All-water-soluble fertilizer dyeing solution and preparation method thereof

Abstract

The application discloses a kind of all water-soluble fertilizer dyeing liquid and preparation method thereof, belong to water-soluble fertilizer field, by following component is made: single metal humic acid salt 1 weight part~30 weight part, glycerol 15 weight part~50 weight part, sodium lignosulfonate 3 weight part~12 weight part, potassium pyrophosphate 0.3 weight part~6 weight part, pure water 25 weight part~55 weight part.The application can realize the uniform, firm dyeing of ammonium polyphosphate, and does not destroy its water-solubility and fertilizer efficiency, process is simple, cost controllable.

Description

Technical Field

[0001] This invention relates to the field of water-soluble fertilizers, and in particular to a fully water-soluble fertilizer dyeing solution and its preparation method. Background Technology

[0002] Ammonium polyphosphate (APP) is a highly efficient phosphorus fertilizer with advantages such as high nutrient content, long-lasting effect, and low leaching. Among them, the fully water-soluble fertilizer can be quickly dissolved in water and is suitable for water-saving agricultural scenarios such as drip irrigation and sprinkler irrigation, and has broad application prospects in modern agricultural production.

[0003] To facilitate differentiation and brand recognition of fertilizer products, and to enhance the product's aesthetic appeal, fertilizer granules are typically dyed.

[0004] However, dyeing fully water-soluble fertilizers faces numerous technical challenges, primarily due to the following reasons: First, fully water-soluble ammonium polyphosphate is a short-chain polyphosphate with a low degree of polymerization (n=2-20). Its stable molecular structure and lack of active groups such as carboxyl and hydroxyl groups on its surface, which bind to dye molecules, result in strong chemical inertness and difficulty in achieving firm dye adhesion. Second, its surface exhibits strong polarity, while commonly used pigments (such as carbon black and iron oxide black) are mostly non-polar or weakly polar, leading to poor compatibility and extremely low colorfastness. Third, its fully water-soluble nature makes it easy for dyes to be lost during the dyeing process as the ammonium polyphosphate dissolves, and it is prone to fading due to moisture absorption during subsequent storage or use. Fourth, most dyes are pigment-type with large particles that easily agglomerate, making it difficult to disperse evenly on the surface of the ammonium polyphosphate, resulting in problems such as color spots and color differences. Furthermore, the high-temperature environment during granulation and drying processes may cause thermal decomposition of the dyes, further affecting the dyeing effect. In addition, fertilizer products must meet the requirements of the HG / T 5939-2021 standard, which stipulates that fertilizer-grade ammonium polyphosphate has a moisture content of ≤3.0% and a water-insoluble content of ≤0.5%. Conventional dyeing formulas are prone to resulting in high moisture content or water-insoluble content in the product, which further increases the difficulty of dyeing.

[0005] In the existing dyeing of ammonium polyphosphate water-soluble fertilizers, some use conventional dyeing formulas (pigment carbon black). The dyes used in conventional dyeing formulas often have problems such as poor dispersion stability and insufficient weather resistance, making it difficult to meet the application requirements of fully water-soluble fertilizers. Others use methods such as surface modification of carbon black, addition of coupling agents or OP-10, but these methods often increase the complexity of the process and production costs, and their biodegradation in the soil is too slow, which affects the environment. Summary of the Invention

[0006] To address the aforementioned shortcomings, this invention provides a fully water-soluble fertilizer dyeing solution and its preparation method, which can achieve uniform and firm dyeing of ammonium polyphosphate without damaging its water solubility and fertilizer efficacy. The process is simple and the cost is controllable.

[0007] A fully water-soluble fertilizer dyeing solution is made from the following components: 1 to 30 parts by weight of monometallic humate, 15 to 50 parts by weight of glycerol, 3 to 12 parts by weight of sodium lignosulfonate, 0.3 to 6 parts by weight of potassium pyrophosphate, and 25 to 55 parts by weight of pure water. The weight is expressed in grams, kilograms, thousand kilograms, or ten thousand kilograms.

[0008] In one or more alternative embodiments of the present invention, the single metal humate is 5 to 15 parts by weight, glycerol is 30 to 45 parts by weight, sodium lignosulfonate is 5 to 10 parts by weight, potassium pyrophosphate is 0.5 to 5 parts by weight, and pure water is 30 to 50 parts by weight.

[0009] In one or more alternative embodiments of the present invention, the single metal humate is 8 to 12 parts by weight, glycerol is 35 to 35 parts by weight, sodium lignosulfonate is 7 to 8 parts by weight, potassium pyrophosphate is 1 to 3 parts by weight, and pure water is 35 to 45 parts by weight.

[0010] In one or more optional embodiments of the present invention, the single metal humate is one or more of potassium humate, sodium humate, calcium humate, magnesium humate, zinc humate, iron humate, copper humate, and manganese humate.

[0011] The present invention also provides a method for preparing a fully water-soluble fertilizer dyeing solution.

[0012] A method for preparing a fully water-soluble fertilizer dyeing solution, the method using the above-mentioned fully water-soluble fertilizer dyeing solution formula, includes the following steps: S1, add glycerol and pure water to the stirring container, turn on the stirring, the stirring speed is 100 r / min ~ 250 r / min, the stirring time is 1 min ~ 10 min, and a mixed solvent is obtained; S2, add sodium lignosulfonate to the mixed solvent and continue stirring for 1 min to 10 min until the sodium lignosulfonate is completely dissolved to obtain a dispersion; S3, add potassium pyrophosphate to the dispersion and stir for 1 min to 10 min to completely dissolve the potassium pyrophosphate and form mixture one; S4. Slowly add the single metal humate to the first mixture and stir at 280r / min~330r / min for 5 min~15 min to obtain the fully water-soluble fertilizer dyeing solution.

[0013] Invention principle and beneficial effects: This invention's dyeing formulation effectively solves the problem of difficult dyeing of fully water-soluble fertilizers through the synergistic effect of its components. Specifically, a single metal humate acts as a colorant, possessing both coloring and fertilizer efficiency-enhancing functions. When combined with ammonium polyphosphate, it further improves fertilizer efficiency. Simultaneously, its water solubility ensures good compatibility with fully water-soluble ammonium polyphosphate, preventing insoluble substances from affecting fertilizer application. Glycerol provides a good dispersion and adhesion environment, improving the fluidity and stability of the formulation system and preventing dye component aggregation. It also has good water solubility and compatibility, forming a uniform film on the surface of ammonium polyphosphate, enhancing the adhesion between the dyeing components and the ammonium polyphosphate surface, and improving color fastness. Sodium lignosulfonate improves compatibility and dispersion stability. Potassium pyrophosphate enhances binding force and stabilizes the system. The synergistic effect of these components achieves uniform and firm dyeing of ammonium polyphosphate.

[0014] All components of the dyeing formula of this invention have good water solubility and excellent compatibility with fully water-soluble fertilizers such as APP18-58, APP18-60, and APP24-48. Products dyed using this formula have a moisture content of <2.5% and water-insoluble matter of <0.1%, which is far superior to the requirements of HG / T 5939-2021 standard, which requires moisture content of ≤3.0% and water-insoluble matter of ≤0.5%. At the same time, it still maintains excellent water solubility and does not affect its application in drip irrigation, sprinkler irrigation and other scenarios. The formula contains no heavy metals or toxic and harmful substances and meets the environmental protection standards for fertilizers.

[0015] The dyeing method of this invention is simple and requires no complex surface modification treatment. Dyeing can be achieved simply by preparing conventional dyes, APP dyeing, and extrusion granulation. It is convenient to operate, cost-effective, and suitable for large-scale industrial production. Moreover, the temperature controlled during the dyeing process is at room temperature, which avoids the thermal decomposition of the dye and further ensures the dyeing effect and product stability. The ammonium polyphosphate product dyed by this invention has good color fastness, light resistance, and soil corrosion resistance. It is not easy to fade during long-term storage and use. At the same time, the product has a uniform and beautiful appearance, which facilitates brand identification and product differentiation. Detailed Implementation

[0017] The present invention will be further described below.

[0018] As used in this article: "Prepared from" is synonymous with "comprising". The terms "comprising", "including", "having", "containing", or any other variations thereof as used herein are intended to cover non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that includes the listed elements is not necessarily limited to those elements, but may include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0019] The conjunction "composed of..." excludes any unspecified elements, steps, or components. If used in a claim, this phrase makes the claim closed, excluding materials other than those described, except for associated conventional impurities. When the phrase "composed of..." appears in a clause of the body of a claim rather than immediately following it, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0020] When a quantity, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pair of any upper or preferred value with any lower or preferred value, regardless of whether the range is disclosed individually. For example, when the range “1–5” is disclosed, the described range should be interpreted as including ranges “1–4”, “1–3”, “1–2”, “1–2 and 4–5”, “1–3 and 5”, etc. When numerical ranges are described herein, unless otherwise stated, the range is intended to include its endpoints and all integers and fractions within that range.

[0021] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified, specific conditions in the embodiments are performed under conventional conditions or conditions recommended by the manufacturer. Reagents (materials) or instruments (equipment) used without a specified manufacturer are all commercially available conventional products.

[0023] In these embodiments, unless otherwise specified, the portions and percentages are all by weight.

[0024] "Parts by mass" refers to the basic unit of measurement that expresses the mass ratio of multiple components. One part can represent any unit mass, such as 1g or 2.689g. If we say that component A has "a" parts by mass and component B has "b" parts by mass, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it can mean that the mass of component A is aK and the mass of component B is bK (K is any number representing a multiplier). It is important to understand that, unlike the number of parts by mass, the sum of the mass parts of all components is not limited to 100 parts.

[0025] "And / or" is used to indicate that one or both of the described situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0026] In the following examples and comparative examples, all materials were purchased from the market. Ammonium polyphosphate was a fully water-soluble fertilizer, model APP18-58, with a particle size ≤2mm.

[0027] In this invention: The test method for dyeing uniformity is as follows: observe the product appearance and count the proportion of color spots and color differences.

[0028] The test method for water solubility is as follows: referring to the standard method of HG / T 5939-2021, take 10g of product and add it to 100mL of water, stir for 5min, observe the dissolution, and at the same time test the product's moisture content and water-insoluble content.

[0029] The test method for color fastness is as follows: place the product in a natural environment and expose it to sunlight for 15 days, then observe the fading.

[0030] Example 1 The fully water-soluble fertilizer dyeing formula of this embodiment consists of the following components: 5 parts by weight of potassium humate, 30 parts by weight of glycerol, 5 parts by weight of sodium lignosulfonate, 0.5 parts by weight of potassium pyrophosphate, and 30 parts by weight of pure water.

[0031] A method for preparing a fully water-soluble fertilizer dyeing solution includes the following steps: S1, add glycerol and pure water to a stirring container, turn on the stirring, the stirring speed is 200 r / min, the stirring time is 5 min, and a mixed solvent is obtained.

[0032] S2, add sodium lignosulfonate to the mixed solvent and continue stirring for 5 minutes until the sodium lignosulfonate is completely dissolved to obtain a dispersion.

[0033] S3, add potassium pyrophosphate to the dispersion and stir for 5 minutes to completely dissolve the potassium pyrophosphate and form mixture one; S4. Slowly add potassium humate to the first mixture and stir at 300 r / min for 10 min to obtain a fully water-soluble fertilizer dyeing solution.

[0034] A method for dyeing a fully water-soluble fertilizer includes the following steps: M1, APP18-58 model fully water-soluble fertilizer granules are added to a mixer, and the mixer is turned on at a speed of 200 r / min. The fully water-soluble fertilizer dyeing solution prepared in this embodiment is evenly sprayed onto the surface of the ammonium polyphosphate granules through a nozzle. The amount of dyeing solution sprayed is 4% of the weight of the ammonium polyphosphate granules.

[0035] After spraying M2, continue stirring for 5 minutes, then send the dyed ammonium polyphosphate granules into a mechanical extrusion granulation device to obtain a fully water-soluble fertilizer product.

[0036] The performance of the fully water-soluble fertilizer product prepared in this embodiment was tested, and the results are shown in Table 1 below.

[0037] Example 2 The fully water-soluble fertilizer dyeing formula of this embodiment consists of the following components: 12 parts by weight of potassium humate, 30 parts by weight of glycerol, 5 parts by weight of sodium lignosulfonate, 0.5 parts by weight of potassium pyrophosphate, and 30 parts by weight of pure water.

[0038] A method for preparing a fully water-soluble fertilizer dyeing solution includes the following steps: A method for preparing a fully water-soluble fertilizer dyeing solution includes the following steps: S1, add glycerol and pure water to a stirring container, turn on the stirring, the stirring speed is 200 r / min, the stirring time is 5 min, and a mixed solvent is obtained.

[0039] S2, add sodium lignosulfonate to the mixed solvent and continue stirring for 5 minutes until the sodium lignosulfonate is completely dissolved to obtain a dispersion.

[0040] S3, add potassium pyrophosphate to the dispersion and stir for 5 minutes to completely dissolve the potassium pyrophosphate and form mixture one; S4. Slowly add potassium humate to the first mixture and stir at 300 r / min for 10 min to obtain a fully water-soluble fertilizer dyeing solution.

[0041] A method for dyeing a fully water-soluble fertilizer includes the following steps: M1, APP18-58 model fully water-soluble fertilizer granules are added to a mixer, and the mixer is turned on at a speed of 200 r / min. The fully water-soluble fertilizer dyeing solution prepared in this embodiment is evenly sprayed onto the surface of the ammonium polyphosphate granules through a nozzle. The amount of dyeing solution sprayed is 4% of the weight of the ammonium polyphosphate granules.

[0042] After spraying M2, continue stirring for 5 minutes, then send the dyed ammonium polyphosphate granules into a mechanical extrusion granulation device to obtain a fully water-soluble fertilizer product.

[0043] The performance of the fully water-soluble fertilizer product prepared in this embodiment was tested, and the results are shown in Table 1 below.

[0044] Example 3 The fully water-soluble fertilizer dyeing formula of this embodiment consists of the following components: 15 parts by weight of potassium humate, 30 parts by weight of glycerol, 5 parts by weight of sodium lignosulfonate, 0.5 parts by weight of potassium pyrophosphate, and 30 parts by weight of pure water.

[0045] A method for preparing a fully water-soluble fertilizer dyeing solution includes the following steps: S1, add glycerol and pure water to a stirring container, turn on the stirring, the stirring speed is 200 r / min, the stirring time is 5 min, and a mixed solvent is obtained.

[0046] S2, add sodium lignosulfonate to the mixed solvent and continue stirring for 5 minutes until the sodium lignosulfonate is completely dissolved to obtain a dispersion.

[0047] S3, add potassium pyrophosphate to the dispersion and stir for 5 minutes to completely dissolve the potassium pyrophosphate and form mixture one; S4. Slowly add potassium humate to the first mixture and stir at 300 r / min for 10 min to obtain a fully water-soluble fertilizer dyeing solution.

[0048] A method for dyeing a fully water-soluble fertilizer includes the following steps: M1, APP18-58 model fully water-soluble fertilizer granules are added to a mixer, and the mixer is turned on at a speed of 200 r / min. The fully water-soluble fertilizer dyeing solution prepared in this embodiment is evenly sprayed onto the surface of the ammonium polyphosphate granules through a nozzle. The amount of dyeing solution sprayed is 4% of the weight of the ammonium polyphosphate granules.

[0049] After spraying M2, continue stirring for 5 minutes, then send the dyed ammonium polyphosphate granules into a mechanical extrusion granulation device to obtain a fully water-soluble fertilizer product.

[0050] The performance of the fully water-soluble fertilizer product prepared in this embodiment was tested, and the results are shown in Table 1 below.

[0051] Comparative Example 1 The comparative proportion of the fully water-soluble fertilizer dyeing formula consists of the following components: 5 parts by weight of pigment carbon black, 30 parts by weight of glycerol, 5 parts by weight of sodium lignosulfonate, 0.5 parts by weight of potassium pyrophosphate, and 30 parts by weight of pure water.

[0052] A method for preparing a fully water-soluble fertilizer dyeing solution includes the following steps: S1, add glycerol and pure water to a stirring container, turn on the stirring, the stirring speed is 200 r / min, the stirring time is 5 min, and a mixed solvent is obtained.

[0053] S2, add sodium lignosulfonate to the mixed solvent and continue stirring for 5 minutes until the sodium lignosulfonate is completely dissolved to obtain a dispersion.

[0054] S3, add potassium pyrophosphate to the dispersion and stir for 5 minutes to completely dissolve the potassium pyrophosphate and form mixture one; S4. Slowly add the pigment carbon black to the first mixture and stir at 300 r / min for 10 min to obtain a fully water-soluble fertilizer dyeing solution.

[0055] A method for dyeing a fully water-soluble fertilizer includes the following steps: M1, APP18-58 model fully water-soluble fertilizer granules were added to a mixer and stirred at a speed of 200 r / min. The fully water-soluble fertilizer dyeing solution prepared in this comparative example was evenly sprayed onto the surface of the ammonium polyphosphate granules through a nozzle. The amount of dyeing solution sprayed was 4% of the weight of the ammonium polyphosphate granules.

[0056] After spraying M2, continue stirring for 5 minutes, then send the dyed ammonium polyphosphate granules into a mechanical extrusion granulation device to obtain a fully water-soluble fertilizer product.

[0057] The performance of the fully water-soluble fertilizer product prepared in this comparative example was tested, and the results are shown in Table 1 below.

[0058] Comparative Example 2 The comparative example of a fully water-soluble fertilizer dyeing formula consists of the following components: 5 parts by weight of pigment carbon black and 65.5 parts by weight of pure water.

[0059] A method for preparing a fully water-soluble fertilizer dyeing solution includes the following steps: Add the pigment carbon black and pure water to the mixing container, turn on the stirrer, stir at 300 r / min for 10 min to obtain the fully water-soluble fertilizer dyeing solution.

[0060] A method for dyeing a fully water-soluble fertilizer includes the following steps: M1, APP18-58 model fully water-soluble fertilizer granules were added to a mixer and stirred at a speed of 200 r / min. The fully water-soluble fertilizer dyeing solution prepared in this comparative example was evenly sprayed onto the surface of the ammonium polyphosphate granules through a nozzle. The amount of dyeing solution sprayed was 4% of the weight of the ammonium polyphosphate granules.

[0061] After spraying M2, continue stirring for 5 minutes, then send the dyed ammonium polyphosphate granules into a mechanical extrusion granulation device to obtain a fully water-soluble fertilizer product.

[0062] The performance of the fully water-soluble fertilizer product prepared in this comparative example was tested, and the results are shown in Table 1 below.

[0063] Comparative Example 3 The dyeing formula in this comparative example uses carbon black as the pigment.

[0064] A method for dyeing a fully water-soluble fertilizer includes the following steps: Add M1 and APP18-58 fully water-soluble fertilizer granules to the mixer, turn on the mixer, and set the mixing speed to 200 r / min. Add the comparative example dyeing formula to the mixer. The amount of pigment carbon black is 0.28% of the weight of the ammonium polyphosphate granules (the amount of pigment carbon black is the same as that in comparative example 1 and comparative example 2).

[0065] M2, continue stirring for 10 minutes, then send the dyed ammonium polyphosphate granules into a mechanical extrusion granulation device to obtain a fully water-soluble fertilizer product.

[0066] The performance of the fully water-soluble fertilizer product prepared in this comparative example was tested, and the results are shown in Table 1 below.

[0067] Comparative Example 4 The comparative formula for a fully water-soluble fertilizer dyeing product consists of the following components: 5 parts by weight of potassium ammonium humate, 30 parts by weight of glycerol, 5 parts by weight of sodium lignosulfonate, 0.5 parts by weight of potassium pyrophosphate, and 30 parts by weight of pure water.

[0068] A method for preparing a fully water-soluble fertilizer dyeing solution includes the following steps: S1, add glycerol and pure water to a stirring container, turn on the stirring, the stirring speed is 200 r / min, the stirring time is 5 min, and a mixed solvent is obtained.

[0069] S2, add sodium lignosulfonate to the mixed solvent and continue stirring for 5 minutes until the sodium lignosulfonate is completely dissolved to obtain a dispersion.

[0070] S3, add potassium pyrophosphate to the dispersion and stir for 5 minutes to completely dissolve the potassium pyrophosphate and form mixture one; S4. Slowly add potassium ammonium humate to the first mixture and stir at 300 r / min for 10 min to obtain a fully water-soluble fertilizer dyeing solution.

[0071] A method for dyeing a fully water-soluble fertilizer includes the following steps: M1, APP18-58 model fully water-soluble fertilizer granules were added to a mixer and stirred at a speed of 200 r / min. The fully water-soluble fertilizer dyeing solution prepared in this comparative example was evenly sprayed onto the surface of the ammonium polyphosphate granules through a nozzle. The amount of dyeing solution sprayed was 4% of the weight of the ammonium polyphosphate granules.

[0072] After spraying M2, continue stirring for 5 minutes, then send the dyed ammonium polyphosphate granules into a mechanical extrusion granulation device to obtain a fully water-soluble fertilizer product.

[0073] The performance of the fully water-soluble fertilizer product prepared in this comparative example was tested, and the results are shown in Table 1 below.

[0074] Comparative Example 5 The comparative water-soluble fertilizer dyeing formula consists of the following components: 5 parts by weight of potassium humate, 30 parts by weight of glycerol, 5 parts by weight of sodium lignosulfonate, 0.5 parts by weight of potassium pyrophosphate, and 30 parts by weight of pure water.

[0075] A method for preparing a fully water-soluble fertilizer dyeing solution includes the following steps: S1, add glycerol and pure water to a stirring container, turn on the stirring, the stirring speed is 200 r / min, the stirring time is 5 min, and a mixed solvent is obtained.

[0076] S2, add sodium lignosulfonate to the mixed solvent and continue stirring for 5 minutes until the sodium lignosulfonate is completely dissolved to obtain a dispersion.

[0077] S3, add potassium tripolyphosphate to the dispersion and stir for 5 minutes to completely dissolve the potassium pyrophosphate and form mixture one; S4. Slowly add potassium humate to the first mixture and stir at 300 r / min for 10 min to obtain a fully water-soluble fertilizer dyeing solution.

[0078] A method for dyeing a fully water-soluble fertilizer includes the following steps: M1, APP18-58 model fully water-soluble fertilizer granules were added to a mixer and stirred at a speed of 200 r / min. The fully water-soluble fertilizer dyeing solution prepared in this comparative example was evenly sprayed onto the surface of the ammonium polyphosphate granules through a nozzle. The amount of dyeing solution sprayed was 4% of the weight of the ammonium polyphosphate granules.

[0079] After spraying M2, continue stirring for 5 minutes, then send the dyed ammonium polyphosphate granules into a mechanical extrusion granulation device to obtain a fully water-soluble fertilizer product.

[0080] The performance of the fully water-soluble fertilizer product prepared in this comparative example was tested, and the results are shown in Table 1 below.

[0081] Table 1 In Table 1, the crop plant height ratio and crop fresh weight ratio are calculated based on Comparative Example 3. For example, the crop plant height ratio of Example 1 = crop plant height of Example 1 / crop plant height of Comparative Example 3, and so on.

[0082] From Table 1, we can see that: The products in Examples 1-3 all exhibit excellent dyeing uniformity, with no obvious color spots or color differences; excellent water solubility, very low water-insoluble matter content, and moisture content <2.5% and water-insoluble matter <0.1%, far exceeding the requirements of HG / T 5939-2021 standard; high color fastness, with no obvious fading after 15 days of sun exposure; and, due to the effect of soluble carbon and other components in the formula, crop growth is better than the control, improving fertilizer efficiency. In contrast, Comparative Example 1, using a conventional carbon black formula to dye APP18-58 ammonium polyphosphate, not only showed obvious color spots and color differences, but also poor water solubility, extremely low color fastness, and a water-insoluble matter content of 0.12%; Comparative Example 2, after removing sodium lignosulfonate, showed slight color spots and color differences, and a slight decrease in color fastness, with a product moisture content of 4.7%; Comparative Example 3, using solid carbon black dye directly, showed obvious color spots and color differences, poor water solubility, and extremely low color fastness. This further demonstrates the importance of the synergistic effect of the components in the formulation of this invention, as well as the good adaptability of this formulation to specific sources and types of fully water-soluble fertilizers.

[0083] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A fully water-soluble fertilizer dyeing solution, characterized in that, It is made from the following components: 1 to 30 parts by weight of monometallic humate, 15 to 50 parts by weight of glycerol, 3 to 12 parts by weight of sodium lignosulfonate, 0.3 to 6 parts by weight of potassium pyrophosphate, and 25 to 55 parts by weight of pure water. The weight is expressed in grams, kilograms, thousand kilograms, or ten thousand kilograms.

2. The fully water-soluble fertilizer dyeing solution according to claim 1, characterized in that, The composition consists of 5 to 15 parts by weight of a single metal humate, 30 to 45 parts by weight of glycerol, 5 to 10 parts by weight of sodium lignosulfonate, 0.5 to 5 parts by weight of potassium pyrophosphate, and 30 to 50 parts by weight of pure water.

3. The fully water-soluble fertilizer dyeing solution according to claim 1, characterized in that, The composition consists of 8 to 12 parts by weight of a single metal humate, 35 to 35 parts by weight of glycerol, 7 to 8 parts by weight of sodium lignosulfonate, 1 to 3 parts by weight of potassium pyrophosphate, and 35 to 45 parts by weight of pure water.

4. The fully water-soluble fertilizer dyeing solution according to claim 1, characterized in that, The single metal humate is one or more of potassium humate, sodium humate, calcium humate, magnesium humate, zinc humate, iron humate, copper humate, and manganese humate.

5. A method for preparing a fully water-soluble fertilizer dyeing solution, characterized in that, The preparation method uses the fully water-soluble fertilizer dyeing solution formulation according to any one of claims 1-4, and includes the following steps: S1, add glycerol and pure water to the stirring container, turn on the stirring, the stirring speed is 100r / min~250r / min, the stirring time is 1 min~10 min, and a mixed solvent is obtained; S2, add sodium lignosulfonate to the mixed solvent and continue stirring for 1 min to 10 min until the sodium lignosulfonate is completely dissolved to obtain a dispersion; S3, add potassium pyrophosphate to the dispersion and stir for 1 min to 10 min to completely dissolve the potassium pyrophosphate and form mixture one; S4. Slowly add the single metal humate to the first mixture and stir at 280r / min~330r / min for 5min~15min to obtain the fully water-soluble fertilizer dyeing solution.

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