CN201260352Y - Microcapsules of the herbicide clomazone - Google Patents

Abstract

The utility model discloses a microcapsule of mathamidophos as a weedicide. The microcapsule comprises a core and a shell coating outside the core. A hole for communicating the core and the exterior of the shell is formed on the wall of the shell; oil soluble mathamidophos liquid drop is taken as the core; and an ureaformaldehyde resin layer or a cyanuramide resin layer is taken as the shell. The utility model is a monodispersed flowing particle, achieves the microencapsulization of liquid pesticide, the height stabilization of products and the slow release of effective components, has the advantages of excursion prevention, ultrahigh efficiency, low toxicity, economy and safety, is an environment-friendly preparation, and can be used for preventing and eliminating broad leaved weeds and gramineous weeds in soybean, cassava, corn, rape, sugarcane and tobacco fields.

Description

Microcapsules of the herbicide clomazone

technical field

The utility model belongs to a pesticide preparation, in particular to a microcapsule of the herbicide clomazone.

Background technique

Clomazone, whose chemical name is 2-(2-chlorophenyl)methyl-4,4-dimethyl-3-isoxazolone, belongs to the class of isoxazolinone herbicides and can control soybean , Cotton, cassava, corn, rape, sugar cane, tobacco and other crops such as barnyardgrass, foxtail, golden foxtail, crabgrass, black nightshade, sage, water spiny needles, blueberry, sorrel leaf Polygonum, willow-leaved Polygonum, green Annual grasses and broad-leaved weeds such as ears, quinoa, small quinoa, duck foot leather, velvetleaf, wild watermelon seedlings, wolfberry, etc. strong inhibitory effect.

Clomazone is a viscous liquid, and the existing formulations of herbicides with clomazone as active ingredients are mainly emulsifiable concentrate preparations, which have the following disadvantages:

1. Contains a large amount of organic solvents, such as toluene, xylene, etc., the discharge of which not only causes waste of resources, but also seriously pollutes the ecological environment;

2. Clomazone has relatively high vapor pressure and is easy to volatilize, resulting in low utilization rate, large amount of pesticides, and high cost;

3. It is easy to drift and harm adjacent sensitive crops. The drift of clomazone mist or steam can cause phytotoxicity to sensitive plants. In order to avoid drift hazards, the conditions for mechanical application on the ground are harsh: low pressure and large water spray volume must be used , Choose to apply pesticides in the morning and evening when the wind is low, and pay attention to wind direction and speed, and avoid sensitive crops such as fruit trees and vegetables; let alone spraying by airplane.

Microcapsules are a new dosage form of pesticides and a new trend in the development of pesticide dosage forms. Microcapsule technology is used to coat pesticide active substances in capsule wall materials to form tiny capsule preparations, which can make liquid pesticides powder and effectively Prevent drift and overcome the above-mentioned defects in the emulsifiable concentrate preparation. Therefore, the development of microcapsules of the herbicide clomazone has become a general trend.

Utility model content

The technical problem to be solved by the utility model is to provide a microcapsule of the herbicide clomazone, which is a core-shell structure, and the oil-soluble viscous liquid clomazone is coated on a flexible, mesh-like structure with certain gaps. In the polymer resin material, and in order to effectively control the drug release, the shell wall is designed with pores. The utility model microencapsulates clomazone into monodisperse fluid particles, which can avoid the use of a large amount of organic solvents, reduce costs, and reduce environmental pollution; powderize liquid pesticides, effectively prevent drifting, and reduce harm to adjacent plants; Reduce the loss and volatilization of pesticides, improve the stability of pesticides, have the characteristics of slow release, super high efficiency, low toxicity, economy and safety, convenient storage and transportation, can be sprayed by aircraft, and expand the way of spraying. It is an environmentally friendly preparation and can be used Control broadleaf and gramineous weeds in soybean, cassava, corn, rapeseed, sugarcane and tobacco fields.

In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is: a microcapsule of the herbicide clomazone, comprising a core and a shell coated outside the core, with pores connecting the core and the outside of the shell on the shell wall , the core is an oil-soluble clomazone droplet, and the shell is one of a urea-formaldehyde resin layer or a melamine resin layer.

The shell can be a urea-formaldehyde resin layer, which is a polymerization reaction product of urea and formaldehyde.

The shell can also be a melamine resin layer, which is a polymerization reaction product of melamine and formaldehyde.

The particle size of the microcapsule is 0.1-10 microns.

The pores are radially distributed with the core as the center.

The above-mentioned microcapsules are spherical; they can also be ellipsoidal.

The utility model adopts the above-mentioned technical scheme, and the herbicide provided is that viscous clomazone droplets are coated in urea-formaldehyde resin or melamine resin high-molecular polymer, and has a monodisperse fluidity with a core-shell structure. Granular microcapsules, compared with the existing emulsifiable concentrate preparations, have achieved technical progress in that they overcome the disadvantages of using a large amount of organic solvents in traditional emulsifiable concentrate preparations, reduce environmental pollution, and reduce the volatilization and loss of clomazone. It realizes the powderization of liquid pesticides, highly stable products, and slow release of active ingredients. It has the characteristics of anti-drift, ultra-high efficiency, low toxicity, economy, and safety, and is convenient for storage and transportation. In addition, it can be sprayed by aircraft to expand the method of application. It is an environmentally friendly preparation and can be widely used in soybean, cassava, corn, rapeseed, sugarcane and tobacco fields to control broad-leaved weeds and grass weeds.

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

Description of drawings

Fig. 1 is the overall structural representation of the utility model embodiment (1);

Fig. 2 is a longitudinal sectional view of Fig. 1;

Fig. 3 is the longitudinal sectional view of the utility model embodiment (two);

Among them: 1. Nuclei - clomazone droplets;

21. Shell - urea-formaldehyde resin layer;

22. Shell - melamine resin layer;

3. Pores.

Detailed ways

Embodiment (1)

Figure 1 and Figure 2 show a microcapsule of the herbicide clomazone, which includes a core 1 and a shell 21 coated outside the core 1. The wall of the shell 21 has pores 3 connecting the core 1 and the outside of the shell 21 , and the pores 3 are radially distributed with the core 1 as the center.

Among them, the core 1 is an oil-soluble clomazone droplet; the shell 21 is a urea-formaldehyde resin layer, which is a polymer reaction product of urea and formaldehyde.

The microcapsule is spherical and has a particle size of 0.1-10 microns.

The above-mentioned microcapsules are prepared through the steps of emulsification of the nuclear material clomazone → polycondensation of the prepolymer of urea and formaldehyde → separation and drying.

Embodiment (2)

FIG. 3 is also a microcapsule of the herbicide clomazone, which includes a core 1 and a shell 22 coated outside the core 1 . There are pores 3 on the wall of the shell 22, connecting the core 1 with the outside of the shell 22; the pores 3 are radially distributed with the core 1 as the center.

Among them, the core 1 is an oil-soluble clomazone droplet; the shell 22 is a melamine resin layer, which is a polymerization reaction product of melamine and formaldehyde.

The microcapsule is an ellipsoid with a particle diameter of 0.1-10 microns.

The microcapsule is prepared through the steps of emulsification of nuclear material clomazone, polycondensation of prepolymer of melamine and formaldehyde, separation and drying.

Of course, the specific implementation of the present utility model is not limited to the above-mentioned two embodiments, and its related features can have various forms of equivalent transformation, such as: its appearance can have the outer contour of other geometric shapes of core-shell structure instead of implementing Spherical and ellipsoid in the examples; the size of the core, the thickness of the shell, the number of pores and the size of the pores can be adjusted according to actual needs. All the microcapsules of the herbicide clomazone realized by the features defined by the claims of the utility model are considered to fall within the protection scope of the utility model.

Claims (7)

1. A microcapsule of the herbicide clomazone, characterized in that: it comprises a core and a shell coated on the outside of the core, and the shell wall has pores connecting the core and the outside of the shell, and the core is oil-soluble clomazone. Spirit droplet, the shell is one of urea-formaldehyde resin layer or melamine resin layer. 2. The microcapsules of the herbicide clomazone according to claim 1, characterized in that: the shell is a urea-formaldehyde resin layer, which is a polymerization reaction product of urea and formaldehyde. 3. The microcapsules of the herbicide clomazone according to claim 1, characterized in that: the shell is a melamine resin layer, which is a polymerization reaction product of melamine and formaldehyde. 4. The microcapsules of the herbicide clomazone according to claim, characterized in that: the particle diameter of the microcapsules is 0.1-10 microns. 5. The microcapsules of the herbicide clomazone according to claim 1, characterized in that: the pores are radially distributed with the nucleus as the center. 6. The microcapsules of the herbicide clomazone according to any one of claims 1-5, characterized in that the microcapsules are spherical. 7. The microcapsules of the herbicide clomazone according to any one of claims 1-5, characterized in that: the microcapsules are ellipsoidal.

Images