Process for preparing super strength water absorbent from polyglutamic acid prepared by microbe fermentation and synthesis

Abstract

The invention relates to the utilization of particle radiation to process the high molecular substance, especially for using the polyglutamic acid fermentation synthesized from microbe to prepare the absorbent agent. The operation steps comprises: preparing the water solution of polyglutamic acid fermentation synthesized from microbe in the percentage by weight of 1-10 %; utilizing the cobalt 60Co as the gamma radiation source to radiate on the solution prepared in the first step in the condition of nitrogen protection while the radiation dose rate is 0.5 kGy / hour-5.0kGy / hour and the tatl radiation dose is 2-150 kGy; The radiated gel will fully swell in 2-8 Deg. C for 4-8 days while the water as the swell-medium should be replaced one time one day to remove the un-crosslinking monomers and the impurities in the gel; and freezing and drying the gel in common vacuum drier until constant weight to attain the absorbent agent. Said invention has simple manufacturing process without environment pollution, stable property and higher water absorption ratio.

Description

technical field [0001] The technical scheme of the present invention relates to the treatment of macromolecular substances with particle radiation, specifically a method for preparing a super water-absorbing agent by treating polyglutamic acid synthesized by microbial fermentation with γ-ray radiation. Background technique [0002] γ-Polyglutamic acid (γ-PGA) is an extracellular viscous substance synthesized by microbial fermentation, which is formed by glutamic acid monomers bound by γ-peptide bonds. It is biodegradable, soluble in water, edible, non-toxic, has good biocompatibility, and is widely used in medicine, textile, food, cosmetics, environment, agriculture and other fields. [0003] Hydrogels are a class of substances that can absorb a large amount of water but cannot dissolve in water. Hydrophilic small molecules are able to diffuse in the hydrogel. Hydrogels have good biocompatibility. Compared with hydrophobic polymers, they have much weaker interactions with ...

AI Technical Summary

Problems solved by technology

The chemical cross-linking method has complex operation methods, many reaction steps, long action time, high action temperature, low product yield and poor biocompatibility, generally low water absorption of the gel, and the use of a large number of chemical cross-linking agents causes environmental pollution

Choi and Kunioka (Radia.Phys.Chem.1995, 46 (2): 175-179) introduced a physical cross-linking method for preparing superabsorbent polyglutamic acid hydrogel, but the water absorption of the product obtained The highest is only 1400, and the texture is brittle

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