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A kind of lignin/silver compound antibacterial agent and its preparation method and application

A compound antibacterial agent and lignin technology, which is applied in the direction of botany equipment and methods, applications, biocides, etc., can solve the problems of short duration of efficacy, poor stability of silver-based antibacterial agents, and high cost, and achieve strong antioxidant capacity, Improved antibacterial ability and low cost effect

Active Publication Date: 2019-10-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the disadvantages and deficiencies of silver-based antibacterial agents in the above-mentioned prior art, such as poor stability, short duration of effect, and high cost, the primary purpose of the present invention is to provide a preparation method of a lignin / silver composite antibacterial agent

Method used

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  • A kind of lignin/silver compound antibacterial agent and its preparation method and application
  • A kind of lignin/silver compound antibacterial agent and its preparation method and application
  • A kind of lignin/silver compound antibacterial agent and its preparation method and application

Examples

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Effect test

Embodiment 1

[0039] Take 100 parts by weight of wheatgrass alkali lignin solid and disperse it in water, prepare a suspension with a mass percentage concentration of 20%, adjust the pH value to 9 with a NaOH aqueous solution with a mass concentration of 20%, heat to 50°C, and add 5 parts by weight of Sodium chloroacetate, reacted at 50°C for 1h, then added 20 parts by weight of 3-chloro-2-hydroxypropyltrimethylammonium chloride, and continued to react at 50°C for 4h to obtain an amphoteric lignin solution, using a mass fraction of 10% nitric acid aqueous solution to adjust the pH to 8, add 0.5 parts by weight of silver nitrate, absorb in the dark for 1 hour, use 10% nitric acid aqueous solution to adjust the pH to 6, dry the precipitate after aging and separation to obtain a lignin / silver compound Antibacterial agents.

Embodiment 2

[0041] Take 100 parts by weight of bagasse alkali lignin solids and disperse them in water, prepare a suspension with a concentration of 30% by weight, adjust the pH value to 10 with a NaOH aqueous solution with a mass concentration of 20%, heat to 60°C, and add 10 parts by weight of Bromoacetic acid, reacted at 60°C for 2h. Then add 30 parts by weight of 2,3-epoxypropyltrimethylammonium chloride, react at 60°C for 3 hours to obtain an amphoteric lignin solution, adjust the pH to 7 with a 10% aqueous nitric acid solution by mass fraction, add 3 parts by weight 100% silver bromide, absorb for 2 hours in the dark, adjust the pH to 3 with 10% nitric acid aqueous solution, age and separate, and dry the precipitate to obtain a lignin / silver composite antibacterial agent.

Embodiment 3

[0043] Take 50 parts by weight of bamboo pulp alkali lignin and 50 parts by weight of reed alkali lignin solids and disperse them in water, prepare a suspension with a concentration of 40% by weight, and adjust the pH value to 11 with a NaOH aqueous solution with a mass concentration of 20%. Heat to 75°C, add 15 parts by weight of chloroacetic acid, react at 75°C for 2 hours, then add 20 parts by weight of 3-chloro-2-hydroxypropyltrimethylammonium chloride and 20 parts by weight of 2,3-cyclo Oxypropyltrimethylammonium chloride was reacted at 75°C for 2 hours to obtain an amphoteric lignin solution, and then an aqueous solution of nitric acid with a mass fraction of 10% was added to adjust the pH to 6, and 6 parts of silver nitrate was added to absorb for 3 hours in the dark. Using 10% nitric acid aqueous solution to adjust the pH to 5, aging and separating, and drying the precipitate to obtain the lignin / silver composite antibacterial agent.

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Abstract

The invention discloses a lignin / silver composite antibacterial agent, and a preparation method and application thereof, belonging to the technical field of preparation of antibacterial agents. The method comprises the following steps: reacting alkali lignin with a carboxylation reaction to introduce an anionic functional group, and then adding a cationization reagent to introduce a cationic functional groups so as to obtain an anionic-cationic amphoteric lignin solution; then adjusting a system to allow the system to be negatively charged, adding a silver salt and carrying out light-tight absorption so as to obtain a lignin / silver mixed solution; and then adjusting the system to allow the system to be positively charged, and successively carrying out aging, separation and drying so as to obtain the lignin / silver composite antibacterial agent. According to the method, lignin is subjected to chemical modification, and pH value regulation is carried out so as to allow the lignin to have properties like an anionic-cationic amphoteric polymer, so the prepared lignin / silver composite antibacterial agent has a positively-charged surface, substantially enhanced bactericidal ability, long-lasting bactericidal efficacy and high compatibility with high polymers; and when the lignin / silver composite antibacterial agent is applied to preparation of antibacterial materials, the problems of poor stability, short duration of bactericidal efficacy and high cost of conventional silver-series antibacterial agents are overcome.

Description

technical field [0001] The invention belongs to the technical field of preparation of antibacterial agents, in particular to a lignin / silver composite antibacterial agent and its preparation method and application. Background technique [0002] With the development of social economy and the improvement of living standards, people have a higher awareness and demand for health and safety and food safety. Therefore, materials with antibacterial and bactericidal functions have attracted more and more attention. The development and production of bactericidal materials Has become a new industry. Silver-based antibacterial agents are representative of inorganic antibacterial agents. They have the characteristics of broad-spectrum, high efficiency, long-lasting, and no drug resistance, and are widely used in commercially available antibacterial agents. However, the stability of silver salt antibacterial agents is poor. When exposed to light or stored for a long time, they are easy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08L63/00C08L97/00C08K3/08C09D5/14A01N59/16A01N25/10A01P1/00
Inventor 邱学青杨东杰李圆圆楼宏铭庞煜霞钱勇刘伟峰易聪华
Owner SOUTH CHINA UNIV OF TECH
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