A kind of synthetic method and application of modified polyaspartic acid with Schiff base structure

A polyaspartic acid and synthesis method technology, applied in the field of modified polyaspartic acid corrosion inhibitors, can solve the problems of unpublished modified polyaspartic acid corrosion inhibitors, poor corrosion inhibition performance, etc.

Active Publication Date: 2020-04-14
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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  • A kind of synthetic method and application of modified polyaspartic acid with Schiff base structure
  • A kind of synthetic method and application of modified polyaspartic acid with Schiff base structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Firstly, polysuccinimide is generated by thermal polycondensation reaction of maleic anhydride and ammonia water, and polysuccinimide is subjected to ring-opening reaction of thiocarbazide amino group under NaOH alkaline conditions to obtain an intermediate product, and then the intermediate product is reacted with p-chlorobenzaldehyde Aldehyde-amine condensation reaction, glacial acetic acid as catalyst, water phase reaction.

[0022] Synthesis of Modified Polyaspartic Acid with Schiff Base Structure

[0023] Dissolve 9.802g (0.1moL) of maleic anhydride in a 250mL three-necked flask filled with 10ml of distilled water, and heat and stir in a 70°C water bath for 10min.

[0024] Take 9mL of ammonia water (0.1moL) in the funnel, and slowly add it into the above-mentioned three-neck flask within 2min. After the dropwise addition, raise the temperature to 75°C and react at a constant temperature for 1h. To 180°C, polymerize for 30 minutes, stop heating, and naturally cool ...

Embodiment 2

[0038] The other steps are the same as in Example 1, except that the polymerization time of maleic anhydride and ammonia water to generate polysuccinimide is 40 minutes, and the performance test results are shown in Table 2

[0039] Table 2

[0040] PASP / SB concentration (mg / L) Mass loss (g) Corrosion inhibition rate η(%) 0 0.2285 _ 10 0.0723 68.4 20 0.0604 73.6 40 0.0399 82.5 80 0.0221 90.3

[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] Other steps are the same as in Example 1, except that 1gPSI and 1.5g of thiocarbazide are dissolved in a 100mL single-necked flask with 30mL of distilled water, and the performance test results are shown in Table 3

[0044] table 3

[0045] PASP / SB concentration (mg / L) Mass loss (g) Corrosion inhibition rate η(%) 0 0.2285 _ 10 0.0687 69.9 20 0.0581 74.6 40 0.0398 82.6 80 0.0203 91.1

[0046] Example 3 is the effect of the grafting ratio of the intermediate product PASP-CD on the corrosion inhibition performance of the modified polyaspartic acid with 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 anticorrosion of metals in solution media, in particular to the preparation of a novel modified polyaspartic acid corrosion inhibitor with a Schiff base structure and its anticorrosion effect on metals in acidic solutions. Background technique [0002] Acidic solutions are widely used in various industrial practices such as acid descaling, pickling and oil well acidizing. Carbon steel is a low-cost, high-strength metal material that has been widely used in conveying pipelines, storage tanks and other factory equipment. Therefore, corrosion of carbon steel becomes an inevitable problem during acid treatment. Corrosion can shorten equipment life, cause economic problems and safety hazards. Metal corrosion is extremely harmful. A corrosion inhibitor is a chemical substance or compound substance that exists in the environmental medium in an appropriate concentration and form to prevent or slow down metal corrosion. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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