DE659805C - Process for the production of porous, pressed insulating moldings - Google Patents

Process for the production of porous, pressed insulating moldings

Info

Publication number
DE659805C
DE659805C DET47531D DET0047531D DE659805C DE 659805 C DE659805 C DE 659805C DE T47531 D DET47531 D DE T47531D DE T0047531 D DET0047531 D DE T0047531D DE 659805 C DE659805 C DE 659805C
Authority
DE
Germany
Prior art keywords
moldings
porous
production
insulating
pressed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DET47531D
Other languages
German (de)
Inventor
Heinrich Wahls
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
VER KORKINDUSTRIE AKT GES
Original Assignee
VER KORKINDUSTRIE AKT GES
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by VER KORKINDUSTRIE AKT GES filed Critical VER KORKINDUSTRIE AKT GES
Priority to DET47531D priority Critical patent/DE659805C/en
Application granted granted Critical
Publication of DE659805C publication Critical patent/DE659805C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02—Macromolecular compounds
    • C04B26/28—Polysaccharides or derivatives thereof

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Thermal Insulation (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Description

Verfahren zur Herstellung von porigen, gepreßten Isolierformlingen Gegenstand der Erfindung ist ein Verfahren zur Herstellung von porigen, gepreßten Isolierformlingen. Es ist bekannt, Isolierformlinge im. Gießverfahren dadurch herzustellen, daß anorganische pulverförmige Isolierstoffe mit gasentwickelnden Stoffen, wie z. B. Bicarbonat u. dgl., vermischt werden, wobei diese Stoffe in Gegenwart von Wasser und in Wärme Gas entwickeln. Diese bekannten Gießverfahren gestatten jedoch nicht, Wandstärken der Isolierformlinge von z. B. 10, 15 oder 2o mm herzustellen. Bei solchen geringen Wandstärken reißen beim Trocknen die Formlinge, und das- Gefüge solcher .Erzeugnisse wird zerstört. Nach den bekannten Verfähren werden solche Isolierformlinge aus pulverförmigen anorganischen Rohstoffen in Wandstärken von 25 mm aufwärts hergestellt.Process for producing porous, pressed insulating moldings The invention relates to a process for producing porous, pressed insulating moldings. It is known that insulating moldings in the. Casting process to produce that inorganic powdery insulating materials with gas-evolving substances, such as. B. bicarbonate and the like., Are mixed, these substances develop gas in the presence of water and heat. However, these known casting methods do not allow wall thicknesses of the insulating moldings of z. B. 10, 15 or 2o mm. With such small wall thicknesses, the moldings tear during drying, and the structure of such products is destroyed. According to the known method, such insulating moldings are produced from powdered inorganic raw materials with wall thicknesses of 25 mm and up.

Bei dem Verfahren gemäß der Erfindung wird dieser Übelstand abgestellt, und mittels des neuen Verfahrens sind Formlinge geringerer Wandstärke herstellbar. Bei dem Verfahren wird gemäß der Erfindung als gas. .entwickelnder und härtender Stoff Formaldehyd verwendet. Das Verfahren gemäß der Erfindung beruht auf der Beobachtung, daß Formaldehyd (CH20) in Gegenwart von Wasser und Kartoffelflocken, Kartoffelwalzmehl o. dgl. unter Anwendung von Wärme ,eine überaus feine Gasentwicklung liefert, die @es gestattet, gepreßte, porige Isolierformlinge aus anorganischen pulverförmigen Isolierrohstoffen, wie z. B. Kieselgur, Lichtstaub u. dgl., herzustellen.In the method according to the invention, this drawback is eliminated, and by means of the new process, moldings with a smaller wall thickness can be produced. In the method according to the invention as a gas. .developing and hardening Substance formaldehyde used. The method according to the invention is based on the observation that formaldehyde (CH20) in the presence of water and potato flakes, potato flour o. The like. With the application of heat, an extremely fine gas evolution provides, which @es allowed, pressed, porous insulating moldings made of inorganic powdery Insulating raw materials, such as B. kieselguhr, light dust and the like. To produce.

Es ist an sich nicht mehr neu, Isolierformlinge aus Kieselgur, Asbestfasern u. dgl. unter Verwendung von Kaltquellstärke als Bindemittel herzustellen. Ebenso ist es auch allgemein bekannt, aus Stärke und Formaldehyd Preßstoffe herzustellen. Doch handelt es sich bei diesen bekannten Verfahren um die Herstellung von vollen Formkörpern, während gemäß der vorliegenden Erfindung porige Isolierformlinge von geringer Dichte hergestellt werden. Das Verfahren gemäß der Erfindung soll an folgenden zwei Beispielen erläutert werden: Fall I Hochofengichtstaub ioo kg ' Hochofenschlacke, gemahlen ....... 40 kg Körnung 3 bis g m Asbestfasern ....... i kg Kartoffelwalzmehl . . 3 kg Fall II Calcinierte Kieselgur ioo kg . Hochofenschlacke, gemahlen ....... 4o kg Körnung 3 bis 5 mm Asbestfasern . . ..... i kg Kartoffelwalzmehl : . 3 kg Um Isolierformlinge herzustellen, werden die einzelnen Gemische mit einer r o %igen Formäldehydlösung (Handelsbezeichnung: Formalin) leicht angefeuchtet; in .Formen geschüttet und vermittels einer Presse zu den gewünschten Isolierformlingen, z. B. Isolierhalbschalen, rechteckigen oder konischen lsoliersteinen; gepreßt. Der gepreßte Formling bleibt nach dem Pressen f Stunde lang sich selbst überlassen, damit eine gute d gleichmäßige Gasentwicklung eintritt. 71 auf wird der Formling je nach der 71 auf andstärke 3 bis 6 Stunden bei einer Temratur von 6o° C in einem Trockenofen ge-@o@net.In and of itself, it is no longer new to produce insulating moldings from kieselguhr, asbestos fibers and the like using cold swell starch as a binding agent. It is also generally known to produce molded materials from starch and formaldehyde. However, these known processes involve the production of solid moldings, while porous insulating moldings of low density are produced according to the present invention. The method according to the invention will be explained using the following two examples: Case I Blast furnace top dust 100 kg blast furnace slag, ground ....... 40 kg grain size 3 to gm asbestos fibers ....... 1 kg potato milled flour. . 3 kg case II calcined diatomaceous earth 100 kg. Blast furnace slag, ground ....... 40 kg grain size 3 to 5 mm asbestos fibers. . ..... i kg of rolled potato flour:. 3 kg In order to produce insulating moldings, the individual mixtures are slightly moistened with a ro% formaldehyde solution (trade name: formalin); poured into .Formen and by means of a press to the desired insulating moldings, z. B. insulating half-shells, rectangular or conical insulating bricks; pressed. After pressing, the pressed molding is left to its own devices for f hours so that a good and uniform evolution of gas occurs. Depending on the strength, the molding is dried for 3 to 6 hours at a temperature of 60 ° C in a drying oven.

Nach dem Abbinden und Trocknen entsteht Bein außerordentlich leichter Isolierfornrnling, der z. B. bei den angegebenen Mischungsverhältnissen und schneller Arbeitsweise ein Raumgewicht von nur o,6 bzw. o,5 aufweist:After setting and drying, the leg is extraordinarily lighter Isolierfornrnling, the z. B. with the specified mixing ratios and faster Mode of operation has a density of just o.6 or o.5:

Claims (1)

PATENTANSPRÜCHE: Verfahren zur Herstellung von porigen; gepreßten Isolierformlingen, bei dem gasentwickelnde Stoffe mit anorganischen pulverförmigen Isolierstoffen in Gegenwart von Wasser, Stärke und Wärme vermischt werden, diese Mässen geformt und danach getrocknet werden, dadurch gekennzeichnet, daß als gasentwickelnder und die Isolierformlinge härtender Stoff Formaldehyd verwendet wird.PATENT CLAIMS: Process for the production of porous; pressed Isolierformlinge, in which gas-evolving substances with inorganic powdery Insulating materials are mixed in the presence of water, starch and heat, this Must be shaped and then dried, characterized in that as a gas-evolving and formaldehyde is used to harden the insulating moldings.
DET47531D 1936-10-02 1936-10-02 Process for the production of porous, pressed insulating moldings Expired DE659805C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DET47531D DE659805C (en) 1936-10-02 1936-10-02 Process for the production of porous, pressed insulating moldings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET47531D DE659805C (en) 1936-10-02 1936-10-02 Process for the production of porous, pressed insulating moldings

Publications (1)

Publication Number Publication Date
DE659805C true DE659805C (en) 1938-05-12

Family

ID=7562641

Family Applications (1)

Application Number Title Priority Date Filing Date
DET47531D Expired DE659805C (en) 1936-10-02 1936-10-02 Process for the production of porous, pressed insulating moldings

Country Status (1)

Country Link
DE (1) DE659805C (en)

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