CN110810404B

CN110810404B - Water dispersible granule containing glyphosate and preparation method thereof

Info

Publication number: CN110810404B
Application number: CN201911018982.6A
Authority: CN
Inventors: 谭葵; 韦沙迪; 温路欢; 莫俊锐; 王爱臣; 廖联安
Original assignee: Huizhou Yinnong Technology Co ltd
Current assignee: Huizhou Yinnong Technology Co ltd
Priority date: 2019-10-24
Filing date: 2019-10-24
Publication date: 2020-12-22
Anticipated expiration: 2039-10-24
Also published as: CN110810404A

Abstract

The embodiment of the invention discloses a glyphosate-containing water dispersible granule, which comprises 60-80% of glyphosate, 5-20% of a dispersing agent, 1-5% of a wetting agent, 1-5% of a disintegrating aid, 0.05-0.3% of an antifoaming agent and 0-20% of a filler. The glyphosate water dispersible granule prepared by the embodiment of the invention has the advantages of higher suspension rate of active ingredients, quicker disintegration, good heat storage stability and better weed control effect while being convenient to store and transport.

Description

Water dispersible granule containing glyphosate and preparation method thereof

Technical Field

The embodiment of the invention relates to the technical field of pesticide preparation, and particularly relates to a glyphosate-containing water dispersible granule and a preparation method thereof.

Background

Glyphosate, alias noda, chemical name: n- (phosphonomethyl) glycine of formula C₃H₈NO₅P is a non-selective and residue-free biocidal herbicide, is very effective to perennial rooted weeds, and is widely used in rubber, mulberry, tea, orchards and sugarcane fields. Mainly inhibits enol pyruvyl shikimic acid phosphate synthetase in plants, thereby inhibiting the conversion of shikimic acid to phenylalanine, tyrosine and tryptophan, interfering protein synthesis and leading to plant death. Glyphosate is absorbed by stems and leaves and then transferred to various parts of plants, and can prevent and kill monocotyledons, dicotyledons, annual and perennial plants, herbaceous plants, shrubs and other plants of more than 40 families. After entering the soil, the glyphosate is combined with metal ions such as iron, aluminum and the like to lose activity, and has no adverse effect on seeds and soil microorganisms hidden in the soil.

At present, water dispersible granules have the problems of low suspension rate of active ingredients, slow disintegration speed, poor redispersion effect and poor heat storage stability, for example, the suspension rate of the active ingredients is reduced, the active ingredients are decomposed, the active ingredients are degraded in disintegration or are not disintegrated after the preparation is stored in heat, so that nozzles or filter screens are easy to block when the water dispersible granules are used, and the quality and the application effect of the water dispersible granules are directly influenced.

Disclosure of Invention

Therefore, the embodiment of the invention provides a glyphosate-containing water dispersible granule and a preparation method thereof, and aims to solve the problems of low suspension rate of active ingredients, slow disintegration speed, poor redispersion effect, poor heat storage stability and the like of the water dispersible granule in the prior art.

In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:

the glyphosate-containing water dispersible granule is characterized by comprising 60-80% of glyphosate, 5-20% of a dispersing agent, 1-5% of a wetting agent, 1-5% of a disintegrating aid, 0.05-0.3% of an antifoaming agent and 0-20% of a filler.

Preferably, the water dispersible granule comprises 65-75% of glyphosate, 10-15% of a dispersing agent, 2-4% of a wetting agent, 2-4% of a disintegrating aid, 0.1-0.2% of an antifoaming agent and 3-18% of a filler.

Preferably, the dispersant is one or more of polycarboxylate dispersant, lignosulfonate dispersant, alkyl naphthalene sulfonate formaldehyde condensate and sodium methylene dinaphthalene sulfonate;

wherein the polycarboxylate dispersant is Atlox Metaperse 550S, CP86, YUS-WG7 or Agrilian 788;

the lignosulfonate dispersant is Reax 83A, Reax 88A, Borreperse NA or Borreperse 3A;

the naphthalenesulfonate dispersant is Tamol NN8906, Tamol DN and AUX-L.

Preferably, the wetting agent is selected from one or more of sulfate wetting agents, alkyl naphthalene sulfonate anion wetting agents and sodium dodecyl sulfate;

the sulfate wetting agent is Reax WL, YUS-SXC, the sulfonate wetting agent is TERGITOL W-610, and the alkyl naphthalene sulfonate anion wetting agent is Morwet EFW.

Preferably, the disintegration aid is selected from one or more of glucose, urea and ammonium sulphate.

Preferably, the filler is selected from one or more of calcined kaolin, light calcium carbonate, corn starch, diatomaceous earth, white carbon and inert clay.

The embodiment of the invention also provides a method for preparing the glyphosate-containing water dispersible granule, which is characterized in that,

dissolving the dispersing agent, the wetting agent and the disintegrating aid in water according to a ratio to form a mixed solution;

adding the glyphosate and the filler into the mixed solution for homogenizing and dispersing to obtain a homogeneous dispersion liquid;

and (3) crushing the materials in the homogeneous dispersion liquid to a particle size D98 of less than or equal to 5 microns, and then spray-drying the mixed solution to obtain the glyphosate-containing water dispersible granule.

Preferably, the temperature of the spray drying is 170 ℃.

Preferably, in the homogenizing and dispersing process, a homogenizer is adopted for homogenizing and dispersing for 30min, and the rotating speed of the homogenizer is 1470 r/min.

Preferably, the defoaming agent is added in the forming process, the homogeneous dispersion process and the material crushing process of the mixed solution.

The embodiment of the invention has the following advantages:

the glyphosate water dispersible granule prepared by the embodiment of the invention has the advantages of higher suspension rate of active ingredients, quicker disintegration, good heat storage stability and better weed control effect while being convenient to store and transport.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples 1 to 5

Table 1 shows the glyphosate-containing water dispersible granules of examples 1 to 5 of the present invention, and the glyphosate-containing water dispersible granules of comparative examples 1 to 2 of the prior art.

TABLE 1

Example 6

The preparation method of the glyphosate-containing water dispersible granule of the embodiment 1, the embodiment 2, the embodiment 3, the embodiment 4 or the embodiment 5 comprises the following steps

1. According to the percentage proportion of the embodiment, the dispersing agent, the wetting agent and the disintegrating aid are added into water to be dissolved to form a mixed solution;

2. adding the glyphosate and the filler into the mixed solution, and homogenizing and dispersing for 30min by using a homogenizer at the rotating speed of 1470 r/min;

3. grinding the uniformly dispersed materials by using a colloid mill until the particle size D98 of the materials is less than or equal to 5 microns; in the step, materials in the mixed solution are ground by a wet method and then spray-dried, so that the water addition amount is strictly controlled during slurry preparation, too much water addition amount can cause overhigh water content of the glyphosate-containing water dispersible granules during spray drying, energy consumption is increased, too little water addition amount can cause too high viscosity of the slurry and poor flowability so as to influence the spray efficiency;

4. spray drying the ground slurry at 170 ℃ by using a pressure type spray dryer to obtain particles, namely glyphosate water dispersible granules, wherein the moisture content of the particles is less than or equal to 3%; in the step, the drying temperature is controlled at 170 ℃, the temperature is too low, the water content in the glyphosate-containing water dispersible granule is too high, the stability is poor, and the index of a sample with too high temperature is poor.

In the embodiment of the invention, certain defoaming agents are respectively added in the steps 1, 2 and 3 for defoaming.

Comparative example 1

The comparative example differs from example 3 according to the invention in that the dispersant used is different and the preparation process corresponds to example 2.

Comparative example 2

The comparative example differs from example 3 of the present invention in that the dispersant and wetting agent are different and the preparation method is identical to example 2.

Table 2 shows the performance indexes of the glyphosate-containing water dispersible granule in the embodiment of the invention and the comparative proportion

TABLE 2

As can be seen from Table 2, the glyphosate-containing water dispersible granules prepared in the examples 1-5 of the invention have the optimal values in various properties.

Test example 1

As shown in Table 3, the influence of different spraying temperatures on the sample indexes of the glyphosate-containing water dispersible granule of example 3 of the invention

TABLE 3

As shown in Table 3, the spray temperature was 170 ℃ and the indices were close to or reached the optimum values.

Test example 2

1. Control of grassy weeds in a subject

2. Experimental medicament

Table 4 shows the amounts of the agents

TABLE 4

3. Method of administering a drug

The weeds are in the bloom stage, the application is carried out for 1 time, and the spray treatment of the stem leaves is carried out. The dosage of the effective component of the glyphosate water dispersible granule in the embodiment of the invention is 1050g/hm²。

4. Investigation

The evaluation value was investigated 7 days after the administration. Absolute number survey method is adopted 14 days and 21 days after drug administration, 3 points are randomly surveyed in each test cell, and each point is 1m²The number of surviving weed plants in each treatment area was investigated, and the fresh weight control effect was investigated at the same time as the number of the weed plants in 21 days after the application of the herbicide.

Drug effect calculation method

The control effect (%) is (1-PT/CK) × 100, wherein PT is the number (or fresh weight) of the residual live grass in the medicament treatment area; CK-number of live grass plants (or fresh weight) in blank control zone.

6. Results of the experiment

Table 5 shows that the glyphosate-containing water dispersible granule of the embodiment of the invention has the effect of controlling weeds 7 days after the application of the glyphosate-containing water dispersible granule

TABLE 5

Table 6 shows that the glyphosate-containing water dispersible granules have the effect of controlling weeds 14 days later

TABLE 6

Table 7 shows that the glyphosate-containing water dispersible granules have the control effect on weeds 21 days after the application of the glyphosate-containing water dispersible granules

TABLE 7

Table 8 shows that the glyphosate-containing water dispersible granule has the fresh weight control effect on the weeds 21 days after the application of the glyphosate

TABLE 8

As shown in tables 5 to 8, the effect of the glyphosate-containing water dispersible granule prepared in the embodiment of the invention on weed control is obviously higher than that of the comparative example and the existing product.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. The glyphosate-containing water dispersible granule is characterized by being prepared from the following raw materials in mass number: 65 kg of glyphosate, 865 kg of dispersing agent CP, 6 kg of dispersing agent Reax 83A, 2 kg of wetting agent Reax WL, 4 kg of disintegration aid glucose, 15010.1 kg of defoaming agent, 18 kg of filler calcined kaolin and 150 kg of deionized water.

2. The glyphosate-containing water dispersible granule is characterized by being prepared from the following raw materials in mass number: 68 kg of glyphosate, 5 kg of Tamol NN 89065 kg of dispersant Reax 88A, 8 kg of wetting agent TERGITOL W-6103 kg, 2 kg of disintegration aid glucose, 1kg of disintegration aid ammonium sulfate, 15010.1 kg of antifoaming agent, 13 kg of filler light calcium carbonate and 150 kg of deionized water.

3. The glyphosate-containing water dispersible granule is characterized by being prepared from the following raw materials in mass number: 70 kg of glyphosate, 10 kg of Atlox Metaperse 550S, 4 kg of Borreperse 3A, 3 kg of wetting agent YUS-SXC, 3 kg of disintegrating aid ammonium sulfate, 15010.1 kg of defoaming agent, 5 kg of filler white carbon black, 5 kg of filler light calcium carbonate and 150 kg of deionized water.

4. The glyphosate-containing water dispersible granule is characterized by being prepared from the following raw materials in mass number: 72 kg of glyphosate, 77 kg of dispersant YUS-WG, 7 kg of dispersant Borresperse NA, 4 kg of wetting agent YUS-SXC, 2 kg of disintegrating aid urea, 15010.1 kg of defoaming agent, 8 kg of filler inert clay and 150 kg of deionized water.

5. The glyphosate-containing water dispersible granule is characterized by being prepared from the following raw materials in mass number: 75 kg of glyphosate, 7889 kg of dispersant Agrilian, 6 kg of dispersant AUX-L, 4 kg of wetting agent Morwet EFW, 1kg of disintegration assistant urea, 1kg of disintegration assistant ammonium sulfate, 15010.1 kg of defoaming agent, 2 kg of filler white carbon black, 2 kg of filler inert clay and 150 kg of deionized water.

6. A method for preparing the glyphosate-containing water dispersible granule of any one of claims 1 to 5, which is characterized by comprising:

and (3) crushing the materials in the homogeneous dispersion liquid to a particle size D98 of less than or equal to 5 microns, and then spray-drying the mixed solution at the temperature of 170 ℃ until the moisture content of the particles is less than or equal to 3% to obtain the glyphosate-containing water dispersible granule.