Hydroxyl-terminated polybutadiene-silicone rubber crosslinked alcohol-permselective composite membrane and preparation method thereof
A technology that preferentially penetrates alcohol and silicone rubber. It is applied in the direction of semi-permeable membrane separation, chemical instruments and methods, and membrane technology. It can solve the problems of affecting separation performance, insufficient cross-linking, and insufficient hydrophobicity. Tight binding, permeate flux and enhanced selectivity effects
Active Publication Date: 2013-07-17
武汉容智德环保科技有限公司
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Problems solved by technology
The amount of hydroxybutadiene added needs to be controlled, too much will cause a decrease in selectivity, because its hydrophobicity is not as good as that of PDMS, or severe phase separation occurs, resulting in a decrease in selectivity, and too little can not fully crosslink
Method used
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Embodiment 1
[0020] 1) The preparation method of PVDF porous bottom membrane, the dried PVDF raw material is dissolved in tributyl phosphate to make a solution with a mass fraction of 15%, stir evenly, filter and defoam and scrape the membrane on polyester non-woven fabric, Using water as a gel bath, the PVDF crystalline gel was solidified to obtain a PVDF base film (thickness 45 μm) supported by a non-woven fabric. After the solvent exchange was complete, the base film was soaked in ethanol for 5 minutes and dried naturally.
[0021] 2) Weigh 6g of PDMS and a certain mass of HTPB, dissolve them in 30g of toluene, tetrahydrofuran, and acetone respectively, in which the mass fraction of HTPB is 2%-20%, stir at room temperature for 6 hours to form a uniform solution, and then add 0.5g Tetraethyl orthosilicate and 0.2g of catalyst dibutyltin dilaurate, after the solution is mixed evenly, let it stand for defoaming to obtain the casting solution and pour it on the PVDF bottom film to scrape the...
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Abstract
The invention discloses a hydroxyl-terminated polybutadiene-silicone rubber crosslinked alcohol-permselective composite membrane and a preparation method thereof, belonging to the technical field of pervaporation membrane separation. A polyvinylidene difluoride (PVDF) bottom membrane in the bottom layer of the composite membrane disclosed by the invention is obtained on polyester nonwoven fabric by utilizing crystallization and gelation of the PVDF in a non-solvent; and a filler layer is obtained by co-dissolving hydroxyl-terminated polybutadiene and polydimethylsiloxane (PDMS) silicone rubber in an organic solvent, performing crosslinking reaction, then forming a membrane casting solution and further pouring on the bottom membrane for curing. The hydroxyl-terminated polybutadiene-silicone rubber crosslinked alcohol-permselective composite membrane disclosed by the invention has the advantages of more compact separation layer, tight joint with the bottom membrane and almost no defects, and can improve the swelling resistance, permeation flux and selectivity of the membrane. The preparation method has the advantages of simple process flow and easiness in control of operation conditions, the comprehensive properties of the membrane are significantly better than those of the existing pure PDMS, and the hydroxyl-terminated polybutadiene-silicone rubber crosslinked alcohol-permselective composite membrane has important values in industrial applications.
Description
technical field [0001] The invention belongs to the technical field of pervaporation separation, and in particular relates to a butylated hydroxy rubber-silicone rubber cross-linked alcohol-preferred composite film and a preparation method thereof. Background technique [0002] The homogeneous membrane represented by silicone rubber has played an important role in the field of pervaporation membrane separation, but the separation performance of ethanol / water system needs to be further improved. PDMS is especially suitable for the diffusion of organic molecules due to the small intermolecular force, high flexibility of molecules and hydrophobic methyl side chains. However, the pure PDMS membrane is very easy to swell, and the mechanical properties of the film are very poor, so it has little industrial use. Realizing molecular level cross-linking with other polymer materials and preparing "polymer alloys" is an important way to solve their applications. Crosslinking is the f...
Claims
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IPC IPC(8): B01D71/70B01D69/12B01D67/00
Inventor 李继定夏阳展侠房满权陈金勋
Owner 武汉容智德环保科技有限公司