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PVA (polyvinyl alcohol)/starch slow release thin film with herbicide controlled-release property and preparation method thereof

A herbicide and slow-release technology, which is applied in the field of PVA/starch slow-release film and its preparation, can solve the problems of slow release of pesticides and poor rain resistance, and achieve the effect of prolonging the drug effect period and reducing the release rate

Inactive Publication Date: 2017-06-20
SOUTH CHINA UNIV OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the slow-release pesticide prepared by this method can be biodegradable and has no pollution to the environment, the rain resistance of this slow-release pesticide is poor, and it is difficult to achieve the purpose of slowly releasing pesticide under rainy weather conditions.

Method used

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  • PVA (polyvinyl alcohol)/starch slow release thin film with herbicide controlled-release property and preparation method thereof
  • PVA (polyvinyl alcohol)/starch slow release thin film with herbicide controlled-release property and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Dissolve 0.2 g of atrazine in methanol, add 1.8 g of montmorillonite, stir for 48 hours, centrifuge to remove the supernatant, and vacuum dry the product at 50°C for 16 hours to obtain atrazine-loaded montmorillonite-loaded Herbicides, spare.

[0044] In a 250ml flask, add 5g of cornstarch and 45g of deionized water, stir at 80°C at a speed of 650rpm for 1h to form a paste. In a second flask was added 5 g of polyvinyl alcohol dissolved in 45 g of deionized water (80 °C water bath).

[0045] Pour the mixed solution in the second flask into the first flask, then add 2g of glycerol and 0.3g of glyceryl monostearate to the mixed solution, mix and stir at a speed of 300rpm for 1h, and then add the above-mentioned The montmorillonite-loaded herbicide loaded with atrazine was stirred for 5 hours until a uniform viscous substance was obtained.

[0046] Spread the prepared viscous evenly on a dry and clean mold to form a liquid layer with uniform thickness and smooth surface, ...

Embodiment 2

[0048] Dissolve 0.05g of atrazine in methanol, then add 0.5g of montmorillonite, stir for 24 hours, centrifuge to remove the supernatant, and vacuum dry the product at 40°C for 24 hours to obtain atrazine-loaded montmorillonite-loaded Herbicides, spare.

[0049] In a 250ml flask, add 2g of cornstarch and 18g of deionized water, stir at 70°C at a speed of 500rpm for 0.5h to form a paste. In a second flask, 8 g of polyvinyl alcohol was dissolved in 72 g of deionized water (70 °C water bath).

[0050]Pour the mixed solution in the second flask into the first flask, then add 1g of glycerol and 0.1g of glyceryl monostearate to the mixed solution, mix and stir at 200°C for 1h, then add the above-mentioned The montmorillonite-loaded herbicide loaded with 2,4-dichlorophenoxyacetic acid was stirred for 2 hours until a uniform viscous substance was obtained.

[0051] Spread the prepared viscous evenly on a dry and clean mold to form a liquid layer with uniform thickness and smooth sur...

Embodiment 3

[0053] Dissolve 0.4g of atrazine in ethanol, then add 3g of montmorillonite, stir for 72 hours, centrifuge to remove the supernatant, and vacuum dry the product at 60°C for 8 hours to obtain atrazine-loaded montmorillonite-loaded herbicide agent, spare.

[0054] In a 250ml flask, add 8g of cornstarch and 72g of deionized water, and stir at 90°C at a speed of 800rpm for 2h to form a paste. In a second flask was added 2 g of polyvinyl alcohol dissolved in 18 g of deionized water (90 °C water bath).

[0055] Pour the mixed solution in the second flask into the second flask, then add 3 parts of glycerol and 0.5 g of glyceryl monostearate to the mixed solution, mix and stir evenly, and mix and stir at a speed of 500 rpm for 0.5 h, then add the atrazine-loaded montmorillonite-loaded herbicide prepared above, and continue stirring for 4 h until a uniform viscous substance is obtained.

[0056] Evenly spread the prepared viscous material on a dry and clean mold to form a liquid laye...

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Abstract

The invention discloses a PVA (polyvinyl alcohol) / starch slow release thin film with a herbicide controlled-release property and a preparation method thereof, and belongs to the field of agricultural materials. The PVA / starch slow release thin film is of a basic framework structure formed by PVA, corn starch and an imvite forming film loading a weedicide. Propanetriol is added as a plasticizing agent, so that certain toughness is given to the film. Glycerin monostearate is added as a defoaming agent, so that air bubbles generated in the film forming process are eliminated. Finally, uniformly mixed pasty mixed liquid is poured into a mold for formation; constant temperature drying is performed in a drying box; after film uncovering, the PVA / starch slow release thin film with good herbicide controlled-release property is obtained. The PVA / starch slow release thin film has slow release / controlled-release property and biological degradability; the slow release speed of the slow release / controlled-release thin film can be freely adjusted according to user requirements, so that the requirements of various different users can be met.

Description

technical field [0001] The invention belongs to the field of agricultural materials, and in particular relates to a PVA / starch slow-release film with herbicide controlled-release performance and a preparation method thereof. Background technique [0002] Pesticide, a preparation used to control the growth of pests and weeds, is widely used to increase crop yields. However, the widespread use of pesticides has also caused serious ecological problems, such as water pollution, air pollution, and pesticide residues. For this reason, the development of high-efficiency agriculture and the reduction of the harm to the environment caused by the use of pesticides are topics of common concern to the international community. The controlled-release system of pesticides is gradually favored by researchers because of its economic and ecological advantages. The controlled-release system of pesticides can effectively control the release of active ingredients, prolong the efficacy period o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L3/02C08J5/18C08K13/06C08K9/12C08K3/34C08K5/053C08K5/103C08K5/3492A01N25/10A01N43/70A01P13/00
CPCA01N25/10A01N43/70C08J5/18C08J2303/02C08J2329/04C08L3/02C08L29/04C08L2201/06C08L2203/16C08K13/06C08K9/12C08K3/346C08K5/053C08K5/103C08K5/3492A01N2300/00
Inventor 贾志欣李群洋周向阳王松谢东贾德民罗远芳
Owner SOUTH CHINA UNIV OF TECH
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