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Preparation method of epoxysuccinic acid-sodium 2-(hydroxyimino) malonate copolymer

A technology of epoxy succinic acid and hydroxyimino, which is applied in the field of fine chemicals and can solve problems such as single performance and single functional group

Pending Publication Date: 2021-03-23
SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of single functional group and single performance of polyepoxysuccinic acid in the prior art, the present invention provides a preparation method of epoxysuccinic acid-2-(hydroxyimino)sodium malonate copolymer

Method used

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  • Preparation method of epoxysuccinic acid-sodium 2-(hydroxyimino) malonate copolymer
  • Preparation method of epoxysuccinic acid-sodium 2-(hydroxyimino) malonate copolymer

Examples

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Effect test

Embodiment 1

[0022] Step 1: Mix 16g of dimethyl 2-(hydroxyimino)malonate, 132g of epoxysuccinic acid and 40g of sodium hydroxide to obtain a monomer mixture, and transfer it to a solid feeding device that has replaced the air with nitrogen.

[0023] Step 2: Add 186g of ethylene glycol and 4g of potassium hydroxide to the reaction kettle, stir and heat up to 112±2°C for 1h, cool down to 75±5°C, distill water at -0.1MPa for 1.2h, then turn off the negative pressure, Add 19g of 18-crown-6, and replace the air in the system with nitrogen for 20 minutes.

[0024] Step 3: Turn on the stirring, continue to heat up the temperature in the reactor to 102±2°C, add 5g of monomer mixture at an interval of 5min, and finish adding after 3.1h, continue to keep warm for 7h, add 50g of water, and add the mass fraction dropwise 20% sodium hydroxide is hydrolyzed, and the pH of the system is adjusted to 10~12 by the rate of sodium hydroxide addition. After hydrolysis for 2 hours, it is filtered, and the filtr...

Embodiment 2

[0027] Step 1: Mix 32g of dimethyl 2-(hydroxyimino)malonate, 132g of epoxysuccinic acid and 60g of sodium hydroxide to obtain a monomer mixture, and transfer it to a solid feeding device that has replaced the air with nitrogen.

[0028] Step 2: Add 310g of ethylene glycol and 6.6g of potassium hydroxide to the reactor, stir and heat up to 118±2°C for 1h, then cool down to 75±5°C, distill water at -0.08MPa for 1.2h, then turn off the negative pressure , add 31g of 18-crown-6, replace the air in the system with nitrogen for 20min.

[0029] Step 3: Turn on the stirring, continue to heat up the temperature in the reactor to 108±2°C, add 5g of monomer mixture at an interval of 5 minutes, and complete the injection after 3.7 hours. After continuing to keep warm for 9 hours, add 50g of water and drop the mass fraction Hydrolyze with 20% sodium hydroxide, adjust the pH of the system at 10~12 by the rate of sodium hydroxide addition, filter after hydrolysis for 2 hours, distill out eth...

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Abstract

The invention discloses a preparation method of an epoxysuccinic acid-sodium 2-(hydroxyimino) malonate copolymer, belonging to the technical field of fine chemicals. According to the invention, epoxysuccinic acid and dimethyl-2-(hydroxyimino)malonate are used as monomers and are subjected to anionic polymerization to generate the copolymer. The copolymer does not contain sulfur and phosphorus, hasbiodegradability and is green and environment-friendly; and the content of carboxyl groups in unit mass of the epoxysuccinic acid-sodium 2-(hydroxyimino) malonate polymer is increased, and hydroxyl groups are introduced, so the unit content of an adsorption center is increased, and the scale and corrosion inhibition performance of the polymer is effectively improved under the synergistic effect of different groups.

Description

technical field [0001] The patent of the invention relates to the technical field of fine chemicals, in particular to a preparation method of epoxysuccinic acid-2-(hydroxyimino)sodium malonate copolymer. Background technique [0002] Polyepoxysuccinic acid is a green water treatment agent with dual functions of corrosion inhibition and scale inhibition. Due to its phosphorus-free and non-nitrogen structure characteristics, it will not cause eutrophication of water bodies and can be degraded by natural microorganisms. An environmentally friendly multi-component scale and corrosion inhibitor and non-phosphorus complexing agent in detergents with wide application prospects. [0003] As a scale inhibitor, polyepoxysuccinic acid will not fail due to the formation of scale inhibitor-calcium compounds like traditional scale inhibitors under the conditions of high hardness, high alkalinity and high pH. When polyepoxysuccinic acid is used as a scale inhibitor in water treatment, it ...

Claims

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Application Information

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IPC IPC(8): C08G65/28
CPCC08G65/2609C08G65/2624C08G65/2648
Inventor 程终发周响
Owner SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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