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Preparation method and application of efficient antibacterial bactericide for melons, fruits and vegetables

A fungicide and vegetable technology, applied in the field of preparation and application of agricultural and sideline products, can solve the problems of delayed effect, high price, and less application of natural antibacterial agents, and achieve the effects of strong inhibition, low production cost, and low residual rate

Inactive Publication Date: 2020-02-28
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the limitation of antibacterial effect, stability and price, the application of natural antibacterial agents is less
Inorganic antibacterial agents have the advantage of good heat resistance, but their prices are high and there is a slow antibacterial effect, and their market is gradually shrinking at present

Method used

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  • Preparation method and application of efficient antibacterial bactericide for melons, fruits and vegetables
  • Preparation method and application of efficient antibacterial bactericide for melons, fruits and vegetables
  • Preparation method and application of efficient antibacterial bactericide for melons, fruits and vegetables

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 10 grams of polyvinylamine into the reaction kettle at normal temperature, then add 1000 milliliters of water, mix well, add 10 grams of difluorobenzoic acid and continue stirring. After 50 minutes, raise the temperature to 40°C, add 0.1M dilute hydrochloric acid to adjust the pH value of the solution to 6.0 and slowly add 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride under nitrogen protection 10 grams, after stirring for 3 hours, cooling and discharging. The reaction solution was separated and purified through a dialysis membrane for 3 days. After drying, 0.2 g of lanthanum trichloride was added to the product and stirred evenly to obtain the final product 1.

Embodiment 2

[0022] Add 10 grams of polyvinylamine into the reaction kettle at normal temperature, then add 1000 milliliters of water and 100 milliliters of ethanol, mix well, add 5 grams of difluorobenzoic acid and continue stirring. After 90 minutes, the temperature was raised to 65°C, acetic acid was added to adjust the pH value of the solution to 4.0 and 18 grams of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride was slowly added under nitrogen protection, After stirring for 4 hours, cool down and discharge. The reaction solution was separated and purified through a 2-day dialysis membrane. After drying, 0.4 g of neodymium chloride was added to the product and stirred evenly to obtain the final product 2.

Embodiment 3

[0024] Add 10 grams of polyvinylamine in reactor at normal temperature, then add 800 milliliters of water and 25 milliliters of methanol, add 4 grams of difluorobenzoic acid after mixing and continue to stir. After 60 minutes, the temperature was raised to 35°C, 0.1M oxalic acid was added to adjust the pH value of the solution to 5.0, and 5 g of diisopropylcarbodiimide was slowly added under the protection of nitrogen, and after stirring for 2 hours, the temperature was lowered and discharged. The reaction solution was separated and purified by the dialysis membrane of 4 days time, after drying, 0.6g cerium tetrachloride was added in the product and stirred evenly and final product 3 could be obtained.

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Abstract

The invention discloses a preparation method and application of an efficient antibacterial bactericide for melons, fruits and vegetables. The antibacterial bactericide is a polyvinylamine polymer product grafted with difluorobenzene functional groups. The preparation method comprises the following steps: (A) fully dissolving 1 part by weight of polyvinylamine in 50-300 parts by weight of a solventat normal temperature, and adding 0.2-2 parts by weight of difluorobenzoic acid for complete dissolution; (B) adding 0.2-2.0 parts by weight of a coupling agent in the presence of nitrogen, reactingfor 1-6 hours at 20-70 DEG C, and controlling the pH value of an obtained system by using an acidity and alkalinity regulator; (C) separating an obtained reaction solution in a dialysis bag for 1-5 days, and drying to obtain a purified product; (D) adding 0.01-0.1 part by weight of rare earth as a synergist, and uniformly mixing to obtain a final product. The efficient antibacterial bactericide can be used for antibiosis and sterilization of melons, fruits and vegetables, has remarkable antibiosis and sterilization effects on enterobacter and gram-negative bacteria, has a sterilization rate of100.0% when the concentration of the efficient antibacterial bactericide is 1-10 mg / L, has a low residual rate, and does not cause threat on the health of people and livestock.

Description

technical field [0001] The invention relates to the field of preparation and application of agricultural and sideline products, in particular to a preparation method and application of a polyvinylamine antibacterial and bactericide containing difluorobenzene functional groups. The organic polymer antibacterial and bactericide can be used as a high-efficiency antibacterial and bactericidal agent for fruits and vegetables. Background technique [0002] With the gradual improvement of people's living standards, people's requirements for hygiene and health are getting higher and higher, especially for the consumption of agricultural products. Antibacterial and fungicide is a common agricultural by-product, which can inhibit the growth of microorganisms and eliminate microorganisms, so as to ensure the quality of agricultural products. Existing antibacterial agents can be divided into three categories: natural antibacterial agents, inorganic antibacterial agents and organic antib...

Claims

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Application Information

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IPC IPC(8): A01N37/18A01N59/16A01P3/00A01P1/00
CPCA01N37/18A01N59/16
Inventor 付贤树叶子弘俞晓平崔海峰张雅芬夏文强
Owner CHINA JILIANG UNIV
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