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Hydroxypropyl cellulose-silicone hybrid membrane and preparation method thereof

A technology of hydroxypropyl cellulose and hybrid membrane, applied in the field of membrane materials, can solve the problems such as the decrease of the salt rejection rate, and achieve the effect of improving the rejection rate

Inactive Publication Date: 2019-06-25
重庆化工职业学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adjusting the structure of the bridging group, the affinity of the silicone membrane to water was significantly improved, and the –CH bridged by the BTESO network was replaced by introducing more polar –CH==CH– and –C≡C- bridging groups. 2 –CH 2 – group, thereby increasing the water permeability of the membrane, but the salt rejection rate decreases during reverse osmosis

Method used

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  • Hydroxypropyl cellulose-silicone hybrid membrane and preparation method thereof
  • Hydroxypropyl cellulose-silicone hybrid membrane and preparation method thereof
  • Hydroxypropyl cellulose-silicone hybrid membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation of embodiment 1 BTESO / HPC sol

[0025] Fully dissolve a certain amount of organosilicon precursor 1,8-bis(triethoxysilyl)octane (abbreviated as BTESO) into a certain amount of ethanol (mass fraction of precursor is 5%), and then A certain amount of deionized water was added drop by drop, and different amounts of hydroxypropyl cellulose (abbreviated as HPC) were added. The hydroxypropyl content in hydroxypropyl cellulose was 66wt%, and m(HPC) / m (BTESO was 5 %, 10%, 15%, 20%, add dilute hydrochloric acid dropwise, the molar ratio of each component is n(BTESO):n(H 2 O):n(HCl)=1:50:0.3. The mixed solution was placed in a 40°C water bath and continuously stirred for 2 hours, so that BTESO and HPC were hydrolyzed and polymerized under the combined action of water and hydrochloric acid to form a sol, which was named BTESO / HPC-5, BTESO / HPC-10, respectively. BTESO / HPC-15, BTESO / HPC-20. The obtained sol was refrigerated in the refrigerator for film coating, and...

Embodiment 2

[0026] Example 2 Preparation of BTESO / HPC hybrid membrane

[0027] Preparation of silicon-zirconium (SiO) by hydrolytic polymerization of ethyl orthosilicate and zirconium 2 – ZrO 2 ) sol, the α-Al 2 o 3 The tubular ceramic support was preheated in an oven at 200 °C for 20 min, then taken out, and immediately soaked with absorbent cotton to remove SiO 2 – ZrO 2 (3wt%) sol, rub it on the hot ceramic support in the same direction, put it into a tube furnace at 550 ℃ for calcination for 15min immediately after coating, repeat this step 6-8 times to form a transition layer, thereby reducing Support pore diameter. Finally, the four BTESO / HPC sols (0.6wt%) obtained in Example 1 were coated on the transition layer and heated in N 2 Calcined at 150°C for 20 minutes, repeating this step 2 to 3 times to obtain organic silicon hybrid films, which were named BTESO / HPC-5 hybrid film, BTESO / HPC-10 hybrid film, and BTESO / HPC-15 hybrid film. Membrane, BTESO / HPC-20 hybrid membrane.

Embodiment 3

[0028] Performance characterization of embodiment 3 BTESO / HPC hybrid membrane

[0029] figure 1 (a) and (b) are the AFM images of the surface morphology of BTESO and BTESO / HPC-15 hybrid membranes, respectively, and the scanning range is 5 μm×5 μm. Depend on figure 1 It can be seen that compared with the unmodified BTESO membrane, the surface of 15wt% HPC crosslinked BTESO / HPC-15 hybrid membrane is smoother, and the average surface roughness of the two is 100 and 120nm, respectively. figure 2 It is a cross-sectional SEM photo of the BTESO / HPC-15 hybrid membrane. The surface of the membrane is continuous and free of defects, and the three-layer structure of the cross-section is clearly visible. From top to bottom are the BTESO / HPC separation layer, SiO 2 – ZrO 2 transition layer and Al 2 o 3 The thickness of support layer and separation layer is about 400nm.

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Abstract

The invention discloses a hydroxypropyl cellulose-silicone hybrid membrane. The hybrid membrane comprises a support body, a transition layer and a separation layer, the support body is an alpha-Al2O3ceramic support body, the separation layer is a BTESO / HPC sol, and the BTESO / HPC sol is obtained by reacting 1,8-bis(triethoxysilyl)octane with hydroxypropyl cellulose. Cross-linking copolymerizationmakes hydroxyl-rich HPC stably distributed in a BTESO membrane network to make the structure of the membrane network dense and increase the water permeability and the salt ion rejection rate (apparentrejection rate) of the membrane, so the water permeability reaches 1.8 * 10<-13> m<3>.m<-2>.s<-1>.Pa<-1>, and the divalent sodium salt rejection rate reaches 99.0%.

Description

technical field [0001] The invention belongs to the field of membrane materials, and relates to a hydroxypropyl cellulose-organosilicon hybrid membrane and a preparation method thereof. Background technique [0002] Reverse osmosis technology is an important way to obtain clean fresh water, and it is of great significance to solve the shortage of fresh water resources. Reverse osmosis membrane is the core component of reverse osmosis technology, and the development of key functional membrane materials and high-performance reverse osmosis membranes has always been the focus of membrane technology development in developed countries such as the United States and Japan. The aromatic polyamide composite membrane prepared by interfacial polymerization has the advantages of high salt rejection rate, large flux and resistance to organic solvents, and dominates the current reverse osmosis membrane market. However, aromatic polyamide membranes have poor fouling resistance. Particles,...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/10B01D69/12B01D61/02
Inventor 廖明佳乔雷
Owner 重庆化工职业学院
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