Heat-insulating sound-absorbing material, and partition wall

Abstract

Provided are a heat-insulating and sound-absorbing material improved in construction workability, and a partition wall in which degradation in sound insulation performance is suppressed. The heat-insulating and sound-absorbing material 1 is comprised of an agglomerate of inorganic fibers, wherein the agglomerate has a density of 10 to 20 kg/m3 and the inorganic fibers of the agglomerate have a length-weighted average fiber diameter of 2.0 to 8.7 μm, and wherein the agglomerate contains: 20 to 66% of inorganic fibers having a length-weighted average fiber diameter of less than 4.0 μm; and 13 to 58% of inorganic fibers having a length-weighted average fiber diameter of 7.0 μm or more. The partition wall comprises a hollow wall portion, and the above heat-insulating and sound-absorbing material installed in the hollow wall portion.

1 . A heat-insulating and sound-absorbing material comprised of an agglomerate of inorganic fibers,
 wherein the agglomerate has a density of 10 to 20 kg/m 3 , and the inorganic fibers of the agglomerate have a length-weighted average fiber diameter of 2.0 to 8.7 μm, and   wherein the agglomerate contains: 20 to 66% of inorganic fibers having a length-weighted average fiber diameter of less than 4.0 μm; and 13 to 58% of inorganic fibers having a length-weighted average fiber diameter of 7.0 μm or more, wherein a sum of respective percents of the inorganic fibers having a length-weighted average fiber diameter of less than 4.0 μm, inorganic fibers having a length-weighted average fiber diameter of 4.0 μm to less than 7.0 μm, and the inorganic fibers having a length-weighted average fiber diameter of 7.0 μm or more is 100%.   
     
     
         2 . The heat-insulating and sound-absorbing material as recited in  claim 1 , wherein the agglomerate comprises a first layer and a second layer which are laminated together and is formed in a plate-like shape, wherein inorganic fibers of the first layer have a length-weighted average fiber diameter greater than that of inorganic fibers of the second layer by 0.1 to 3.0 μm. 
     
     
         3 . The heat-insulating and sound-absorbing material as recited in  claim 1 , wherein the agglomerate comprises a first layer, a second layer and a third layer which are laminated together in this order and is formed in a plate-like shape, wherein inorganic fibers of the first layer and the third layer have a length-weighted average fiber diameter greater than that of inorganic fibers of the second layer by 0.1 to 3.0 μm. 
     
     
         4 . The heat-insulating and sound-absorbing material as recited in  claim 1 , wherein the agglomerate comprises a plurality of layers which are laminated together and is formed in a plate-like shape, wherein inorganic fibers of an outermost one of the plurality of layers have a length-weighted average fiber diameter of 4.3 to 7.0 μm. 
     
     
         5 . The heat-insulating and sound-absorbing material as recited in  claim 1 , wherein the inorganic fibers of the agglomerate have a length-weighted average fiber diameter of 3.8 to 5.3 μm. 
     
     
         6 . The heat-insulating and sound-absorbing material as recited in  claim 1 , wherein the agglomerate contains the inorganic fibers having a length-weighted average fiber diameter of 7.0 μm or more, in an amount of 13 to 33%. 
     
     
         7 . The heat-insulating and sound-absorbing material as recited in  claim 1 , wherein the agglomerate contains the inorganic fibers having a length-weighted average fiber diameter of less than 4.0 μm, in an amount of 41 to 66%. 
     
     
         8 . The heat-insulating and sound-absorbing material as recited in  claim 1 , wherein the inorganic fibers are glass wool. 
     
     
         9 . The heat-insulating and sound-absorbing material as recited in  claim 1 , wherein the agglomerate contains a binder for agglomerating the inorganic fibers, in an amount of 1.0 to 8.5% by weight, with respect to an overall weight of the agglomerate, the binder having a binder strength of 3.6 to 6.1 N/mm 2 . 
     
     
         10 . The heat-insulating and sound-absorbing material as recited in  claim 9 , wherein the binder includes a thermo-setting resin curable by a reaction selected from the group consisting of amidation reaction, imidization reaction, esterification reaction and transesterification reaction. 
     
     
         11 . A partition wall comprising a hollow wall portion, and the heat-insulating and sound-absorbing material as recited in  claim 1 , installed in the hollow wall portion. 
     
     
         12 . The partition wall as recited in  claim 11 , which comprises:
 a wall base comprising
 a lower runner disposed on a floor structure, 
 an upper runner fixed to an upper story structure, and 
 studs built up vertically between the lower runner and the upper runner, by a single-runner and staggered-stud construction method, a single-runner and common-stud construction method, a single-runner and common-stud construction method using a staggered backing pad arrangement, a single-runner and staggered-stud construction method using a staggered backing pad arrangement, or a double-runner and parallel-stud construction method; and 
 surface members installed on each of transversely opposite sides of the wall base to extend from the floor structure to the upper story structure. 
   
     
     
         13 . The partition wall as recited in  claim 12 , wherein the surface member is comprised of a board of a noncombustible material or quasi-noncombustible material, or of a laminate comprising the board. 
     
     
         14 . The partition wall as recited in  claim 12 , wherein the surface member is comprised of a gypsum or fiber-reinforced gypsum board, or of a laminate comprising the gypsum or fiber-reinforced gypsum board. 
     
     
         15 . The partition wall as recited in  claim 13 , wherein the surface member has a thickness of 20 mm or more.