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Non-phosphorus pretreatment filming agent for recirculating cooling water system and preparation and application method thereof

A technology of circulating cooling water and pre-filming agent, applied in the direction of metal material coating process, etc., can solve the problems of single film formation, slow adsorption film formation, etc., and achieve the effect of rapid film formation, low cost, and protection of water environment.

Active Publication Date: 2015-12-02
INLEN CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The phosphorus-free pre-film agent can only form an adsorption film, and the film formation of the adsorption film is relatively slow, and the film formation is single

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A phosphorus-free pre-coating agent for circulating cooling water systems. Its preparation method is: sequentially add hydrolyzed polymaleic anhydride, deionized water and concentrated sulfuric acid into the reaction equipment at a temperature of 20 ° C, and then add them in sequence during the stirring process. Sodium glutamate, sodium gluconate and zinc sulfate, stirred evenly and left to stand. The weight percent content of each raw material is: 5% of sodium glutamate, 15% of sodium gluconate, 30% of hydrolyzed polymaleic anhydride, 10% of zinc sulfate, 3% of concentrated sulfuric acid and 37% of deionized water.

[0020] Add the above-mentioned non-phosphorus pre-filming agent directly into the experimental water to carry out the rotary hanging test. The dosage concentration is 500mg / L, the test temperature is 45°C, and the test time is 48h. The water quality of the test water is: calcium hardness (measured as CaCO 3 Calculated) 210mg / L, total alkalinity (as CaCO 3...

Embodiment 2

[0022] A phosphorus-free pre-coating agent for circulating cooling water systems. Its preparation method is: sequentially add hydrolyzed polymaleic anhydride, deionized water and concentrated sulfuric acid into the reaction equipment at a temperature of 40 ° C, and then add them in sequence during the stirring process. Sodium glutamate, sodium gluconate and zinc sulfate, stirred evenly and left to stand. The weight percent content of each raw material is: 10% of sodium glutamate, 25% of sodium gluconate, 40% of hydrolyzed polymaleic anhydride, 5% of zinc sulfate, 3% of concentrated sulfuric acid and 17% of deionized water.

[0023] Add the above-mentioned non-phosphorus pre-film agent directly into the experimental water to carry out the rotary hanging test. The dosage concentration is 300mg / L, the test temperature is 45°C, and the test time is 48h. The water quality of the test water is: calcium hardness (measured as CaCO 3 Calculated) 210mg / L, total alkalinity (as CaCO 3 To...

Embodiment 3

[0025] A phosphorus-free pre-coating agent for circulating cooling water systems. Its preparation method is: sequentially add hydrolyzed polymaleic anhydride, deionized water and concentrated sulfuric acid into the reaction equipment at a temperature of 30 ° C, and then add them in sequence during the stirring process. Sodium glutamate, sodium gluconate and zinc sulfate, stirred evenly and left to stand. The weight percentage of each raw material is: 15% of sodium glutamate, 30% of sodium gluconate, 20% of hydrolyzed polymaleic anhydride, 1% of zinc sulfate, 1% of concentrated sulfuric acid and 33% of deionized water.

[0026] Add the above-mentioned non-phosphorus pre-filming agent directly into the experimental water to carry out the rotary hanging test. The dosage concentration is 400mg / L, the test temperature is 45°C, and the test time is 48h. The water quality of the test water is: calcium hardness (measured as CaCO 3 Calculated) 210mg / L, total alkalinity (as CaCO 3 Tota...

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Abstract

The invention relates to a non-phosphorus pretreatment filming agent for a recirculating cooling water system and a preparation and application method thereof and belongs to the technical field of water treatment. The non-phosphorus pretreatment filming agent for the recirculating cooling water system is composed of, by weight, 5%-15% of sodium glutamate, 15%-30% of sodium gluconate, 20%-40% of hydrolytic polymaleic anhydride, 1%-10% of zinc sulfate, 1%-3% of concentrated sulfuric acid, and the balance deionized water. The non-phosphorus pretreatment filming agent for the recirculating cooling water system is low in cost, environmentally friendly, free of pollution and high in film forming speed; a formed film is even and compact; the pH value does not need to be regulated in the pretreatment filming process; pollution discharging is not needed after pretreatment filming is completed, and the process can be directly transferred into normal operation so that a large amount of industrial water can be saved; meanwhile, the invention provides the simple and convenient preparation and application method.

Description

technical field [0001] The invention relates to a phosphorus-free pre-coating agent for a circulating cooling water system and a preparation and use method thereof, belonging to the technical field of water treatment. Background technique [0002] Prefilm agent is a class of chemicals that can preform a protective film on the metal surface during the pretreatment process of water treatment. The pre-filming agent used in industrial circulating water is mostly a composite agent of polyphosphate and zinc salt. Generally, the ratio of sodium hexametaphosphate to zinc sulfate heptahydrate is 4:1.6, which is equivalent to the ratio of sodium hexametaphosphate to zinc sulfate monohydrate. 4:1, the dosage is 400-800mg / L, the pH value of pre-coating is 5.5-6.5, and the pre-coating time is 12-48 hours. This pre-filming agent contains high phosphorus, and the turbidity is large during pre-filming, which is easy to form deposits, and the pH needs to be adjusted during the pre-filming p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/48
Inventor 邱振华张祥彬
Owner INLEN CHEM TECH
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