A kind of polyaspartic acid compound and its preparation method and application

A polyaspartic acid and compound technology, which is applied in the agricultural field, can solve the problems of poor thermal stability, poor compression resistance, and low water retention effect of hydrogels, and achieves improved thermodynamic stability, excellent water release performance, and good effect. good effect

Active Publication Date: 2020-10-27
辽宁东北丰专用肥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the existing polyaspartic acid is used for water retention in agriculture and forestry, it is found that its compression resistance is poor and it is easily broken. The formed hydrogel has extremely poor thermal stability and is easy to decompose when heated. agent

Method used

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  • A kind of polyaspartic acid compound and its preparation method and application
  • A kind of polyaspartic acid compound and its preparation method and application
  • A kind of polyaspartic acid compound and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of a polyaspartic acid complex, comprising the steps of:

[0023] S1. Dissolve 2kg of sodium hyaluronate in 80kg of water, adjust the pH of the system to 5.8-6.4 with 0.4mol / L hydrochloric acid, and add 2kg of carbodiimide and 0.2kg of N-hydroxysuccinimide in turn under stirring , add 1kgL-cysteine ​​ethyl ester hydrochloride and stir for 5h to obtain prefabricated material;

[0024] S2. Mix 12kg polysuccinimide and 40kg sodium hydroxide solution with a concentration of 1.5mol / L, adjust the temperature to 55°C and stir for 50min, adjust the pH value of the system to 4.8-5.5 with a concentration of 68wt% phosphoric acid, and add 3kg of prefabricated material 1 kg of phenylacrylamide was stirred for 8 hours, 0.2 kg of ethylene glycol diglycidyl ether was added and reacted for 40 minutes at a reaction temperature of 60° C., precipitated with methanol, purified, and dried in vacuum to obtain a polyaspartic acid complex.

Embodiment 2

[0026] A preparation method of a polyaspartic acid complex, comprising the steps of:

[0027] S1. Dissolve 8kg of sodium hyaluronate in 50kg of water, adjust the pH of the system to 5.8-6.4 with 1.1mol / L hydrochloric acid, and add 1kg of carbodiimide and 0.8kg of N-hydroxysuccinimide in turn under stirring , add 0.5kgL-cysteine ​​ethyl ester hydrochloride and stir for 10h to obtain prefabricated material;

[0028] S2. Mix 4kg of polysuccinimide and 60kg of 1mol / L sodium hydroxide solution, adjust the temperature to 65°C and stir for 30min, adjust the pH of the system to 4.8-5.5 with 77wt% phosphoric acid, add 1kg of prefabricated material, Stir 2kg of phenylacrylamide for 4 hours, add 0.8kg of ethylene glycol diglycidyl ether and react for 20 minutes at a reaction temperature of 70°C, precipitate with methanol, purify, and dry in vacuo to obtain a polyaspartic acid complex.

Embodiment 3

[0030] A preparation method of a polyaspartic acid complex, comprising the steps of:

[0031] S1. Dissolve 6kg of sodium hyaluronate in 60kg of water, adjust the pH of the system to 5.8-6.4 with 1mol / L hydrochloric acid, and add 1.3kg of carbodiimide and 0.6kg of N-hydroxysuccinimide in turn under stirring , add 0.6kgL-cysteine ​​ethyl ester hydrochloride and stir for 8h to obtain prefabricated material;

[0032] S2. Mix 6kg polysuccinimide and 55kg sodium hydroxide solution with a concentration of 1.2mol / L, adjust the temperature to 62°C and stir for 35min, adjust the pH value of the system to 4.8-5.5 with a concentration of 76wt% phosphoric acid, add 1.5kg prefabricated 1.7kg of phenylacrylamide was stirred for 5 hours, and 0.6kg of ethylene glycol diglycidyl ether was added to react for 25 minutes at a reaction temperature of 66°C. Precipitate with methanol, purify, and dry in vacuo to obtain a polyaspartic acid complex.

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Abstract

The invention discloses a preparation method of a polyaspartic acid complex, wherein the preparation method includes the steps: dissolving sodium hyaluronate in water, adjusting the pH value of the system to 5.8-6.4, adding carbodiimide and N-hydroxy succinimide successively in a stirring state, adding L-cysteine ethyl ester hydrochloride, and stirring to obtain a prefabricated material; and mixing polysuccinimide and a sodium hydroxide solution, adjusting the temperature, stirring, adjusting the pH value of the system to 4.8-5.5, adding the prefabricated material and phenylacrylamide, stirring, adding ethylene glycol diglycidyl ether, carrying out a reaction, precipitating with methanol, purifying, and carrying out vacuum drying to obtain the polyaspartic acid complex. The invention alsodiscloses the polyaspartic acid complex which is prepared by the preparation method of the polyaspartic acid complex. The invention also discloses an application of the polyaspartic acid complex. Thepolyaspartic acid complex has the advantages of excellent water absorption and release performance, high compressive strength, excellent thermal stability, remarkable prolonging of water retention time, and good soil improvement effect.

Description

technical field [0001] The invention relates to the field of agricultural technology, in particular to a polyaspartic acid complex and its preparation method and application. Background technique [0002] At present, my country's water resources are limited, and the amount of water used for agriculture continues to grow, coupled with the increasing pollution of water resources. Therefore, the rational development and utilization of water sources has become an important strategic issue in agricultural development planning. At present, my country's agricultural water consumption accounts for the total water consumption of the country. The effective utilization rate of water resources is low, and the development of water-saving agriculture is by no means an expedient measure, but a long-term major task. [0003] my country has a long history of pear cultivation and abundant resources. The cultivation area and output rank first in the world, accounting for more than 60% of the wo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/32C09K101/00
CPCC09K17/32C09K2101/00
Inventor 严春兰翟情情
Owner 辽宁东北丰专用肥有限公司
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