Method for preparing poly-aspartic-acid resin

A polyaspartic acid and resin technology, which is applied in the field of preparing polyaspartic acid resin, can solve the problems of inability to balance water absorption performance and gel strength, and achieves good gel strength, large pore size and porosity, and water absorption speed. quick effect

Active Publication Date: 2006-08-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in view of the problem that the water absorption performance and gel strength of polyaspartic acid resin products cannot be balanced, it is necessary to improve the traditional preparation process and develop the preparation of polyaspartic acid resin with excellent water absorption performance and gel strength process, improve product quality and economy

Method used

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  • Method for preparing poly-aspartic-acid resin
  • Method for preparing poly-aspartic-acid resin
  • Method for preparing poly-aspartic-acid resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In a 500ml beaker, add 3g of polysuccinimide with a molecular weight of 500,000 Daltons and 108ml of N, N-dimethylformamide (the volumetric mass of N, N-dimethylformamide and polysuccinimide ratio of 36ml / g), dissolved at 25°C for 10 days, added 18ml of water at 40°C as a dispersant (volume mass ratio of water to polysuccinimide was 6ml / g), stirred (stirring speed 1000 rpm / min) 10 minutes to make a uniform suspoemulsion, add 0.24g of hexamethylenediamine as a crosslinking agent (the mass ratio of the total amount of hexamethylenediamine to polysuccinimide is 0.08g / g), hexamethylenediamine is divided into 2 Second addition: first add 0.12g, stir for 0.5 hour, then add 0.12g, continue stirring for 0.5 hour. Add 300ml of ethanol precipitant, wait for the precipitation to form and age for crystallization for 6 days, remove the supernatant by decantation, and dry the precipitation at 40° C. to obtain 3.18 g of solid cross-linked polysuccinimide.

[0052] 3.18g of cross-lin...

Embodiment 2

[0055] The difference from Example 1 is that when preparing cross-linked polysuccinimide, the cross-linking agent hexamethylenediamine was added in 4 times, and after the reactant formed a uniform suspoemulsion, within 1 hour, it was added every 15 minutes 0.06g hexamethylenediamine, all the other conditions are identical with embodiment 1. 3.10 g of solid polyaspartic acid resin were obtained. It is measured that the swelling ratio of the polyaspartic acid resin in deionized water is 1010 g / g, the swelling ratio in 0.9 wt % NaCl aqueous solution is 146 g / g, and the gel strength is 26.87 seconds. According to electron micrographs, it can be seen that the prepared polyaspartic acid resin 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 resin prepared in Example 1. The network structure of the resin is denser an...

Embodiment 3

[0057] In the beaker of 500ml, add 3g molecular weight and be the polysuccinimide of 300000 Daltons and 72mlN, N-dimethylformamide (the volume mass ratio of N, N-dimethylformamide and polysuccinimide is 24ml / g), dissolved at 40°C for 3 days, added 30ml of water as a dispersant at 60°C (the volume to mass ratio of water to polysuccinimide was 10ml / g), stirred (stirring speed 1000 rpm ) in 10 minutes to make a uniform suspoemulsion, add 0.15g of hexamethylenediamine as a crosslinking agent at 60°C (the mass ratio of the total amount of hexamethylenediamine to polysuccinimide is 0.05g / g), and the hexamethylenediamine 2 additions: first add 0.075g, stir for 1 hour, then add 0.075g, continue stirring for 1 hour. Add 300ml of ethanol precipitant, after the precipitate is formed, age and crystallize for 10 days, remove the supernatant by decantation, and dry the precipitate under vacuum at 40°C and 0.095MPa to obtain 3.02g of solid cross-linked polyamber imide.

[0058] 3.02g of cr...

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Abstract

This invention relates to a preparation method for poly-asparagic acid resin, which takes poly-pyrrolidine dione as the raw material to make crosslink poly-pyrrolidine dione with method of non-even phase suspended emulsion crosslink or non-even phase suspension crosslink and processes poly-asparagic acid resin by hydrolyzation characterizing that the crosslink poly-pyrrolidine dione is prepared by multi-section crosslink reaction, in which, the crosslinker is fed in for 2-4 times in equal volume and equal time interval, the crosslink poly-pyrrolidine dione and the resin are aged and crystallized and quickly dried, A ageing and crystallization process for 1-10 days under room temperature, B, quick drying process is carried out under -54-40deg.C.

Description

technical field [0001] The invention relates to a method for preparing polyaspartic acid resin by using high-molecular-weight polysuccinimide as a raw material and adopting a heterogeneous suspension crosslinking method or a heterogeneous suspension emulsion crosslinking method. Background technique [0002] Superabsorbent resin 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 superabsorbent resin 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 superabsorbent resin is a green functional polymer material with excellent performance. In addition to being u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/48C08G73/10C08J3/24
Inventor 谭天伟方莉杨俊曹辉
Owner BEIJING UNIV OF CHEM TECH
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