CN113245505A - Aluminum die-casting water-based mold release agent suitable for fluoride-free refrigeration industry - Google Patents
Aluminum die-casting water-based mold release agent suitable for fluoride-free refrigeration industry Download PDFInfo
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- CN113245505A CN113245505A CN202110514817.0A CN202110514817A CN113245505A CN 113245505 A CN113245505 A CN 113245505A CN 202110514817 A CN202110514817 A CN 202110514817A CN 113245505 A CN113245505 A CN 113245505A
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- stirring
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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
Abstract
The invention relates to the technical field of aluminum die-casting release agents, and particularly discloses an aluminum die-casting water-based release agent suitable for the fluorine-free refrigeration industry, which comprises the following raw materials, by weight, 1-10% of a non-ionic surfactant, 5-30% of long-chain alkyl modified silicone oil, 0-15% of high-molecular polyester, 1-15% of high-molecular wax, 0-3% of a silicon-containing high-temperature-resistant compound, and the balance of water; the long-chain alkyl modified silicone oil used in the invention can improve the extreme pressure lubricity of common silicone oil, has good adsorbability and excellent lubricity on metal materials, and particularly has good lubricating effect on aluminum materials with poor lubricity, and the high-molecular polyester and the high-molecular wax can respectively provide lubricating action at low temperature and high temperature, so that the release agent has excellent lubricating property in high-temperature environment.
Description
Technical Field
The invention relates to the technical field of aluminum die-casting release agents, in particular to an aluminum die-casting water-based release agent suitable for the fluorine-free refrigeration industry.
Background
The release agent is an interfacial coating applied to the surfaces of two objects that are easily adhered to each other, which allows the surfaces of the objects to be easily released, smooth and clean. The release agent can play a role in lubricating at high temperature, can avoid the scouring effect of molten metal on the surface of a cavity, improves the working condition of a mold, prevents sticking of the mold, reduces the heat conductivity and the mold temperature of the mold, adjusts the temperature of each part of the mold to be relatively stable, thereby improving the formability, and a formed film can reduce the friction and the abrasion between a casting and the mold cavity, particularly a mold core, and prolongs the service life of the mold.
The metal die casting release agent is mainly used for various die pressing operations of metal materials such as aluminum alloy, magnesium alloy, zinc alloy and the like. In molding, the metal die casting release agent should have a high tensile strength, heat and stress resistance, and be not easily decomposed or abraded.
The existing domestic release agent generally has the problems of common release effect, poor stability, poor high-temperature resistance, easy formation of carbon deposition and the like. Meanwhile, the oil-based release agent also has the problems of poor cooling effect, poor safety caused by self-combustion, harmful smoke generated in the using process, easy generation of air holes in die casting and the like. The water-based release agent takes water as a dispersion medium, has a cooling effect superior to that of an oil-based release agent, is non-flammable, does not generate harmful smoke in the process of using the water-based release agent, and is more and more widely applied in the die-casting industry.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the aluminum die-casting water-based mold release agent suitable for the fluorine-free refrigeration industry, the design scheme has the advantages of good mold release property, strong cooling effect, strong stability and wide applicable temperature range, and the problems of common mold release effect, poor stability and small applicable temperature range of the existing mold release agent are solved.
The invention relates to an aluminum die casting water-based mold release agent suitable for the fluorine-free refrigeration industry, which comprises the following raw materials, by weight, 1-10% of a non-ionic surfactant, 5-30% of long-chain alkyl modified silicone oil, 0-15% of high-molecular polyester, 1-15% of high-molecular wax, 0-3% of a silicon-containing high-temperature-resistant compound, and the balance of water.
As a further improvement of the invention, the nonionic surfactant is one or a combination of more of isomeric alcohol polyoxyethylene ether, nonylphenol polyoxyethylene ether and octylphenol polyoxyethylene ether.
Through the design of the technical scheme, the emulsifier mainly plays a role in emulsifying and improving the stability of the product.
As a further improvement of the invention, the long-chain alkyl modified silicone oil is one or a combination of long-chain alkyl aryl silicone oil, dodecyl methyl silicone oil and octadecyl methyl silicone oil.
Through the design of the technical scheme, the demolding function is mainly realized.
As a further improvement of the invention, the high molecular polyester is one or a combination of a plurality of materials selected from the group consisting of poly palmitate, polyricinoleate and polyglycerol oleate.
Through the design of the technical scheme, the lubricating oil mainly plays a role in low-temperature lubrication.
As a further improvement of the invention, the high molecular wax is one or a combination of a plurality of polyethylene wax emulsion, polypropylene wax emulsion and oxidized polyethylene wax emulsion.
Through the design of the technical scheme, the high-temperature lubricating and isolating device mainly plays a role in high-temperature lubricating and isolating.
As a further improvement of the invention, the silicon-containing high-temperature resistant compound is one or a combination of nano-scale silicon dioxide and methyl phenyl organic silicon resin emulsion.
Through the design of the technical scheme, the device mainly plays a role in effective isolation.
In order to achieve the above purpose, the preparation method comprises the following steps:
step (1), putting a nonionic surfactant and long-chain alkyl modified silicone oil into a stirrer in proportion, mixing and stirring for reaction for 20 minutes, controlling the reaction temperature inside the stirrer, and stirring at the speed of 200 revolutions per minute;
continuously adding the high molecular polyester into the stirrer according to the proportion, stirring and reacting for 30 minutes at normal temperature and at the stirring speed of 200 revolutions per minute;
step (3), slowly adding a proper amount of water in the stirring process, and continuously stirring and reacting for 30 minutes after the water is added, wherein the reaction temperature is normal temperature, and the stirring speed is 500 revolutions per minute;
step (4), slowly adding a proper amount of water in the stirring process, and continuously stirring and reacting for 60 minutes after the water is added, wherein the reaction temperature is normal temperature, and the stirring speed is 500 revolutions per minute;
step (5), adding the polymer wax into a stirrer according to a proportion, and stirring for reaction for 30 minutes at normal temperature and at a stirring speed of 200 revolutions per minute;
step (6), adding the silicon-containing high-temperature-resistant solid into a stirrer in proportion, and stirring for reaction for 30 minutes at normal temperature and at a stirring speed of 100 revolutions per minute;
and (7) adding the balance of water into the stirrer, stirring and reacting for 120 minutes at normal temperature and at the stirring speed of 200 revolutions per minute, and obtaining a finished product after stirring
As a further improvement of the present invention, in the step (1), the reaction temperature inside the stirrer is 50 to 60 ℃, and the stirrer may be any one of a tank stirrer, a twin-screw stirrer and a turbine stirrer.
As a further improvement of the invention, in the step (3), the proportion of water is 5 percent, and the adding speed is 1 percent per minute; in step (4), the proportion of water is 20% and the rate of addition is 2% per minute.
Compared with the prior art, the invention has the following beneficial effects:
the long-chain alkyl modified silicone oil used in the invention can improve the extreme pressure lubricity of common silicone oil, has good adsorbability and excellent lubricity on metal materials, and particularly has good lubricating effect on aluminum materials with poor lubricity, while the high-molecular polyester and the high-molecular wax can respectively provide lubricating action at low temperature and high temperature, so that the release agent has excellent lubricating property within the range of 200-600 ℃, and still has the advantage of excellent demolding effect at high temperature, and the silicon-containing high-temperature-resistant compound can effectively isolate the welding of a die-casting product and a mold, so that the aluminum liquid can be rapidly molded in a cavity, and the product defects and strain can be avoided.
Detailed Description
In addition, the descriptions related to the first, the second, etc. in the present invention are only used for description purposes, do not particularly refer to an order or sequence, and do not limit the present invention, but only distinguish components or operations described in the same technical terms, and are not understood to indicate or imply relative importance or implicitly indicate the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention relates to an aluminum die casting water-based mold release agent suitable for the fluorine-free refrigeration industry, which comprises the following raw materials, by weight, 1-10% of a non-ionic surfactant, 5-30% of long-chain alkyl modified silicone oil, 0-15% of high-molecular polyester, 1-15% of high-molecular wax, 0-3% of a silicon-containing high-temperature-resistant compound, and the balance of water.
Furthermore, the nonionic surfactant is one or a combination of more of isomeric alcohol polyoxyethylene ether, nonylphenol polyoxyethylene ether and octylphenol polyoxyethylene ether, and mainly plays a role in emulsifying and improving the stability of the product.
Furthermore, the long-chain alkyl modified silicone oil is one or a combination of long-chain alkyl aryl silicone oil, dodecyl methyl silicone oil and octadecyl methyl silicone oil, and mainly has the function of demoulding.
Furthermore, the high molecular polyester is one or a combination of a plurality of materials selected from the group consisting of poly palmitate, polyricinoleate and polyglycerol oleate, and mainly plays a role in low-temperature lubrication.
Furthermore, the high molecular wax is one or a combination of polyethylene wax emulsion, polypropylene wax emulsion and oxidized polyethylene wax emulsion, and mainly plays a role in high-temperature lubrication and isolation.
Furthermore, the silicon-containing high-temperature resistant compound is one or a combination of nano-scale silicon dioxide and methyl phenyl organic silicon resin emulsion, and mainly plays an effective isolation role.
In order to achieve the above purpose, the preparation method comprises the following steps:
step (1), putting a nonionic surfactant and long-chain alkyl modified silicone oil into a stirrer in proportion, mixing and stirring for reaction for 20 minutes, controlling the reaction temperature inside the stirrer, and stirring at the speed of 200 revolutions per minute;
continuously adding the high molecular polyester into the stirrer according to the proportion, stirring and reacting for 30 minutes at normal temperature and at the stirring speed of 200 revolutions per minute;
step (3), slowly adding a proper amount of water in the stirring process, and continuously stirring and reacting for 30 minutes after the water is added, wherein the reaction temperature is normal temperature, and the stirring speed is 500 revolutions per minute;
step (4), slowly adding a proper amount of water in the stirring process, and continuously stirring and reacting for 60 minutes after the water is added, wherein the reaction temperature is normal temperature, and the stirring speed is 500 revolutions per minute;
step (5), adding the polymer wax into a stirrer according to a proportion, and stirring for reaction for 30 minutes at normal temperature and at a stirring speed of 200 revolutions per minute;
step (6), adding the silicon-containing high-temperature-resistant solid into a stirrer in proportion, and stirring for reaction for 30 minutes at normal temperature and at a stirring speed of 100 revolutions per minute;
and (7) adding the balance of water into the stirrer, stirring and reacting for 120 minutes at normal temperature and at the stirring speed of 200 revolutions per minute, and obtaining a finished product after stirring.
Further, in the step (1), the reaction temperature inside the stirrer is 50 to 60 ℃, and the stirrer may be any one of a tank stirrer, a twin-screw stirrer and a turbine stirrer.
Further, in the step (3), the proportion of water is 5 percent, and the adding speed is 1 percent per minute; in step (4), the proportion of water is 20% and the rate of addition is 2% per minute.
Example 1:
5% of nonionic surfactant;
20% of long-chain alkyl modified silicone oil;
5% of high-molecular polyester;
10% of polymer wax;
1% of silicon-containing high-temperature resistant compound;
and (5) water in 59 percent.
Wherein the content of the first and second substances,
the nonionic surfactant is 3% of isomeric alcohol polyoxyethylene ether and 2% of octylphenol polyoxyethylene ether;
the long-chain alkyl modified silicone oil is octadecyl methyl silicone oil;
the high molecular polyester is poly palmitate;
the polymer wax is polypropylene wax emulsion;
the silicon-containing high-temperature resistant compound is methyl phenyl organic silicon resin emulsion.
Example 2:
5% of nonionic surfactant;
15% of long-chain alkyl modified silicone oil;
7% of high-molecular polyester;
8% of polymer wax;
1.5 percent of silicon-containing high-temperature resistant compound;
and (5) water.
Wherein the content of the first and second substances,
the nonionic surfactant is nonylphenol polyoxyethylene ether;
the long-chain alkyl modified silicone oil is dodecyl methyl silicone oil;
the high molecular polyester is polyricinoleate;
the high molecular wax is polyethylene wax emulsion;
the silicon-containing high-temperature resistant compound is methyl phenyl organic silicon resin emulsion.
Example 3:
7% of nonionic surfactant;
20% of long-chain alkyl modified silicone oil;
8% of high-molecular polyester;
10% of polymer wax;
0.5 percent of silicon-containing high-temperature resistant compound;
and 54.5 percent of water.
Wherein the content of the first and second substances,
the nonionic surfactant is octyl phenol polyoxyethylene ether;
the long-chain alkyl modified silicone oil is long-chain alkyl aryl silicone oil;
the high molecular polyester is poly palmitate;
the polymer wax is 6 percent of polyethylene wax emulsion and 4 percent of oxidized polyethylene wax emulsion;
the silicon-containing high-temperature resistant compound is nano silicon dioxide.
The following are examples 1, 2, 3 and experimental controls to comparative examples 1, 2:
1. thermal stability: diluting 50 times, and boiling for 10 min;
2. shear stability: diluting by 50 times, and stirring at 2000r/min for 10 min;
3. emulsion stability: diluting by 50 times, and centrifuging at 2000r/min for 20 min;
4. corrosion of aluminum alloy: and accurately weighing the polished aluminum alloy sheet, immersing the polished aluminum alloy sheet into a stock solution of a release agent, and keeping the temperature at 70 ℃ for 24 hours. Taking out, washing with distilled water, drying, and weighing. And comparing the quality and appearance of the aluminum alloy sheet before and after detection.
The above controls show that: the long-chain alkyl modified silicone oil used in the invention can improve the extreme pressure lubricity of common silicone oil, has good non-corrosivity, adsorptivity and excellent lubricity on metal materials, and particularly has good lubricating effect on aluminum materials with poor lubricity, and the high-molecular polyester and the high-molecular wax can respectively provide lubricating action at low temperature and high temperature, so that the release agent has excellent lubricating property within the range of 200-600 ℃, and still has the advantage of excellent demolding effect at high temperature, and the silicon-containing high-temperature-resistant compound can effectively isolate the welding of a die-casting product and a mold, so that the aluminum liquid can be rapidly molded in a cavity, and the product defects and strain can be avoided.
The nonionic surfactant is not in an ionic state in the solution, so that the nonionic surfactant is not easily influenced by strong electrolyte, acid and alkali, can be mixed with other surfactants and has good compatibility, and the nonionic surfactant combined by one or more of isomeric alcohol polyoxyethylene ether, nonylphenol polyoxyethylene ether and octylphenol polyoxyethylene ether can effectively play roles of emulsifying agent and improving the stability of products during mixing and stirring.
The long-chain alkyl modified silicone oil is polysiloxane modified by long-chain alkyl through a special process, has better lipophilicity and lubricity, good compatibility with organic materials, high temperature resistance and hydrophobicity, and good thermal stability, so that the product can be reused at high temperature without dispersing and leaving residual marks, and can play a good demoulding role.
The high molecular polyester and the polyester lubricating oil can form oil films which are not easy to break on the surfaces of two metals, and ester molecules have strong adsorption effect on the surfaces of the contacted metals to form a layer of adhesive molecular oil with high strength, so that the films are not easy to break even under the condition of large temperature difference, thereby providing continuous liquid lubrication and having good lubricating property.
The high-molecular wax is mainly added into the release agent in the form of an additive, the high-molecular wax additive generally exists in the form of aqueous emulsion, has good chemical stability and excellent temperature resistance, drug resistance and electrical property at room temperature, can effectively improve the smoothness and scratch resistance of the release agent, and plays a role in high-temperature lubrication and isolation.
The high-temp. compound containing silicon is a rubber-like film which is made up by using linear polydimethylsiloxane whose end group is active group, cross-linking agent and catalyst through curing under a certain condition, and the silicone isolating performance is derived from the outward regular arrangement of methyl groups connected with silicon atoms in the silicon-oxygen bond after curing of the film, and said methyl groups have low electronic attraction and can retain its orientation stability in the temperature range of 40-250 deg.C, so that the base material can be always shielded by methyl group, and can obtain stable isolating effect.
The above description is only an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (9)
1. An aluminum die-casting water-based mold release agent suitable for the fluoride-free refrigeration industry is characterized in that: the high-temperature-resistant silicone oil-based composite material comprises, by weight, 1-10% of a nonionic surfactant, 5-30% of long-chain alkyl modified silicone oil, 0-15% of high-molecular polyester, 1-15% of high-molecular wax, 0-3% of a silicon-containing high-temperature-resistant compound and the balance water.
2. The aluminum die casting water-based mold release agent suitable for the fluorine-free refrigeration industry according to claim 1, wherein: the nonionic surfactant is one or a combination of more of isomeric alcohol polyoxyethylene ether, nonylphenol polyoxyethylene ether and octylphenol polyoxyethylene ether.
3. The aluminum die casting water-based mold release agent suitable for the fluorine-free refrigeration industry according to claim 1, wherein: the long-chain alkyl modified silicone oil is one or a combination of long-chain alkyl aryl silicone oil, dodecyl methyl silicone oil and octadecyl methyl silicone oil.
4. The aluminum die casting water-based mold release agent suitable for the fluorine-free refrigeration industry according to claim 1, wherein: the high molecular polyester is one or a combination of a plurality of materials selected from the group consisting of poly palmitate, polyricinoleate and polyglycerol oleate.
5. The aluminum die casting water-based mold release agent suitable for the fluorine-free refrigeration industry according to claim 1, wherein: the polymer wax is one or a combination of polyethylene wax emulsion, polypropylene wax emulsion and oxidized polyethylene wax emulsion.
6. The aluminum die casting water-based mold release agent suitable for the fluorine-free refrigeration industry according to claim 1, wherein: the silicon-containing high-temperature resistant compound is one or a combination of nano-scale silicon dioxide and methyl phenyl organic silicon resin emulsion.
7. The aluminum die casting water-based mold release agent suitable for the fluorine-free refrigeration industry according to claim 1, wherein: the preparation method comprises the following steps:
step (1), putting a nonionic surfactant and long-chain alkyl modified silicone oil into a stirrer in proportion, mixing and stirring for reaction for 20 minutes, controlling the reaction temperature inside the stirrer, and stirring at the speed of 200 revolutions per minute;
continuously adding the high molecular polyester into the stirrer according to the proportion, stirring and reacting for 30 minutes at normal temperature and at the stirring speed of 200 revolutions per minute;
step (3), slowly adding a proper amount of water in the stirring process, and continuously stirring and reacting for 30 minutes after the water is added, wherein the reaction temperature is normal temperature, and the stirring speed is 500 revolutions per minute;
step (4), slowly adding a proper amount of water in the stirring process, and continuously stirring and reacting for 60 minutes after the water is added, wherein the reaction temperature is normal temperature, and the stirring speed is 500 revolutions per minute;
step (5), adding the polymer wax into a stirrer according to a proportion, and stirring for reaction for 30 minutes at normal temperature and at a stirring speed of 200 revolutions per minute;
step (6), adding the silicon-containing high-temperature-resistant solid into a stirrer in proportion, and stirring for reaction for 30 minutes at normal temperature and at a stirring speed of 100 revolutions per minute;
and (7) adding the balance of water into the stirrer, stirring and reacting for 120 minutes at normal temperature and at the stirring speed of 200 revolutions per minute, and obtaining a finished product after stirring.
8. The aluminum die casting water-based mold release agent suitable for the fluorine-free refrigeration industry according to claim 7, wherein:
in the step (1), the reaction temperature inside the stirrer is 50 to 60 ℃, and the stirrer may be any one of a tank stirrer, a twin-screw stirrer, and a turbine stirrer.
9. The aluminum die casting water-based mold release agent suitable for the fluorine-free refrigeration industry according to claim 7, wherein:
in the step (3), the proportion of water is 5 percent, and the adding speed is 1 percent per minute;
in step (4), the proportion of water is 20% and the rate of addition is 2% per minute.
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| CN202110514817.0A CN113245505A (en) | 2021-05-10 | 2021-05-10 | Aluminum die-casting water-based mold release agent suitable for fluoride-free refrigeration industry |
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| CN202110514817.0A CN113245505A (en) | 2021-05-10 | 2021-05-10 | Aluminum die-casting water-based mold release agent suitable for fluoride-free refrigeration industry |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114932195A (en) * | 2022-04-27 | 2022-08-23 | 重庆渝江压铸有限公司 | Mold release agent with excellent thermal stability and preparation method thereof |
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2021
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| CN101875220A (en) * | 2009-04-28 | 2010-11-03 | 汉高股份有限公司 | Mold release agent and preparation method and application thereof |
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| CN109501074A (en) * | 2017-09-14 | 2019-03-22 | 衢州市中通化工有限公司 | A kind of preparation method of fluorine carbon release agent |
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