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Cleanable asymmetrical dimethyl hydraxine and dinitrogen tetraoxide cleaning agent and preparation thereof

A technology of dinitrogen tetroxide and unsymmetrical dimethyl hydrazine is applied in chemical instruments and methods, detergent compositions, non-surface-active detergent compositions, etc., and can solve the problems of high price and inability to clean with dinitrogen tetroxide. , to achieve the effect of low cost, easy cleaning process and low ODP value

Inactive Publication Date: 2008-11-05
中国航天科技集团公司第六研究院第一六五研究所
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0005] The purpose of this invention is to propose a cleaning agent that can clean unsymmetrical dimethylhydrazine and dinitrogen tetroxide, which solves the technical problem that existing non-aqueous non-ODS cleaning agent products are expensive and cannot be used for dinitrogen tetroxide cleaning

Method used

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Examples

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Embodiment Construction

[0025] Wash the reaction kettle, storage container, agitator and other equipment with deionized water and dry them for later use. After pumping the main solvent (dichloromethane) into the reaction kettle with a diaphragm pump, measure 70 to 90 parts first under the conditions that the stirring speed is not greater than 120 rpm, the pressure is 0.2 to 1Mpa, and the temperature is 0 to 30°C. Pour the volume of the main solvent into the reaction kettle, then measure 5 to 15 volumes of functional modifier (ethanol or ethyl acetate) and slowly add it into the reactor, and stir with a stirrer while adding the functional modifier. After finishing the functional modifier, adjust the pressure to 0.6Mpa and the temperature to 10-20°C, then continue to stir the mixed solution for 2-5 hours to obtain a colorless and transparent mixed solution. Then take 5-15 volumes of additives (ethyl formate) and pour them into the reactor, and stir for 2-5 hours under the conditions of pressure 1-2Mpa ...

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Abstract

The invention relates to a cleaning agent that can clean the unsymmetrical dimethylhydrazine and nitrogen tetroxide, comprising dichloromethane of 70 to 90 parts, lower alcohol of 5 to 15 parts, and ethyl formate of 5 to 15 parts. The cleaning agent comprises the preparation steps as follows: putting the dichloromethane into a reaction vessel, and stirring while adding the lower alcohol; then adding the ethyl formate and continuing stirring to acquire the cleaning agent. The cleaning agent overcomes the high price of the existing non-aqueous and non-ODS cleaning agent, solves the technical problem of failing to clean the nitrogen tetroxide, can be used for cleaning the unsymmetrical dimethylhydrazine and nitrogen tetroxide, and can be compatible with the common metallic and nonmetallic materials. With free of impact on human bodies, little damage to ozone layer and low cost, the cleaning agent can replace Freon CFC-113 for the cleaning of oil.

Description

technical field [0001] The invention relates to a cleaning agent and a preparation method thereof, in particular to a cleaning agent capable of cleaning unsymmetrical dimethylhydrazine and dinitrogen tetroxide and a preparation method thereof. Background technique [0002] The main types of cleaning agents are: aqueous cleaning agents, semi-aqueous cleaning agents and non-aqueous cleaning agents. For the cleaning of sophisticated and complex rocket engines, due to the contact of dinitrogen tetroxide with water, it can generate highly corrosive nitric acid, nitrous acid, and nitrates formed with metal materials, forming strong chemical and electrochemical corrosion. Most metal materials are not resistant to this corrosion, which greatly shortens the service life of the facility and poses a safety hazard. In addition, considering that there should be no residue after cleaning and the temperature requirements for cleaning, water-based cleaning should be avoided as much as possib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11D7/30C11D7/26
Inventor 梁兴国李宁孟圈昌杨超兰海平符全军
Owner 中国航天科技集团公司第六研究院第一六五研究所
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