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A kind of pre-film composition and pre-film method

A composition and pre-film technology, which is applied in the coating process of metal materials, etc., can solve the problems of long pre-film time, unenvironmental friendliness, and high phosphorus content of pre-film agents

Active Publication Date: 2017-09-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, CN1193609A discloses a pre-film agent composed of biological enzyme purifying agent, biological inhibitor, inorganic salt complex agent and conventional water quality stabilizer monomer, which is characterized in that cleaning and pre-film are integrated, which simplifies the on-site operation; however, with this cleaning pre-filming agent, the pre-filming time is long, and it is still necessary to add orthophosphate in order to obtain the ideal pre-filming effect
CN1509996A discloses a pre-filming agent composed of phosphoric acid, zinc dihydrogen phosphate, organic phosphonic acid, etc., which can be used for pre-filming at a higher pH value for water quality with high hardness and high alkalinity; but the pre-filming agent of this invention The phosphorus content in the agent is high, and there are the same emission problems as the traditional pre-film agent
Although this invention has greatly reduced the total phosphorus content in water, it has not achieved real environmental friendliness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0021] According to a preferred embodiment of the present invention, the pre-film composition is composed of a cyclodextrin type corrosion inhibitor, a hydroxycarboxylate, a sulfonic acid group-containing copolymer, a water-soluble inorganic zinc salt and water. Through this preferred embodiment, the composition for pre-filming of the present invention can better achieve the purpose of pre-filming in an environment-friendly manner.

[0022] According to the present invention, the pre-film composition can be obtained by various existing methods, for example, the raw materials for forming the pre-film composition can be uniformly mixed according to the aforementioned ratio, and the mixing step and conditions without special requirements.

[0023] The present invention also provides a pre-filming method for a circulating cooling water system, the method comprising mixing the composition for pre-filming of the present invention with circulating cooling water in the circulating coo...

Embodiment 1

[0041] Weigh 8.0g of hydroxyethyl-β-cyclodextrin and 10.0g of sodium gluconate, add 29.4g of water; add 39.4g of acrylic acid and 2'-acrylamide-2-methylpropanesulfonic acid copolymer (solid content of 30.5% by weight, the limiting viscosity at 30°C is 0.075dL / g, and the weight ratio of acrylic acid to 2'-acrylamide-2-methylpropanesulfonic acid is 3:1); then add 13.2g of zinc sulfate heptahydrate, Stir and dissolve evenly to obtain 100 g of the pre-filming agent to be prepared. According to the use amount of 300mg / L test water to 2 # The above-mentioned pre-filming agent was added to the test water, and after pre-filming at a constant temperature of 30°C for 10 hours, the pre-filming effect was tested by the copper sulfate-sodium chloride solution method, and the time for red dots to appear was 175 seconds.

Embodiment 2

[0043] Weigh 6.0g hydroxypropyl-β-cyclodextrin and 8.0g potassium gluconate, add 49.2g water; add 32.6g copolymerization of acrylic acid, hydroxypropyl acrylate and 2'-acrylamide-2-methylpropanesulfonic acid (the solid content is 30.7% by weight, the limiting viscosity at 30°C is 0.081dL / g, and the weight ratio of acrylic acid, hydroxypropyl acrylate and 2'-acrylamide-2-methylpropanesulfonic acid is 3:1: 1); then add 4.2g of zinc chloride, stir and dissolve evenly, and then get 100g of pre-filming agent to be prepared. According to the use amount of 400mg / L test water to 1 # The above-mentioned pre-filming agent was added to the test water, and after pre-filming at a constant temperature of 30 ° C for 12 hours, the pre-filming effect was tested by the copper sulfate-sodium chloride solution method, and the time for red dots to appear was 193 seconds.

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Abstract

The invention discloses a pre-membrane composition and a pre-membrane method. The pre-membrane composition contains a cyclodextrin type corrosion inhibitor, a hydroxy carboxylate, a water-soluble inorganic zinc salt and a sulfonic acid group-containing Copolymer, the weight ratio of described cyclodextrin type corrosion inhibitor, hydroxycarboxylate, sulfonic acid group copolymer and water-soluble inorganic zinc salt is (1-5):(1-7.5):(0-5 ): 1, preferably (1-4): (1.5-6): (0-5): 1, wherein the weight of the water-soluble inorganic zinc salt is based on zinc ions. The pre-filming method of the circulating cooling water system provided by the present invention comprises mixing the above-mentioned pre-filming composition or pre-filming agent with the circulating cooling water in the circulating cooling water system. Through the above technical solution, the pre-filming agent of the present invention does not contain phosphorus, is environmentally friendly, and has a better pre-filming effect.

Description

technical field [0001] The present invention relates to a pre-film composition and a pre-film method, in particular, to a pre-film composition and a pre-film method of a circulating cooling water system using the pre-film composition. Background technique [0002] Before running the circulating cooling water system, the system should be cleaned and pre-filmed. The so-called pre-film refers to the process of adding a pre-film agent to the system to form a protective film with corrosion resistance on the cleaned metal surface through physical and chemical action. At present, the pre-filming agent widely used in China is the compound formula of polyphosphate and zinc salt. Although the pre-filming effect is good, the dosage of chemicals is large, and the phosphorus and zinc content in the wastewater after pre-filming is high, which has potential pollution risks to the environmental water body. [0003] In recent years, domestic scholars have carried out some research on pre-f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/12C23C22/68
Inventor 王岽吴颖郦和生魏新冯婕
Owner CHINA PETROLEUM & CHEM CORP
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