High selectivity hygroscopic agent with shell and core structure and preparation method thereof

A highly selective, nuclear-structured technology, applied in separation methods, chemical instruments and methods, other chemical processes, etc., can solve the problems of low hygroscopic capacity, small adsorption capacity, poor selectivity, etc., and achieve low cost, high hygroscopic capacity, Highly selective effect

Inactive Publication Date: 2009-03-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the molecular sieve series has good selectivity, if the choice of 3 Molecular sieve dehumidification can avoid the co-adsorption problem of silica gel and alumina series, but the adsorption capacity is small and the cost is high
[0004]Therefore, there is an urgent need for a highly selective hygroscopic agent preparation method to meet the needs of air-conditioning dehumidification systems, and to solve the poor selectivity or low hygroscopic capacity of existing hygroscopic agents The problem

Method used

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  • High selectivity hygroscopic agent with shell and core structure and preparation method thereof
  • High selectivity hygroscopic agent with shell and core structure and preparation method thereof
  • High selectivity hygroscopic agent with shell and core structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Activate 10g of 100-200 mesh silica gel in 150mL of 5% (mass concentration) methanesulfonic acid aqueous solution at 100°C for 6h, then add to 200mL of 4% ethanol solution of 3-(methacryloyloxy)propyltrimethoxysilane , stirred and reacted at 30°C for 24h, the reaction mixture was filtered, washed with ethanol, and dried to obtain silica gel MA-SiO with double bonds on the surface 2 ;

[0027] The resulting MA-SiO 2 Add it to 200mL of 6% (mass concentration) aqueous solution of methacrylic acid, add 0.12g ammonium persulfate under stirring to initiate the polymerization reaction, react at 30°C for 20h, filter the reaction mixture, wash with ethanol, and obtain surface grafting after drying Polymer brushed silicone PMA-SiO 2 ;

[0028] The resulting PMA-SiO 2 Add ethylenediamine (0.3g, 5mmol) into a water-ethanol (volume ratio of water to ethanol: 9:1) solution, react for 6h under stirring at room temperature, filter, wash with water, wash with ethanol, and vacuum dry...

Embodiment 2

[0030] 10g of 100-200 mesh silica gel was activated in 200mL of 8% (mass concentration) methanesulfonic acid aqueous solution at 100°C for 10h, and then added to 200mL of 8% (mass concentration) of 3-(methacryloyloxy)propyltrimethoxy In the ethanol solution of silane, stir and react at 50°C for 18h, the reaction mixture is filtered, washed with ethanol, and dried to obtain the silica gel MA-SiO with double bonds on the surface 2 ; The resulting MA-SiO 2Add it to 200mL of 10% acrylic acid aqueous solution, add 0.2g potassium persulfate under stirring to initiate the polymerization reaction, react at 30°C for 15h, filter the reaction mixture, wash with ethanol, and dry to obtain the silica gel PMA with polymer brush on the surface -SiO 2 ; The resulting PMA-SiO 2 Add butanediamine (0.88g, 10mmol) into a water-ethanol (volume ratio of water to ethanol: 5:1) solution, react at room temperature for 10h, filter, wash with water / ethanol, and vacuum dry to obtain high Selective hyg...

Embodiment 3

[0032] Activate 5g of 100-200 mesh silica gel in 80mL of 3% (mass concentration) methanesulfonic acid aqueous solution at 100°C for 3h, then add to 100mL of 1% ethanol solution of 3-(methacryloyloxy)propyltrimethoxysilane , stirred and reacted at 70°C for 6h, and the reactant was filtered, washed with ethanol, and dried to obtain silica gel MA-SiO with double bonds on the surface 2 ; The resulting MA-SiO 2 Add it to 100mL of 2% acrylic acid-hydroxyethyl methacrylate (the mass ratio of acrylic acid to hydroxyethyl methacrylate is 3:1), and add 0.004g ammonium persulfate under stirring to initiate the polymerization reaction. After reacting for 5h, the resulting solid was filtered, washed with ethanol, and dried to obtain the silica gel PMA-SiO with surface grafted polymer brushes. 2 ; The resulting PMA-SiO 2 Add ethylenediamine (0.03g, 0.5mmol) into a water-ethanol (volume ratio of water to ethanol: 10:1) solution, react at room temperature for 4h, filter, wash with water / eth...

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Abstract

The invention discloses a high selectivity moisture absorber with a shell-core structure and a method for preparing the same. The moisture absorber is an organic-inorganic composite adsorbent which takes an inorganic porous material the surface of which contains a hydroxyl group as an inner core and a hydrophilic polymer ultra-thin film as a shell, wherein by the condensation and polymerization reactions, the shell is grafted with a hydrophilic polymer brush on the surface of the inner core; and further by the cross linking, the hydrophilic polymer ultra-thin film shell is formed. The preparation method comprises the following steps: firstly, the inorganic porous material the surface of which contains the hydroxyl group is subjected to activating treatment and then subjected to hydrolytic condensation with a silane coupler to form an inorganic porous material containing vinyl; and the inorganic porous material containing the vinyl is subjected to free radical polymerization reaction with an acrylic monomer and then is subjected to cross linking reaction with a diamine compound so as to obtain the high selectivity moisture absorber with the shell-core structure. Compared with prior art, the moisture absorber has the advantages of high selectivity, large hygroscopic capacity, simple preparation process, low cost and easy control of selectivity, and can meet the requirements of different application occasions.

Description

technical field [0001] The invention relates to a hygroscopic agent and a preparation method thereof, in particular to a preparation method of a highly selective hygroscopic agent with a shell-core structure, which is suitable for an air-conditioning dehumidification system. Background technique [0002] In the current situation of energy shortage and increasingly serious environmental pollution, solid adsorption dehumidification air-conditioning system has become an air treatment process developed by domestic and foreign competitors due to its unique advantages such as no pollution and low-grade energy. Solid adsorption dehumidification is the process of using a hygroscopic agent to absorb moisture in the air, and its core is a hygroscopic agent. Therefore, the development of high-efficiency adsorbents for air-conditioning dehumidification systems is the key to accelerating the commercialization of dehumidification air-conditioning systems and improving their competitivenes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08J3/24C08L51/10C08K5/17B01D53/28B01J20/26
Inventor 裴丽霞张立志张莉
Owner SOUTH CHINA UNIV OF TECH
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