DE7519611U - WOOD CHIPBOARD BONDED WITH SOREL CEMENT - Google Patents

Description

1 ', Fl ANIWOKT ΒΙΠϊ "ANiitRIN:

92Ο6 / Α5

Deutsche Novopan Gesellschaft mbH, 3 ^ 00 Göttingen, Industriestrasse 1

Chipboard bound with sorelzemerite

The invention relates to a particle board bonded with Sorel cement and shows a method at the same time

their manufacture. As is well known, Sorel cement consists of Magnesium oxide, i.e. burnt magnesite, and an aqueous one Fagnesium chloride solution.

A wood chipboard bonded with Sorel cement with a relatively high specific weight has become known from DBGM 7 413. This plate v / eist also a high kn part in Sorel cement.

In the manufacture of stone wood, wood concrete and wood wool panels (See basics of chemistry and chemical technology of wood by W. Spndermann, Akademische Publishing company Geest & Portig K.-G., Leipzig 1936) Is it known, on the one hand, sorel cement-bonded panels the disadvantage of which is that the moisture resistance of the bond is not particularly good

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-P-

and r, lc: r. the y.uellen of having geringe- · mineral ..noeil made: • Avoid, loht plates at FeucLteeinwirkung l ^:: 3t. The wood wool sheets, which are technically produced in considerable volumes, also willow egg - ,, -; oorelze; ner.tr "; irdung, as :; au :; einr; mixture of V:. ;; t.'v ... 1 um '";.;■;; / d and ^ agnes Lumchiorid, on. The firm- : <- ■: ■ ':. t.; eigerii; c ': v. ·! more often. of these flatten only those.:. ·>; Χ! Υ.Γι, "· -ι. Zu. OeL dene. ';E; in itself neither on a ::, wr- ·: οοη r; uf a? 3ie ;; e strength matters. You will ■. ■:.; .- 'in front of r, α .. .ei .: ^f ' leöiglicn al.-, damo slats inserted.

: '-..-- "1,". Jr hi uV .. ^ ibt · - .. also such panels that are: r.bound with Portland cement. Here, however, it is he ·: ¹ .rierii-h, zuir '.- jhst a mineralization of the chips by acc -'. Her "- r :,.:. N. Them with water glass, calcium chloride, /;.-. Treat _..-_ and cement milk to increase the initial - "- · .- ■ ti.-όΛtime. The forming of such plates and: i, - .-. U ::: i; rturir rierselbe require a compared to zev Her ::. Tellur ;; - UoI icher! Panplatten in Flachpreßverf ah- -e :; : ■ ■■ r.e'.r.lioh for a long time. These difficulties of the nus- '·. ·; - r-urue: Avoidance of Portland cement by removing the

Lf ^ '- · :; : · ■ _ .. Hjlzfe; counteracted by the mineralization ■ ir · - :, tr: -. ■ when using Sorel cement as a binding ^! r;: -: middle r .: ο nt on, which is why there is also the Notv.'endig -.,; e-; t 'ie: Mi: .-, - rai: it doesn’t result in the sons’tation.

Mo .'- Τ-- .. '2. 00:55 265 ze igt a nonflammable Woods - "" -, -, url3tte n; it a Sorelzementbindung. This building board is manufactured without pressing and has only a small proportion of wood, which is to be regarded as a filler, so that this board cannot be regarded as chipboard in the more common sense . In addition, these cast stone wood slats are brittle, fragile and heavy, so that only a limited applicability is given.

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The invention is based on the object of creating a chipboard that has the strength and machinability of conventional chipboard and also has better fire behavior. The plate should be producible in a relatively short time and a relatively low specific weight, so preferably below 0.9 g / cnr '^ f. The source behaves like this Boards should be better than the well-known sorel cement-bound wood wool boards.

According to the invention, this is achieved in a stone wood panel bonded with Sorel cement in that the wood chips are coated on their surface with water glass precipitated by acids or acidic salts. This improves the swelling behavior of the plates. With a particular advantage the wood chips used correspond in their dimensions and their arrangement in the plate to those of the usual chips used in the flat pressing process. The chipboard can therefore be used on the existing systems without further ado.

Particularly good results are achieved if the chipboard about from

100 parts by weight

20 parts by weight

6 parts by weight

75 parts by weight

wood

Water glass concentrated hydrochloric acid magnesium oxide

50 parts by weight of magnesium chloride (20% strength) are made.

It is also possible to have multiple layers in different layers Chipboard use different recipes to take into account the properties in each layer

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to act. It is advisable to use the Deeksvhi · ■!, '. E ·. using 100 parts by weight of wood and some parts by weight of Portland cement. Cement bond is replaced here by Portland cement bond, while the middle class for example:; ea .. about 100 parts by weight of wood, 20 parts by weight of AH.-.sergl.ir ('K ^ -U :), 20 parts by weight Magnesium chloride (? 0 # -ig), 75 rack ?: N- ·> χη. oxide and 50 parts by weight of magnesium chloride (.? 0 / _; -i _r '; mr ^ e. lei: t are.

The manufacture of the sorelzement ^ euundeiier. H '".,:?.;> N .: \ : -.' .. ter. Is thus possible

that the shavings are mixed with water glass and then added to the water glass. Sourer: or sour .'hl ze :. · addition of Sorel carried zementeis and hu; ^.e: · the c ::;> ehandelten chips moldings formed in: n -I known manner under the action of - is made on the chips, whereupon Hnschlie.'5er..i 'Heat unn .vruc / to plate ;. to be cured. The hardening under heat and pressure corresponds to the usual manufacture of chipboard, so that the existing flat pressing systems are ideally suited for carrying out the manufacturing process, or only require a corresponding adjustment.

Hydrochloric acid, formic acid, potassium chloride or excess magnesium chloride are used as acids or acidic salts. It is also possible to use the Sorel cement partially or in layers with Portland cement alone or Portland cement to replace with hardening synthetic resins in order to reduce the cost of production and improve the properties of the panels to act in a targeted manner.

To improve the throwing power of the chip mixture mixed with Sorel cement, clay powder, kieselguhr or

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Tal Kurn added. These fillers or extenders :.he. a weight fraction of 10 to about $ 50 exhibit.

In the following the invention is illustrated by means of some exemplary embodiments further explained.

Example 1 :

100 Ge '. · .-. parts of wood in chip form with the usual dimensions (ti. * -: 10 mm long, up to 5 mm wide and up to 1 mm the κ) are mixed with 20 parts by weight of water glass (40 # solution) so that the surface of the Holzsp-'ine is encased in the water glass: 6 parts by weight of concentrated hydrochloric acid are then added to cause the water glass to precipitate on the wood surface. Only then is the mixture of 75 parts by weight of magnesium oxide and 50 parts by weight of magnesium chloride in 20% solution added, which leads to the cement bond. The chipboard scattered therefrom is exposed to the action of heat and pressure in a conventional flat press and hardened. The resulting board can be screwed and nailed, has a relatively low specific weight due to the high wooden cover, has a sufficiently low swelling capacity for many applications and, above all, shows an improved fire behavior due to the mineral bond.

Example 2:

When producing a three-layer chipboard, the Sorel cement binding of the surface courses by a Portland cement bond replaced. This is possible because in the

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Cover layers ν; 'during the flattening of the heat can be fed better than in the middle class. The top layer has about twice the weight of Portland cement compared to the proportion of wood chips. In the middle class, the Sorel cement bond is used, if ice is wise

100
20th
20th
75

Gev Gev Gev Gev /

50 wt

.Parts of wood

.Share water glass

. parts calcium chloride (£ 20)

parts magnesium oxide

parts of magnesium chloride (20 #)

The immediately hardening Sorel cement bond gives a sufficient Initially firm. The portland cement bond also hardens in large part during manufacture in the flat press.

In the drawing, Fig. 1, is that bound with Sorel cement Chipboard 1 shown.

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03/10/77

Claims (4)

1. Chipboard bonded with Sorel cement, thereby characterized in that the wood chips on their surface with precipitated by acids or acidic salts Are coated with water glass. 2. Chipboard according to claim 1, characterized in that that the chips in their dimensions and their arrangement in the plate those of the usual correspond to the chips used in the flat pressing process. 3. Chipboard according to claim 1, characterized in that g e mark chnet that they are about out 100 parts by weight of wood 20 parts by weight of water glass (4o #) 6 parts by weight of concentrated hydrochloric acid 75 parts by weight of magnesium oxide 50 parts by weight of magnesium chloride consists. 4. Chipboard according to claim 1, characterized in that in a multi-layer structure Board the top layers about 100 parts by weight of wood and 200 parts by weight of Portland cement and the middle layer about \ 00 parts by weight of wood 20 parts by weight water glass (40 #) 20 parts by weight of potassium chloride (20%) 75 parts by weight of magnesium oxide 50 parts by weight of magnesium chloride (20%) exhibit. 7519611 io.03.77