Water-soluble polyamide, and preparation method and application thereof

Abstract

The invention discloses a water-soluble polyamide, and a preparation method and an application thereof, and belongs to technical field of the synthetic methods of the polymers and applications thereof. The preparation method comprises the steps of mixing tributyl citrate and diethyl succinate according to the proportion of 1:2-3:1 and an equal amount to the total amount of the above substances; vacuum-heating the above mixture for 60 h at a temperature of 60 DEG C to obtain a prepolymer; heating the prepolymer to a temperature of 160 DEG C; reacting for 4 h; then heating the prepolymer to a temperature of 200 DEG C; heating continuously for 4 h to obtain a polymer; and hydrolyzing the polymer under a strong alkali condition to obtain the water-soluble polyamide. The preparation method is simple and has easily obtained raw materials. The polymerized product has the characteristic of good water-solubility, and can chelate metal ions in a water solution.

Description

technical field [0001] The invention relates to a polymer synthesis method and its application, in particular to a water-soluble polyamide synthesis method and its application in metal ion adsorption. technical background [0002] The conventional preparation methods of water-soluble polyamide mainly include: (1) amino acid is used as raw material to generate polypeptide through polymerization reaction; (2) some bacteria can produce and synthesize polyamino acid by themselves; (3) dicarboxylic acid (or carboxylic acid derivative , such as esters, acid chlorides or acid anhydrides) and short-chain diamines may be reacted and polymerized to obtain water-soluble polyamides. For example, Chinese patent 200410026949.5 proposes that maleic anhydride and ethylenediamine can be used as raw materials; (4) in aromatic The benzene ring of the polyamide of the family is connected with a highly hydrophilic sulfonic acid group to achieve water solubility. For example, Chinese patent 20111...

AI Technical Summary

Problems solved by technology

PASP is a water-soluble polyamide with superior performance, non-toxic, non-polluting, and easy to degrade. It can be used as a chelating agent, scale inhibitor, drug carrier, and superabsorbent material [Langmuir, 2003, 19 (14), 5669-5679;Materials and Corrosion,2011,62(4),362-369;Biomacromolecules,2012,13(5),1307-1314;EnvironmentalPollution,2007,150(3),381-384]; but the shortcomings Be that, in the prior art, the synthetic method of polyaspartic acid (PASP) is more complicated, and technique is difficult to control, thereby is difficult to realize mass production; Simultaneously, the production cost in the synthesis process is higher; Limited, and at the same time, there is no selectivity, so the ideal treatment effect cannot be obtained in the process of water treatment, especially in the treatment of sewage containing heavy metals

[0009] Although these heavy metal chelating agents have strong chelating ability, they also face problems such as complex synthesis process and difficult preparation, and cannot achieve better economic benefits.

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