Attapulgite composite carrier for pesticide slow release and preparation method thereof

Abstract

The invention belongs to the technical field of pesticide slow release carriers, and provides an attapulgite composite carrier for pesticide slow release and a preparation method thereof. The fertilizer is prepared from the following raw materials in parts by weight: 30-70 parts of modified attapulgite, 5-15 parts of a pesticide solution, 5-10 parts of cellulose, 1-5 parts of a solubilizer, 1-5 parts of a drying agent, 1-5 parts of a binder, 3-12 parts of caustic alkali, 3-12 parts of monochloroacetic acid, 1-5 parts of controlled-release granules, 1-3 parts of a dispersing agent and 10-20 parts of deionized water. The preparation method of the modified attapulgite comprises the following steps: 1, grinding and crushing attapulgite raw ore which is naturally weathered for 100-120 days; and 2, adding 80-95 parts of ground and crushed attapulgite into deionized water for dissolving, then adding 1-8 parts of an organic activator, 0.1-0.5 part of an activation dispersant, 1-5 parts of super absorbent sodium polyacrylate and 1-3 parts of cellulose, soaking, filtering, and drying to obtain the modified attapulgite. Compared with the prior art, the attapulgite composite carrier disclosed by the invention has the advantages that the frequency of frequent pesticide application can be reduced, the total dosage is also reduced, and the lasting period of pesticide is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticide slow-release carriers, and in particular relates to an attapulgite composite carrier for pesticide slow-release and a preparation method thereof. Background Art

[0002] Slow-release pesticides refer to pesticides with slow-release properties that are made by combining natural, biodegradable polymer compounds as slow-release materials with some systemic insecticides, fungicides or growth regulators. According to the release characteristics of the active ingredients of pesticides, slow-release pesticide formulations can be divided into two categories: conventional free-release and controlled-release.

[0003] In the related prior art, for example, there is a Chinese patent on a composite biochar-based carrier with pesticide slow-release performance, a preparation method and an application thereof, the publication number of which is CN107183019A. The specific disclosed scheme content is "it is composed of modified biochar, pesticide solution, sodium carboxymethyl cellulose and bentonite, and the steps are: A. rape straw is washed and dried, ground, sieved and set aside; C. Under oxygen-limited conditions, rape straw is pyrolyzed at a certain temperature to obtain biochar, which is washed with deionized water to a constant pH after being treated with sodium hydroxide, and ground into modified biochar after being dried in an oven; D. The modified The modified biochar and the pesticide solution are mixed to prepare a suspension loaded with pesticides, stirred at room temperature, and sodium carboxymethyl cellulose and bentonite are mixed evenly according to weight parts and aged for a period of time. The solid matter is dried at low temperature in a blast oven to obtain a composite carrier. "; Although the composite biochar-based carrier prepared in the above manner has the technical effect that the composite slow-release matrix will not have side effects on the soil and has good environmental compatibility, it is made of modified biochar and other materials, and its adsorption of pesticides is poor, which will lead to a small amount of adsorption of pesticides and a short release time. In the slow release, there is a technical problem that frequent and multiple applications are required due to the small release amount. Summary of the invention

[0004] In view of the above problems existing in the prior art, the object of the present invention is to provide a composite attapulgite carrier for sustained release of pesticides and a preparation method thereof. The attapulgite composite carrier has the advantage of sustained release of pesticides over a long period of time.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A composite attapulgite carrier for pesticide sustained release, comprising the following raw materials by weight: 30-70 parts of modified attapulgite, 5-15 parts of pesticide solution, 5-10 parts of cellulose, 1-5 parts of solubilizer, 1-5 parts of desiccant, 1-5 parts of binder, 3-12 parts of caustic soda, 3-12 parts of monochloroacetic acid, 1-5 parts of controlled release granules, 1-3 parts of dispersant, and 10-20 parts of deionized water; wherein the preparation method of the modified attapulgite comprises the following steps: the first step, grinding and crushing the attapulgite ore after natural weathering for 100-120 days;

[0007] The second step is to take 80-95 parts of ground attapulgite and add it into deionized water to dissolve it, then add 1-8 parts of organic activator, 0.1-0.5 parts of activating dispersant, 1-5 parts of highly absorbent sodium polyacrylate and 1-3 parts of cellulose, and obtain modified attapulgite through soaking, filtering, drying and baking.

[0008] As a preferred technical solution of the present invention, 31 parts of modified attapulgite, 12 parts of pesticide solution, 8 parts of cellulose, 4 parts of solubilizer, 4 parts of desiccant, 4.5 parts of binder, 10.5 parts of caustic soda, 10 parts of monochloroacetic acid, 3 parts of controlled release granules, 3 parts of dispersant, and 10 parts of deionized water.

[0009] As a preferred technical solution of the present invention, the desiccant includes at least one of a calcium chloride desiccant, a montmorillonite desiccant, or a molecular sieve desiccant.

[0010] As a preferred technical solution of the present invention, the adhesive comprises a heat-resistant two-component water-based adhesive.

[0011] As a preferred technical solution of the present invention, the dispersant is lignin sulfonate or LBD-1 carboxylate or phenethylphenol polyoxyethylene sodium sulfate or alkyl alcohol amides.

[0012] As a preferred technical solution of the present invention, the alkyl alcohol amides include one of polyoxyethylene alkanolamide or coconut fatty acid diethanolamide.

[0013] The present invention also provides a method for preparing the composite carrier of attapulgite for sustained release of pesticides as described above, the preparation method comprising the following steps:

[0014] S1, the modified attapulgite and cellulose, solubilizer, caustic soda, monochloroacetic acid, and controlled-release granules are mixed in proportion, then added to an equal amount of deionized water, stirred evenly with a stirrer, and then a desiccant is added for gelation treatment to obtain a gel-like mixture;

[0015] S2, dissolving 5 parts by weight of the pesticide solution in 95-120 parts of the dispersant to obtain a pesticide dispersion with a concentration of 12-15 mg / mL; placing 5 parts by weight of the gel mixture in step S1 into the pesticide dispersion with a concentration of 12-15 mg / mL, shaking and stirring at 50-65° C. for 0.5-1.5 h, then filtering and spraying to coat the pesticide inside the gel mixture, and then drying at a heating temperature of 20-40° C. to obtain a composite drug-loaded modified concave soil;

[0016] S3. Take 70-90 parts of the composite drug-carrying modified attapulgite, 1-10 parts of deionized water and 1-5 parts of a binder, stir and mix them evenly, and dry and granulate them at a heating temperature of 30-45° C. to obtain an attapulgite composite carrier for sustained release of pesticides.

[0017] As a preferred technical solution of the present invention, in step S2, the stirring temperature is 60°C, the oscillation stirring time is 1 hour; and the drying temperature is 30°C.

[0018] The invention relates to a composite attapulgite carrier for sustained release of pesticides and a preparation method thereof, which has the following beneficial effects: the composite attapulgite carrier for sustained release of pesticides contains a modified attapulgite component, which has high adsorption after modification, and on this basis, cellulose is added to improve its adsorption capacity, and the pesticide is adsorbed inside the attapulgite carrier after being combined with a pesticide solution, and the addition of a controlled release granule can further improve the sustained release of the pesticide in the composite attapulgite carrier for sustained release of pesticides over a long period of time, thereby reducing the number of frequent pesticide applications, reducing the total amount of pesticides used, and extending the effective period of the pesticides; at the same time, the prepared composite attapulgite carrier can reduce the large-scale release of drugs in a short period of time, thereby avoiding the acute toxic effects of drugs on the environment and human body, which helps to reduce the toxic and side effects of drugs, reduces the residues of pesticides in plant tissues, improves the safety of agricultural products, and improves the safety of drug use; in addition, the composite attapulgite carrier can effectively reduce the negative impact on water bodies and soil and reduce environmental pollution because it reduces the amount of pesticides used and the number of pesticide applications.

[0019] The present invention will be further described below in conjunction with specific implementation modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 To prepare the modified attapulgite composite carrier of the present invention (the modified attapulgite is in the form of white powder);

[0021] Figure 2 This is a composite carrier diagram of concave soil for sustained release of pesticides applied for by the present invention;

[0022] Figure 3 The experimental test diagrams are of Examples 1-4, Comparative Examples 1-3 and Test Examples of concave clay composite carriers obtained by the preparation method of the present invention. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0025] Preliminary preparation

[0026] The composite carrier of attapulgite for pesticide sustained release in the present invention is composed of the following raw materials by weight: 30 parts of modified attapulgite, 10 parts of pesticide solution, 5 parts of cellulose, 1 part of solubilizer, 1 part of desiccant, 1 part of binder, 4 parts of caustic soda, 4 parts of monochloroacetic acid, 1-5 parts of controlled release granules, 1-3 parts of dispersant, and 15 parts of deionized water; wherein the preparation method of the modified attapulgite comprises the following steps: the first step, grinding and crushing the attapulgite ore after natural weathering for 100-120 days;

[0027] The second step is to take 80-95 parts of ground attapulgite and add it into deionized water to dissolve it, then add 1-8 parts of organic activator, 0.1-0.5 parts of activating dispersant, 1-5 parts of highly absorbent sodium polyacrylate and 1-3 parts of cellulose, and obtain modified attapulgite through soaking, filtering, drying and baking.

[0028] It should be noted that: Figure 1 This is a picture of modified concave soil used to obtain the concave soil composite carrier of the present invention; Figure 2 The invention relates to obtaining a granular concave soil composite carrier.

[0029] Example 1

[0030] A composite carrier of attapulgite for sustained release of pesticides, comprising the following raw materials by weight: 55 parts of modified attapulgite, 15 parts of pesticide solution, 5 parts of cellulose, 1 part of solubilizer, 1 part of desiccant, 1 part of binder, 3 parts of caustic soda, 3 parts of monochloroacetic acid, 5 parts of controlled release granules, 1 part of dispersant, and 10 parts of deionized water; wherein the preparation method of the modified attapulgite comprises the following steps: the first step, grinding and crushing the attapulgite ore after 100 days of natural weathering;

[0031] The second step is to take 95 parts of ground attapulgite and add it into deionized water to dissolve it, then add 1-8 parts of organic activator, 0.2 parts of activating dispersant, 1 part of highly absorbent sodium polyacrylate and 2 parts of cellulose, and obtain modified attapulgite through soaking, filtering and drying.

[0032] In order to obtain a composite carrier of attapulgite for sustained release of pesticides, the preparation method comprises the following steps: S1, the modified attapulgite and cellulose, a solubilizer, caustic soda, monochloroacetic acid, and a controlled-release granule are mixed in the above proportions, then added to an equal amount of deionized water, stirred evenly with a stirrer, and then a desiccant is added for gelation treatment to obtain a gel-like mixture;

[0033] S2, dissolving 5 parts by weight of the pesticide solution in 95-120 parts of the dispersant to obtain a pesticide dispersion with a concentration of 12-15 mg / mL; placing 5 parts by weight of the gel mixture in step S1 into the pesticide dispersion with a concentration of 12-15 mg / mL, shaking and stirring at 50°C for 1 hour, then filtering and spraying to coat the pesticide inside the gel mixture, and then drying at a heating temperature of 20°C to obtain a composite drug-loaded modified concave soil;

[0034] S3. Take 90 parts of composite drug-carrying modified attapulgite, 9 parts of deionized water and 1 part of a binder, stir and mix them evenly, and then dry and granulate them at a heating temperature of 30° C. to obtain an attapulgite composite carrier for sustained release of pesticides.

[0035] The desiccant in the above preparation method is a calcium chloride desiccant; the binder is a heat-resistant two-component aqueous binder; and the dispersant is lignin sulfonate.

[0036] Example 2

[0037] A composite carrier of attapulgite for sustained release of pesticides, comprising the following raw materials by weight: 65 parts of modified attapulgite, 10 parts of pesticide solution, 6 parts of cellulose, 3 parts of solubilizer, 2.5 parts of desiccant, 2.5 parts of binder, 3.5 parts of caustic soda, 4.5 parts of monochloroacetic acid, 1 part of controlled release granules, 1 part of dispersant, and 10 parts of deionized water; wherein the preparation method of the modified attapulgite comprises the following steps: the first step, grinding and crushing the attapulgite ore after natural weathering for 110 days;

[0038] The second step is to take 89 parts of ground attapulgite and add them into deionized water to dissolve, then add 7.7 parts of organic activator, 0.3 parts of activating dispersant, 2 parts of highly absorbent sodium polyacrylate and 1 part of cellulose, and obtain modified attapulgite through soaking, filtering and drying.

[0039] In order to obtain a composite carrier of attapulgite for sustained release of pesticides, the preparation method comprises the following steps: S1, the modified attapulgite and cellulose, a solubilizer, caustic soda, monochloroacetic acid, and a controlled-release granule are mixed in the above proportions, then added to an equal amount of deionized water, stirred evenly with a stirrer, and then a desiccant is added for gelation treatment to obtain a gel-like mixture;

[0040] S2, dissolving 5 parts by weight of the pesticide solution in 95-120 parts of the dispersant to obtain a pesticide dispersion with a concentration of 12-15 mg / mL; placing 5 parts by weight of the gel mixture in step S1 into the 12-15 mg / mL concentration pesticide dispersion, shaking and stirring at 55° C. for 0.8 h, then filtering and spraying to coat the pesticide inside the gel mixture, and then drying at a heating temperature of 20° C. to obtain a composite drug-loaded modified concave soil;

[0041] S3. Take 88 parts of composite drug-carrying modified attapulgite, 9.8 parts of deionized water and 2.2 parts of a binder, stir and mix them evenly, and then dry and granulate them at a heating temperature of 32° C. to obtain an attapulgite composite carrier for sustained release of pesticides.

[0042] The desiccant in the preparation method comprises montmorillonite desiccant; the binder is a heat-resistant two-component aqueous binder; and the dispersant is LBD-1 carboxylate.

[0043] Example 3

[0044] A composite carrier of attapulgite for sustained release of pesticides, comprising the following raw materials by weight: 31 parts of modified attapulgite, 12 parts of pesticide solution, 8 parts of cellulose, 4 parts of solubilizer, 4 parts of desiccant, 4.5 parts of binder, 10.5 parts of caustic soda, 10 parts of monochloroacetic acid, 3 parts of controlled release granules, 3 parts of dispersant, and 10 parts of deionized water; wherein the preparation method of the modified attapulgite comprises the following steps: the first step, grinding and crushing the attapulgite ore after 105 days of natural weathering;

[0045] The second step is to take 86 parts of ground attapulgite and add them into deionized water to dissolve, then add 7.7 parts of organic activator, 0.3 parts of activating dispersant, 4 parts of highly absorbent sodium polyacrylate and 2 parts of cellulose, and obtain modified attapulgite through soaking, filtering and drying.

[0046] In order to obtain a composite carrier of attapulgite for sustained release of pesticides, the preparation method comprises the following steps: S1, the modified attapulgite and cellulose, a solubilizer, caustic soda, monochloroacetic acid, and a controlled-release granule are mixed in the above proportions, then added to an equal amount of deionized water, stirred evenly with a stirrer, and then a desiccant is added for gelation treatment to obtain a gel-like mixture;

[0047] S2, dissolving 5 parts by weight of the pesticide solution in 95-120 parts of the dispersant to obtain a pesticide dispersion with a concentration of 12-15 mg / mL; placing 5 parts by weight of the gel mixture in step S1 into the pesticide dispersion with a concentration of 12-15 mg / mL, shaking and stirring at 60° C. for 1 hour, then filtering and spraying to coat the pesticide inside the gel mixture, and then drying at a heating temperature of 30° C. to obtain a composite drug-loaded modified concave soil;

[0048] S3. Take 87 parts of composite drug-carrying modified attapulgite, 8.5 parts of deionized water and 4.5 parts of a binder, stir and mix them evenly, and then dry and granulate them at a heating temperature of 40° C. to obtain an attapulgite composite carrier for sustained release of pesticides.

[0049] The desiccant in the preparation method is a molecular sieve desiccant; the binder is a heat-resistant two-component water-based binder; the dispersant is an alkyl alcohol amide; and the alkyl alcohol amide is a polyoxyethylene alkyl alcohol amide.

[0050] Example 4

[0051] A composite attapulgite carrier for pesticide slow release, comprising the following raw materials by weight: 30-70 parts of modified attapulgite, 5-15 parts of pesticide solution, 5 parts of cellulose, 2 parts of solubilizer, 1 part of desiccant, 1 part of binder, 3 parts of caustic soda, 3 parts of monochloroacetic acid, 5 parts of controlled release granules, 1 part of dispersant, and 20 parts of deionized water; wherein the preparation method of the modified attapulgite comprises the following steps: the first step, grinding and crushing the attapulgite ore after 120 days of natural weathering;

[0052] The second step is to take 80-95 parts of ground attapulgite and add it into deionized water to dissolve it, then add 1-8 parts of organic activator, 0.1-0.5 parts of activating dispersant, 1-5 parts of highly absorbent sodium polyacrylate and 1-3 parts of cellulose, and obtain modified attapulgite through soaking, filtering, drying and baking.

[0053] In order to obtain a composite carrier of attapulgite for sustained release of pesticides, the preparation method comprises the following steps: S1, the modified attapulgite and cellulose, a solubilizer, caustic soda, monochloroacetic acid, and a controlled-release granule are mixed in the above proportions, then added to an equal amount of deionized water, stirred evenly with a stirrer, and then a desiccant is added for gelation treatment to obtain a gel-like mixture;

[0054] S2, dissolving 5 parts by weight of the pesticide solution in 95-120 parts of the dispersant to obtain a pesticide dispersion with a concentration of 12-15 mg / mL; placing 5 parts by weight of the gel mixture in step S1 into the pesticide dispersion with a concentration of 12-15 mg / mL, shaking and stirring at 50-65° C. for 0.5-1.5 h, then filtering and spraying to coat the pesticide inside the gel mixture, and then drying at a heating temperature of 20-40° C. to obtain a composite drug-loaded modified concave soil;

[0055] S3. Take 70-90 parts of the composite drug-carrying modified attapulgite, 1-10 parts of deionized water and a binder, stir and mix them evenly, and then dry and granulate them at a heating temperature of 30-45° C. to obtain an attapulgite composite carrier for sustained release of pesticides.

[0056] The desiccant in the preparation method is a molecular sieve desiccant; the binder is a heat-resistant two-component aqueous binder; the dispersant is an alkyl alcohol amide; and the alkyl alcohol amide is coconut fatty acid diethanolamide.

[0057] Comparative Example 1

[0058] No modified attapulgite was added during the preparation, and other additives and preparation conditions were kept the same as those in Example 1.

[0059] Comparative Example 2

[0060] No cellulose was added during the preparation, and other additives and preparation conditions were kept the same as those in Example 1.

[0061] Comparative Example 3

[0062] No controlled-release granules were added during the preparation, and other additives and preparation conditions were the same as those in Example 1.

[0063] Test example

[0064] During the preparation, the modified attapulgite, cellulose and controlled-release granules were not added, and other additives and preparation conditions were the same as those in Example 1.

[0065] The attapulgite composite carriers for sustained release of pesticides obtained in the above Examples 1-4, Comparative Examples 1-3 and Test Examples were prepared into 8 equal portions of 5 g for release experiments.

[0066] The specific experiment is as follows: 5g of the attapulgite composite carrier is placed in a dialysis bag with a molecular weight of 4000-6000, and then both ends of the dialysis bag are sealed; then 100mL of anhydrous ethanol is measured and placed in a 300mL containing bottle as a sustained-release medium; the dialysis bag containing the attapulgite composite carrier is placed in the containing bottle, and the ethanol completely permeates the dialysis bag; the containing bottle is sealed and placed in a 25°C environment, 1mL of the sustained-release solution is taken at regular intervals (10 days), diluted to 15mL with ethanol, and then the absorbance value is measured at 302nm with an ultraviolet spectrophotometer; 1mL of the sustained-release solution taken during this period is supplemented with 1mL of ethanol; the content of pesticide in the sustained-release solution is calculated by the standard curve, and the cumulative release results of pesticides tested in Examples 1-4, Comparative Examples 1-3 and Test Examples are shown in Figure 3 .

[0067] from Figure 3 It can be seen from the table in that the horizontal coordinate represents time (days), the vertical coordinate represents the cumulative release of pesticides, and the curve in the figure represents the trend of the cumulative release of pesticides. The cumulative release of pesticides of the concave soil composite carriers obtained by the present invention, namely, Examples 1-4, are all distributed above Comparative Examples 1-3 and the test examples, indicating that the cumulative release of pesticides is gradually and slowly released with the passage of time; that is, compared with Comparative Example 1: the concave soil composite carrier contains modified concave soil components, which have high adsorption after modification; compared with Comparative Example 2: Example 1 adds cellulose on this basis to enhance its adsorption capacity, and after combining with the pesticide solution, the pesticide is adsorbed inside it; compared with Comparative Example 3: the addition of controlled-release particles The agent can further enhance the sustained release of pesticides in the kaolin composite carrier used for sustained release of pesticides over a longer period of time, thereby reducing the number of frequent applications, reducing the total amount of medicine used, and extending the effective period of the pesticide; compared with comparative examples 1-3 and the test example: the prepared kaolin composite carrier can reduce the large-scale release of drugs in a short period of time, thereby avoiding the acute toxic effects of drugs on the environment and human body, which helps to reduce the toxic and side effects of drugs, reduces the residues of pesticides in plant tissues, improves the safety of agricultural products, and improves the safety of drug use; in addition, the kaolin composite carrier can effectively reduce the negative impact on water bodies and soil and reduce environmental pollution because it reduces the amount of pesticide used and the number of applications.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0069] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A composite carrier of attapulgite for sustained release of pesticides, characterized in that: The invention is composed of the following raw materials by weight: 30-70 parts of modified attapulgite, 5-15 parts of pesticide solution, 5-10 parts of cellulose, 1-5 parts of solubilizer, 1-5 parts of desiccant, 1-5 parts of binder, 3-12 parts of caustic soda, 3-12 parts of monochloroacetic acid, 1-5 parts of controlled-release granules, 1-3 parts of dispersant, and 10-20 parts of deionized water; wherein the preparation method of the modified attapulgite comprises the following steps: the first step is to grind and crush the attapulgite ore after natural weathering for 100-120 days; The second step is to take 80-95 parts of ground attapulgite and add it into deionized water to dissolve it, then add 1-8 parts of organic activator, 0.1-0.5 parts of activating dispersant, 1-5 parts of highly absorbent sodium polyacrylate and 1-3 parts of cellulose, and obtain modified attapulgite through soaking, filtering, drying and baking.

2. The attapulgite composite carrier for sustained release of pesticides according to claim 1, characterized in that: 31 parts of modified attapulgite, 12 parts of pesticide solution, 8 parts of cellulose, 4 parts of solubilizer, 4 parts of desiccant, 4.5 parts of binder, 10.5 parts of caustic soda, 10 parts of monochloroacetic acid, 3 parts of controlled release granules, 3 parts of dispersant, and 10 parts of deionized water.

3. The attapulgite composite carrier for sustained release of pesticides according to claim 1, characterized in that: The desiccant includes at least one of a calcium chloride desiccant, a montmorillonite desiccant, or a molecular sieve desiccant.

4. The attapulgite composite carrier for sustained release of pesticides according to claim 1, characterized in that: The adhesive comprises a heat-resistant two-component aqueous adhesive.

5. A composite attapulgite carrier for sustained release of pesticides according to any one of claims 1 to 4, characterized in that: The dispersant is lignin sulfonate or LBD-1 carboxylate or phenethylphenol polyoxyethylene sodium sulfate or alkyl alcohol amide.

6. The attapulgite composite carrier for sustained release of pesticides according to claim 5, characterized in that: The alkyl alcohol amides include one of polyoxyethylene alkanolamide or coconut fatty acid diethanolamide.

7. A method for preparing a composite carrier of attapulgite for sustained release of pesticides as claimed in any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps S1, the modified attapulgite and cellulose, solubilizer, caustic soda, monochloroacetic acid, and controlled-release granules are mixed in proportion, then added to an equal amount of deionized water, stirred evenly with a stirrer, and then a desiccant is added for gelation treatment to obtain a gel-like mixture; S2, dissolving 5 parts by weight of the pesticide solution in 95-120 parts of the dispersant to obtain a pesticide dispersion with a concentration of 12-15 mg / mL; placing 5 parts by weight of the gel mixture in step S1 into the pesticide dispersion with a concentration of 12-15 mg / mL, shaking and stirring at 50-65° C. for 0.5-1.5 h, then filtering and spraying to coat the pesticide inside the gel mixture, and then drying at a heating temperature of 20-40° C. to obtain a composite drug-loaded modified concave soil; S3. Take 70-90 parts of the composite drug-carrying modified attapulgite, 1-10 parts of deionized water and 1-5 parts of a binder, stir and mix them evenly, and dry and granulate them at a heating temperature of 30-45° C. to obtain an attapulgite composite carrier for sustained release of pesticides.

8. The preparation method according to claim 7, characterized in that: In step S2, the stirring temperature is 60°C, the oscillation stirring time is 1 hour; and the drying temperature is 30°C.

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