Sand mold-forming additive, sand mold-forming composition, method for producing sand mold, and sand mold

Abstract

The sand mold-forming additive may contain a surfactant (A) including at least one selected from compounds represented by a formula (1) and compounds represented by a formula (8).

1 . A sand mold-forming additive, comprising:
 a surfactant (A) including at least one selected from compounds represented by a formula (1) below and compounds represented by a formula (8) below:   
       
         
           
           
               
               
           
         
       
       (In the formula (1), R 1  is a hydrocarbon group with 6 to 22 carbon atoms, R 2  is a hydrogen atom, a hydrocarbon group with 1 to 4 carbon atom(s) or a hydroxyalkyl group with 1 to 4 carbon atom(s), and R 3  is a group represented by one of formulas (2) to (7) below.) 
       
         
           
           
               
               
           
         
       
       (In the formulas (2) and (3), M 1  is an alkali metal atom; in the formulas (4) to (7), M 1  is an alkali metal atom or an organic amine; and in the formula (3), each of R 4  and R 5  is a hydrogen atom or a hydrocarbon group with 1 to 4 carbon atom(s).) 
       
         
           
           
               
               
           
         
       
       (In the formula (8), R 6  is a hydrocarbon group with 6 to 22 carbon atoms, R 7  is an alkylene group with 2 to 4 carbon atoms, n is an integer from 2 to 5, and M 2  is an alkali metal atom.) 
     
     
         2 . The sand mold-forming additive of  claim 1 , wherein each of R 1  in the formula (1) and R 6  in the formula (8) is a hydrocarbon group with 8 to 14 carbon atoms. 
     
     
         3 . The sand mold-forming additive of  claim 1 , further comprising a surfactant (B),
 wherein the   surfactant (B) comprise one selected from an alkyl sulfonate metal salt (B1), an alkyl sulfate metal salt (B2), a polyoxyalkylene alkyl ether sulfate metal salt (B3), an alkyl glycoside (B4), a polyoxyalkylene alkyl ether phosphate metal salt (B5), an alkyl benzene sulfonate metal salt (B6), an alkylamine (B7), an alkyl sulfosuccinate metal salt (B8), and a betaine surfactant (B9).   
     
     
         4 . The sand mold-forming additive of  claim 3 , wherein the surfactant (B) is the alkyl sulfonate metal salt (B1), the alkyl glycoside (B4), or the polyoxyalkylene alkyl ether phosphate metal salt (B5). 
     
     
         5 . The sand mold-forming additive of  claim 1 , further comprising a surfactant (B)
 wherein   the surfactant (B) comprise at least two selected from an alkyl sulfonate metal salt (B1), an alkyl sulfate metal salt (B2), a polyoxyalkylene alkyl ether sulfate metal salt (B3), an alkyl glycoside (B4), a polyoxyalkylene alkyl ether phosphate metal salt (B5), an alkyl benzene sulfonate metal salt (B6), an alkylamine (B7), an alkyl sulfosuccinate metal salt (B8), and a betaine surfactant (B9).   
     
     
         6 . The sand mold-forming additive of  claim 5 , wherein one of the at least two is the alkyl sulfonate metal salt (B1) or the alkyl glycoside (B4). 
     
     
         7 . The sand mold-forming additive of  claim 3 , wherein the surfactant (A) is 1 to 40 parts by mass and the surfactant (B) is 60 to 99 parts by mass when a total content of the surfactant (A) and the surfactant (B) is 100 parts by mass. 
     
     
         8 . A sand mold-forming composition, comprising the sand mold-forming additive of  claim 1 , sand, and a silicate compound (C),
 wherein the   slicate compound (C) comprise at least one selected from sodium silicate, potassium silicate, and lithium silicate   
     
     
         9 . The sand mold-forming composition of  claim 8 , wherein the sand mold-forming additive is 1 to 100 parts by mass with respect to 100 parts by mass of the silicate compound (C). 
     
     
         10 . A method for producing a sand mold, comprising a process A for molding the sand mold-forming composition of  claim 8 . 
     
     
         11 . The method for producing the sand mold of  claim 10 , wherein the process A comprises:
 a step A1 for stirring and foaming the sand mold-forming composition;   a step A2 for filling a molding space with the sand mold-forming composition in a foamed state; and   a step A3 for solidifying the sand mold-forming composition filled in the molding space.   
     
     
         12 . A method for producing a sand mold, comprising:
 a step B1 for preparing the sand mold-forming composition of  claim 8  by mixing and foaming the sand mold-forming additive and the silicate compound (C) and then adding the sand thereto;   a step B2 for filling a molding space with the sand mold-forming composition; and   a step B3 for solidifying the sand mold-forming composition filled in the molding space.   
     
     
         13 . A sand mold, comprising:
 the sand mold-forming additive of  claim 1 , sand, and a silicate compound (C)   wherein   the silicate compound (C) comprise at least one selected from sodium silicate, potassium silicate, and lithium silicate.   
     
     
         14 . The sand mold-forming additive of  claim 5 , wherein the surfactant (A) is 1 to 40 parts by mass and the surfactant (B) is 60 to 99 parts by mass when a total content of the surfactant (A) and the surfactant (B) is 100 parts by mass.