Nanofiber reinforced superparamagnetic polyvinyl alcohol composite film and preparation method thereof

A polyvinyl alcohol and superparamagnetic technology, which is applied in the field of composite membranes, can solve the problems of water absorption and water retention, insufficient slow-release performance, etc., and achieve the effects of strong water absorption, improved slow-release effect, and delayed release time

Inactive Publication Date: 2017-08-04
宿州市逢源生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are insufficient water absorption and water retention and slow release performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0017] A preparation method of a nanofiber-reinforced superparamagnetic polyvinyl alcohol composite membrane, characterized in that, the steps are as follows:

[0018] a. Mechanically pulverize 20kg reed pulp and pass through 80-mesh sieve, add sodium hydroxide aqueous solution at 1:40, swell in 80-90°C constant temperature water bath for 1 hour, filter, wash until neutral, mix with sulfuric acid at 1:50, and stir evenly , hydrolyzed at 50-60°C for 2 hours, centrifuged and washed to neutral, and ultrasonically crushed for 1 hour to obtain nanocellulose crystal hydrosol;

[0019] b. Heat and boil the hydrosol obtained in a, add 0.2gkg FeSO 4 ·7H 2 O, 0.5gkg FeCl 3 ·6H 2 O, under the protection of nitrogen, in a constant temperature water bath at 60-70°C, mechanical stirring, adjust the pH to 9-10, react for 2 hours, heat up to 80-90°C and age for 2 hours, cool to room temperature, centrifugally wash until neutral, and ultrasonically disperse for 1 hour , to get loaded nano-...

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PUM

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Abstract

The invention discloses a nanofiber reinforced superparamagnetic polyvinyl alcohol composite film and a preparation method thereof. The method is characterized by comprising the following steps: adding an aqueous solution of sodium hydroxide and sulfuric acid into reed pulp, and performing ultrasonic crushing to obtain nanocellulose crystal hydrosol; heating and boiling, adding FeSO4.7H2O and FeCl3.6H2O, and ultrasonically dispersing to obtain nano Fe3O4 supported hydrosol after reacting; adding distilled water into alkali lignin so as to obtain a component A; adding acetic acid into chitosan so as to prepare a solution, and adding glycerin to be mixed with the component A; mixing starch and sodium hydroxide, adding deionized water, fully mixing with polyvinyl alcohol and borax, and reacting to obtain a crosslinked coating solution; covering a part of film-forming solution on a polyfluortetraethylene plate, and airing to obtain a bottom film; alternatively depositing and self-assembling the supported hydrosol on the bottom film so as to obtain a magnetic supported interlayer; alternatively depositing and self-assembling another part of film-forming solution on the interlayer so as to obtain another film layer, thereby obtaining the magnetic film material.

Description

technical field [0001] The invention relates to the field of composite membranes, in particular to a nanofiber-reinforced superparamagnetic polyvinyl alcohol composite membrane and a preparation method thereof. Background technique [0002] Biomass charcoal is a solid product obtained by pyrolyzing biomass materials such as crop straws and sawdust under the environmental conditions of limiting or isolating oxygen. Due to the high ash content, the biochar prepared from crop stalks and other wastes is limited in the industrial field, but it can be widely used in the agricultural field. [0003] In Zhang Wei's master's degree thesis "Preparation and Performance Research of Rice Straw Charcoal-based Slow-release Fertilizer", rice straw was used as raw material, and the continuous pyrolysis device was respectively heated at 400°C, 450°C, 500°C, 550°C, and 600°C. Rice straw is pyrolyzed at high temperature to prepare biochar. With the help of the adsorption performance of biocha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L29/04C08L3/02C08L97/00C08L5/08C08K3/38C08K3/22C08L1/04
Inventor 解安庆
Owner 宿州市逢源生物科技有限公司
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