CN108788002B - Heat-resistant aluminum alloy die-casting release agent and preparation method and use method thereof - Google Patents
Heat-resistant aluminum alloy die-casting release agent and preparation method and use method thereof Download PDFInfo
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- CN108788002B CN108788002B CN201810996683.9A CN201810996683A CN108788002B CN 108788002 B CN108788002 B CN 108788002B CN 201810996683 A CN201810996683 A CN 201810996683A CN 108788002 B CN108788002 B CN 108788002B
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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 provides a heat-resistant aluminum alloy die-casting release agent, and a preparation method and a use method thereof. The heat-resistant aluminum alloy die-casting release agent comprises the following components in parts by weight: 20-30 parts of oxidized polyethylene wax, 10-20 parts of organic modified silicone oil, 5-15 parts of anionic surfactant, 1-5 parts of nonionic surfactant, 10-20 parts of volcanic ash, 1-5 parts of black corundum, 1-5 parts of triethanolamine and 20-50 parts of water. The heat-resistant aluminum alloy die-casting release agent has good heat resistance, good lubricating and demolding properties and good stability, still has good demolding properties after heat treatment at the temperature of 400 ℃, and a casting after demolding has high surface smoothness and good room-temperature standing stability.
Description
Technical Field
The invention belongs to the technical field of release agents, relates to a release agent, and a preparation method and a use method thereof, and particularly relates to a heat-resistant aluminum alloy die-casting release agent, and a preparation method and a use method thereof.
Background
The aluminum alloy is die-cast and widely applied to industries of automobiles, electronics, communication and the like. The mold release agent is an indispensable material for the die casting process. At present, the traditional aluminum alloy high-strength casting is produced by adopting gravity casting or low-pressure casting, the aluminum alloy engine bracket for the automobile manufactured by the traditional processes has quality problems of cold shut, depression, cracks and other degrees in appearance, and fatal defects of air holes, shrinkage cavities, pin holes and the like are often generated in the aluminum alloy engine bracket, so that the performance of the product is seriously influenced. Meanwhile, the high-speed development of automobiles is hindered due to the defects of low yield, low utilization rate of resources and energy, low recycling rate of aluminum waste, serious environmental pollution and the like. Die casting is a dynamic thermodynamic process in which the cavity surfaces are subjected to high pressure, high velocity, and high temperature liquid metal scours. Most of the die-casting moulds are made of H13 steel, and the aluminum and zinc alloy has good wetting effect on the die-casting moulds, so that the die-casting moulds have strong tendency to be attached to the surfaces of the die cavities. The release agent is sprayed to form a film on the surface of the cavity to isolate the liquid metal. Therefore, the careful selection and reasonable spraying operation of the release agent are important factors for ensuring the casting quality, the service life of the die-casting mould and the production efficiency.
The release agent (also called a mold coating agent) is a functional substance between a mold and a finished product, is designed for special molding forming processing, has chemical resistance, is not dissolved when chemical components (particularly styrene and amines) of different resins are contacted, has heat resistance and stress resistance, and is not easy to decompose and wear; the release agent adheres to the mold without transferring to the article being worked, does not interfere with painting or other secondary working operations, and is an auxiliary agent for producing metal die-cast products. Its main function is to help the metal die cast product to be able to be removed from the mould and to maintain the integrity and post-processability of the product. The main function of the release agent is to form a uniform release film on the surface of a mold, so that a molded product can be released. The second function is to take into account the quality and pattern of the surface of the molded line, the fouling on the mold and the feasibility of cleaning and coating. Other factors to consider include: shelf life of the product, stability of the product, health or safety concerns for the user, and corrosion problems.
The water-based release agent takes water as a dispersion medium, water is rapidly evaporated in a high-temperature environment, effective substances of the release agent are uniformly distributed on the surface of a cavity, and the water-based release agent has uniform film formation, strong adhesive force, high-temperature scouring resistance and good release property, so that the water-based release agent is favored by users in recent years. The emulsion water-based die-casting demolding coating has the advantages of excellent high-temperature film-forming property, cooling lubricity, convenience in use, operation environment protection, smooth surface of the obtained casting and the like, and is most widely applied to the aluminum alloy die-casting process.
CN106311968A discloses an aluminum alloy template release agent and a preparation method thereof, wherein the aluminum alloy template release agent is composed of the following raw materials in parts by weight: 10-20 parts of polyethylene wax, 1-5 parts of polyvinyl alcohol, 4-9 parts of silicone oil, 2-6 parts of borax, 19-27 parts of talcum powder, 6-14 parts of sodium dodecyl benzene sulfonate, 0.2-1.3 parts of hexadecyl trimethyl ammonium chloride, 5-10 parts of a compound emulsifier, 0.05-0.2 part of dichlorophen, 0.1-0.25 part of oxypropylene ethylene oxide glycerol ether, 0.2-1.4 parts of a corrosion inhibitor and 60-90 parts of water; the preparation method is simple, the compounded emulsifier, the dichlorophen and the corrosion inhibitor are added, so that the release agent is safer, cleaner and pollution-free, compared with the traditional oil-based release agent, the oil-based release agent has the advantages of good cooling effect, no accumulation and good casting surface quality, compared with the powdery release agent, the aluminum alloy powder release agent has the advantage of low cost in application in the aspect of aluminum alloy die casting, but the high temperature resistance of the aluminum alloy powder release agent needs to be further improved.
CN107999692A discloses a die-casting aluminum alloy water-based mold release agent, which is characterized in that the mold release agent consists of mineral oil, a lubricant, silicone oil, a surfactant, a preservative, a wetting agent, a stabilizer, a thickener and water, and the mass percentage of the components is as follows: 20-30 parts of engine oil, 10-15 parts of silicone oil, 1-5 parts of silicon dioxide, 5-7 parts of stearic acid, 8-10 parts of polyoxyethylene fatty acid ester, 4-6 parts of polyoxyethylene oleyl ether, 0.5-1.5 parts of organic molybdenum compound, 3-5 parts of beeswax, 0.5-1.5 parts of ethanol, 0.5-1 part of sodium nitrite, 0.5-2 parts of triethanolamine, 0.5-2 parts of organic silicon wetting agent, 0.5-1 part of thickening agent, 0.5-2 parts of sodium benzoate, 0.5-2 parts of sodium phosphate, 0.5-1 part of sorbic acid and 25-35 parts of water. In the die-casting aluminum alloy aqueous release agent, the surface of a casting is smooth, and the defects of die sticking, pulling damage or deformation are effectively prevented. However, after the release agent is treated at a high temperature or left to stand, the release effect and the lubricating property of the release agent are deteriorated, and the stability and the high temperature resistance thereof are desired to be further improved.
CN107876692A discloses a high-performance water-based metal die casting release agent, a preparation method and application thereof, wherein the metal die casting release agent is applied to the surface of a metal die before casting and consists of a functional organic composition, an auxiliary agent and a solvent; the functional organic composition comprises high-temperature-resistant resin, high-temperature-resistant silicone oil, mineral oil and animal and vegetable oil; the auxiliary agent comprises a nonionic surfactant, a defoaming agent, a preservative and a bactericide; the solvent is deionized water. The metal die casting release agent has good wetting property and release property, good cooling property and heat insulation property, but the high temperature resistance and stability of the metal die casting release agent are also required to be further improved.
Disclosure of Invention
In view of the defects of the prior art, one of the purposes of the invention is to provide a heat-resistant aluminum alloy die-casting release agent which has good lubricity and release performance in a high-temperature environment, has good stability, is easy to release when a die-cast casting is separated from a die, and has high surface smoothness of the demolded casting.
In order to achieve the purpose, the invention adopts the following technical scheme:
a heat-resistant aluminum alloy die-casting release agent comprises the following components in parts by weight:
according to the invention, oxidized polyethylene wax and organic modified silicone oil are taken as basic raw materials, an anionic surfactant and a nonionic surfactant are added as an emulsifier to improve the stability, high-temperature-resistant and fire-resistant volcanic ash is added to effectively promote the solidification sequence of alloy liquid, black corundum is added to improve the surface smoothness of a casting, triethanolamine and water are added, the compatibility among the raw materials is good, the prepared heat-resistant aluminum alloy die-casting release agent has good stability by adjusting the dosage of each component, the lubricating property and the demolding property under a high-temperature environment are good, the die-casting after die-casting is easy to demold when being separated from a die, and the surface smoothness of the casting after demolding is high.
Specifically, the heat-resistant aluminum alloy die-casting release agent comprises the following components in parts by weight:
the oxidized polyethylene wax is 20-30 parts, for example, the parts by weight of the oxidized polyethylene wax are 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts and 30 parts.
10-20 parts of organic modified silicone oil, for example, the parts by weight of the organic modified silicone oil are 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts and 20 parts.
5-15 parts of anionic surfactant, for example, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts and 15 parts of anionic surfactant.
1-5 parts of nonionic surfactant, for example, the parts by weight of the nonionic surfactant are 1 part, 2 parts, 3 parts, 4 parts and 5 parts.
10-20 parts of volcanic ash, for example, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts and 20 parts of volcanic ash.
1-5 parts of black corundum, for example, 1 part, 2 parts, 3 parts, 4 parts and 5 parts of black corundum.
1-5 parts of triethanolamine, for example, 1 part, 2 parts, 3 parts, 4 parts and 5 parts of triethanolamine.
20-50 parts of water, for example, the parts by weight of the water are 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, 31 parts, 32 parts, 33 parts, 34 parts, 35 parts, 36 parts, 37 parts, 38 parts, 39 parts, 40 parts, 41 parts, 42 parts, 43 parts, 44 parts, 45 parts, 46 parts, 47 parts, 48 parts, 49 parts and 50 parts.
In the invention, the organic modified silicone oil is one or a mixture of at least two of methyl phenyl modified silicone oil, long-chain alkyl phenyl modified silicone oil and amino modified silicone oil, compared with base oil such as conventional dimethyl silicone oil, the organic modified silicone oil has better lubricating effect, improved high temperature resistance and better compatibility with other components. Typical but non-limiting combinations of the mixtures are as follows: the mixture is a mixture of two kinds of organic modified silicone oils, such as a mixture of methylphenyl modified silicone oil and long-chain alkyl modified silicone oil, a mixture of methylphenyl modified silicone oil and long-chain alkylphenyl modified silicone oil, a mixture of methylphenyl modified silicone oil and amino modified silicone oil, a mixture of long-chain alkyl modified silicone oil and long-chain alkylphenyl modified silicone oil, a mixture of long-chain alkyl modified silicone oil and amino modified silicone oil, and a mixture of long-chain alkylphenyl modified silicone oil and amino modified silicone oil; the mixture can also be a mixture of three organic modified silicone oils, such as a mixture of methylphenyl modified silicone oil, long-chain alkyl modified silicone oil and long-chain alkylphenyl modified silicone oil, a mixture of methylphenyl modified silicone oil, long-chain alkyl modified silicone oil and amino modified silicone oil, and a mixture of long-chain alkyl modified silicone oil, long-chain alkylphenyl modified silicone oil and amino modified silicone oil; the mixture may also be a mixture of four kinds of organic modified silicone oils, for example, a mixture of methylphenyl modified silicone oil, long-chain alkyl modified silicone oil, long-chain alkylphenyl modified silicone oil and amino modified silicone oil.
Preferably, the organic modified silicone oil is a mixture of methyl phenyl modified silicone oil and long-chain alkyl modified silicone oil; more preferably, the mass ratio of the methylphenyl modified silicone oil to the long-chain alkyl modified silicone oil is 1 (1-3), and for example, the mass ratio of the methylphenyl modified silicone oil to the long-chain alkyl modified silicone oil is 1:1, 1:1.5, 1:2, 1:2.5, 1: 3.
For the water-based release agent, the phenomenon of delamination is easy to occur after the water-based release agent is placed or stored for a long time, so the selection and the compounding of the surfactant are particularly important. In the invention, the mass ratio of the anionic surfactant to the nonionic surfactant is (2-3): 1, and the mass ratio of the two surfactants is adjusted to be 2.1:1, 2.2:1, 2.3:1, 2.4:1, 2.5:1, 2.6:1, 2.7:1, 2.8:1, 2.9:1 and 3: 1.
Wherein the anionic surfactant is sodium dodecyl benzene sulfonate.
Preferably, the nonionic surfactant is one or a mixture of at least two of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, fatty alcohol polyoxypropylene ether and sorbitan fatty acid ester, and the mixture typically but not limited to the combination of the following: the mixture is a mixture of two nonionic surfactants, such as a mixture of fatty alcohol-polyoxyethylene ether and alkylphenol polyoxyethylene ether, a mixture of fatty alcohol-polyoxyethylene ether and fatty alcohol-polyoxypropylene ether, a mixture of fatty alcohol-polyoxyethylene ether and sorbitan fatty acid ester, a mixture of alkylphenol polyoxyethylene ether and fatty alcohol-polyoxypropylene ether, a mixture of alkylphenol polyoxyethylene ether and sorbitan fatty acid ester, and a mixture of fatty alcohol-polyoxypropylene ether and sorbitan fatty acid ester; the mixture can also be a mixture of three nonionic surfactants, such as a mixture of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether and fatty alcohol polyoxypropylene ether, a mixture of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether and sorbitan fatty acid ester, a mixture of alkylphenol polyoxyethylene ether, fatty alcohol polyoxypropylene ether and sorbitan fatty acid ester; the mixture may also be a mixture of four nonionic surfactants, such as a mixture of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, fatty alcohol polyoxypropylene ether and sorbitan fatty acid ester.
Wherein, volcanic ash particles as fire-resistant and high-temperature resistant materials are bonded on the surface of the metal model, and a semi-permanent isolating layer is formed between the casting and the mould in the solidification process; the fineness of the volcanic ash is 300-500 meshes, for example, the fineness of the volcanic ash is 300 meshes, 310 meshes, 320 meshes, 330 meshes, 340 meshes, 350 meshes, 360 meshes, 370 meshes, 380 meshes, 390 meshes, 400 meshes, 410 meshes, 420 meshes, 430 meshes, 440 meshes, 450 meshes, 460 meshes, 470 meshes, 480 meshes, 490 meshes or 500 meshes; the volcanic ash particles in the range are selected, so that the adhesive force of the release agent is good, and the surface of the prepared casting has good smoothness.
The invention also aims to provide a preparation method of the heat-resistant aluminum alloy die-casting release agent, which comprises the following steps: weighing 20-30 parts of oxidized polyethylene wax and 10-20 parts of organic modified silicone oil, adding the materials into a reaction kettle, mixing, uniformly stirring, adding 10-20 parts of volcanic ash and 1-5 parts of black corundum, mixing, uniformly stirring, heating, adding 5-15 parts of anionic surfactant, 1-5 parts of nonionic surfactant, 1-5 parts of triethanolamine and 20-50 parts of water, and continuously stirring to obtain the heat-resistant aluminum alloy die-casting release agent.
The stirring time is 2-5 h, for example, the stirring time is 2h, 3h, 4h and 5 h.
Preferably, the temperature of the temperature rise is 50 to 80 ℃, for example, the temperature of the temperature rise is 50 ℃, 55 ℃, 60 ℃, 65 ℃, 70 ℃, 75 ℃ and 80 ℃.
Preferably, the viscosity of the heat-resistant aluminum alloy die-casting mold release agent is 3000 to 8000 pas, for example, 3000 pas, 4000 pas, 5000 pas, 6000 pas, 7000 pas, 8000 pas. The viscosity range is selected, so that the bonding strength and the lubricating property of the release agent can be ensured, and the release of the casting is facilitated. If the viscosity is outside this range, the viscosity is adjusted to this range by adding a binder or water.
The invention also aims to provide a use method of the heat-resistant aluminum alloy die-casting release agent, which is characterized in that the heat-resistant aluminum alloy die-casting release agent is diluted by water and sprayed on the surface of a die.
Preferably, the method for using the heat-resistant aluminum alloy die casting release agent of the invention specifically comprises the following steps:
1) removing impurities from the mould and preheating;
2) diluting the heat-resistant aluminum alloy die-casting release agent with water, and spraying the diluted release agent on the surface of the preheated die in the step 1).
In the step 1), the impurity removal process is one or a mixture of at least two of metal brush cleaning, polishing, sand blasting and shot blasting.
Preferably, in the step 1), the preheating temperature is 200-400 ℃, for example, the preheating temperature is 200 ℃, 250 ℃, 300 ℃, 350 ℃ and 400 ℃.
Preferably, in the step 2), the mass ratio of the heat-resistant aluminum alloy die casting release agent to the water is 1 (2-5), for example, the mass ratio of the heat-resistant aluminum alloy die casting release agent to the water is 1:1, 1:2, 1:3, 1:4, 1:5, and the cost of die casting can be reduced to a greater extent by diluting the heat-resistant aluminum alloy die casting release agent with water.
When in spraying, the temperature of the mould is too high, the atomization is violent when water is contacted with the mould, the sprayed coating is evaporated and rebounded on the surface of the mould, the wetting effect is avoided, and the effective components cannot be deposited on the surface of the cavity, thereby causing waste; the temperature of the mould is too low, the water evaporation is little, the coating flows, the effective components can not be deposited, and the waste of the coating is also caused; therefore, in order to effectively utilize the coating material, the mold temperature at the time of spraying should be preferably selected on the basis of the wetting temperature of the coating material. Preferably, the temperature of the mold during spraying is ensured to be in the range of 150-250 ℃, and if the temperature of the mold is too high and is higher than 250 ℃, a porous coating is formed after the mold release agent is sprayed, the adhesion and the durability of the coating are reduced, and the coating is easy to peel off; if the temperature of the mold is too low, the release agent coating is too dense, coating cracks and bubbles are easy to generate, and the heat insulation performance is reduced.
Compared with the prior art, the invention has the beneficial effects that:
(1) the heat-resistant aluminum alloy die-casting release agent has good heat resistance, good lubricating and demolding properties and good stability, still has good demolding properties after heat treatment at the temperature of 400 ℃, and a cast after demolding has high surface smoothness; the decomposition is started after the heat treatment at 500 ℃, and the violent decomposition is started after the heat treatment at 550 ℃; after the heat-resistant aluminum alloy die-casting release agent is placed at room temperature for 3 months, the release agent has no layering phenomenon, and the heat-resistant aluminum alloy die-casting release agent disclosed by the invention has good room-temperature placing stability.
(2) The heat-resistant aluminum alloy die-casting release agent has good cooling and heat insulation properties, has high-efficiency cooling and heat insulation effects, reduces the abrasion of high-temperature and high-pressure liquid metal to a die by high-speed scouring, and prolongs the service life.
(3) The release agent for the heat-resistant aluminum alloy die-casting has high chemical stability, the release agent has little gas evolution in the use temperature range, the die is not corroded, the cast product has clear outline, the surface is smooth and has no trace, and the coating is not influenced.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments.
Unless otherwise specified, various starting materials of the present invention are commercially available or prepared according to conventional methods in the art.
Example 1
The heat-resistant aluminum alloy die-casting release agent comprises the following components in parts by weight:
wherein the fineness of the volcanic ash is 300 meshes.
According to the preparation method of the heat-resistant aluminum alloy die-casting release agent, according to the proportion, oxidized polyethylene wax and organic modified silicone oil are added into a reaction kettle and mixed, then stirred for 2 hours until the mixture is uniform, volcanic ash and black corundum are added and mixed, then stirred uniformly, the temperature is increased to 80 ℃, then anionic surfactant, nonionic surfactant, triethanolamine and water are added, and stirring is continued for 3 hours until the viscosity is 5000 Pa.s, and then the stirring is stopped, so that the heat-resistant aluminum alloy die-casting release agent is obtained.
The prepared heat-resistant aluminum alloy die-casting release agent is used for die-casting an automobile aluminum alloy hub, and comprises the following steps:
1) cleaning a die with a metal brush, polishing, sandblasting, shot blasting and impurity removal, and preheating at 200 ℃;
2) diluting the heat-resistant aluminum alloy die-casting release agent with water, and spraying the diluted release agent on the surface of the preheated die in the step 1), wherein the mass ratio of the heat-resistant aluminum alloy die-casting release agent to the water is 1: 3.
Example 2
The heat-resistant aluminum alloy die-casting release agent comprises the following components in parts by weight:
wherein the fineness of the volcanic ash is 400 meshes.
According to the preparation method of the heat-resistant aluminum alloy die-casting release agent, according to the proportion, oxidized polyethylene wax and organic modified silicone oil are added into a reaction kettle and mixed, then stirred for 3 hours until the mixture is uniform, volcanic ash and black corundum are added and mixed, then stirred uniformly, the temperature is raised to 60 ℃, anionic surfactant, nonionic surfactant, triethanolamine and water are added, and stirring is continued for 4 hours until the viscosity is 3000 Pa.s, so that the heat-resistant aluminum alloy die-casting release agent is obtained.
The prepared heat-resistant aluminum alloy die-casting release agent is used for die-casting an automobile aluminum alloy hub, and comprises the following steps:
1) cleaning a die with a metal brush, polishing, sandblasting, shot blasting and impurity removal, and preheating at 200 ℃;
2) diluting the heat-resistant aluminum alloy die-casting release agent with water, and spraying the diluted release agent on the surface of the preheated die in the step 1), wherein the mass ratio of the heat-resistant aluminum alloy die-casting release agent to the water is 1: 5.
Example 3
The heat-resistant aluminum alloy die-casting release agent comprises the following components in parts by weight:
wherein the fineness of the volcanic ash is 500 meshes.
According to the preparation method of the heat-resistant aluminum alloy die-casting release agent, according to the proportion, oxidized polyethylene wax and organic modified silicone oil are added into a reaction kettle and mixed, then stirred for 1 hour until the mixture is uniform, volcanic ash and black corundum are added and mixed, then the mixture is uniformly stirred, after the temperature is raised to 70 ℃, anionic surfactant, nonionic surfactant, triethanolamine and water are added, and the stirring is stopped when the mixture is continuously stirred for 3 hours until the viscosity is 6000 Pa.s, so that the heat-resistant aluminum alloy die-casting release agent is obtained.
The prepared heat-resistant aluminum alloy die-casting release agent is used for die-casting an automobile aluminum alloy hub, and comprises the following steps:
1) cleaning a die with a metal brush, polishing, sandblasting, shot blasting and impurity removal, and preheating at 200 ℃;
2) diluting the heat-resistant aluminum alloy die-casting release agent with water, and spraying the diluted release agent on the surface of the preheated die in the step 1), wherein the mass ratio of the heat-resistant aluminum alloy die-casting release agent to the water is 1: 4.
Example 4
The heat-resistant aluminum alloy die-casting release agent comprises the following components in parts by weight:
wherein the fineness of the volcanic ash is 400 meshes.
According to the preparation method of the heat-resistant aluminum alloy die-casting release agent, according to the proportion, oxidized polyethylene wax and organic modified silicone oil are added into a reaction kettle and mixed, then stirred for 4 hours until the mixture is uniform, then volcanic ash and black corundum are added and mixed, then stirred uniformly, after the temperature is raised to 50 ℃, anionic surfactant, nonionic surfactant, triethanolamine and water are added, and stirring is continued for 2 hours until the viscosity is 6000 Pa.s, so that the heat-resistant aluminum alloy die-casting release agent is obtained.
The prepared heat-resistant aluminum alloy die-casting release agent is used for die-casting an automobile aluminum alloy hub, and comprises the following steps:
1) cleaning a die with a metal brush, polishing, sandblasting, shot blasting and impurity removal, and preheating at 200 ℃;
2) diluting the heat-resistant aluminum alloy die-casting release agent with water, and spraying the diluted release agent on the surface of the preheated die in the step 1), wherein the mass ratio of the heat-resistant aluminum alloy die-casting release agent to the water is 1:2.
Example 5
The heat-resistant aluminum alloy die-casting release agent comprises the following components in parts by weight:
wherein the fineness of the volcanic ash is 350 meshes.
According to the preparation method of the heat-resistant aluminum alloy die-casting release agent, according to the proportion, oxidized polyethylene wax and organic modified silicone oil are added into a reaction kettle and mixed, then stirred for 2 hours until the mixture is uniform, volcanic ash and black corundum are added and mixed, then stirred uniformly, the temperature is raised to 60 ℃, anionic surfactant, nonionic surfactant, triethanolamine and water are added, and stirring is continued for 4 hours until the viscosity is 5000 Pa.s, and then the stirring is stopped, so that the heat-resistant aluminum alloy die-casting release agent is obtained.
The prepared heat-resistant aluminum alloy die-casting release agent is used for die-casting an automobile aluminum alloy hub, and comprises the following steps:
1) cleaning a die with a metal brush, polishing, sandblasting, shot blasting and impurity removal, and preheating at 200 ℃;
2) diluting the heat-resistant aluminum alloy die-casting release agent with water, and spraying the diluted release agent on the surface of the preheated die in the step 1), wherein the mass ratio of the heat-resistant aluminum alloy die-casting release agent to the water is 1: 3.
The heat-resistant aluminum alloy die-casting release agent prepared in the embodiments 1-5 of the invention can resist high temperature, still has good release performance after heat treatment at 400 ℃, has good lubricating effect, and has high surface smoothness of a casting after being released, and the casting is easy to separate from a die; the bonding strength is good, and 1000 castings can be continuously poured; the decomposition is started after the heat treatment at 500 ℃, and the violent decomposition is started after the heat treatment at 550 ℃; after the heat-resistant aluminum alloy die-casting release agent is placed at room temperature for 3 months, the release agent has no layering phenomenon, and the heat-resistant aluminum alloy die-casting release agent disclosed by the invention has good room-temperature placing stability.
Comparative example 1
The difference between the comparative example and the example 1 is that unmodified silicone oil dimethyl silicone oil is used in the preparation raw materials, the rest is the same as that of the example 1, the release agent prepared by the comparative example is decomposed quickly after being treated at the high temperature of 300 ℃, is easy to delaminate after standing, has poor lubricating property after spraying, and is difficult to separate from a mold when a casting is released.
Comparative example 2
The comparative example is different from example 1 in that the raw material for preparation does not contain the nonionic surfactant, and the rest is the same as example 1, and the release agent of the comparative example is difficult to separate from the mold when the casting is released from the mold after spraying.
Comparative example 3
The comparative example is different from example 1 in that the mass ratio of the anionic surfactant to the nonionic surfactant in the raw materials for preparation is 5:1, and the delamination or precipitation phenomenon is severe after storage for one year at room temperature.
Comparative example 4
The difference between the comparative example and the example 1 is that the volcanic ash is not used in the raw materials, the rest is the same as that of the example 1, the release agent prepared by the comparative example has poor adhesion, separation is difficult when a casting is released, the release agent is decomposed quickly after being treated at the high temperature of 300 ℃, and the release performance is poor.
Comparative example 5
The difference between the comparative example and the example 1 is that the amount of the volcanic ash in the raw materials is 80 parts, the fineness of the volcanic ash is 800 meshes, the rest is the same as that of the example 1, and the surface smoothness of the casting prepared by the release agent prepared by the comparative example after being released is poor.
Comparative example 6
The comparative example differs from example 1 in that no black corundum was used in the preparation raw material, and the other examples are the same as example 1, and the casting surface was not smooth after the mold release agent of the comparative example was sprayed.
Comparative example 7
The comparative example differs from example 1 in that triethanolamine was not contained in the preparation raw materials, and the others were the same as those of example 1, and the mold release agent obtained in the comparative example was seriously delaminated or precipitated after being stored at room temperature for one year.
Comparative example 8
This comparative example is different from example 1 in that it is used without preheating treatment, and is otherwise the same as example 1. The mold is not preheated, cracks and bubbles are generated after the release agent is sprayed, and the effect is not good during demolding.
Comparative example 9
The comparative example is different from example 1 in that the mass ratio of the methyl phenyl modified silicone oil to the long chain alkyl modified silicone oil in the raw materials for preparation is 6:1, and the rest is the same as that of example 1, and the mold release agent prepared by the comparative example has serious delamination or precipitation phenomenon after being stored for one year at room temperature.
Comparative example 10
The comparative example is different from example 1 in that in the using method, the mass ratio of the heat-resistant aluminum alloy die-casting release agent to the water is 1:10, the rest is the same as that of example 1, the adhesive force of the release agent after spraying is poor, and the surface smoothness of a casting is poor.
The present invention is illustrated by the above-mentioned examples, but the present invention is not limited to the above-mentioned detailed process equipment and process flow, i.e. it is not meant to imply that the present invention must rely on the above-mentioned detailed process equipment and process flow to be practiced. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (16)
1. The heat-resistant aluminum alloy die-casting release agent is characterized by comprising the following components in parts by weight:
2. a heat-resistant aluminum alloy die casting release agent according to claim 1, wherein the organic modified silicone oil is one or a mixture of at least two of methyl phenyl modified silicone oil, long chain alkyl phenyl modified silicone oil and amino modified silicone oil.
3. A heat-resistant aluminum alloy die casting release agent according to claim 2, characterized in that the organic modified silicone oil is a mixture of methylphenyl modified silicone oil and long-chain alkyl modified silicone oil.
4. A heat-resistant aluminum alloy die casting release agent according to claim 3, wherein the mass ratio of the methylphenyl modified silicone oil to the long-chain alkyl modified silicone oil is 1 (1-3).
5. A heat-resistant aluminum alloy die casting release agent according to claim 1, characterized in that the mass ratio of the anionic surfactant to the nonionic surfactant is (2-3): 1.
6. A heat-resistant aluminum alloy die casting release agent according to claim 1, wherein the anionic surfactant is sodium dodecylbenzenesulfonate.
7. The heat-resistant aluminum alloy die casting release agent as claimed in claim 1, wherein the nonionic surfactant is one or a mixture of at least two of fatty alcohol-polyoxyethylene ether, alkylphenol ethoxylate, fatty alcohol-polyoxypropylene ether and sorbitan fatty acid ester.
8. The heat-resistant aluminum alloy die casting release agent as claimed in claim 1, wherein the pozzolan has a fineness of 300 to 500 mesh.
9. A method for preparing a heat-resistant aluminum alloy die casting release agent according to any one of claims 1 to 8, characterized by comprising the steps of: weighing 20-30 parts of oxidized polyethylene wax and 10-20 parts of organic modified silicone oil, adding the materials into a reaction kettle, mixing, uniformly stirring, adding 10-20 parts of volcanic ash and 1-5 parts of black corundum, mixing, uniformly stirring, heating, adding 5-15 parts of anionic surfactant, 1-5 parts of nonionic surfactant, 1-5 parts of triethanolamine and 20-50 parts of water, and continuously stirring to obtain the heat-resistant aluminum alloy die-casting release agent.
10. The preparation method according to claim 9, wherein the stirring time is 2-5 hours.
11. The method according to claim 9, wherein the temperature of the elevated temperature is 50 to 80 ℃.
12. The production method according to claim 9, wherein the viscosity of the heat-resistant aluminum alloy die casting release agent is 3000 to 8000 Pa-s.
13. The use of the heat-resistant aluminum alloy die casting release agent according to any one of claims 1 to 8, characterized in that the heat-resistant aluminum alloy die casting release agent is diluted with water and sprayed on the surface of a mold;
the temperature of the die is 150-250 ℃ during spraying;
the mass ratio of the heat-resistant aluminum alloy die-casting release agent to the water is 1 (2-5).
14. The use method according to claim 13, characterized in that it comprises in particular the following steps:
1) removing impurities from the mould and preheating;
2) diluting the heat-resistant aluminum alloy die-casting release agent with water, and spraying the diluted release agent on the surface of the preheated die in the step 1).
15. The use method according to claim 14, wherein in the step 1), the impurity removing process is one or a mixture of at least two of metal brush cleaning, grinding, sand blasting and shot blasting.
16. The use method according to claim 14, wherein in the step 1), the temperature for preheating is 200-400 ℃.
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| CN110935840A (en) * | 2019-07-23 | 2020-03-31 | 常州聚鸿环保科技有限公司 | Copper forging mold release agent and preparation method thereof |
| CN110576166A (en) * | 2019-10-21 | 2019-12-17 | 徐州市国艺铝合金包装箱有限公司 | Aluminum alloy adopting low-temperature die casting |
| CN111979032B (en) * | 2020-09-28 | 2022-08-12 | 宁波德曜新材料有限公司 | Water-based aluminum die-casting release agent and preparation method thereof |
| CN112387923A (en) * | 2020-10-21 | 2021-02-23 | 重庆市宇红轨道车辆配件有限公司 | Heat-resistant release agent for brake shoe manufacturing and preparation method thereof |
| 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 |
| CN113245505A (en) * | 2021-05-10 | 2021-08-13 | 肇庆洛德化工科技有限公司 | Aluminum die-casting water-based mold release agent suitable for fluoride-free refrigeration industry |
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| CN114682731A (en) * | 2022-04-24 | 2022-07-01 | 连云港倍力达新材料有限公司 | Mold release agent for aluminum alloy LED lamp product |
| CN115786030A (en) * | 2022-12-01 | 2023-03-14 | 南京科技职业学院 | Forging mold release agent and preparation method thereof |
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| CN103182486A (en) * | 2011-12-28 | 2013-07-03 | 上海航天精密机械研究所 | Method for coating alloy metal mould casting die |
| 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 |
| JP6613683B2 (en) * | 2014-12-25 | 2019-12-04 | アイシン精機株式会社 | Powder release agent and method for producing the same |
| 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 |
| CN105728639B (en) * | 2016-04-18 | 2018-03-27 | 苏州兴业材料科技股份有限公司 | Water-based aluminum alloy mould release agent and preparation method thereof |
| CN107511448B (en) * | 2017-08-03 | 2019-08-02 | 天能电池集团股份有限公司 | A kind of lead storage battery grid casting release agent and preparation method thereof |
| CN107876692B (en) * | 2017-09-26 | 2020-05-22 | 上海力太化学有限公司 | High-performance water-based metal die-casting release agent |
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