Preparation method of non-phosphorus pretreatment filming agent for circular cooling water treatment

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 small addition pollution and insignificant effect, and achieve the effect of reducing content, good pre-filming effect and small pollution.

Inactive Publication Date: 2019-03-01
SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the above-mentioned deficiencies and provide a kind of preparation method of the non-phosphorus prefilm agent that is used for circulating cooling water treatment, by using sodium gluconate instead of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0013] Example 1

[0014] (1) Prepare a mixed solution of calcium chloride and sodium polyacrylate, wherein the mass ratio of calcium chloride and sodium polyacrylate is 26:8;

[0015] (2) Prepare a mixed solution of zinc sulfate heptahydrate and sodium gluconate, where the mass ratio of zinc sulfate heptahydrate and sodium gluconate is 37:29;

[0016] (3) Mix the solution obtained in step (1) with the solution obtained in step (2) in a volume ratio of 1:1. The mixed solution contains four components: calcium chloride, sodium polyacrylate, zinc sulfate heptahydrate and sodium gluconate The total mass concentration is controlled at 1100mg / L, the pre-filming time is 48 hours at room temperature, and the pre-filming is completed.

[0017] Detected by the red dot method, the time for the hanging film to turn red is 32s.

Example Embodiment

[0018] Example 2

[0019] (1) Prepare a mixed solution of calcium chloride and sodium polyacrylate, where the mass ratio of calcium chloride and sodium polyacrylate is 26:8;

[0020] (2) Prepare a mixed solution of zinc sulfate heptahydrate and sodium gluconate, wherein the mass ratio of zinc sulfate heptahydrate and sodium gluconate is 47:19;

[0021] (3) Mix the solution obtained in step (1) with the solution obtained in step (2) in a volume ratio of 1:1, and the mixed solution contains four components: calcium chloride, sodium polyacrylate, zinc sulfate heptahydrate and sodium gluconate The total mass concentration is controlled at 1050mg / L, the pre-filming time is 48 hours at room temperature, and the pre-filming is completed.

[0022] Detected by the red dot method, the time for the hanging film to turn red is 29s.

Example Embodiment

[0023] Example 3

[0024] (1) Prepare a mixed solution of calcium chloride and sodium polyacrylate, where the mass ratio of calcium chloride and sodium polyacrylate is 33:10;

[0025] (2) Prepare a mixed solution of zinc sulfate heptahydrate and sodium gluconate, wherein the mass ratio of zinc sulfate heptahydrate and sodium gluconate is 40:17;

[0026] (3) Mix the solution obtained in step (1) with the solution obtained in step (2) in a volume ratio of 1:1. The mixed solution contains four components: calcium chloride, sodium polyacrylate, zinc sulfate heptahydrate and sodium gluconate The total mass concentration is controlled at 900mg / L, and the pre-filming time is 48 hours at room temperature, and the pre-filming is completed.

[0027] Detected by the red dot method, the time for the hanging film to turn red is 26s.

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PUM

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Abstract

The invention relates to a preparation method of a non-phosphorus pretreatment filming agent for circular cooling water treatment. The preparation method comprises the following steps that 1, a mixedsolution of calcium chloride and sodium polyacrylate is prepared, wherein the mass ratio of the calcium chloride to the sodium polyacrylate is 26 to 8-34 to 9; 2, a mixed solution of heptahydrate andsodium gluconate is prepared, wherein the mass ratio of the heptahydrate to the sodium gluconate is 35 to 31-41 to 16; 3, the mixed solution obtained in the step is mixed solution obtained in the step2 according to the volume ratio of 1 to 1, and the obtained mixed solution is the non-phosphorus pretreatment filming agent for circular cooling water treatment. Compared with the prior art, sodium phosphate is replaced by the sodium gluconate, the sodium gluconate is compounded with the sodium polyacrylate, the shortcomings of poor stability and non-significant effect of an existing pretreatmentfilming agent are overcome, the adding amount is small, a pretreatment filming effect is good, and the pretreatment filming agent can be used for a long time, is economic, friendly to the environmentand can be suitable for industrial circular cooling water treatment.

Description

[technical field] [0001] The invention belongs to the field of industrial water treatment, in particular to a preparation method of a phosphorus-free prefilming agent used for circulating cooling water treatment. [Background technique] [0002] Pre-film is an essential part of industrial water treatment technology. Pre-film is an important means to improve the corrosion resistance of circulating water equipment. It is important to form a dense and corrosion-resistant protective film on the metal surface after chemical cleaning. The main way of membrane. The pre-filming agent has been using the compound formula of phosphate and zinc salt in the 1970s. Orthophosphate is produced by hydrolysis of phosphate in water, but orthophosphate will form insoluble precipitates with calcium ions or zinc ions in water, so that the pre-filming agent can achieve the desired pre-filming effect. [0003] At present, the most commonly used pre-filming agent is a special formula of polyphospha...

Claims

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Application Information

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IPC IPC(8): C23C22/68
CPCC23C22/68
Inventor 王根礼
Owner SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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