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| Method and apparatus for treating organic wastewater |
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| Preparation of an animal feed supplement from fish cannery process waste water |
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Optionally foamed intumescent masses prepared from polyisocyanates, hydroxyl compounds and melamine phosphates
| Details |
Inventors: von Bonin, Wulf; Jonas, Friedrich;
Assignee: Bayer Aktiengesellschaft (Leverkusen, DE)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
The present invention relates to optionally foamed intumescent masses obtained by reacting (1) polyisocyanates with a mixture containing (2) polyethers having an average OH number of from about 150 to 500 and obtained by the chemical addition of alkylene oxides having an ethylene oxide content of from about 50 to 100% by weight to low molecular weight starters, and/or (3) hydroxyl polyesters having an OH number of from about 100 to 350 obtained by the reaction of aliphatic, cycloaliphatic, araliphatic and aromatic polycarboxylic acids having 2 to 10 carbon atoms with at least two polyols selected from two different groups of the three following groups: (a) hydroxyl compounds with a molecular weight of up to about 200 having more than three OH groups, (b) hydroxyl groups with a molecular weight of up to about 150 having three OH groups, and (c) hydroxyl compounds with a molecular weight of up to about 80 having two OH groups, wherein one of the polyols belongs to group (a), and (4) a phosphate of the melamine phosphate type. The invention additionally relates to the use of the intumescent masses for preparing moulded articles or devices for preventive fire protection. |
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DETAILED DESCRIPTION OF THE INVENTION According to the invention, it is preferred to use intumescent masses which have been obtained by the reaction of from about 10 to 70 parts by weight of a polyisocyanate (1) with 100 parts by weight of a mixture containing about 20 to 80% by weight of the above mentioned polyether and/or polyester (2,3) and about 15 to 75% by weight of phosphates of the melamine phosphate type (4) and 0 to 10% by weight of water (5) and/or 0 to 35% by weight of other organic compounds containing isocyanate reactive hydrogen atoms (6).
Particularly preferred are those intumescent masses which are characterized in that the polyisocyanates used are polyphenylene polymethyl polyisocyanates obtainable by aniline-formaldehyde condensation followed by phosgenation (MDI) and those intumescent masses containing phosphates of the melamine phosphate type which are reaction products of about 0.
2 to 1 mol orthophosphoric acid per mol of melamine.
The intumescent masses obtained according to the invention may be flexible and may be foamed.
In the case of the foamed masses, it has surprisingly been found that they may have the character of water resistant, plastic-elastic foamed masses, which means that they may easily be compressed and then recover only slowly to resume their original form.
This unexpected behavior is technically particularly advantageous, for example when the intumescent masses are used in the form of prefinished bands, U-shaped sections or other shaped elements which can easily be introduced into joints or cavities where they subsequently expand so that they completely fill up all the irregularities to seal the gap or space.
Plastic-elastic, water resistant intumescent masses such as are obtained according to the invention are of particular technical interest because the pre-forms obtained from them can be pushed particularly easily into joints or cavities and because they may also be used as wrappings around cables or pipes and their function is in no way impaired by vibrations in their field of application
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