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Preparation method of high molecular weight polyasparagic acid

A polyaspartic acid and high molecular weight technology, applied in the field of polyaspartic acid, can solve the problems of product use limitation and small molecular weight of polyaspartic acid, and achieve excellent moisturizing performance and the effect of promoting plant growth.

Inactive Publication Date: 2006-11-29
NANJING UNIV OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] For the preparation method of polyaspartic acid, there are patent reports that aspartic acid monomer can be directly polymerized, and there are also patent reports that maleic acid or its ammonium salt can be directly synthesized, but the polyaspartic acid synthesized by these methods The molecular weight of the product is small, and the use of the product is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] In a 1000ml beaker, add 50g of L-aspartic acid and 25g of phosphoric acid, stir evenly, put it in a vacuum oven, control the reaction temperature to 180°C, and carry out the polycondensation reaction under the condition of a vacuum of 0.088MPa. After the reaction is carried out for 2 hours, the The reactant is taken out, crushed, and passed through a 100-mesh sieve, and the reaction is continued. After the reaction was carried out for 1 hour, the material was taken out, crushed, and passed through a 100-mesh sieve to continue the reaction. Repeat the above process once. The product was washed with water until neutral; dried under normal pressure at 80°C for 2 hours.

[0009] The weight-average molecular mass (M) of polyaspartic acid was determined by gel chromatography (GPC). W ). The gel column is TSK GMPWXL 7.8×300, and the mobile phase is 0.05M Na 2 SO 4 , the flow rate is 0.5ml / min, with polyacrylic acid as the standard sample. The M of the product was measure...

Embodiment 2

[0011] In a 1000ml beaker, add 50g of L-aspartic acid and 20g of phosphoric acid, stir evenly, put it in a vacuum oven, control the reaction temperature to 200°C, and carry out the polycondensation reaction under the condition of a vacuum of 0.09MPa. After the reaction is carried out for 2 hours, The reactants were taken out, crushed, passed through a 100-mesh sieve, and then continued to react. After 1 hour, the material was taken out, crushed, passed through a 100-mesh sieve, and continued to react. Repeat the above process eight times. The product was washed with water until neutral; dried under normal pressure at 80°C for 2 hours. The weight-average molecular mass (M) of polyaspartic acid was determined by gel chromatography (GPC). W ) is 185000.

Embodiment 3

[0013] In a 1000ml beaker, add 50g of L-aspartic acid and 12.5g of phosphoric acid, stir evenly, put it into a vacuum oven, control the reaction temperature at 220°C, and carry out polycondensation reaction under the condition of vacuum degree of 0.09MPa. After the reaction is carried out for 2 hours , take out the reactants, crush them, pass through a 100-mesh sieve, and continue the reaction. After the reaction was carried out for 1 hour, the material was taken out, crushed, and passed through a 100-mesh sieve to continue the reaction. Repeat the above process three times. The product was washed with water until neutral, and dried under normal pressure at 80°C for 2 hours. The weight-average molecular mass (M) of polyaspartic acid was determined by gel chromatography (GPC). W ) is 112000.

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Abstract

A process for preparing high-molecular polyaspartic acid includes such steps as mixing aspartic acid with catalyst, polycondensating reaction, grinding, sieving, polycondensating reaction and grinding again, washing until it becomes neutral, and drying. It can be used as the scale-inhibiting disperser for cooling water, fertilizer synergist, etc.

Description

technical field [0001] The invention relates to a method for preparing polyaspartic acid (PASP), in particular to the preparation of high-molecular-weight polyaspartic acid required for oil field viscosity reducers and water-absorbing resins. It belongs to the technical field of polyaspartic acid. technical background [0002] For the preparation method of polyaspartic acid, there are patent reports that aspartic acid monomer can be directly polymerized, and there are also patent reports that maleic acid or its ammonium salt can be directly synthesized, but the polyaspartic acid synthesized by these methods The molecular weight of the product is small, and the use of the product is limited. Contents of the invention [0003] The object of the present invention is to provide a method for preparing high-molecular-weight polyaspartic acid with aspartic acid as raw material, using aspartic acid as raw material, adding a catalyst, and at a certain temperature, polyaspartic aci...

Claims

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Application Information

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IPC IPC(8): C08G69/08
Inventor 冷一欣欧阳平凯芮新生
Owner NANJING UNIV OF TECH
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