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Preparation method for polyaspartic acid zinc as agricultural zinc supplement
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A technology of zinc polyaspartate and calcium polyaspartate, which is applied in the direction of nitrogen fertilizer, can solve the problems of preparing zinc polyaspartate, etc., achieve good solubility, low raw material cost, and prolong shelf life Effect
Active Publication Date: 2013-07-24
HEBEI THINK DO ENVIRONMENT CO LTD
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Problems solved by technology
[0005] In the previous patents, there is no patent for the preparation of zinc polyaspartate
Method used
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Embodiment 1
[0020] The raw materials calcium polyaspartate, acid, and zinc sulfate used in this example are all industrial grades.
[0021] Adopt following method to prepare agricultural zinc supplement zinc polyaspartate:
[0022] a. Add 800 kg of 40% calcium polyaspartate (molecular weight: 5000) solution into the reaction kettle, stir evenly, then add 10kg of 50% concentrated nitric acid into the reaction kettle, stir at room temperature for 10 minutes, and get pH=4.8 acid calcium polyaspartate solution.
[0023] b. Add 342 kg of zinc sulfate solid to the above-mentioned acid calcium polyaspartate solution, heat up to 50°C, stir for 2-4h, and filter through a plate and frame to obtain a zinc polyaspartate solution. The zinc acid zinc solution is subpackaged to obtain the zinc polyaspartic acid zinc supplement product for agriculture. The molecular weight of the product zinc polyaspartate was measured, and the result was 5500.
Embodiment 2
[0025] The difference between this embodiment and embodiment 1 is:
[0026] The concentration of the 800kg calcium polyaspartate used is 20%, the acid added is sulfuric acid, the pH=4.0 after acid addition, the addition amount of zinc sulfate is 171kg, the temperature rises to 40°C, the mass percentage of solids in the product is 19%, the mass percentage of zinc element in the solid is 20%, and the molecular weight of the product zinc polyaspartate is 5400.
Embodiment 3
[0028] The difference between this embodiment and embodiment 1 is:
[0029] The amount of zinc sulfate added is 513kg. In step b, the temperature is raised to 80° C. and stirred for 2 hours. The mass percentage of solids in the product is 45%, the mass percentage of zinc element in the solids is 25%, and the molecular weight of the product zinc polyaspartate is 5800.
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Abstract
The invention discloses a preparation method for polyaspartic acid zinc as an agricultural zinc supplement. The method comprises the following steps of: a, adding a proper amount of acid into a solution of polyaspartic acid calcium, wherein the mass percentage of the solution is 20 to 40 percent, stirring the solution and adjusting the pH value of the solution to 4 to 5 to obtain the acidic polyaspartic acid calcium solution, wherein the molecular weight of the polyaspartic acid calcium is 1,500 to 50,000; and b, adding quantitative amount of zinc sulfate into the acidic polyaspartic acid calcium solution, stirring the solution for 2 to 4 hours at the heating temperature of 40 to 80 DEG C, and filtering the solution to obtain the solution of the polyaspartic acid zinc. The preparation method is simple and convenient to perform and low in cost; the effect is stable; the purity is high; and the solubility of the obtained polyaspartic acid zinc is good.
Description
technical field [0001] The invention belongs to the field of high molecular polymer preparation, in particular to a method for preparing an agricultural zinc supplement. Background technique [0002] According to domestic research for many years, more than 90% of crops are deficient in zinc, which seriously affects the yield and quality of crops. Although there is abundant zinc in the soil, more than 99% of it is mainly in the form of insoluble inorganic salts such as zinc carbonate, which has low solubility and is difficult to be absorbed and utilized by plants, resulting in widespread zinc deficiency in large areas of plants. [0003] The current agricultural zinc supplements are mainly inorganic zinc (such as zinc sulfate) and organic zinc (such as zinc formate). When zinc sulfate is used as zinc supplement, there are problems of low plant absorption and utilization rate and easy loss, and when excessive sulfate is applied, it is easy to cause soil compaction; and when z...
Claims
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Application Information
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