Green preparation method of silicon rubber/silicon dioxide pervaporation membrane based on emulsion film forming

A pervaporation membrane, silica technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as safety hazards, environmental pollution, waste of resources, etc., to achieve low production cost, good integration, The effect of improving compatibility

Active Publication Date: 2016-08-24
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solvent evaporation method needs to volatilize a large amount of organic solvent (about 80wt%) during the preparation of organic silicon pervaporation membrane, which will not only cause serious environmental pollution, but also a waste of resources. In addition, a large amount of organic solvent dispersed in the production environment Organic vapors also pose a huge safety hazard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A green preparation method of silicone rubber / silicon dioxide pervaporation membrane based on emulsion film formation, comprising the following steps, the formula ratio is by weight:

[0019] (1) Dissolve 0.2 parts of polyether-type silicone nonionic surfactant at 20°C in 10 parts of water-based silica sol with a silicon dioxide content of 10%, a pH value of 9, and a particle size of 20 nm, and then mix with 60 parts The hydroxyl-terminated polydimethylsiloxane was mixed and stirred at 200r / min for 3 hours to obtain a polysiloxane emulsion, and the droplet size of the dispersed phase was 45 μm; (2) 1 part of tetraethoxysilane, 0.1 part of dibutyl Add tin dilaurate to the above emulsion, mix and react at 20°C for 2 hours to form an emulsion casting solution; evenly scrape the casting solution on the polyvinylidene fluoride ultrafiltration membrane with a coating thickness of 100 μm, and place it at room temperature After 12 hours, the water phase droplets were removed by...

Embodiment 2

[0022] A green preparation method of silicone rubber / silicon dioxide pervaporation membrane based on emulsion film formation, comprising the following steps, the formula ratio is by weight:

[0023] (1) 0.45 parts of anionic polysiloxane phosphate ester salt surfactant is dissolved in 15 parts of silicon dioxide content at 20 DEG C and be 20%, pH value is 9.5, particle diameter is the aqueous silica sol of 30nm, then with 65 parts of hydroxyl-terminated polydiphenylsiloxane were mixed and stirred for 2 hours at a rate of 300r / min to obtain a polysiloxane emulsion, and the droplet size of the dispersed phase was 40 μm; (2) 2 parts of vinyltriethoxysilane, 0.2 Add one part of monobutyltin oxide into the above emulsion, mix and react at 25°C for 1.5h to form an emulsion casting solution; evenly scrape the casting solution on the polyvinylidene fluoride ultrafiltration membrane, the coating thickness is 100μm, room temperature After standing for 12 hours to volatilize and remove t...

Embodiment 3

[0026] A green preparation method of silicone rubber / silicon dioxide pervaporation membrane based on emulsion film formation, comprising the following steps, the formula ratio is by weight:

[0027] (1) 0.5 part of cationic polysiloxane quaternary ammonium salt surfactant is dissolved in 15 parts of silicon dioxide content at 25 DEG C and is 30%, and pH value is 10, and particle diameter is the aqueous silica sol of 40nm, then with 65 parts of vinyl-terminated polydimethylsiloxane were mixed and stirred for 2 hours at a rate of 500r / min to obtain a polysiloxane emulsion, and the droplet size of the dispersed phase was 20 μm; (2) 2 parts of vinyltriethoxysilane, Add 0.3 parts of dibutyltin oxide to the above emulsion, mix and react at 25°C for 2 hours to form an emulsion casting solution; evenly scrape the casting solution on the polyvinylidene fluoride ultrafiltration membrane, and the coating thickness is 150 μm , placed at room temperature for 12 hours, after volatilization ...

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Abstract

The invention relates to a green preparation method of a silicon rubber/silicon dioxide pervaporation membrane based on emulsion film forming and belongs to the technical field of membrane separation. The green preparation method has main characteristics that (1) mixing and emulsifying water-soluble sol, a surfactant and polysiloxane to prepare water-in-oil polysiloxane emulsion, wherein the diameter of water-phase liquid drops is 1-45 microns; and (2) adding a catalyst and a cross-linking agent and mixing to obtain an emulsion type membrane casting solution, coating the emulsion type membrane casting solution on a polyvinylidene fluoride ultrafiltration membrane, and carrying out drying and cross-linking to prepare the silicon rubber/silicon dioxide pervaporation membrane. Based on an emulsion film forming technology, any organic solvent is not added in a membrane preparation process, so that volatile organic steam is not generated and a green and environment-friendly membrane preparation concept is met. The prepared hybridized silicon rubber pervaporation membrane has the characteristics of large permeation flux, good separation effect, stable structure and the like, is suitable for removing low-concentration organic matters in water and is particularly suitable for separating low-molecular-weight alcohols in a fermentation solution.

Description

technical field [0001] The invention relates to a green preparation method of silicone rubber / silicon dioxide pervaporation membrane based on emulsion film formation, which belongs to the field of high technology and membrane separation technology. Background technique [0002] Pervaporation is a new membrane separation technology process that utilizes the properties of different dissolution and diffusion rates of components in a liquid mixture to achieve separation. Compared with the traditional separation technology, the pervaporation process has the advantages of good separation performance, low energy consumption, no pollution to the environment, and simple process, and has become one of the most promising separation technologies today. The application of pervaporation separation technology includes three aspects: dehydration of organic matter, recovery of valuable organic matter in water, and separation of organic / organic systems. Among them, the removal of low-concentr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/70B01D67/00B01D61/36
Inventor 白云翔唐郡陈德强张春芳孙余凭顾瑾
Owner JIANGNAN UNIV
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