Surfactant composition for foaming sand

Abstract

The present invention provides a surfactant composition for foaming sand, which has excellent rapid foaming properties and increases the strength of the mold when manufacturing a mold such as a sand core using foaming sand. The surfactant composition contains a compound (A) of formula (1) and a compound (B) of formula (2). When the total mass of the compound (A) and the compound (B) is set to 100 mass%, the content of the compound (A) is 25 to 85 mass%, and the content of the compound (B) is 15 to 75 mass%. 1 O‑(EO) a ‑SO3M 1 ···(1)R 1 represents a hydrocarbon group having 6 to 22 carbon atoms, EO is an oxyethylene group, a is 1 to 10, M 1 is an alkali metal, alkaline earth metal, ammonium or organic ammonium. 2 CONR 3 C2H4SO3M 2 ···(2)R 2 CO represents an aliphatic acyl group having 6 to 22 carbon atoms, R 3 is a hydrogen atom or an alkyl group with 1 to 3 carbon atoms, M 2 It is an alkali metal, alkaline earth metal, ammonium or organic ammonium.

Description

Technical Field

[0001] The present invention relates to a surfactant composition for foaming sand, which is excellent in rapid foaming property of the foaming sand and improves the strength of the mold when producing a mold such as a sand core using the foaming sand. Background Art

[0002] Patent Document 1 is a known prior art related to mold-making devices. Patent Document 1 discloses a mold-making device that forms a mold by press-feeding a foamed mixture obtained by mixing granular aggregate, a water-soluble binder, and water into the cavity of a heated metal mold, and a mold device for use with the mold-making device. This device effectively utilizes the foamed mixture, ensures sufficient filling of the metal mold cavity with fluid sand, and significantly shortens the curing time of the foamed mixture.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: WO2005 / 089984A1 Summary of the Invention

[0006] Technical Problems to be Solved by the Invention

[0007] In the method described in Patent Document 1, a surfactant composition is added to the water-soluble binder to improve foaming and fluidity of the foamable mixture, requiring not only its inherent adhesive properties but also foamability. This surfactant is required to provide a surfactant composition for foamable sand that exhibits excellent rapid foaming properties and enhances mold strength.

[0008] The technical problem of the present invention is to provide a surfactant composition for foaming sand that has excellent rapid foaming properties and increases the strength of the mold when manufacturing a mold such as a sand core using the foamed sand.

[0009] Technical means to solve technical problems

[0010] The inventors of the present application conducted intensive research to solve the above-mentioned technical problems and found that a surfactant composition for foaming sand containing a specific polyoxyethylene alkyl ether sulfate, a specific acyl taurate, and a specific polyalkylene glycol derivative in specific proportions can achieve excellent rapid foaming properties of the foaming sand and increase the strength of the mold, thereby completing the present invention.

[0011] That is, the present invention is the following invention.

[0012] (1) A surfactant composition for foaming sand, comprising a compound (A) represented by the following formula (1) and a compound (B) represented by the following formula (2), wherein the surfactant composition for foaming sand is characterized in that, when the total mass of the compound (A) and the compound (B) is set to 100 mass%, the content of the compound (A) is 25 to 85 mass%, and the content of the compound (B) is 15 to 75 mass%.

[0013] R 1 O-(EO) a -SO3M 1 ···(1)

[0014] In formula (1), R 1 represents a hydrocarbon group having 6 to 22 carbon atoms, EO is an oxyethylene group, a is the average number of moles of the oxyethylene group added, a is 1 to 10, M 1 It is an alkali metal, alkaline earth metal, ammonium or organic ammonium.

[0015] R 2 CONR 3 C2H4SO3M 2 ···(2)

[0016] In formula (2), R 2 CO represents an aliphatic acyl group having 6 to 22 carbon atoms, R 3 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, M 2 It is an alkali metal, alkaline earth metal, ammonium or organic ammonium.

[0017] (2) The surfactant composition for foamed sand according to (1), further comprising a compound (C) represented by the following formula (3), wherein the content of the compound (C) is 1 to 20 parts by mass, based on 100 parts by mass of the total mass of the compound (A) and the compound (B).

[0018] R 4 O-(AO) b -H···(3)

[0019] In formula (3), R 4 represents a hydrogen atom or a hydrocarbon group having 1 to 5 carbon atoms, AO is an oxyalkylene group having 2 to 3 carbon atoms, b is the average number of added moles of the oxyalkylene groups, and b is 2 to 100.

[0020] Effects of the Invention

[0021] By using the surfactant composition for foamed sand of the present invention, sufficient foaming can be achieved simply by kneading the binder, sand, the surfactant composition, water, etc. for a short time, and a high-strength casting mold can be produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram showing a method for measuring kinematic viscosity.

[0023] Figure 2 This is a schematic diagram showing a state in which a test piece is set in a folding strength tester for a mold and the folding strength of the test piece is measured. DETAILED DESCRIPTION

[0024] The surfactant composition for foaming sand of the present invention comprises component (A), component (B), and, if necessary, component (C). The total mass of the compound (A) and the compound (B) is assumed to be 100% by mass. Each component is described below.

[0025] Furthermore, numerical ranges expressed as “1 to 10” and the like include upper and lower limits and mean 1 or more and 10 or less.

[0026] [(A) ingredient]

[0027] The component (A) used in the present invention is a polyoxyethylene alkyl ether sulfate salt represented by the following formula (1).

[0028] R 1 O-(EO) a -SO3M 1 ···(1)

[0029] In the polyoxyethylene alkyl ether sulfate salt represented by formula (1), R 1 It is a hydrocarbon group having 6 to 22 carbon atoms, preferably a hydrocarbon group having 6 to 20 carbon atoms. The hydrocarbon group may be a saturated hydrocarbon group, or may be a hydrocarbon group having a carbon-carbon double bond (particularly preferably an alkenyl group). When the hydrocarbon group is an unsaturated hydrocarbon group having a carbon-carbon double bond, the number of double bonds is preferably 3 or less, more preferably 2 or less. Examples of such hydrocarbon groups include octyl, decyl, lauryl, myristyl, palmityl, stearyl, oleyl, and behenyl. In addition, hydrocarbon groups derived from mixed fatty acids containing two or more hydrocarbon groups may also be used, for example, coconut oil hydrocarbon groups or palm kernel oil hydrocarbon groups may also be used. Among them, lauryl, myristyl, coconut oil hydrocarbon groups, and palm kernel oil hydrocarbon groups are preferred, and a mixture of lauryl and myristyl is further preferred.

[0030] In formula (1), a represents the average number of moles of added oxyethylene groups, and a is 1 to 10, preferably 2 to 6, and more preferably 3 to 4.

[0031] In formula (1), M 1is an alkali metal, an alkaline earth metal, ammonium or an organic ammonium. Examples of alkali metals include lithium, sodium, potassium, etc., preferably sodium. Examples of alkaline earth metals include calcium, strontium, barium, etc., preferably calcium. Ammonium is NH4 + .

[0032] Examples of the organic ammonium include alkanolammonium derived from alkanolamines such as monoethanolamine, diethanolamine, and triethanolamine, and alkylammonium derived from alkylamines such as diethylamine and triethylamine.

[0033] In the present invention, one or two or more components (A) can be appropriately selected and used.

[0034] In addition, when the total mass of compound (A) and compound (B) is set to 100 mass %, the content of (A) component is 25 to 85 mass %. When the content of (A) component is less than 25 mass %, rapid foaming may decrease, and therefore it is set to more than 25 mass %, more preferably more than 30 mass %, and more preferably more than 35 mass %. In addition, when the content of component (A) exceeds 85 mass %, the strength of the mold may decrease, and therefore it is set to less than 85 mass %, more preferably less than 75 mass %, and more preferably less than 70 mass %.

[0035] [(B) ingredient]

[0036] The component (B) used in the present invention is an acyl taurine salt represented by the following formula (2).

[0037] R 2 CONR 3 C2H4SO3M 2 ···(2)

[0038] In the acyl taurate represented by formula (2), R 2 CO is an aliphatic acyl group having 6 to 22 carbon atoms, preferably an aliphatic acyl group having 10 to 18 carbon atoms. Examples of such aliphatic acyl groups include octanoyl, decanoyl, lauroyl, myristoyl, palmitoyl, stearoyl, behenoyl, and mixtures thereof such as coconut oil fatty acid residues, palm oil fatty acid residues, palm kernel oil fatty acid residues, tallow fatty acid residues, and solidified tallow fatty acid residues.

[0039] In formula (2), R 3 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. Examples of the alkyl group having 1 to 3 carbon atoms include a methyl group, an ethyl group, a propyl group, and an isopropyl group. Preferably, it is a hydrogen atom, a methyl group, or an ethyl group.

[0040] These acyltaurates can be obtained, for example, by the following method: Sodium methyltaurate is acylated with fatty acid chloride in the presence of sodium hydroxide to obtain acylmethyltaurine sodium salt.

[0041] In formula (2), M 2 It is an alkali metal, an alkaline earth metal, ammonium, or an organic ammonium. Examples of the alkali metal include lithium, sodium, potassium, and the like, preferably sodium. Examples of the alkaline earth metal include magnesium, strontium, and barium, and preferably magnesium. Examples of the organic ammonium include alkanolammonium derived from alkanolamines such as monoethanolamine, diethanolamine, and triethanolamine, and alkylammonium derived from alkylamines such as diethylamine and triethylamine.

[0042] In the present invention, one or two or more components (B) can be appropriately selected and used.

[0043] In addition, when the total mass of compound (A) and compound (B) is set to 100 mass %, the content of (B) component is 15 to 75 mass %. When the content of (B) component is less than 15 mass %, rapid foaming property will decrease, so it is set to more than 15 mass %, more preferably more than 20 mass %. In addition, when the content of component (B) exceeds 75 mass %, the strength of the mold may decrease, so it is set to less than 75 mass %, preferably less than 65 mass %, more preferably less than 60 mass %.

[0044] [(C) ingredient]

[0045] The component (C) used in the present invention is a polyalkylene glycol derivative represented by the following formula (3).

[0046] R 4 O-(AO) b -H···(3)

[0047] In formula (3), R 4 is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms. Examples of the alkyl group having 1 to 5 carbon atoms include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, hexyl, and isohexyl. Preferred are hydrogen, methyl, and butyl groups.

[0048] In formula (3), AO is an oxyalkylene group having 2 to 3 carbon atoms. Examples of the oxyalkylene group having 2 to 3 carbon atoms include oxyethylene groups and oxypropylene groups. AO may be composed solely of oxyethylene groups, solely of oxypropylene groups, or may contain both oxyethylene groups and oxypropylene groups. When AO contains both groups, it is more preferred that oxyethylene groups account for 40 mol% or more of the ratio of oxyethylene groups to oxypropylene groups. The addition form may be block or random.

[0049] In formula (3), b represents the number of added moles of the alkylene oxide having 2 to 3 carbon atoms, and is 2 to 100, preferably 10 to 80, and more preferably 30 to 60.

[0050] In the present invention, one or two or more components (C) can be appropriately selected and used.

[0051] In addition, when the total mass of compound (A) and compound (B) is 100 parts by mass, the content of component (C) is preferably 1 to 20 parts by mass. When the content of component (C) is less than 1 part by mass, the strength of the mold decreases, so it is set to 1 part by mass or more, more preferably 3 parts by mass or more, and even more preferably 5 parts by mass or more. In addition, when the content of component (C) exceeds 20 parts by mass, the rapid foaming property may decrease, so it is set to 20 parts by mass or less, preferably 18 parts by mass or less, and even more preferably 15 parts by mass or less.

[0052] The weight average molecular weight of component (C) is preferably 100 to 5000, more preferably 500 to 4500, and even more preferably 1000 to 4000. A molecular weight of less than 100 may reduce mold strength. A molecular weight exceeding 5000 may reduce rapid foaming properties.

[0053] In addition to the above-mentioned components, the surfactant composition for foamed sand of the present invention may contain additives within a range that does not impair the effects of the present invention. Examples thereof include surfactants other than component (A), component (B), and component (C), organic or inorganic salts, pH adjusters, fungicides, thickeners, chelating agents, pigments, and fragrances.

[0054] Example

[0055] [Examples 1 to 11 and Comparative Examples 1 to 6]

[0056] Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

[0057] All the raw materials of Examples 1 to 11 and Comparative Examples 1 to 6 shown in Tables 4 and 5 were placed in a beaker and stirred at 50° C. for 1 hour using a magnetic stirrer to prepare a surfactant composition for foamed sand. “-” in the table means not used.

[0058] In addition, the description of the symbols in formula (1) of each component A1 and A2 shown in Table 4 and Table 5 is recorded in Table 1, the description of the symbols in formula (2) of each component B1 and B2 shown in Table 4 and Table 5 is recorded in Table 2, and the physical properties of each component C1 and C2 shown in Table 4 and Table 5 are recorded in Table 3.

[0059] The following tests were performed on each of the obtained surfactant compositions for foamed sand. In all the tests, those evaluated as "⊚" and "◯" were considered "acceptable".

[0060] (1) Rapid foaming

[0061] Step 1

[0062] Prepare artificial sand as granular aggregate, water glass as a water-soluble binder, a surfactant for evaluation, and water. These materials are placed in a kneading apparatus at a weight ratio of 100% artificial sand, 0.5-2.5% water glass solids, 0.01-0.05% surfactant active ingredient, and 2-4% water.

[0063] Step 2

[0064] The above materials were kneaded for 90 seconds using a kneading device, thereby preparing a foamed mixture.

[0065] Step 3

[0066] Add the foamed kneaded material into Figure 1 The kinematic viscometer shown.

[0067] Step 4

[0068] like Figure 1 As shown, a 1 kg weight is placed on the foamed kneaded material, and the time it takes for the weight to pass through the 50 mm interval reference line while the foamed kneaded material is discharged from a 6 mm hole below and the weight is lowered is measured to obtain the kinematic viscosity.

[0069] The rapid foaming property was evaluated according to the following evaluation criteria.

[0070] ◎: Measurement time less than 1.80 seconds

[0071] ○: Measurement time is 2.20 seconds or less and 1.80 seconds or more

[0072] ×: Measurement time exceeds 2.20 seconds

[0073] (2) Mold strength

[0074] The flexural strength of the mold using the foamed sand was measured.

[0075] Step 1

[0076] Prepare artificial sand as granular aggregate, water glass as a water-soluble binder, a surfactant for evaluation, and water. These materials are placed in a kneading apparatus at a weight ratio of 100% artificial sand, 0.5-2.5% water glass solids, 0.01-0.05% surfactant active ingredient, and 2-4% water.

[0077] Step 2

[0078] The above materials were kneaded for 120 seconds using a kneading device, thereby preparing a foamed mixture.

[0079] Step 3

[0080] The foamed mixture prepared above was placed into a molding die using a strength measurement test piece molding apparatus.

[0081] A casting test piece (10 mm×30 mm×85 mm) was molded by firing at 200 to 300° C. for 30 to 120 seconds using a molding die.

[0082] Step 4

[0083] The molded test piece was cooled to room temperature after being molded and removed.

[0084] Step 5

[0085] by Figure 2 The test piece is placed on a mold folding strength tester in the manner shown, and the folding strength of the test piece is measured and used as the mold strength. The unit of mold strength is kg / cm 2 .

[0086] The mold strength was evaluated according to the following evaluation criteria.

[0087] ◎: Mold strength is 25kg / cm 2 above

[0088] ○: Mold strength is 20kg / cm 2 Above and less than 25kg / cm 2

[0089] ×: Mold strength is less than 20kg / cm 2

[0090] [Table 1]

[0091]

[0092] A1: "PERSOFT EF" (manufactured by NOF Corporation)

[0093] A2: "TRAX K-40" (manufactured by NOF Corporation)

[0094] ※1: The values ​​in parentheses are the mass ratios of components containing each alkyl group.

[0095] [Table 2]

[0096] Aliphatic acyl group <![CDATA[R 2 Number of carbon atoms]]> <![CDATA[R 3 ]]> <![CDATA[M 2 ]]> B1 Octanoyl 9 methyl sodium B2 Coconut oil fatty acid residue※1 5～19 methyl sodium

[0097] B1: "DIAPON HF-SF" (manufactured by NOF Corporation)

[0098] B2: "DIAPON K" (manufactured by NOF Corporation)

[0099] ※1: For composition information, please refer to "Japanese Standard Food Composition Table 2015 Edition (7th Revision) Fatty Acid Composition Table, Chapter 2, Table 2, Fatty Acid Composition per 100g (Fatty Acid Composition Table), 14. Oils and Fats."

[0100] [Table 3]

[0101] <![CDATA[R 4 ]]> Molecular weight AO b C1 hydrogen atom 4000 EO 89 C2 Butyl 2000 EO / PO 44

[0102] C1: Water-soluble polyalkylene glycol derivative (weight average molecular weight: about 4000)

[0103] C2: Water-soluble polyalkylene glycol derivative (weight average molecular weight: about 2000)

[0104]

[0105] D1: "PERSOFT SK" (manufactured by NOF Corporation)

[0106] D2: "NISSAN ANON BDL-SF" (manufactured by NOF Corporation)

[0107] D3: "NAA-43" (manufactured by NOF Corporation)

[0108] D4: "NONSOUL LK-2" (manufactured by NOF Corporation)

[0109]

[0110] Since the surfactant compositions for foaming sand of Examples 1 to 11 of the present invention contain component (A), component (B), and component (C) in specific ratios, the foaming sand has excellent rapid foaming properties and good mold strength.

[0111] Since Comparative Example 1 does not contain the component (B) and the component (C), the rapid foaming property is low.

[0112] Since Comparative Example 2 does not contain the components (A) and (C), the mold strength is low.

[0113] In Comparative Example 3, since the content of the component (A) was low and the content of the component (B) was high, the mold strength was low.

[0114] In Comparative Example 4, since the content of the component (A) was high and the content of the component (B) was low, the rapid foaming property was low.

[0115] Since Comparative Example 5 does not contain the component (B), the rapid foaming property and the mold strength are low.

[0116] In Comparative Example 6, since the content of the component (A) was low and the content of the component (B) was high, the mold strength was low.

Claims

1. A surfactant composition for foaming sand, comprising a compound (A) represented by the following formula (1) and a compound (B) represented by the following formula (2), wherein, when the total mass of the compound (A) and the compound (B) is 100 mass%, the content of the compound (A) is 25 to 85 mass%, and the content of the compound (B) is 15 to 75 mass%, R 1 O-(EO) a -SO3M 1 ···(1) In formula (1), R 1 represents a hydrocarbon group having 6 to 22 carbon atoms, EO is an oxyethylene group, a is the average number of moles of the oxyethylene group added, a is 1 to 10, M 1 is an alkali metal, alkaline earth metal, ammonium or organic ammonium, R 2 CONR 3 C2H4SO3M 2 ···(2) In formula (2), R 2 CO represents an aliphatic acyl group having 6 to 22 carbon atoms, R 3 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, M 2 It is an alkali metal, alkaline earth metal, ammonium or organic ammonium.

2. The surfactant composition for foaming sand according to claim 1, wherein further contains a compound (C) represented by the following formula (3), wherein the content of the compound (C) is 1 to 20 parts by mass based on 100 parts by mass of the total mass of the compound (A) and the compound (B), R 4 O-(AO) b -H···(3) In formula (3), R 4 represents a hydrogen atom or a hydrocarbon group having 1 to 5 carbon atoms, AO is an oxyalkylene group having 2 to 3 carbon atoms, b is the average number of added moles of the oxyalkylene groups, and b is 2 to 100.

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