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Preparation method of silicone rubber gas separation coating

A technology of gas separation and silicone rubber, applied in separation methods, semi-permeable membrane separation, dispersed particle separation, etc., can solve the problems of low gas permeability and poor separation selectivity, and achieve improved selectivity and good gas permeability Effect

Inactive Publication Date: 2021-03-16
北京迈安瑞科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional silicone rubber is based on vinyl-containing polydimethylsiloxane, and polyorganosiloxane containing multiple Si-H bonds is used as a crosslinking agent. Three-dimensional crosslinked silicone rubber is obtained by addition reaction under heating. However, there is a basic contradiction in the research and development of membrane materials: that is, good gas permeability always has poor separation selectivity, while good selectivity has poor gas permeability. Low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: 2% of hydroxy-terminated methyl silicone oil 80cst, 1500cst of hydroxy-terminated methyl silicone oil 1%, 3% of octyltrimethoxysilane, 1% of octylmethyldimethoxysilane, 0.16% of hydrogen-containing silicone oil and Dibutyl tin dilaurate 0.16%, dissolved in gasoline to make casting solution. A layer of the casting solution was coated on the surface of polysulfone bottom membrane (pure water flux: 16.5 L / (m2h), molecular weight cut off: 30,000), and dried at 80° C. for 4 hours. The measured permeation rate JN2=0.254m3·m-2·atm-1·h-1, separation coefficient α=2.41.

Embodiment 2

[0033] Example 2: 1% of hydroxy-terminated methyl silicone oil 80cst, 3000cst of hydroxy-terminated methyl silicone oil 3%, 2% of octyltrimethoxysilane, 1% of octylmethyldimethoxysilane, 0.16% of hydrogen-containing silicone oil And dibutyltin dilaurate 0.16%, dissolved in n-hexane to make casting solution. A layer of the casting solution was coated on the surface of the polyetherimide base film (pure water flux: 14.5 L / (m2h), molecular weight cut off: 45000), and dried at 90° C. for 2 hours. The measured penetration rate JN2=0.251m3·m-2·atm-1·h-1, separation coefficient α=2.43.

[0034] Implement the third step: put hydroxy-terminated methyl silicone oil 80cst 2%, hydroxy-terminated methyl silicone oil 240cst 2%, hydroxy-terminated methyl silicone oil 3000cst 1%, octyltrimethoxysilane 2%, octylmethyldimethoxy Silane 1%, hydrogen-containing silicone oil 0.16% and dioctyl tin dilaurate 0.16%, dissolved in isooctane to make casting solution. A layer of the casting solution was...

Embodiment 4

[0035] Example 4: hydroxy-terminated methyl silicone oil 80cst 1%, hydroxy-terminated methylphenyl silicone oil 240cst 1%, hydroxy-terminated methylphenyl silicone oil 1500cst 1%, octyltrimethoxysilane 2%, octylmethyl Dimethoxysilane 2%, hydrogen-containing silicone oil 0.16% and dioctyl tin dilaurate 0.16%, dissolved in n-heptane to make casting solution. A layer of the casting solution was coated on the surface of the polyimide base film (pure water flux 12.4 L / (m2h), molecular weight cut-off 25000), and dried at 80° C. for 3 hours. The measured penetration rate JN2=0.252m3·m-2·atm-1·h-1, separation coefficient α=2.42.

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Abstract

The invention discloses a preparation method of a silicone rubber gas separation coating. The preparation method comprises the following steps: S1, pouring a proper amount of an organic solvent into acontainer; S2, weighing a proper amount of hydroxyl-terminated methyl silicone oil, octyl trimethoxy silane, octyl methyl dimethoxy silane, hydrogen-containing silicone oil and an organic tin catalyst, and pouring the hydroxyl-terminated methyl silicone oil, the octyl trimethoxy silane, the octyl methyl dimethoxy silane, the hydrogen-containing silicone oil and the organic tin catalyst sequentially into the container containing the organic solvent; and S3, conducting stirring to obtain a membrane casting solution, taking out a bottom membrane, coating the surface of the bottom membrane with amembrane casting solution through a brush, and regulating and controlling the density and structure of the polymer. Therefore, the selectivity of a prepared silicone rubber separation layer is improved, and the silicone rubber separation layer has good gas permeability. The prepared silicone rubber coating can be used in the fields of separation of oxygen and nitrogen, recovery of organic vapor such as ethylene, propylene and gasoline, pervaporation and the like.

Description

technical field [0001] The invention relates to a preparation method, in particular to a preparation method of a silicon rubber gas separation coating, which belongs to the separation membrane coating preparation technology. Background technique [0002] Membrane gas separation technology refers to the technology of using polymer membrane to separate or enrich a certain component of mixed gas driven by pressure difference. It has the characteristics of no pollution, low energy consumption, high separation efficiency, small equipment size, and arbitrary change in scale and processing capacity. It has shown attractive application prospects in industrial production, environmental protection, and biological materials. [0003] The polymer membrane is the core of the membrane gas separation process. It is of great significance to develop high-performance gas separation membranes. The composite membrane refers to an asymmetric membrane with different materials for the bottom membr...

Claims

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Application Information

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IPC IPC(8): B01D71/06B01D53/22B01D67/00B01D69/02B01D69/12
CPCB01D71/06B01D69/125B01D69/02B01D67/0002B01D53/228
Inventor 杜彬
Owner 北京迈安瑞科技有限公司
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