CN108339930B - Water-based release agent applied to aluminum alloy die castings and preparation method thereof - Google Patents
Water-based release agent applied to aluminum alloy die castings and preparation method thereof Download PDFInfo
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- CN108339930B CN108339930B CN201810134438.7A CN201810134438A CN108339930B CN 108339930 B CN108339930 B CN 108339930B CN 201810134438 A CN201810134438 A CN 201810134438A CN 108339930 B CN108339930 B CN 108339930B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
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Abstract
The invention provides a water-based release agent applied to an aluminum alloy die casting, which comprises the following components in percentage by weight: 51.5 to 70.3 percent of water; 0.5 to 1 percent of triethanolamine; 14-25% of silicone oil emulsion; 8-10% of silicon wax emulsion; 7-12% of polyethylene wax emulsion; 0.2 to 0.5 percent of bactericide. The invention also provides a preparation method of the water-based release agent applied to the aluminum alloy die casting. The invention can greatly improve the rate of finished products in the surface post-treatment process, reduce the burden of the cleaning procedure, effectively improve the rate of finished products of surface treatment, reduce the unplanned downtime and obviously reduce the cost; and the stability of the water-based release agent emulsion is maintained, and the emulsion has good compatibility and affinity to other components in a system.
Description
Technical Field
The invention relates to the field of water-based release agents, in particular to a water-based release agent applied to an aluminum alloy die casting and a preparation method thereof.
Background
Aluminum alloy, as a high-quality metal with light weight, high strength and corrosion resistance, is processed into various sections by pressure casting (die casting for short), and is widely applied to various industrial fields. The aluminum alloy material is heated and melted, and is injected into a die cavity under high pressure in a liquid state, and a die ejector is opened and removed in a short time, so that a release agent is sprayed on the surface of the die cavity before injection to ensure the smooth removal of a product.
During die casting, the mold release agent serves three functions: (1) before the molten metal is injected, a release agent is sprayed on the surface of the die to form an isolating film, so that the cavity is prevented from being directly washed by the molten metal; (2) the metal liquid can enter the cavity to ensure that the mold filling is complete; (3) the casting can be easily demoulded after being formed. The die casting release agent with excellent performance meets the following requirements: (1) the lubricating and demolding performance is good, and the demolding agent forms a complete and uniform lubricating film on the metal surface at high temperature; (2) the cooling and heat insulation performance is good, the release agent has the cooling and heat insulation functions, the temperature balance of the die is kept, and the service life is prolonged; (3) the thermal and chemical stability is high, and the release agent has no corrosivity to the die in the using temperature range, does not deposit carbon, enables the die casting to be white and bright, and does not influence the post-coating procedures such as paint spraying, electroplating and the like. Among them, the mold release agent can be classified into an oil-based mold release agent, a water-based mold release agent and a powder mold release agent. The water-based release agent has the advantages of good release property, strong cooling effect, no pollution, smooth casting surface, few air holes, contribution to automatic operation and the like.
The basic components of the water-based mold release agent are base oil, an emulsifier and water. The silicone release agent using silicone oil as base oil has the advantages of stable performance, excellent release performance, high cost performance and no toxicity, and is the most suitable release agent. The high-quality release agent can help the die casting to be taken out from the die smoothly, reduces the abrasion between the casting and the die cavity, and can also adjust the temperature of each part of the die, thereby prolonging the service life of the die and ensuring the quality of the die casting. The organic matter has poor thermal stability, is easy to generate carbonization scaling phenomenon, and influences the appearance of the product and the service life of the die. The 3C shell part has high requirements on surface treatment, the die casting has good surface finish, the corresponding release agent is required not to corrode a die and a workpiece, and the adaptability to subsequent procedures is good.
On the premise of ensuring that dilution water, alloy components, a die casting process and die surface treatment are correct, the influence of the release agent on the appearance of a die casting piece plays a determining role. The silicone oil has good heat resistance and demolding performance, but has poor coating performance and good film forming performance of the organic wax, and carbon deposition is easily generated on the surface of a mold at high temperature. The die castings and the dies need to be manually cleaned or carbon deposition is removed and the appearance is improved through procedures of cleaning, shot blasting and the like. The silicone wax combines the forming action of the organic wax and the spreadability of the silicone, and is suitable for use in applications requiring lubrication.
The existing water-based release agent takes water as a carrier, base oil is uniformly dispersed in a water phase by an emulsifier in the form of extremely fine particles, and the existing water-based release agent is prepared by compounding various additives such as an extreme pressure additive, a bactericide, an antirust agent and the like, wherein the release performance of some additives can be greatly different due to slight change of the additives, and the cost and the price can be greatly changed. The economic release agent can generally meet the release requirement, and organic matter residues on the surface of a die casting often turn yellow and black, and carbon deposition influences the gloss and the attractiveness of a finished product.
Disclosure of Invention
In view of the above, the invention provides a water-based release agent applied to an aluminum alloy die casting and a preparation method thereof, wherein the water-based release agent can reduce the burden of a cleaning process and reduce the cost.
To this end, in one aspect, the invention provides a water-based release agent applied to an aluminum alloy die casting, which comprises the following components in percentage by weight:
further, the water-based release agent applied to the aluminum alloy die casting comprises the following components in percentage by weight: 60-66% of water; 0.5 to 0.8 percent of triethanolamine; 17-20% of silicone oil emulsion; 8-9% of silicon wax emulsion; 8-10% of polyethylene wax emulsion; 0.2 to 0.5 percent of bactericide.
Further, the water-based release agent applied to the aluminum alloy die casting comprises the following components in percentage by weight: 63% of water; 0.7 percent of triethanolamine; 18% of silicone oil emulsion; 9% of silicon wax emulsion; 9% of polyethylene wax emulsion; 0.3 percent of bactericide.
Further, the water-based release agent applied to the aluminum alloy die casting comprises the following components in percentage by weight: 51.5 percent of water; 1% of triethanolamine; 25% of silicone oil emulsion; 10% of silicon wax emulsion; 12% of polyethylene wax emulsion; 0.5 percent of bactericide.
Further, the water-based release agent applied to the aluminum alloy die casting comprises the following components in percentage by weight: 70.3 percent of water; 0.5 percent of triethanolamine; 14% of silicone oil emulsion; 8% of silicon wax emulsion; 7% of polyethylene wax emulsion; 0.2 percent of bactericide.
Further, the silicone oil emulsion is a Michael silicone oil emulsion 334-50.
Further, the silicone wax emulsion is wacke silicone wax emulsion WACKER E32.
Further, the polyethylene wax emulsion is a basf polyethylene wax emulsion WE-7.
Further, the bactericide is BIT-20 bactericide.
In another aspect, the invention provides a preparation method of a water-based release agent applied to an aluminum alloy die casting, which comprises the following steps:
1) preparing a preparation material of the aluminum alloy water-based die-casting release agent according to the proportion;
2) adding triethanolamine and 40% of water into a container, and sequentially adding a silicone oil emulsion, a silicone wax emulsion and a polyethylene wax emulsion under a stirring state;
3) and adding 60% of water and the bactericide after stirring, and uniformly stirring to obtain a finished product.
Compared with the prior art, the water-based release agent applied to the aluminum alloy die casting and the preparation method thereof provided by the invention have the following advantages:
1) the method can greatly improve the yield in the surface post-treatment process, reduce the burden of a cleaning procedure, effectively improve the yield of the surface treatment, reduce the unplanned downtime and obviously reduce the cost;
2) the wetting, dispersing and solubilizing functions of the emulsifier maintain the stability of the water-based release agent emulsion, and have good compatibility and affinity to other components in a system.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below. While exemplary embodiments of the present disclosure have been shown, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The first embodiment is as follows:
adding water 51.5%, triethanolamine 1%, Mitigo silicone oil emulsion 334-5025%, Wacke silicone wax emulsion WACKERE 3210%, Pasteur polyethylene wax emulsion WE-712%, and BIT-20 bactericide 0.5%.
The preparation process comprises the following steps: adding triethanolamine and part of water into a clean container, sequentially adding 334-50% of Mylar silicone oil emulsion, WACKER E32 of Wacker silicone wax emulsion and WE-712% of Bassfet polyethylene wax emulsion under high-speed stirring, adding the rest water and BIT-20 bactericide after continuously stirring for a period of time, and uniformly stirring at low speed to obtain white, uniform and fine emulsion finished product, and non-layering after centrifugal standing.
Wherein water is used as a solvent; triethanolamine is used as an antirust agent; the Mylar silicone oil emulsion 334-50 plays a role in demoulding and lubricating; the wacke silicon wax emulsion WACKER E32 plays a role in lubrication, auxiliary demoulding and improvement of emulsion stability; the Basf polyethylene wax emulsion WE-7 has the functions of film formation, auxiliary demoulding and emulsion stability improvement.
The silicone oil has good heat resistance and demoulding property, poor coating property and high price; the low-temperature adhesive spreadability of the polyethylene wax is good, easy to deposit and high in price; the synthetic ester has good high-temperature stability, less carbon residue, excellent lubricating property, extremely low toxicity, good high-temperature adhesion and spreadability, high price and difficult emulsification. The release agent has all functions, is environment-friendly and cost-effective, and is prepared by mixing the silicone oil emulsion, the polyethylene wax emulsion and the silicone wax emulsion according to a certain proportion.
The silicone wax emulsion combines the advantages of organic silicon and organic wax, enhances the demolding and lubricating capabilities, and simultaneously improves the appearance of a die casting.
Example two:
the other parts are the same as the first embodiment, except that the mixture ratio: 70.3 percent of water, 0.5 percent of triethanolamine, 334 to 5014 percent of Mitigo silicone oil emulsion, 328 percent of Wacke silicone wax emulsion WACKER E, 77 percent of Pasteur polyethylene wax emulsion WE and 0.2 percent of BIT-20 bactericide are added.
Example three:
the other parts are the same as the first embodiment, except that the mixture ratio: adding water 63%, triethanolamine 0.7%, Mitigo silicone oil emulsion 334-5018%, Wacke silicone wax emulsion WACKER E329%, Pasteur polyethylene wax emulsion WE-79%, and BIT-20 bactericide 0.3%.
Example four:
the other parts are the same as the first embodiment, except that the mixture ratio: 60 percent of water, 0.8 percent of triethanolamine, 334 to 5020 percent of Mitigo silicone oil emulsion, wacke silicone wax emulsion WACKER E329 percent, WE to 710 percent of basf polyethylene wax emulsion and 0.2 percent of BIT-20 bactericide are added.
Example five:
the other parts are the same as the first embodiment, except that the mixture ratio: 66 percent of water, 0.5 percent of triethanolamine, 334 to 5017 percent of Mitigo silicone oil emulsion, 328 percent of Wacke silicone wax emulsion WACKER E, 78 percent of Pasteur polyethylene wax emulsion WE and 0.5 percent of BIT-20 bactericide.
The experimental data for examples 1-5 and comparative example (prior art) are compared as shown in the following table:
from the above comparison, it can be seen that examples 1 to 5 are improved in all of the indices of pH, stability at room temperature, shear stability, centrifugal stability and thermal stability as compared with the comparative example (prior art).
The embodiment is particularly applied to an aluminum alloy mobile phone shell 1:80 (ADC12, 250T powerful die casting machine, mold temperature 260 ℃), and has the advantages of good demolding, complete casting without defects, white, bright and smooth surface, no oil lines, no influence on subsequent processes such as paint spraying, electroplating and the like.
Therefore, compared with the prior art, the water-based release agent applied to the aluminum alloy die casting and the preparation method thereof provided by the embodiment have the following advantages:
1) the silicone wax emulsion is added into the product, so that the yield in the surface post-treatment process can be greatly improved, the burden of a cleaning procedure is reduced, the yield of the surface treatment is effectively improved, the unplanned downtime is reduced, and the cost is obviously reduced for a client;
2) the wetting, dispersing and solubilizing actions of the emulsifier maintain the stability of the water-based release agent emulsion; the determination of the type and the dosage of the emulsifier and the optimal emulsification process conditions is difficult to master, so that most emulsification effects are difficult to reach satisfactory degree. WACKER E32 is a nonionic siloxane wax emulsion with solid content of 40%, has uniform particle size and high stability, and has good compatibility and affinity to other components in the system.
Wherein the stability of the release agent is defined as follows:
stability at room temperature: standing the prepared release agent at room temperature, and observing whether a layering phenomenon exists or not;
shear stability: diluting the emulsion by 80 times, and stirring with a high-speed stirrer for 10min without emulsion breaking, layering and precipitation;
centrifugal stability: diluting the emulsion by 80 times, and centrifuging at 3000r/min for 15min without demulsification, delamination and precipitation;
thermal stability: the emulsion was heated in a test tube and boiled for 10min, if the emulsion was stable without any change.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (2)
1. A preparation method of a water-based release agent applied to an aluminum alloy die casting is characterized by comprising the following steps:
1) preparing a preparation material of the aluminum alloy water-based die-casting release agent according to the following mixture ratio: 60-66% of water; 0.5 to 0.8 percent of triethanolamine; 17-20% of silicone oil emulsion; 8-9% of silicon wax emulsion; 8-10% of polyethylene wax emulsion; 0.2 to 0.5 percent of bactericide;
2) adding triethanolamine and 40% of water into a container, and sequentially adding a silicone oil emulsion, a silicone wax emulsion and a polyethylene wax emulsion under a stirring state;
3) after stirring, adding 60% of water and a bactericide, and uniformly stirring to obtain a finished product;
the silicone oil emulsion is a Michael silicone oil emulsion 334-50; the silicon wax emulsion is Wacke silicon wax emulsion WACKER E32; the polyethylene wax emulsion is a basf polyethylene wax emulsion WE-7; the bactericide is a BIT-20 bactericide.
2. The preparation method of the water-based release agent applied to the aluminum alloy die castings according to the claim 1, characterized in that the mixture ratio in the step 1) is as follows: 63% of water; 0.7 percent of triethanolamine; 18% of silicone oil emulsion; 9% of silicon wax emulsion; 9% of polyethylene wax emulsion; 0.3 percent of bactericide.
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| IT202100032024A1 (en) * | 2021-12-21 | 2023-06-21 | Maurizio Sala | Process of preparing a release agent for die casting. |
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| CN109014023B (en) * | 2018-08-29 | 2020-07-10 | 昆山帝邦铸造科技有限公司 | Water-based release agent and preparation method and use method thereof |
| CN109434010A (en) * | 2018-12-14 | 2019-03-08 | 上海樱花化研化工科技有限公司 | A kind of aluminum alloy mould release agent composition and preparation method thereof |
| CN111360195A (en) * | 2020-04-02 | 2020-07-03 | 佛山市三水区正田金属制品有限公司 | High-temperature-resistant mold release agent |
| CN113134566B (en) * | 2021-04-28 | 2023-05-12 | 奎克化学（中国）有限公司 | Die-casting release agent for aluminum alloy structural part |
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| CN101260236A (en) * | 2007-03-07 | 2008-09-10 | 上海诺科生物科技有限公司 | Silicon wax emulsion for polyurethane water release agent |
| CN101628458B (en) * | 2009-04-07 | 2011-07-20 | 上海立汰新模具材料有限公司 | Polyurethane water-based release agent and application thereof |
| CN101898227A (en) * | 2010-07-28 | 2010-12-01 | 启东尤希路化学工业有限公司 | Environmental-friendly magnesium alloy mold releasing agent |
| CN102658351B (en) * | 2012-05-02 | 2013-10-09 | 厦门大学 | Fluorine-free aluminum zinc alloy water base release agent and preparation method thereof |
| CN103831393B (en) * | 2013-12-30 | 2016-05-25 | 上海福岛新材料科技有限公司 | A kind of water-based aluminium alloy compression casting releasing agent and preparation method thereof |
| CN105689638B (en) * | 2016-04-18 | 2018-03-27 | 苏州兴业材料科技股份有限公司 | A kind of water base aluminium alloy compression casting releasing agent and preparation method thereof |
| CN107384562B (en) * | 2017-07-04 | 2020-05-05 | 富兰克润滑科技（太仓）有限公司 | Aluminum alloy water-based die-casting release agent and preparation method thereof |
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| IT202100032024A1 (en) * | 2021-12-21 | 2023-06-21 | Maurizio Sala | Process of preparing a release agent for die casting. |
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