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Preparation method of nano-SiO2/cellulose composite separating membranes

A technology of cellulose and separation membrane, which is applied in the direction of semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of uneven dispersion of matrix materials, unsatisfactory modification effect, and high chemical reactivity, etc., to achieve The internal structure is evenly distributed, the effect of improving the strength and uniformity of the film, and improving the mechanical properties

Active Publication Date: 2013-06-26
OLANSI HEALTHCARE CO LTD
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  • Description
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Problems solved by technology

nano-SiO 2 It has the characteristics of many surface defects, small particle size, high purity, large specific surface, high surface energy, and high chemical reactivity, so a single nano-SiO 2 Particles are prone to agglomeration when they are in contact with each other, and the dispersion in the matrix material is not uniform, and the modification effect is not ideal

Method used

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  • Preparation method of nano-SiO2/cellulose composite separating membranes
  • Preparation method of nano-SiO2/cellulose composite separating membranes
  • Preparation method of nano-SiO2/cellulose composite separating membranes

Examples

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Embodiment 1

[0037] The nano-SiO of this embodiment 2 A preparation method for a cellulose composite separation membrane, comprising the following steps:

[0038] (1) Dissolving cellulose in ionic liquid to form casting solution: mix fully dried cotton pulp with ionic liquid 1-ethyl-3-methylimidazole acetate, dissolve at 90°C for 2 hours, and prepare into a casting solution with a mass fraction of 4%.

[0039] (2) Preparation of nano-SiO 2: Thoroughly mix tetraethyl orthosilicate and ethanol at a volume ratio of 1:25 to obtain a reaction solution; add ammonia water with a concentration of 25% to the reaction solution, stir at room temperature for 1min, and then stir at 60°C for 20h transparent SiO 2 Gel solution; the volume of the reaction solution is 4% of the volume of ammonia water; the obtained gel solution is heated and evaporated to obtain a gel, and dried at 80°C for 20h to obtain white nano-SiO 2 powder.

[0040] (3) Using silane coupling agent γ-(2,3-epoxypropoxy)propyltrimet...

Embodiment 2

[0052] The nano-SiO of this embodiment 2 A preparation method for a cellulose composite separation membrane, comprising the following steps:

[0053] (1) Dissolving cellulose in ionic liquid to form casting solution: mix fully dried cotton pulp with ionic liquid 1-ethyl-3-methylimidazole acetate, dissolve at 80°C for 2 hours, and prepare into a casting solution with a mass fraction of 3%.

[0054] (2) Preparation of nano-SiO 2 : Thoroughly mix tetraethyl orthosilicate and ethanol at a volume ratio of 1:50 to obtain a reaction solution; add ammonia water with a concentration of 30% to the reaction solution, stir at room temperature for 1min, and then stir at 75°C for 25h transparent SiO 2 Gel solution; the volume of the reaction solution is 9.3% of the volume of ammonia water; the obtained gel solution is heated and evaporated to obtain a gel, and dried at 100°C for 25 hours to obtain white nano-SiO 2 powder.

[0055] (3) Using silane coupling agent γ-(2,3-epoxypropoxy)pro...

Embodiment 3

[0058] The nano-SiO of this embodiment 2 A preparation method for a cellulose composite separation membrane, comprising the following steps:

[0059] (1) Dissolving cellulose in ionic liquid to form casting solution: mix fully dried cotton pulp with ionic liquid 1-ethyl-3-methylimidazole acetate, dissolve at 100°C for 3 hours, and prepare into a casting solution with a mass fraction of 5%.

[0060] (2) Preparation of nano-SiO 2 : Thoroughly mix tetraethyl orthosilicate and ethanol at a volume ratio of 1:40 to obtain a reaction solution; add ammonia water with a concentration of 25% to the reaction solution, stir at room temperature for 3 minutes, and then stir at 45°C for 15 hours transparent SiO 2 Gel solution; the volume of the reaction solution is 1.8% of the volume of ammonia water; the obtained gel solution is heated and evaporated to obtain a gel, and dried at 60°C for 15 hours to obtain white nano-SiO 2 powder.

[0061] (3) Using silane coupling agent γ-(2,3-epoxyp...

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Abstract

The invention discloses a preparation method of nano-SiO2 / cellulose composite separating membranes, which comprises the following steps: (1) dissolving cellulose in ionic liquid so as to form a membrane-casting solution; (2) preparing nano-SiO2; (3) carrying out modification on the nano-SiO2 by using a silane coupling agent gamma-(2, 3-epoxy propoxy) n-propyltrimethoxysilane; and (4) dispersing the modified nano-SiO2 in the membrane-casting solution obtained in sep (1) so as to obtain a mixed membrane-casting solution; and preparing the mixed membrane-casting solution into a membrane and drying the membrane so as to obtain a nano-SiO2 / cellulose composite separating membrane. According to the invention, the dispersion and uniformity of nano-SiO2 particles in cellulose membranes are improved, and the mechanical strength and thermal stability of the cellulose membranes are further enhanced.

Description

technical field [0001] The invention relates to the technical field of inorganic / organic composite separation membranes, in particular to nano-SiO 2 The preparation method of / cellulose composite separation membrane. Background technique [0002] As the most abundant natural renewable resource in the world, cellulose has advantages that other synthetic materials cannot match. The traditional natural available cellulose mainly comes from wood, but my country's wood resources are limited and rely heavily on imports, so rational development and utilization of other cellulose resources can alleviate the demand for wood resources. However, natural cellulose has the structural characteristics of high crystallinity and a large number of hydrogen bonds between molecules and inside molecules, making it difficult to dissolve in water and common organic solvents. Therefore, cellulose cannot be directly processed into membrane materials. For a long time, scholars from various countries...

Claims

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Application Information

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IPC IPC(8): B01D71/10B01D69/12B01D67/00
Inventor 肖凯军王兆梅刘洋李冰洁
Owner OLANSI HEALTHCARE CO LTD
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