Preparation method of environment-friendly silicone rubber composite membrane

A silicone rubber composite membrane, silicone rubber technology, applied in separation methods, chemical instruments and methods, membrane technology and other directions, can solve the problems of corrosion of production equipment, affecting the health of operators, and achieve the goal of improving air quality and saving production costs. Effect

Inactive Publication Date: 2011-05-11
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This silicone rubber solution is formed by dissolving silicone rubber in various organic solvents (gasoline, n-pentane, n-hexane, cyclohexane, n-heptane, benzene, toluene, esters and alcohols, etc.), and coated on After the base film is applied, the solvent will all volatilize, and a large amount of organic waste gas will be generated during the composite film coating and solvent volatilization stage, which will seriously affect the health of the operators and cause corrosion to the production equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Mix octamethylcyclotetrasiloxane (D4), methyltrimethoxysilane, emulsifier (dodecylbenzenesulfonic acid) and water with a mass percentage of 35%, and stir at a high speed for 0.5 to 1 h , to make it fully emulsified; then raise the temperature to 60-90°C, carry out the ring-opening polymerization reaction for 2-3 hours; then cool down to room temperature, adjust the pH value of the system to 7-8, and obtain the emulsion of hydroxypolydimethylsiloxane; Dilute the hydroxyl polydimethylsiloxane aqueous emulsion to a solid mass fraction of 10%, mix it with 2% methyltrimethoxysilane crosslinking agent by emulsion mass, add 1% butyltin dilaurate catalyst by emulsion mass, and then apply Apply to the surface of the polyacrylonitrile film. After curing at room temperature for 1 day, a silicone rubber composite film was obtained. Under the operating pressure of 0.072MPa, the oxygen concentration in the oxygen-enriched air of the composite membrane was measured to be 2...

Embodiment 2

[0014] Example 2: Mix 350g of hydroxypolysiloxane and 70g of orthosilicate evenly, add 10g of polyoxyethylene lauryl ether mixture, stir and mix, and then add 570g of water in batches under stirring to obtain hydroxypolysiloxane Oxane emulsion; then dilute 100 parts by mass of the silicone emulsion with 300 parts by mass of water, add 5 parts by mass of an organotin catalyst, stir at room temperature for 1 hour, and then apply it on the surface of the polysulfone membrane. After curing at room temperature for 1 day, a silicone rubber composite film was obtained. Under the operating pressure of 0.072MPa, the oxygen concentration in the oxygen-enriched air of the composite membrane was measured to be 29.2%, and the oxygen-enriched flux was 0.9m 3 / (m 2 h).

Embodiment 3

[0015] Example 3: Mix octamethylcyclotetrasiloxane (D4), vinyl siloxane, emulsifier (dodecylbenzenesulfonic acid) and water with a mass percentage of 10%, and stir at a high speed for 0.5 to 1 h to make It is fully emulsified; then the temperature is raised to 70-90°C, and the ring-opening polymerization reaction is carried out for 2-3 hours; then the temperature is lowered to about 50°C, and the pH value of the system is adjusted to 7-8; the vinyl polydimethylsiloxane aqueous emulsion Mix well with 6% of the emulsion mass of hydrogen-containing silicone oil cross-linking agent, add the emulsion mass of 6‰ chloroplatinic acid metal catalyst, and apply it on the surface of the polyvinylidene fluoride film. After curing at room temperature for 1 day, under the operating pressure of 0.072MPa, the oxygen-enriched side concentration of the composite membrane was measured to be 30%, and the oxygen-enriched flux was 0.8m 3 / (m 2 h)

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PUM

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Abstract

The invention discloses a preparation method of an environment-friendly silicone rubber composite membrane, and belongs to the technical field of composite membrane preparation. The preparation method comprises the following steps: silicone rubber aqueous emulsion is prepared; a high-molecular basal membrane is coated with a layer of silicone rubber aqueous emulsion; and the high-molecular basal membrane coated with the layer of silicone rubber aqueous emulsion is solidified at a temperature between 10 and 120 DEG C to obtain a finished silicone rubber composite membrane. Silicone rubber includes hydroxyl silicone rubber and vinylsiloxane rubber which are either crude rubber or aqueous emulsion directly synthesized by silicon monomers. No organic solvent is used in the production process of the silicone rubber composite membrane, so that air quality of the operation environment is improved, and the production cost of the membrane is saved.

Description

technical field [0001] The invention relates to a method for preparing a silicone rubber composite film by using a silicone rubber aqueous emulsion, which belongs to the technical field of composite film preparation, and is mainly applied in the preparation of oxygen-enriched air containing high-concentration oxygen, nitrogen-enriched air, hydrogen recovery, and organic vapor recovery. , natural gas purification and other gas separation membranes, and the preparation of pervaporation membranes for alcohol-water separation, organic matter and organic matter, etc. Background technique [0002] Separation membranes used for pervaporation and oxygen enrichment, natural gas dehydration, organic vapor separation, gasoline desulfurization, etc. are usually silicone rubber composite membranes, that is, on various base membranes, such as polysulfone, polyethersulfone, polyamide, polyacrylonitrile, Polyvinylidene fluoride, polyethylene and other films are coated with a layer of silico...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C08L83/06C08L83/07D06M15/643C08G77/16C08G77/20B01D71/70B01D69/12B01D67/00B01D53/22
Inventor 彭跃莲安坤
Owner BEIJING UNIV OF TECH
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