Precoating agent

A technology of pre-filming agent and sodium hexametaphosphate, which is applied in the coating process of metal materials, can solve the problems of pre-filming conditions (severe temperature, large amount of pre-filming agent, etc.), so as to reduce the amount of use and increase the range of use Effect

Inactive Publication Date: 2006-01-04
SHANGHAI WANSEN WATER TREATMENT CO LTD
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AI Technical Summary

Problems solved by technology

Its advantage is that the pre-filming time is short and the effect is good; the disadvantage is that the pre-filming conditions (temperature, pH value, calcium ion concentration, etc.) are relatively harsh, and the amount of pre-filming agent is large

Method used

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Examples

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Comparison scheme
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Embodiment Construction

[0015] A kind of pre-film agent of the present invention, described pre-film agent contains sodium hexametaphosphate, zinc sulfate, sodium tripolyphosphate, amino trimethylene phosphoric acid, acrylic acid-acrylic acid ester copolymer and water, wherein, each component is by mass percentage for:

[0016] Sodium hexametaphosphate: 20% to 30%

[0017] Zinc sulfate: 5% to 8%

[0018] Sodium tripolyphosphate: 5% to 10%

[0019] Aminotrimethylene phosphate (ATMP): 4% to 8%

[0020] Acrylic acid-acrylate copolymer: 3%~6%

[0021] The balance is water.

[0022] The using method of the present invention is:

[0023] The use concentration is (800-1000) mg / L, and the pre-film time is 24 hours in the hot state and 48 hours in the cold state. Adding WS-180 dispersant (80-100) mg / L after pre-filming for 12 hours can further improve the film-forming density.

[0024] Compared with the prior art, the present invention is a pre-filming agent with short pre-filming time and good effect,...

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Abstract

The present invention provides a kind of pre-coating agent. The pre-coating agent includes sodium hexametaphosphate, zinc sulfate, sodium tripolyphosphate, amino trimethylene phosphoric acid, acrylic acid-acrylate copolymer and water. Compared with available technology, the present invention has short pre-coating time, high effect, relaxed pre-coating condition and lower pre-coating agent consumption.

Description

Technical field: [0001] The invention relates to a chemical reagent, in particular to a reagent for cleaning metal surfaces, in particular to a pre-film agent used after metal surface cleaning. Background technique: [0002] In the prior art, the metal cooling water equipment after acid cleaning is used as a pre-coating agent before it is put into normal operation. At present, the pre-filming scheme of polyphosphate-zinc salt is widely popular in China, which is a widely used pre-filming scheme. Its advantage is that the pre-filming time is short and the effect is good; the disadvantage is that the pre-filming conditions (temperature, pH value, calcium ion concentration, etc.) are relatively harsh, and the amount of pre-filming agent is relatively large. Invention content: [0003] The technical problem to be solved by the present invention is: in the prior art, the pre-film solution of polyphosphate-zinc salt is a widely used pre-film solution. Its advantage is that the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/17
Inventor 沈志昌
Owner SHANGHAI WANSEN WATER TREATMENT CO LTD
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