Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Of inorganic materials
Patent
1981-11-27
1984-01-10
Anderson, Philip E.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Of inorganic materials
106 75, 106 83, 106 84, 106 88, 106122, 264 50, C04B 2110, C04B 3516
Patent
active
044252919
ABSTRACT:
A method for the production of a more water-resistant foamed element from waterglass consisting essentially of the steps of mixing together a major amount of an alkali metal silicate solution, with inorganic fillers, at least one alkali-resistant wetting agent in an amount sufficient to form a stable foam, at least one compound capable of hardening a waterglass foam in an amount sufficient to cause said alkali metal silicate to harden, and sufficient natural latex dispersion to cause the foamed element to have a greater water resistance, mechanically foaming said mixture by the incorporation of an inert gas thereon, filling the resultant foam into an element form capable of disassembly, curing said foam in said form, and recovering a more water-resistant foamed and cured element. Preferably the natural latex dispersion is employed in a 50% dispersion in an amount of from 0.2% to 30% by weight, preferably from 0.2% to 10% by weight, based on the total mixture. The alkali metal silicate solution used has, in the case of sodium silicate, a solids content of about 27% to 43% by weight at an SiO.sub.2 /Na.sub.2 O molar ratio of about 4 : 1 to 3 : 1 and in the case of potassium silicate a solids content of about 20% to 36% by weight at an SiO.sub.2 /K.sub.2 O molar ratio of about 4 : 1 to 3.4 : 1, it being possible to use any desired mixture ratios of the mentioned alkali metal silicates. The mixture may optionally contain an addition of 0.1% to 2.5% by weight, preferably from 1% to 2% by weight of B.sub.2 O.sub.3. Preferably the wetting agent added to the mixture is an anionic tenside, such as a sodium C.sub.14-16 alkylsulfonate, in an amount of from 0.1% to 10% by weight, preferably from 4% to 6% by weight in the form of a 30% aqueous solution. The fillers to be added to the mixture are inorganic compounds of light specific gravity in a grain size up to 0.1 mm and in an amount of up to 50% by weight, preferably from 10% to 20% by weight. The hardeners are preferably proportioned into the mixture during foaming in amounts of from 1% to 10% by weight, preferably from 2% to 6% by weight. The preferred hardener is glycerine triacetate.
REFERENCES:
patent: 3508940 (1970-04-01), Webb
patent: 3707385 (1972-12-01), Kraemer et al.
patent: 3719510 (1973-03-01), Temple et al.
patent: 3782982 (1974-01-01), Pierson et al.
patent: 3850650 (1974-11-01), Von Bonin et al.
patent: 3864137 (1975-02-01), von Bonin et al.
Chemical Abstracts, "Moldings of Foamed Water Glass" Karl Weber-8/6/70-(corres. to 1905340).
Beer Gunter
Friedemann Wolfgang
Kupfer Manfred
Pesch Wolfgang
Anderson Philip E.
Hansawerke Lurmann, Schutte & Co.
Henkel Kommanditgesellschaft auf Aktien
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