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Polycarbonate diol crosslinking organosilicone hybrid membrane and preparation method thereof

A technology of cross-linking silicone and polycarbonate, which is applied in the field of membrane materials, can solve the problems such as the decrease of salt rejection rate, and achieve the effect of dense membrane network structure and improvement of rejection rate.

Inactive Publication Date: 2019-07-05
CHONGQING VOCATIONAL INST OF ENG
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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 –CH2 bridged by the BTESM network was replaced by introducing more polar –CH==CH– and –C≡C- bridging groups. –CH2– groups, thereby increasing the water permeability of the membrane, but the salt rejection rate decreased during the reverse osmosis process

Method used

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  • Polycarbonate diol crosslinking organosilicone hybrid membrane and preparation method thereof
  • Polycarbonate diol crosslinking organosilicone hybrid membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The preparation of embodiment 1 BTESM / PCDL sol

[0021] A certain amount of organosilicon precursor bis(triethoxysilyl)methane (BTESM) was fully dissolved in a certain amount of ethanol (the mass fraction of the precursor was 5%), and then a certain amount of Deionized water, adding different amounts of polycarbonate diol (PCDL) (m(PCDL) / m(BTESM) are 15%, 20%, 25%, 30%, 35%), drop concentrated hydrochloric acid, each The component molar ratio is n(BTESM):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 BTESM and PCDL were hydrolyzed and polymerized under the joint action of water and hydrochloric acid to form sols, which were named BTESM / PCDL-15, BTESM / PCDL-20, respectively. BTESM / PCDL-25, BTESM / PCDL-30, BTESM / PCDL-35. The obtained sol was refrigerated in the refrigerator for film coating, and part of the sol was placed in a blast oven at 60°C for 3 hours to obtain a xerogel, which was ground i...

Embodiment 2

[0022] Embodiment 2 Preparation of BTESM / PCDL hybrid film

[0023] 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 BTESM / PCDL sols (0.6wt%) obtained in Example 1 were coated on the transition layer and heated in N 2 Calcined at 200°C for 20 minutes, repeating this step 2 to 3 times to obtain organic silicon hybrid films, named BTESM / PCDL-15 hybrid film, BTESM / PCDL-20 hybrid film, BTESM / PCDL-25 hybrid film membrane, BTESM / PCDL-30 hybrid membrane, BTESM / PCDL-35 ...

Embodiment 3

[0024] Example 3 Research on Surface Water Contact Angle of BTESM / PCDL Hybrid Membrane

[0025] The water contact angle of the BTESM / PCDL hybrid membrane was measured, and the data in Table 1 were obtained.

[0026] Table 1 Relationship between water contact angle and PCDL content of BTESM / PCDL hybrid film

[0027]

[0028] Table 1 shows that with the increase of the hydrophilic PCDL content in the cross-linked silicon network, the water contact angle showed a downward trend, indicating the improvement of the hydrophilicity of the membrane surface.

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Abstract

The invention discloses a polycarbonate diol crosslinking organosilicone hybrid membrane. The membrane is prepared from a support body, a transition layer and a separation layer, the support body is an alpha-A12O3 ceramic support body, the separation layer is BTESM / PCDL collosol, and the BTESM / PCDL collosol is prepared from bis(triethoxysilyl)methane and polycarbonate diol through a reaction. Through crosslinking and copolymerization, PCDL with rich hydroxide radicals is stably distributed in a membrane network, the membrane network structure is more compact, the water permeability rate and salt ion rejection rate (apparent rejection rate) of the membrane are increased, so that the water permeability rate reaches 1.6*10<-13> m<3>.m<-2>.s<-1>.Pa<-1>, and the salt ion rejection rate reaches99.6%.

Description

technical field [0001] The invention belongs to the field of membrane materials, and relates to a polycarbonate diol crosslinked organic silicon 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. P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/70B01D69/10B01D69/02B01D67/00B01D61/02
CPCB01D61/025B01D67/0079B01D67/0093B01D69/02B01D69/10B01D71/70
Inventor 朱韵顾衡
Owner CHONGQING VOCATIONAL INST OF ENG