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Selective infrared absorbing material based on ionic liquid and its preparing process

An ionic liquid and infrared absorption technology, applied in chemical instruments and methods, and other chemical processes, can solve problems such as poor compatibility, and achieve the effects of good fluidity, wide application range, and wide liquid use range

Inactive Publication Date: 2008-08-13
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, current research mainly focuses on solid infrared absorbing materials, which have problems such as poor compatibility with conventional solvents, which limit their application.

Method used

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  • Selective infrared absorbing material based on ionic liquid and its preparing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 1-methyl-3-octyl imidazolium tetrafluoroborate [C 8 MIm]BF 4 Preparation of ionic liquids

[0031] 22 g BF 4 - The corresponding salt sodium tetrafluoroborate is dissolved in 50 milliliters of cosolvent distilled water, is mixed with the salt solution that mass concentration is 50%, this salt solution is mixed with 46 grams [C 8 MIm]Cl mixed and reacted at 70°C for 5 hours. The mixed solution was cooled and filtered, and the precipitate was filtered to obtain the filtrate. After the filtrate was evaporated to remove the solvent, it was filtered again. The filtrate was extracted with the extractant dichloromethane (3 × 30 ml), the organic phases were combined, and the extractant in the organic phase was evaporated under reduced pressure. , the filtrate was dried with anhydrous sodium sulfate, and finally obtained light yellow transparent [C 8 MIm]BF 4 ionic liquid.

Embodiment 2

[0032] Example 2 1-methyl-3-octylimidazole hexafluorophosphate [C 8 MIm]PF 6 Preparation of ionic liquids

[0033] 22 g PF 6 - The corresponding salt sodium hexafluorophosphate is dissolved in 50 milliliters of cosolvent distilled water, is mixed with the salt solution that mass concentration is 50%, this salt solution is mixed with 46 grams [C 8 MIm]Cl mixed and reacted at 70°C for 24 hours. The mixed solution was cooled and filtered, and the precipitate was filtered to obtain the filtrate. After the filtrate was evaporated to remove the solvent, it was filtered again. The filtrate was extracted with the extractant dichloromethane (3 × 30 ml), the organic phases were combined, and the extractant in the organic phase was evaporated under reduced pressure. , the filtrate was dried with anhydrous sodium sulfate, and finally obtained light yellow transparent [C 8 MIm]PF 6 ionic liquid.

Embodiment 3

[0034] Example 3 1-methyl-3-octyl imidazole thiocyanate [C 8 Preparation of MIm]SCN Ionic Liquid

[0035] 31 g SCN - The corresponding salt potassium rhodanide is dissolved in 50 milliliters of cosolvent acetone, is mixed with the salt solution that mass concentration is 50%, this salt is dissolved in 50 grams [C 8 MIm]Cl mixed and reacted at 60°C for 24 hours. The mixed solution was cooled and filtered, and the precipitate was filtered to obtain the filtrate. After the filtrate was evaporated to remove the solvent, it was filtered again. The filtrate was extracted with the extractant dichloromethane (3 × 30 ml), the organic phases were combined, and the extractant in the organic phase was evaporated under reduced pressure. , the filtrate was dried with anhydrous sodium sulfate, and finally obtained light yellow transparent [C 8 MIm]SCN ionic liquid.

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Abstract

The invention relates to an ionic liquid-based infrared absorbing material composed of one or several of ionic liquid provided with [A<+>B<->] structure and preparation method thereof. According to adjustable properties of composition and structure of ionic liquid negative ion, ionic liquid with different physicochemical properties can be synthesized by changing types of positive and negative ion. Material with good selecting infrared absorbing property and adjustable wide liquid range of infrared absorbing range can be prepared by mixing treatment in proportion according to different concentrations. The ionic liquid-based selecting infrared absorbing material is provided with strong infrared absorption at part of near infrared, medium infrared and part of far infrared regions, high heat stability stable at 400 deg C, wide liquid range and low viscosity. The preparation method of the invention has simple technique, low investment on apparatus, low energy consumption, no environmental pollution, and wide scope of application.

Description

technical field [0001] The invention relates to an ionic liquid-based selective infrared absorbing material and a preparation method. Background technique [0002] Since F.W. Herschel discovered infrared radiation in 1800, infrared technology has been greatly developed, and has now played an important role in the fields of modern technology, national defense, industry and agriculture, such as infrared detectors on satellites, by detecting Human body heat for infrared imaging night vision device, infrared physiotherapy device using far infrared thermal effect therapy, heat-seeking missile technology of American Sidewinder and infrared burning appliances, etc. [0003] The key to the development of infrared technology lies in the development of infrared materials. Infrared absorbing material is an optical medium that can absorb infrared rays. It has low emissivity and solar absorption rate, which can effectively reduce the infrared radiation energy and surface temperature of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
Inventor 陈继刘郁邓岳峰孙晓琦
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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