Modified halloysite nanotube composite slow release pesticide and preparation method thereof

A technology of halloysite nanotubes and slow-release pesticides, applied in the fields of botanical equipment and methods, chemical instruments and methods, agriculture, etc., can solve the problems of poor slow-release and small drug loading, and achieve low cost and energy saving. , the effect of simple preparation process

Inactive Publication Date: 2016-12-14
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is to provide a modified halloysite nanotube composite slow-release pesticide and its preparation method, which uses natural nano-tubular material halloysite as the slow-release carrier, and utilizes its natural hollow tubular structure, Encapsulating pesticides in it to make slow-release pesticides can not only increase the drug loading, improve the slow-release performance, and prolong the drug effect time, but also overcome the small drug-loading and slow-release effects of clay carriers in the prior art. Disadvantages of poor sex

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  • Modified halloysite nanotube composite slow release pesticide and preparation method thereof

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Effect test

Embodiment 1

[0021] Preparation of halloysite loaded acetochlor sustained-release pesticide

[0022] (1) Weigh 100g of halloysite, slowly add it to 500mL of water under mechanical stirring, continue to add 1000mL of water after stirring for 10 minutes, stir for another 30 minutes and let it stand for 1 hour, discard the lower layer of sand and stones and take the upper layer of slurry, adjust When the pH of the suspension is acidic, heat for 15 minutes to open the pores of the halloysite nanotubes. After flocculent precipitation appears in the suspension, continue to stand for 12 hours, filter with suction, dry, and crush through a 200-mesh sieve to obtain pure Halloysite;

[0023] (2) Mix halloysite and water at a weight ratio of 1:50, fully disperse to form halloysite suspension, and accurately add 1.0% of the quality of the suspension to octadecyltrimethylammonium chloride. Shake at a constant temperature water bath shaker at 65°C at a speed of 150r / min for 3h, so that the exchange rea...

Embodiment 2

[0030] Preparation of Halloysite-loaded Chlorpyrifos Slow-release Pesticide

[0031] Purified halloysite was prepared according to the method described in step (1) of Example 1. Mix halloysite and water at a weight ratio of 1:50, fully disperse halloysite suspension, and accurately add 1.0% cetyltrimethylammonium bromide of the suspension quality, at a temperature of 65 ° C Oscillate on a constant temperature water bath shaker at a speed of 150 r / min for 3 hours, centrifuge, wash, filter with suction, dry, and grind through a 200-mesh sieve to obtain organically modified halloysite. Dissolve chlorpyrifos EC with a mass concentration of 40% in acetone to prepare 50 mL of a solution with a mass concentration of 0.2 g / mL, weigh 0.2 g of organically modified halloysite, add it to the acetone solution, and shake in a constant temperature water bath at 25 °C Shake in the container at a speed of 150r / min for 3h to balance the adsorption of pesticides on halloysite, wash with 50mL di...

Embodiment 3

[0035] Preparation of Dimethoate Sustained Release Pesticide Loaded on Halloysite

[0036] Purified halloysite was prepared according to the method described in step (1) of Example 1. Mix halloysite and water at a weight ratio of 1:50, fully disperse to form halloysite suspension, accurately add 1.0% dioctadecyldimethylammonium bromide of the suspension quality, at a temperature of 65°C Oscillate for 3 hours at a speed of 150 r / min on a constant temperature water bath oscillator, centrifuge, wash, suction filter, dry, and grind through a 200-mesh sieve to obtain organically modified halloysite. Dissolve dimethoate in acetone to prepare 50mL of a solution with a mass concentration of 0.3g / mL, weigh 0.2g of organically modified halloysite, add it to the acetone solution, and place it in a constant temperature water bath shaker at 25°C at 150r Oscillating at a speed of 1 / min for 3 h to balance the adsorption of pesticides on halloysite, washing with 50 mL of distilled water thre...

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Abstract

The invention discloses modified halloysite nanotube composite slow release pesticide and a preparation method thereof, and belongs to the technical field of agricultural slow release pesticide. According to the technical scheme, the method comprises the steps of 1, halloysite purification; 2, organic modification of halloysite; 3, preparation of the halloysite composite slow release pesticide. The prepared modified halloysite nanotube composite slow release pesticide is used in farmland as slow release pesticide, the utilization rate of a herbicide or insecticide or an antibacterial agent or a plant growth regulator is increased, and pollution to the environment and a water source is reduced.

Description

technical field [0001] The invention belongs to the technical field of agricultural slow-release pesticides, in particular to a modified halloysite nanotube composite slow-release pesticide and a preparation method thereof. Background technique [0002] Pesticides are an important means of ensuring food production. Due to unreasonable application methods, extensive farmland management and low utilization rate of pesticides in my country, a large number of active ingredients migrate in the environment (such as leaching, drifting, volatilization, etc.), and enter the surface, groundwater and other areas, becoming an important source of agricultural non-point source pollution. source. The slow and controlled release technology of pesticides can reasonably adjust the release rate of active ingredients according to the requirements of the prevention and control objectives, so as to improve the utilization rate and prolong the effective period. [0003] Adsorption-type slow-relea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/08A01N37/26A01N57/16A01N57/12C09K17/08
CPCA01N25/08A01N37/26A01N57/12A01N57/16C09K17/08A01N2300/00
Inventor 梁蕊王玉停郭永康轩小朋
Owner HENAN NORMAL UNIV
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