CN1232627C - Cleanning agent and preparing method, and application in cleaning without stopping engine - Google Patents

Cleanning agent and preparing method, and application in cleaning without stopping engine Download PDF

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Publication number
CN1232627C
CN1232627C CN 03122823 CN03122823A CN1232627C CN 1232627 C CN1232627 C CN 1232627C CN 03122823 CN03122823 CN 03122823 CN 03122823 A CN03122823 A CN 03122823A CN 1232627 C CN1232627 C CN 1232627C
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China
Prior art keywords
cleaning
water
agent
cleaning agent
days
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CN 03122823
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Chinese (zh)
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CN1539940A (en
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弓宁满
李德福
李桦
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蓝星清洗工程有限公司
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Abstract

The present invention provides a cleaning agent. Chelant and a dispersing agent which comprises hydroxy group, carboxy group, phosphonio group, sulfonic group, etc. are used for chelating the ions of Ca<2+>, Mg<2+>, Fe<2+>, Fe<2+>, etc. in order to produce a soluble chelate complex. A large quantity of dirt components are stably dispersed and suspended in water in a particulate state under the dispersing action of the dispersing agent in order to dissolve and disperse dirt, so that the purpose of cleaning is achieved. Meanwhile, the present invention also provides the application of the cleaning agent in the process of cleaning water circulating systems, particularly in a central air conditioning system without stopping the machines. When the cleaning agent of the present invention is used in the cleaning process without stopping the machines, the corrosion rate is low, and the present invention is suitable for a plurality of materials, such as carbon steel, copper, aluminum, etc. The scale and rust removing effect of the present reaches or approaches to the cleaning effect in a state when the machines are stopped.

Description

Cleaning agent, preparation method thereof and application thereof in cleaning without stopping machine
Technical Field
The invention relates to a cleaning agent, in particular to a cleaning agent for cleaning a water circulation system without stopping, a preparation method thereof and application thereof in cleaning the water circulation system without stopping.
Background
One common feature of water circulation systems is that water is used as the circulation medium. It is well known that water is generally impure and contains various ions, gases, dust, suspended matter, etc. Due to the existence of the substances, scaling and corrosion hazards can occur when water is used as a circulating medium, and biological slime hazards can be formed due to overgrowth of bacteria and algae.
For example, water is commonly used as a coolant for a central air-conditioning water chilling unit, heat is taken away through circulation and evaporation of cooling water, and a refrigerant is cooled and liquefied; while using water as a coolant, the water is frozen by heat exchange with the coolant and transported to an appropriate place to cool air or other frozen objects. Water as a cooling medium is generally referred to as cooling water, and water as a cooling medium is generally referred to as chilled water.
Due to the existence of the impurities in the water, certain harm is often brought to an air conditioning system, and the main effects are as follows: scaling on the water side of the condenser, slime growing on the cooling tower, corrosion of the evaporator and the chilled water system, and serious influence of the dirt and corrosion products on heat exchange cause reduction of the refrigeration effect of the central air conditioner or disconnection of the high pressure of a compressor of the central air conditioner.
At present, a shutdown cleaning mode, namely shutdown of the central air conditioner and chemical cleaning of a condenser or a chilled water system, is mostly adopted for cleaning the central air conditioner. This method produces a large amount of waste water, and has high corrosion to the air conditioner, high energy consumption, and can be performed only in a state where the central air conditioner stops operating. For some industrial air conditioners used for production, the cleaning is greatly limited and can only be carried out during production maintenance, so that the air conditioner cannot be cleaned in time, and the air conditioner cannot operate in an optimal state, thereby affecting the production efficiency. In addition, when the summer climate is hot, the civil central air conditioner is often required to be cleaned due to the refrigeration problem, and for occasions such as high-grade hotels, hospitals, shopping malls, office buildings and the like, the air conditioner is stopped for 1-2 days due to the cleaning of the central air conditioner, great inconvenience is brought to users and customers, and meanwhile, the reputation of the occasions is seriously influenced.
The scale is generally made of CaCO3、CaSO4、Ca3(PO4)2And CaSiO3And the like. The rust scale generally contains Fe2O3And FeO.
The descaling of the prior art generally uses strongly acidic substances, for example, a typical conventional cleaning solution is composed of:
2-8% of sulfamic acid (or hydrochloric acid) (weight percentage, the same below)
0.2 to 0.5 percent of sodium fluoride (or hydrofluoric acid)
0.3 to 0.5 percent of thiourea
Lan-826 0.3%
Its dissolution of scale and rust is shown below:
(1)
the cleaning agent is mainly used for machine halt descaling and rust removal of a central air-conditioning system, and the main component is strong acid, so that corrosion hazards exist, and the cleaning agent has higher danger particularly to more pipe joints of the air-conditioning system and corroded pipe walls; and as shown in the reaction (1), a large amount of gas is generated during cleaning, and if the gas cannot be effectively discharged, a gas blockage phenomenon occurs, so that the descaling effect is influenced. Meanwhile, the use method of the cleaning agent is complex, the process is difficult to control, and a chilled water system is generally required to be provided with a pipe and is externally connected with a liquid distribution tank and a cleaning pump. Cleaning without stopping the machine cannot be achieved.
Disclosure of Invention
The invention aims to provide a cleaning agent to realize non-stop cleaning of a water circulation system.
The invention also aims to provide a preparation method of the cleaning agent.
It is a further object of the present invention to provide a use of the above cleaning agent in non-stop cleaning of water circulation systems, particularly central air conditioning systems.
Aiming at the problems that the cleaning technology of the central air conditioner is high in requirement, various in material, difficult to operate and control, limited in the operation period of the central air conditioner during the shutdown cleaning in summer and autumn and the like, a novel cleaning agent for a water circulation system is developed. It features that chemical cleaning can be performed without stopping the water circulation system.
The non-stop cleaning refers to that the refrigeration compressor is still in a starting state in the cleaning liquid circulating process, cleaning agent is added into a water system to convert water stored in the system into cleaning liquid, water is slowly softened, dissolved or dispersed into water through the circulating flow of water and low-concentration cleaning agent components, and then the water is discharged out of the system through sewage discharge or water replacement to finish the cleaning and removing of dirt. In the process, the cleaning liquid is used as cooling water or chilled water to circulate in an internal pipeline of the air conditioner.
The invention provides a cleaning agent for a water circulation system, which uses chelating agent and dispersing agent containing hydroxyl, carboxyl, phosphino, sulfonic group and other groups to treat Ca2+、Mg2+、Fe2+、Fe3+The chelation of plasma can make it produce soluble chelate, and the dispersing action of dispersing agent can make a large quantity of dirt components be stably dispersed and suspended in the water in the form of microparticles so as to attain the goal of dissolving and dispersing dirt and cleaning.
The formula of the cleaning agent of the water circulation system comprises the following components:
composition weight percent (%)
10 to 30 parts of chelating agent
5 to 15 parts of a stripping agent
1 to 10 parts of a dispersant
0.1-1% of corrosion inhibitor
Balance of water
The formula comprises the following components: the chelating agent is carboxylic acid substances containing hydroxyl or a mixture thereof, such as: polyepoxysuccinic acid, malic acid, and the like, or mixtures thereof; the stripping agent is a copolymer containing sulfonic acid group, phosphono group, carboxyl group or a mixture thereof, such as: hypophosphorous acid-based polyacrylic acid, acrylic acid itaconic acid copolymer, and the like, or mixtures thereof; the dispersant is polypropylene binary copolymer containing polybasic carboxyl or mixture thereof, such as: acrylic maleic anhydride copolymers, AA/AMPS copolymers, and the like, or mixtures thereof; the corrosion inhibitor is a substance containing zinc salt, quaternary ammonium salt, azole and the like or a mixture thereof.
The preparation method of the cleaning agent comprises the following steps:
according to the proportion of the formula, at normal temperature, the chelating agent, the stripping agent and the dispersing agent are sequentially added into water, uniformly mixed, added with the corrosion inhibitor after the solution is stable and free of bubbles, and stirred or circulated until the liquid is homogeneous, so that the cleaning agent disclosed by the invention can be obtained.
According to a further aspect of the invention, there is provided the use of a cleaningagent according to the invention for cleaning a water circulation system without stopping the water circulation system. The addition amount is 0.8-2.0% of the water retention amount of the system according to the weight percentage.
The invention also provides an application of the cleaning agent in cleaning a central air conditioner without stopping:
the cleaning agent is added into circulating water according to the concentration of 0.8-2.0%, preferably 0.8-1.2% (weight percentage) of the water retention amount of the system, pollution discharge and water supplement are carried out at most once every ten days, preferably once every five to eight days, the pollution discharge amount is 8-20%, preferably 8-15% of the water retention amount of the system, and the agent is supplemented by at least 0.3%, preferably 0.5-3.0% of the pollution discharge amount, and the cleaning can be finished after 15-60 days of operation.
For a system with slight corrosion or scaling, 0.8-2.0% of a medicament can be added at one time, and after the system is operated for 15-30 days, system water is replaced, so that the cleaning process of the product can be completed.
For a system seriously corroded or scaled, the system can be added and operated according to the concentration of 0.8-2.0%, pollution discharge is carried out at most once every eight days, preferably every three-five days, the pollution discharge amount is 10-20% of the water retention amount of the system, meanwhile, a medicament is supplemented according to 0.5-1.0% of the pollution discharge amount, and the system generally needs to be operated for 15-60 days, so that cleaning can be completed.
Index (I)
The corrosion rate of the cleaning agent on various metal materials
Material of Corrosion rate (g/m)2·h) Temperature of Remarks for note
20# carbon steel 2.50 20℃ 15 days
Red copper 0.05
Pure aluminium 0.015
Stainless steel 0.005
The corrosion rate of the alloy to metal materials is less than the specification of HG/T2387-92 (Standard of the department of Processingequipment).
Descaling efficiency of the cleaning agent of the invention
Scale sample FeO Scale deposit Scale mixing
Cleaning agent concentration (%) 0.8 0.8 0.8
Cleaning time (T) >15 >30 >30
Descaling ratio (%) >85 >90 ≥70
The cleaning agent of the invention has the following characteristics:
1. under the condition that the central air conditioner normally operates, the cleaning agent disclosed by the invention is added into a chilled water and cooling water system of the central air conditioner, and descaling, derusting and cleaning are finished on a circulating water system under a non-stop state so as to recover the refrigeration effect of the central air conditioner system.
2. The cleaning agent adopts a high-efficiency chelating agent and a high-molecular dispersing agent, gradually softens and disperses dirt, and finally moves out of a system along with sewage. It is especially suitable for cleaning hard scale and rust scale. Such as: carbonate scale, sulfate scale, iron oxide scale, and the like. The descaling effect is ideal, and the descaling device is suitable for cleaning various scales.
The removal rate of various carbonate scales reaches over 90 percent in 15-30 days; and in 30-50 days, the removal rate of sulfate scale is more than 80%.
3. The formula does not contain strong acid substances, the cleaning atmosphere is 3.5-5, the detergent is safe to central air conditioning equipment and free of corrosion hazard, and the detergent can be kept in system water for a long time to improve the cleaning and descaling effects. The corrosion rate is low, and the corrosion inhibitor has good corrosion inhibition effect on various materials such as copper, carbon steel, aluminum, stainless steel and the like.
4. The cleaning agent has small dosage, all the components in the formula are pollution-free substances, the cleaning agent is easy to degrade in natural environment, and the waste liquid after cleaning can be directly discharged, thereby meeting the requirement of environmental protection.
5. The temperature range of the use is wide (normal temperature-60 ℃).
Detailed Description
The present invention will be described in detail with reference to specific examples, but it should be understood that the scope of the present invention is not limited by the examples.
EXAMPLE 1 preparation of detergent solutions of different compositions
According to the proportion of the following formula, at normal temperature, the chelating agent, the stripping agent and the dispersing agent are sequentially added into water, uniformly mixed, added with the corrosion inhibitor after the solution is stable and free of bubbles, and stirred or circulated until the liquid is homogeneous.
Cleaning agent 1
Composition content
Chelating agent: malic acid 15%
Stripping agent: 8 percent of hypophosphorous acid polyacrylic acid
Dispersing agent: acrylic acid maleic anhydride copolymer 12%
Corrosion inhibitor: ZnSO4·H2O 0.01%
Dodecyl benzyl ammonium bromide 0.35%
0.006% of methylbenzotriazole
Balance of water
Cleaning agent 2
Chelating agent: polyepoxysuccinic acid 22%
Stripping agent: acrylic acid itaconic acid copolymer 7.5%
Dispersing agent: AA/AMPS copolymer 5%
Corrosion inhibitor: ZnSO4·7H2O 0.03%
Octadecyl dimethyl benzyl ammonium bromide 0.5%
Mercaptobenzothiazole 0.004%
Balance of water
Cleaning agent 3
Composition content
Chelating agent: polyepoxysuccinic acid 7.5%
17.5 percent of glyoxylic acid
Stripping agent: 2.5 percent of hypophosphorous acid polyacrylic acid
3 percent of sodium polyacrylate
Dispersing agent: acrylic acid maleic anhydride copolymer 4%
HPAA1.5%
Corrosion inhibitor: LAN826 multipurpose restrainer 0.3%
Balance of water
Example 2 example of cleaning by conventional method
The refrigeration effect of a central air conditioner is reduced in use, and the fact that the system is scaled due to the fact that chilled water is used for hard water for a long time is analyzed, and the fact that the chilled water system is cleaned without stopping is determined.
Cleaning method
1. Overview of the System
Frozen water storage capacity 8m3
Evaporator type plate heat exchanger
System material carbon steel, stainless steel, red copper and cast iron
2. Cleaning process
And under the condition that the system normally operates, cleaning without stopping the machine.
The temperature of the freezing water is 8-12 DEG C
2.1 cleaning with detergent without stopping
The high-level expansion water tank of chilled water is used for adding chemicals (the system water is firstly discharged by 0.5 m)3Then, the medicament is put into the high-level water tank, the blow-off valve is opened, the medicament is injected into the system through the pressure difference, and finally the blow-off valve is closed. ). Adding 64kg of medicament for the first time, continuously operating for 15 days, and discharging sewage once every five days in the period, wherein the discharge capacity of each time is 0.8m3The amount of the tonic is 16 kg.
And detecting the total hardness and the total iron concentrationof the system, and finishing cleaning after the ion concentration is stable.
2.2 Water replacement
After the washing was completed, the air conditioning load was reduced, water replacement was performed, and turbidity was measured until it was less than 20 NTU.
3. Cleaning results
The corrosion rate is 0.970g/m2·h
The descaling rate is more than 90 percent through the pipe disassembly inspection of the water inlet of the fan coil.
Example 3 example of cleaning of a light tarnish system
After a new air conditioner in a certain business center is operated, the system is planned to be pre-filmed and added with water treatment agents, and the whole air conditioner system is cleaned and derusted without stopping the machine in order to ensure the pre-filming effect.
Cleaning method
1. System conditions
Chilled water storage capacity 45m3
Cooling water storage capacity 90m3
2. Cleaning process
And (3) respectively adding 0.675 ton of non-stop cleaning agent into the chilled water system and 0.72 ton of cleaning agent into the cooling water system according to the volume of the systems, continuously operating for 20 days until the iron ion concentrations of the two systems are stable, and finishing cleaning. Then, the air conditioning load is appropriately reduced, water replacement is started, the concentration of iron ions is monitored, and when the concentration of iron ions is less than 20ppm, water replacement is ended, and planned pre-filming and other works can be performed.
3. Cleaning results
Corrosion rate 1.2g/m2·h
The rust removal rate is more than 90 percent.
Example 4 cleaning of severely rusted or fouled systems
A certain heating and refrigerating medium water/hot water system provides refrigerating and heating services for users of a certain railway branch office (a waiting hall of a station, an office complex, a ticketing hall and the like). The system supplies chilled water for air conditioning refrigeration in 4-10 months every year, and supplies hot water for air conditioning heating in 11-4 months in the next year; system water volume 170m3To date, the system has been left unattended for seven years without a full system cleaning and dosing process. Serious scaling occurs in surface coolers and pipelines of air conditioning units, and the refrigeration and heat supply effects of air conditioners in summer and winter are affected. The water system has a plurality of users, and the time and the process operation can not be ensured when the water system is shut down and cleaned in all aspects.
The scaling condition in the system is divided into two types:
one type is as follows: the scale is mainly formed in the surface cooler of the air conditioner and the fan coil, the type of the scale is carbonate, and the thickness of the scale is 1-2 mm.
The other is as follows: the inner wall of the refrigerating water pipeline is a rust and scale mixture, the upper layer is a thin layer of carbonate scale, and the lower layer is a combination of 2mm rust and oil sludge.
Cleaning method
1. Amount of detergent used
2.11 tons of cleaning agent without stopping machine
pH regulator (rinsing liquid) 1.2 ton
2. Cleaning process
Under the condition of normal heat supply of the system, a method of cleaning without stopping the machine is adopted.
System water temperature: about 40 degrees.
2.1 cleaning with cleaning agent without stopping
The cleaning agent is added into the system without stopping through the water replenishing tank.
The initial dosage is 1.36 tons, and after 3 days of operation, the sewage is discharged by 30m3Supplementing water, adding 0.15 ton of medicament, continuously cleaning for 15 days, and discharging sewage every three days in the period, wherein the discharge capacity is 15m3And simultaneously 0.15 ton of medicament is supplemented each time.
And detecting the total hardness and the total iron concentration of the system, and finishing cleaning after the ion concentration is stable.
2.2 Water replacement
The hot water system finishes the heat supply plan and carries out shutdown maintenance.
The cleaning solution is emptied, and new water is added for circulation for 6 hours for washing.
2.3 rinsing (sediment treatment)
And adding a pH regulator into the washing water, regulating the pH of the washing water to 3-4, and rinsing the secondary dirt deposition caused by washing and the fine dirt residues stripped off for 3 hours.
Whether the process is adopted or not is determined according to the cleaning condition of the system.
2.4 Water replacement
After rinsing, the circulation volume of the system is increased, and deposited dirt and stripped fine dirt slag are replaced out of the system through drainage.
Cleaning results
1. Corrosion conditions
The cleaning pH is 5-6 for 18 days
Rinsing pH 3-4 for 3 hours
The corrosion amount of the cleaning liquid and the rinsing liquid to the carbon steel is far less than the national standard: is 1.1g/m2.h
2. Device inspection
The water outlet of the surface cooler of the cold air conditioner is opened for inspection, so that the copper pipe is basically free of scale, the natural color of metal is exposed, and the surface is free of over-washing phenomenon.
The descaling rate reaches more than 95 percent.
From the above examples, we can see that:
1. the cleaning agent has good descaling capacity, and can perform complex cleaning and dispersion on water scale in a neutral atmosphere.
2. The cleaning agent has certain cleaning capacity on rust and scale, and can dissolve and disperse loose rust and scale mixtures in a refrigerant water system by combining a rinsing process.
3. The cleaning result shows that the cleaning agent can realize the descaling, derusting and cleaning of a central air-conditioning refrigerant water system under the non-stop state, meets the cleaning requirement and achieves the purposes of descaling and derusting.
The cleaning agent of the present invention can be used for cleaning a central air conditioner without stopping the machine, and the normal operation of the air conditioner is not affected. The cleaning process operation is simplified; the corrosion rate is low, and the method is suitable for various materials such as carbon steel, copper, aluminum and the like; the descaling and derusting effects reach or approach the effect of shutdown cleaning. The cleaning agent is a simple, practical and safe cleaning agent for a central air-conditioning water system.

Claims (8)

1. A cleaning agent for a water circulation system is characterized by comprising the following components:
the weight percentage of the composition
10 to 30 parts of chelating agent
5 to 15 parts of a stripping agent
1 to 10 parts of a dispersant
0.1-1% of corrosion inhibitor
The balance of water is water,
wherein the chelating agent is polyepoxysuccinic acid, malic acid or a mixture thereof; the stripping agent is hypophosphorous acid polyacrylic acid, acrylic acid itaconic acid copolymer or a mixture thereof; the dispersant is acrylic acid maleic anhydride copolymer, AA/AMPS copolymer or mixture thereof; the corrosion inhibitor is zinc salt, quaternary ammonium salt, azole substance or mixture.
2. A method for preparing the cleaning agent according to claim 1, which comprises the steps of:
adding the chelating agent, the stripping agent and the dispersing agent into water according to the proportion of the formula, uniformly mixing, adding the corrosion inhibitor component after the solution is stable and has no bubbles, and stirring or circulating until the liquid is homogeneous to obtain the cleaning agent.
3. Use of a cleaning agent according to claim 1 for cleaning water circulation systems without stopping the system.
4. The use of the cleaning agent according to claim 1 for cleaning a central air conditioner without stopping the machine.
5. Use according to claim 3 or 4, characterized in that the cleaning process is: the cleaning agent of claim 1 is added into circulating water according to the concentration of 0.8-2.0% of the weight of the water retained by the system, and after the system operates for 15-30 days, the system water is replaced, so that the cleaning process of the product can be completed.
6. Use according to claim 3 or 4, characterized in that the cleaning process is: the cleaning agent of claim 1 is added into circulating water according to the concentration of 0.8-2.0% of the weight of the water retained by the system, sewage is discharged and water is supplemented at most once every ten days, the sewage discharge amount is 8-20% of the weight of the water retained by the system, the cleaning agent is supplemented by 0.3-3.0% of the sewage discharge amount, and the cleaning is completed after 15-60 days of operation.
7. Use according to claim 3 or 4, characterized in that the cleaning process is: the cleaning agent of claim 1 is added and operated according to the concentration of 0.8-2.0% of the weight of the water retained by the system, the pollution discharge is performed at most once every eight days, the pollution discharge amount is 10-20% of the weight of the water retained by the system, meanwhile, the cleaning agent is supplemented according to 0.5-1.0% of the pollution discharge amount, and the cleaning agent is operated for 15-60 days, so that the cleaning can be completed.
8. The application of the cleaning agent as claimed in claim 6, wherein the cleaning agent is added and operated according to the concentration of 0.8% -1.2% of the weight of the water retained by the system, pollution discharge and water supplement are carried out every five to eight days, the pollution discharge amount is 8% -15% of the weight of the water retained by the system, the cleaning agent is supplemented according to the 0.5% -3.0% of the pollution discharge amount, and the cleaning agent is operated for 15-60 days, so that the cleaning can be finished.
CN 03122823 2003-04-24 2003-04-24 Cleanning agent and preparing method, and application in cleaning without stopping engine CN1232627C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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CN1232627C true CN1232627C (en) 2005-12-21

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* Cited by examiner, † Cited by third party
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CN101768746B (en) * 2008-12-31 2011-07-20 中国蓝星(集团)股份有限公司 Cleaning agent special for stainless steel and preparation method and application thereof
CN101608882B (en) * 2009-07-22 2010-12-01 瓮福(集团)有限责任公司 Method for cleaning copper tubes of condenser
CN101985581B (en) * 2010-11-05 2012-08-22 宁波市川宁环保科技有限公司 Sludge stripping aid of circulating cooling water system
CN102162105A (en) * 2011-03-31 2011-08-24 河南省科学院能源研究所有限公司 Boiler pipeline descaling agent and preparation method thereof
CN103130343A (en) * 2011-11-30 2013-06-05 安徽省蓝天化工有限公司 Preparing method of scale and corrosion inhibition dispersing agent used for sea water desalination
CN105296205A (en) * 2015-11-25 2016-02-03 济南昊泽环保科技有限公司 Cleaning agent for mechanical equipment, and preparation method of cleaning agent
CN105602741A (en) * 2015-12-29 2016-05-25 山东英联化学科技有限公司 Environment-friendly sulfate scale cleaning agent
CN105821426A (en) * 2016-05-09 2016-08-03 爱环吴世(苏州)环保有限公司 Cleaning agent suitable for refrigerator heat exchanger
CN106833926B (en) * 2016-11-23 2020-03-20 北京百耐尔防水工程有限公司 Asphalt cleaning agent and preparation method thereof
CN107326377B (en) * 2017-07-26 2019-04-12 无锡市恒利弘实业有限公司 A kind of aqueous rustproof degreasing paraffin removal cleaning agent and its preparation method and application
CN107338446B (en) * 2017-07-26 2019-08-27 无锡市恒利弘实业有限公司 A kind of water base non-phosphor degreaser antirust wax removing agent and its preparation method and application
CN109252174B (en) * 2018-10-31 2020-08-04 三原富生医疗器械有限公司 Rust remover for hemodialysis machine liquid path system and preparation method thereof

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Address after: 101318 Beijing city B District Shunyi District Tianzhu Airport Industrial Zone Anxiang Street No. 5

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