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Synthetic method and applications of modified polyaspartic acid with Schiff base structure

A technology of polyaspartic acid and synthesis method, which is applied in the field of modified polyaspartic acid corrosion inhibitors, can solve the problems of poor corrosion inhibition performance and no published modified polyaspartic acid corrosion inhibitors, etc. To achieve the effect of protection from corrosion

Active Publication Date: 2018-08-07
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although polyaspartic acid exhibits poor corrosion inhibition performance, its application and modification are still worthy of further exploration due to its typical non-toxic and biodegradable properties
More work on the modification of polyaspartic acid involves the improvement of scale inhibition performance, and no previous studies have published modified polyaspartic acid as a corrosion inhibitor in acidic solutions

Method used

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  • Synthetic method and applications of modified polyaspartic acid with Schiff base structure
  • Synthetic method and applications of modified polyaspartic acid with Schiff base structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] First, maleic anhydride and ammonia are used for thermal condensation reaction to produce polysuccinimide. Polysuccinimide is ring-opened by thiocarbazide amino under NaOH alkaline conditions to obtain an intermediate product, and then the intermediate product and p-chlorobenzaldehyde Aldamine condensation reaction, glacial acetic acid as a catalyst, water phase reaction.

[0022] Synthesis of modified polyaspartic acid with Schiff base structure

[0023] 9.802g (0.1moL) maleic anhydride was dissolved in a 250mL three-necked flask filled with 10ml of distilled water and placed in a 70°C water bath with heating and stirring for 10min.

[0024] Take 9mL of ammonia water (0.1moL) into the funnel, slowly add it to the above three-necked flask within 2min, after the dripping is completed, raise the temperature to 75℃, react at a constant temperature for 1h, then pass argon into the flask as a protective gas, and the oil bath heats up When the temperature reaches 180°C, the polymer...

Embodiment 2

[0038] The other steps are the same as in Example 1. The difference is that the thermal polycondensation reaction of maleic anhydride and ammonia water produces polysuccinimide. The polymerization time is 40 minutes. The performance test results are shown in Table 2.

[0039] Table 2

[0040] PASP / SB concentration (mg / L)

[0041] Example 2 is the effect of the polymerization time of polysuccinimide on the corrosion inhibition performance of modified polyaspartic acid with Schiff base structure.

Embodiment 3

[0043] The other steps are the same as in Example 1, except that 1g PSI and 1.5g thiocarbazide are dissolved in a 100mL single-neck flask filled with 30mL distilled water. The performance test results are shown in Table 3

[0044] table 3

[0045] PASP / SB concentration (mg / L)

[0046] Example 3 is the effect of the grafting rate of the intermediate product PASP-CD on the corrosion inhibition performance of modified polyaspartic acid with a Schiff base structure.

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Abstract

The invention discloses a synthetic method and applications of a modified polyaspartic acid with a Schiff base structure. The synthetic method comprises following steps: cis-butenedioic anhydride is introduced into a reactor containing distilled water, and is subjected to water bath stirring at 30 to 60 DEG C; ammonia water is introduced into the reactor drop by drop, and reaction is carried out for 0.5 to 3h at 60 to 100 DEG C; at argon atmosphere, oil bath treatment is adopted to increase the temperature to 180 to 240 DEG C, reaction is carried out for 20 to 40min, N, N-dimethyl formamide isadded for dissolving of a sticky substance, and product PSI is obtained via reaction; PSI and thiocarbazide are dissolved in a reactor containing distilled water, heating stirring is carried out for6 to 12h so as to obtain product PASP / CD; and at last the obtained PASP / CD aqueous solution and an alcoholic solution of p-chlorobenzaldehyde are subjected to heating backflow so as to obtain the modified polyaspartic acid with a Schiff base structure. The main chain of the modified polyaspartic acid corrosion inhibitor with a Schiff base structure is a biodegradable polymer, and the corrosion inhibition efficiency is 90% or higher.

Description

Technical field [0001] The invention relates to the field of metal corrosion prevention in solution media, in particular to the preparation of a novel modified polyaspartic acid corrosion inhibitor with a Schiff base structure and its corrosion inhibition effect on metals in acid solutions. Background technique [0002] Acidic solutions are widely used in various industrial practices, such as acid descaling, pickling and oil well acidification. Carbon steel is a low-cost, high-strength metal material that has been widely used in transportation pipelines, storage tanks and other factory equipment. Therefore, the corrosion of carbon steel becomes an inevitable problem in the acid treatment process. Corrosion will shorten the life of equipment, causing economic problems and safety hazards. Metal corrosion is extremely harmful. Corrosion inhibitor is a chemical substance or compound substance that exists in the environmental medium in an appropriate concentration and form to preven...

Claims

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Application Information

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IPC IPC(8): C08G73/10C23F11/04
CPCC08G73/1092C08G2230/00C23F11/04
Inventor 陈建新王彩韩健
Owner HEBEI UNIV OF TECH
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