Combustion residue cleaning agent and preparation method thereof

Abstract

The invention discloses a combustion residue cleaning agent and a preparation method thereof, and belongs to the technical field of industrial cleaning. The cleaning agent comprises the following raw material components in percentage by mass: 2-6% of fatty alcohol polyoxyethylene ether sodium sulfate, 0.6-1.8% of sodium dodecyl benzene sulfonate, 0.5-2% of a chelating agent, 0.2-2% of a tackifier, 0.5-0.2% of an acidity regulator and the balance of water. According to the cleaning agent, through the synergistic effect of the surfactant, the chelating agent and the acid agent, efficient integrated cleaning of complex coke in the rocket launch canister is achieved; the multiple mechanisms of emulsification-complexation-dissolution are synergistic, so that the tediousness of step-by-step cleaning is avoided, and the cleaning efficiency and thoroughness are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of industrial cleaning, and specifically relates to a combustion residue cleaning agent and a preparation method thereof. BACKGROUND

[0002] When a rocket is launched, it mainly relies on the high-pressure gas generated by the instantaneous combustion of the gas generator (or propellant) in the barrel to "shoot" the rocket out of the barrel. This process leaves specific combustion residues in the launch barrel. After launching, the inner wall of the launch barrel will be left with combustion products (such as propellant residues, metal oxides, and carbides of solid rocket engines), forming a coking layer. The combustion of commonly used composite solid propellant fuel and aluminum powder fuel produces a large amount of small solid particles of metal oxides (such as aluminum oxide) and salts (such as potassium chloride). Incomplete combustion of organic binders produces complex hydrocarbon residues, carbon black, and soot. In addition, the combustion catalysts in the propellant, such as iron oxide and copper-chromium oxide, produce metal particles that adhere to the inner wall of the launch barrel, the bottom cover, and the channel through which the gas flows in the form of smoke, forming hard carbon deposits and dirt. These residues can affect the safety and reliability of subsequent launches, and after each launch, the launch barrel must be professionally cleaned and maintained to remove these residues. Otherwise, the accumulated dirt can affect the environment in the barrel and may corrode or damage the instruments and equipment.

[0003] High-pressure water jet cleaning in mechanical cleaning methods is a common method for cleaning combustion residues in rocket launch barrels. It uses high-pressure water (100-300 MPa) to impact the coking layer and strip off the residues, but the water pressure needs to be controlled to avoid damaging the inner wall coating or structure of the launch barrel. Dry ice cleaning uses high-speed jetting of dry ice particles (-78℃) to remove coking through low-temperature embrittlement and impact force, but the equipment cost is high and the effect of removing thick coking layers is limited. Ultrasonic cleaning immerses the launch barrel in a cleaning solution and uses ultrasonic cavitation to strip off the coking layer, which is not suitable for large launch barrels. Alkaline cleaning agents in chemical cleaning methods use sodium hydroxide and sodium carbonate solutions to dissolve organic residues (such as binders and unburned hydrocarbons), but the aluminum inner wall needs to be protected from strong alkali corrosion. Acidic cleaning agents such as nitric acid, phosphoric acid, or composite acids can remove metal oxides (such as Al2O3 and Fe2O3), but there is a risk of corrosion of the launch barrel substrate. Solvent cleaning usually uses N-methyl pyrrolidone and dimethyl sulfoxide to dissolve high molecular residues (such as thermal insulation layer rubber and coating), which requires explosion-proof ventilation and avoidance of toxic exposure. Thermal decomposition method uses high temperature (300-500℃) baking to oxidize or pyrolyze residues, which does not require contact cleaning and is suitable for large launch barrels. However, it has high energy consumption and may affect the performance of the barrel material. Laser cleaning technology for combustion residues in rocket launch barrels uses high-energy laser pulses to ablate the coking layer (wavelength 1064 nm or 10.6 mm), which is precise and controllable, and does not cause contact pollution. However, the equipment is expensive and has low efficiency.

[0004] The key point in cleaning the combustion residues in the rocket launching tube is to efficiently remove the residues and protect the base material and the inner wall heat-resistant coating (such as silicone rubber and phenolic resin) of the launching tube. The high-pressure water jet, rotary brush washing combined with cleaning agent is an efficient and low-cost cleaning scheme, but the currently used cleaning agent is mostly strong acid, strong alkali or organic solvent, which is corrosive to the base material or toxic to the human body. Therefore, it is imperative to develop a green and environmentally friendly low-toxicity biodegradable cleaning agent, which has good practical significance. SUMMARY

[0005] The present application overcomes the shortcomings of the prior art and provides a combustion residue cleaning agent and a preparation method thereof.

[0006] The present application is implemented by the following technical solutions: A combustion residue cleaning agent, by mass percentage, the raw material components of the cleaning agent are: fatty alcohol polyoxyethylene ether sodium sulfate 2-6%, sodium dodecyl benzene sulfonate 0.6-1.8%, chelating agent 0.5-2%, tackifier 0.2-2%, acidity regulator 0.5-0.2%, and the balance is water.

[0007] Preferably, sodium dodecyl sulfate is used instead of sodium dodecyl benzene sulfonate.

[0008] Preferably, a-alkenyl sodium sulfonate is used instead of fatty alcohol polyoxyethylene ether sodium sulfate.

[0009] Preferably, the chelating agent is one or any combination of sodium citrate, potassium sodium tartrate, and disodium ethylenediaminetetraacetate.

[0010] Preferably, the tackifier is one or any combination of hydroxypropyl methylcellulose, sodium carboxymethylcellulose, xanthan gum, hydroxyethyl cellulose, and polyvinyl alcohol.

[0011] Preferably, the acidity regulator is one of citric acid, acetic acid, tartaric acid, sodium carbonate, sodium bicarbonate, and sodium hydroxide.

[0012] Preferably, the water is one of purified water, deionized water, and soft water.

[0013] The preparation method of the combustion residue cleaning agent comprises the following steps: 1) Calculate the amount of fatty alcohol polyoxyethylene ether sodium sulfate, sodium dodecyl benzene sulfonate, chelating agent, tackifier, acidity regulator, and water according to the formula and yield, and accurately weigh them for standby use; 2) Mix the weighed fatty alcohol polyoxyethylene ether sodium sulfate, sodium dodecyl benzene sulfonate, chelating agent, and tackifier thoroughly; 3) Put the measured water into the container, start the mechanical stirring, then put the mixed powder into the water in batches, and dissolve the next batch after the previous batch is dissolved until all the powder is dissolved; 4) Put the calculated amount of acidity regulator into the solution containing the raw materials, and stir while adding until all the acidity regulator is dissolved; 5) Let the mixed solution stand for 0.5-2 hours, and after defoaming, a colorless and transparent combustion residue cleaning agent is obtained.

[0014] Preferably, in step 3), the dissolution temperature is 20-30℃.

[0015] Preferably, in step 4), the pH value is adjusted to 6-6.5.

[0016] The beneficial effects of the present application relative to the prior art are: 1. High efficient comprehensive decontamination ability The present cleaning agent realizes high efficient integrated cleaning of complex coking (organic carbon deposit and inorganic metal oxide) in the rocket launching tube through the synergistic effect of surfactants, chelating agents and acid agents. Anionic surfactants can strongly penetrate, emulsify and strip stubborn organic carbon deposit layer; sodium citrate as an organic chelating agent can safely and selectively complex and dissolve iron oxide and aluminum oxide and other hard scale; citric acid provides a weak acidic environment, further promoting the dissolution of metal oxides. This multiple mechanism of "emulsification-complexation-dissolution" synergistically enhances the cleaning efficiency and thoroughness.

[0017] 2. High safety to the substrate and low corrosiveness The formula discards traditional strong acid, strong base or toxic organic solvent, and all uses environmentally friendly mild components. The pH buffer system composed of citric acid and sodium citrate can maintain the acidity of the cleaning solution at a low level while effectively dissolving inorganic scale, greatly reducing the potential corrosion risk to the metal substrate (such as special steel or aluminum alloy) of the launching tube. This mild property prolongs the service life of the equipment, reduces the damage caused by the cleaning process itself, and ensures that the key performance and reliability of the rocket launching device are not affected.

[0018] 3. Environmental friendliness and operational safety All components (such as citrate, surfactants with good biodegradability) have low toxicity and biodegradability, meeting environmental protection requirements. The waste liquid generated after cleaning is easy to handle, and the environmental hazard is much smaller than using hydrogen fluoride, concentrated nitric acid or strong base in traditional processes. At the same time, the mild formula also greatly reduces the health risk of the operator, and does not need to be equipped with extremely strict protective measures as when using high-risk chemicals, improving the working conditions, reducing the safety hazards and subsequent waste liquid treatment costs.

[0019] 4. Easy to operate, strong adaptability The formula is a water-based solution with adjustable viscosity, simple operation, and can be constructed by various methods such as soaking, spraying, and circulating washing. The addition of the tackifier hydroxypropyl methyl cellulose makes the cleaning agent especially suitable for the inner wall of the vertical or inclined launch tube. It can increase the adhesion of the liquid, prolong the contact reaction time of the active ingredients and the coking, and ensure that the cleaning agent does not flow away too quickly, so that a thorough cleaning effect can be achieved on the surface of complex structures, improving the convenience of construction and the uniformity of cleaning.

[0020] 5. Adjustable function, flexible application The formula design shows good adjustability. By simply replacing the type of surfactant (such as replacing sodium dodecyl benzene sulfonate with sodium dodecyl sulfate), the physical properties (such as foaming) of the cleaning agent can be quickly changed to adapt to different cleaning process requirements. The high-foaming type is suitable for vertical surface cleaning that requires long-term contact, while the low-foaming type is more suitable for pump circulation cleaning. This flexibility allows a basic formula to address a variety of specific application scenarios, improving the versatility and economy of the product. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Preparation technical flow chart of combustion residue cleaning agent. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects of the present invention clearer, the present invention will be further described in detail in conjunction with the embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the present invention. The technical solutions of the present invention are described in detail below in conjunction with the embodiments and drawings, but the protection scope is not limited thereto. Example 1

[0023] This embodiment proposes a combustion residue cleaning agent; the cleaning agent is composed of water, surfactant, chelating agent, tackifier and acidity regulator.

[0024] The cleaning agent consists of 2% sodium fatty alcohol polyoxyethylene ether sulfate, 1.8% sodium dodecyl benzene sulfonate, 1% sodium citrate, 1.2% hydroxypropyl methyl cellulose, 0.2% citric acid, and the balance of water. Among them, sodium fatty alcohol polyoxyethylene ether sulfate and sodium dodecyl benzene sulfonate are surfactants, sodium citrate is a chelating agent, hydroxypropyl methyl cellulose is a tackifier, and citric acid is an acidity regulator.

[0025] The formula of this embodiment is designed according to the analysis of the coking components of the rocket launching tube, aiming to develop a high-efficiency and environmentally friendly special cleaning agent for removing stubborn coking residues (including aluminum oxide, iron oxide, and carbon deposits) inside the rocket launching tube. The core of the design is to decompose organic carbon deposits through the penetration and emulsification of surfactants, to complex metal oxides with chelating agents, to extend the residence time of the cleaning agent with tackifying agents, and to optimize the reaction environment with acidity regulators, ultimately achieving rapid softening and peeling of the coking layer under low temperature conditions while avoiding corrosion of the launching tube substrate. The formula components are all environmentally friendly materials, taking into account safety and operational convenience.

[0026] Efficacy of each component in removing coking: Surfactant (such as fatty alcohol polyoxyethylene ether sodium sulfate, sodium dodecyl benzene sulfonate): reduces interfacial tension, penetrates coking layer, emulsifies and disperses carbon deposits and oily residues.

[0027] Chelating agent (sodium citrate): specifically complexes metal ions such as iron oxide, chromium oxide, and copper oxide, disrupting the crystal structure of inorganic substances in coking, causing them to dissolve or loosen.

[0028] Tackifier (hydroxypropyl methyl cellulose): increases the viscosity of the cleaning agent, extends the action time, and ensures that the active ingredients penetrate deeply into the coking layer.

[0029] Acidity regulator (citric acid): adjusts the pH to weakly acidic, promoting the dissolution of metal oxides while avoiding corrosion of the metal substrate by strong acids. Example 2

[0030] This embodiment proposes a rapid high-foam cleaning agent for combustion residues; the cleaning agent is composed of water, surfactant, chelating agent, tackifier, and acidity regulator.

[0031] The cleaning agent composition is as follows in mass percentage: fatty alcohol polyoxyethylene ether sodium sulfate 5%, sodium dodecyl sulfate 1.2%, potassium sodium tartrate 2%, sodium carboxymethyl cellulose 0.5%, citric acid 0.4%, and water in the balance. Among them, fatty alcohol polyoxyethylene ether sodium sulfate and sodium dodecyl sulfate are surfactants, potassium sodium tartrate is a chelating agent, sodium carboxymethyl cellulose is a tackifier, and citric acid is an acidity regulator.

[0032] Replacing sodium dodecyl benzene sulfonate with sodium dodecyl sulfate can enhance foaming and improve vertical surface adhesion. After foaming, the foam can be used for cleaning. Example 3

[0033] This embodiment proposes a rapid high-foam cleaning agent for combustion residues; the cleaning agent is composed of water, surfactant, chelating agent, tackifier, and acidity regulator.

[0034] The cleaning agent is composed of a-alkenyl sodium sulfonate 3%, sodium dodecyl sulfate 1.2%, potassium sodium tartrate 2%, sodium carboxymethyl cellulose 0.5%, citric acid 0.4%, and water in remainder. Among them, a-alkenyl sodium sulfonate and sodium dodecyl sulfate are surfactants, potassium sodium tartrate is a chelating agent, sodium carboxymethyl cellulose is a viscosity enhancer, and citric acid is an acidity regulator.

[0035] After sodium dodecyl sulfate replaces sodium dodecyl benzene sulfonate, the foaming property can be enhanced, and the vertical surface adhesion capacity can be improved. After foaming, the foam can be used for cleaning.

[0036] The effects of removing coke of each component: Surfactants (such as a-alkenyl sodium sulfonate and sodium dodecyl sulfate): reduce interfacial tension, penetrate coking layer, emulsify and disperse carbon and oily residues.

[0037] Chelating agent (potassium sodium tartrate): specifically complex metal ions such as iron oxide, chromium oxide copper, destroy the crystal structure of inorganic matter in coking, and make it dissolve or loosen.

[0038] Viscosity enhancer (sodium carboxymethyl cellulose): increase the viscosity of the cleaning agent, prolong the action time, and ensure that the effective components penetrate into the deep layer of coking.

[0039] Acidity regulator (citric acid): adjust the pH to weakly acidic, promote the dissolution of metal oxides, and at the same time avoid the corrosion of strong acid to the metal matrix. Example 4

[0040] This embodiment proposes a kind of combustion residue fast high-foam cleaning agent;The cleaning agent is composed of water, surfactant, chelating agent, viscosity enhancer and acidity regulator.

[0041] The cleaning agent is composed of a-alkenyl sodium sulfonate 3%, sodium dodecyl sulfate 1.2%, potassium sodium tartrate 2%, sodium carboxymethyl cellulose 0.5%, citric acid 0.4%, and water in remainder. Among them, a-alkenyl sodium sulfonate and sodium dodecyl sulfate are surfactants, potassium sodium tartrate is a chelating agent, sodium carboxymethyl cellulose is a viscosity enhancer, and citric acid is an acidity regulator. Example 5

[0042] This embodiment proposes a kind of combustion residue cleaning agent;The cleaning agent is composed of water, surfactant, chelating agent, viscosity enhancer and acidity regulator.

[0043] The cleaning agent comprises, in percentage by mass, 0.6% of sodium a-alkenyl sulfonate, 1.8% of sodium dodecyl benzene sulfonate, 0.5% of disodium ethylenediaminetetraacetate, 0.2% of hydroxyethyl cellulose, 0.4% of sodium carbonate, and the balance of water. The sodium a-alkenyl sulfonate and the sodium dodecyl benzene sulfonate are surfactants, the disodium ethylenediaminetetraacetate is a chelating agent, the hydroxyethyl cellulose is a tackifier, and the sodium carbonate is an acidity regulator. Example 6

[0044] The present embodiment provides a preparation method of a combustion residue cleaning agent, according to the raw material formula of Example 1, and comprising the following steps: (1) The amounts of sodium fatty alcohol polyoxyethylene ether sulfate, sodium dodecyl benzene sulfonate, sodium citrate, hydroxypropyl methyl cellulose, citric acid and water are calculated according to the formula and yield, and accurately weighed for standby; (2) The weighed sodium fatty alcohol polyoxyethylene ether sulfate, sodium dodecyl benzene sulfonate, sodium citrate and hydroxypropyl methyl cellulose are fully mixed; (3) The measured water is placed in a container, the mechanical stirring is started, and then the mixed powder is scattered into the water in batches, and the next batch is scattered after the previous batch is dissolved, until all are dissolved, and the dissolution temperature is 25°C; (4) The calculated amount of citric acid is scattered into the solution in which the raw materials are dissolved, and stirred while adding, until the citric acid is completely dissolved, and a small amount of sodium carbonate is used to adjust the pH value to 6-6.5; (5) The mixed solution is left for about 1 hour, and the defoaming special combustion residue cleaning agent is obtained; Specifically, in step (1), the water can be purified water, deionized water, soft water, etc.

[0045] In step (2), the hydroxypropyl methyl cellulose is fully mixed with the sodium fatty alcohol polyoxyethylene ether sulfate, the sodium dodecyl benzene sulfonate and the sodium citrate before being dissolved, and the salt powder can disperse the hydroxypropyl methyl cellulose, so as to avoid agglomeration and clumping during the dissolution process, and the rapid dissolution of the salt is used to accelerate the dissolution of the hydroxypropyl methyl cellulose.

[0046] The present application also provides a special combustion residue cleaning agent obtained by the above formula and preparation method, which is a colorless transparent colorless liquid with certain viscosity, with a pH of 6-6.5 and weak acidity.

[0047] The present application provides a method for using a special-purpose combustion residue cleaning agent. The cleaning agent foams moderately and can be sprayed directly onto the combustion residue on the wall of a launch tube by a high-pressure jet, or can be rolled on so that the cleaning agent stays on the surface of the residue for 1-15 minutes, allowing it to penetrate into the interior of the residue layer and dissolve some of the components, thereby destroying the structure of the coking layer, so that the residue can be removed subsequently by a high-pressure water jet or a rotating brush. A fast high-foam cleaning agent needs to be combined with a large-bubble tank to produce a large amount of foam on the combustion residue, and then the residue is removed by a high-pressure water jet and a rotating brush.

[0048] The present application encompasses any alternatives, modifications, equivalent methods and solutions made to the essence and scope of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

[0049] In order for the public to have a thorough understanding of the present application, specific details are described in the above preferred embodiments of the present application, and the present application can also be completely understood without the description of these details by those skilled in the art. Several improvements and refinements can also be made without departing from the principles of the present application, and these improvements and refinements shall also be considered as the protection scope of the present application.

Claims

1. A combustion residue cleaning agent, characterized in that, The cleaning agent consists of the following components by weight percentage: sodium fatty alcohol polyoxyethylene ether sulfate 2-6%, sodium dodecylbenzene sulfonate 0.6-1.8%, chelating agent 0.5-2%, thickener 0.2-2%, acidity regulator 0.5-0.2%, and the balance being water.

2. The combustion residue cleaning agent according to claim 1, characterized in that, Sodium dodecyl sulfate can be used instead of sodium dodecylbenzenesulfonate.

3. The combustion residue cleaning agent according to claim 1, characterized in that, Use sodium α-alkenyl sulfonate instead of sodium fatty alcohol polyoxyethylene ether sulfate.

4. The combustion residue cleaning agent according to claim 1, characterized in that, The chelating agent is one or any combination of sodium citrate, potassium sodium tartrate, and disodium ethylenediaminetetraacetate.

5. The combustion residue cleaning agent according to claim 1, characterized in that, The thickener used is one or any combination of hydroxypropyl methylcellulose, sodium carboxymethyl cellulose, xanthan gum, hydroxyethyl cellulose, and polyvinyl alcohol.

6. The combustion residue cleaning agent according to claim 1, characterized in that, The acidity regulator used is one of citric acid, acetic acid, tartaric acid, sodium carbonate, sodium bicarbonate, or sodium hydroxide.

7. The combustion residue cleaning agent according to claim 1, characterized in that, The water is a type of purified water, deionized water, or soft water.

8. A method for preparing a combustion residue cleaning agent according to any one of claims 1-7, characterized in that, Includes the following steps: 1) Calculate the dosage of sodium fatty alcohol polyoxyethylene ether sulfate, sodium dodecylbenzene sulfonate, chelating agent, thickener, acidity regulator and water according to the formula and production volume, and weigh them accurately for later use; 2) Thoroughly mix the weighed sodium fatty alcohol polyoxyethylene ether sulfate, sodium dodecylbenzene sulfonate, chelating agent, and thickener; 3) Place the measured amount of water in a container, turn on the mechanical stirrer, and then sprinkle the mixed powder into the water in batches. After the previous batch dissolves, sprinkle the next batch in, until all the powder dissolves. 4) Add the calculated amount of acidity regulator to the solution containing the raw materials while stirring until the acidity regulator is completely dissolved; 5) Let the mixed solution stand for 0.5 to 2 hours. After defoaming, a colorless and transparent cleaning agent for combustion residues can be obtained.

9. The method for preparing a combustion residue cleaning agent according to claim 8, characterized in that, In step 3), the dissolution temperature is 20~30℃.

10. The method for preparing a combustion residue cleaning agent according to claim 8, characterized in that, In step 4), adjust the pH value to 6-6.5.

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