Polyvinyl alcohol starch sustained-release film with controlled plant pesticide releasing performance and preparation method thereof

A technology for polyvinyl alcohol and plant pesticides, applied in the field of agricultural materials, can solve the problem of less sustained-release film, and achieve the effects of reducing the release rate, enriching the source of raw materials, and prolonging the efficacy period.

Inactive Publication Date: 2018-12-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few domestic studies on the combination of PVA and ST to prepare sustained-release films.

Method used

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  • Polyvinyl alcohol starch sustained-release film with controlled plant pesticide releasing performance and preparation method thereof
  • Polyvinyl alcohol starch sustained-release film with controlled plant pesticide releasing performance and preparation method thereof
  • Polyvinyl alcohol starch sustained-release film with controlled plant pesticide releasing performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Dried the stems and leaves of Eupatorium adenophorum, powdered them, weighed 15g of dry powder and wrapped them with filter paper, then added 100ml of absolute ethanol to heat and reflux for extraction for 12 hours. Rotate the extract under reduced pressure, dissolve the water phase, and centrifuge to obtain the supernatant, and dry it to constant weight to obtain the plant pesticide AIEAS.

[0046] (2) Weigh 0.1g AIEAS and dissolve it in 100ml methanol, then add 1g halloysite nanotubes, stir magnetically for 1h, vacuumize, deflate and stir, centrifuge to remove the supernatant, and blow dry at 60°C for 36h to obtain Halloysite nanotube-supported plant pesticides (HNTs-AIEAS).

[0047] (3) Mix 2 g of cornstarch with 18 g of deionized water, stir in a constant temperature water bath at 90°C at a speed of 500 rpm for 30 min to form a translucent paste.

[0048] (4) Weigh 8g of polyvinyl alcohol and dissolve it in 72g of deionized water in a 90°C water bath, then pour...

Embodiment 2

[0053](1) Dried the stems and leaves of Eupatorium adenophorum, powdered them, weighed 15g of dry powder and wrapped them with filter paper, then added 100ml of absolute ethanol to heat and reflux for extraction for 12 hours. Rotate the extract under reduced pressure, dissolve the water phase, and centrifuge to obtain the supernatant, and dry it to constant weight to obtain the plant pesticide AIEAS.

[0054] (2) Weigh 0.3g AIEAS and dissolve in 100ml methanol, then add 2g halloysite nanotubes, stir magnetically for 1.5h, vacuumize, deflate and stir, centrifuge to remove the supernatant, and dry at 60°C for 36h. Halloysite nanotube-loaded plant pesticides (HNTs-AIEAS).

[0055] (3) Mix 2 g of cornstarch with 18 g of deionized water, stir in a constant temperature water bath at 90°C at a speed of 500 rpm for 30 min to form a translucent paste.

[0056] (4) Weigh 8g of polyvinyl alcohol and dissolve it in 72g of deionized water in a 90°C water bath, then pour it into the transl...

Embodiment 3

[0061] (1) Dried the stems and leaves of Eupatorium adenophorum, powdered them, weighed 15g of dry powder and wrapped them with filter paper, then added 100ml of absolute ethanol to heat and reflux for extraction for 12 hours. Rotate the extract under reduced pressure, dissolve the water phase, and centrifuge to obtain the supernatant, and dry it to constant weight to obtain the plant pesticide AIEAS.

[0062] (2) Weigh 0.5g AIEAS and dissolve it in 100ml methanol, then add 3g halloysite nanotubes, stir magnetically for 1h, vacuumize, deflate and stir, centrifuge to remove the supernatant, and dry at 80°C for 24h to obtain Halloysite nanotube-supported plant pesticides (HNTs-AIEAS).

[0063] (3) Mix 2 g of cornstarch with 18 g of deionized water, stir in a constant temperature water bath at 90°C at a speed of 500 rpm for 30 min to form a translucent paste.

[0064] (4) Weigh 8g of polyvinyl alcohol and dissolve it in 72g of deionized water in a 90°C water bath, then pour it i...

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Abstract

The invention discloses a polyvinyl alcohol starch sustained-release film with controlled plant pesticide releasing performance and a preparation method thereof, belonging to the field of agriculturalmaterials. A plant pesticide used in the invention is the active ingredient (AIEAS) of Eupatorium adenophorum; and the basic skeleton structure of the polyvinyl alcohol starch sustained-release filmis formed of polyvinyl alcohol, corn starch and AIEAS-loaded halloysite nanotubes. Glycerol is added as a plasticizer to impart certain toughness to the sustained-release film. Glyceryl stearate is added as a defoaming agent to eliminate bubbles generated during film formation. A pasty mixed liquid which has been uniformly mixed is poured into a glass mold for molding, and then drying and film peeling are carried out so as to obtain polyvinyl alcohol starch sustained-release film with good controlled plant pesticide releasing performance. The PVA / ST sustained-release film of the invention hassustained release / controlled release performance and biodegradability; raw materials are widely available and low in price; and the application range of Eupatorium adenophorum is expanded, and a new path for environmental protection is opened up.

Description

technical field [0001] The invention belongs to the field of agricultural materials, and in particular relates to a polyvinyl alcohol starch slow-release film with plant pesticide controlled release performance and a preparation method thereof. Background technique [0002] Traditional chemical pesticides can effectively control weeds and pests, but the potential runoff and leaching of these toxic compounds in the soil will cause waste of resources and environmental pollution, resulting in a large amount of harmful residues in crops, endangering human health, which limits the use of chemical pesticides Applications. Therefore, reducing the toxicity of pesticides and improving the application of pesticide technology have gradually attracted attention. Eupatorium adenophorum spreng (EAS) is an invasive weed with unique allelopathic effects, and its secondary metabolites have insecticidal, antifeedant, flinching and bacteriostatic effects. Therefore, it can be used as a raw m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L3/02C08K13/04C08K5/053C08K5/103C08K7/26C08J5/18A01N31/04A01N45/00
CPCA01N31/04A01N45/00C08J5/18C08J2329/04C08J2403/02C08K5/053C08K5/103C08K7/26C08K13/04C08K2201/011
Inventor 贾志欣曾雪淇张清仲贾徳民
Owner SOUTH CHINA UNIV OF TECH
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