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Non-phosphorus environment-friendly pretreatment filming agent for circulating water

A technology of pre-filming agent and circulating water, applied in the direction of metal material coating process, etc., can solve the problems of environmental damage, unfavorable environmental protection, large consumption, etc., to improve corrosion resistance, save pre-filming costs, and reduce pre-filming costs Effect

Inactive Publication Date: 2017-01-04
WEIHAI XIANGYU TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional industrial circulating water is precoated with inorganic phosphorus and zinc chemicals, including sodium hexametaphosphate and zinc sulfate heptahydrate (15:4), and sodium tripolyphosphate and zinc sulfate heptahydrate (3:1), with an amount of 400- 800mg / L, the pre-coating pH value is 6.5-7.2, and the pre-coating time is 36-48 hours. The traditional pre-filming agent has harsh operating conditions and is not conducive to environmental protection: (1) The traditional pre-filming agent is not suitable for dosing. Calcium phosphate scale is formed; (2) A large amount of sulfuric acid is consumed in the pre-film process to adjust the pH value, and the pH value is not easy to stabilize; (3) The circulating water after the pre-film process contains high concentrations of phosphorus, and direct sewage will cause damage to the environment. Wastewater treatment higher cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Select raw materials by weight percentage

[0018] Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer 20%

[0019] Hydrolyzed Polymaleic Anhydride 15%

[0020] Sodium Gluconate 10%

[0021] Zinc sulfate 5%

[0022] Concentrated sulfuric acid 1%

[0023] The rest is deionized water, and its total weight satisfies 100%.

[0024] Add the above-mentioned non-phosphorus environmental protection pre-filming agent directly into the experimental water to carry out the rotary hanging test. The dosage concentration is 450mg / L, the test temperature is 45°C, and the test time is 48h. The water quality of the test water is: calcium hardness (calculated as CaCO3) 150mg / L, total alkalinity (calculated as CaCO3) 100mg / L, pH is 6.5, and experimental result is shown in Table 1.

Embodiment 2

[0026] Select raw materials by weight percentage

[0027] Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer 18%

[0028] Hydrolyzed Polymaleic Anhydride 14%

[0029] Sodium Gluconate 8%

[0030] Zinc sulfate 5%

[0031] Concentrated sulfuric acid 1%

[0032] The rest is deionized water, and its total weight satisfies 100%.

[0033] Add the above-mentioned non-phosphorus environmental protection pre-filming agent directly into the experimental water to carry out the rotary hanging test. The dosage concentration is 450mg / L, the test temperature is 45°C, and the test time is 48h. The water quality of the test water is: calcium hardness (calculated as CaCO3) 150mg / L, total alkalinity (calculated as CaCO3) 100mg / L, pH is 6.5, and experimental result is shown in Table 1.

Embodiment 3

[0035] Select raw materials by weight percentage

[0036] Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer 22%

[0037] Hydrolyzed Polymaleic Anhydride 18%

[0038] Sodium Gluconate 10%

[0039] Zinc sulfate 8%

[0040] Concentrated sulfuric acid 1.5%

[0041] The rest is deionized water, and its total weight satisfies 100%.

[0042] Add the above-mentioned non-phosphorus environmental protection pre-filming agent directly into the experimental water to carry out the rotary hanging test. The dosage concentration is 450mg / L, the test temperature is 45°C, and the test time is 48h. The water quality of the test water is: calcium hardness (calculated as CaCO3) 150mg / L, total alkalinity (calculated as CaCO3) 100mg / L, pH is 6.5, and experimental result is shown in Table 1.

[0043] The experimental result of embodiment 1-3

[0044] Example Drug dosage mg / L Saturated copper sulfate color development time (s) Example 1 450 81 Example 2 4...

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PUM

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Abstract

The invention aims to provide a non-phosphorus environment-friendly pretreatment filming agent for circulating water. The non-phosphorus environment-friendly pretreatment filming agent for the circulating water has the advantages that good filming effects are achieved, and compact protection films can be formed on the surfaces of pipelines and a heat exchanger in advance so as to protect equipment and prolong the service life thereof; the pretreatment filming agent is simple in component, available to raw materials, low in cost and free of toxicity and secondary environmental pollution; the pretreatment filming agent is high in filming speed, compact and even in formed film and capable of improving corrosion resistance of the pipelines effectively.

Description

technical field [0001] The invention belongs to the special agent for circulating water, in particular to a phosphorus-free and environment-friendly pre-film agent for circulating water. Background technique [0002] Prefilming agent is one of the essential and important links in the pretreatment process of industrial water treatment. It is a film-forming chemical that can preform a dense protective film on the surface of pipes and heat exchangers. The pre-film agent can pre-form a complete and dense corrosion-resistant protective film on the metal surface of the new system equipment, or on the metal surface in an activated state after chemical cleaning, especially after pickling, before the circulating water system is started up. It is an important means to improve the corrosion resistance of the circulating water system. [0003] Traditional industrial circulating water is precoated with inorganic phosphorus and zinc chemicals, including sodium hexametaphosphate and zinc ...

Claims

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Application Information

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IPC IPC(8): C23C22/48C23C22/50
CPCC23C22/48C23C22/50
Inventor 陈维忠李洪社喻果
Owner WEIHAI XIANGYU TECH
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