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A kind of alkaline lotion and preparation method thereof

A technology of alkaline washing liquid and solution, applied in the field of low temperature liquid storage tank preparation, can solve the problems of unmaintainable, difficult to achieve vacuum, easily contaminated with oil and dust, etc., and achieve the effect of preventing corrosion

Active Publication Date: 2015-10-14
NINGBO MINGXIN CHEM MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The outer surface of the inner container and the inner surface of the outer shell are easily contaminated with oil, dust and other impurities during the manufacturing process, which will make it difficult to achieve the vacuum degree and cannot maintain it within the specified range

Method used

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  • A kind of alkaline lotion and preparation method thereof
  • A kind of alkaline lotion and preparation method thereof
  • A kind of alkaline lotion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Prepare an alkaline wash as follows:

[0020] Step 1, using water as a solvent to prepare the following five solutions respectively: A nonylphenol polyoxyethylene ether solution with a mass concentration of 5%, sodium hydroxide solution with a mass concentration of B of 15%, and anhydrous solution with a mass concentration of C of 35%. Sodium silicate solution, D mass concentration is 25% anhydrous sodium carbonate solution, E mass concentration is 20% sodium pyrophosphate solution;

[0021] Step 2: weigh the above solution by the following mass:

[0022]

[0023] Mix the above components at room temperature, add water to dilute to 50L, and complete the preparation to obtain the alkaline lotion of the present invention.

[0024] Brush 3-5 times on the surface of the steel to be treated. After standing for 15 minutes, rinse it with water through a high-pressure water gun. The wastewater is diluted and neutralized to neutral.

[0025] The degreasing effect of this em...

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Abstract

The invention discloses an alkaline washing solution. The alkaline washing solution is characterized in that the alkaline washing solution is prepared from the raw materials in percentage by weight: 1.5g / L of polyoxyethylene nonylphenyl ether, 4.5g / L of sodium hydroxide, 10.5g / L of anhydrous sodium silicate, 7.5g / L of anhydrous sodium carbonate, 6.0g / L of sodium pyrophosphate and the balance of water. The alkaline washing solution disclosed by the invention is used for steel washing of the outer surface of an inner container and the inner surface of a housing during the preparation process of a low-temperature liquid storage tank, and after washing by the alkaline washing solution, the degreasing effect of the outer surface of the inner container and the inner surface of the housing can be ensured, and the surface grease residual quantity is not more than 50mg / m<2>; the alkaline concentration can achieve the lowest level and further prevent the corrosion of steel; and after washing, the vacuum degree between the outer surface of the inner container and the inner surface of the housing can be ensured to be maintained in a stipulated range.

Description

technical field [0001] The invention belongs to the field of preparation of low-temperature liquid storage tanks, and in particular relates to an alkali washing solution used in the preparation process of low-temperature liquid storage tanks. Background technique [0002] The alkali washing solution is mainly used for removing oil, dust and other impurities on the steel surface during the manufacturing process of the cryogenic liquid storage tank. The cryogenic liquid storage tank is generally composed of a stainless steel inner container and a carbon steel outer shell. Pearlescent sand (called vacuum powder low-temperature insulation) is filled between the outer shell and the inner container and vacuumized to store liquid oxygen, liquid nitrogen, liquid argon, liquid carbon dioxide, Purpose of cryogenic liquids such as liquefied natural gas. The outer surface of the inner container and the inner surface of the outer shell are easily contaminated with oil, dust and other im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/14C23G1/19
Inventor 叶青
Owner NINGBO MINGXIN CHEM MACHINERY
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