CN-122010620-A - Multilayer coated pesticide fertilizer and preparation method thereof

CN122010620ACN 122010620 ACN122010620 ACN 122010620ACN-122010620-A

Abstract

The invention belongs to the technical field of agricultural chemicals, and particularly relates to a multilayer coated pesticide fertilizer and a preparation method thereof, wherein the multilayer coated pesticide fertilizer sequentially comprises a core layer, a first coated layer, a first functional layer, a second coated layer, a second functional layer, a third coated layer and a shell layer from inside to outside, the core layer comprises a potash fertilizer and a first pesticide, the first functional layer comprises a balanced fertilizer and a bactericide, the second functional layer comprises a nitrogenous fertilizer and a second pesticide, the shell layer comprises a biological hormone, the degradation rate of the third coated layer is larger than the degradation rate of the second coated layer, the degradation rate of the second coated layer is larger than the degradation rate of the first coated layer, and the multilayer coated pesticide fertilizer realizes that the release of the fertilizers and pesticides is matched with three key growth periods of crops through a layer-by-layer degradation mechanism, can cover the growth period of the crops through one-time application, and reduces the input and loss of the fertilizers and the pesticides.

Inventors

ZHOU YAN
TAN SHIYONG
WEN YAXIONG
WU XIANG

Assignees

湖南神隆科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260206

Claims (10)

1. The multilayer coated pesticide fertilizer is characterized by sequentially comprising a core layer, a first coating layer, a first functional layer, a second coating layer, a second functional layer, a third coating layer and a shell layer from inside to outside, wherein the first coating layer is coated outside the core layer, the first functional layer is arranged outside the first coating layer, the second coating layer is coated outside the first functional layer, the second functional layer is arranged outside the second coating layer, the third coating layer is coated outside the second functional layer, and the shell layer is coated outside the third coating layer; The core layer comprises a potash fertilizer and a first pesticide, the first functional layer comprises a balance fertilizer and a bactericide, the second functional layer comprises a nitrogen fertilizer and a second pesticide, and the outer shell layer comprises a biological hormone; the degradation rate of the third coating layer is greater than that of the second coating layer, and the degradation rate of the second coating layer is greater than that of the first coating layer.
2. The multilayer coated pesticide fertilizer according to claim 1, wherein the mass ratio of the core layer to the first functional layer to the second functional layer is (0.5-1.5): 0.5-1.5.
3. The multilayer coated pesticide fertilizer according to claim 1, wherein the mass fraction of the potash fertilizer in the core layer is 97-99.5 wt%, the mass fraction of the first pesticide is 0.4-2.9 wt%, and the balance is an adhesive; In the first functional layer, the mass fraction of the balance fertilizer is 98-99.8 wt%, the mass fraction of the bactericide is 0.1-1.9 wt%, and the balance is adhesive; in the second functional layer, the mass fraction of the nitrogen fertilizer is 98.5-99.8 wt%, the mass fraction of the second pesticide is 0.4-1.9 wt%, and the balance is adhesive.
4. The multilayer coated pesticide fertilizer according to claim 1, wherein the nutrient content of the potash fertilizer in the core layer is 45% or more, the nutrient content of the balance fertilizer in the first functional layer is 40% or more, and the nutrient content of the nitrogen fertilizer in the second functional layer is 35% or more.
5. The multilayer coated pesticide fertilizer according to claim 1, wherein the dry film mass of the first coating layer is 1% -5% of the mass of the core layer, the dry film mass of the second coating layer is 1% -5% of the total mass of the core layer and the first functional layer, and the dry film mass of the third coating layer is 1% -5% of the total mass of the multilayer coated pesticide fertilizer.
6. The multilayer coated pesticide fertilizer according to claim 1, wherein the first coating layer is polycaprolactone, the second coating layer is polylactic acid, and the third coating layer is polyvinyl alcohol or sodium alginate.
7. The multilayer coated pesticide fertilizer according to claim 1, wherein the biological stimulation hormone is composed of polyglutamic acid and gamma-aminobutyric acid according to the mass ratio of (2-10): 1, and the biological stimulation hormone accounts for 0.01% -0.2% of the total mass of the multilayer coated pesticide fertilizer.
8. The multilayer coated pesticide fertilizer according to claim 1, wherein the first pesticide and the second pesticide are any one of buprofezin, clothianidin, dinotefuran and chlorantraniliprole, the bactericide is any one of azoxystrobin, hymexazol, metalaxyl, tebuconazole and thifluzamide, and the adhesive is at least one of bentonite, starch and sodium carboxymethyl cellulose.
9. A method for preparing the multilayer coated pesticide fertilizer according to any one of claims 1 to 7, which is characterized by comprising the following steps: S1, preparing a core layer; S2, preparing a first coating layer outside the core layer; S3, preparing a first functional layer outside the first coating layer; s4, preparing a second coating layer outside the first functional layer; S5, preparing a second functional layer outside the second film coating layer; S6, preparing a third coating layer outside the second functional layer, and preparing an outer shell layer outside the third coating layer to obtain the multilayer coated pesticide fertilizer.
10. The preparation method of the multilayer coated pesticide fertilizer according to claim 8, wherein the step S1 is characterized in that the potash fertilizer is crushed to 80-120 meshes, and is uniformly mixed with a first pesticide and an adhesive to obtain a first mixture, deionized water accounting for 5-8% of the mass of the first mixture is added into the first mixture, and then the mixture is stirred to obtain a first wet material, the first wet material is granulated, dried until the water content of the first wet material is less than or equal to 3%, cooled and screened to obtain core layer particles with the particle size of 1-4 mm; The step S2 is specifically that polycaprolactone is dissolved in ethyl acetate to obtain a first coating liquid, the mass ratio of the polycaprolactone to the ethyl acetate is 1 (7-9), the first coating liquid is sprayed on the core layer particles, and the core layer particles are dried and cooled to room temperature to form a first coating layer on the core layer particles to obtain a first master batch; the step S3 is specifically that a balance fertilizer is crushed to 100-120 meshes, and is uniformly mixed with a bactericide and an adhesive to obtain a second mixture, deionized water accounting for 6-9% of the mass of the second mixture is added into the second mixture and then stirred to obtain a second wet material, the first master batch and the second wet material are granulated, dried until the water content of the first master batch and the second wet material is less than or equal to 3%, cooled and screened, and a first functional layer is formed outside the first master batch to obtain first functional layer particles; the step S4 is specifically that polylactic acid is dissolved in a mixed solvent with the volume ratio of dichloromethane to ethanol being 1:1 to form a second coating liquid containing 8-12 wt% of polylactic acid, the second coating liquid is sprayed on the first functional layer particles, and the first coating liquid is dried and cooled to room temperature to form a second coating layer on the first functional layer particles to obtain a second master batch; step S5 is specifically that nitrogen fertilizer is crushed to 100-200 meshes, and is uniformly mixed with a second pesticide and an adhesive to obtain a third mixture, deionized water accounting for 7-10% of the mass of the third mixture is added into the third mixture and is stirred to obtain a third wet material, the second master batch and the third wet material are granulated, dried until the water content of the second master batch and the third wet material is less than or equal to 3%, cooled and screened, and a second functional layer is formed outside the second master batch to obtain second functional layer particles; The step S6 is specifically that polyvinyl alcohol is dissolved in deionized water at 80-90 ℃ to form a third coating liquid containing 8-10wt% of polyvinyl alcohol, the third coating liquid is sprayed on the second functional layer particles, and the second functional layer particles are dried and cooled to room temperature to form a third coating layer on the second functional layer particles to obtain a third master batch; And step S7 is specifically that polyglutamic acid and gamma-aminobutyric acid are mixed and dissolved in deionized water according to the mass ratio of (2-10): 1 to obtain a biostimulant solution, and the biostimulant solution is sprayed on the third master batch to form an outer shell layer, so that the multilayer coated pesticide fertilizer is obtained.

Description

Multilayer coated pesticide fertilizer and preparation method thereof Technical Field The invention belongs to the technical field of agricultural chemicals, and particularly relates to a multilayer coated pesticide fertilizer and a preparation method thereof. Background Most of the existing rice pesticide fertilizers are simply and physically mixed or single coated. The following problems are mainly present: (1) The release is asynchronous, namely the release curve of the fertilizer and the pesticide is not matched with the specific fertilizer requirement rule of the rice and the occurrence period of the plant diseases and insect pests, and effective protection cannot be provided in a key window period. (2) The function is single, the common controlled release fertilizer can only control nutrient release and can not integrate pesticide functions, and the common pesticide fat job is lack of control on pesticide release, so that the pesticide effect period is short or premature release is caused. (3) The environment risk is that the uncontrollable release of pesticides is easy to cause loss and environmental pollution. The rice has different requirements for nutrients (nitrogen, phosphorus and potassium) in different growth periods (such as tillering period, heading period and grouting period), and meanwhile, the occurrence of main diseases and insect pests (such as chilo suppressalis, rice planthoppers and rice blast) also follows a specific rule. The prior art can not realize accurate matching of 'fertilizer needed for supplying and harmful for preventing'. Disclosure of Invention In order to solve the technical problems, the invention provides a multilayer coated pesticide fertilizer which sequentially comprises a core layer, a first coating layer, a first functional layer, a second coating layer, a second functional layer, a third coating layer and a shell layer from inside to outside, wherein the first coating layer is coated outside the core layer, the first functional layer is arranged outside the first coating layer, the second coating layer is coated outside the first functional layer, the second functional layer is arranged outside the second coating layer, the third coating layer is coated outside the second functional layer, and the shell layer is coated outside the third coating layer; The core layer comprises a potash fertilizer and a first pesticide, the first functional layer comprises a balance fertilizer and a bactericide, the second functional layer comprises a nitrogen fertilizer and a second pesticide, and the outer shell layer comprises a biological hormone; the degradation rate of the third coating layer is greater than that of the second coating layer, and the degradation rate of the second coating layer is greater than that of the first coating layer. The mass ratio of the core layer to the first functional layer to the second functional layer is (0.5-1.5). Wherein, in the core layer, the mass fraction of the potash fertilizer is 97-99.5 wt%, the mass fraction of the first pesticide is 0.4-2.9 wt%, and the balance is adhesive; In the first functional layer, the mass fraction of the balance fertilizer is 98-99.8 wt%, the mass fraction of the bactericide is 0.1-1.9 wt%, and the balance is adhesive; in the second functional layer, the mass fraction of the nitrogen fertilizer is 98.5-99.8 wt%, the mass fraction of the second pesticide is 0.4-1.9 wt%, and the balance is adhesive. The nutrient content of the potash fertilizer in the core layer is greater than or equal to 45%, the nutrient content of the balance fertilizer in the first functional layer is greater than or equal to 40%, and the nutrient content of the nitrogen fertilizer in the second functional layer is greater than or equal to 35%. The dry film mass of the first coating layer is 1% -5% of the mass of the core layer, the dry film mass of the second coating layer is 1% -5% of the total mass of the core layer and the first functional layer, and the dry film mass of the third coating layer is 1% -5% of the total mass of the multilayer coated pesticide fertilizer. The first coating layer is polycaprolactone, the second coating layer is polylactic acid, and the third coating layer is polyvinyl alcohol or sodium alginate. The biological stimulation hormone is composed of polyglutamic acid and gamma-aminobutyric acid according to the mass ratio of (2-10): 1, and the biological stimulation hormone accounts for 0.01% -0.2% of the total mass of the multilayer coated pesticide fertilizer. The first pesticide and the second pesticide are any one of buprofezin, clothianidin, dinotefuran and chlorantraniliprole, the bactericide is any one of azoxystrobin, hymexazol, metalaxyl, tebuconazole and thifluzamide, and the adhesive is at least one of bentonite, starch and sodium carboxymethyl cellulose. In order to solve the technical problems, the invention also provides a preparation method of the multilayer coated pesticide fertilizer, which i