Preparation method of bentonite-based durable slow-release antibacterial agent

A technology of bentonite and slow-release type is applied in the field of preparation of bentonite-based durable slow-release antibacterial agent, which can solve the problems of low durability, small spacing between natural bentonite layers, low loading capacity, etc. The process is simple and easy to obtain, the effect of low cost

Inactive Publication Date: 2017-01-04
吴迪
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the current traditional bentonite-based inorganic antibacterial agent, due to the weak binding of silver ions between the bentonite layers, it is easy to dissociate and be reduced, and because the natural bentonite layer spacing is small, the loading capacity is low, resulting in poor antibacterial performance, low durability and affecting the appearance. , providing a preparation method of bentonite-based durable slow-release antibacterial agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] Weigh 400g of bentonite, pour it into 3L of deionized water and transfer it to an ultrasonic oscillator, immerse it under 200W ultrasonic vibration for 5h, then transfer it to a horizontal centrifuge, centrifuge at 4000r / min for 10min, and separate the lower sediment; The obtained precipitate is put into a liquid nitrogen quick-freezer for quick freezing for 1 minute, and after it is taken out, it will naturally return to room temperature. After drying, repeat the steps of soaking, quick freezing and drying 3 times to obtain a broad layer of bentonite; Put the layer of bentonite into a dialysis bag with a molecular weight cut-off of 500 and seal the mouth of the bag. Put the dialysis bag into a ceramic fermentation tank, and then add natto twice the total mass of the wide layer of bentonite to the tank. After the dialysis bag is buried, continue to the tank. Inject deionized water into the dialysis bag and natto until the dialysis bag and natto are completely immersed. Af...

example 2

[0020] Weigh 450g of bentonite, pour it into 4L deionized water and transfer it to an ultrasonic oscillator, immerse it in 250W ultrasonic vibration for 6h, then transfer it to a horizontal centrifuge, centrifuge at 4500r / min for 13min, and separate the lower sediment; The obtained precipitate is put into a liquid nitrogen quick-freezer for 2 minutes, and then it is taken out and allowed to return to room temperature naturally. After drying, repeat the steps of soaking, quick-freezing, and drying 4 times to obtain a broad layer of bentonite; Put the layer of bentonite into a dialysis bag with a molecular weight cut-off of 500 and seal the mouth of the bag, put the dialysis bag into a ceramic fermentation tank, and then add natto 3 times the total mass of the wide layer of bentonite to the tank. Inject deionized water into the dialysis bag and natto until the dialysis bag and natto are completely immersed. After sealing the mouth of the tank, put the fermentation tank in a 40℃ th...

example 3

[0023] Weigh 500g bentonite, pour it into 5L deionized water and transfer it to an ultrasonic oscillator, immerse it in a 300W ultrasonic vibration for 7h, then transfer it to a horizontal centrifuge, centrifuge at 5000r / min for 15min, and separate the lower sediment; Put the obtained precipitate into a liquid nitrogen quick-freezer for 2 minutes, and let it naturally return to room temperature after taking it out. After drying, repeat the steps of soaking, quick-freezing and drying 5 times to obtain a broad layer of bentonite; Put the layer of bentonite into a dialysis bag with a molecular weight cut-off of 500 and seal the mouth of the bag, put the dialysis bag into a ceramic fermentation tank, and then add natto 3 times the total mass of the wide layer of bentonite to the tank. Inject deionized water into the dialysis bag and natto until the dialysis bag and natto are completely immersed. After sealing the mouth of the tank, put the fermentation tank in a 45℃ thermostat, keep...

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Abstract

The invention relates to a preparation method of a bentonite-based durable slow-release antibacterial agent and belongs to the technical field of preparation of antibacterial agents. According to the method, natural bentonite is soaked in deionized water and quickly frozen with liquid nitrogen such that water permeating in the bentonite is iced, the water has increased volume upon icing, interlayer spacing of the bentonite is enlarged, the bentonite with the enlarged interlayer spacing is then mixed with natto, thick amino acid material on the surface of the natto is used to modify the interlayer of the bentonite under action of microorganisms, interlayer active groups are added to the bentonite, an active adsorption site is provided for silver ions, binding degree between the silver ions and the bentonite is increased, the heated bentonite is finally poured into calcium bicarbonate solution, the calcium bicarbonate is heated to decompose and produce calcium carbonate that covers the surface of the bentonite, freeing of the silver ions is further avoided, and the problem is solved that as the interlayer silver ions in the natural bentonite having weak binding are easily freed and reduced and the natural bentonite has low loading capacity, poor antibacterial property and low durability are caused.

Description

Technical field [0001] The invention relates to a preparation method of a bentonite-based durable sustained-release antibacterial agent, belonging to the technical field of antibacterial agent preparation. Background technique [0002] Using silver, copper, zinc and other metals and photocatalytic active oxides (such as Ti0 2 ) Antibacterial ability, through certain methods (such as physical adsorption, ion exchange, etc.), to fix silver, copper, zinc and other metals or photocatalytic active oxides on inorganic carriers (usually porous materials, such as zeolite, silica gel, etc.) The surface is made into an antibacterial agent, and then it is added to the corresponding product to obtain an antibacterial material that is an inorganic antibacterial agent. Inorganic antibacterial agents and their products (especially silver and Ti0 2 :Photocatalyst antibacterial agent and its products) has become a research hotspot due to its safe, reliable, stable and long-lasting antibacterial p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/14
CPCC09D5/14
Inventor 吴迪林茂平
Owner 吴迪
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