Textile structure based on glass fibers for acoustic ceiling or acoustic wall panel
The invention relates to a textile structure, intended to be used as a sound-absorbing structure in acoustic ceiling panels and/or acoustic wall panels, consisting of (a) a nonwoven mat of glass fibers bound by a thermoset binder, the nonwoven mat having a surface density of between 20 and 200 g/m 2 and (b) a continuous acoustic layer comprising from 80% to 95% by weight of particles, preferably mineral particles, and from 5% to 20% by weight of a thermoplastic polymer and/or elastomer binder, the textile structure having an open porosity of greater than 3%, preferably between 4% and 60%, and a static airflow resistance (determined according to the standard ISO 9053) of between 1000 and 3000 N·s·m −3 , said continuous acoustic layer at least partially impregnating said nonwoven mat, and the particle size distribution of the particles having a D 10 of between 0.1 and 0.5 μm. It also relates to a process for manufacturing such a textile structure and to a ceiling panel or wall panel coated on one of these faces with such a textile structure.
1 . A textile structure, comprising:
(a) a nonwoven mat of glass fibers bound by a thermoset binder, wherein the nonwoven mat has a surface density of between 20 and 200 g/m2; and
(b) a continuous acoustic layer comprising from 80% to 95% by weight of mineral particles and from 5% to 20% by weight of an elastomer and/or thermoplastic polymer binder,
wherein the textile structure has an open porosity of greater than 3%, and a static airflow resistance, determined according to the standard ISO 9053 of between 1000 and 3000 N·s·m −3 ,
wherein said continuous acoustic layer at least partially impregnates said nonwoven mat, and
wherein either:
a particle size distribution of the mineral particles is a unimodal distribution having a median diameter by volume D 50 determined by laser particle size analysis of between 0.8 and 1.5 μm, a D 10 of between 0.1 and 0.5 μm, and a D 98 of between 5.5 and 6.5 μm, or
a particle size distribution of the mineral particles is an at least bimodal distribution with a first mode located between 0.5 and 2.0 μm and a second mode located between 4 and 25 μm, and a D 10 of between 0.1 and 0.5 μm.
2 . The textile structure as claimed in claim 1 , wherein the continuous acoustic layer has a surface density of between 100 g/m 2 and 400 g/m 2 .
3 . The textile structure as claimed in claim 1 , wherein the nonwoven mat has a surface density of between 25 and 150 g/m 2 .
4 . The textile structure as claimed in claim 1 , wherein at least 90% by number of the glass fibers forming the nonwoven mat have a length of between 5 mm and 12 cm.
5 . The textile structure as claimed in claim 1 , wherein the glass fibers forming the nonwoven mat have an average diameter of between 3 and 30 μm.
6 . The textile structure as claimed in claim 1 , wherein the textile structure has an open porosity between 4% and 60%.
7 . The textile structure as claimed in claim 1 , wherein the continuous acoustic layer has a surface density of between 150 g/m 2 and 350 g/m 2 .
8 . The textile structure as claimed in claim 1 , wherein the nonwoven mat has a surface density of between 30 and 100 g/m 2 , and wherein at least 90% by number of the glass fibers forming the nonwoven mat have a length of between 1 cm and 11 cm.
9 . The textile structure as claimed in claim 1 , wherein the mineral particles are:
based on at least one selected from the group consisting of titanium oxide, magnesium oxide and/or aluminum oxide;
made of calcium carbonate; or
selected from the group consisting of kaolins, dolomites, and talcs.
10 . The textile structure as claimed in claim 1 , wherein the glass fibers forming the nonwoven mat have an average diameter of between 5 and 20 μm.
11 . The textile structure as claimed in claim 1 , wherein said structure consists of said nonwoven mat of glass fibers bound by a thermoset binder and said continuous acoustic layer.
12 . The textile structure as claimed in claim 1 , wherein the textile structure has a static airflow resistance, determined according to the standard ISO 9053 of between 1198 and 3000 N·s·m −3 .
13 . The textile structure as claimed in claim 1 , wherein the particle size distribution of the mineral particles is a unimodal distribution having a median diameter by volume D 50 determined by laser particle size analysis of between 0.8 and 1.5 μm, a D 10 of between 0.1 and 0.5 μm, and a D 98 of between 5.5 and 6.5 μm.
14 . The textile structure as claimed in claim 1 , wherein the particle size distribution of the mineral particles is an at least bimodal distribution with a first mode located between 0.5 and 2.0 μm and a second mode located between 4 and 25 μm, and a D 10 of between 0.1 and 0.5 μm.
15 . A process for manufacturing a textile structure as claimed in claim 1 , comprising
applying a layer of an aqueous impregnating composition to at least one face of a nonwoven mat of glass fibers bound by a thermoset binder,
wherein the nonwoven mat has a surface density of between 20 and 200 g/m 2 , and
wherein the aqueous impregnating composition comprises a mixture of 80% to 95% by weight of solids of mineral particles and of 5% to 20% by weight of solids of a thermoplastic polymer and/or elastomer binder in latex form, wherein the aqueous impregnating composition has a solids content of between 35% and 70% by weight, and wherein either:
a particle size distribution of the mineral particles is a unimodal distribution having a median diameter by volume D 50 determined by laser particle size analysis of between 0.8 and 1.5 μm, a D 10 of between 0.1 and 0.5 μm, and a D 98 of between 5.5 and 6.5 μm, or
a particle size distribution of the mineral particles is an at least bimodal distribution with a first mode located between 0.5 and 2.0 μm and a second mode located between 4 and 25 μm, and a D 10 of between 0.1 and 0.5 μm; and
drying and/or crosslinking the layer of the aqueous impregnating composition so as to obtain a continuous acoustic layer comprising from 80% to 95% by weight of mineral particles and from 5% to 20% by weight of an elastomer binder.
16 . The process as claimed in claim 15 , wherein the nonwoven mat has a loss on ignition of between 5% and 40% by weight.
17 . The process as claimed in claim 15 , wherein the nonwoven mat has a static airflow resistance, determined according to the standard ISO 9053, of less than 50 N·s·m −3 and an air permeability of between 5000 and 6000 L/(m 2 ·s).
18 . The process as claimed in claim 15 , wherein the aqueous impregnating composition has a solids content of between 45% and 70% by weight.
19 . A laminated acoustic ceiling panel or acoustic wall panel, comprising:
a board made of a rigid material comprising a plurality of perforations; and
a textile structure as claimed in claim 1 , bonded to a single face of the perforated board so as to seal all of the perforations.
20 . The laminated panel as claimed in claim 19 , wherein the rigid material of the board is at least one selected from the group consisting of plaster, a metal, and a plastic.