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A kind of phosphorus-free water-based degreasing agent and its preparation method and application

A degreasing agent, water-based technology, applied in the field of phosphorus-free water-based degreasing agent and its preparation, can solve the problems of difficult degreasing, low degreasing efficiency, high concentration, etc., achieve good degreasing effect, low degreasing temperature, uniform phosphating film Effect

Inactive Publication Date: 2017-12-12
CHANGSHA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: 1) It contains phosphorus and nitrogen, the two most important elements that can cause eutrophication of water bodies, and the concentration is relatively high; 2) It is used at room temperature or 30-45 ° C, and it may not be effective when the temperature is low in winter. Degreasing is clean; 3) During the degreasing process, the oil on the surface of the workpiece enters the degreasing agent. As the oil concentration in the degreasing agent becomes higher and higher, the degreasing efficiency will become lower and lower. When the oil concentration reaches a certain value, the degreasing effect will be lost. capacity, resulting in scrapped degreaser, short service life and low utilization rate of materials
Its disadvantages are: 1) The degreasing temperature is 25-35 ℃, and it is difficult to degrease cleanly when the temperature is low in winter and early spring; 2) The degreasing agent becomes invalid as the oil concentration increases, the service life is short, and the material utilization rate is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The content of each component of the phosphorus-free water-based degreasing agent is as follows:

[0061] Nonylphenol polyoxyethylene ether, 8 g / L, HLB value 11-13;

[0062] Alkylphenol polyoxyethylene ether, 6 g / L, HLB value 11-13;

[0063] Instant sodium metasilicate 7 g / L;

[0064] Sodium carbonate 3 g / L;

[0065] Isopropanol 2 g / L;

[0066] Dichloromethane 11 g / L;

[0067] Ethylene glycol monoethyl ether 5 g / L;

[0068] Low molecular weight sodium polyacrylate 1 g / L, relative molecular weight 3000;

[0069] Defoaming King 0.2 g / L;

[0070] Triethanolamine 1 g / L;

[0071] The rest is water.

[0072] The preparation method of described phosphorus-free water-based degreasing agent:

[0073] While stirring, add 7 g of instant sodium metasilicate, 3 g of sodium carbonate, 1 g of low-molecular-weight sodium polyacrylate and 1 g of triethanolamine into 800 mL of water in sequence, and dissolve to obtain a mixed aqueous solution, and then add 8 g of nonylphenol pol...

Embodiment 2

[0081] The content of each component of the phosphorus-free water-based degreasing agent is as follows:

[0082] Nonylphenol polyoxyethylene ether, 9 g / L, HLB value 11-13;

[0083] Alkylphenol polyoxyethylene ether, 5 g / L, HLB value 11-13;

[0084] Anhydrous sodium metasilicate 6 g / L;

[0085] Sodium carbonate 3 g / L;

[0086] Isopropanol 2 g / L;

[0087] Dichloromethane 10 g / L;

[0088] Ethylene glycol monoethyl ether 5 g / L;

[0089] Low molecular weight sodium polyacrylate, 1 g / L, relative molecular weight is 3000;

[0090] Defoaming King 0.3 g / L;

[0091] Triethanolamine 1 g / L;

[0092] The rest is water.

[0093]The preparation method of described phosphorus-free water-based degreasing agent:

[0094] While stirring, add 6 g of anhydrous sodium metasilicate, 3 g of sodium carbonate, 1 g of low molecular weight sodium polyacrylate and 1 g of triethanolamine into 800 mL of water in sequence, and dissolve to obtain a mixed aqueous solution, and then add 9 g of nonylphe...

Embodiment 3

[0102] The content of each component of the phosphorus-free water-based degreasing agent is as follows:

[0103] Nonylphenol polyoxyethylene ether, 9 g / L, HLB value 11-13;

[0104] Alkylphenol polyoxyethylene ether, 5 g / L, HLB value 11-13;

[0105] Anhydrous sodium metasilicate 7 g / L;

[0106] Sodium carbonate 3 g / L;

[0107] Isopropanol 3 g / L;

[0108] Dichloromethane 8 g / L;

[0109] Ethylene glycol monoethyl ether 3 g / L;

[0110] Low molecular weight sodium polyacrylate 1 g / L, relative molecular weight 3000;

[0111] Defoaming King 0.2 g / L;

[0112] Triethanolamine 1.5 g / L;

[0113] The rest is water.

[0114] The preparation method of described phosphorus-free water-based degreasing agent:

[0115] While stirring, add 7 g of anhydrous sodium metasilicate, 3 g of sodium carbonate, 1 g of low-molecular-weight sodium polyacrylate and 1.5 g of triethanolamine into 800 mL of water in sequence, and dissolve to obtain a mixed aqueous solution, and then add 9 g of nonylphe...

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Abstract

A non-phosphorous water-based degreasing agent and its preparation method and application. The non-ionic water-based degreasing agent is composed of non-ionic emulsifier, non-ionic penetrating agent, sodium metasilicate, sodium carbonate, isopropanol, dichloromethane, It is prepared from ethylene glycol monoethyl ether, low molecular weight sodium polyacrylate, defoamer, triethanolamine and water. The preparation method is as follows: adding sodium metasilicate, sodium carbonate, low-molecular-weight sodium polyacrylate and triethanolamine into water sequentially while stirring, and dissolving to obtain a mixed aqueous solution, then mixing and stirring the remaining components evenly, adding the mixed aqueous solution In, stir well, Serve. The phosphorus-free water-based degreasing agent of the invention is mainly used for degreasing iron and steel workpieces. The degreasing agent of the invention does not contain phosphorus, can be reused, and has good degreasing effect; after degreasing treatment, the water film on the surface of the test piece is uniform, and the oil hanging amount on the steel surface is less than 0.2 g / m2, which provides a good steel surface for subsequent phosphating treatment.

Description

technical field [0001] The invention relates to a phosphorus-free water-based degreasing agent and its preparation method and application, in particular to a phosphorus-free water-based degreasing agent for steel surface coating pretreatment and its preparation method and application. Background technique [0002] Due to the anti-corrosion measures adopted in the manufacture of steel workpieces and the pollution during processing, oil stains must adhere to the surface of steel workpieces. Mr. Chen Kezhong proposed in "Metal Surface Anticorrosion Technology" that the amount of oil hanging on the surface of steel workpieces should be less than 0.2 g / m 2 , otherwise it will affect the formation of phosphating film, thereby affecting the quality of the coating. Therefore, the degreasing agent must be used to remove the oil on the steel surface in the treatment of the steel surface before coating. [0003] Degreasing agents can be divided into dipping degreasing agents, spraying...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G5/036
Inventor 余取民雷敏李艳华刘迎新
Owner CHANGSHA UNIVERSITY
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