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Preparation method of hydrophobic chromic oxide

A technology of chromium trioxide and hydrophobicity, which is applied in the direction of dyeing method, dyeing organic silicon compound treatment, dyeing low molecular organic compound treatment, etc., can solve the problems of non-chromium trioxide hydrophobic modification and relatively few researches, etc. Achieve better coloring effect, improved application, enhanced binding force

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

Superhydrophobic membranes, superhydrophobic surfaces, superhydrophobic coatings and their preparation methods are frequently mentioned in many well-known literatures, but there are relatively few studies on making the powder itself superhydrophobic
At present, there are few studies on the hydrophobic modification of chromium trioxide, and there is no patent report on the hydrophobic modification of chromium trioxide. Therefore, the hydrophobic modification of chromium trioxide is of great importance to broaden its application range in other fields significance

Method used

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  • Preparation method of hydrophobic chromic oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of hydrophobic chromium trioxide, adding 50g of chromium trioxide and 100g of acetone 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 80°C , quickly added 1.0g stearic acid, stirred and reacted for 40 minutes, suction filtered, dried, pulverized, and ground to obtain modified chromium trioxide powder, the activation index of the modified chromium sesquioxide>99%, and the contact angle was The original 32° is increased to 145°, and the chromium trioxide changes from hydrophilicity to hydrophobicity. The obtained hydrophobic chromium oxide was placed in a constant temperature and humidity box (temperature: 25°C, humidity: 80%), and after 30 days, its moisture absorption rate was only 0.1% (18% before modification), and its waterproof performance was improved. Greatly improve. After modification, the polarity of chromium trioxide parti...

Embodiment 2

[0021] A kind of preparation method of hydrophobic chromium trioxide, 50g dichromium trioxide and 100g dehydrated alcohol are added in the there-necked flask of 250mL, then there-necked flask is placed in constant temperature water bath, reflux condensing device is installed, then heated to 90°C, quickly add 1.0g of lauric acid, stir and react for 30min, filter with suction, dry, pulverize, and grind to obtain modified chromium trioxide powder. The activation index of the modified chromium trioxide is >98%, and the contact angle From 32° to 143°, the modified chromium oxide has stronger hydrophobicity. Infrared spectrum research shows that the modified sample is at 1701cm -1 The characteristic absorption peak of the C=O bond in the carboxyl group of lauric acid-COOH disappears at 1639cm -1 The laurate carboxylate anion (CH 3 (CH 2 ) 10 COO-) C=O bond absorption peak at 2923cm -1 and 2853cm -1 CH 3 and CH 2 The characteristic peaks of organic groups such as lauric acid ...

Embodiment 3

[0023] A preparation method of hydrophobic chromium trioxide, 50g of chromium trioxide and 100g of absolute ethanol are added to a 250mL three-necked flask, then the three-necked flask is placed in a constant temperature oil bath, equipped with a reflux condensing device, and then heated To 120°C, quickly add 1.0g of aluminate, stir and react for 30min, filter with suction, dry, pulverize and grind to obtain modified chromium oxide powder, the activation index of the modified chromium oxide is >99%, The contact angle is increased from 32° to 159°, effectively obtaining hydrophobic chromium trioxide powder. Infrared spectrum research shows that the modified sample is at 2919cm -1 and 2851cm -1 CH 3 and CH 2 The characteristic peaks of organic groups, which indicate that the organic matter has been successfully connected to the surface of chromium trioxide particles, and the aluminate coupling agent is chemically bonded on the surface of chromium trioxide to form new chemical...

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Abstract

The invention discloses a preparation method of hydrophobic chromic oxide and the preparation method is characterized by comprising the following steps of: taking chromic oxide, taking a solvent which accounts for 50-200% of the weight of chromic oxide, taking a hydrophobic modifier which accounts for 0.5-20% of the weight of chromic oxide, mixing chromic oxide, the solvent and the hydrophobic modifier, stirring and reacting at 50-150 DEG C for 10-120 min, followed by pumping filtration, and drying the solid to prepare the hydrophobic chromic oxide. According to the invention, the raw materials are easily available; the production technology is easy to carry out; and the modified chromic oxide prepared can be used as a filling material of rubber and resin based composite materials or paints, a coloring agent for artificial leather and a special printing ink for printing bank note. The preparation method has a wide application prospect.

Description

technical field [0001] The invention belongs to a preparation method of a modified chromium compound, and relates to a preparation method of hydrophobic chromium trioxide. The hydrophobic chromium trioxide prepared by the invention is especially suitable for filling materials of rubber, resin-based composite materials or coatings, colorants of artificial leather, and special inks for printing banknotes. Background technique [0002] Chromium trioxide, also known as chromium oxide green, has the advantages of corrosion resistance, light resistance, wear resistance, high temperature resistance, chemical resistance, etc. It can be widely used as a filling modification material in industries such as rubber, resin-based composite materials or coatings. Improve the mechanical properties and heat resistance of composite materials, and reduce the cost of products. However, since the surface of chromium trioxide is hydrophilic and oleophobic, the polarity difference between the surf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/34C09C3/08C09C3/12C08K9/10C08K9/04C08K9/06C08K3/22C09D7/12C09D11/02D06P1/673C09J11/04
Inventor 霍冀川罗爽雷永林
Owner SOUTHWEAT UNIV OF SCI & TECH
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