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Preparation method of modified material of lignosulfonate and application of modified material in nano pesticide

A technology of lignosulfonate and modified materials, which is applied in the field of preparation of hydrophobic modified nanomaterials, can solve the problems of slow release and low photodegradation resistance, uneven particle distribution, complex preparation process, etc., and achieve good biological The effects of degradability, simple process, and wide range of sources

Pending Publication Date: 2022-05-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this scheme directly uses lignosulfonate without modification, and the process is relatively cumbersome. The crosslinking agents p-phenylenediamine and m-phenylenediamine used have been listed as carcinogens by the World Health Organization, which are highly toxic and poor in environmental protection; Invention patent CN108739807B describes a nano-microcapsule preparation prepared with a polymer formed of vegetable oleic acid-chitosan-based polyol and polyisocyanate as the wall material and pesticide as the core material. The particle size of the preparation has reached the nanometer level. However, in some reports, isocyanates have problems interacting with pesticides containing hydroxyl groups in the formula
[0006] The currently disclosed nano-pesticides still have disadvantages such as complex preparation process, high cost, difficult degradation in the environment, uneven particle distribution, slow release and low resistance to photodegradation. Therefore, it is necessary to reduce material costs and develop a simple process. , environmentally friendly, lignosulfonate hydrophobically modified nanomaterials that can prepare new nano-pesticides with long duration and slow degradation

Method used

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  • Preparation method of modified material of lignosulfonate and application of modified material in nano pesticide
  • Preparation method of modified material of lignosulfonate and application of modified material in nano pesticide
  • Preparation method of modified material of lignosulfonate and application of modified material in nano pesticide

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Experimental program
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Effect test

Embodiment 1

[0051] Embodiment 1, the preparation of benzoic acid-esterified sodium lignosulfonate (the weight ratio of sodium lignosulfonate to benzoic anhydride is 1:2):

[0052] Weigh 1g of sodium lignosulfonate (LS) into 10ml of N,N-dimethylformamide (DMF), and stir in an oil bath at 90°C until the sodium lignosulfonate is completely dissolved;

[0053] After cooling down to room temperature, 2 g of benzoic anhydride (Bma) and 1 equivalent (relative to benzoic anhydride) of triethylamine (TEA) were added, and the reaction was stirred at 60° C. for 24 h.

[0054] Centrifuge (8000r / min, 5min) to get the supernatant; Then, pour into 200ml of isopropanol and centrifuge to obtain a precipitate, wash the precipitate twice with isopropanol (when cleaning each time, the consumption of isopropanol is 200ml), Put it into a vacuum drying oven, and dry it under vacuum at 40° C. (dry to constant weight) to obtain sodium benzoate lignosulfonate (ie, sodium benzoate lignosulfonate nanocarrier). The ...

Embodiment 2

[0055] Embodiment 2, the amount of benzoic anhydride in embodiment 1 is changed from " 2g " to " 3g ", and triethylamine is still 1 equivalent (relative to benzoic anhydride); All the other are equal to embodiment 1. The particle diameter of the obtained benzoated sodium lignosulfonate nano-carrier is about 100 nm.

Embodiment 3

[0056] Embodiment 3, the amount of benzoic anhydride in embodiment 1 is changed from " 2g " to " 5g ", and triethylamine is still 1 equivalent (relative to benzoic anhydride); All the other are equal to embodiment 1. The particle diameter of the obtained benzoated sodium lignosulfonate nano-carrier is about 100 nm.

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Abstract

The invention discloses a preparation method of a lignosulfonate modified material, which comprises the following steps: dissolving lignosulfonate in a solvent, then adding triethylamine and an aliphatic / aromatic substance, reacting for 24 + / -2 hours under a stirring condition, centrifuging to take supernate, adding isopropanol into the supernate to obtain a precipitate, and carrying out vacuum drying on the precipitate to obtain the lignosulfonate modified material. The invention also provides an application of the modified material of lignosulfonate, and the modified material of lignosulfonate is used as a carrier material to load a pesticide active compound to prepare a nano pesticide.

Description

technical field [0001] The invention relates to the technical field of preparation and application of agricultural nanomaterials, in particular to the preparation and application of a hydrophobic modified nanomaterial of lignosulfonate. Background technique [0002] In agriculture, more than 4 million tons of pesticides are used worldwide every year to protect crops. However, in recent years, the abuse and high residues of pesticides have brought a huge burden to the environment and human health. These serious hazards are not only due to the inefficiency of pesticides, but also due to the large use of organic solvents and surfactants in conventional formulations. Therefore, it is necessary to use more efficient and green pesticides to protect crops and promote the sustainable development of agriculture. Compared with traditional pesticides, nano-pesticides have unique advantages and are considered to have broad application prospects. [0003] Nano-pesticide is a kind of p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00A01N25/10A01N43/653A01N25/22A01P3/00
CPCC08H6/00A01N25/10A01N43/653A01N25/22Y02A50/30
Inventor 赵金浩张家栋梁文龙李贤宾于斌程敬丽
Owner ZHEJIANG UNIV