A functional nano-pre-dispersion slurry for fertilizer and a preparation method thereof

Abstract

This invention provides a functional nano-predispersed slurry for fertilizers and its preparation method, relating to the fields of agricultural chemistry and new materials technology. The slurry is a stable suspension comprising a continuous liquid phase and a dispersed phase. The dispersed phase is a natural nanotube-shaped mineral carrier, on which a plant-derived active composition and an amino acid metal chelate are co-loaded. The natural nanotube-shaped mineral carrier is halloysite nanotubes, which constitute 3%-6% of the slurry by mass. The functional nano-predispersed slurry for fertilizers and its preparation method provided by this invention have the advantages of excellent stability, functional integration and synergistic effects, strong adaptability to downstream processing, standardization, and traceability.

Description

Technical Field

[0001] This invention relates to the fields of agricultural chemistry and new materials technology, specifically to a functional slurry for manufacturing multifunctional compound fertilizers, and more particularly to a stable dispersion slurry and its preparation method that uses natural nanotubes as carriers to jointly load plant active ingredients and amino acid metal chelates. Background Technology

[0002] In the production of functional fertilizers, a major challenge is how to uniformly and stably integrate various active components with different properties (such as hydrophilic plant extracts and trace elements with specific chelation structures) into the fertilizer matrix.

[0003] Existing technologies mostly employ: 1. Dry mixing method: The functional components are physically mixed in the form of solid powder. This method has poor uniformity, the functional components are easily separated, and the active ingredients are easily deactivated during processing and storage.

[0004] 2. Post-soaking method: The granulated fertilizer is soaked in the functional liquid. This method has low loading capacity, uneven distribution (only surface adsorption), and the functional liquid is easily lost.

[0005] 3. Simple blends: These are simple mixtures of various functional liquids used as binders. However, due to the poor compatibility of the components, the mixtures are prone to flocculation, precipitation, or phase separation, making them unstable for long-term storage and resulting in large quality fluctuations between production batches.

[0006] Therefore, there is an urgent need for a standardized functional material that is stable in performance, can be stored and transported industrially, and can ensure the uniformity of functions in downstream fertilizer products. Summary of the Invention

[0007] The present invention aims to provide a functional nano predispersed slurry with high stability, high loading capacity and easy use in downstream fertilizer processing, as well as a preparation method for its large-scale production, in order to solve the industry pain points of unstable and non-uniform functions of intermediate materials in the production of multifunctional fertilizers.

[0008] To solve the above-mentioned technical problems, the functional nano-predispersed slurry for fertilizers provided by the present invention is a stable suspension system, comprising: Continuous liquid phase: mainly water, and plant-derived active compositions and amino acid metal chelates dissolved therein; Dispersed phase: Natural nanotube-shaped mineral carrier uniformly dispersed in the continuous liquid phase; The plant-derived active composition and the amino acid metal chelate are jointly loaded onto the surface and cavity of the natural nanotube mineral carrier through physicochemical reactions.

[0009] Preferably, the natural nanotube mineral carrier is halloysite nanotubes (HNTs), which account for 3%-6% of the mass percentage in the slurry.

[0010] Preferably, the halloysite nanotube has an outer diameter of 50-70 nm, an inner diameter of 10-20 nm, and a length of 0.5-1.5 μm.

[0011] Preferably, the pH value of the slurry is 5.8-6.5, within which the slurry stability is optimal and it is suitable for most fertilizer production environments.

[0012] Preferably, after the slurry is stored at 25°C for 30 days, there is no obvious hard sedimentation or stratification, and it can quickly recover to a uniform state after shaking; its absolute value of Zeta potential is ≥25mV, indicating that the colloidal system is highly stable.

[0013] Preferably, the slurry can be uniformly mixed with conventional nitrogen, phosphorus, and potassium fertilizer solutions or suspensions in any proportion without demulsification or precipitation.

[0014] Preferably, the plant-derived active composition comprises chinaberry extract and scutellaria extract, the total mass percentage of which is 5%-20% in the slurry; wherein the scutellaria extract contains baicalin at a content of not less than 20%, and the chinaberry extract contains azadirachtin at a content of not less than 5%.

[0015] Preferably, the amino acid metal chelate is a mixture of zinc glycinate and iron glycinate, wherein the total mass percentage of zinc and iron in the slurry is 1%-5%.

[0016] Compared with related technologies, the functional nano-predispersed slurry for fertilizer and its preparation method provided by the present invention have the following beneficial effects: 1. Excellent stability: Through effective dispersion and loading of nanocarriers, a thermodynamically stable colloidal system is formed, which solves the compatibility problem when multiple active ingredients are simply mixed, enabling long-term storage and long-distance transportation, and ensuring the continuity and quality stability of downstream production.

[0017] 2. Functional integration and synergistic effect: Active ingredients with different functions (plant stimulation / protection and trace element nutrition) are pre-integrated on the "common platform" of the nanocarrier, which can achieve synergistic release and synergistic effect in subsequent fertilizer processing and use, and the effect is better than the individual use of each component.

[0018] 3. Extremely adaptable to downstream processing: The slurry has good fluidity and can be used directly as a liquid fertilizer for dilution, or as a binder for granulation or a core material for coating. It can be perfectly integrated into existing fertilizer production lines, greatly simplifying the production process of multifunctional fertilizers.

[0019] 4. Standardization and Traceability: As an independent intermediate product, it can establish strict enterprise standards to control the quality of key indicators such as active ingredient content and stability, thereby achieving standardization of the final fertilizer product's function. Detailed Implementation

[0020] The present invention will be described in detail below through embodiments, but these are not intended to limit the scope of the invention. This invention is one of a series of innovations under the same research and development concept, involving multiple aspects such as products, methods, and applications, collectively constructing a complete technical solution.

[0021] Example 1: Preparation of slurry Weigh 10g of dried powder of ethanol extract of neem with a content of 5% neem and 20g of dried powder of water extract of scutellaria with a content of 20% baicalin, dissolve them in 500mL of deionized water and stir to dissolve.

[0022] Weigh 5g of zinc glycinate (20% Zn content) and 5g of iron glycinate (10% Fe content), add them to the above solution, stir until completely dissolved, and adjust the pH to 6.2 with citric acid.

[0023] While stirring continuously, slowly add 30g of halloysite nanotube powder (HNTs, outer diameter 50-70nm).

[0024] The mixture was transferred to a high-shear dispersing emulsifier and subjected to a shear reaction at 2800 rpm and 35°C for 2.5 hours.

[0025] After the reaction was completed, deionized water was added to bring the total volume to 1000g, yielding functional nano-predispersed slurry C with a solid content of approximately 7%. Its pH was measured to be 6.3 and its Zeta potential to be -28.5mV.

[0026] Example 2: Stability of the slurry and downstream application testing Stability test: Slurry C was dispensed into sealed transparent bottles and stored under refrigerated conditions at 4℃, ambient conditions at 25℃, and accelerated conditions at 40℃, respectively. After 30 days, no visible layering or precipitation was observed in any of the samples, and they returned to homogeneity with slight shaking. The baicalin retention rate in the 40℃ sample was >95%, and the zinc ion dissociation rate was <8%.

[0027] Downstream granulation application: Slurry C was used as the sole binder and mixed with urea-ammonium phosphate-potassium chloride powder pulverized to 80 mesh, then granulated in a disc granulator. Good pellet formation and satisfactory particle strength were observed. After drying, the granules were tested, and the coefficients of variation for the distribution of baicalin and zinc on the particle cross-section were less than 15%, demonstrating a highly uniform distribution of functional components.

[0028] Liquid fertilizer compound: Dilute slurry C at a ratio of 1:50 and mix it with a solution of water-soluble fertilizer containing macro-elements (N-P2O5-K2O is 20-20-20). The mixture should remain clear and transparent without any precipitation and can be used directly for drip irrigation.

[0029] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A functional nanometric pre-dispersion slurry for fertilizers, characterized by, The slurry is a stable suspension comprising a continuous liquid phase and a dispersed phase. The dispersed phase is a natural nanotube mineral carrier, and the plant-derived active composition and amino acid metal chelate are co-loaded on the carrier.

2. The functional nano-predispersed slurry for fertilizer according to claim 1, characterized in that, The natural nanotube mineral carrier is halloysite nanotubes, which account for 3%-6% of the mass percentage in the slurry.

3. The functional nano-predispersed slurry for fertilizer according to claim 2, characterized in that, The halloysite nanotubes have an outer diameter of 50-70 nm, an inner diameter of 10-20 nm, and a length of 0.5-1.5 μm.

4. The functional nano-predispersed slurry for fertilizer according to claim 1, characterized in that, The slurry has a pH value of 5.8-6.5, and after standing at 25°C for 30 days, there is no hard sediment, and it can be restored to uniformity by shaking.

5. The functional nano-predispersed slurry for fertilizer according to claim 1, characterized in that, The slurry has an absolute Zeta potential value ≥25 mV and is used for functional nano predispersed slurry for fertilizers and its preparation method.

6. The functional nano-predispersed slurry for fertilizer according to claim 1, characterized in that, The plant-derived active composition comprises neem extract and scutellaria extract; wherein the scutellaria extract contains baicalin at a content of not less than 20%, and the neem extract contains azadirachtin at a content of not less than 5%.

7. The functional nano-predispersed slurry for fertilizer according to claim 1, characterized in that, The amino acid metal chelate contains zinc glycine and / or iron glycine.

8. A method for preparing a functional nano-predispersed slurry as described in any one of claims 1-7, characterized in that, The process includes the following steps: dissolving the plant-derived active composition and amino acid metal chelate in an aqueous phase and adjusting the pH to 5.8-6.5; adding the natural nanotube mineral carrier under stirring; and then carrying out a loading and composite reaction at 25-45°C under shear force to obtain a homogeneous slurry.

9. The method for preparing the functional nano-predispersed slurry according to claim 8, characterized in that, The shear force is provided by a high-speed dispersion device with a rotation speed of 2000-3000 rpm and a reaction time of 1.5-2.5 hours.

10. The application of the slurry according to any one of claims 1-7 in the preparation of multifunctional compound fertilizer, characterized in that, The slurry is used as a binder or functional additive in fertilizer granulation, coating, or liquid fertilizer compounding.