Thermosetting binder composition for manufacturing insulation products containing a water-soluble oligomer ester
A thermosetting binder composition containing water and a water-soluble oligomer ester of at least one carbohydrate selected from reducing sugars, non-reducing sugars and hydrogenated sugars, hydrogenated sugars being selected from the group consisting of erythritol, arabitol, xylitol, sorbitol, mannitol, iditol, maltitol, isomaltitol, lactitol, cellobitol, palatinitol, maltotritol and the hydrogenation products of starch hydrolysates or of hydrolysates of lignocellulosic materials; at least one diol; and at least one polycarboxylic acid, the binder composition having a solid matter content ranging between 40% and 80% by weight, the water-soluble oligomer ester accounting for at least 70% by weight of the solid matter of the thermosetting binder composition, and the ratio of the number of hydroxyl groups of all the diols to the number of hydroxyl groups of all the diols and carbohydrates ranging between 5% and 50%.
1 . A thermosetting binder composition containing water and a water-soluble oligomer ester of:
at least one carbohydrate selected from among reducing sugars, non-reducing sugars and hydrogenated sugars, the hydrogenated sugars being selected from the group consisting of erythritol, arabitol, xylitol, sorbitol, mannitol, iditol, maltitol, isomaltitol, lactitol, cellobitol, palatinitol, maltotritol and the hydrogenation products of starch hydrolysates or of hydrolysates of lignocellulosic materials;
at least one diol; and
at least one polycarboxylic acid,
the binder composition having a solid matter content between 40% and 70% by weight, the water-soluble oligomer ester accounting for at least 70% by weight of the solid matter of the thermosetting binder composition, and a ratio of a number of hydroxyl groups of all the diols to a number of hydroxyl groups of all the diols and carbohydrates being between 5% and 50%.
2 . The thermosetting binder composition according to claim 1 , wherein the ratio of the number of hydroxyl groups of all the diols to the number of hydroxyl groups of all the diols and carbohydrates is between 8% and 40%.
3 . The thermosetting binder composition according to claim 2 , wherein the ratio of the number of hydroxyl groups of all the diols to the number of hydroxyl groups of all the diols and carbohydrates is between 10% and 30%.
4 . The thermosetting binder composition according to claim 1 , wherein the diols are C 2-12 aliphatic diols, linear or branched, optionally comprising in the alkyl chain one or more oxygen atoms.
5 . The thermosetting binder composition according to claim 4 , wherein the diols are selected from the group consisting of ethylene glycol, propylene glycol, butanediol, hexanediol, diethylene glycol and triethylene glycol.
6 . The thermosetting binder composition according to claim 4 , wherein the diols are C 2-8 aliphatic diols.
7 . The thermosetting binder composition according to claim 1 , comprising less than 10% by weight, relative to its solid matter content, of free sorbitol.
8 . The thermosetting binder composition according to claim 7 , comprising less than 5% by weight, relative to its solid matter content, of free sorbitol.
9 . The thermosetting binder composition according to claim 1 , wherein the reducing sugars are chosen from monosaccharides, disaccharides, starch hydrolysates having a dextrose equivalent (DE) between 5 and 98, and the hydrolysates of ligno-cellulosic materials.
10 . The thermosetting binder composition according to claim 9 , wherein the dextrose equivalent (DE) is between 15 and 95.
11 . The thermosetting binder composition according to claim 1 , wherein the hydrogenated sugars are selected from the group consisting of xylitol, maltitol, sorbitol and the hydrogenation products of hydrolysates of starch or of lignocellulosic materials.
12 . The thermosetting binder composition according to claim 1 , wherein the at least one polycarboxylic acid is selected from a dicarboxylic acid, a tricarboxylic acid, and a tetracarboxylic acid.
13 . The thermosetting binder composition according to claim 1 , wherein the at least one polycarboxylic acid is citric acid.
14 . The thermosetting binder composition according to claim 13 , wherein a ratio of a total number of acid groups borne by the at least one polycarboxylic acid to the total number of hydroxyl groups borne by all the carbohydrates and the diols is between 30/70 and 70/30.
15 . The thermosetting binder composition according to claim 13 , comprising sodium hypophosphite or hypophosphorous acid.
16 . The thermosetting binder composition according to claim 1 , comprising less than 25% by weight relative to its solid matter content, of free residual polycarboxylic acid.
17 . A method for manufacturing a product based on mineral or organic fibers bonded by an organic binder, said method comprising
(a) preparing a sizing composition by diluting a thermosetting binder composition according to claim 1 with water to a solid matter content between 2 and 10% by weight,
(b) applying the sizing composition to mineral or organic fibers,
(c) forming an assembly of sized mineral or organic fibers, and
(d) heating the assembly of sized mineral or organic fibers until the sizing composition has cured.
18 . The method according to claim 17 , wherein step (a) of preparing the sizing composition comprises adding one or more additives.
19 . The method according to claim 17 , wherein the fibers are mineral fibers and the assembly of fibers is mineral wool.
20 . The method according to claim 17 , wherein the sizing composition, when applied to the mineral or organic fibers, comprises less than 10% by weight, relative to its solid matter content, of free sorbitol.