Preparation method of sepiolite loaded chitosan-silver antibacterial powder

A technology for loading chitosan and sepiolite, applied in botany equipment and methods, fungicides, chemicals for biological control, etc., can solve the problem of affecting the mass production of nano-silver powder, affecting the appearance and performance of antibacterial agents, and the process flow Complicated and other problems, to achieve excellent antibacterial effect, reduce agglomeration problems, and reduce costs

CN109349272APending Publication Date: 2019-02-19XIANGTAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-02-19

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Abstract

The invention discloses a preparation method of sepiolite loaded chitosan-silver antibacterial powder. The preparation method includes the steps: mixing chitosan acetate solution and silver nitrate solution to form a chitosan-silver antibacterial agent; mixing the chitosan-silver antibacterial agent and the sepiolite to obtain the sepiolite loaded chitosan-silver antibacterial powder. According tothe method, natural antibacterial agent chitosan and silver nitrate are combined, synergistic effects between the chitosan and the silver nitrate are achieved, the antibacterial performance of the sepiolite is obviously enhanced, the chitosan is introduced, the dispersion degree of silver in the sepiolite is enhanced by the aid of viscosity and dispersing performance of the chitosan, and aggregation of silver is reduced. According to the prepared chitosan-silver nano-scale antibacterial agent, the usage amount of the chitosan is less, parts of silver nitrate is replaced, the antibacterial performance is enhanced, the usage amount of the silver nitrate is reduced, production cost is reduced, low-purity sepiolite is used, purification of the sepiolite is omitted, the chitosan-silver antibacterial agent can be sufficiently loaded by the low-purity sepiolite, and excellent antibacterial effects can be achieved.
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Description

technical field

[0001] The invention relates to the field of material preparation, in particular to a method for preparing sepiolite-loaded chitosan-silver antibacterial powder. Background technique

[0002] Sepiolite is a fibrous hydrous magnesium silicate with a high specific surface area (theoretical specific surface area can reach 900m 2 / g), large porosity, good thermal stability, good adsorption (recognized as the clay mineral with the strongest adsorption capacity) and low price. It is mainly used in coatings, papermaking, paints, ceramics, refractory materials, and industrial plastics. , graphite, cosmetics, food and drug, anti-mold and antibacterial and other important fields. Due to the widespread existence of microorganisms in the human living environment, their reproductive ability is strong. If they are not controlled, they will seriously affect the health of human life. Combined with sepiolite, a new type of functional material with the function of killing or...

Examples

Embodiment 1

[0032] A kind of preparation method of sepiolite loaded chitosan-silver antibacterial powder

[0033] (1) sepiolite pretreatment: purity is 30% sepiolite grinding fully, crosses 200 order separation sieves;

[0034] (2) 0.5g chitosan is dissolved in 100ml, mass fraction is in the acetic acid solution of 1%, is mixed with the chitosan solution of dark yellow 5g / L, configures the colorless silver nitrate solution of 100ml, 0.008mol / L simultaneously;

[0035] (3) Measure 10ml, 0.008mol / L silver nitrate solution, add it dropwise to 10ml, 5g / L chitosan acetic acid solution, pH=4.0, and react for 5 hours with magnetic stirring in an oil bath at 85°C. The polysaccharide-silver composite antibacterial agent is reddish brown;

[0036] (4) Add the chitosan-silver antibacterial agent formed in the step (3) dropwise to the 30% sepiolite powder gained in the step (1), and immerse with magnetic stirring in an oil bath at 85° C. for 21 hours;

[0037] (5) Filter the mixed material in step ...

Embodiment 2

[0040] A kind of preparation method of sepiolite loaded chitosan-silver antibacterial powder

[0041] (1) sepiolite pretreatment: purity is 30% sepiolite grinding fully, crosses 200 mesh separation sieves;

[0042] (2) 1g chitosan is dissolved in 100ml, mass fraction is in the acetic acid solution of 1%, is mixed with the chitosan solution of dark yellow 10g / L, configures the colorless silver nitrate solution of 100ml, 0.008mol / L simultaneously;

[0043] (3) Measure 10ml, 0.008mol / L silver nitrate solution, add it dropwise to 10ml, 10g / L chitosan acetic acid solution, pH=4.0, stir in an oil bath at 85°C for 5 hours, and at the end of the reaction, shell The polysaccharide-silver composite antibacterial agent presents a reddish-brown liquid;

[0044] (4) Add the chitosan-silver antibacterial agent formed in the step (3) dropwise to the 30% sepiolite powder in the step (1), and immerse with magnetic stirring in an oil bath at 85° C. for 21 hours;

[0045](5) Filter the mixed m...