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Preparation method for porphyra microcrystalline cellulose/nano platinum composite material

A microcrystalline cellulose and composite material technology is applied in the field of preparation of laver microcrystalline cellulose/nano platinum composite materials, and can solve the problems of inability to uniformly disperse the surface of the material matrix, easy agglomeration of platinum nanoparticles, and easy agglomeration into agglomerates. Achieve the effect of improving antibacterial performance, cheap materials, saving resources and costs

Inactive Publication Date: 2016-03-02
丁玉琴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: in view of the current preparation process of platinum nano-antibacterial materials, platinum nanoparticles are easy to agglomerate, cannot be uniformly dispersed on the surface of the material matrix, are easy to agglomerate, and have poor antibacterial effect. Porphyra fiber was pickled and bleached with calcium hypochlorite, and then microcrystalline cellulose was prepared by secondary acid hydrolysis and alkali leaching, and then ethylene glycol was used as the reducing agent and reaction solvent to nucleate and grow platinum nitrate nanoparticles. Evenly distributed on the surface of microcrystalline cellulose, greatly improving its antibacterial properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Firstly, select the dried laver, and crush it into laver slag with a diameter of 5mm through a jet mill. According to the mass ratio of 1:500, stir and mix the laver slag and distilled water at 30°C, and wait for the laver to absorb water and swell and let it stand After 10 minutes, laver slag was prepared, and then 0.15mol / L hydrochloric acid solution was added to the laver slag at a mass ratio of 1:5, and acidolysis was carried out at 40°C for 0.5h; after the acidolysis was completed, it was suction-filtered And collect the filter cake, then according to the mass ratio of 1:5, the filter cake and the sodium carbonate solution with a mass concentration of 15% are stirred and mixed, and stirred at a speed of 300r / min until the solution turns black, then continue to stir for 3min, and stop heating , let it stand and cool to 20°C, and wash with deionized water until the pH is 7.0 to prepare acid-decomposed laver residue; according to the mass ratio of 1:8, stir and mix the...

example 2

[0022]Firstly, select the dried laver, and crush it into laver slag with a diameter of 5mm through a jet mill. According to the mass ratio of 1:500, stir and mix the laver slag and distilled water at 35°C, and wait for the laver to absorb water and swell and let it stand 12 minutes to prepare laver residue, then add 0.15mol / L hydrochloric acid solution to the laver residue at a mass ratio of 1:5, and acidolyze it at 42°C for 0.8h; after the acid hydrolysis is completed, suction filter it And collect the filter cake, then press the mass ratio 1:5, filter cake and mass concentration are 15% sodium carbonate solution stirring and mixing, make it stir at 450r / min speed until the solution turns black, then continue to stir for 4min, stop heating, Allow it to stand and cool to 25°C, and wash with deionized water until the pH is 7.1 to prepare the acid-decomposed laver residue; according to the mass ratio of 1:8, the sodium hypochlorite solution with a mass concentration of 10% is sti...

example 3

[0025] Firstly, select the dried laver, and crush it into laver slag with a diameter of 5mm in a jet mill. Stir and mix the laver slag and distilled water at 40°C according to the mass ratio of 1:500, and wait for the laver to absorb water and swell and let it stand 15 minutes to prepare laver residue, then add 0.15mol / L hydrochloric acid solution to the laver residue according to the mass ratio of 1:5, acidolysis at 45°C for 1.0h; after the acid hydrolysis is completed, suction filter it And collect the filter cake, then according to the mass ratio of 1:5, the filter cake and the sodium carbonate solution with a mass concentration of 15% are stirred and mixed, and stirred at a speed of 600r / min until the solution turns black, then continue to stir for 5min, stop Heat, let it stand and cool to 30°C, and wash with deionized water until the pH is 7.2 to prepare the acid-decomposed laver residue; according to the mass ratio of 1:8, stir the sodium hypochlorite solution with a mass...

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Abstract

The present invention relates to a preparation method for a porphyra microcrystalline cellulose / nano platinum composite material, and belongs to the field of antimicrobial composite material preparation. The invention aims to solve the problems in a conventional platinum nano antimicrobial composite material preparation process that platinum nanoparticles are prone to agglomeration and cannot be uniformly dispersed on the surface of a material substrate, and thus an antibacterial effect is poor. The method disclosed by the present invention is characterized by comprising the steps of carrying out acid pickling on porphyra fiber and using calcium hypochlorite for bleaching, then carrying out second acid hydrolysis and alkaline leaching to prepare microcrystalline cellulose, taking ethylene glycol as a reducing agent and a reaction solvent to enable nucleation and growth of platinum nitrate nanoparticles, and uniformly distributing the nanoparticles on the surface of microcrystalline cellulose. Accordingly, the anti-bacterial performance is increased to 95% or higher.

Description

technical field [0001] The invention relates to a method for preparing a laver microcrystalline cellulose / nano-platinum composite material, which belongs to the field of antibacterial composite material preparation. Background technique [0002] Cellulose is an environmentally friendly polymer material. Using cellulose as a matrix to replace the current expensive synthetic polymer matrix, research on cellulose-based functional nanocomposites can significantly reduce the preparation cost of composite materials and promote the development of such materials. The popularization and application of organic antibacterial agents has poor thermal stability, easy decomposition, poor persistence, high toxicity, and harmful to human body when used for a long time. In order to overcome the shortcomings of organic antibacterial agents, people gradually turn their research direction to inorganic antibacterial agents. [0003] The existing inorganic antibacterial materials with excellent pe...

Claims

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Application Information

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IPC IPC(8): C08L1/04C08L23/12C08K3/08C08B15/02
CPCC08L23/12C08B15/02C08K3/08C08L1/04
Inventor 丁玉琴高力群
Owner 丁玉琴
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