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Method for preparing poly-aspartic potassium used in plant growth accelerator and use

A technology for potassium polyaspartate and plant growth promotion, applied in the direction of organic fertilizers, etc., can solve the problems of lowering the polymerization reaction temperature, shortening the reaction time, and high polymerization temperature, and achieves increased yield, balanced plant nutrients, and low reaction temperature. Effect

Inactive Publication Date: 2010-12-08
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The catalyst can not only reduce the polymerization reaction temperature, shorten the reaction time and improve the color of the product, but also does not agglomerate in the reaction and is easy to realize industrial production, so as to overcome the high polymerization temperature, long time, deep color and easy agglomeration in the existing method Aggregation method for

Method used

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  • Method for preparing poly-aspartic potassium used in plant growth accelerator and use
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  • Method for preparing poly-aspartic potassium used in plant growth accelerator and use

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Effect test

Embodiment 1

[0029] Embodiment 1: Preparation of potassium polyaspartate

[0030] 133.00 g of aspartic acid (1 mol), 1.24 g of boric acid (0.02 mol) and 5.22 g of potassium sulfate (0.03 mol) were added to 139.46 g of water, dissolved and then removed in a rotary evaporator. The dried mixture was put into a four-necked flask and heated to about 190° C. in an oil bath. After 8.0 hours, 104.11 g of light yellow polysuccinimide was obtained. According to the weight loss method, the conversion rate was 98.19%. Add 133.00 g of water to the obtained polysuccinimide and heat it to 70° C., and slowly add 224 g of 25% potassium hydroxide aqueous solution at this temperature for hydrolysis to obtain a yellow viscous liquid with a solid content of not less than 35%. Potassium polyaspartate solution, molecular weight test 8,750.

Embodiment 2

[0031] Embodiment 2: the preparation of potassium polyaspartate

[0032] 133.00 g of aspartic acid (1 mol), 3.1 g of boric acid (0.05 mol) and 8.70 g of potassium sulfate (0.05 mol) were added to 144.80 g of water, and then the water was removed in a rotary evaporator. The dried mixture was put into a four-necked flask and heated to about 180° C. in an oil bath. After 4.5 hours, 109.02 g of light yellow polysuccinimide was obtained. According to the weight loss method, the conversion rate was 99.4%. Add 133g of water to the obtained polysuccinimide and heat it to 70°C, and slowly add 224g of 25% potassium hydroxide aqueous solution at this temperature for hydrolysis to obtain a yellow viscous liquid with a solid content of not less than 35%. Potassium Aspartate Solution, Molecular Weight Tested 8,600.

Embodiment 3

[0033] Embodiment 3: the preparation of potassium polyaspartate

[0034] 133.0 g of aspartic acid (1 mol), 3.1 g of boric acid (0.05 mol) and 8.7 g of potassium sulfate (0.05 mol) were added to 144.8 g of water, and then the water was removed in a rotary evaporator. The dried mixture was put into a four-necked flask and heated to about 180° C. in an oil bath. After 4.5 hours, 109.0 g of light yellow polysuccinimide was obtained. According to the weight loss method, the conversion rate was 98.4%. Add 133g of water to the obtained polysuccinimide and heat it to 70°C, and slowly add 224g of 25% potassium hydroxide aqueous solution at this temperature for hydrolysis to obtain a yellow viscous liquid with a solid content of not less than 35%. Potassium Aspartate Solution, Molecular Weight Tested 8,600.

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Abstract

The invention belongs to the technical field of fertilizer, and in particular relates to a preparation method and application of poly-aspartic potassium used for plant growth accelerators. Poly-succinimide is generated from aspartate by a thermal polymerization method under the combined effect of boric acid and potassium (hydrogen) sulfate as catalysts, and the catalysts directly hydrolyze the Poly-succinimide into the poly-aspartic potassium without separation under the action of potassium hydroxide. Poly-aspartic acid synthesized by the method has the characteristics of uniform molecular weight distribution, high purity and high yield; moreover, as the boric acid and the potassium (hydrogen) sulfate added as catalysts are not separated from a product, production process is simplified; in addition, the contained boric acid and potassium (hydrogen) sulfate can be used as the plant growth accelerators and can be directly used as additives for nitrogen fertilizer synergism. Compared with the common poly-aspartic acid, the poly-aspartic potassium can improve the rate that plants utilize nitrogen fertilizer, and boron, potassium and sulfur in the poly-aspartic potassium can improve nutritional components. Experiments prove that the poly-aspartic acid synthesized by the method not only can increase the rate that plants utilize nitrogen fertilizer, but also balances the nutritionalcomponents of the nitrogen fertilizer.

Description

technical field [0001] The invention belongs to the technical field of chemical fertilizers, and in particular relates to a preparation method and application of potassium polyaspartate used as a plant growth promoter. Background technique [0002] Chemical fertilizers play a key role in the growth of crop yields. According to the statistical data of the Food and Agriculture Organization of the United Nations (FAO) abroad for many years, the role of chemical fertilizers in increasing yields accounts for about 40% to 60%. Among nitrogen, phosphorus and potassium fertilizers, nitrogen fertilizers account for more than 70% of my country's use. According to statistics, my country has less than 10% of the world's arable land, but the use of nitrogen fertilizer has reached the first place in the world, accounting for nearly 30% of the world's total, and there is a growing trend. At present, the utilization rate of nitrogen fertilizer by crops in developed countries is 50% to 60%,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05F11/00C08G73/10
Inventor 张冰如李风亭李宝成
Owner TONGJI UNIV
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