CN113214015A - Liquid boron fertilizer and preparation method thereof - Google Patents

Abstract

A liquid boric fertilizer and a preparation method thereof, which comprises 43-52 parts of boric acid, 48-57 parts of ligand solvent and 0.01 part of defoaming agent by weight; the ligand solvent comprises the following components in parts by weight: 34-45 parts of water and 12-14 parts of N, N-dimethyl-1,3-propane diamine. The preparation method comprises the following steps: (1) adding N, N-dimethyl-1,3-propane diamine into water at normal temperature in batches according to a proportion, and continuously stirring for 30min to obtain a ligand solvent; (2) and (2) adding boric acid into the ligand solvent obtained in the step (1) while stirring, stirring for 1-2 h for completely dissolving the boric acid, then adding a defoaming agent, and continuously stirring for 15min to obtain a uniform solution, namely the liquid boron fertilizer. The boron fertilizer is low in concentration and strong in stability, and is suitable for short-distance pressure use without transportation cost. The production process is simple, the production can be carried out at normal temperature, and the equipment requirement is not high.

Description

Liquid boron fertilizer and preparation method thereof

Technical Field

The invention relates to a liquid boron fertilizer and a preparation method thereof.

Background

Boron is a necessary trace nutrient element for crops, has specific physiological functions and functions in the growth process of the crops, cannot be replaced by other nutrient elements, and can strengthen certain important physiological functions of the crops although not being a composition component of various organic matters in the crops. Sufficient boron supply, luxuriant plant growth, full seeds, good root system and high yield; on the contrary, the supply of boron is insufficient, the plant growth is poor, and the quality and the yield of the product are reduced; when the boron is seriously deficient, even the particles are not harvested. Especially has obvious yield increasing effect and quality improvement on boron deficiency sensitive crops, such as rape, cotton, peanut, soybean, sunflower, beet, vegetables, fruit trees and the like.

At present, the boron fertilizer is relatively complete in variety and comprises particles, powder and liquid. The particle is mainly used for basal application, the powder can be used for foliage spraying, but the solubility is small, and the liquid boron fertilizer has high intersolubility with water and can be quickly absorbed by plant leaves, so that the utilization rate of the boron fertilizer is greatly improved. Although the boron content of the existing liquid boron fertilizer in the market can reach 150g/L, the storage stability is insufficient, particularly, crystallization is generated in a low-temperature environment, certain difficulty is met in actual popularization, and the liquid boron fertilizer cannot be widely applied and popularized.

According to the actual fertilizer application scene, a high-concentration product is not needed in many cases, and a low-concentration qualified product is applied under the condition of low-rate dilution and has the same fertilizer effect with the high-concentration high-rate dilution. In addition, the production of high-concentration stable boron fertilizer requires increased production cost and risk of unstable storage, and if there is no transportation cost pressure in the base market near the factory and in the surrounding cities, the selection of low-concentration stable boron fertilizer is also an economic solution.

Disclosure of Invention

The invention aims to solve the first technical problem of providing a liquid boron fertilizer which has the effects of flower retention and fruit setting and has good low-concentration stability.

The second technical problem to be solved by the invention is to provide the preparation method of the liquid boron fertilizer, which is simple and easy to operate.

In order to solve the first technical problem, the invention provides a liquid boric fertilizer which comprises 43-52 parts by weight of boric acid, 48-57 parts by weight of a ligand solvent and 0.01 part by weight of a defoaming agent;

the ligand solvent comprises the following components in parts by weight: 34-45 parts of water and 12-14 parts of N, N-dimethyl-1,3-propane diamine.

Preferably, the anti-foaming agent comprises 43 parts of boric acid, 57 parts of ligand solvent and 0.01 part of defoaming agent in parts by weight;

the ligand solvent comprises the following components in parts by weight: 45 parts of water and 12 parts of N, N-dimethyl-1,3-propane diamine.

The defoaming agent is a polyoxypropylene glyceryl ether substance, eliminates bubbles generated in the stirring process of the high-concentration boron fertilizer, and is convenient for split charging and storage.

For the sake of simplicity, the liquid boron fertilizer of the present invention is hereinafter referred to as "boron fertilizer".

The boron fertilizer has the advantages that: the boron fertilizer is low in concentration and strong in stability, and is suitable for short-distance pressure use without transportation cost.

In order to solve the second technical problem, the invention provides a preparation method of the flower-keeping and fruit-setting stable high-concentration boron fertilizer, which comprises the following steps:

(1) adding N, N-dimethyl-1,3-propane diamine into water at normal temperature in batches according to a proportion, and continuously stirring for 30min to obtain a ligand solvent;

(2) and (2) adding boric acid into the ligand solvent obtained in the step (1) while stirring, stirring for 1-2 h for completely dissolving the boric acid, then adding a defoaming agent, and continuously stirring for 15min to obtain a uniform solution, namely the liquid boron fertilizer.

For the sake of simple explanation, the following methods for preparing a liquid boron fertilizer are all referred to as the present method.

The method has the advantages that: the method has simple production process, can be used for production at normal temperature, and has low equipment requirement.

Detailed Description

Example 1

The liquid boric fertilizer comprises 43g of boric acid, 45g of water, 12g of N, N-dimethyl-1,3-propane diamine and 0.01g of defoaming agent in parts by weight;

the preparation method comprises the following steps:

(1) adding 12g N, N-dimethyl-1,3-propane diamine into 45g of water at normal temperature in batches according to a proportion, and continuously stirring for 30min to obtain a ligand solvent;

(2) adding 43g of boric acid into the ligand solvent obtained in the step (1) in batches while stirring, stirring for 1 hour to completely dissolve the boric acid, then adding 0.01g of defoaming agent, and continuously stirring for 15 minutes to obtain a solution, namely a liquid boron fertilizer, which is marked as boron fertilizer I;

through detection, the boric acid in the boron fertilizer I accounts for 43% by mass, the boron accounts for 7.5% by mass, and the boron concentration is 100 g/L;

example 2

The liquid boric fertilizer comprises 49g of boric acid, 38g of water, 13g of N, N-dimethyl-1,3-propane diamine and 0.01g of defoaming agent in parts by weight;

the preparation method comprises the following steps:

(1) adding 13g N, N-dimethyl-1,3-propane diamine into 38g of water at normal temperature in batches according to a proportion, and continuously stirring for 30min to obtain a ligand solvent;

(2) adding 49g of boric acid into the ligand solvent in the step (1) in batches while stirring, stirring for 1h for completely dissolving the boric acid, then adding 0.01g of defoaming agent, and continuously stirring for 15min to obtain a solution, namely a liquid boron fertilizer, which is marked as boron fertilizer II;

according to detection, in the boron fertilizer II, the mass percent of boric acid is 49%, the mass percent of boron is 8.5%, and the mass concentration of boron is 110 g/L;

example 3

The liquid boric fertilizer comprises 52g of boric acid, 34g of water, 14g of N, N-dimethyl-1,3-propane diamine and 0.01g of defoaming agent in parts by weight;

the preparation method comprises the following steps:

(1) adding 14g N, N-dimethyl-1,3-propane diamine into 34g of water at normal temperature in batches according to a proportion, and continuously stirring for 30min to obtain a ligand solvent;

(2) adding 52g of boric acid into the ligand solvent in the step (1) in batches while stirring, stirring for 1.5h for complete dissolution of the boric acid, then adding 0.01g of defoaming agent, and continuously stirring for 15min to obtain a solution, namely a liquid boron fertilizer, which is marked as boron fertilizer III;

the detection proves that the boric acid in the boron fertilizer III accounts for 52 percent by mass, the boron accounts for 9 percent by mass, and the boron concentration is 120 g/L.

The N, N-dimethyl-1,3-propane diamine is purchased from https:// chemicals. thermofisher. cn/, English name N, N-dimethyl-1,3-propane diamine, molecular formula: c₅H₁₄N₂Molecular weight 102, purity 99%, CAS: 109-55-7.

The liquid boron fertilizers I, II and III, B is more than or equal to 100g/L, and accords with the trace element water-soluble fertilizer NY/T1428-2010, and the specific adding amounts and contents of the boron fertilizers I, II and III are shown in the following table 1:

table 1 examples used raw material ratios and boron contents of boron fertilizers

Comparative storage experiment:

1) sample (I)

The boron fertilizers i, ii and iii provided in the above examples 1 to 3 and the boron fertilizer i-1 provided in the comparative example 1, the preparation process of the comparative example boron fertilizer is as follows:

comparative example 1

The boric fertilizer comprises 43g of boric acid, 57g of water and 0.01g of defoaming agent;

the preparation process of the boric fertilizer comprises the following steps:

adding 43g of boric acid into water in batches while stirring according to a proportion, gradually generating crystals at the bottom of the solution along with stirring, slowing down the dissolving speed of the boric acid until the boric acid is insoluble, and obtaining a mixed system of the solution and the boric acid crystals, namely the boric fertilizer I-1;

in the boric fertilizer I-1, the mass percent of boric acid is 43 percent, and the mass percent of boron is 7.5 percent.

The specific addition amount and content of the boron fertilizer of comparative example 1 are shown in the following table 2:

table 2 comparative example 1 boron fertilizer raw material ratio and boron content

2) Device

A constant temperature box, DGF-9050A type, Yangzhou Hui Ke electronics Limited company;

BCD-228D11SY, Haixin Sound (Guangdong) refrigerator, Inc.;

3) experimental methods

The boron fertilizer participating in the experiment is subjected to a storage experiment, stored for 2 months at-7, 4, 25 and 54 ℃, whether the bottom of the solution is crystallized or precipitated is observed, the stability of the experimental sample is examined, and the storage result is shown in the following table 3.

TABLE 3 storage of different boron fertilizer samples

Note: "none" means no crystallization or precipitation was found during the storage experiment;

b. a few³⁰"means that a small amount of crystals or precipitates are found out on the 30 th day during the storage experiment, and a large amount of crystals or precipitates are generated after the storage is continued after the small amount of crystals or precipitates appear;

c. "having⁰"means that the sample is not completely dissolved or that a large amount of crystals, precipitates, has been generated before storage.

From the storage experiments, it can be seen from table 3:

1. in the whole storage process of the boron fertilizer I provided by the invention, no crystal or precipitate is found, which shows that the boron fertilizer I provided by the invention has better stability, the mass percent of boric acid is 43%, the mass percent of boron is 7.5%, the mass concentration of boron is 100g/L, the boron fertilizer meets the technical index requirements of the agricultural standard NY/T1428-2010 of the trace element water-soluble fertilizer, and the boron fertilizer is a qualified product;

2. in the whole process of storage, a small amount of crystals or precipitates are found in 30 th day and 50 th day when the boron fertilizer II is stored at minus 7 ℃ and 4 ℃, and a small amount of crystals or precipitates are not found at other temperatures, which shows that the boron fertilizer II provided by the invention has certain stability, the mass percent of boric acid is 49%, the mass percent of boron is 8.5%, the mass concentration of boron is 110g/L, and the boron fertilizer II can be applied in seasons with higher temperature or areas with higher temperature;

3. in the whole process of storage, a small amount of crystals or precipitates are found in 15 th day and 40 th day when the boron fertilizer III is stored at minus 7 ℃ and 4 ℃, and a small amount of crystals or precipitates are not found at other temperatures, which shows that the boron fertilizer III provided by the invention has certain stability, the mass percent of boric acid is 52%, the mass percent of boron is 9%, the mass concentration of boron is 120g/L, and the boron fertilizer III can be applied in seasons with higher temperature or areas with higher temperature;

4. according to the boron fertilizer I-1 provided by the comparative example 1, as the solubility of boric acid is 5.6g/100mL at normal temperature, namely the mass percent of the boric acid is 5.6%, the addition amount of the boric acid in the comparative example 1 is far more than the solubility, the boric acid can not be completely dissolved or the content of boron in a dissolved boric acid solution is low under the condition that other solvents except water are not added, so that the technical index requirements of the agricultural standard NY/T1428-;

in conclusion, the solubility of boric acid in water is low, in order to increase the solubility, a ligand solvent is prepared in advance, the ligand solvent comprises water and N, N-dimethyl-1,3-propane diamine, the boric acid and the ligand solvent are mutually cooperated, and the stability of borate generated between the boric acid and the ligand is enhanced through intermolecular van der Waals force (hydrogen bonds or ionic bonds).

While there have been shown and described the fundamental principles of the invention, the principal features thereof, and the advantages thereof, it will be understood by those skilled in the art that the invention is not limited by the embodiments described above, which are given by way of illustration of the principles of the invention, but is capable of numerous changes and modifications without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (3)

1. A liquid boron fertilizer and a preparation method thereof are characterized in that: the composite material comprises 43-52 parts by weight of boric acid, 48-57 parts by weight of ligand solvent and 0.01 part by weight of defoaming agent;

the ligand solvent comprises the following components in parts by weight: 34-45 parts of water and 12-14 parts of N, N-dimethyl-1,3-propane diamine.

2. The liquid boric fertilizer as claimed in claim 1, wherein: comprises 43 parts of boric acid, 57 parts of ligand solvent and 0.01 part of defoaming agent by weight;

the ligand solvent comprises the following components in parts by weight: 45 parts of water and 12 parts of N, N-dimethyl-1,3-propane diamine.

3. The method for preparing the liquid boric fertilizer according to any one of claims 1-2, characterized by comprising the following steps:

(1) adding N, N-dimethyl-1,3-propane diamine into water at normal temperature in batches according to a proportion, and continuously stirring for 30min to obtain a ligand solvent;

(2) and (2) adding boric acid into the ligand solvent obtained in the step (1) while stirring, stirring for 1-2 h for completely dissolving the boric acid, then adding a defoaming agent, and continuously stirring for 15min to obtain a uniform solution, namely the liquid boron fertilizer.