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Method for preparing organic silicon modified chitosan membrane

A technology of chitosan film and organosilicon, which is applied in the field of preparation of organosilicon modified chitosan film, can solve the problems of poor acid resistance, high brittleness, and poor flexibility, and achieve excellent water resistance, improved flexibility, and elongation at break. The effect of increasing the length

Inactive Publication Date: 2015-11-11
CHANGZHOU YAHUAN ENVIRONMENTAL PROTECTION TECH
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Problems solved by technology

[0005] The technical problem mainly solved by the present invention: Aiming at the drawbacks that the current films made of pure chitosan have high brittleness, poor flexibility, and poor acid resistance, which brings great difficulties to their application, a modified organic silicon film is provided. Chitosan film, the method uses chloroplatinic acid as a catalyst, synthesizes epoxy polysiloxane through the hydrosilylation reaction of hydrogen-containing silicone oil and allyl glycidyl ether, and utilizes the prepared epoxy group Polysiloxane and chitosan are reacted in acetic acid solution, and the film is laid to prepare a silicone-modified chitosan film, which has better flexibility and higher heat resistance

Method used

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Embodiment Construction

[0016] Take 5-10mL octamethylcyclotetrasiloxane emulsion and put it into the vacuum distillation equipment, blow nitrogen into it, raise the temperature in the water bath to 70-80°C, stir evenly, and distill for 10-15min under the condition of 1000-1500Pa. After cooling to room temperature, add 5-10g hydrogen-containing silicone oil and 1-2mL concentrated sulfuric acid with a mass fraction of 98% into the reactor, and react at room temperature for 4 hours; add sodium bicarbonate solution into the reactor drop by drop until the concentrated sulfuric acid is completely neutralized. And, stir with a magnetic stirrer for 3-5 hours, the stirring speed is 200-300r / min, filter the precipitate after the stirring is completed, continue to reduce the pressure to 800-900Pa, heat it in a water bath to 40-50°C, and distill off the low boiling matter , to obtain colorless and transparent low-hydrogen silicone oil; weigh allyl glycidyl ether and toluene at a mass ratio of 1.5:1, add 0.5 to 1 ...

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Abstract

The invention relates to a method for preparing an organic silicon modified chitosan membrane, and belongs to the field of film material preparation. The method includes the steps that chloroplatinic acid serves as a catalyst; by means of hydrosilylation of silicon oil containing hydrogen and allyl glycidyl ether, epoxy group polysiloxane is synthesized; the prepared epoxy group polysiloxane and chitosan are used to react in an acetic acid solution, membrane laying is carried out, and the organic silicon modified chitosan membrane is prepared. The prepared organic silicon modified chitosan membrane has excellent water resistance, high and low temperature resistance, weather resistance and air permeability. Compared with a non-modified chitosan material, the breaking elongation of the membrane is increased by over 30%, and flexibly is greatly improved.

Description

technical field [0001] The invention relates to a method for preparing an organosilicon-modified chitosan film, which belongs to the field of film material preparation. Background technique [0002] The chitosan molecular chain contains a large number of hydroxyl groups and amino groups, which has good film-forming properties, permeability and adsorption properties, and is easy to carry out structural modification and modification. Therefore, it is a natural polymer functional film material with excellent performance. Chitosan molecules contain two types of active groups, hydroxyl and amino, which are conducive to modification by various techniques, such as cross-linking, copolymerization, blending, ionization, or amino groups and transition metal ions on the chitosan molecular chain By forming coordination complexes, etc., chitosan films for different purposes can be made. Because chitosan film has many advantages mentioned above, it is widely used in many fields. [0003...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L5/08C08L83/06C08G77/38
Inventor 雷思宇林大伟
Owner CHANGZHOU YAHUAN ENVIRONMENTAL PROTECTION TECH
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