Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

New method for preparing polyaspartic acid hydrogels

A technology for polyaspartic acid and aspartic acid is applied in the field of preparing polyaspartic acid hydrogels, which can solve the problems of complicated process, pollute the environment, difficult recovery, etc. High capacity, avoid the effect of polluting the environment

Inactive Publication Date: 2010-10-20
BEIJING UNIV OF CHEM TECH
View PDF1 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In short, the shortcomings of the traditional process of preparing polyaspartic acid hydrogel are that due to the use of a large amount of organic solvents in the process, it is difficult to recover after the reaction, and it pollutes the environment; the process is complicated and the cost is relatively high.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • New method for preparing polyaspartic acid hydrogels
  • New method for preparing polyaspartic acid hydrogels
  • New method for preparing polyaspartic acid hydrogels

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add 1.000g of polysuccinimide with a number average molecular weight of 30,000 Daltons and 40ml of water to a 250ml beaker, and add 4.0ml of hexamethylenediamine and NaOH with a molar ratio of 1:9 at 25°C at a speed of 200rpm. Mixture. After 0.5 hour, 4.0 ml of hexamethylenediamine and NaOH in a molar ratio of 1:9 were added. After 0.5 hours, 1.7 ml of a mixture of hexamethylenediamine and NaOH with a molar ratio of 1:9 was added, and the concentration of the two solutions was 1 mol / L. The reaction stopped after 24 h of reaction.

[0038] The hydrogel after the reaction was put into a blast oven at 60° C. for 48 hours, and then taken out to obtain a white or light yellow solid, that is, a cross-linked PASP hydrogel. It is measured that the swelling ratio of the polyaspartic acid hydrogel in deionized water is 100 g / g, and the swelling ratio in 0.9 wt % NaCl aqueous solution is 20 g / g. According to electron microscope photos, it can be seen that the prepared hydrogel ...

Embodiment 2

[0040] What is different from Example 1 is that when preparing cross-linked polyaspartic acid, the molar ratio of hexamethylenediamine and NaOH mixed solution is 2:8, and the concentration of both solutions is 1mol / L; the mixed solution is divided into 4 times , added at intervals of 0.5 hours, adding 2.42ml each time. It is measured that the swelling ratio of the polyaspartic acid hydrogel in deionized water is 150 g / g, and the swelling ratio in 0.9 wt % NaCl. aqueous solution is 35 g / g. According to electron micrographs, it can be seen that the prepared polyaspartic acid hydrogel is a multi-level porous network structure with a certain density gradient, and the connection between network units at all levels is a multi-chain network connection, which is better than that of the polyaspartic acid hydrogel prepared in Example 1. The network structure of the amino acid hydrogel is denser and has better continuity. Therefore, its color is transparent, and its water absorption cap...

Embodiment 3

[0042] The difference from Example 1 is that when preparing cross-linked polyaspartic acid, the molar ratio of hexamethylenediamine and NaOH mixed solution is 3:7, and the concentration of both solutions is 1mol / L. The mixed solution was added in 2 times at intervals of 1 hour, and 4.9 ml was added each time. The reaction was completed in 72 hours. It is measured that the swelling ratio of the polyaspartic acid hydrogel in deionized water is 160 g / g, and the swelling ratio in 0.9 wt % NaCl. aqueous solution is 40 g / g. According to electron micrographs, it can be seen that the prepared polyaspartic acid hydrogel is a multi-level porous network structure with a certain density gradient, and the connection between network units at all levels is a multi-chain network connection, which is better than that of the polyaspartic acid hydrogel prepared in Example 1. The network structure of the amino acid hydrogel is denser and has better continuity. Therefore, its color is transparen...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
molecular weightaaaaaaaaaa
number average molecular weightaaaaaaaaaa
Login to View More

Abstract

The invention discloses a new method for preparing polyaspartic acid hydrogels, which comprises the following steps: preparing crosslinking and hydrolysis method-prepared crosslinked polyaspartic acid hydrogels by using polysuccinimide as a raw material and by using a heterogeneous suspension crosslinking method; and drying the crosslinked polyaspartic acid hydrogels to obtain solid polyaspartic acid hydrogel powder. In the step of preparing the crosslinking and hydrolysis method-prepared crosslinked polyaspartic acid hydrogels by using the heterogeneous suspension crosslinking method, a crosslinker and an alkaline mixture for hydrolysis are added into suspension of the polysuccinimide under a condition of the temperature of 10 below zero DEG C to 50 DEG C to perform crosslinking and hydrolysis at the time, and the reaction products are dried to obtain the polyaspartic acid hydrogels. The method has the advantages of simple preparation process, organic solvents are not used in the reaction processes, environment is protected, and the prepared polyaspartic acid hydrogels have high water absorption capacity and high anti-salt capacity. The invention belongs to the field of hydrogel preparation.

Description

technical field [0001] The invention relates to a new method for preparing polyaspartic acid hydrogel, in particular to a method for preparing polyaspartic acid hydrogel with polysuccinimide as raw material. Background technique [0002] Superabsorbent hydrogel is a lightly cross-linked polymer with strong hydrophilic groups that can absorb water dozens or even thousands of times its own weight. Polyaspartic acid water-absorbing hydrogel is a polymer obtained by cross-linking polyaspartic acid. It not only has good biodegradability and water absorption performance, but also has good biocompatibility. Even if it enters The human body can also be digested and absorbed through the action of enzymes, and it does not show antigenicity in the human body, and its metabolites are non-toxic. Polyaspartic acid water-absorbing hydrogel is a green functional polymer material with excellent performance. In addition to being used for health care products, medical treatment and food pack...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/02C08J3/075C08J3/09C08J3/24C08G73/10
Inventor 谭天伟薛茗元张睿李春玲
Owner BEIJING UNIV OF CHEM TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com