JP2001150424A - Form releasing agent for concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a form releasing agent capable easily and smoothly releasing a concrete molding from a form and having a protective function of the molding surface of the molding. SOLUTION: The form releasing agent for concrete has a dry film of a dropping point of 50 deg.C to 100 deg.C formed on the surface of a form for concrete. The agent contains a montanic acid wax having an acid value of 40 or less and obtained by dispersing the wax in water through a nonionic surfactant as an essential component. The film is transferred to the surface of a molding when the molding is released from the form.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete mold release agent for easily releasing a concrete molded product from a concrete molded mold.

[0002]

2. Description of the Related Art Mold release agents for concrete include oil-based release agents such as mineral oil, animal oil, vegetable oil, fatty acid metal soap, and the like, which are dispersed in water via a surfactant. Type release agent, synthetic resin wax, carnauba wax, montan wax, dissolution type release agent in which these alkali metal soaps are dissolved in a solvent, and water in which these metal soaps are dispersed in water via a surfactant Various types of release agents such as a dispersion type release agent are known.

[0003]

The first characteristic required for a mold release agent for concrete is that the concrete molded product can be easily and smoothly released from the mold, and the concrete molded product can be easily and smoothly released from the mold. Is to be able to ensure the smoothness of the molding surface of the other, as other characteristics, not to discolor the molding surface of the concrete molding,
Examples of the method include not leaving concrete adhering matter (slag) on the mold, not generating rust on the mold, and stabilizing the liquid properties of the release agent itself.

[0004] In conventional release agents, both oil-based and water-dispersed types are liable to undergo discoloration due to oxidation of oil. In addition, in a water-dispersed type in which metal soap obtained by reacting montan wax or carnauba wax with little discoloration with sodium hydroxide, potassium hydroxide, or the like is dispersed in water, the main component is a metal soap, so that the mold is released. The drop point of the film formed by the agent is high, and the generation of slag tends to increase more than that of the oil type.

[0005] In addition, when montan wax, which is a polymer compound having poor affinity for water, is dispersed in water due to the surface activity of a metal soap formed using its acid value,
The dispersion liquid is easily gelled and it is difficult to maintain stable liquid properties.
This is because the acid value of the montan wax is 55 or less,
Since it is extremely low as compared with montanic acid wax having an acid value of 100 or more, it is understood that the reason is that the amount of soap produced is small.

Accordingly, a first object of the present invention is to make it possible to easily and smoothly release a concrete molded product from a mold, which is a first property required for a mold release agent for concrete. In providing a mold release agent that can ensure the smoothness of the molding surface of the concrete molding,
A second object is to provide a release agent having one or more, and preferably all, of the above-mentioned second properties.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a mold releasing agent for concrete molds, which has an acid value of 4 or less.
A release agent containing a montanic acid ester wax as a main component obtained by dispersing a montanic acid ester wax having a value of 0 or less in water via a nonionic surfactant, and having a dripping point on a mold surface of a concrete formwork. Is characterized by forming a film at 50 ° C to 100 ° C.

The montanic acid ester wax used in the present invention is obtained by decomposing and refining montan wax to montanic acid and then performing an esterification reaction with a higher alcohol, and is selected from those having little physical property variation. You. The drop point is a value measured based on a drop point test method specified in JIS K 2220, and in the present invention, is a value indicating the degree of softening of a film formed by a release agent with respect to temperature. is there.

The concrete mold release agent according to the present invention may have a form containing a montanic acid ester wax in an amount of 2 wt% to 30 wt%. In another embodiment, at least one wax selected from the group consisting of a vegetable wax, an animal wax, a mineral wax other than a montanic ester wax, and a petroleum wax is used as a main component (montanic ester wax). A form containing 50 wt% or less, a form containing 10 wt% or less of polyethylene oxide with respect to the main component, 0.5 wt% to 2.5 wt% of ammonia water with respect to the main component as ammonia, boric acid, metaboric acid, Molybdic acid, tungstic acid, at least one of the alkali metal salts of titanic acid is added to the release agent in an amount of 0.0
It can be in a form containing 5 wt% to 0.5 wt%.

The above-mentioned waxes other than the montanic acid ester wax include, for example, wood wax for vegetable wax, whale wax for animal wax, and mineral wax other than montanic acid ester wax. Is ozokerite, etc., and in petroleum wax, paraffin wax etc. and its modified wax,
Synthetic hydrocarbon waxes such as oxidized polyethylene waxes and oxidized polypropylene waxes, and other waxes include hydrogenated oil waxes.

[0011]

The mold release agent for concrete according to the present invention has a dropping point of 50 ° C. on the mold surface of the concrete form.
~ 100 ° C, which does not liquefy or fluidize under the effect of the drying temperature during concrete molding. It reliably intervenes between the molding surfaces of the molded product, and exerts the mold releasing action of the concrete molded product. In this case, the dried film is slightly softened by the effect of the drying temperature at the time of concrete molding and the shearing property is slightly reduced, so that the concrete molded product is easily and smoothly released from the mold.

Further, the mold release agent for concrete according to the present invention has a high affinity for metals. Therefore, when the concrete mold is a metal mold such as iron, the mold mold release agent is applied to the mold surface. A film having a uniform thickness is formed and is interposed between all contact portions between the mold surface and the molding surface of the concrete molded product, thereby exerting a mold releasing action of the concrete molded product. In this case, since the film has higher affinity for concrete than metal, the film is transferred to the molding surface of the concrete molded product when the concrete molded product is released. As a result, the molding surface of the concrete molded product has high smoothness due to the transferred film, and does not leave a part of the concrete or the film on the mold surface of the mold, thereby reducing the length of the mold. Enables continuous use for a period.

Further, since the film formed by the mold release agent for concrete according to the present invention has an extremely thin hue and is hardly deteriorated by air or sunlight, the molding surface of the concrete molding has a long hue. Maintained for a period.

[0014] The mold release agent for concrete according to the present invention contains an oxidized polyolefin wax such as an oxidized polyethylene wax and an oxidized polypropylene wax, paraffin wax and other waxes different from the montanic acid ester wax. Is effective for whitening the molding surface of the concrete molded product, and containing ammonia is effective for preventing the generation of air bubbles on the molding surface when the concrete is poured into the mold. Further, the addition of an alkali metal salt such as boric acid, metaboric acid, molybdic acid, tungstic acid, and titanic acid is effective for preventing rust of a metal mold.

Further, in the mold releasing agent for concrete according to the present invention, the polyethylene oxide is contained, and when the concrete molded product is released from the mold, the releasing agent remains in a film state when the concrete molding is released from the mold. It is effective to reliably prevent a small amount from remaining in the frame or gradually accumulating thereafter.

In the release agent according to the present invention, a release agent having optimal characteristics can be prepared by appropriately combining the above-mentioned components with a montanic acid ester wax as a main component. The use of a mold release agent having the optimum characteristics improves the mold releasability of a concrete molded product, and, of course, improves the reusability of a mold. The film transfers to the molding surface of the concrete molding and functions as a protective film on the molding surface, protecting the molding from sunlight, contaminated air, wind and rain, cold and warm, freezing, smoke damage, salt damage, other chemical damage, and The surface of the molded article can be made beautiful and rich in water resistance.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION A mold release agent for concrete according to the present invention is a montanic acid ester wax obtained by dispersing a montanic acid ester wax having an acid value of 40 or less in water via a nonionic surfactant. And a dropping agent having a drop point of 50 on the mold surface of the concrete formwork.
It forms a film at a temperature of 100C to 100C. In addition, the release agent contains the following various active ingredients as necessary. (Regarding the properties of the release agent) In order to release a concrete molded product from a concrete mold (hereinafter sometimes simply referred to as a mold), a releasing action is performed between the molding surface of the concrete molded product and the mold surface of the mold. It is necessary that a film having Further, the coating does not liquefy or fluidize at the drying temperature (50 ° C. to 70 ° C.) when the concrete molded product is dried, and the molding surface of the concrete molded product and the mold of the formwork are not completed until the concrete molding is completed. In addition to being reliably interposed between the surfaces, depending on the drying temperature,
It is necessary that the material soften slightly and the shearing property decreases slightly. Furthermore, it is necessary that the film does not remain on the mold when the concrete molded product is released, and that the film is selectively transferred to the molding surface of the concrete molded product.

By interposing a film having all these characteristics between the molding surface of the concrete molding and the mold surface of the mold, the concrete molding can be easily and smoothly released from the mold. is there. A release agent capable of forming a film having these characteristics is suitable as a release agent for a concrete formwork. (Regarding the main component of the release agent) As the main component of the release agent, it is basically necessary to have a property of forming a film on the mold surface of the concrete mold. As the components to be contained, high melting point wax, fatty acid soap, synthetic resin, inorganic salts for forming glass, etc. can be considered, but the film formed by these components should be softened within the drying temperature range of the concrete molded product. Therefore, the required low shearing property at the time of releasing the concrete molded product cannot be obtained. In addition, when the concrete molded product is released from the mold, the film does not reliably and sufficiently transfer from the mold surface of the mold to the molded surface of the concrete molded product.

The present inventors have conducted intensive studies on this point and found that montanic acid ester wax is suitable as a main component of a release agent capable of forming a film having the above-mentioned properties, and particularly, an acid value of 40 or less. Was found to be optimal. The montanic acid ester wax is preferably dispersed in water via a nonionic surfactant and used as a water-dispersed release agent. When the montanic acid ester wax is dispersed in water via a nonionic surfactant and applied to a mold surface of a concrete formwork, a film having the following characteristics is formed on the mold surface.

The film formed has a dropping point of 50 ° C. to 100 ° C.
℃, and in the drying temperature range of the concrete molding,
It is accurately interposed between the mold surface of the concrete mold and the molding surface of the concrete molded product, and slightly softens in the drying temperature range when the concrete molded product is released, and exhibits low shearing properties. And shows good transferability to the molding surface side of the concrete molding.

Since the formed film has a high affinity for the metal mold, it is well adsorbed on the mold surface of the mold to have a uniform thickness, and has a smooth surface and a low friction coefficient on the surface. There is no or almost no loss of film and no concrete molding surface when concrete is poured into a mold.

The hue of the formed film is extremely thin, and when the film is transferred to the molding surface of the concrete molding, the molding surface of the concrete molding is not discolored by the hue of the coating itself. Further, since the film has a low degree of unsaturation and is hardly deteriorated by air or sunlight, discoloration does not occur over time on the molding surface of the concrete molding. The transferred film has a uniform thickness, does not fluidize at room temperature, exhibits a wax-like function, protects the molding surface of the concrete molding, and improves the water resistance of the molding.

In the film to be formed, the acid value of the montanic acid ester wax, which is the main component, is low, so that it hardly acts with calcium ions in the concrete to form a high melting point calcium soap. In addition, the releasability of the concrete molded product is not hindered by increasing the melting point of the film, and a part of the film does not adhere to the mold surface of the concrete form and remains. (About acid value of montanic acid ester wax) The acid value of the montanic acid ester wax, which is a main component in the release agent, is most preferably 0, but such a montanic acid ester wax is prepared. It is difficult to do and generally does not exist. Accordingly, the acid value of the montanic acid ester wax is 40 or less, and is preferably as small as possible. For example, montanic acid 1 having an acid value of 130 is added to 9 parts of a montanic acid ester wax having an acid value of 26.
In the case of a montanic acid wax prepared by adjusting the acid value to 36.4 by blending parts, a release agent capable of forming a film having a high release property can be prepared. However, in a montanic acid ester wax prepared by mixing 2 parts of the same montanic acid with 8 parts of the same montanic acid ester wax and adjusting the acid value to 46.8, a releasing agent capable of forming a film having a high releasing property is used. It cannot be prepared. (Regarding the content of montanic acid ester wax) In the case of a releasing agent containing a montanic acid ester wax as a main component, the releasability of a film formed by the releasing agent largely depends on the concentration of the montanic acid ester wax as a main component. I do.
The content of montanic acid ester wax is 2 wt% to 3 wt%.
It is preferably 0 wt%, and the thickness of the film formed by the release agent is preferably 0.5 μm to 4.0 μm.

When the content of the montanic acid ester wax is 2
When the content is less than wt%, the formed film becomes a thin film having a thickness of 0.5 μm or less, and has a sufficient effect on the releasability of the concrete molded product and the smoothness of the molding surface of the molded product. Can not be obtained. On the other hand, the stability of the water-dispersed state of the montanic acid ester wax is limited to a content of 30 wt%, and if the content exceeds 30 wt%, the wax tends to gel without exhibiting a stable dispersed state.

Therefore, the content of the montanic acid ester wax is preferably 2 wt% to 30 wt%.
In consideration of the workability such as the work of applying the release agent to the mold and the economy, the range of 5 wt% to 15 wt% is more preferable. The release agent is applied to the mold surface of the mold frame by an appropriate means to form a film that adheres to the mold surface. The release agent is applied on the mold surface by, for example, a brush, a mop, a spray, or the like. (Regarding the surfactant) In order to prepare a release agent, it is necessary to disperse the montanic acid ester wax, which is a main component, evenly in water to form a water dispersion type in which a stable dispersion state is maintained for a long period of time. . For this reason, it is necessary to use a surfactant when preparing the release agent. As a surfactant to be used, it is necessary to consider that the stable dispersion state of the montanic acid ester wax is not impaired with time, and from this viewpoint, a nonionic surfactant is used. Are suitable. In this case, the larger the amount of the nonionic surfactant used, the better the dispersibility. However, there is a possibility that the releasability of the formed film may be affected. % To 30% by weight.

Preferred combinations of surfactants include:
Polyoxyethylene alkyl ether 1 having 16 or more carbon atoms and having a polyoxyethylene (EO) addition amount of 12 mol or more;
And 0.25 part of a polyoxyethylene alkyl ether having 12 or less carbon atoms and an (EO) addition amount of 12 mol or less.
A combination of 0.5 parts can be mentioned. Further, polyethylene glycol fatty acid esters such as polyethylene glycol monostearate and polyethylene glycol distearate alone, combinations thereof, and combinations of these with the above-mentioned polyoxyethylene alkyl ethers are also preferable. Use of these combinations is also preferred. Is extremely effective for stabilizing the dispersibility of the aqueous dispersion. (About waxes other than montanic acid ester wax) The montanic acid ester wax which is a main component of the release agent according to the present invention forms a film having an extremely thin hue, and the film is transferred to the molding surface of a concrete molding. Then, the hue of the film itself does not discolor the molding surface of the concrete molded product, and the film is less deteriorated by air and sunlight, and the discoloration of the molding surface of the concrete molded product over time does not occur. Absent.

By the way, in using the release agent according to the present invention, in order to positively whiten the molding surface of the concrete molded product, a wax other than the montanic acid ester wax is used.
For example, at least one wax selected from the group consisting of vegetable waxes, animal waxes, mineral waxes other than montanic acid ester waxes, and petroleum waxes is used. Specific waxes include wood wax as a vegetable wax, whale wax as an animal wax, ozokerite as a mineral wax other than montanic acid ester wax, paraffin wax as a petroleum wax, and modified waxes thereof. And synthetic hydrocarbon waxes such as polyethylene oxide wax and polypropylene oxide wax, and hydrogenated oil wax as other waxes.

These waxes are dispersed in water together with a montanic acid ester wax as a main component when preparing a release agent. The use amount of these waxes is preferably 50% by weight or less based on the main components. These waxes contained in the release agent form countless microscopic irregularities on the surface of the formed film without impairing the smoothness of the surface, and the irregularities cause irregular reflection of light. . For this reason, the film transferred to the molding surface of the concrete molded product, due to irregular reflection of light on the film surface,
The molding surface of the concrete molding is whitened.

With respect to these waxes, for example, in the case of oxidized polyolefin, which is a synthetic wax, the dropping point is as high as 110 ° C. or more. Lower. In addition, since paraffin wax, which is petroleum wax, has a strong water repellency, its excessive use hinders the formation of a uniform film and has the property of becoming brittle at low temperatures. The function as a protective film for the surface of the film is reduced. In vegetable waxes, animal waxes, and hydrogenated fats and oils, the carbon chains are short, and excessive use lowers the hardness of the formed film and has an iodine value, albeit minute, Excessive use can cause discoloration of the formed film. Therefore, in order to sufficiently exhibit the releasability of the montanic acid ester wax, the use of these waxes is preferably not more than 50 wt% with respect to the montanic acid ester wax. (About polyethylene oxide) The coating formed by applying a mold release agent to the mold surface of the mold is transferred to the molding surface of the concrete molded product when the concrete molded product is released from the mold surface of the mold. By releasing, it exhibits high releasability, functions as a protective film on the molding surface of the concrete molded product, and enables the mold to be reused repeatedly.
Therefore, it is optimal that the film formed on the mold surface of the formwork completely separates from the mold surface of the formwork and does not remain even slightly even from the viewpoint of functional and repeated reuse of the formwork. It is. In order to achieve this, it is preferable to use polyethylene oxide as an active ingredient of the release agent.

The polyethylene oxide in the film has a high affinity for water in the concrete poured into the mold and also functions as a binder for the cement component in the concrete. The transferability to is further improved. Therefore, the use of polyethylene oxide can reliably prevent the film from remaining and accumulating on the mold. In this case, the amount of polyethylene oxide to be used is preferably 10% by weight or less based on the montanic acid ester wax which is a main component of the release agent. In order to improve the transferability of the coating to the concrete molding side, a maximum of 1
0 wt% is sufficient, and if it is used more than that, there is a possibility that the releasability and the function of each component may be affected. (Regarding the ammonia content) The release agent comes into contact with concrete in the form of a formed film. At this time, the main component of the release agent reacts with calcium ions in the concrete to produce a high melting point metal soap. There is a risk. The produced high-melting metal soap adheres to and remains on the mold surface of the concrete mold, and is gradually accumulated by repeatedly using the mold. The accumulated metal soap increases the melting point of the film formed by mixing the release agent when applied to the mold, impairs the surface smoothness of the film, and lowers the release property of the film.

In the release agent according to the present invention, in consideration of this point, a montanic acid ester wax having extremely low reactivity with calcium ions is selected as a main component. However, even with montanic acid ester wax,
The reaction with calcium ions is not negligible, and trace amounts of metallic soap can be produced. Ammonia is effective as a component for preventing the production of a small amount of metal soap.

In a mold release agent containing montanic acid ester wax as a main component and containing an ammonia component, the reaction between the montanic acid ester wax and calcium ions in concrete is prevented, thereby preventing the formation of metal soap. Adhesion and accumulation of the mold on the mold surface are eliminated. For this reason, the formwork can be repeatedly reused for a long period of time, and the release of air bubbles from the concrete surface when the concrete is poured into the formwork is improved, and the releasability of the concrete molded product is improved. At the same time, the smoothness of the molding surface of the concrete molding is improved.

The amount of ammonia used is preferably 0.5 wt% to 2.5 wt% based on the main components.
Since calcium ions in concrete are as small as 0.2 wt%, the production of calcium soap can be prevented with a very small amount of ammonia. Excessive use of the ammonia component may cause odor in the preparation of the release agent, leading to deterioration of the working environment and possibly causing air pollution. Therefore, it is preferable to use as little as possible. (Regarding alkali metal salts) Metal molds, especially iron molds, are often used as concrete forms. The release agent according to the present invention is a water-dispersion type having a montanic acid ester wax as a main component, and particularly when an iron mold is repeatedly reused for a long time, it is preferable to consider rust prevention. . As the rust inhibitor, inorganic salts are preferable in consideration of the affinity for the mold and the solubility in water. Alkali metal salts such as sodium tungstate and sodium titanate are preferred, and these alkali metal salts may be one kind,
Further, two or more kinds may be used in combination.

When using these alkali metal salts, it is necessary to take care not to raise the dropping point of the film formed by the release agent, and the amount of the alkali metal salt to be used is 0.05 wt% to the entire release agent. 0.5 wt% is preferred. When the content of the alkali metal salt is less than 0.05 wt%, the rust prevention function is insufficient, and when the content exceeds 0.5 wt%, there is a possibility that an appropriate drop point of the film may be affected.

[0035]

Examples Nine types of release agents shown in Table 1 below (Examples 1 to 9) and nine types of release agents shown in Table 2 below (Comparative Examples 1 to 9) were used as release agents. Prepared, applying these release agents to the mold surface of the mold to form a film of a predetermined thickness on the mold surface, and using this mold to mold a concrete molded product, An experiment was conducted to confirm the releasability of concrete moldings. As the mold, an iron cylindrical mold having an inner diameter of 10 cm and a height of 20 cm was employed, and a film having a thickness of 3 μm was formed on the inner peripheral surface (mold surface) of the mold. As concrete, 1 part of ordinary Portland cement, 2 parts of sand
Part, concrete admixture (Sunflow VP-700)
A mixture prepared by mixing 0.0075 parts and 0.5 parts of water was used.

For the preparation of each release agent, a montanic acid ester wax (montanic acid octadecyl ester having an acid value of 26 at a dropping point of 80 ° C.) and a montanic acid wax (dropping point of 8
Acid value 130 at 4 ° C), Garnauba wax (drop point 86
Acid value 10 ° C), polyethylene oxide wax (drop point 1)
Acid value 22 at 30 ° C), paraffin wax (drop point 58
C) was dispersed in water and used as a wax dispersion. Each wax dispersion was prepared by dispersing 20 parts of each wax in a heated and molten state in 77 parts of hot water via 3 parts of a nonionic surfactant. (Release Agent of Example) Release Agent of Example 1: 20 of montanic acid ester wax
A 75% by weight dispersion is diluted with 25 parts of water.

Release agent of Example 2: A release agent consisting of 100 parts of a 25 wt% dispersion of montanic acid ester wax.

Release agent of Example 3: 45 parts of a 20 wt% dispersion of montanic acid wax and 5 parts of a 20 wt% dispersion of montanic acid wax diluted with 50 parts of water.

Release agent of Example 4: 50 parts of a 20 wt% dispersion of montanic acid ester wax and 10 parts of a 20 wt% dispersion of oxidized polyethylene wax diluted with 40 parts of water.

Release agent of Example 5: 15 parts by weight of a 15 wt% dispersion liquid of montanic acid ester wax and 0.1 part of sodium molybdate dihydrate diluted with 84.9 parts of water.

Release agent of Example 6: 25 parts of a 20% by weight dispersion liquid of montanic acid ester wax and 3.6 parts of 2.8% by weight of aqueous ammonia diluted with 71.4 parts of water.

Release agent of Example 7: 50 parts of a 20 wt% dispersion of montanic acid ester wax, 10 parts of a 20 wt% dispersion of carbana wax, 7.1 parts of 2.8 wt% aqueous ammonia and sodium tungstate Water salt 0.1 part diluted with water 32.8 parts.

Release agent of Example 8: 75 parts of a 20 wt% dispersion of montanic acid ester wax, 10 parts of a 20 wt% dispersion of oxidized polyethylene wax, 10.7 parts of 2.8 wt% aqueous ammonia, and sodium molybdate 0.1 part of dihydrate diluted with 4.3 parts of water.

Release agent of Example 9: 50 parts of 20 wt% dispersion of montanic acid ester wax, 10 parts of 20 wt% dispersion of carnauba wax, 20 w of paraffin wax
5% of t% dispersion liquid, 2.8 wt% ammonia water 7.1
Parts, 0.1 part of sodium tungstate dihydrate, and 8 w
3.1 parts of an aqueous solution of t.
Diluted in 7 parts. (Release Agent of Comparative Example) Release Agent of Comparative Example 1: 20 of montanic acid ester wax
7.5 parts by weight of a wt% dispersion liquid diluted with 92.5 parts of water.

Release agent of Comparative Example 2: A release agent consisting of only 100 parts of a 35 wt% dispersion liquid of montanic acid ester wax.

Release agent of Comparative Example 3: Carbana wax 2
25 parts of a 0 wt% dispersion liquid diluted with 75 parts of water.

Release agent of Comparative Example 4: 50 parts of a 20 wt% dispersion of paraffin wax diluted with 50 parts of water.

Release agent of Comparative Example 5: 40 parts of a 20 wt% dispersion of montanic acid ester wax and 10 parts of a 20 wt% dispersion of montanic acid wax diluted with 50 parts of water.

Mold release agent of Comparative Example 6: 50 parts of a 20 wt% dispersion of oxidized polyethylene wax and 0.1 part of sodium tungstate dihydrate diluted with 49.9 parts of water.

Mold release agent of Comparative Example 7: Carbana wax 2
A solution obtained by diluting 50 parts of a 0 wt% dispersion and 0.3 parts of sodium tungstate dihydrate with 79.7 parts of water.

Release agent of Comparative Example 8: 10 parts of a 20 wt% dispersion of montanic acid ester wax and 1 part of a 50 wt% aqueous solution of potassium hydroxide diluted with 89 parts of water.

Release agent of Comparative Example 9: 5 parts of a 20 wt% dispersion of montanic acid ester wax and 2 parts of a 50 wt% aqueous potassium hydroxide solution diluted with 93 parts of water.

[0053]

[Table 1]

[0054]

[Table 2]

However, the symbols a to j in the component column of each table
Represents the following components. That is, a: montanic acid ester wax, b: montanic acid wax, c: polyethylene oxide wax, d: carbana wax, e: paraffin wax, f: ammonia, g: sodium molybdate, h: sodium tungstate, i : Potassium hydroxide,
j: polyethylene oxide.

In this experiment, when molding a concrete molded product, a mold release agent was applied to the inner peripheral surface (mold surface) of the mold and dried to form a film having a thickness of 3 μm. However, the release agent was left for 3 days after preparation to confirm that the dispersion state was stable before use. The prepared concrete is poured into the mold, heated to 60 ° C. at a rate of 1 ° C./min, and maintained in this heated state for 5 hours to form a dried and solidified concrete molded product. The concrete molding was released from the mold.

In this experiment, the liquid properties of the release agent used, the dropping point and release properties of the film formed by the release agent, the smoothness and hue of the film transferred to the molding surface, and the release of the film Thereafter, the state of adhesion to the mold surface (residual film), the state of sticking to the mold surface (sticking property), and the state of rust on the mold surface (rust prevention) were confirmed and evaluated. Tables 3 and 4 show the obtained results. However, the liquid properties of the release agent, the dropping point and the releasability of the film formed by the release agent, the smoothness and hue of the film transferred to the molding surface, the stickiness, the film survivability and the rust prevention Means the following items and was evaluated based on these items.

Liquid property of release agent: The presence or absence of a liquid change when the release agent left for 50 days is compared with the release agent before standing, and excellent when there is no change in the liquid is excellent (◎). ) Are good (○), normal (△), slightly poor (×), poor (×
X) was evaluated on a five-point scale.

Dropping point of coating of release agent: JIS K 2220
The value measured based on the drop point test method specified in
This is a value indicating the degree of softening with respect to the temperature of the film.

Releasability of the film of the release agent: The ease with which the concrete molded product is released from the mold, that is, the strength of the force required for the concrete molded product to be released from the mold. Good (◎), good (○), normal (△), slightly poor (×),
The evaluation was made in five stages of poor (xx).

Smoothness of coating: The presence or absence of tentacle and visual differences when comparing the coating transferred to the molding surface of the concrete molded product with the coating formed with an oil-based release agent. Excellent when there is no change in visual observation (◎)
The evaluation was made on a five-point scale of good (○), normal (△), slightly poor (×), and poor (xx).

Hue of coating: The presence or absence of a hue difference when the molding surface of the concrete molding is compared with the molding surface of a concrete molding molded using a plastic mold without using a release agent. The case where there was no difference in the hue was evaluated as excellent (）), and evaluated on a five-point scale of good (普通), normal (△), slightly poor (×), and poor (xx). The evaluation of the hue was made between the concrete molded product immediately after demolding and 2
The test was performed on the concrete molded product that had been left for a month.

Noro adhesion to mold: This indicates the degree of noro adherence when the noro adheres to the mold surface of the mold visually, and is excellent when no noro adheres to the mold surface. As (◎), evaluation was made on a five-point scale of good (○), normal (△), slightly defective (×), and defective (xx).

Residue of the film on the mold: means the extent of the film remaining when there is no sticking of the film and the remaining of the film is confirmed by rubbing the mold surface from which the film has been released with a spatula.
The case where the film was not confirmed at all was evaluated as excellent (◎), and the case where the film was slightly observed was evaluated as good (○). Those with no evaluation of the film remaining property are those with sticking on the mold surface and cannot be checked for remaining film.

Rust prevention: The degree of occurrence of red rust on the mold surface when the mold is left for one day after use. The case where no red rust is confirmed is regarded as excellent (◎), and the occurrence of red rust is suspected. The case of the degree was evaluated as good (O), and the case where red rust was slightly observed was evaluated as poor (X).

[0066]

[Table 3]

[0067]

[Table 4]

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Taiichi Uehara 1-12-4 Marunouchi, Naka-ku, Nagoya City, Aichi Prefecture Inside Sugimura Chemical Industry Co., Ltd. (72) Inventor Naoki Yamaguchi 1-12 Marunouchi, Naka-ku, Nagoya City, Aichi Prefecture -4 Within Sugimura Chemical Industries Co., Ltd. (72) Inventor Yasuhiko Shiba 1-12-1, Marunouchi, Naka-ku, Nagoya City, Aichi Prefecture F-term (reference) 4G053 AA15 AA19 DA08 DA09 4H104 AA01C AA11C AA17C AA26C BB32A CB14C DA02A DA05A EA01Z EB04 FA04 FA06 PA48 QA02 QA08 RA01

Claims (5)

[Claims] 1. A mold release agent containing a montanic acid ester wax as a main component, wherein a montanic acid ester wax having an acid value of 40 or less is dispersed in water via a nonionic surfactant, and a concrete mold. 50 drops on the mold surface
A mold release agent for concrete, which forms a film at a temperature of from 100C to 100C. 2. The mold release agent for concrete according to claim 1, wherein the amount of the montanic acid ester wax is 2% by weight or less.
A mold release agent for concrete, characterized by containing 30% by weight. 3. The mold release agent for concrete according to claim 1, which is selected from the group consisting of vegetable waxes, animal waxes, mineral waxes other than montanic acid ester waxes, and petroleum waxes. A mold release agent for concrete, characterized by containing at least one kind of wax in an amount of 50% by weight or less based on a main component. 4. The concrete mold release agent according to claim 1, wherein the polyethylene mold contains 10% by weight or less of polyethylene oxide with respect to a main component. Release agent. 5. The mold release agent for concrete according to claim 1, 2, 3, or 4, wherein ammonia water is used as an ammonia component in an amount of 0.5 wt% to 2.5 wt% with respect to a main component.
%, Boric acid, metaboric acid, molybdic acid, tungstic acid,
A mold release agent for concrete, comprising at least one alkali metal titanate in an amount of 0.05 wt% to 0.5 wt% based on the whole release agent.