CN110670080A - Low-temperature alkaline degreasing agent for aluminum and aluminum alloy and preparation method thereof - Google Patents
Low-temperature alkaline degreasing agent for aluminum and aluminum alloy and preparation method thereof Download PDFInfo
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- CN110670080A CN110670080A CN201910874876.1A CN201910874876A CN110670080A CN 110670080 A CN110670080 A CN 110670080A CN 201910874876 A CN201910874876 A CN 201910874876A CN 110670080 A CN110670080 A CN 110670080A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/22—Light metals
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- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
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Abstract
The invention discloses a low-temperature alkaline degreasing agent for aluminum and aluminum alloy, which comprises the following components in percentage by weight: 20-35% of sodium methylsilicate, 5-10% of sodium carbonate, 1-5% of trimethyl metasilicate, 1-2% of sodium dodecyl sulfate, 3-5% of tetrasodium ethylene diamine tetraacetate, 2-8% of sodium silicate, 1-2% of polyethylene glycol, 0.5-1.5% of demulsifier, 0.05-0.1% of rust remover, 1-3% of wax remover and the balance of water. The aluminum and aluminum alloy treated by the medium-low temperature degreasing agent has good surface cleanliness and high glossiness, and is beneficial to improving the effect of subsequent surface treatment. The invention also discloses a preparation method of the medium-low temperature alkaline degreasing agent, which has simple steps, is nontoxic and pollution-free and is beneficial to large-scale industrial production.
Description
Technical Field
The invention relates to the technical field of aluminum and aluminum alloy surface treatment, in particular to an alkaline degreasing agent for aluminum and aluminum alloy.
Background
With the development of aluminum smelting and processing technology, aluminum products are widely applied to aviation, building materials, vehicles, ships, light industry and other departments. For light industrial products, products oxidized by applying automatic equipment and strict processes are subjected to decorative treatment such as offset printing, thermal transfer printing coloring, electrophoretic painting and the like, so that the products have very attractive and delicate appearance. With the continuous improvement of the living standard of people, the aluminum products still can not meet the living requirements of people far away, and particularly, compared with similar products abroad, the difference between the aluminum products and the like is large in quality and fancy varieties, which shows that the processing and surface treatment technology of the aluminum products in China is relatively laggard. In recent years, some new processes and new technologies are tested and adopted through frequent scientific and technological communication at home and abroad and the efforts of scientific and technological workers, but in general, the aspect of the surface treatment technology of aluminum products in China is still in the development period to be developed.
Because the traditional aluminum and aluminum alloy must be subjected to oil removal cleaning (sometimes the glossiness needs to be increased) before oxidation or spraying, an acid oil removal bright cleaning process is generally adopted, however, the traditional acid oil removal bright cleaning agent contains a large amount of fluorine and phosphorus, which is harmful to human bodies and seriously pollutes the environment, and acid water generated in the acid oil removal process causes great burden on the aspect of wastewater treatment, so that the traditional acid oil removal and bright cleaning process is increasingly limited to be used, the more environment-friendly alkaline oil removal cleaning agent becomes a hotspot of enterprise research, and the alkaline oil removal process becomes a future development direction in the aspects of oil removal brightening and bright cleaning of the surfaces of the aluminum and aluminum alloy.
At present, part of aluminum products are subjected to oil removal treatment in alkaline solution, however, the aluminum products after the treatment of the alkaline solution need to be neutralized by acidic liquid, so that the manufacturing process steps of the aluminum products are increased, the manufacturing cost of the process is also increased, the simple oil removal treatment function of the alkaline solution is single, rust removal, wax removal and brightening cannot be effectively performed, and the use has limitation.
Disclosure of Invention
The invention aims to provide a low-temperature alkaline degreasing agent for aluminum and aluminum alloy and a preparation method thereof aiming at the defects of the technology.
The technical scheme adopted by the invention is as follows: the low-temperature alkaline degreasing agent for aluminum and aluminum alloy comprises the following components in percentage by weight: 20-35% of sodium methylsilicate, 5-10% of sodium carbonate, 1-5% of trimethyl metasilicate, 1-2% of sodium dodecyl sulfate, 3-5% of tetrasodium ethylene diamine tetraacetate, 2-8% of sodium silicate, 1-2% of polyethylene glycol, 0.5-1.5% of demulsifier, 0.05-0.1% of rust remover, 1-3% of wax remover and the balance of water.
The invention compounds the methyl sodium silicate, the trimethyl metasilicate and the sodium carbonate to be used as an alkaline compound system which reacts with the aluminum and the aluminum alloy, wherein the methyl sodium silicate and the trimethyl metasilicate play a main role, and the sodium carbonate plays an auxiliary role, so that obvious visible bubbles can be generated on the surfaces of the aluminum and the aluminum alloy, and the bubbles are generated slowly and mildly, thereby obtaining the surface treatment effect of more thorough oil removal and higher glossiness. The sodium dodecyl sulfate and the tetrasodium ethylene diamine tetraacetate in the invention are used as the surfactants, and can wet the surfaces of the aluminum and the aluminum alloy during the alkaline oil removal reaction of the aluminum and the aluminum alloy, so that the surfaces of the aluminum and the aluminum alloy are smoother, and the defects of producing corrosion stains, flow marks and the like are not easy to generate. The sodium silicate of the invention belongs to a metal corrosion inhibitor with a protection effect on the surfaces of aluminum and aluminum alloy, and is a non-toxic raw material, so that toxic metal elements are prevented from being introduced, and the processing environmental protection performance of the oil removal cleaning agent is greatly improved. The wax remover and the demulsifier have synergistic effect, can simultaneously destroy and decompose oil wax substances, water-soluble grease and oil-soluble grease on the surface of a workpiece to be degreased and cleaned, and efficiently remove various oil stains and oil waxes on the surface through demulsification precipitation, thereby increasing the cleaning effect of the oil remover. In fact, the existing alkaline degreasing agent has single function, and certain technical difficulty exists in compounding of various functional raw materials. Meanwhile, the alkaline degreasing agent has the functions of degreasing, derusting and dewaxing
As a further improvement of the scheme, the wax remover consists of coconut diethanolamide and oleic triethanolamine soap according to the weight ratio of 1: 1. Particularly, the wax remover has good dispersion performance with other raw material components, and further improves the stability of the oil removing cleaning agent.
As a further improvement of the above aspect, the demulsifier is selected from an AE-type demulsifier or an AR-type demulsifier. Particularly, the demulsifier has good dispersion performance with other raw material components, and further improves the stability of the oil removal detergent.
As a further improvement of the scheme, the rust remover is sodium hydroxide. Specifically, the sodium hydroxide not only has an efficient rust removal effect, but also has an effect of adjusting the pH of the alkaline degreasing agent. Therefore, the addition amount of the rust remover is very important.
The preparation method of the low-temperature alkaline degreasing agent in the aluminum and the aluminum alloy comprises the following process steps: uniformly mixing sodium methyl silicate, trimethyl metasilicate, a paraffin remover and water, adding sodium carbonate, ethylene diamine tetraacetic acid tetrasodium and sodium silicate once under the stirring condition, heating to 35-50 ℃, sequentially adding sodium dodecyl sulfate, polyethylene glycol, a demulsifier and a rust remover, and uniformly stirring to obtain a finished product.
The invention has the beneficial effects that:
the multifunctional acid degreasing agent is compounded by active ingredients with multiple functions, is more environment-friendly than the traditional acid degreasing agent, is more complete and more efficient than the existing medium-low temperature alkaline degreasing agent, greatly simplifies the pretreatment steps of aluminum and aluminum alloy, can be subjected to subsequent treatment by only adopting a simple water washing procedure after the medium-low temperature alkaline degreasing agent is used for treatment, and is good in surface cleanliness and high in glossiness, so that the effect of the subsequent surface treatment is favorably improved.
The preparation method of the invention has simple steps, no toxicity and no pollution, and is beneficial to large-scale industrial production.
Detailed Description
The present invention is specifically described below with reference to examples in order to facilitate understanding of the present invention by those skilled in the art. It should be particularly noted that the examples are given solely for the purpose of illustration and are not to be construed as limitations on the scope of the invention, as non-essential improvements and modifications to the invention may occur to those skilled in the art, which fall within the scope of the invention as defined by the appended claims. Meanwhile, the raw materials mentioned below are not specified in detail and are all commercial products; the process steps or preparation methods not mentioned in detail are all process steps or preparation methods known to the person skilled in the art.
Example 1
The low-temperature alkaline degreasing agent for aluminum and aluminum alloy comprises the following components in percentage by weight: 20% of methyl sodium silicate, 10% of sodium carbonate, 1% of trimethyl metasilicate, 2% of sodium dodecyl sulfate, 3% of ethylene diamine tetraacetic acid tetrasodium salt, 8% of sodium silicate, 1% of polyethylene glycol, 0.5% of AE type demulsifier, 0.1% of sodium hydroxide, 0.5% of coconut oleic acid diethanolamide, 0.5% of oleic acid triethanolamine soap and the balance of water.
The preparation method comprises the following steps: uniformly mixing sodium methyl silicate, trimethyl metasilicate, coconut diethanolamide, triethanolamine oleate soap and water, adding sodium carbonate, ethylene diamine tetraacetic acid tetrasodium salt and sodium silicate once under the stirring condition, heating to 35-50 ℃, sequentially adding sodium dodecyl sulfate, polyethylene glycol, an AE type demulsifier and sodium hydroxide, and uniformly stirring to obtain the finished product of the example 1.
Example 2
The low-temperature alkaline degreasing agent for aluminum and aluminum alloy comprises the following components in percentage by weight: 35% of methyl sodium silicate, 5% of sodium carbonate, 5% of trimethyl metasilicate, 1% of sodium dodecyl sulfate, 5% of ethylene diamine tetraacetic acid tetrasodium, 2% of sodium silicate, 2% of polyethylene glycol, 1.5% of AR type demulsifier, 0.05% of sodium hydroxide, 1.5% of coconut oleic acid diethanolamide, 1.5% of oleic acid triethanolamine soap and the balance of water.
The preparation method comprises the following steps: uniformly mixing sodium methyl silicate, trimethyl metasilicate, coconut diethanolamide, triethanolamine oleate soap and water, adding sodium carbonate, ethylene diamine tetraacetic acid tetrasodium salt and sodium silicate once under the stirring condition, heating to 35-50 ℃, sequentially adding sodium dodecyl sulfate, polyethylene glycol, an AR type demulsifier and sodium hydroxide, and uniformly stirring to obtain the finished product of the example 2.
Example 3
The low-temperature alkaline degreasing agent for aluminum and aluminum alloy comprises the following components in percentage by weight: 30% of methyl sodium silicate, 8% of sodium carbonate, 3% of trimethyl metasilicate, 1.5% of sodium dodecyl sulfate, 4% of ethylene diamine tetraacetic acid tetrasodium salt, 5% of sodium silicate, 1.5% of polyethylene glycol, 1% of AE type demulsifier, 0.08% of sodium hydroxide, 1% of coconut oleic acid diethanolamide, 1% of oleic acid triethanolamine soap and the balance of water.
The preparation method comprises the following steps: uniformly mixing sodium methyl silicate, trimethyl metasilicate, coconut diethanolamide, triethanolamine oleate soap and water, adding sodium carbonate, ethylene diamine tetraacetic acid tetrasodium salt and sodium silicate once under the stirring condition, heating to 35-50 ℃, sequentially adding sodium dodecyl sulfate, polyethylene glycol, an AE type demulsifier and sodium hydroxide, and uniformly stirring to obtain the finished product of the example 3.
Example 4
The low-temperature alkaline degreasing agent for aluminum and aluminum alloy comprises the following components in percentage by weight: 25% of sodium methyl silicate, 7% of sodium carbonate, 2% of trimethyl metasilicate, 2% of sodium dodecyl sulfate, 5% of ethylene diamine tetraacetic acid tetrasodium, 3% of sodium silicate, 1% of polyethylene glycol, 0.5% of AR type demulsifier, 0.07% of sodium hydroxide, 1.2% of coconut oleic acid diethanolamide, 1.2% of oleic acid triethanolamine soap and the balance of water.
The preparation method comprises the following steps: uniformly mixing sodium methyl silicate, trimethyl metasilicate, coconut diethanolamide, triethanolamine oleate soap and water, adding sodium carbonate, ethylene diamine tetraacetic acid tetrasodium salt and sodium silicate once under the stirring condition, heating to 35-50 ℃, sequentially adding sodium dodecyl sulfate, polyethylene glycol, an AR type demulsifier and sodium hydroxide, and uniformly stirring to obtain the finished product of the example 4.
Example 5: performance detection
Respectively carrying out surface treatment on the aluminum profile samples by using the finished products obtained in the above embodiments 1-4, wherein the process conditions are as follows: the finished products obtained in the examples 1 to 4 and tap water are prepared into bath solution, the concentration of the alkaline degreasing agent in the bath solution is 50g/L, the working temperature of the bath solution is controlled to be 25 ℃ in the degreasing treatment process, the working time is 5min, and the effects after treatment are shown in the following table 1. Wherein the gloss was measured with a gloss meter and the remaining items were visually observed.
TABLE 1 aluminium profile sample treatment effect
The above embodiments are preferred embodiments of the present invention, and all similar processes and equivalent variations to those of the present invention should fall within the scope of the present invention.
Claims (5)
1. The medium-low temperature alkaline degreasing agent for aluminum and aluminum alloy is characterized by comprising the following components in percentage by weight: 20-35% of sodium methylsilicate, 5-10% of sodium carbonate, 1-5% of trimethyl metasilicate, 1-2% of sodium dodecyl sulfate, 3-5% of tetrasodium ethylene diamine tetraacetate, 2-8% of sodium silicate, 1-2% of polyethylene glycol, 0.5-1.5% of demulsifier, 0.05-0.1% of rust remover, 1-3% of wax remover and the balance of water.
2. The low-temperature alkaline degreasing agent for aluminum and aluminum alloys as claimed in claim 1, wherein the degreasing agent comprises the following components: the wax remover consists of coconut diethanolamide and oleic triethanolamine soap in the weight ratio of 1 to 1.
3. The low-temperature alkaline degreasing agent for aluminum and aluminum alloys as claimed in claim 1, wherein the degreasing agent comprises the following components: the demulsifier is selected from AE type demulsifier or AR type demulsifier.
4. The low-temperature alkaline degreasing agent for aluminum and aluminum alloys as claimed in claim 1, wherein the degreasing agent comprises the following components: the rust remover is sodium hydroxide.
5. A method for preparing the low-temperature alkaline degreasing agent in the aluminum and the aluminum alloy according to any one of claims 1 to 4, which is characterized by comprising the following process steps: uniformly mixing sodium methyl silicate, trimethyl metasilicate, a paraffin remover and water, adding sodium carbonate, ethylene diamine tetraacetic acid tetrasodium and sodium silicate once under the stirring condition, heating to 35-50 ℃, sequentially adding sodium dodecyl sulfate, polyethylene glycol, a demulsifier and a rust remover, and uniformly stirring to obtain a finished product.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111234965A (en) * | 2020-01-15 | 2020-06-05 | 东莞市四辉表面处理科技有限公司 | Novel oleic soap for efficient industrial wax removal and preparation method thereof |
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| CN106048569A (en) * | 2016-06-12 | 2016-10-26 | 含山县朝霞铸造有限公司 | Surface treatment method for aluminum alloy die casting and product thereof |
| CN109023397A (en) * | 2018-10-09 | 2018-12-18 | 佛山市海化表面处理科技有限公司 | Low-temperature alkali degreaser and its preparation, application method in a kind of four-in-one |
| CN109234723A (en) * | 2018-10-11 | 2019-01-18 | 浙江元美铝业科技有限公司 | A kind of environment-friendly type aluminum alloy die casting process of surface treatment and treatment agent formula |
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- 2019-09-17 CN CN201910874876.1A patent/CN110670080A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106048569A (en) * | 2016-06-12 | 2016-10-26 | 含山县朝霞铸造有限公司 | Surface treatment method for aluminum alloy die casting and product thereof |
| CN109023397A (en) * | 2018-10-09 | 2018-12-18 | 佛山市海化表面处理科技有限公司 | Low-temperature alkali degreaser and its preparation, application method in a kind of four-in-one |
| CN109234723A (en) * | 2018-10-11 | 2019-01-18 | 浙江元美铝业科技有限公司 | A kind of environment-friendly type aluminum alloy die casting process of surface treatment and treatment agent formula |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111234965A (en) * | 2020-01-15 | 2020-06-05 | 东莞市四辉表面处理科技有限公司 | Novel oleic soap for efficient industrial wax removal and preparation method thereof |
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