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.
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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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