CN108907074B - Anti-oxidation release agent and preparation method and use method thereof - Google Patents
Anti-oxidation release agent and preparation method and use method thereof Download PDFInfo
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- CN108907074B CN108907074B CN201810778185.7A CN201810778185A CN108907074B CN 108907074 B CN108907074 B CN 108907074B CN 201810778185 A CN201810778185 A CN 201810778185A CN 108907074 B CN108907074 B CN 108907074B
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- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
Abstract
The invention provides an anti-oxidation release agent, and a preparation method and a use method thereof. The anti-oxidation release agent comprises the following components in parts by weight: 20-50 parts of volcanic ash, 10-30 parts of vermiculite, 10-20 parts of diatomite, 5-10 parts of titanium dioxide, 2-5 parts of graphite powder, 5-10 parts of silicon nitride powder, 2-5 parts of anionic surfactant, 5-10 parts of antioxidant, 5-10 parts of binder and 20-40 parts of water. The preparation method is simple, the prepared anti-oxidation release agent has good lubrication effect and good stability, the release is easy when the casting is separated from the mold, and the surface of the casting after release has high smoothness.
Description
Technical Field
The invention belongs to the technical field of mold release agents, and relates to an anti-oxidation mold release agent, and a preparation method and a use method thereof.
Background
The automobile industry in China is rapidly developed, and a wide development space is provided for automobile part production and supporting enterprises. In the fierce competition of the world automobile market, all countries develop the direction of high quality, high reliability, light weight, energy saving and low cost. The material is light, and aluminum alloy is used for replacing part of steel (iron) parts so as to meet the requirements of the development of automobiles to high quality and low cost; the method is scientific in process aspect, and the advanced process is used for replacing the traditional process so as to achieve the purposes of improving the precision of the blank, reducing the machining allowance, reducing the consumption of raw materials and reducing the cost. In order to further expand the application of aluminum alloy materials in automobile structures and power assembly systems, the existing preparation method and manufacturing process of aluminum alloy castings are difficult to meet the requirement.
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 release agent is an indispensable auxiliary material in the die-casting production, and the dosage of the release agent is greatly increased due to the rapid development of processes such as injection molding, extrusion, calendaring, die pressing, lamination and the like. However, improper selection and application methods of the release agent directly or indirectly affect the quality and production efficiency of the die casting, and may also have a bad influence on the production environment.
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, and 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.
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 above-mentioned two release agents are treated at a high temperature or left to stand, the components in the release agents are oxidized, resulting in deterioration of the release effect and the lubricating property of the release agents.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide an anti-oxidation release agent which has good lubricating effect and good stability, is easy to release when a casting is separated from a mold, and has high surface smoothness of the casting after being released.
In order to achieve the purpose, the invention adopts the following technical scheme:
an anti-oxidation release agent comprises the following components in parts by weight:
in the invention, volcanic ash is selected as a fireproof and high-temperature resistant material, so that the solidification sequence of the alloy liquid can be effectively promoted; vermiculite and diatomite are selected as heat insulation materials, so that the temperature of the die can be insulated, the alloy is not easy to dissipate heat, the fluidity is good, and the inner cavity of the die can be quickly filled with alloy liquid; titanium dioxide, graphite powder and silicon nitride powder are used as lubricating materials, so that friction and abrasion between a casting and a die can be reduced to the greatest extent, and demolding is facilitated; the antioxidant is selected, so that the stability of the release agent can be effectively improved, and the release agent has better high-temperature stability, shearing stability and room-temperature placing stability; the anionic surfactant is selected as the emulsifier, and can be used for realizing better stability of the release agent under the synergistic action with the antioxidant, and the using amount of the antioxidant can be reduced; the adhesive is selected, so that the powder materials can be uniformly mixed, and the viscosity of the release agent can meet the use requirement; the anti-oxidation release agent has good lubricating effect and good stability, the casting is easy to release when separated from the mold, the surface of the casting after release has high smoothness, and a plurality of castings can be continuously poured.
For example, the anti-oxidation release agent comprises the following components in parts by weight:
20-50 parts of volcanic ash, for example, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts and 50 parts of volcanic ash.
10-30 parts of vermiculite, for example, the parts by weight of the vermiculite are 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 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 diatomite, 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 by weight of diatomite.
5-10 parts of titanium dioxide, for example, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts and 10 parts of titanium dioxide.
2-5 parts of graphite powder, for example, 2 parts, 3 parts, 4 parts and 5 parts of graphite powder.
5-10 parts of silicon nitride powder, for example, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts and 10 parts by weight of silicon nitride powder.
2-5 parts of anionic surfactant, for example, 2 parts, 3 parts, 4 parts and 5 parts of anionic surfactant.
5-10 parts of antioxidant, for example, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts and 10 parts of antioxidant.
5-10 parts of binder, for example, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts and 10 parts of binder.
20-40 parts of water, for example, 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 and 40 parts of water.
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.
Preferably, the anionic surfactant is an anionic surfactant with a dialkyl hydrophobic chain segment, and the surfactant at the hydrophobic end of the dialkyl chain has high dissolving capacity, strong wetting capacity and good permeability, and is helpful for the rapid diffusion of the release agent on the surface of the mold.
In the invention, the antioxidant is a phenol antioxidant and/or an amine antioxidant;
preferably, the phenolic antioxidant is tert-butyl hydroquinone; further preferably, the amine antioxidant is one or a mixture of at least two of naphthylamine, diphenylamine and p-phenylenediamine.
Wherein the binder is an organic binder.
Preferably, the organic binder is a resin binder; further preferably, the resin binder is one or a mixture of at least two of phenolic resin, polyurethane resin and epoxy resin.
The invention also aims to provide a preparation method of the anti-oxidation release agent, which comprises the following steps: weighing 20-50 parts of volcanic ash, 10-30 parts of vermiculite, 10-20 parts of diatomite, 5-10 parts of titanium dioxide, 2-5 parts of graphite powder and 5-10 parts of silicon nitride powder, mixing, uniformly stirring, ball milling, adding 5-10 parts of antioxidant, heating, adding 2-5 parts of anionic surfactant, 5-10 parts of binder and 20-40 parts of water, and continuously stirring to obtain the anti-oxidation release agent.
The stirring time is 2-5 h, for example, the stirring time is 2h, 3h, 4h and 5 h.
Preferably, the ball milling time is 2-5 h, for example, the ball milling time is 2h, 3h, 4h, 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 oxidation preventing release agent after the addition of the binder is 3000 to 8000Pa · s, for example, 3000Pa · s, 4000Pa · s, 5000Pa · s, 6000Pa · s, 7000Pa · s, 8000Pa · s. 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 using method of the anti-oxidation release agent, which is to dilute the anti-oxidation release agent with water and spray the diluted anti-oxidation release agent on the surface of a mold.
Preferably, the method for using the oxidation-preventing release agent of the present invention specifically comprises the steps of:
1) removing impurities from the mould and preheating;
2) diluting the anti-oxidation release agent with water, and spraying the diluted anti-oxidation release agent on the surface of the preheated mold 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 ℃.
In step 2), the mass ratio of the oxidation preventing release agent to the water is preferably (3:7) to (1:4), and for example, the mass ratio of the oxidation preventing release agent to the water is preferably 3:7, 3:8, 3:9, 3:10, 3:11, or 1: 4.
Preferably, in the step 2), the spraying is performed by spraying the anti-oxidation release agent on the surface of the mold by using a spray gun, wherein the air pressure of the spray gun is 4-6 Kg, for example, the air pressure of the spray gun is 4Kg, 4.5Kg, 5Kg, 5.5Kg, 6 Kg; the distance between the spray gun and the mold is 20-25 cm, for example, the distance between the spray gun and the mold is 20cm, 21cm, 22cm, 23cm, 24cm and 25 cm.
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 anti-oxidation release agent has good lubricating and demolding performance and good stability, and still has good demolding performance after high-temperature treatment at 90 ℃; diluting the water-based paint according to the optimal dilution ratio, and stirring for 30min at the stirring speed of 2000r/min, wherein no insoluble substances are separated out from the release agent, so that the water-based paint has good shear stability; after the anti-oxidation release agent is placed at room temperature for 1 month, the release agent has no layering phenomenon, which shows that the anti-oxidation release agent has good room-temperature placing stability.
(2) The anti-oxidation 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 mold by high-speed scouring, and prolongs the service life; meanwhile, the use of the anionic surfactant can increase the fluidity of the release agent, reduce the use amount of the antioxidant, and improve the stability, lubricity and release effect of the release agent under the synergistic effect of the anionic surfactant and the antioxidant.
(3) The anti-oxidation release agent has high chemical stability, the release agent generates less gas in the use temperature range, does not corrode a mould, and does not influence subsequent processes such as painting, electroplating and the like.
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 anti-oxidation 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 anti-oxidation release agent, according to the proportion, volcanic ash, vermiculite, diatomite, titanium dioxide, graphite powder and silicon nitride powder are mixed and stirred for 2 hours to be uniform, then the mixture is ball-milled for 5 hours, an antioxidant is added, the temperature is raised to 60 ℃, then an anionic surfactant, a binder and water are added, the stirring is continued for 3 hours until the viscosity is 4000 Pa.s, and the stirring is stopped, so that the anti-oxidation release agent is obtained.
The prepared anti-oxidation release agent is used for die casting of automobile aluminum alloy hubs, 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 anti-oxidation release agent with water, wherein the mass ratio of the anti-oxidation release agent to the water is 3:7, spraying the anti-oxidation release agent on the surface of the preheated mold in the step 1) by using a spray gun, ensuring the temperature of the mold in the spraying process to be within the range of 200 ℃ during the spraying process, ensuring the air pressure of the spray gun to be 4Kg, ensuring the distance between the spray gun and the mold to be 22cm, and obtaining a release agent coating with the thickness of 160 mu m after the spraying process.
Example 2
The anti-oxidation 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 anti-oxidation release agent, according to the proportion, volcanic ash, vermiculite, diatomite, titanium dioxide, graphite powder and silicon nitride powder are mixed and stirred for 5 hours to be uniform, then the mixture is ball-milled for 3 hours, an antioxidant is added, the temperature is raised to 60 ℃, then an anionic surfactant, a binder and water are added, the stirring is continued for 3 hours until the viscosity is 6000 Pa.s, and the stirring is stopped, so that the anti-oxidation release agent is obtained.
The prepared anti-oxidation release agent is used for die casting of automobile aluminum alloy hubs, and comprises the following steps:
1) cleaning a die with a metal brush, polishing, sandblasting, shot blasting and impurity removal, and preheating at 300 ℃;
2) diluting the anti-oxidation release agent with water, wherein the mass ratio of the anti-oxidation release agent to the water is 3:8, spraying the anti-oxidation release agent on the surface of the preheated mold in the step 1) by using a spray gun, ensuring the temperature of the mold in the spraying process to be within the range of 180 ℃, ensuring the air pressure of the spray gun to be 4.5Kg and the distance between the spray gun and the mold to be 24cm, and obtaining a release agent coating with the thickness of 190 microns after spraying.
Example 3
The anti-oxidation 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 anti-oxidation release agent, according to the proportion, volcanic ash, vermiculite, diatomite, titanium dioxide, graphite powder and silicon nitride powder are mixed and stirred for 4 hours to be uniform, then the mixture is ball-milled for 5 hours, an antioxidant is added, the temperature is raised to 80 ℃, then an anionic surfactant, a binder and water are added, the stirring is continued for 2 hours until the viscosity is 8000 Pa.s, and the stirring is stopped, so that the anti-oxidation release agent is obtained.
The prepared anti-oxidation release agent is used for die casting of automobile aluminum alloy hubs, and comprises the following steps:
1) cleaning a die with a metal brush, polishing, sandblasting and shot blasting impurity removal, and carrying out preheating treatment at 400 ℃;
2) diluting the anti-oxidation release agent with water, wherein the mass ratio of the anti-oxidation release agent to the water is 1:4, spraying the anti-oxidation release agent on the surface of the preheated mold in the step 1) by using a spray gun, ensuring the temperature of the mold in the spraying process to be within the range of 180 ℃, ensuring the air pressure of the spray gun to be 6Kg and the distance between the spray gun and the mold to be 22cm, and obtaining a release agent coating with the thickness of 210 microns after spraying.
Example 4
The anti-oxidation 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 anti-oxidation release agent, according to the proportion, volcanic ash, vermiculite, diatomite, titanium dioxide, graphite powder and silicon nitride powder are mixed and stirred for 2 hours to be uniform, then the mixture is ball-milled for 3 hours, an antioxidant is added, the temperature is raised to 70 ℃, then an anionic surfactant, a binder and water are added, the stirring is continued for 5 hours until the viscosity is 7000 Pa.s, and the stirring is stopped, so that the anti-oxidation release agent is obtained.
The prepared anti-oxidation release agent is used for die casting of automobile aluminum alloy hubs, and comprises the following steps:
1) cleaning a die with a metal brush, polishing, sandblasting, shot blasting and impurity removal, and preheating at 300 ℃;
2) diluting the anti-oxidation release agent with water, wherein the mass ratio of the anti-oxidation release agent to the water is 3:10, spraying the anti-oxidation release agent on the surface of the preheated mold in the step 1) by using a spray gun, ensuring the temperature of the mold in the spraying process to be within the range of 220 ℃, ensuring the air pressure of the spray gun to be 5.5Kg and the distance between the spray gun and the mold to be 24cm, and obtaining a release agent coating with the thickness of 250 micrometers after spraying.
Example 5
The anti-oxidation 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 anti-oxidation release agent, according to the proportion, volcanic ash, vermiculite, diatomite, titanium dioxide, graphite powder and silicon nitride powder are mixed and stirred for 2 hours to be uniform, then the mixture is ball-milled for 2 hours, an antioxidant is added, the temperature is raised to 60 ℃, then an anionic surfactant, a binder and water are added, the stirring is continued for 3 hours until the viscosity is 3000 Pa.s, and the stirring is stopped, so that the anti-oxidation release agent is obtained.
The prepared anti-oxidation release agent is used for die casting of automobile aluminum alloy hubs, 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 anti-oxidation release agent with water, wherein the mass ratio of the anti-oxidation release agent to the water is 3:11, spraying the anti-oxidation release agent on the surface of the preheated mold in the step 1) by using a spray gun, ensuring the temperature of the mold in the spraying process to be within the range of 200 ℃ during the spraying process, ensuring the air pressure of the spray gun to be 6Kg, and ensuring the distance between the spray gun and the mold to be 21cm, and obtaining a release agent coating with the thickness of 180 mu m after the spraying process.
The anti-oxidation release agent prepared in the embodiments 1 to 5 can resist the high temperature of 600 to 800 ℃, has good lubricating effect, is convenient for the separation of a casting and a mold, has good bonding strength, and can continuously pour 1000 castings.
The anti-oxidation release agent prepared in the embodiment 1-5 is placed in a constant temperature oven preheated to 90 ℃, and after high temperature heat treatment, the release agent still has good release property; diluting the water-based paint according to the optimal dilution ratio, and stirring for 30min at the stirring speed of 2000r/min, wherein no insoluble substances are separated out from the release agent, so that the water-based paint has good shear stability; after the anti-oxidation release agent is placed at room temperature for 1 month, the release agent has no layering phenomenon, which shows that the anti-oxidation release agent has good room-temperature placing stability.
Comparative example 1
The difference between the comparative example and the example 1 is that the amount of the volcanic ash in the raw materials is 5 parts, the fineness of the volcanic ash is 50 meshes, the other parts are the same as those in the example 1, and the release agent prepared by the comparative example has poor adhesion and is difficult to separate when a casting is released.
Comparative example 2
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 3
The comparative example is different from example 1 in that the preparation raw material does not contain an antioxidant, and the rest is the same as example 1, and after the mold release agent of the comparative example is sprayed, the cast is difficult to separate from the mold during mold release.
Comparative example 4
The comparative example is different from example 1 in that the antioxidant in the raw material is a benzophenone antioxidant, and the rest is the same as that in example 1, and after the mold release agent of the comparative example is sprayed, the casting is difficult to separate from the mold during mold release, and the surface of the casting is not smooth.
Comparative example 5
The difference between the comparative example and the example 1 is that the raw materials do not contain vermiculite, the rest are the same as those in the example 1, and the release agent prepared by the comparative example has poor fluidity and poor heat preservation effect, and the alloy is easy to dissipate heat.
Comparative example 6
The comparative example is different from example 1 in that no anionic surfactant is added, but in order to obtain the same result as in example 1, the amount of the antioxidant is increased to 30 parts or more, and the amount of the antioxidant is increased.
Comparative example 7
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 8
The comparative example is different from example 1 in that the spraying distance is 5cm in the using method, and the other steps are the same as those of example 1, the release agent rebounds and splashes during spraying, and the loss of the release agent is large.
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 (12)
1. The preparation method of the anti-oxidation release agent is characterized by comprising the following steps of: weighing 20-50 parts of volcanic ash, 10-30 parts of vermiculite, 10-20 parts of diatomite, 5-10 parts of titanium dioxide, 2-5 parts of graphite powder and 5-10 parts of silicon nitride powder, mixing, uniformly stirring, adding 5-10 parts of antioxidant by ball milling, heating, adding 2-5 parts of anionic surfactant, 5-10 parts of binder and 20-40 parts of water, and continuously stirring to obtain the anti-oxidation release agent;
the fineness of the volcanic ash is 300-500 meshes;
the anionic surfactant is an anionic surfactant with a dialkyl hydrophobic chain segment;
the antioxidant is a phenol antioxidant and/or an amine antioxidant;
the phenolic antioxidant is tert-butyl hydroquinone;
the amine antioxidant is one or a mixture of at least two of naphthylamine, diphenylamine and p-phenylenediamine;
the binder is one or a mixture of at least two of organic binder phenolic resin, polyurethane resin and epoxy resin.
2. The preparation method according to claim 1, wherein the stirring time is 2-5 hours.
3. The preparation method according to claim 1 or 2, wherein the time for ball milling is 2-5 h.
4. The method according to claim 1, wherein the temperature of the elevated temperature is 50 to 80 ℃.
5. The production method according to claim 1, wherein the viscosity of the oxidation preventing release agent after stirring after adding the binder is 3000 to 8000 Pa-s.
6. An oxidation-preventing mold release agent obtained by the production method according to any one of claims 1 to 5.
7. The use method of the oxidation-preventing release agent according to claim 6, wherein the oxidation-preventing release agent is diluted with water and sprayed on the surface of a mold.
8. Use according to claim 7, characterized in that it comprises in particular the following steps:
1) removing impurities from the mould and preheating;
2) diluting the anti-oxidation release agent with water, and spraying the diluted anti-oxidation release agent on the surface of the preheated mold in the step 1).
9. The use method according to claim 8, 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.
10. The use method according to claim 8, wherein in the step 1), the preheating temperature is 200-400 ℃.
11. The use according to claim 8, wherein in step 2), the mass ratio of the oxidation preventing release agent to the water is (3:7) to (1: 4).
12. The use method according to claim 8, wherein in the step 2), the anti-oxidation release agent is sprayed on the surface of the mold by a spray gun, the air pressure of the spray gun is 4-6 Kg, and the distance between the spray gun and the mold is 20-25 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810778185.7A CN108907074B (en) | 2018-07-16 | 2018-07-16 | Anti-oxidation release agent and preparation method and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810778185.7A CN108907074B (en) | 2018-07-16 | 2018-07-16 | Anti-oxidation release agent and preparation method and use method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108907074A CN108907074A (en) | 2018-11-30 |
| CN108907074B true CN108907074B (en) | 2020-10-16 |
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| CN109943407A (en) * | 2019-04-10 | 2019-06-28 | 上海福岛新材料科技有限公司 | It is a kind of environmental protection forging use graphitic release agents |
| CN112404341B (en) * | 2020-11-02 | 2022-06-24 | 湖南塑源特科技有限公司 | Molding sand surface spraying agent beneficial to demolding and preparation method thereof |
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| JPH1087856A (en) * | 1996-09-18 | 1998-04-07 | Toto Ltd | Stainproof plastic article and its production |
| JP2005275277A (en) * | 2004-03-26 | 2005-10-06 | Canon Inc | Fixing device |
| CN100558485C (en) * | 2004-08-31 | 2009-11-11 | 株式会社青木科学研究所 | Be used for the oil-based release agent of die casting, method, casting method and the injection unit of setting solvent mixing ratio |
| CN106141075A (en) * | 2016-08-27 | 2016-11-23 | 安徽龙泉硅材料有限公司 | A kind of sand casting releasing agent utilizing precipitated silica to prepare |
| CN107952930A (en) * | 2017-12-04 | 2018-04-24 | 苏州市宽道模具机械有限公司 | A kind of releasing agent and preparation method thereof |
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