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AssigneeSaint-Gobain Isover
InventorsPhilippe Espiard, Bruno Mahieuxe
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Insulating product based on mineral wool sized with a binder based on a phenol-formaldehyde resin, in which the binder comprises, as a mixture: 60 to 90 parts by weight of a phenol-formaldehyde resol having a free formaldehyde content of less than or equal to 25% by weight with respect to the dry weight of resin and a free phenol content of less than or equal to 2.5% by weight with respect to the dry weight of resin, obtained by condensation in basic medium of phenol (P) and formaldehyde (F) in an F/P molar ratio of around 2.5 to 4 until the condensation product neutralized by sulphuric acid has a water dilutability of greater than 500% and less than or equal to 1500%; 10 to 40 parts by weight of urea. Use of such a sizing composition for manufacturing insulating products, while reducing the emissions of ammonia gas on the manufacturing line.
Insulating product based on mineral wool sized with a binder based on a phenol-formaldehyde resin, characterized in that the binder comprises, as a mixture:
Insulating product according to any one of the preceding claims, characterized in that the F/P ratio is around 2.5 to 3.2.
Insulating product according to any one of the preceding claims, characterized in that the resol is obtained by making phenol react with formaldehyde in the presence of a basic catalyst, such as sodium hydroxide, at a temperature of around 50 to 80° C., especially 60 to 75° C., in particular about 70° C., for a time of around 80 to 200 minutes, especially 90 to 150 minutes.
Insulating product according to any one of the preceding claims, characterized in that the resol is neutralized with at least one acid chosen from boric acid or an equivalent borate, sulfamic acid or an equivalent sulfamate, or an amino acid.
Insulating product according to any one of the preceding claims, characterized in that the mixture comprises 60 to 90 parts by dry weight of resol per 40 to 10 parts by weight of urea, preferably at least 65 parts, especially from 70 to 85 parts, by dry weight of resol per at most 35 parts, especially 15 to 30 parts, by weight of urea.
Insulating product according to any one of the preceding claims, characterized in that the binder furthermore includes from 1 to 10 parts by weight of ammonium sulphite per 100 parts by dry weight of resol and of urea.
Sizing composition for an insulating product, characterized in that it comprises, as a mixture:
Dependencies are inferred from the claim text.