JP6749669B1 - Mold release agent containing hollow glass for mold, coating method using the same, and molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold release agent which can be commonly used for casting and forging, has sufficient heat insulating property and lubricity, and is excellent in handleability. The present invention relates to a mold release agent containing hollow glass, a binder, and a solvent. The present invention further preferably is a mold release agent in which the amount of hollow glass blended is 3 to 50 parts by mass. The present invention is further preferably a mold release agent having a hollow glass having a hollow ratio of 25 to 95 parts by volume. [Selection diagram] None

Description

The present invention relates to a hollow glass-containing mold release agent used in a mold in casting and forging of metals such as aluminum, magnesium and zinc, a method for applying the mold release agent, and molding by applying the mold release agent. A method for molding an article.

As is well known, there are methods such as casting, forging, press working, and extrusion working in the process of using a die in working metal. From a process perspective, casting is roughly classified into high pressure casting, gravity casting, low pressure casting, squeeze casting, etc., and forging is roughly divided into cold forging and hot forging. From the viewpoint of the material to be processed, they are roughly classified into ferrous and non-ferrous metals. From the viewpoint of the release agent applied to the mold surface, it is roughly divided into water-soluble release agent and oil-based release agent, and the water-soluble release agent is classified into a transparent solution type and a milky opaque emulsion type. .. From the viewpoint of the components in the release agent, it can be classified into a type containing powder and a type not containing powder. From the viewpoint of coating methods, they are roughly classified into brush coating, droplet dropping, and spraying. The spray can be classified into a two-fluid type and a one-fluid type, and a combination of a non-electrostatic type and an electrostatic type.

Casting is a processing method in which a metal melted at a high temperature (hereinafter referred to as a molten metal) is poured into a mold, cooled and solidified, and then a product is taken out. Since casting can be performed in the same shape by simply pouring the molten metal into the mold, the advantages are that the time required for molding is short and even complicated shapes can be processed relatively easily. Also in terms of cost, it tends to be cheaper than forging. However, in casting, air bubbles (hereinafter referred to as cavities) may occur inside, which causes a decrease in strength.

On the other hand, forging is a processing method of hitting and molding a metal, and when a die is used, the metal is compressed to perform the molding. In forging, since the metal crystals are aligned during the tapping process, it is easy to obtain a molded product with excellent strength. However, the cost tends to be higher than that of casting.

That is, since casting and forging have respective advantages and disadvantages, it is necessary to select a processing method from the viewpoint of the strength required for the product to be manufactured and the production efficiency.

In any of the processing methods, a mold release agent is applied to the mold in order to prevent the metal from sticking to the mold (hereinafter referred to as seizure). However, since the technology related to the metal processing method varies greatly depending on the type, it is common to use different types of release agents in different processing methods.

In order to solve this problem, an oil-based lubricant containing an oil-based lubricant, a solubilizer, an inorganic powder, and water, which can be used in a die for high pressure casting, gravity casting, low pressure casting, and forging, is available. It has been proposed (see Patent Document 1). According to this method, a release agent that can be commonly used in a plurality of processing methods can be obtained.

However, in this release agent, the inorganic powder mainly exhibits the heat insulating property, and it cannot be said that the inorganic powder alone has the sufficient heat insulating property. If the mold release agent does not have sufficient heat insulating properties, the molten metal will solidify before it reaches all corners of the mold during casting, and there will be defective molten metal rotation, and during forging, the temperature of the material (hereinafter referred to as the work) will drop. As a result, the hardness is increased, and the moldability of the product is reduced by either processing method.

JP, 2010-077321, A

The present invention has been made in view of the above circumstances, and provides a release agent that can be commonly used in casting and forging, has excellent handleability, and has excellent heat insulating properties and lubricity. With the goal.

According to the present invention, the above object is achieved by providing [1] to [8].
[1] A release agent containing hollow glass, a binder, and a solvent;
[2] The release agent according to the above [1], wherein the content of the hollow glass is 3 to 50% by mass;
[3] The release agent according to [1] or [2], wherein the hollow glass has a hollowness of 25 to 95% by volume;
[4] The release agent according to any one of [1] to [3], wherein the hollow glass has an average particle size of 10 to 100 μm;
[5] The release agent according to any one of the above [1] to [4], wherein the solvent is one or more solvents selected from the group consisting of water and organic solvents;
[6] The release agent according to any one of [1] to [5], further containing an inorganic powder;
[7] A method of applying the release agent according to any one of [1] to [6] to a mold;
[8] A method of forming a molded article by applying the release agent according to any one of [1] to [6] to a mold.

According to the mold release agent of the present invention, it is possible to form a coating film that can be used for a mold in casting and forging, and has excellent heat insulation and lubricity, and improve the moldability of a molded product. it can.

According to the mold release agent of the present invention, it is possible to have a sufficient heat insulating property with a small amount of application, so by using the mold release agent of the present invention during casting, it is possible to reduce the occurrence of porosity in the molded product. The quality of the molded product can be improved. Further, since it has a sufficient heat insulating property with a small amount of coating, it does not flow down from the mold and mix into the wastewater, and the wastewater treatment is facilitated, which is environmentally excellent. Further, since the coating has a sufficient heat insulating property with a smaller amount of coating than the conventional release agent, it is possible to reduce the manufacturing cost and improve the productivity.

It is a graph which shows the relationship between elapsed time and temperature data in a heat retention test using a mold release agent for casting. It is the whole figure and sectional view of the device used for the heat retention test using the mold release agent for casting. It is a graph which shows the relationship between elapsed time and temperature data in a heat retention test using a mold release agent for casting. It is a graph which shows the relationship between elapsed time and temperature data in a heat retention test using a mold release agent for casting. It is a graph which shows the relationship between elapsed time and temperature data in a heat retention test using a mold release agent for casting. It is a graph which shows the relationship between elapsed time and temperature data in a heat retention test using a mold release agent for casting. It is a graph which shows the relationship between elapsed time and temperature data in a heat retention test using a mold release agent for casting. It is a graph which shows the relationship between elapsed time and temperature data in a heat retention test using a mold release agent for forging. It is a schematic diagram of the apparatus used for the heat retention test using the mold release agent for forging. It is photograph data of the surface of an aluminum test piece in a moldability test using a mold release agent for forging. It is a schematic diagram of the apparatus used for the moldability test using the mold release agent for forging.

<Release agent>
According to the release agent of the present invention, it is possible to form a coating film having excellent heat insulating properties and lubricity, and improve the metal formability. Further, the release agent of the present invention can form a metal with a small amount of application, and can reduce the environmental load, reduce the manufacturing cost, and improve the productivity. Hereinafter, the release agent of the present invention will be described in detail.

The release agent of the present invention is a composition containing hollow glass, a binder, and a solvent. When the release agent has the above composition, a coating film having excellent heat insulating properties and lubricity can be formed, and the moldability of the metal can be improved.

a) Hollow glass The hollow glass of the present invention is substantially spherical and has a cavity inside. Since the hollow glass has a cavity inside, the release agent of the present invention can exhibit excellent heat insulating properties. Since the hollow glass has a very excellent heat insulating property, the release agent of the present invention can form a coating film having a sufficient heat insulating property with a small amount of coating. In addition, since the surface of the hollow glass is smooth, the hollow glass is unlikely to aggregate in the release agent and is easily dispersed uniformly throughout the coating film. Therefore, according to the release agent of the present invention, it is possible to uniformly form a coating film having a high heat insulating property on the entire mold.

Furthermore, since the hollow glass of the present invention is substantially spherical and has sufficient strength, it is considered that the release agent of the present invention can exhibit excellent lubricity. This is because the work is slippery because the hollow glass has a substantially spherical shape, and when the work is slipping because the hollow glass has sufficient strength, the inorganic powder other than the hollow glass in the mold release agent causes the work and the mold to die. It is presumed that this is because they are held and supplied at the lubrication interface with

The type of glass used for the hollow glass is not particularly limited, soda lime borosilicate glass, borosilicate glass, sodium borosilicate glass, aluminosilicate glass, ceramic, silicate glass, soda lime glass, potassium lime glass, potassium lead. Examples thereof include glass, and soda lime borosilicate glass, borosilicate glass, sodium borosilicate glass, and the like are preferable because they are easily available.

The content of the hollow glass is preferably 50% by mass or less, more preferably 40% by mass or less, and further preferably 30% by mass or less, based on the total amount of the release agent. Further, the content of the hollow glass is preferably 3% by mass or more, more preferably 8% by mass or more, and further preferably 10% by mass or more, based on the total amount of the release agent. When the content of the hollow glass is within the above range, it is easy to obtain a release agent that is excellent in heat insulation and handling, and that can be easily applied to the mold.

In the case of a water-soluble release agent, the content of the hollow glass is preferably 85% by mass or less, more preferably 60% by mass or less, and more preferably 50% by mass with respect to the nonvolatile content of the release agent. % Or less is more preferable. Further, in the case of a water-soluble release agent, the content of the hollow glass is preferably 25% by mass or more, more preferably 28% by mass or more, and 30% by mass based on the nonvolatile content of the release agent. % Or more is more preferable. In the case of an oil-based releasing agent, the content of the hollow glass is preferably 80% by mass or less, more preferably 60% by mass or less, and 50% by mass or less, based on the nonvolatile content of the releasing agent. It is more preferable that there is. In the case of an oil-based mold release agent, the content of the hollow glass is preferably 10% by mass or more, more preferably 15% by mass or more, and 20% by mass with respect to the nonvolatile content of the mold releasing agent. It is more preferable that the above is satisfied. When the content of the hollow glass is within the above range, it is easy to obtain a mold release agent which is excellent in heat insulation and handling and which can be easily applied to the mold.

The hollowness of the hollow glass of the present invention is preferably 95% by volume or less, more preferably 85% by volume or less, and further preferably 80% by volume or less. The hollow rate of the hollow glass is preferably 25% by volume or more, more preferably 40% by volume or more, and further preferably 60% by volume or more. When the hollow ratio of the hollow glass is within the above range, it becomes easy to obtain a release agent having excellent heat insulating properties.

The average particle size of the hollow glass is preferably 100 μm or less, more preferably 70 μm or less, and further preferably 50 μm or less. Furthermore, the average particle size of the hollow glass is preferably 10 μm or more, more preferably 15 μm or more, and further preferably 20 μm or more. When the average particle diameter of the hollow glass is within the above range, it is easy to obtain a mold release agent that is excellent in heat insulation properties and that is capable of forming a metal having a fine structure and capable of forming a thin film.

The average particle diameter of the hollow glass can be measured by a method such as a laser diffraction/scattering method or an image analysis method.

b) Binder The binder of the present invention is for connecting the hollow glass and other particles contained in the release agent to increase the strength of the coating film. In the case of a binder used for a water-soluble release agent, examples of the binder include silicates, phosphates, carbonates, polyvalent metal alkoxides, etc., but they are relatively inexpensive. , Sodium silicate and the like are preferable. In the case of the binder used in the oily release agent, for example, natural resins such as cellulose and rosin, polybutene, polyethylene, polypropylene, polystyrene, polycarbonate, polyvinyl chloride, polyvinyl acetate, polyamide, acrylic resin, polyethylene terephthalate, fluorine. Resin, silicone resin, polyester resin, acetal resin, butyral resin, linseed oil and other vegetable oils can be mentioned, but because of their good solubility in oily solvents, they are hydrocarbon polymers (organic consisting mainly of carbon and hydrogen. A compound, which may contain oxygen).

In the case of a water-soluble release agent, the content of nonvolatile components in the binder is preferably 35% by mass or less, more preferably 30% by mass or less, and 25% by mass with respect to the nonvolatile content of the release agent. % Or less is more preferable. Further, in the case of a water-soluble release agent, the content of nonvolatile components in the binder is preferably 3% by mass or more, more preferably 4% by mass or more, based on the nonvolatile components in the release agent. It is more preferably 5% by mass or more. Further, in the case of an oil-based mold release agent, the content of nonvolatile components in the binder is preferably 35% by mass or less, more preferably 30% by mass or less, and more preferably 25% by mass or less with respect to the nonvolatile components in the mold releasing agent. It is more preferable that the content is not more than mass %. Further, in the case of an oil-based mold release agent, the content of nonvolatile components in the binder is preferably 3% by mass or more, more preferably 4% by mass or more, with respect to the nonvolatile components in the mold releasing agent. More preferably, it is at least mass %. When the content of the binder is within the above range, it becomes easy to obtain a release agent capable of forming a coating film having higher strength.

c) Solvent The solvent of the present invention is preferably one or more selected from the group consisting of water and organic solvents. The organic solvent includes alcohol, petroleum hydrocarbon solvent and the like. In the case of a water-soluble mold release agent, a highly polar one such as water and/or alcohol is used as a main solvent, and in the case of an oily mold release agent, a main solvent is a petroleum hydrocarbon solvent, etc. It is preferable to use those having low polarity. The release agent of the present invention can exhibit an excellent heat insulating effect as a water-soluble release agent, an oil-based release agent, or any type of release agent. Therefore, it is possible to select the most suitable solvent in consideration of the circumstances such as the coating device and the waste water facility to be used.

Examples of alcohols include isopropyl alcohol, ethanol, butanol, isobutanol, normal propyl alcohol, tertiary butanol, secondary butyl alcohol, 1,3-butanediol, 1,4-butanediol, 2-ethylhexanol, and benzyl alcohol. However, isopropyl alcohol, ethanol and the like are preferable because of easy availability.

Examples of the petroleum hydrocarbon solvent include paraffin hydrocarbon solvent, olefin hydrocarbon solvent, naphthene hydrocarbon solvent, aromatic hydrocarbon solvent and mineral hydrocarbon solvent.

The paraffinic hydrocarbon solvent is a solvent that contains a chain-like saturated hydrocarbon compound that is not cyclic. Compared to other hydrocarbon solvents, it is less likely to cause health problems for workers and the viscosity changes with temperature. Few. Therefore, when the paraffinic hydrocarbon solvent is used as the solvent for the release agent, the release agent can be applied stably. Further, the paraffinic hydrocarbon solvent has low reactivity and high chemical stability as compared with other hydrocarbon solvents. Therefore, when a paraffinic hydrocarbon solvent is used as a solvent for the mold release agent, other components in the mold release agent are less likely to deteriorate. Examples of the paraffinic hydrocarbon solvent include alkane solvents such as heptane, octane, nonane, decane, undecane, dodecane, tridecane, tetradecane, and pentadecane.

The olefinic hydrocarbon solvent is a solvent containing a hydrocarbon compound having a double bond. Examples of the olefinic hydrocarbon solvent include 1-heptene, 1-octene, 1-nonene, 1-decene, and the like.

The naphthene-based hydrocarbon solvent is a solvent containing a compound having at least one saturated aliphatic ring in the molecule, and has a property that it has a higher drying property than an aromatic hydrocarbon solvent described later. Examples of the naphthene-based hydrocarbon solvent include cyclopentane, cyclohexane, cyclooctane, and the like.

The aromatic hydrocarbon solvent is a solvent containing a compound having at least one aromatic ring in the molecule. Examples of the aromatic hydrocarbon solvent include toluene and xylene.

Among these petroleum hydrocarbon solvents, it is preferable to use paraffinic hydrocarbon solvents and the like from the viewpoints of health problems for workers, chemical stability, and the like.

As the hydrocarbon solvent, the above solvents may be used alone or in combination. Further, the hydrocarbon solvent may contain additives, impurities and the like within a range not deviating from the gist of the present invention.

In the case of a water-soluble release agent, the content of the solvent is preferably 90% by mass or less, more preferably 80% by mass or less, and 70% by mass or less with respect to the total amount of the releasing agent. It is more preferable that there is. Further, in the case of a water-soluble release agent, the content of the solvent is preferably 35% by mass or more, more preferably 45% by mass or more, and 50% by mass with respect to the total amount of the release agent. It is more preferable that the above is satisfied. In the case of an oil-based mold release agent, the content of the solvent is preferably 90% by mass or less, more preferably 80% by mass or less, and 70% by mass or less based on the total amount of the mold releasing agent. Is more preferable. Further, in the case of an oily release agent, the content of the solvent is preferably 40% by mass or more, more preferably 30% by mass or more, and 20% by mass or more with respect to the total amount of the releasing agent. Is more preferable. When the content of the solvent is within the above range, it is easy to obtain a release agent that is excellent in handleability and can be easily applied to the mold.

d) Inorganic powder and others The release agent of the present invention preferably further contains an inorganic powder other than hollow glass. It has been confirmed that inorganic powders other than hollow glass do not easily deteriorate at high temperatures, maintain a thick coating film, and exhibit heat insulation properties. Also, it is effective in reducing the work deformation pressure, and the formability can be improved.

Examples of the inorganic powder other than the hollow glass, for example, talc, titanium oxide, mica, mica, clay, silica, refractory mortar, boronite, fluororesin, sericite, borate, alumina powder, pyrophosphate, Examples thereof include baking soda, titanium oxide, red iron oxide, radiolite, zirconium oxide, graphite, carbon black, sodium adipate, and the like, and talc, titanium oxide, graphite, etc. are preferable because they are inexpensive.

In the case of a water-soluble release agent, the content of the inorganic powder other than the hollow glass is preferably 60% by mass or less and more preferably 40% by mass or less based on the nonvolatile content of the releasing agent. .. Furthermore, in the case of a water-soluble mold release agent, the content of the inorganic powder other than the hollow glass is preferably 0% by mass or more, and more preferably 20% by mass or more, based on the nonvolatile content of the mold releasing agent. More preferable. In the case of an oil-based mold release agent, the content of the inorganic powder other than the hollow glass is preferably 60% by mass or less, and more preferably 40% by mass or less, based on the nonvolatile content of the mold releasing agent. preferable. Further, in the case of an oil-based mold release agent, the content of the inorganic powder other than the hollow glass is preferably 0% by mass or more, and more preferably 20% by mass or more, based on the nonvolatile content of the mold release agent. preferable. When the content of the inorganic powder other than the hollow glass is within the above range, it becomes easy to obtain a release agent that is resistant to deterioration at high temperatures and that can form a coating film having excellent heat insulating properties.

The release agent of the present invention includes additives such as an antioxidant, a metal deactivator, a rust preventive, a thickener, or a defoaming agent, etc. within a range not departing from the spirit of the present invention. May be.

<Method of applying release agent to mold>
The method of applying the mold release agent of the present invention to the mold is not particularly limited as long as it is a method of applying the mold release agent to the mold, and examples thereof include brush coating, roller coating, droplet dropping, and spray coating. Can be given. Brush coating or roller coating is suitable from the viewpoint of thickly applying the release agent to the mold, but the thickness of the coating film formed by the release agent tends to be uneven. Further, it tends to be difficult to apply a brush or a roller coating to a small mold or a mold having a fine structure. Therefore, when the mold release agent is applied to the mold, spray application is preferable. Examples of spray coating include hand spraying and automatic spraying by a device. From the viewpoint of productivity, automatic spraying by a device is preferable. Examples of automatic spray coating by the apparatus include a combination of a two-fluid system and a one-fluid system, and a non-electrostatic type and an electrostatic type. The release agent used for electrostatic coating must have an electrical conductivity suitable for coating, but according to the release agent of the present invention, by arbitrarily selecting the composition of the solvent, Since it is possible to adjust the electric conductivity of the release agent, it is possible to select without problems by any coating method.

<Molding method in which mold release agent is applied to mold>
The mold releasing agent of the present invention is applied to a mold, and the method for molding a molded product is not particularly limited as long as it is a molding method using a mold, and methods such as casting, forging, pressing, and extrusion processing Can be given. Examples of casting include high pressure casting, gravity casting, low pressure casting, squeeze casting and the like, and examples of forging include cold forging, warm forging, hot forging and the like. According to the release agent of the present invention, a coating film having excellent heat insulating properties can be formed by any molding method.

Hereinafter, the release agent of the present invention will be described in detail with reference to Examples and Comparative Examples. The present invention is not limited to the following embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiments. Some components may be deleted from all the components shown in the embodiment. Furthermore, the constituent elements may be appropriately combined so as to obtain different embodiments.

(Example 1)
<Preparation of water-soluble release agent>
Water 64.5 parts by mass, hollow glass (made of sorter lime borosilicate glass, true density 0.60 g/cm ³ , particle diameter 30 μm) 30 parts by mass, sodium silicate (Na ₂ O.nSiO ₂ .xH ₂ O) 5 A water-soluble release agent-1 was obtained by mixing 3 parts by mass of xanthan gum (polysaccharide composed of mannose, glucose and glucuronic acid) with 0.5 parts by mass.

The water-soluble release agent-1 was applied to the mold so that the thickness of the coating film after drying was 50 μm, and the following heat retention test was conducted. The graph of the temperature data recorded in the heat retention test is shown in FIG. 1, and the maximum temperature recorded in the heat retention test and the time to reach the maximum temperature are shown in Table 1.

<Heat retention test of coating film of mold release agent for casting>
The heat retention test of the coating film of the release agent used for casting was conducted as follows. FIG. 2A is an overall view of a heat retention test of a coating film of a release agent used for casting, and FIG. 2B is an overall view of a line segment of XX shown in FIG. It is sectional drawing when it cut|disconnects by. Inside the mold 1 (material: SKD61, length 200 mm, width 200 mm, height 30 mm), the thermocouple 2 was installed so that the tip of the thermocouple 2 was located 1 mm below the surface of the mold 1. .. The tip of the thermocouple 2 was positioned at the center of the ring 4 described later. First, the mold 1 was heated to 200 to 250°C. Next, a mold release agent was applied to the surface of the mold 1 by spray coating. At this time, the coating film 3 of the release agent was formed while measuring the thickness of the coating film by using an electromagnetic film thickness meter (LE-300J, manufactured by KET Scientific Co., Ltd.). A ring 4 (inner diameter 78 mm) was placed on the mold 1 on which the coating film 3 of the release agent was formed, and after confirming that the surface temperature of the mold 1 was 200° C., an aluminum melt 5 of 670° C. 5 250 g (JIS standard: ADC12) was put into the ring 4. The temperature sensed by thermocouple 2 was recorded every 50 ms.

(Comparative example 1)
Water 74.5 parts by mass, talc (average particle size 4.5 μm) 20 parts by mass, sodium silicate (Na ₂ O.nSiO ₂ .xH ₂ O) 5 parts by mass, xanthan gum (mannose, glucose, glucuronic acid) Water-soluble release agent-2 was obtained by mixing 0.5 parts by mass of the polysaccharide). With respect to the obtained water-soluble release agent-2, a coating film was prepared in the same manner as in Example 1 and a heat retention test was conducted. The graph of the temperature data recorded in the heat retention test is shown in FIG. 1, and the maximum temperature recorded in the heat retention test and the time to reach the maximum temperature are shown in Table 1.

(Example 2)
A coating film was prepared in the same manner as in Example 1 except that the release agent was coated on the mold so that the thickness of the coating film after drying was 100 μm, and a heat retention test was conducted. A graph of the temperature data recorded in the heat retention test is shown in FIG. 3, and the maximum temperature recorded in the heat retention test and the time to reach the maximum temperature are shown in Table 1.

(Comparative example 2)
A coating film was prepared in the same manner as in Example 2 except that the water-soluble release agent-2 was used instead of the water-soluble release agent-1, and a heat retention test was conducted. A graph of the temperature data recorded in the heat retention test is shown in FIG. 3, and the maximum temperature recorded in the heat retention test and the time to reach the maximum temperature are shown in Table 1.

(Example 3)
As a hollow glass, a water-soluble release agent-3 was prepared in the same manner as the water-soluble release agent-1 except that a borosilicate glass having a true density of 1.10 g/cm ³ and a particle diameter of 12 μm was used. Obtained. A coating film was prepared from the obtained water-soluble release agent-3 in the same manner as in Example 2, and a heat retention test was conducted. The graph of the temperature data recorded in the heat retention test is shown in FIG. 4, and the maximum temperature recorded in the heat retention test and the time to reach the maximum temperature are shown in Table 1.

From FIG. 1, FIG. 3, and Table 1, the maximum temperature recorded in the heat retention test of the water-soluble release agent-1 was lower than that of the water-soluble release agent-2, and the time at which the maximum temperature was reached was low. Turns out to be slow. This means that the water-soluble mold release agent-1 was superior in heat retaining property to the water-soluble mold release agent-2, and therefore the heat transfer from the molten aluminum 5 to the mold 1 was small. doing.

Moreover, from FIG. 1, FIG. 3, and Table 1, the water-soluble mold release agent-1 makes the maximum temperature recorded in the heat retention test increase by increasing the thickness of the coating film after drying from 50 μm to 100 μm. You can see that you can lower it. On the other hand, it can be seen that the water-soluble release agent-2 shows almost no change in the maximum temperature recorded in the heat retention test even when the thickness of the coating film after drying is increased from 50 μm to 100 μm. That is, the water-soluble release agent-1 can exhibit higher heat retention by increasing the thickness of the coating film after drying.

As shown in FIG. 4 and Table 1, the water-soluble mold release agent-3, like the water-soluble mold release agent-1, has the highest temperature recorded in the heat retention test as compared with the water-soluble mold release agent-2. It can be seen that is low and the time to reach the maximum temperature is slow. This is because the water-soluble mold release agent-3, like the water-soluble mold release agent-1, is superior in heat retention as compared with the water-soluble mold release agent-2. It means that the heat transfer to 1 was small.

(Example 4)
<Preparation of oily release agent>
62 parts by mass of isoparaffin (flash point 95° C.), 30 parts by mass of hollow glass (made of sorter lime borosilicate glass, true density 0.60 g/cm ³ , particle size 30 μm), dry vegetable oil (linseed oil, iodine value 110 or more) 0 0.5 parts by mass, hydrocarbon polymer (average molecular weight 2650) 2 parts by mass, oxidized polyethylene wax (average particle size 6 μm, melting point 115° C.) 0.5 parts by mass, organic clay (organic modified bentonite, oreganophyllosilicate) 5 An oil-based mold release agent-1 was obtained by mixing parts by mass.

With respect to the obtained oil-based mold release agent-1, a coating film was prepared in the same manner as in Example 1 and a heat retention test was conducted. A graph of the temperature data recorded in the heat retention test is shown in FIG. 5, and the maximum temperature recorded in the heat retention test and the time to reach the maximum temperature are shown in Table 2.

(Comparative example 3)
74 parts by mass of isoparaffin (flash point 95° C.), 0.5 parts by mass of dry vegetable oil (linseed oil, iodine value of 110 or more), 2 parts by mass of hydrocarbon polymer (average molecular weight 2650), oxidized polyethylene wax (average particle size 6 μm, melting point) 115° C.) 0.5 parts by mass, organic clay (organic modified bentonite, oreganophyllosilicate) 3 parts by mass, talc (average particle size 4.5 μm) 10 parts by mass, calcium carbonate (surface-modified calcium carbonate, specific surface area) 2500 cm ² /g) 10 parts by mass was mixed to obtain an oily release agent-2. With respect to the obtained oil-based mold release agent-2, a coating film was prepared in the same manner as in Example 4, and a heat retention test was conducted. A graph of the temperature data recorded in the heat retention test is shown in FIG. 5, and the maximum temperature recorded in the heat retention test and the time to reach the maximum temperature are shown in Table 2.

(Example 5)
A coating film was prepared in the same manner as in Example 4 except that the release agent was coated on the mold so that the thickness of the coating film after drying was 100 μm, and the heat retention test was performed. FIG. 6 shows a graph of the temperature data recorded in the heat retention test, and Table 2 shows the maximum temperature recorded in the heat retention test and the time when the maximum temperature was reached.

(Comparative example 4)
A coating film was prepared in the same manner as in Example 5 except that the oil-based mold release agent-1 was replaced with the oil-based mold release agent-2, and a heat retention test was conducted. FIG. 6 shows a graph of the temperature data recorded in the heat retention test, and Table 2 shows the maximum temperature recorded in the heat retention test and the time when the maximum temperature was reached.

(Example 6)
Oil-based mold release agent-3 was obtained in the same manner as in Example 3 except that borosilicate glass having a true density of 1.10 g/cm ³ and a particle diameter of 12 μm was used as the hollow glass. With respect to the obtained oil-based mold release agent-3, a coating film was prepared in the same manner as in Example 5, and a heat retention test was conducted. A graph of the temperature data recorded in the heat retention test is shown in FIG. 7, and the maximum temperature recorded in the heat retention test and the time to reach the maximum temperature are shown in Table 2.

From FIG. 5, FIG. 6, and Table 2, the oil-based mold release agent-1 has a lower maximum temperature and a longer time to reach the maximum temperature in the heat retention test, as compared with the oil-based mold release agent-2. I understand. This means that the oil-based mold releasing agent-1 was superior in heat retaining property to the oil-based mold releasing agent-2, and therefore the heat transfer from the molten aluminum 5 to the mold 1 was small. There is.

Moreover, from FIG. 5, FIG. 6, and Table 2, the oil-based mold release agent-1 makes the maximum temperature recorded in the heat retention test better by increasing the thickness of the coating film after drying from 50 μm to 100 μm. You can see that it is low. On the other hand, it can be seen that the oil-based mold release agent-2 hardly changes the maximum temperature recorded in the heat retention test even when the thickness of the coating film after drying is increased from 50 μm to 100 μm. That is, the oil-based mold release agent-1 can exhibit higher heat retention by increasing the thickness of the coating film after drying.

From FIG. 7 and Table 2, the oil-based mold release agent-3, like the oil-based mold release agent-1, has a lower maximum temperature recorded in the heat retention test as compared with the oil-based mold release agent-2. It can be seen that the time to reach the maximum temperature is slow. This is because the oil-based mold release agent-3 is superior to the oil-based mold release agent-2 in heat retention as in the case of the oil-based mold release agent-1. This means that there was little heat transfer.

(Example 7)
<Preparation of oily release agent>
59.5 parts by mass of isoparaffin (flash point 95° C.), 10 parts by mass of hollow glass (made of sorter lime borosilicate glass, true density 0.60 g/cm ³ , particle size 30 μm), graphite (scaly graphite, average particle size 4. 0 μm) 10 parts by mass, sodium adipate 5 parts by mass, fatty acid amide (higher fatty acid amide) 5 parts by mass, cationic group-containing polymer (cationic group-containing acrylic polymer, amine value 10) 0.5 part by mass, dry vegetable oil (linseed oil) , Iodine value 110 or more) and 5 parts by mass of a hydrocarbon polymer (average molecular weight 2650) were mixed to obtain an oil-based mold release agent-4.

The oil-based mold release agent-4 was applied to the mold, and the following heat retention test was conducted. FIG. 8 shows a graph of temperature data recorded in the heat retention test, and Table 3 shows the temperature 120 seconds after the start of measurement and the temperature lowered by 120 seconds after the start of measurement.

<Heat retention test of coating film of release agent for forging>
The heat retention test of the coating film of the release agent used for forging was performed as follows. FIG. 9 is a schematic diagram of a heat retention test of a coating film of a release agent used for casting. First, the mold 13 (material: SKD-61, diameter 200 mm, height 50 mm) installed in the die base 12 in which the cartridge heater 11 was embedded was heated to 250°C. Next, 10 ml of the release agent was applied to the surface of the mold 13 by spray coating to form a release agent coating film 14. A hole was opened in the center of the aluminum test piece 15 (A2011, diameter 43 mm, height 40 mm), and the thermocouple 16 was installed so that the tip of the thermocouple 16 was within 20 mm from the upper surface. The aluminum test piece 15 was put in a constant temperature bath, and when the temperature of the aluminum test piece 15 reached 480° C. or higher, the aluminum test piece 15 was taken out from the constant temperature bath. When the temperature of the aluminum test piece 15 reached 470° C., the aluminum test piece 15 was placed in the center of the release agent coating film 14, and the temperature sensed by the thermocouple 16 was recorded every 50 milliseconds.

(Comparative example 5)
Isoparaffin (flash point 95° C.) 62 parts by mass, graphite (scaly graphite, average particle size 4.0 μm) 20 parts by mass, sodium adipate 5 parts by mass, fatty acid amide (higher fatty acid amide) 2.5 parts by mass, containing cationic group By mixing 0.5 parts by mass of a polymer (cationic group-containing acrylic polymer, amine value 10), 5 parts by mass of dry vegetable oil (linseed oil, iodine value of 110 or more), 5 parts by mass of a hydrocarbon polymer (average molecular weight 2650), Oily release agent-5 was obtained. With respect to the obtained oil-based mold release agent-5, a coating film was prepared in the same manner as in Example 7, and a heat retention test was conducted. FIG. 8 shows a graph of temperature data recorded in the heat retention test, and Table 3 shows the temperature 120 seconds after the start of measurement and the temperature lowered by 120 seconds after the start of measurement.

(Comparative example 6)
A heat retention test was conducted in the same manner as in Example 7 except that the mold release agent was not applied. FIG. 8 shows a graph of temperature data recorded in the heat retention test, and Table 3 shows the temperature 120 seconds after the start of measurement and the temperature lowered by 120 seconds after the start of measurement.

From FIG. 8 and Table 3, the temperature of the oil-based mold release agent-4 is higher after 120 seconds from the start of measurement, as compared with the oil-based mold release agent-5 and the case where the mold release agent is not applied. It can be seen that the temperature lowered by 120 seconds after the start of measurement is low. This is because the oil-based mold release agent-4 is superior in heat retention property to the oil-based mold release agent-5 and compared to the case where the mold release agent is not applied. This means that the heat transfer to the mold 13 was small.

(Example 8)
The oil-based mold release agent-4 was applied to the mold, and the following moldability test was conducted. The load data recorded in the formability test is shown in Table 4, and the photographic data of the surface of the aluminum test piece after the formability test is shown in FIG.

<Formability test of release agent for forging>
The moldability test of the release agent used for forging was performed as follows. FIG. 11 is a schematic diagram of a moldability test of a mold release agent for forging. The moldability test was performed using a 100-ton hydraulic press machine (manufactured by Iwaki Kogyo Co., Ltd.) equipped with die bases 22 in which cartridge heaters 21 were embedded above and below the inside of the press section. A mold 23 (material: SKD-61, diameter 200 mm, height 50 mm) was installed on each of the upper and lower die bases 22, and the temperature of the mold 23 during the moldability test was maintained at 350° C. by the cartridge heater 21. A release agent coating film 24 was formed by spray-applying a release agent of 2 ml on each of the upper and lower molds. The aluminum test piece 25 (material: A-6061, diameter 30 mm, height 40 mm) heated to 450° C. in a constant temperature bath was installed in the lower part of the press surface, and the aluminum test piece 25 was compressed by raising the lower part of the press surface. The compressive load when the lower part of the press surface was raised to a predetermined position was measured and recorded by the load cell 26 (CS-100T manufactured by Aiko Engineering Co., Ltd.). Further, the presence or absence of image sticking on the surface of the aluminum test piece 25 after compression was visually confirmed.

(Example 9)
Isoparaffin (flash point 95° C.) 49.5 parts by mass, hollow glass (made of sorter lime borosilicate glass, true density 0.60 g/cm ³ , particle size 30 μm) 10 parts by mass, graphite (scaly graphite, average particle size 4. 0 μm) 20 parts by mass, sodium adipate 5 parts by mass, fatty acid amide (higher fatty acid amide) 5 parts by mass, cationic group-containing polymer (cationic group-containing acrylic polymer, amine value 10) 0.5 part by mass, dry vegetable oil (linseed oil) , Iodine value 110 or more) and 5 parts by mass of a hydrocarbon polymer (average molecular weight 2650) were mixed to obtain an oil-based mold release agent-6. A coating film was formed on the obtained oil-based mold release agent-6 in the same manner as in Example 8, and a moldability test was conducted. The load data recorded in the formability test is shown in Table 4, and the photographic data of the surface of the aluminum test piece after the formability test is shown in FIG. 10(b).

(Comparative Example 7)
A coating film was formed and a moldability test was conducted in the same manner as in Example 8 except that the oil-based mold release agent-5 was used instead of the oil-based mold release agent-4. The load data recorded in the formability test is shown in Table 4, and the photographic data of the surface of the aluminum test piece after the formability test is shown in FIG.

From Table 4, the oil-based mold release agent-4 and the oil-based mold release agent-6 have smaller compressive loads when the lower part of the press surface is raised to a predetermined position as compared with the oil-based mold release agent-5. I understand. This means that the oil-based mold release agent-4 and the oil-based mold release agent-6 are superior in lubricity as compared with the oil-based mold release agent-5, so that a molded product can be molded with a small load. doing.

Further, from FIG. 10, when the aluminum test piece 25 was molded using the oil-based mold release agent-4 and the oil-based mold release agent-6, seizure did not occur on the surface of the molded aluminum test piece 25. On the other hand, when the aluminum test piece 25 was molded using the oil-based mold release agent-5, it was found that seizure occurred on the surface of the molded aluminum test piece 25. This is because the oil-based mold release agent-4 and the oil-based mold release agent-6 are superior in lubricity as compared with the oil-based mold release agent-5, so that it is possible to mold a molded product without seizure of the surface. I mean.

1 mold 2 thermocouple 3 coating film 4 ring 5 molten aluminum 11 cartridge heater 12 die base 13 mold 14 coating film 15 aluminum test piece 16 thermocouple 21 cartridge heater 22 die base 23 mold 24 release agent coating film 25 aluminum test piece 26 load cell

Claims (9)

Including hollow glass, binder, and solvent,
Release agent for casting and forging . The content of the hollow glass is 3 to 50% by mass,
The mold releasing agent for casting and forging according to claim 1. The hollow rate of the hollow glass is 25 to 95% by volume,
The mold releasing agent for casting and forging according to claim 1 or 2. The average particle diameter of the hollow glass is 10 to 100 μm,
The mold releasing agent for casting and forging according to claim 1. The solvent is water, and one or more solvents selected from the group consisting of organic solvents,
The mold release agent for casting and forging according to any one of claims 1 to 4. Furthermore, including inorganic powder,
The mold releasing agent for casting and forging according to claim 1. The content of the solvent is 20 to 90% by mass,
The mold releasing agent for casting and forging according to any one of claims 1 to 6. How casting according to any one of claims 1 to 7, and a forging mold release agent is applied to the mold. A method of applying a mold release agent for casting and forging according to any one of claims 1 to 8 to a mold to form a molded product.