Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1997-11-14
1999-07-06
Lusignan, Michael
Coating processes
With post-treatment of coating or coating material
Heating or drying
2065241, 65451, 4274432, 524594, 524546, B05D 118, B05D 302
Patent
active
059195282
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for preparing a mineral wool product. The products according to the invention are intended for use as for instance thermal and fire insulation, fire protection, noise reduction and regulation growth media reinforcement of other materials such as plastics, and fillers. In particular the present invention relates to method for manufacturing a mineral wool product wherein use is made of a phenol-formaldehyde resin as curable binder.
2. Description of Related Art
Resin preparations based on phenol-formaldehyde resin are well known in the art as thermocurable binders. The resin preparation can be used in a non-polymerized or partly polymerized form. The resin preparation is atomized into a gas flow and after contact with mineral fibres is deposited thereon and cured by a temperature treatment, whereby the mineral wool-containing fibres are mutually joined by the cured resin.
The phenol-formaldehyde resin contains both phenol and formaldehyde in a molar ratio of 1:2.8 and more, such as up to 1.6. In general the quantity of formaldehyde is over the stoichiometric amount, such as in the ratio 1:3.1 to 1:5, for instance 1:3.4. The excess of formaldehyde avoids the possibility of phenol remaining present in gaseous form in the gas flow and being emitted to the environment after atomizing of the resin preparation and evaporation of the water present therein.
The resin preparation generally also contains ammonia for the purpose of binding the excess amount of formaldehyde relative to phenol with the formation of ammine compounds such as hexamethyl tetra-ammine.
A drawback to the use of such a phenol-formaldehyde resin and ammonia-containing aqueous preparation is the emission of ammonia in quantities of up to 200 ppm.
The present invention has for its object to provide a solution to this drawback of ammonia emission which is less expensive than the usual method for removing ammonia from gas, for instance by means of using scrubbers. This is however subject to the condition that the curing of the phenol-formaldehyde resin is substantially not adversely affected and the emission of phenol and/or formaldehyde substantially does not increase.
SUMMARY OF THE INVENTION
The invention is based on the insight that the ammonia emission occurring during use of a phenol-formaldehyde resin or binder in preparation of a mineral wool product can be significantly repressed by neutralizing ammonia in the resin preparation by making use of a sugar compound. The sugar compound may added before the binder is ready for use even before the ammonia is added. According to one preparation procedure the addition of this sugar compound takes place before atomizing of the resin preparation, thereby avoiding due to the reaction of ammonia with the sugar compound ammonia eventual neutralisation and thereby reduction of function as resin stabilizer. Addition of the sugar compound during resin preparation is possible. The resin preparation eventually becomes unstable and unsuitable for use as binder for mineral wool. The invention therefore proposes that the sugar compound and/or the ammonia is added to the resin preparation timely before applying of the resin preparation to the mineral wool.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
An optimal preparation procedure comprises the addition of the ammonia or ammonium as the last component just before applying the resin based binder to the mineral wool.
The method according to the invention therefore provides for manufacture of a product on a basis of mineral wool, including the steps of: containing aqueous preparation;
In one embodiment the method includes: preparation; preparation to the mineral wool; and
In another embodiment the method includes: aqueous preparation; preparation; preparation to the mineral wool; and
Still another embodiment includes: ammonia containing aqueous preparation; preparation to the mineral wool; and
It is noted that it is possible in principle to atomize the sugar
REFERENCES:
patent: 3231349 (1966-01-01), Stalego
patent: 3336185 (1967-08-01), Helbing
Cuypers Jean Marie Wilhelmus
Huijs Mathijs Johannus Anthonius Maria
Husemoen Thor
Lusignan Michael
Rockwool Lapinus B.V.
LandOfFree
Method for manufacturing a mineral wool product does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for manufacturing a mineral wool product, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for manufacturing a mineral wool product will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-897674