A kind of bio-based slow and controlled release pesticide liquid mulch film and its preparation method and application

A technology of controlled-release pesticides and liquid mulch, applied in botany equipment and methods, chemicals for biological control, applications, etc., can solve the problem of soil heat preservation, insufficient water retention capacity, affecting the function of fertilizers and drugs, and the release of active ingredients Over-fast and other problems, to achieve slow and long-lasting biopesticide release ability, good water absorption and water retention, and shorten the cultivation period

Active Publication Date: 2021-11-19
ZHONGKAI UNIV OF AGRI & ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the liquid mulch film currently on the market is not mature enough, and there are still some shortcomings in terms of performance.
Such as: 1. After spraying, the film-forming property on the surface is poor, and the heat preservation and water retention capacity of the soil are relatively insufficient.
2. The function of liquid mulch film is relatively single. After spraying mulch film, it forms a film on the soil surface, and when fertilizers, herbicides and other reagents are subsequently applied, due to the barrier of mulch film, it will affect the function of fertilizers and drugs.
[0006] At the same time, pesticides also play an important role in the growth of crops, but their excessive use and residues have brought many impacts on the environment and human health
The traditional method of pesticide application is regular direct spraying, but factors such as photolysis, mineralization, and surface migration make pesticides have problems such as low effective utilization rate, rapid release of active ingredients, and short drug effect time, so as to realize the application of pesticides in the process of crop growth. The slow and lasting release and prolonging the drug effect time are of great significance to the growth of crops

Method used

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  • A kind of bio-based slow and controlled release pesticide liquid mulch film and its preparation method and application
  • A kind of bio-based slow and controlled release pesticide liquid mulch film and its preparation method and application
  • A kind of bio-based slow and controlled release pesticide liquid mulch film and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A preparation method for a xylan-based slow- and controlled-release pesticide liquid mulch film, comprising the following steps:

[0047] (1) At room temperature, add 1 g of xylan to 19 g of water at a speed of 500 r / min to obtain a uniform dispersion. Immediately add 0.1 g of the oxidant sodium periodate, place it in a microwave reactor, and wrap it with tinfoil, set the microwave radiation power to 50W, react at 25°C for 12 hours, dialyze with a 5000 molecular weight dialysis bag, and freeze-dry to obtain oxidized wood polysaccharides.

[0048] (2) Disperse 0.5 g of oxidized xylan in step (1) in methanol, add 1 g of chitosan, stir and react for 6 hours at 80 ° C, dialyze with a 10,000 molecular weight dialysis bag, and freeze-dry to obtain oxidized polysaccharide graft things.

[0049] (3) Dissolving 0.5g amphiphilic block polymer polyethylene glycol monomethyl ether-polycaprolactone in dimethyl sulfoxide, adding 1.5g of biopesticide avermectin, at 60°C, Ultrasonic...

Embodiment 2

[0053] The preparation method of ethyl cellulose-based slow and controlled release pesticide liquid mulch film comprises the following steps:

[0054] (1) At room temperature, add 3 g of ethyl cellulose into 21 g of water at a speed of 550 r / min to obtain a uniform dispersion. Immediately add 3g of oxidizing agent ortho-periodic acid, put it in a microwave reactor, and wrap it with tinfoil paper, set the microwave radiation power to 350W, react at 80°C for 4h, dialyze with a 5000 molecular weight dialysis bag, and freeze-dry to obtain oxidized ethyl fiber white.

[0055] (2) Disperse 1 g of oxidized ethyl cellulose in step (1) in tert-butanol, add 5 g of inulin lauryl carbamate, stir and react for 10 h at 60 ° C, dialyze with a 10,000 molecular weight dialysis bag, and freeze Dry to obtain oxidized polysaccharide grafts.

[0056] (3) Dissolve 0.5 g of the amphiphilic block polymer polyethylene glycol-polylactide in dimethyl sulfoxide, add 0.5 g of the biopesticide metalaxyl,...

Embodiment 3

[0060] The preparation method of sodium alginate-based slow and controlled release pesticide liquid mulch film comprises the following steps:

[0061] (1) At room temperature, add 1.5 g of sodium alginate to 18 g of tert-butanol at a speed of 600 r / min to obtain a uniform dispersion. Immediately add 0.6g of a mixture of di-ortho-sodium periodate and barium periodate with a mass ratio of 1:2, place it in a microwave reactor, wrap it with tinfoil paper, set the microwave radiation power to 200W, react at 100°C for 30h, and use 5000 molecular weight dialysis bag dialysis, freeze-drying to obtain oxidized sodium alginate.

[0062] (2) Disperse 1 g of oxidized sodium alginate in step (1) in methanol, add 10 g of collagen, stir and react at 90 ° C for 1 hour, dialyze with a 10,000 molecular weight dialysis bag, freeze-dry, and store for later use to obtain oxidized sodium alginate graft thing.

[0063] (3) Dissolve 1 g of the amphiphilic block polymer polymethyl methacrylate-polya...

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Abstract

The invention discloses a bio-based slow-controlled release pesticide liquid mulch film and its preparation method and application, and relates to the technical field of natural polymer materials. In the present invention, the polysaccharide is firstly dispersed in a solvent, and oxidized by an oxidant to obtain an oxidized polysaccharide; the oxidized polysaccharide is reacted with an amino group-containing hydrophilic polymer to obtain an oxidized polysaccharide graft; at the same time, the amphiphilic Dissolve the non-toxic block polymer in the solvent, add biopesticides, and embed in ultrasound to obtain drug-loaded microspheres; finally, blend the prepared oxidized polysaccharide grafts with drug-loaded microspheres, add water-absorbing polymer and plasticizer agent, and react to obtain a bio-based slow-release pesticide liquid mulch film. The bio-based slow and controlled-release pesticide liquid mulch film of the present invention has good film-forming properties, remarkable heat preservation, water retention and heat preservation and moisture conservation capabilities for soil, and has good mechanical properties. Manufacturing process requirements.

Description

technical field [0001] The invention relates to the technical field of natural polymer materials, in particular to a bio-based slow-release pesticide liquid mulch film and its preparation method and application. Background technique [0002] Covering cultivation technology has a greater role in promoting agricultural production. It can increase temperature and moisture, retain water, reduce pests and diseases, promote seed germination, and increase crop yield. At present, the mulching materials used in farmland mainly include: plastic mulch, straw and chemical mulching agents. Among them, plastic mulch is the most widely used mulch in the agricultural field. It has the advantages of increasing temperature and moisture, retaining water, and increasing crop yield. However, the natural degradation of plastic mulch is poor, and the residue will continue to accumulate in the soil, which will destroy the soil structure and cause white pollution. , seriously damage the soil qualit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N25/28A01N25/18A01N43/90A01N37/46A01N63/30A01N65/12A01P1/00A01P3/00A01P17/00A01G13/02A01G22/40A01G22/15
CPCA01G13/0262A01N25/18A01N25/28A01N37/46A01N43/90A01N65/00A01N65/12A01G22/15A01G22/40A01N63/30Y02A50/30
Inventor 张雪琴肖乃玉张洁梅徐小云罗文翰钟乐翟万京
Owner ZHONGKAI UNIV OF AGRI & ENG
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