2-part reactive urethane resin composition and method for producing thereof

Abstract

The 2-part reactive urethane resin composition, when cured, is an open-cell soft polyurethane foam, wherein the average sound absorption coefficient of said polyurethane foam is 30% or more, measured in accordance with JIS A 1405-2:2007 for 63 hertz to 5000 hertz.

1 . A 2-part reactive urethane resin composition prepared from a polyisocyanate component (X) and a polyol-containing component (Y),
 wherein the polyol-containing component (Y) comprises a polyol component (a), catalysts (b), a foam stabilizer (c), an amine compound having primary or secondary amino groups (d), and carbon dioxide (e);   said 2-part reactive urethane resin composition when cured being an open-cell soft polyurethane foam, wherein an average sound absorption coefficient of said polyurethane foam is 30% or more, measured in accordance with JIS A 1405-2:2007 for 63 hertz to 5000 hertz; and wherein   a length of liquid-dripping for the 2-part reactive urethane resin composition is 300 mm or less measured in accordance with the following measuring method:
 an acrylic plate is placed vertically at a position 10 cm away from the discharge position of an injection molding machine, and a mixture of the polyisocyanate component (X) and the polyol-containing component (Y) is discharged from the injection molding machine to the acrylic plate for 0.2 seconds at a rate of 120 g/sec to form an injected product on the acrylic plate; then, 5 minutes after discharge, the length from the highest point to the lowest point in the vertical direction of the injected product on the acrylic board is measured as the liquid-dripping length. 
   
     
     
         2 . The 2-part reactive urethane resin composition according to  claim 1 , wherein the amine compound comprises aliphatic amines, aromatic amines, or alicyclic amines. 
     
     
         3 . The 2-part reactive resin composition according to  claim 1 , wherein the molecular weight of the amine compound is from 33 to 220. 
     
     
         4 . The 2-part reactive resin composition according to  claim 1 , wherein the amine compound has primary or secondary amino groups. 
     
     
         5 . The 2-part reactive urethane resin composition according to  claim 1 , wherein the content of the amine compound is from 1 to 15 parts by mass based on 100 parts by mass of the polyol component (a). 
     
     
         6 . The 2-part reactive urethane resin composition according to  claim 1 , wherein the content of said carbon dioxide is from 0.5 to 5 parts by mass based on 100 parts by mass of the polyol component (a). 
     
     
         7 . The 2-part reactive urethane resin composition according to  claim 1 , wherein the content of amine carbonate formed of the amine compound and carbon dioxide is from 1.5 to 20 parts by mass based on 100 parts by mass of the polyol component (a). 
     
     
         8 . The 2-part reactive urethane resin composition according to  claim 1 , wherein the polyisocyanate component (X) is at least one selected from the group consisting of diphenylmethane diisocyanate, polymethylene polyphenyl polyisocyanate, and modifications thereof. 
     
     
         9 . The 2-part reactive urethane resin composition according to  claim 1 , wherein cream time of the mixture of the polyisocyanate component (X) and the polyol-containing component (Y) is 1 second or less. 
     
     
         10 . The 2-part reactive urethane resin composition according to  claim 1 , wherein the core density of the polyurethane foam is from 10 to 110 kg/m 3 . 
     
     
         11 . The 2-part reactive urethane resin composition according to  claim 1 , wherein an aeration volume of the polyurethane foam is from 3 to 60 L/min, measured in accordance with JIS K 6400-7:2012. 
     
     
         12 . The 2-part reactive urethane resin composition according to  claim 1 , wherein an average diameter of a cell size of the polyurethane foam is 400 nm or less. 
     
     
         13 . The 2-part reactive urethane resin composition according to  claim 1 , wherein an average diameter of a cell size of the polyurethane foam is 350 nm or less. 
     
     
         14 . The 2-part reactive urethane resin composition according to  claim 1 , wherein an average sound absorption coefficient of the polyurethane foam is 40% or more, measured in accordance with JIS A 1405-2:2007 for 500 hertz to 2500 hertz. 
     
     
         15 . The 2-part reactive urethane resin composition according to  claim 1 , which is prepared by injecting the mixture of the polyisocyanate component (X) and the polyol-containing component (Y) from the injection molding machine.