate is >99%, and the contact angle is changed from the original 27 ° increased to 144 °, the prepared chromium aluminum phosphate has strong hydrophobicity. Infrared spectrum research shows that the infrared spectrum of the sample before and after modification has not changed significantly, indicating that there is no chemical bonding between methyltriethoxysilane and the groups on the surface of chromium aluminum phosphate to form new chemical bonds, but through ...

Embodiment 3

[0023] A method for preparing hydrophobic chromium-aluminum phosphate, comprising the following steps: taking chromium-aluminum phosphate and a modifier of 0.5% by weight of chromium-aluminum phosphate, mixing the chromium-aluminum phosphate with the modifier, and stirring and reacting at a temperature of 50°C ( Coating) for 120min, the hydrophobic chromium aluminum phosphate (or modified chromium aluminum phosphate) was obtained.

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Abstract

The invention discloses a preparation method of hydrophobic aluminum chromium phosphate. The preparation method is characterized in that the preparation method comprises the following steps: 1, taking aluminum chromium phosphate, and taking a modifier with the weight accounting for 0.5-20% of the aluminum chromium phosphate; and 2, mixing the aluminum chromium phosphate with the modifier, and stir-reacting for 10-120min at 50-150DEG C to obtain the hydrophobic aluminum chromium phosphate, wherein the modifier is methyltriethoxysilane. By adopting the preparation method, raw materials are easy to obtain, the production technology is easy to carry out, and the prepared hydrophobic aluminum chromium phosphate is specially suitable for being used as a filler of a resin matrix composite material or a paint and has a wide application prospect.

Description

technical field [0001] The invention belongs to a preparation method of surface-modified chromium aluminum phosphate, and relates to a preparation method of hydrophobic chromium aluminum phosphate. The hydrophobic chromium-aluminum phosphate prepared by the invention is particularly suitable as a filler for resin-based composite materials or coatings. Background technique [0002] Chromium aluminum phosphate is a double salt of aluminum phosphate, chromium phosphate and phosphoric acid, composed of P 2 o 5 、Al 2 o 3 、Cr 2 o 3 、H 2 The viscous solution composed of O gradually dehydrates and solidifies as the temperature rises, loses the bound water of phosphoric acid, and forms P 2 o 5 -Al 2 o 3 -Cr 2 o 3 The compound melts at slightly lower than 1800°C and does not decompose, and the trivalent chromium contained does not oxidize. It has stable chemical properties, high viscosity, good plasticity, and especially good thermal stability. [0003] In the prior art, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/40C09C3/12C08K9/06C08K3/32C09D7/12
Inventor 霍冀川罗爽雷永林
Owner SOUTHWEAT UNIV OF SCI & TECH
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