Polyaspartic acid type grafted copolymer and preparation method thereof

A technology of polyaspartic acid and graft copolymer is applied in the field of preparation of polyaspartic acid freezing point regulators, which can solve the problems of large consumption of ethylene glycol, unfavorable environmental protection, inability to repair, etc., and achieves low production cost, The effect of easy industrial production and high application value

Inactive Publication Date: 2015-05-27
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But usually all the water will not be condensed. The ice slurry is composed of tiny ice crystals and a solution, and the solution is usually composed of water and a freezing point regulator. The regulator for static cold storage is 25% ethylene glycol, and tiny ice crystals are produced in the solution. (about 100μm), but ethylene glycol is not conducive to environmental protection. For large-scale cold storage devices, all ice storage and melting need to go through coils. The amount of ethylene glycol is large. Once a leak occurs, it is almost impossible to repair and can only be replaced.

Method used

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  • Polyaspartic acid type grafted copolymer and preparation method thereof
  • Polyaspartic acid type grafted copolymer and preparation method thereof
  • Polyaspartic acid type grafted copolymer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] First, dissolve 1g of polysuccinimide in a reaction bottle of 10mL N,N-dimethylformamide. After it is completely dissolved, add polysuccinimide and ethanolamine to ethanolamine at a molar ratio of 1:1, seal it, and place it in an oil bath. Heat to 60°C, carry out ammonolysis with stirring for 48 hours, after the reaction is completed, add 0.4g / mL NaOH1mL according to the grafting ratio, a viscous fluid is precipitated at the bottom, discard the upper layer of reddish-brown liquid, dissolve the lower layer of fluid with water, and add HCl to adjust the pH When the value reaches neutral, dialyze for 3 days and freeze-dry for 24 hours to obtain a light yellow solid powder, which is PAsp / EA-1.0.

Embodiment 2

[0048] First, dissolve 1 g of polysuccinimide in a reaction bottle of 5 mL of N,N-dimethylformamide. After it is completely dissolved, add polysuccinimide and ethanolamine to ethanolamine at a molar ratio of 1:0.8, seal it, and place it in an oil bath. Heat to 60°C, carry out ammonolysis with stirring for 24 hours, after the reaction is completed, add 0.4g / mL NaOH 0.8mL according to the graft ratio, a viscous fluid precipitates at the bottom, discard the upper reddish-brown liquid, dissolve the lower fluid with water, add HCl Adjust the pH value to neutral, dialyze for 3 days, and freeze-dry for 24 hours to obtain a light yellow solid powder, namely PAsp / EA-0.8.

Embodiment 3

[0050] First, dissolve 1 g of polysuccinimide in a reaction bottle of 5 mL of N,N-dimethylformamide. After it is completely dissolved, add polysuccinimide and ethanolamine to ethanolamine at a molar ratio of 1:0.6, seal it, and place it in an oil bath. Heat to 60°C, carry out ammonolysis with stirring for 24 hours, after the reaction is completed, add 0.4g / mL NaOH 0.6mL according to the grafting ratio, a viscous fluid precipitates at the bottom, discard the upper reddish-brown liquid, dissolve the lower fluid with water, add HCl Adjust the pH value to neutral, dialyze for 3 days, and freeze-dry for 24 hours to obtain a light yellow solid powder, ie PAsp / EA-0.6.

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Abstract

The invention belongs to the technical field of high polymer materials and relates to a polyaspartic acid type ice point regulator preparation method by taking polyaspartic acid and polyaspartic acid derivatives as the raw materials. A macromolecular polyaspartic acid type grafted copolymer is provided, and is synthesized by a midbody polysuccinimide of polyaspartic acid amino acid and a graft, wherein the graft comprises alcohol amine type substances, such as ethanol amine, isopropanolamine, diglycolamine, diethanol amine, 2-amino-1-butanol, N-(3-aminopropyl)diethanol amine, 3-amino propanol, 2-(methylamino)ethanol, D-phenylglycinol, diisopropanol amine and N-(2-ethoxy)ethylenediamine. The copolymer can be taken as an environment-friendly macromolecular ice point regulator, and has high application value in the energy saving field of a dynamic ice-slurry cold-storage air-conditioning system and the field of food additives and medical fields.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a preparation method of a polyaspartic acid freezing point regulator prepared from polyaspartic acid and polyaspartic acid derivatives. Background technique [0002] Freezing is a double-edged sword. While it brings convenience to life, it also brings great harm and potential safety hazards to human beings and society. For frost resistance, nature provides some clues. In the north and south poles and near the poles, the seawater temperature in winter can be lower than -1.9°C, and most fish blood freezing point is -0.7°C, but they can survive in this supercooled environment. In 1969, DeVise et al. discovered a protein in the serum of Antarctic sea fish that inhibited the growth of ice crystals, called antifreeze protein, which can lower the freezing point without changing the melting point. Many organisms have an incomparable degree of cold resistance, and the cold resista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C09K5/20
Inventor 余定华黄和单飞王亚兵
Owner NANJING UNIV OF TECH
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