Additives for concrete stripping agents, concrete stripping agents, and methods for manufacturing concrete.

Abstract

An additive for concrete stripping agents (additive for concrete stripping agents) is provided to achieve concrete hardened surfaces with excellent peelability and aesthetic appearance. An additive for concrete stripping is characterized by containing component (A) represented by general formula (1).

Description

Technical Field

[0001] This invention relates to additives for concrete stripping agents, concrete stripping agents, and methods for manufacturing concrete. More specifically, it relates to additives for concrete stripping agents that improve peelability and surface aesthetics, concrete stripping agents comprising the additives for concrete stripping agents, and methods for manufacturing concrete. Background Technology

[0002] Traditionally, hardened concrete products, such as concrete products, suffer from the following problem: air bubbles form on the surface during their fabrication due to air bubbles generated between the product and the mold. From the perspective of durability and aesthetics, these air bubble marks are undesirable. Therefore, after demolding, the surface is typically trimmed or mortar is applied to the surface to achieve the desired finish.

[0003] However, such processing is labor-intensive and costly, so release agents that can suppress the formation of air bubbles on the surface of hardened concrete have been reported (for example, see Patent Documents 1-3).

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2018-130957

[0007] Patent Document 2: Japanese Patent Publication No. 9-507181

[0008] Patent Document 3: Japanese Patent Application Publication No. 6-278120 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] However, there is a demand for the development of a new type of release agent, replacing the release agents and the like described in Patent Documents 1 to 3, as well as a new type of additive mixed therein, which provides good release properties from the mold frame and results in a hardened concrete with few air bubbles and a beautiful surface.

[0011] Therefore, in view of the above-mentioned actual situation, the object of the present invention is to provide: an additive (i.e., an additive for concrete stripping agents) that, when mixed into a concrete stripping agent, effectively peels hardened concrete from the mold frame, thereby improving the surface appearance of the peeled hardened concrete; a concrete stripping agent containing the additive; and a method for manufacturing concrete.

[0012] Methods for solving problems

[0013] In order to solve the above-mentioned problems, the inventors conducted in-depth research and found that the problems can be solved by containing a specific component (A). According to the present invention, the following are provided: an additive for concrete stripping agents, a concrete stripping agent, and a method for manufacturing concrete.

[0014] [1] A concrete stripping agent, characterized in that it contains a component (A) represented by the following general formula (1).

[0015] [Chemical Formula 1]

[0016]

[0017] (In general formula (1), p is an integer of 0 or 1.) 1 It is a hydrocarbon group with 1 to 22 carbon atoms. R 2 It is an organic group represented by -XH (where X is a (poly)oxyalkylene group formed from 1 to 30 oxyalkylene groups with 2 to 4 carbon atoms, in which case p is 0), methyl, or hydrogen atom. R 3 It is an organic group represented by -YH (where Y is a (poly)oxyalkylene group formed by 1 to 30 alkylene groups with 2 to 4 carbon atoms (in this case, p is 0), R 3 This organic group is formed in R 2 (in the case of an organic group or hydrogen atom represented by -XH), or -CH2-COOM 1 The organic group represented (where M) 1 It is a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), or an organic amine, R 3 Become from the -CH2-COOM 1 The organic group represented is in R 2 (In the case of methyl or hydrogen atoms). R 2 and R 3 The total number of alkylene oxides represented by X and Y is 3–40.

[0018] [2] The concrete stripping agent according to [1] above also contains component (B) represented by the following general formula (2).

[0019] [Chemical Formula 2]

[0020]

[0021] (In general formula (2), R) 4 It is a hydrocarbon group with 6 to 22 carbon atoms, or an aromatic hydrocarbon group with 6 to 30 carbon atoms. R 5O is an alkylene oxide with 2 to 4 carbon atoms (wherein multiple alkylene oxides are present, there may be one or more of these alkylene oxides). M 2 It can be a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), or an organic amine. n is an integer from 0 to 20. m is an integer of 1 or 2.

[0022] [3] According to the concrete stripping agent additive described above [2], the component (B) contains a component (P1) with m=1 and a component (P2) with m=2 in the general formula (2).

[0023] When the sum of the P-nuclear NMR integral ratios attributable to components (P1) and (P2) in the P-nuclear NMR determination after alkali over-neutralization is set to 100%,

[0024] The NMR integral ratio of the p-nuclei attributable to the component (P1) is 30-90%.

[0025] [4] According to any one of [2] or [3] above, when the total content ratio of the component (A) and the component (B) is set to 100 parts by mass,

[0026] It contains the ingredient (A) in a proportion of 1 to 99 parts by mass, and contains the ingredient (B) in a proportion of 1 to 99 parts by mass.

[0027] [5] The concrete stripping agent additive described in [1] above also contains at least one compound selected from fatty acids having 8 to 30 carbon atoms and their salts, namely component (C).

[0028] [6] According to the concrete stripping agent additive described in [5] above, when the total content ratio of the component (A) and the component (C) is set to 100 parts by mass,

[0029] It contains the ingredient (A) in a proportion of 1 to 99 parts by mass, and contains the ingredient (C) in a proportion of 1 to 99 parts by mass.

[0030] [7] The concrete stripping agent additives described in [2] or [3] above also contain at least one compound selected from fatty acids having 8 to 30 carbon atoms and their salts, namely component (C).

[0031] [8] According to the concrete stripping agent additive described in [7] above, when the total content ratio of the components (A), (B) and (C) is set to 100 parts by mass,

[0032] The mixture contains the ingredient (A) in a proportion of 1 to 98 parts by mass, the ingredient (B) in a proportion of 1 to 98 parts by mass, and the ingredient (C) in a proportion of 1 to 98 parts by mass.

[0033] [9] A concrete stripping agent, characterized in that it contains any one of the concrete stripping agent additives and base oil described in any one of [1] to [8].

[0034]

[10] According to the concrete stripping agent described in [9] above, when the total proportion of the concrete stripping agent additive and the base oil is set to 100 parts by mass,

[0035] It contains the concrete stripping agent additive in a proportion of 0.5 to 20 parts by weight, and the base oil in a proportion of 80 to 99.5 parts by weight.

[0036]

[11] A concrete stripping agent, characterized in that it contains any one of the concrete stripping agent additives, base oil and nonionic surfactants (except for the substance corresponding to component (A)) mentioned above.

[0037]

[12] According to the concrete stripping agent described in

[11] above, when the total proportion of the concrete stripping agent additive, the base oil and the nonionic surfactant is set to 100 parts by mass,

[0038] It contains the concrete stripping agent additive in proportions of 0.5 to 20 parts by weight.

[0039] It contains the base oil in proportions of 60 to 98.5 parts by weight.

[0040] It contains the nonionic surfactant in a ratio of 1 to 20 parts by weight.

[0041]

[13] A method for manufacturing concrete, characterized in that it includes a coating process of applying the concrete stripping agent described in [9] or

[10] above to the inner surface of a formwork for concrete.

[0042] The filling process of filling the mold frame with a material used for forming concrete, which is a concrete material; and

[0043] The demolding process is the process of removing the hardened concrete, which is the material used to form the concrete, from the mold frame.

[0044]

[14] A method for manufacturing concrete, characterized in that it includes a coating process of applying an aqueous liquid of a concrete stripping agent obtained by mixing the concrete stripping agent described in

[11] or

[12] with water onto the inner surface of a formwork for concrete.

[0045] The filling process of filling the mold frame with a material used for forming concrete, which is a concrete material; and

[0046] The demolding process is the process of removing the hardened concrete, which is the material used to form the concrete, from the mold frame.

[0047] The effects of the invention

[0048] The additives for the concrete stripping agent of the present invention achieve the following effects: by mixing them into the concrete stripping agent, the concrete stripping agent effectively peels the hardened concrete from the mold frame, thereby reducing air bubbles and improving the surface appearance of the peeled hardened concrete.

[0049] The concrete stripping agent of the present invention has the following effects: it can effectively peel hardened concrete from the mold frame, thereby reducing air bubbles and improving the surface appearance of the peeled hardened concrete.

[0050] The concrete manufacturing method according to the present invention has the following effects: it can effectively peel the hardened concrete from the mold frame and can produce hardened concrete with fewer air bubbles and a beautiful surface. Detailed Implementation

[0051] The embodiments of the present invention will now be described. However, the present invention is not limited to the following embodiments. Therefore, it should be understood that appropriate modifications and improvements can be made to the following embodiments based on conventional knowledge of those skilled in the art without departing from the spirit of the present invention. It should be noted that in the following embodiments, unless otherwise stated, "%" refers to "mass %" and "parts" refers to "parts by mass".

[0052] (1) Additives for concrete stripping agents:

[0053] The concrete stripping agent additive of the present invention contains a specific component (A). By mixing such a concrete stripping agent additive into the concrete stripping agent, the concrete stripping agent effectively performs its stripping properties to peel hardened concrete from the mold frame, thereby resulting in a beautiful and aesthetically pleasing surface of the stripped hardened concrete.

[0054] (1-1) Ingredient (A):

[0055] The component (A) in the concrete stripping agent additive of the present invention is a compound represented by the following general formula (1).

[0056] [Chemical Formula 3]

[0057]

[0058] (In general formula (1), p is an integer of 0 or 1.) 1 It is a hydrocarbon group with 1 to 22 carbon atoms. R 2 It is an organic group represented by -XH (where X is a (poly)oxyalkylene group formed from 1 to 30 oxyalkylene groups with 2 to 4 carbon atoms, in which case p is 0), methyl, or hydrogen atom. R 3 It is an organic group represented by -YH (where Y is a (poly)oxyalkylene group formed by 1 to 30 alkylene groups with 2 to 4 carbon atoms (in this case, p is 0), R 3 This organic group is formed in R 2 (in the case of an organic group or hydrogen atom represented by -XH), or -CH2-COOM 1 The organic group represented (where M) 1 It is a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), or an organic amine, R 3 Become from the -CH2-COOM 1 The organic group represented is in R 2 (In the case of methyl or hydrogen atoms). R 2 and R 3 The total number of alkylene oxides represented by X and Y is 3–40.

[0059] R in general formula (1) 1 It consists of hydrocarbon groups with 1 to 22 carbon atoms, among which 6 to 22 carbon atoms are possible. In this way, concrete stripping agent additives with excellent peelability and surface aesthetics can be obtained.

[0060] R in general formula (1) 2 It is an organic group represented by -XH (where X is a (poly)oxyalkylene group formed from 1 to 30 alkylene groups with 2 to 4 carbon atoms, in which case p is 0), a methyl group, or a hydrogen atom. It should be noted that, regarding alkylene groups with 2 to 4 carbon atoms, when multiple alkylene groups are present, there can be one or more of these alkylene groups.

[0061] R in general formula (1) 3 It is an organic group represented by -YH (where Y is a (poly)oxyalkylene group formed by 1 to 30 alkylene groups with 2 to 4 carbon atoms (in this case, p is 0), R 3 This organic group is formed in R 2 (in the case of an organic group or hydrogen atom represented by -XH), or -CH2-COOM 1 The organic group represented (where M) 1It is a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), or an organic amine, R 3 Become from the -CH2-COOM 1 The organic group represented is in R 2 (in the case of methyl or hydrogen atoms).

[0062] R in general formula (1) 2 and R 3 The total number of alkylene oxides represented by X and Y in R is 3–40. That is, R 2 and R 3 The aforementioned pre-defined (poly)oxyalkylene groups can be used, but the total number of alkylene groups needs to be 3 to 40.

[0063] As a component (A), more specifically, compounds represented by the following general formula (1-1) are examples of component (a1), compounds represented by the following general formula (1-2) are examples of component (a2), etc.

[0064] (1-1a) Ingredient (a1):

[0065] Component (a1) is a compound represented by the following general formula (1-1).

[0066] [Chemical Formula 4]

[0067]

[0068] (wherein, in general formula (1-1), R) 1 It is a hydrocarbon group with 1 to 22 carbon atoms. R 6 O, R 7 O is an alkylene oxide with 2 to 4 carbon atoms (wherein, if multiple alkylene oxides are present, there may be one or more of these alkylene oxides). P is an integer of 0. q and r are each an integer from 0 to 30 (where q + r = 3 to 40).

[0069] In general formula (1-1) R 1 The group can be a hydrocarbon group with 8 to 20 carbon atoms. In this way, an additive for concrete stripping agents that exhibits excellent peelability and surface aesthetics can be obtained.

[0070] R in general formula (1-1) 6 O, R 7Each of the alkyl groups (O) is an alkylene oxide with 2 to 4 carbon atoms (wherein, if multiple alkylene oxides are present, they can be one or more of the same type). That is, when multiple alkylene oxides are present, they can all be of the same type, for example, only alkylene oxides with 2 carbon atoms, or they can be two or more types (for example, a combination of alkylene oxides with 2 carbon atoms and alkylene oxides with 4 carbon atoms). It should be noted that it is preferable that the alkylene oxides with 2 to 4 carbon atoms contain an alkylene oxide with 2 carbon atoms; specifically, it can be only an alkylene oxide with 2 carbon atoms, or a combination of an alkylene oxide with 2 carbon atoms and other alkylene oxides (specifically, an alkylene oxide with 3 carbon atoms). According to this method, a concrete stripping agent additive with excellent peelability and surface aesthetics can be obtained.

[0071] In general formula (1-1), q and r are each an independent integer from 0 to 30 (where q+r = 3 to 40), preferably compounds that satisfy q+r = 3 to 15 in general formula (1-1). In this way, concrete stripping agent additives with excellent peeling properties and surface aesthetics can be obtained.

[0072] Specifically, the components represented by the general formula (1-1) can be listed as: octylamine-polyoxyethylene adduct, decylamine-polyoxyethylene adduct, undecylamine-polyoxyethylene adduct, dodecylamine-polyoxyethylene adduct, tridecylamine-polyoxyethylene adduct, tetradecylamine-polyoxyethylene adduct, pentadecylamine-polyoxyethylene adduct, hexadecylamine-polyoxyethylene adduct, 2-hexyldecylamine-polyoxyethylene adduct, heptadecanylamine-polyoxyethylene adduct, octadecylamine-polyoxyethylene adduct, nonadecylamine-polyoxyethylene adduct, eicosamine-polyoxyethylene adduct, dodecylamine-polyoxyethylene adduct, and diacetylamine-polyoxyethylene adduct. 1. Decenylamine-polyoxyethylene adduct, 1 / 10-decenylamine-polyoxyethylene adduct, 1 / 2-decenylamine-polyoxyethylene adduct, 1 / 3-decenylamine-polyoxyethylene adduct, 1 / 4-decenylamine-polyoxyethylene adduct, 1 / 5-decenylamine-polyoxyethylene adduct, 1 / 6-decenylamine-polyoxyethylene adduct, 1 / 7-decenylamine-polyoxyethylene adduct, 1 / 8-decenylamine-polyoxyethylene adduct, 1 / 9-decenylamine-polyoxyethylene adduct, 1 / 2-decenylamine-polyoxyethylene adduct, 1 / 3-tallow amine-polyoxyethylene adduct, 1 / 4-hydrogenated tallow amine-polyoxyethylene adduct;Octylamine-(poly)oxyethylene / (poly)oxypropylene adduct, decylamine-(poly)oxyethylene / (poly)oxypropylene adduct, undecylamine-(poly)oxyethylene / (poly)oxypropylene adduct, dodecylamine-(poly)oxyethylene / (poly)oxypropylene adduct, tridecylamine-(poly)oxyethylene / (poly)oxypropylene adduct, tetradecylamine-(poly)oxyethylene / (poly)oxypropylene adduct, decadecylamine-(poly)oxyethylene / (poly)oxypropylene adduct, hexadecylamine-(poly)oxyethylene / (poly)oxypropylene adduct 2-Hexyldecylamine-(poly)oxyethylene / (poly)oxypropylene adduct, heptamine-(poly)oxyethylene / (poly)oxypropylene adduct, octadecamine-(poly)oxyethylene / (poly)oxypropylene adduct, nonadecamine-(poly)oxyethylene / (poly)oxypropylene adduct, eicosamine-(poly)oxyethylene / (poly)oxypropylene adduct, dodecylamine-(poly)oxyethylene / (poly)oxypropylene adduct, dodecylamine-(poly)oxyethylene / (poly)oxypropylene adduct, decenamine-(poly)oxyethylene / (poly)oxypropylene adduct Poly(oxypropylene) adduct, undecyleneamine-(poly)oxyethylene / (poly)oxypropylene adduct, dodecyleneamine-(poly)oxyethylene / (poly)oxypropylene adduct, tridecyleneamine-(poly)oxyethylene / (poly)oxypropylene adduct, tetradecyleneamine-(poly)oxyethylene / (poly)oxypropylene adduct, pentadecyleneamine-(poly)oxyethylene / (poly)oxypropylene adduct, hexadecyleneamine-(poly)oxyethylene / (poly)oxypropylene adduct, heptadecaneamine-(poly)oxyethylene / (poly)oxypropylene adduct Alkene adducts, octadecene-eneamine-(poly)oxyethylene / (poly)oxypropylene adducts, nonadecene-eneamine-(poly)oxyethylene / (poly)oxypropylene adducts, eicosene-eneamine-(poly)oxyethylene / (poly)oxypropylene adducts, dodecene-eneamine-(poly)oxyethylene / (poly)oxypropylene adducts, dodecylamine-(poly)oxyethylene / (poly)oxypropylene adducts, tallow amine-(poly)oxyethylene / (poly)oxypropylene adducts, hydrogenated tallow amine-(poly)oxyethylene / (poly)oxypropylene adducts, etc.

[0073] (1-1b) Component (a2):

[0074] Component (a2) is a compound represented by the following general formula (1-2).

[0075] [Chemical Formula 5]

[0076]

[0077] (wherein, in general formula (1-2), R) 1 It is a hydrocarbon group with 1 to 22 carbon atoms. R 8 It is a hydrogen atom or a methyl group. P is an integer, either 0 or 1. M 1 It could be a hydrogen atom, an alkali metal, an alkaline earth metal (half an atom), or an organic amine.

[0078] In general formula (1-2) R1 The group can be a hydrocarbon group with 7 to 19 carbon atoms. Based on this method, concrete stripping agent additives with excellent peelability and surface aesthetics can be obtained.

[0079] R in general formula (1-2) 8 It can be a hydrogen atom or a methyl group, in which case it can be a methyl group. In this way, an additive for concrete stripping agents that exhibits excellent peelability and surface aesthetics can be obtained.

[0080] In general formula (1-2), p is an integer of 0 or 1, but p is preferably 1. In this way, an additive for concrete stripping agents that exhibits excellent peelability and surface aesthetics can be obtained.

[0081] M in general formula (1-2) 1 It can be a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), or an organic amine, among which it can be a hydrogen atom or an alkali metal. In this way, an additive for concrete stripping agents that exhibits excellent peelability and surface aesthetics can be obtained.

[0082] As components (a2) represented by general formulas (1-2), examples include: N-lauroyl sarcosine, N-oleoyl sarcosine, N-cocoyl glycine, sarcosine, N-ethyl glycine, N-acetylglycine, and their salts.

[0083] (1-2) Component (B):

[0084] The concrete stripping agent additive of the present invention preferably further contains component (B) represented by the following general formula (2). By mixing the concrete stripping agent additive further containing such component (B) into the concrete stripping agent, the concrete stripping agent further enhances its stripping properties by peeling hardened concrete from the mold frame, resulting in a better aesthetic appearance of the hardened concrete surface after stripping.

[0085] [Chemical Formula 6]

[0086]

[0087] (In general formula (2), R) 4 It is a hydrocarbon group with 6 to 22 carbon atoms, or an aromatic hydrocarbon group with 6 to 30 carbon atoms. R 5 O is an alkylene oxide with 2 to 4 carbon atoms (wherein multiple alkylene oxides are present, there may be one or more of these alkylene oxides). M 2 It can be a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), or an organic amine. n is an integer from 0 to 20. m is an integer of 1 or 2.

[0088] R in general formula (2) 4It is a hydrocarbon group with 6 to 22 carbon atoms, or an aromatic hydrocarbon group with 6 to 30 carbon atoms, among which it can be a hydrocarbon with 8 to 18 carbon atoms. In this way, an additive for concrete stripping agents with excellent peeling properties and surface aesthetics can be obtained.

[0089] R in general formula (2) 4 For example, residues obtained by removing the hydroxyl group from aliphatic alcohols with 6 to 22 carbon atoms, such as hexanol, heptanol, octanol, 2-ethylhexanol, nonanol, decanol, 2-propylheptanol, undecanol, dodecanol, 2-butyloctanol, tridecanol, tetradecanol, hexadecanol, octadecanol, isostearyl alcohol, oleyl alcohol, eicosanool, and docosanool; residues obtained by removing the hydroxyl group from phenols with 6 to 30 carbon atoms, such as phenol, cumylphenol, octylphenol, nonylphenol, phenylphenol, monostyrene phenol, and stilbene phenol; and residues obtained from each mole of hexanol, heptanol, octanol, 2-ethylhexanol, nonanol, decanol, and 2-propylheptanol. The residues remaining after removing hydroxyl groups from substances obtained by adding aliphatic alcohols with 6 to 22 carbon atoms, such as undecanoyl alcohol, dodecanoyl alcohol, 2-butyl-octanol, tridecanoyl alcohol, tetradecanoyl alcohol, hexadecanoyl alcohol, octadecanoyl alcohol, isostearyl alcohol, oleyl alcohol, eicosanoyl alcohol, and docosanoyl alcohol, in a total ratio of 1 to 20 moles; the residues remaining after removing hydroxyl groups from substances obtained by adding phenols with 6 to 30 carbon atoms, such as phenol, cumylphenol, octylphenol, nonylphenol, phenylphenol, monostyrene phenol, and stilbene phenol, in a total ratio of 1 to 20 moles; and so on.

[0090] R in general formula (2) 5 O is an alkylene oxide having 2 to 4 carbon atoms (wherein multiple alkylene oxides are present, there may be one or more of these alkylene oxides), among which it may be an alkylene oxide having 2 carbon atoms. Furthermore, the alkylene oxide having 2 to 4 carbon atoms may contain 50 mol% or more of an alkylene oxide having 2 carbon atoms. In this way, an additive for concrete stripping agents that exhibits excellent peelability and surface aesthetics can be obtained.

[0091] M in general formula (2) 2 It can be a hydrogen atom, an alkali metal, an alkaline earth metal (1 / 2 atom), or an organic amine. Among them, it can be a hydrogen atom or an organic amine. In this way, an additive for concrete stripping agents with excellent peeling properties and surface aesthetics can be obtained.

[0092] In general formula (2), n is an integer from 0 to 20, preferably an integer from 0 to 10. According to this method, an additive for concrete stripping agents that exhibits excellent peelability and surface aesthetics can be obtained.

[0093] In general formula (2), m is an integer of 1 or 2. Based on this method, concrete stripping agent additives with excellent peelability and surface aesthetics can be obtained.

[0094] (P-core NMR integral ratio)

[0095] Component (B) may contain component (P1) with m=1 and component (P2) with m=2 in general formula (2). Furthermore, in this case, during the P-nuclear NMR determination before alkali neutralization, when the total P-nuclear NMR integral ratios attributable to component (P1) and component (P2) are set to 100%, the P-nuclear NMR integral ratio attributable to component (P1) is preferably 30–90%, more preferably 35–80%, and more preferably 40–75%. Based on this configuration, a concrete stripping agent additive with superior peelability and surface aesthetics can be obtained.

[0096] Here, in this specification, "base over-neutralization pretreatment" refers to the pretreatment of adding excess base to the acid remaining in component (B), which can be carried out using conventionally known methods. It should be noted that there are no particular limitations on specific examples of bases; for example, hydroxides of alkali metals or alkaline earth metals can be listed. Furthermore, the base used in synthesizing component (a1) can be the same as or different from the base used in synthesizing component (a1). Specific examples of hydroxides of alkali metals or alkaline earth metals include, for example, sodium hydroxide, potassium hydroxide, magnesium hydroxide, and calcium hydroxide.

[0097] exist 31 In P-NMR determination, by performing this "base over-neutralization pretreatment" with an appropriate amount of base, the peaks belonging to component (P1) and component (P2) can be clearly distinguished, thereby enabling the calculation of the P-nucleus integral ratio belonging to each compound.

[0098] It should be noted that the P-nuclear NMR integral ratio attributable to component (P1) can be calculated, for example, as follows. That is, under conditions of alkaline neutralization of component (B) to a pH of 12 or higher, using the... 31 The values ​​measured by P-NMR (Valian Corporation, trade name MERCURY plus NMR Spectrometor System, 300MHz) are calculated based on the following equations (a) and (b). It should be noted that a mixture of heavy water and tetrahydrofuran in a volume ratio of 8 / 2 can be used as the solvent.

[0099] It should be noted that in formula (a) and formula (b), "P conversion 1" represents the P nuclear magnetic resonance integral value of the alkali metal salt or the like of the component (P1) attributed to m = 1 among the components (B) represented by the general formula (2), and "P conversion 2" represents the P nuclear magnetic resonance integral value of the alkali metal salt or the like of the component (P2) attributed to m = 2 among the components (B) represented by the general formula (2).

[0100] [Mathematical formula 1]

[0101]

[0102] [Mathematical formula 2]

[0103]

[0104] When the auxiliary agent for a concrete release agent of the present invention contains component (A) and component (B) (in the case of not containing component (C)), there is no particular limitation on their mixing ratio, but the following is preferred. That is, when the total content ratio of component (A) and component (B) is 100 parts by mass, it is preferred to contain component (A) in a ratio of 1 to 99 parts by mass and to contain component (B) in a ratio of 1 to 99 parts by mass. By adopting such a mixing ratio, an auxiliary agent for a concrete release agent with both more excellent peelability and surface appearance can be obtained. A more preferred mixing ratio of component (A) is 5 to 95 parts by mass, and a particularly preferred ratio is 5 to 90 parts by mass. In addition, a more preferred mixing ratio of component (B) is 5 to 95 parts by mass, and a particularly preferred ratio is 10 to 95 parts by mass.

[0105] (1-3) Component (C):

[0106] The auxiliary agent for a concrete release agent of the present invention preferably further contains at least one compound selected from fatty acids having 8 to 30 carbon atoms and their salts, namely component (C). By further containing component (C), an auxiliary agent for a concrete release agent with both more excellent peelability and surface appearance can be obtained. More specifically, component (C) improves the peelability between the mold frame and the concrete hardened body (hydraulic composition) and suppresses the generation of air bubble marks formed on the surface of the concrete hardened body.

[0107] Component (C) is at least one selected from the group consisting of fatty acids having 8 to 30 carbon atoms and their salts. Among them, fatty acids having 8 to 24 carbon atoms and their salts are preferred, and fatty acids having 8 to 22 carbon atoms and their salts are more preferred. It should be noted that when the number of carbon atoms is less than 8, the effect of improving peelability and surface appearance may not be sufficient.

[0108] Examples of components (C) include, for example: caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, ricinoleic acid, arachidic acid, behenic acid, lignoceric acid, beeswax acid, isostearic acid, erucic acid, 12-hydroxystearic acid, and their salts. Additionally, examples of mixtures thereof include tall oil fatty acids, coconut oil fatty acids, tallow fatty acids, castor oil fatty acids, lanolin fatty acids, and their salts.

[0109] When the concrete stripping agent additive of the present invention contains component (A) and component (C) (but does not contain component (B)), there is no particular limitation on their mixing ratio, but the following is preferred. That is, when the total content ratio of component (A) and component (C) is set to 100 parts by mass, it is preferable to contain component (A) in a ratio of 1 to 99 parts by mass and component (C) in a ratio of 1 to 99 parts by mass. By adopting such a mixing ratio, a concrete stripping agent additive with better peelability and surface aesthetics can be obtained. A more preferred mixing ratio for component (A) is 4 to 93 parts by mass, and a particularly preferred ratio is 6 to 90 parts by mass. In addition, a more preferred mixing ratio for component (C) is 7 to 96 parts by mass, and a particularly preferred ratio is 10 to 94 parts by mass.

[0110] When the concrete stripping agent additive of the present invention contains components (A), (B), and (C), there is no particular limitation on their mixing ratio, but the following is preferred. That is, when the total content ratio of components (A), (B), and (C) is set to 100 parts by mass, it is preferable to contain component (A) in a ratio of 1 to 98 parts by mass, component (B) in a ratio of 1 to 98 parts by mass, and component (C) in a ratio of 1 to 98 parts by mass. By setting such a mixing ratio, a concrete stripping agent additive with superior stripping properties and surface aesthetics can be obtained. A more preferred mixing ratio for component (A) is 3 to 92 parts by mass, and a particularly preferred ratio is 10 to 89 parts by mass. Similarly, a more preferred mixing ratio for component (B) is 3 to 90 parts by mass, and a particularly preferred ratio is 8 to 87 parts by mass. Furthermore, a more preferred mixing ratio for component (C) is 2 to 94 parts by mass, and a particularly preferred ratio is 3 to 82 parts by mass.

[0111] (1-4) Other components:

[0112] In addition to components (A) to (C) mentioned above, the concrete stripping agent additive of the present invention may further contain other components.

[0113] Other components include, for example, component (D) represented by the following general formula (3). When component (D) is included, an additive for concrete stripping agents that has excellent peelability and surface aesthetics can be obtained.

[0114] [Chemistry 7]

[0115]

[0116] (wherein, in general formula (3), R) 9 It is a hydrocarbon group with 8 to 22 carbon atoms. R 10 R 11 Each can be independently methyl, ethyl, or hydroxyethyl.

[0117] R in general formula (3) 9 These are hydrocarbon groups with 8 to 22 carbon atoms, among which 8 to 18 carbon atoms are possible. In this way, concrete stripping agent additives with excellent peelability and surface aesthetics can be obtained.

[0118] R in general formula (3) 10 R 11 Each of these components can be independently methyl, ethyl, or hydroxyethyl, and among them, methyl can be used. In this way, concrete stripping agent additives with excellent peelability and surface aesthetics can be obtained.

[0119] Examples of components (D) represented by general formula (3) include: octyl dimethylamine oxide, nonyldecyl dimethylamine oxide, decyl dimethylamine oxide, undecyl dimethylamine oxide, dodecyl dimethylamine oxide, tridecyl dimethylamine oxide, tetradecyl dimethylamine oxide, pentadecyl dimethylamine oxide, hexadecyl dimethylamine oxide, heptadecanyl dimethylamine oxide, octadecyl dimethylamine oxide, nonadecanyl dimethylamine oxide, isoeicosyl dimethylamine oxide, eicosyl dimethylamine oxide, dodecyl dimethylamine oxide, oleyl dimethylamine oxide, cocoyl dimethylamine oxide, cocoyl diethylamine oxide, lauryl dihydroxyethylamine oxide, etc.

[0120] Other components may include, for example, raw materials from component A, component B, component C, or byproducts or impurities from the synthesis process.

[0121] The proportion of other components can be set, for example, to 0 to 10% of the total mass of the concrete stripping agent additive of the present invention.

[0122] (2) Concrete stripping agent:

[0123] Concrete stripping agents contain base oil as the main component and further contain additives such as concrete stripping agent auxiliaries. Such concrete stripping agents include water-based and oil-based types, which can be appropriately selected and used according to the concrete material and intended application.

[0124] The concrete stripping agent additive of the present invention can be mixed with either water-based or oil-based stripping agents to effectively improve peelability and surface aesthetics. In other words, the concrete stripping agent additive of the present invention can effectively utilize both water-based (water-based substance) and oil-based (oil-based substance) stripping agents.

[0125] The following describes the oil-based concrete stripper and the water-based concrete stripper of the present invention, respectively.

[0126] (2-1) Oil-based concrete stripping agent:

[0127] The oil-based concrete stripper contains base oil as the main agent and the concrete stripper additives of the present invention described above. It is used directly without mixing with water.

[0128] There are no particular restrictions on the base oil; any base oil used in existing, well-known concrete stripping agents can be appropriately selected and adopted. Examples include: mineral oils such as kerosene, light oil, spinning oil, transformer oil, and machine oil; synthetic oils such as polyalphaolefins and polyol esters; vegetable oils such as rapeseed, coconut, palm, soybean, and sesame oil; fats and oils; and fatty acid esters. Among these, at least one from the group consisting of mineral oils, synthetic oils, and vegetable oils is preferred.

[0129] When the total content of the concrete stripping agent additive and the base oil is set to 100 parts by weight, it is preferable that the oil-based concrete stripping agent contains 0.5 to 20 parts by weight of the concrete stripping agent additive and 80 to 99.5 parts by weight of the base oil. In this manner, the stripping properties of the hardened concrete are further improved, resulting in fewer air bubbles and a better-looking surface in the stripped hardened concrete.

[0130] A more preferred mixing ratio for the additive used as a concrete stripping agent is 1 to 19 parts by mass, and a particularly preferred ratio is 1 to 18 parts by mass. Furthermore, a more preferred mixing ratio for the base oil is 81 to 99 parts by mass, and a particularly preferred ratio is 82 to 99 parts by mass.

[0131] In addition to base oil and concrete stripping agent additives, oil-based concrete stripping agents may also contain other additives.

[0132] Other additives include byproducts contained in base oils.

[0133] The proportion of other additives can be set, for example, to 0 to 10% of the total mass of the oil-based concrete stripper.

[0134] (2-2) Water-based concrete stripping agent:

[0135] The water-based concrete stripper contains a base oil as the main agent, the concrete stripper additive of the present invention described above, and a nonionic surfactant (except for the substance corresponding to component (A) above). It is used by adding water on site or by diluting it with water before use.

[0136] There are no particular restrictions on the base oil used; the same base oil as that mixed in the aforementioned oily concrete stripper can be appropriately selected and used.

[0137] There are no particular limitations on the nonionic surfactant used; any nonionic surfactants known in existing concrete stripping agents can be appropriately selected and employed. Examples of nonionic surfactants include: alkyl alcohols, alkylene alcohols and their epoxide adducts, alkylphenols and their epoxide adducts, mono(or di, tri)styrylphenol-epoxide adducts, castor oil-epoxide adducts, hydrogenated castor oil-epoxide adducts, dehydrated sorbitan fatty acid esters and their epoxide adducts, (poly)glycerol fatty acid esters and their epoxide adducts, sucrose fatty acid esters and their epoxide adducts, etc. It should be noted that since component (A) sometimes corresponds to a nonionic surfactant, in this invention, components other than these are used as nonionic surfactants.

[0138] When the total proportions of the concrete stripping agent additive, base oil, and nonionic surfactant are set to 100 parts by weight, it is preferable that the water-based concrete stripping agent contains 0.5 to 20 parts by weight of the concrete stripping agent additive, 60 to 98.5 parts by weight of the base oil, and 1 to 20 parts by weight of the nonionic surfactant. In this way, the stripping properties of the hardened concrete can be further improved, resulting in smaller air bubbles and a more aesthetically pleasing surface in the stripped hardened concrete.

[0139] A more preferred mixing ratio for the additive used as a concrete stripping agent is 1 to 18 parts by mass, and a particularly preferred ratio is 1 to 16 parts by mass. Furthermore, a more preferred mixing ratio for the base oil is 65 to 95 parts by mass, and a particularly preferred ratio is 75 to 89 parts by mass. Additionally, a more preferred mixing ratio for the nonionic surfactant is 1 to 18 parts by mass, and a particularly preferred ratio is 1 to 15 parts by mass.

[0140] In addition to base oil, concrete stripper additives, nonionic surfactants, and water, water-based concrete strippers may contain other additives.

[0141] Other additives include, for example, byproducts contained in base oils and byproducts such as polyoxyethylene produced during the synthesis of nonionic surfactants.

[0142] The proportion of other additives can be set, for example, to 1 to 10% of the total mass of the water-based concrete stripper.

[0143] (3) Use of concrete stripping agent:

[0144] The concrete stripper of the present invention can be used as a stripping agent for demolding hardened concrete (concrete hardener) from a mold frame during the production of concrete. Furthermore, there are no particular limitations on the type, material, or composition of the hardened concrete. That is, the concrete stripper of the present invention can be used effectively as a stripping agent for removing hardened concrete made of conventionally known materials. Additionally, the mold frame can typically be a metal frame such as steel or a wooden frame, but there are no limitations on the material of the mold frame; the concrete stripper of the present invention can be applied to conventionally known mold frames.

[0145] (4) Concrete manufacturing methods:

[0146] The concrete manufacturing method of the present invention comprises the following steps: a coating step of applying the concrete stripping agent of the present invention, or an aqueous solution obtained by diluting it with water, to the inner surface of a concrete mold; a filling step of filling the mold with a concrete forming material, which is the concrete material; and a stripping step of peeling the hardened concrete, which is the concrete forming material, from the mold. According to this manufacturing method, by using the concrete stripping agent of the present invention, the hardened concrete can be effectively peeled from the mold, and further, hardened concrete with fewer air bubbles and a beautiful surface can be manufactured. It should be noted that the concrete forming material is uncured concrete (ready-mixed concrete).

[0147] (4-1) Coating process:

[0148] There are no particular restrictions on the formwork used for concrete; any existing, well-known concrete formwork can be used. For example, the formwork can be made of metal such as steel, wood, or synthetic resin.

[0149] There are no particular limitations on the method of applying concrete stripping agent or water-based liquid to the inner surface of the formwork frame. For example, it can be applied by brushing, spraying, or other spraying methods.

[0150] Preferably, the concrete stripping agent is evenly applied to the entire inner surface of the formwork. There are no particular limitations on the coating thickness of the concrete stripping agent; it can be set appropriately.

[0151] When using a water-based concrete stripper, after applying it to the inner surface of the formwork, the stripper can be allowed to dry before filling with ready-mixed concrete. There are no particular restrictions on the drying conditions; they can be set appropriately.

[0152] (4-2) Process of preparing aqueous solutions:

[0153] When using a water-based concrete stripper, the concrete manufacturing method of the present invention may further include a water-based liquid preparation step. The water-based liquid preparation step is the following step: prior to the above-mentioned coating step, a concrete stripper further containing a nonionic surfactant (excluding the substance corresponding to component (A)) is mixed with water to prepare an water-based liquid of the concrete stripper.

[0154] The above-mentioned nonionic surfactants can be appropriately used as nonionic surfactants.

[0155] There are no particular restrictions on the proportion of concrete stripping agent in the water-based concrete stripping agent; it can be set appropriately, for example, it can be set to about 1-99% by mass. Preferably, it is 10-99% by mass. When the proportion of concrete stripping agent is too small, the stripping performance may decrease.

[0156] It should be noted that when using an oil-based concrete stripper, the oil-based concrete stripper can be directly applied to the inner surface of the formwork.

[0157] (4-3) Filling process:

[0158] There are no particular restrictions on the method of filling ready-mixed concrete into the formwork; methods such as injecting the ready-mixed concrete into the formwork in a single operation can be used. Alternatively, after filling, a rod vibrator or a formwork vibrator can be used for compaction.

[0159] There are no particular restrictions on the concrete forming material (hydraulic composition) used as a concrete material, and existing known concrete materials (hydraulic compositions) may be appropriately used.

[0160] (4-4) Maintenance procedures:

[0161] Typically, a curing process can be employed where ready-mixed concrete is filled into a mold and then allowed to harden. In the concrete manufacturing method of this invention, there are no particular limitations on the curing method until the concrete hardens, and existing known methods can be appropriately employed. For example, the concrete-filled mold can be directly exposed to outdoor temperatures to harden, or the hardening time can be shortened by heating at approximately 30–120°C for the desired time using steam or an autoclave.

[0162] (4-5) Demolding process:

[0163] The concrete manufacturing method of the present invention further includes a demolding step of removing the hardened concrete, which serves as a material for concrete formation, from the mold frame.

[0164] There are no particular limitations on the method for demolding hardened concrete from the mold frame, and existing known methods can be appropriately employed. In this invention, by using the concrete stripping agent of the present invention described above or an aqueous liquid obtained by diluting it with water, the demolding of hardened concrete in this demolding process becomes easier (i.e., the peelability becomes good).

[0165] Example

[0166] The present invention will now be described in detail based on embodiments, but the present invention is not limited to these embodiments.

[0167] In the following synthesis examples 1 to 6, the synthesis methods of components (A-1) to (A-3), (A-7), and (A-8), which are equivalent to component (A), will be described.

[0168] (Synthesis Example 1) Synthesis of component (A-1):

[0169] 533.3 g of dodecylamine was added to an autoclave. The autoclave was then completely purged with nitrogen, and the temperature was maintained at 155°C while stirring. 237.6 g of ethylene oxide was then introduced to maintain the pressure at 0.6 MPa. The mixture was then aged at this temperature for 0.5 hours. Next, the temperature was maintained at 100°C, and another 237.6 g of ethylene oxide was introduced to maintain the pressure at 0.6 MPa. The mixture was then aged at this temperature for 1 hour to complete the reaction, yielding component (A-1), which corresponds to component (A).

[0170] (Synthesis Example 2) Synthesis of component (A-2):

[0171] Except for changing the raw materials and the addition ratio, component (A-2), which is equivalent to component (A), was synthesized in the same way as component (A-1).

[0172] (Synthesis Example 3) Synthesis of component (A-3):

[0173] 1478.5 g of octadecylamine was added to an autoclave. The autoclave was then completely purged with nitrogen, and the temperature was maintained at 150°C while stirring. 483.3 g of ethylene oxide was then introduced to maintain the pressure at 0.5 MPa. The autoclave was then aged at this temperature for 0.5 hours and cooled to 60°C. 10.0 g of potassium hydroxide powder was then added as a catalyst. The autoclave was then completely purged with nitrogen and dehydrated, and the temperature was maintained at 120°C while stirring. 483.3 g of ethylene oxide was then introduced to maintain the pressure at 0.5 MPa. The autoclave was then aged at this temperature for 1 hour, and the temperature was then raised to 150°C. 2548.9 g of 1,2-epoxypropane was introduced while maintaining the pressure at 0.5 MPa. The autoclave was then aged at this temperature for 1 hour to complete the reaction, yielding component (A-3) equivalent to component (A).

[0174] Synthesis of components (A-7) and (A-8) in (Synthetic Examples 4 and 5):

[0175] Except for changing the raw materials and the addition ratio, components (A-7) and (A-8), which are equivalent to component (A), were synthesized in the same way as component (A-3).

[0176] Next, in the following synthesis examples 6 to 11, the synthesis methods of components (B-1) to (B-6) that correspond to component (B) will be described.

[0177] (Synthesis Example 6) Synthesis of component (B-1):

[0178] 915.3 g of oleyl alcohol-ethylene oxide 4 molar adduct was added to a reaction vessel, and 96.6 g of phosphorus pentoxide was added at 55 °C while stirring. The mixture was aged at 80 °C for 3 hours and then cooled to below 50 °C to obtain component (B-1), which is equivalent to component (B).

[0179] Synthesis of components (B-2) to (B-4) in (Synthetic Examples 7-9):

[0180] Except for changing the raw materials and the addition ratio, components (B-2) to (B-4), which are equivalent to component (B), were synthesized in the same way as component (B-1).

[0181] Synthesis of component (B-5) in (Synthesis Example 10):

[0182] 450.0 g of stilbene-phenol-ethylene oxide 12 molar adduct was added to a reaction vessel, and 24.1 g of phosphorus pentoxide was added at 50 °C while stirring. The mixture was aged at 70 °C for 3 hours, and then neutralized by adding 2.0 g of 48% potassium hydroxide aqueous solution and 0.1 g of calcium hydroxide at 50 °C. The water was then removed by vacuum distillation at 90 °C, yielding component (B-5) equivalent to component (B).

[0183] Synthesis of component (B-6) in (Synthesis Example 11):

[0184] Except for changing the raw materials and the addition ratio, component (B-6), which is equivalent to component (B), was synthesized in the same way as component (B-5).

[0185] Next, the substances shown in Table 1 below are used as component (A), and the substances shown in Table 2 below are used as component (B).

[0186] [Table 1]

[0187]

[0188] In Table 1, “A-4” to “A-6” and “A-10” use commercially available products. In addition, “A-9” uses 0.41g of calcium hydroxide diluted and neutralized in water with 100g of commercially available creatine, and then the water was removed by vacuum distillation.

[0189] [Table 2]

[0190]

[0191] ※1: K / Ca / H = 1 / 0.075 / 9 (molar ratio)

[0192] ※2: K / H = 4 / 6 (molar ratio)

[0193] In Table 2, the column “P-nuclear integral ratio (%)” indicates that when the total P-nuclear NMR integral ratios attributable to components (P1) and (P2) in component (B) are set to 100%, the “P-nuclear NMR integral ratio attributable to component (P1)” and the “P-nuclear NMR integral ratio attributable to component (P2)” are respectively. Components (B-1) to (B-6) are mixtures of components with m=1 and m=2 in general formula (2).

[0194] For the P-nuclear NMR integral ratio of components (P1) and (P2) in component (B) represented by general formula (2), under the condition that excess KOH is added to the alkali metal salt of aliphatic alcohol phosphate to make the pH above 12, the solution supplied to... 31The measured values in P-NMR (MERCURY plus NMR Spectrometor System, 300 MHz, manufactured by Varian) were calculated based on the following formulas (a) and (b). It should be noted that a mixed solvent of deuterium oxide / tetrahydrofuran = 8 / 2 (volume ratio) was used as the solvent.

[0195] [Mathematical formula 3]

[0196]

[0197] [Mathematical formula 4]

[0198]

[0199] Here, in formulas (a) and (b), "P-ization 1" represents the P nuclear NMR integral value of the alkali metal salt, etc. of the component (P1) attributed to m = 1 among the components (B) represented by the general formula (1), and "P-ization 2" represents the P nuclear NMR integral value of the alkali metal salt, etc. of the component (P2) attributed to m = 2 among the components (B) represented by the general formula (1).

[0200] Next, the substance shown in Table 3 below was used as component (C), and the substance shown in Table 4 below was used as component (D).

[0201] [Table 3]

[0202] In Table 3, "C-1" is oleic acid (manufactured by VANTAGE, VOLEIC OA10), and "C-2" is tall oil fatty acid (manufactured by Hrrima Chemicals Group, Inc., HARTALL FA-1P). In addition, for the components not specifically described in Tables 3 and 4, commercially available products were used in the same manner as the above "C-1", "C-2", etc.

[0203] [Table 4]

[0204] Next, as shown in Table 5, an auxiliary agent for concrete peeling agent was prepared using each component. It should be noted that for the substances containing water, water was removed by vacuum distillation before mixing.

[0205] [Table 5]

[0206]

[0207] In Table 5, "R-2" is a 10-mole adduct of lauryl alcohol with EO (manufactured by Takemoto Yushi Co., Ltd.), and "R-3" is a 6-mole adduct of oleyl alcohol with EO and 40-mole adduct with PO (manufactured by Takemoto Yushi Co., Ltd.).

[0208] (Examples 1-52, Comparative Examples 1-14)

[0209] Next, as shown in Tables 6 and 7, the components were mixed to prepare a concrete stripping agent. It should be noted that Examples 1-39 and Comparative Examples 1-9 in Table 6 show oil-based concrete stripping agents, while Examples 40-52 and Comparative Examples 10-14 in Table 7 show water-based concrete stripping agents. Furthermore, in Table 7, the mass parts of "water" represent the mass parts relative to a total of 100 parts by mass of base oil, concrete stripping agent additives, and nonionic surfactants.

[0210] [Table 6]

[0211]

[0212]

[0213] [Table 8]

[0214]

[0215] The "Base Oils" listed in Tables 6 and 7 are shown in Table 9 below. Additionally, the "Nonionic Surfactants" listed in Table 7 are shown in Table 10 below. It should be noted that in Table 9, Pure Safety 32 and Pure Spin D are manufactured by Cosmo Oil Co., Ltd., and Diana Fresia U-46 is manufactured by JXTG Energy Co., Ltd. Furthermore, they are all spinning oils.

[0216] [Table 9]

[0217]

[0218] [Table 10]

[0219]

[0220] (Evaluation Test)

[0221] The evaluation methods for the following aspects of the prepared concrete stripping agent (formulation stability, emulsion stability, stripping properties, and surface aesthetics) are as follows.

[0222] It should be noted that, in order to evaluate "peelability" and "surface aesthetics", a hydraulic composition (concrete material) was prepared in the following manner.

[0223] (Preparation of hydraulic compositions (concrete materials))

[0224] Concrete was prepared by adding all the components and admixtures shown in Table 11 to a 50L disc-type forced mixer at a constant temperature of 20°C and humidity of 80% under the mixing conditions described in Table 11, and kneading for 90 seconds. The prepared concrete was then filled into steel molds within 15 minutes after kneading. It should be noted that the concrete temperature was 21°C, the air content was 5.0%, and the slump was 18.0 cm.

[0225] As admixtures, high-performance water-reducing agent (Chupol NV-80 (JIS A 6204), 0.7% by mass relative to cement) and AE agent (AE-300 (JIS A 6204), 0.0025% by mass relative to cement) were used as part of the kneading water.

[0226] It should be noted that the specific contents of the materials used are as follows.

[0227] Cement: Ordinary Portland cement (an equal mixture of Pacific Cement Corporation, Ube Mitsubishi Cement Corporation, and Sumitomo Osaka Cement Corporation) with a density of 3.16 g / cm³. 3

[0228] Water: Gamagori City tap water

[0229] Fine aggregate: Oigawa water system terrestrial sand density 2.58g / cm 3

[0230] Coarse aggregate: Crushed stone from Okazaki, density 2.68 g / cm³ 3

[0231] [Table 11]

[0232]

[0233] (Formulation stability)

[0234] The test solution for concrete stripping agent, obtained by mixing base oil and concrete stripping agent additives, is added to a 250 mL transparent plastic container with a lid, and then left to stand at 20°C.

[0235] Then, the state of the test solution during settling was visually confirmed and evaluated appropriately (specifically, at weeks 1, 2, and 4 after the start of settling). The evaluation criteria are shown below. The evaluation results are shown in Tables 6 and 8.

[0236] S: After the initial standing period, a confirmation was performed in the 4th week to confirm that the test solution was homogeneous.

[0237] A: After the initial standing period, the test solution was homogeneous during the second week of confirmation, but became heterogeneous during the fourth week.

[0238] B: After the initial settling period, the test solution was homogeneous during the first week of confirmation, but became heterogeneous during the second week.

[0239] C: Unevenness of the test solution during the first week after the initial settling period.

[0240] (Emulsion stability)

[0241] Add 50g of the prepared test solution as a concrete stripping agent to a 250mL transparent plastic container with a lid, then add 200g of tap water from Pujun City, stir thoroughly, and let stand at 20°C.

[0242] Then, the state of the test solution during settling was visually confirmed and evaluated at appropriate times (specifically, at 1 hour, 6 hours, and 12 hours after the start of settling). The evaluation criteria are shown below. The evaluation results are shown in Table 8.

[0243] S: After the initial standing period, a check was performed at the 12-hour mark to confirm that the test solution was uniformly emulsified and free of turbidity.

[0244] A: After the initial standing period, the test solution was confirmed to be uniformly emulsified and cloudy at the 6-hour checkpoint. However, at the 12-hour checkpoint, the uniform emulsification and cloudiness of the test solution were not observed.

[0245] B: After the initial standing period, the test solution was confirmed to be uniformly emulsified and cloudy at the first hour. However, at the sixth hour, the uniform emulsification and cloudiness of the test solution were not observed.

[0246] C: After the initial standing period, during the first hour of confirmation, no uniform emulsification or turbidity of the test solution was observed.

[0247] (Peelable)

[0248] Apply the prepared concrete stripping agent evenly to the entire inner surface of a bottomed cylindrical steel formwork frame with an inner diameter of 10cm and a height of 20cm using a brush. Then, let it stand for at least 1 hour with the bottom side facing up, ensuring that no excess concrete stripping agent accumulates inside the formwork frame.

[0249] It should be noted that oil-based concrete stripper is applied directly without dilution, while water-based concrete stripper is diluted under the dilution conditions used in the above evaluation of "emulsification stability" before being applied.

[0250] As described above, concrete material (hydraulic composition) was poured into a steel mold frame coated with a concrete release agent on its inner surface using a large cup with a handle in a single operation. Then, the mold frame was vibrated (frequency 2800 vpm) for 30 seconds using a bench vibrator and left to stand in a constant temperature chamber at 20°C and 80% humidity. After 24 hours, the hardened concrete was demolded from the mold frame. The inner surface of the mold frame was then inspected, and the adhesion of the concrete material to the mold frame was visually verified to evaluate the release properties. The evaluation criteria are shown below. The evaluation results are shown in Tables 6 and 8.

[0251] S: There is almost no residual concrete material on the formwork.

[0252] A: There is a little concrete material attached to the formwork.

[0253] C: A considerable amount of concrete material is attached to the formwork.

[0254] (Aesthetically pleasing)

[0255] After evaluating the peelability, the side surface (cylindrical curved surface) of the obtained cylindrical hardened concrete was scanned using a handheld scanner (SANWA SUPPLY INC. "400-SCN032", 900 dpi resolution). The scanned image was binarized using the bitmap image editing / processing software "GIMP 2.10.20". The threshold for binarization was set such that the number of bubble marks in the original scanned image was equal to the number of bubble marks in the processed image. At this time, the boundary line of the mold frame with residual hardened concrete was sometimes identified as black, but it became white after deleting this part. Then, the parts other than the bubble marks identified as black and the bubble marks identified as white were distinguished. Then, the bubble occupancy rate (i.e., the proportion (%) of the part corresponding to the bubble mark relative to the entire side surface of the hardened concrete in the scanned image) was calculated. Then, the proportion of air bubbles in each hardened concrete sample relative to the proportion of air bubbles in the baseline test sample (formula: air bubble proportion of each hardened concrete sample / air bubble proportion of the baseline sample × 100 (%)) was calculated to evaluate the surface aesthetics. The evaluation criteria are shown below. The evaluation results are shown in Tables 6 and 8.

[0256] SS: Cases where the proportion of air bubbles in each hardened concrete product relative to the proportion of air bubbles in the reference product is less than 20%.

[0257] S: Cases where the proportion of air bubbles in each hardened concrete product relative to the proportion of air bubbles in the reference product is 20% or more but less than 30%.

[0258] A: When the proportion of air bubbles in each hardened concrete product relative to the proportion of air bubbles in the reference product is 30% or more but less than 50%.

[0259] B: Cases where the air bubble content of each hardened concrete product is more than 50% but less than 70% relative to the air bubble content of the reference product.

[0260] C: Cases where the proportion of air bubbles in each hardened concrete product relative to the proportion of air bubbles in the reference product is 70% or more.

[0261] (result)

[0262] As shown in Tables 6 and 8, it was confirmed that by mixing the concrete stripping agent of the present invention with the additive, the concrete stripping agent exhibits excellent peelability between the hardened concrete within the mold frame and the mold frame, resulting in a concrete hardened surface with excellent aesthetics. Similarly, it was confirmed that the concrete stripping agent of the present invention exhibits excellent peelability between the hardened concrete within the mold frame and the mold frame, resulting in a concrete hardened surface with excellent aesthetics.

[0263] Industrial applicability

[0264] The concrete stripping agent additive of the present invention can be used as an additive mixed in a concrete stripping agent, and plays a role in separating the formwork from the concrete during the manufacture of concrete, etc. Furthermore, the concrete stripping agent of the present invention can be used as a stripping agent that plays a role in separating the formwork from the concrete during the manufacture of concrete, etc.

Claims

1. An additive for concrete stripping agents, characterized in that, It contains component A represented by the following general formula (1), In general formula (1), p is an integer that is either 0 or 1; R 1 It is a hydrocarbon group with 1 to 22 carbon atoms; R 2 It is an organic group, methyl group, or hydrogen atom represented by -XH, wherein X is a polyoxyalkylene group formed by 1 to 30 oxyalkylene groups having 2 to 4 carbon atoms, and in this case, p is 0; R 3 It is an organic group represented by -YH, or by -CH2-COOM. 1 The organic group represented is Y, where Y is a polyoxyalkylene group formed from 1 to 30 oxyalkylene groups having 2 to 4 carbon atoms, and in this case, p is 0; in R 2 In the case of an organic group or hydrogen atom represented by -XH, R 3 The organic group represented by -YH; M 1 It is a hydrogen atom, an alkali metal, or an alkaline earth metal; in R 2 In the case of methyl or hydrogen atoms, R 3 For the -CH2-COOM 1 The organic group represented; R 2 and R 3 The total number of alkylene oxides represented by X and Y in the text is 3–40. It also contains component B, represented by the following general formula (2). In general formula (2), R 4 It is a hydrocarbon group with 6 to 22 carbon atoms, or an aromatic hydrocarbon group with 6 to 30 carbon atoms; R 5 O is an alkylene oxide with 2 to 4 carbon atoms, wherein, in the presence of multiple alkylene oxides, there may be one or more of these alkylene oxides; M 2 It is a hydrogen atom, an alkali metal, or an alkaline earth metal; n is an integer from 0 to 20; m is an integer of 1 or 2. The component B contains component P1 with m=1 and component P2 with m=2 in the general formula (2). When the total P-nuclear NMR integral ratio attributable to component P1 and component P2 in the P-nuclear NMR determination during the alkali over-neutralization pretreatment is set to 100%, The NMR integral ratio of the P-nuclei belonging to component P1 is 30%–90%. When the total proportion of component A and component B is set to 100 parts by mass, It contains component A in a proportion of 5 to 95 parts by mass, and contains component B in a proportion of 5 to 95 parts by mass.

2. The concrete stripping agent additive according to claim 1 further contains at least one compound selected from fatty acids having 8 to 30 carbon atoms and their salts, namely component C.

3. The additive for concrete stripping agent according to claim 2, wherein, When the total proportion of component A, component B, and component C is set to 100 parts by mass, It contains component A in a proportion of 1 to 98 parts by mass, component B in a proportion of 1 to 98 parts by mass, and component C in a proportion of 1 to 98 parts by mass.

4. A concrete stripping agent, characterized in that, Contains the concrete stripping agent additive and base oil as described in any one of claims 1 to 3. When the total proportion of the concrete stripping agent additive and the base oil is set to 100 parts by weight... It contains the concrete stripping agent additive in a proportion of 1 to 19 parts by weight, and the base oil in a proportion of 81 to 99 parts by weight.

5. A concrete stripping agent, characterized in that, The concrete stripping agent comprises any one of the additives, base oil, and nonionic surfactants according to claims 1 to 3, wherein the nonionic surfactant does not include component A. When the total proportions of the concrete stripping agent additive, the base oil, and the nonionic surfactant are set to 100 parts by weight... It contains the concrete stripping agent additive in proportions of 0.5 to 20 parts by weight. It contains the base oil in proportions of 60 to 98.5 parts by weight. It contains the nonionic surfactant in a ratio of 1 to 20 parts by weight.

6. A method for manufacturing concrete, characterized in that, include: The coating process of applying the concrete stripping agent as described in claim 4 to the inner surface of a concrete formwork. The filling process of filling the mold frame with a material used for forming concrete, which is a concrete material; and The demolding process is the process of removing the hardened concrete, which is the material used to form the concrete, from the mold frame.

7. A method for manufacturing concrete, characterized in that, include: The coating process of applying the aqueous liquid of the concrete stripping agent obtained by mixing the concrete stripping agent of claim 5 with water to the inner surface of the concrete formwork. The filling process of filling the mold frame with concrete forming material, which is a concrete material; as well as The demolding process is the process of removing the hardened concrete, which is the material used to form the concrete, from the mold frame.

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