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Non-phosphorus scale and corrosion inhibitor and preparation method thereof

A scale and corrosion inhibitor, non-phosphorus technology, applied in chemical instruments and methods, descaling and water softening, special treatment goals, etc., can solve the problems of poor biodegradability, poor scale inhibition performance, Narrow range and other issues, to achieve the effect of inhibiting the electrochemical reaction of the cathode, strong selectivity, and expanding the scope of application

Pending Publication Date: 2020-08-14
AQUA WORTH SUZHOU ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above technical problems, the object of the present invention is to provide a green and environment-friendly non-phosphorus scale and corrosion inhibitor, which can 1) solve the problem of poor performance of scale and corrosion inhibitors on special scale systems; 2) solve the problem of scale and corrosion inhibitors Corrosion inhibitors inhibit single metals, and the scope of application is narrow; 3) Solve the problems of poor biodegradability of scale and corrosion inhibitors, long-term use of polluted water bodies, and impact on ecology

Method used

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  • Non-phosphorus scale and corrosion inhibitor and preparation method thereof
  • Non-phosphorus scale and corrosion inhibitor and preparation method thereof
  • Non-phosphorus scale and corrosion inhibitor and preparation method thereof

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preparation example Construction

[0040] Such as figure 1 Shown, the present invention also provides a kind of preparation method of non-phosphorus scale and corrosion inhibitor, comprises the following steps:

[0041] 1) Weigh the raw materials according to the ratio;

[0042] 2) first mix the modified lignosulfonate and the modified polyaspartic acid, and add it to water;

[0043] 3) adding polymaleic anhydride-2-acrylamido-2-methylpropanesulfonic acid into the solution obtained in 2);

[0044] 4) adding sodium molybdate to 3) the resulting solution;

[0045] 5) adding sodium gluconate into the solution obtained in 4) to obtain the non-phosphorus scale and corrosion inhibitor.

[0046] The present invention achieves the following technical effects: 1) solves the problem of poor scale inhibition performance of special scale systems by scale and corrosion inhibitors; in addition to conventional calcium carbonate scale inhibition, it can also be specifically adapted to calcium phosphate and calcium sulfate s...

Embodiment 1

[0048] Using purified water as a solvent, prepare a non-phosphorus scale and corrosion inhibitor (NP scale and corrosion inhibitor), the non-phosphorus scale and corrosion inhibitor system includes modified lignosulfonate 10mg / L, polyaspartic acid Acid-adenine graft copolymer 5mg / L, polymaleic anhydride-2-acrylamido-2-methylpropanesulfonic acid 3mg / L, sodium molybdate 3mg / L, sodium gluconate 14mg / L. The non-phosphorus scale and corrosion inhibitors were subjected to static scale inhibition evaluation and coupon corrosion experiments. The results showed that the scale inhibition rate of calcium carbonate was 95%, the scale inhibition rate of calcium sulfate was 90%, and the scale inhibition rate of calcium phosphate was 78%. The corrosion inhibition rate is 79% for brass, 85% for brass, and 53% for aluminum.

Embodiment 2

[0050] Using purified water as a solvent, prepare a non-phosphorus scale and corrosion inhibitor (NP scale and corrosion inhibitor), the non-phosphorus scale and corrosion inhibitor system includes modified lignosulfonate 10mg / L, polyaspartic acid Acid-p-hydroxyphenylethylamine copolymer 5mg / L, polymaleic anhydride-2-acrylamido-2-methylpropanesulfonic acid 3mg / L, sodium molybdate 2mg / L, sodium gluconate 14mg / L, obtained Non-phosphorus (NP) scale and corrosion inhibitor. The NP scale and corrosion inhibitor was subjected to static scale inhibition evaluation and coupon corrosion test. The results showed that the scale inhibition rate of calcium carbonate was 90%, the scale inhibition rate of calcium sulfate was 97%, and the scale inhibition rate of calcium phosphate was 80%. The corrosion inhibition rate is 87%, the corrosion inhibition rate for brass is 72%, and the corrosion inhibition rate for aluminum is 54%.

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Abstract

The invention discloses an environment-friendly non-phosphorus scale and corrosion inhibitor. The environment-friendly non-phosphorus scale and corrosion inhibitor is prepared from the following components: modified lignosulfonate, a polyaspartic acid modifier, polymaleic anhydride-2-acrylamide-2-methylpropanesulfonic acid, sodium molybdate, sodium gluconate and water in a mass ratio of 1 to (0.45to 0.75) to (0.25 to 0.55) to (0.2 to 0.8) to (1.3 to 1.8) to 100. The scale and corrosion inhibitor is excellent in scale inhibition performance on calcium carbonate, calcium sulfate and calcium phosphate, excellent in corrosion inhibition performance on different metals and wide in application range, and the main components of the scale and corrosion inhibitor are biodegradable, environmentallyfriendly and wide in market prospect.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a non-phosphorous scale and corrosion inhibitor and a preparation method thereof. Background technique [0002] In the field of industrial circulating water, non-environmentally friendly phosphorus-based scale and corrosion inhibitors are widely used. This kind of agent is non-toxic to the water itself, cheap and has very good scale and corrosion inhibition performance, and it will be widely used at present and in a certain period in the future. However, after such chemicals are discharged into the water body, it is easy to cause eutrophication of the water body and seriously pollute the water body. At the same time, due to the country's higher and higher requirements for environmental protection, more and more attention has been paid to the development of environmentally friendly non-phosphorus scale and corrosion inhibitors. [0003] Patent "A Phosphorus-free Scale and Corrosio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12
CPCC02F5/125C02F2303/22C02F2303/08C23F11/08
Inventor 李升军吴晓雄楚飞虎
Owner AQUA WORTH SUZHOU ENVIRONMENTAL PROTECTION
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