NO138801B - PROCEDURE FOR THE PREPARATION OF BENEFITS OF CEMENT BY MIXING CEMENT WITH FORMALDEHYDE RESIN AND WOOD IN FINE DISTRIBUTED FORM - Google Patents

PROCEDURE FOR THE PREPARATION OF BENEFITS OF CEMENT BY MIXING CEMENT WITH FORMALDEHYDE RESIN AND WOOD IN FINE DISTRIBUTED FORM Download PDF

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NO138801B
NO138801B NO743437A NO743437A NO138801B NO 138801 B NO138801 B NO 138801B NO 743437 A NO743437 A NO 743437A NO 743437 A NO743437 A NO 743437A NO 138801 B NO138801 B NO 138801B
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cement
parts
weight
resin
wood
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NO743437A
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Norwegian (no)
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NO138801C (en
NO743437L (en
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Friedrich Josten
Martin Cherubim
Heinz Berndt
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Texaco Ag
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Priority claimed from DE19732353490 external-priority patent/DE2353490C3/en
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Publication of NO743437L publication Critical patent/NO743437L/no
Publication of NO138801B publication Critical patent/NO138801B/en
Publication of NO138801C publication Critical patent/NO138801C/en

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    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/30—Condensation polymers of aldehydes or ketones
    • 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
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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

Description

Oppfinnelsen vedrorer en fremgangsmåte for fremstilling av formdeler av sement, hvori også uorganiske tilsetninger som sand, sten og lignende kan være innblandet. The invention relates to a method for producing molded parts from cement, in which inorganic additives such as sand, stone and the like can also be mixed.

Sementformdeler som plater, ror, bjelker, stener fremstilles som kjent ved at man blander sement eller en blanding av sement og uorganiske tilsetninger med vann, s teiper blandingen i en form og lar den herdne og tar ut de herdnede deler av formen. Den tid som sementen behover for utherd-ning er betraktelig og ved industriell fremstilling av formdeler er den for lang. For å avhjelpe denne ulempe har man tatt ut formdelene fra formen så snart sementen er bundet, således at formdelene var selvbærende og latt dem herdne ferdig utenfor formen. Da denne fremgangsmåte imidlertid krever et ytterligere arbeidstempo og betraktelig volum for lagring av formdelene under herdningen, har man også til sementen ved blandingen tilsatt visse kjemiske stoffer, eksempelvis kalsiumklorid, aluminiumklorid, silikater, kalsiumsul-fat, kobbersulfat, alkalifosfat, boraks, trietanolamin, stiv-else, karboksymetylcellulose, kalsiumligninsulfonat, sukker, garvesyre, gallesyre, humussyre, for å forkorte herdningstiden. De kjente herdningsakseleratorene for sement er imidlertid ikke helt tilfredsstillende. Enten bkes ikke herdnings-hastigheten tilstrekkelig meget eller også innvirker stoffene uheldig på de ferdige delers egenskaper, spesielt på hårdheten. Cement molded parts such as plates, pipes, beams, stones are produced as is known by mixing cement or a mixture of cement and inorganic additives with water, taping the mixture in a mold and letting it harden and removing the hardened parts from the mold. The time that the cement needs to harden is considerable and in the industrial production of molded parts it is too long. To remedy this disadvantage, the mold parts have been removed from the mold as soon as the cement has set, so that the mold parts were self-supporting and allowed to harden completely outside the mold. As this method, however, requires an additional working pace and considerable volume for storing the mold parts during curing, certain chemical substances have also been added to the cement during the mixture, for example calcium chloride, aluminum chloride, silicates, calcium sulphate, copper sulphate, alkali phosphate, borax, triethanolamine, stiff -else, carboxymethyl cellulose, calcium lignin sulphonate, sugar, tannic acid, bile acid, humic acid, to shorten the curing time. However, the known hardening accelerators for cement are not entirely satisfactory. Either the curing speed is not increased sufficiently or the substances adversely affect the properties of the finished parts, especially the hardness.

Fra U.S. patent nr. 2.828.820 er det tidligere kjent at for tetning av oljeborehull å anvende en blanding av hydrau-lisk bindende sement, vann og aceton-formaldehyd-kondensa-sjonsprodukt. Det er kjent at disse blandinger også kan anvendes til overflatebelegg, eksempelvis for belegg av kera-miske rb"r,for gatebelegg, tankforinger o.l. For å forkorte herdningstiden anbefales tilsetning av katalysatorer eller herdningsakseleratorer. From the U.S. patent no. 2,828,820, it is previously known to use a mixture of hydraulically binding cement, water and acetone-formaldehyde condensation product for sealing oil boreholes. It is known that these mixtures can also be used for surface coatings, for example for coating ceramic tiles, for street coverings, tank linings etc. In order to shorten the curing time, the addition of catalysts or curing accelerators is recommended.

Oppfinnelsen har nu til hensikt å tilveiebringe The invention now aims to provide

en fremgangsmåte for fremstilling av formdeler av sement hvori uorganiske tilsetninger kan være tilsatt, hvor herdningen skjer meget hurtigere enn det som tidligere har vært kjent. Formdelene skal etter at herdningen er nådd ha en forbedret boyestyrke. a method for the production of molded parts of cement in which inorganic additives can be added, where the hardening takes place much faster than what has previously been known. After hardening has been achieved, the molded parts must have an improved bending strength.

Oppfinnelsen vedrorer altså en fremgangsmåte til The invention thus relates to another method

å fremstille formdeler av sement ved å blande sement med en formaldehydharpiks og tre i finfordelt form, ferdiggjbring to produce molded parts from cement by mixing cement with a formaldehyde resin and wood in finely divided form, finishing

og herdning ved forhbyet temperatur idet fremgangsmåten er karakterisert ved at på 100 vektdeler sement innblandes 60 - 70 vektdeler tre, og blandingen tilsettes å meget av en vann-opplosning av aceton-formaldehydharpiks med et faststoffinnhold på 40 - 60 vektprosent at på 100 vektdeler sement foreligger 10 - 100 vektdeler tbrrtenkt harpiks, stbpes i en stbpeform og herdnes ved temperaturer mellom 30 og 200°C og ved et trykk mellom atmosfæretrykk og 150 kp/cm 2. and curing at an elevated temperature, the method being characterized in that 60 - 70 parts by weight of wood are mixed into 100 parts by weight of cement, and the mixture is added to a lot of a water solution of acetone-formaldehyde resin with a solids content of 40 - 60 percent by weight, so that 100 parts by weight of cement are present 10 - 100 parts by weight of wet resin, poured into a mold and cured at temperatures between 30 and 200°C and at a pressure between atmospheric pressure and 150 kp/cm 2.

Det er generelt kjent at sementhertiningen er en eksoterm reaksjon og derfor ikke kan akselereres ved opp-varming. Det har nu helt overraskende vist seg at man får It is generally known that cement hardening is an exothermic reaction and therefore cannot be accelerated by heating. It has now surprisingly turned out that you get

en meget stor nedsetning av herdningstiden hvis man blander og varmer sementen med en vannopplbsning eller vann-alkohol-opplbsning av en aceton-formaldehydharpiks, i det fblgende for korthets skyld betegnet AF-harpiks. Dessuten får de ferdige formdeler betraktelig stbrre boyestyrke enn samme formdeler uten AF-harpiks. Ved temperaturer under 30°C, altså de vanlige værelsetemperaturene eller utendbrstempera-turer, gir tilsetning av AF-harpiks til sementen derimot ingen merkbar herdningsakselerasjon og slutthårdhetene blir betraktelig mindre enn på de umodifiserte sementformdeler. a very large reduction in the setting time if you mix and heat the cement with a water solution or water-alcohol solution of an acetone-formaldehyde resin, hereinafter referred to as AF resin for brevity. In addition, the finished molded parts have significantly greater bending strength than the same molded parts without AF resin. At temperatures below 30°C, i.e. the usual room temperatures or outdoor temperatures, adding AF resin to the cement, on the other hand, does not give any noticeable hardening acceleration and the final hardnesses are considerably lower than on the unmodified cement mold parts.

Fortrinnsvis foretas herdningen ved temperaturer mellom 60 og 170°C, og spesielt egnet er en herdningstempe-ratur mellom 140 og 170°C. Etter to timers herdning har formdelene vesentlig hbyere bbyestyrker enn formdeler som er fremstilt av umodifisert sement. Man kan også la herdningen skje ved forhoyet temperatur i opptil 24 timer, hvilket vanligvis medforer en ytterligere forbedring av bbyestyrken. Lengre herdningstider er ikke tenkbare fra bkonomisk synspunkt. Preferably, the curing is carried out at temperatures between 60 and 170°C, and a curing temperature between 140 and 170°C is particularly suitable. After two hours of curing, the molded parts have significantly higher bending strengths than molded parts made from unmodified cement. You can also allow the curing to take place at an elevated temperature for up to 24 hours, which usually results in a further improvement in bond strength. Longer curing times are not conceivable from an economic point of view.

Hvis meget tykke formdeler skal fremstilles eller for ved seriefremstilling å kunne arbeide med kortest mulig takttider (omlbpstider), kan herdningen også skje ved anvendelse av trykk til omkring 150 kp/cm . If very thick molded parts are to be produced or in order to be able to work with the shortest possible cycle times (revolution times) during series production, hardening can also take place by applying pressure to around 150 kp/cm.

På 100 vektdeler sement kan man anvende 10 - 100 vektdeler AF-harpiks, beregnet på harpiksopplbsningens fast-stoff innhold. Fortrinnsvis tilsetter man 30 - 50 vektdeler harpiks til sementen. Som AF-harpiks har det vist seg egnet en ved 20 - 100°C alkalisk kondensert harpiks med et aceton/- formaldehyd-molforhold på 1:1,5-5. Harpiksen anvendes i form av en 30 - 90 vektprosentig opplosning i vann eller vann-alkohol. Som alkohol egner det.seg metanol, propanol, iso-propanol, butanol osv. 60-%ige opplosninger anvendes. I stedet for den rene AF-harpiks kan det også anvendes en harpiks hvori en del, omtrent opptil 25% av acetonen er utbyttet mot en annen med formaldehyd reaktiv monomer. Slike monomerer er eksempelvis karbamid, fehol, substituerte fenoler e'tc. On 100 parts by weight of cement, you can use 10 - 100 parts by weight of AF resin, calculated on the solids content of the resin solution. Preferably, 30 - 50 parts by weight of resin are added to the cement. A resin condensed alkaline at 20 - 100°C with an acetone/formaldehyde molar ratio of 1:1.5-5 has proven suitable as AF resin. The resin is used in the form of a 30 - 90% by weight solution in water or water-alcohol. Suitable alcohols are methanol, propanol, iso-propanol, butanol, etc. 60% solutions are used. Instead of the pure AF resin, a resin can also be used in which a part, approximately up to 25%, of the acetone has been exchanged for another with formaldehyde reactive monomer. Such monomers are, for example, carbamide, fehol, substituted phenols, etc.

For fremgangsmåten ifolge oppfinnelsen kan det anvendes enhver egnet sementtype som f.eks. Portlandsement, masovnsement, sulfatsement, sorrelsement. Som tilsetningsstoffer egner seg nesten alle faste, uorganiske stoffer, som ikke foreligger i altfor grov form. Vanligvis anvendes sand som tilsetning. For the method according to the invention, any suitable type of cement can be used, e.g. Portland cement, blast furnace cement, sulphate cement, sorrel cement. As additives, almost all solid, inorganic substances are suitable, which are not present in excessively coarse form. Sand is usually used as an additive.

I henhold til oppfinnelsen innarbeides i sementen for blandingen med aceton-formaldehydharpiksopplosningen tre i finfordelt form. Man får derved formdeler som fra sement-aceton-formaldehydharpiksblandingen får stor boyestyrke og stor motstandskraft mot mekanisk påkjenning og forvitring, men som har en vesentlig lavere spesifikk vekt og som kan skjæres. According to the invention, finely divided wood is incorporated into the cement for the mixture with the acetone-formaldehyde resin solution. This results in molded parts which, from the cement-acetone-formaldehyde resin mixture, have great flexural strength and great resistance to mechanical stress and weathering, but which have a significantly lower specific weight and which can be cut.

Fra H.S. Deppe "Zur Herstellung und Anwendung zement-gebundener Spanplatten", Holz-Zentralblatt, Stuttgart, nr. 49, 50, er det tidligere kjent at man ved kombinasjon av sement og trespon kan nedsette den spesifikke vekt på formdeler av sement betraktelig og gi dem spesielle mekaniske egenskaper bl.a. også en begrenset skjærbarhet. Det har imidlertid vist seg at disse formdeler herdner altfor langsomt likesom formdeler av sement. Ved forsbk til å drive herdningen ved forhoyet temperatur falt de herdnede plater istykker etter From H.S. Deppe "Zur Herstellung und Anwendung zement-gebundener Spanplatten", Holz-Zentralblatt, Stuttgart, no. 49, 50, it was previously known that by combining cement and wood chips, the specific weight of shaped parts made of cement can be considerably reduced and give them special mechanical properties, i.a. also a limited cutability. However, it has been shown that these molded parts harden much too slowly, just like cement molded parts. When trying to run the hardening at an elevated temperature, the hardened plates fell apart

o o

fremstillingen. the manufacture.

Det har nu vist seg at den bnskede effekt inntrer ved tilsetning av aceton-formaldehydharpiksopplbsninger til blandingen av sement og tre i finfordelt form. Dette var desto mere overraskende da aceton-formaldehydharpiks alene ikke har evne til å binde trespon. It has now been shown that the desired effect occurs when acetone-formaldehyde resin solutions are added to the mixture of cement and wood in finely divided form. This was all the more surprising as acetone-formaldehyde resin alone has no ability to bind wood shavings.

Trepartiklene kan foreligge i form av spon, fibre, mel e.l. og fortrinnsvis anvendes på 100 vektdeler sement 20 - .200 vektdeler finfordelt tre, avhengig av de bnskede egenskaper hos formdelene. Hensiktsmessig tilsettes AF-harpiksen som 30 - 90%-rig vannopplbsning, fortrinnsvis som 40 - 60 vekt-%ig opplbsning i mengder på 20 - 100 vektdeler eller hbyere pr. 100 vektdeler sement, alt avhengig av mengden tre og de bnskede egenskaper. The wood particles can be in the form of shavings, fibres, flour etc. and preferably 20 - .200 parts by weight of finely divided wood are used for 100 parts by weight, depending on the desired properties of the molded parts. Appropriately, the AF resin is added as a 30 - 90% water solution, preferably as a 40 - 60% by weight solution in quantities of 20 - 100 parts by weight or higher per 100 parts by weight of cement, all depending on the amount of wood and the desired properties.

Også ved tilsetning av trepartikler er det mulig It is also possible by adding wood particles

å anvende vannalkoholopplbsninger av AF-harpiksen, men vann-opplbsninger er å foretrekke. Som spesielt egnet har det vist seg å tilsette vann i mengder på 1 - 50 vektdeler be^ regnet på sementen utover vannmengden i AF-harpiksopplbsning-en. to use water-alcohol solutions of the AF resin, but water solutions are preferred. Adding water in amounts of 1 - 50 parts by weight based on the cement over and above the amount of water in the AF resin solution has proven to be particularly suitable.

I forblandingen av sement og tre kan også uorganiske tilsetningsstoffer innarbeides. Fortrinnsvis anvender man asbestfibre, da disse ikke virker ufordelaktig på de gjennom det finfordelte tre tilveiebragte egenskaper. In the premix of cement and wood, inorganic additives can also be incorporated. Asbestos fibers are preferably used, as these do not have a disadvantageous effect on the properties provided through the finely divided wood.

Oppfinnelsen skal forklares nærmere ved hjelp av fblgende eksempler. The invention shall be explained in more detail by means of the following examples.

Eksempel 1- 4 Example 1-4

I disse eksempler ble det fremstilt og undersbkt sement-sponplater i henhold til oppfinnelsen. In these examples, cement chipboards were produced and tested according to the invention.

Eksempel 1 Example 1

En sement-sponplate av 60 vektdeler.sement og 40 vektdeler trespon med en restfuktighet på 2% og med en tilsetning av 24 vektdeler av en 56%-ig aceton-formaldehydharpiks-vannopplbsning ble herdnet i 10 minutter ved 90°C og etter-herdnet deretter i 65 minutter ved 50 - 90°C, dvs. uten ytterligere varmetilfbrsel. Derved ble det dannet en ketonharpiksmodifisert sementsponplate med fblgende egenskaper: A cement chipboard of 60 parts by weight cement and 40 parts by weight wood chips with a residual moisture of 2% and with the addition of 24 parts by weight of a 56% acetone-formaldehyde resin-water solution was cured for 10 minutes at 90°C and post-cured then for 65 minutes at 50 - 90°C, i.e. without further application of heat. A ketone resin-modified cement chipboard with the following properties was thereby formed:

x)' Det engelske uttrykk for tverrstrekkfasthet er "bending strength perpendicular to the plate". V20 betyr at platene ikke er forbehandlet spesielt og V10q at prbveplatene for prbven har ligget 2 timer i kokende vann. x)' The English expression for transverse tensile strength is "bending strength perpendicular to the plate". V20 means that the plates have not been specially pre-treated and V10q that the test plates for the test have been in boiling water for 2 hours.

Lar man en slik plate ytterligere eldes 14 dager ved 20°C, så får platen etter eldring en tverrstrekkfasthet på 5,8 kp/cm og en tverrstrekkfasthet V^qq på 3,9 kp/cm . If such a plate is allowed to age further for 14 days at 20°C, the plate after aging has a transverse tensile strength of 5.8 kp/cm and a transverse tensile strength V^qq of 3.9 kp/cm.

Forsbker man som sammenligning av en sementbland-ing av 60 vektdeler sement og 40 vektdeler trespon med 2% restfuktighet og 24 vektdeler vann, tilsvarende en vanlig vann-sementfaktor på 0,4, å gjennomherde en plate, og likesom ved ovennevnte eksempel herde 10 minutter ved 90°C og 65 minutter ved 50 - 90°C, så skjer det ingen binding. En slik uten aceton-formaldehydharpiks fremstilt plate faller sammen etter fremstillingen. As a comparison, a cement mixture of 60 parts by weight of cement and 40 parts by weight of wood chips with 2% residual moisture and 24 parts by weight of water, corresponding to a normal water-cement factor of 0.4, is tried to harden a plate through, and like in the above example harden for 10 minutes at 90°C and 65 minutes at 50 - 90°C, then no binding occurs. Such a sheet produced without acetone-formaldehyde resin collapses after production.

En sement-vannfaktor på 0,4 betyr at på 100 vektdeler sement anvendes 40 vektdeler vann. A cement-water factor of 0.4 means that 40 parts by weight of water are used for 100 parts by weight of cement.

Eksempel 2 Example 2

En sement-sponplate ble fremstilt av 60 vektdeler sement og 40 vektdeler trespon med en restfuktighet på 2% ved tilsetning av 28 vektdeler av en 37%-ig aceton-formalde-hydvannopplbsning. Utherdningsbetingelsene var 10 minutter ved 90°C og deretter 65 minutter ved 5090°C, dvs. uten ytterligere varmetilfbrsel. Bindemiddelsfaktoren var 0,4, dvs. på 100 vektdeler sement ble det anvendt 40 vektdeler AF-harpiks. Platens egenskaper ble: A cement chipboard was produced from 60 parts by weight of cement and 40 parts by weight of wood shavings with a residual moisture of 2% by adding 28 parts by weight of a 37% acetone-formaldehyde-hydrogen solution. The curing conditions were 10 minutes at 90°C and then 65 minutes at 5090°C, i.e. without additional heat application. The binder factor was 0.4, i.e. 40 parts by weight of AF resin were used for 100 parts by weight of cement. The plate's properties were:

Etter ytterligere lagring i 21 dager var tverrstrekk-kfpa/stcmhe2t.en V2Q 3,4.kp/cm o og tverrstrekkfastheten V10Q 1,4 After further storage for 21 days, the transverse tensile kfpa/stcmhe2t.en V2Q was 3.4.kp/cm o and the transverse tensile strength V10Q 1.4

Eksempel 5 Example 5

En sementsponplate likeledes av 60 vektdeler sement og 40 vektdeler trespon "ble fremstilt med en bindemiddels-faktor på 0,4 og med 37 vekt-% av ketonharpiksopplbsningen, samt med sponens naturlige fuktighetsinnhold på 10% uten fortbrkning. Dertil ble det sprbytet på sponene ytterligere 10 vekt-% vann. Verdiene på denne plate kan sammenlignes med den i eksempel 2 fremstilte sement-sponplate. Utherdningsbetingelsene var de samme som i eksempel 1. Platen hadde fblgende egenskaper: A cement chipboard was likewise made of 60 parts by weight of cement and 40 parts by weight of wood chips "with a binder factor of 0.4 and with 37% by weight of the ketone resin solution, as well as with the chips' natural moisture content of 10% without decomposition. In addition, the chips were further changed 10% water by weight. The values on this board can be compared with the cement chipboard produced in example 2. The curing conditions were the same as in example 1. The board had the following properties:

Påfallende er bkningen av tverrstrekkfastheten vioo med mer enn 1 kp/cm Striking is the bending of the transverse tensile strength vioo by more than 1 kp/cm

Eksempel 4 Example 4

En sement-sponplate ble fremstilt av 60 vektdeler sement og 40 vektdeler trespon med en restfuktighet på ca. 2%, samt 24 vektdeler av en 56%-ig aceton-formaldehydharpiks-vannopplbsning og ble herdet 30 minutter ved 110°C. Derved fremkom en ketonharpiksmodifisert sement-sponplate med fblgende egenskaper: A cement chipboard was made from 60 parts by weight of cement and 40 parts by weight of wood shavings with a residual moisture of approx. 2%, as well as 24 parts by weight of a 56% acetone-formaldehyde resin-water solution and was cured for 30 minutes at 110°C. This resulted in a ketone resin-modified cement chipboard with the following properties:

Fremstillingen av en aceton-formaldehydharpiks, som er spesielt egnet for anvendelse ved fremgangsmåten ifolge oppfinnelsen, ble foretatt på fblgende måte: I et 120 liters rbreverk av edelstål ble det blandet 42,1 kg 37%-ig formaldehyd-vannopplbsning og 15,15 kg teknisk ren aceton. Etter oppvarmning ved 60°C i rundt 5 minutter ble det tilsatt i lbpet av 30 minutter 270 cn<r >50%-ig natronlut. En eksoterm reaksjon foregitt, idet temperaturen på innholdet i rbreverket steg til 80°C. The production of an acetone-formaldehyde resin, which is particularly suitable for use in the method according to the invention, was carried out in the following way: In a 120 liter stainless steel retort, 42.1 kg of 37% formaldehyde-water solution and 15.15 kg were mixed technically pure acetone. After heating at 60°C for around 5 minutes, 270 ml of 50% caustic soda was added over a period of 30 minutes. An exothermic reaction took place, as the temperature of the contents of the reactor rose to 80°C.

Etter en kondensasjonstid på 2 timer ved 80°C foregikk en avkjbling og ved en sumptemperatur på ca. 40 - 45°C ble det avdrevet ca. 23 1 med vannstrålevakuum. Slutt-viskositeten bestemt ifblge DIN 53 211 gikk opp til 40 - 45 sekunder i 6 mm DIN-beger ved 20°C. Destillasjonstiden varte omkring 1 time. Det resulterende utbytte ble 26 kg harpiks med et faststoffinnhold på ca. 76%. After a condensation time of 2 hours at 80°C, a cooling took place and at a sump temperature of approx. 40 - 45°C, approx. 23 1 with water jet vacuum. The final viscosity determined according to DIN 53 211 went up to 40 - 45 seconds in a 6 mm DIN beaker at 20°C. The distillation time lasted about 1 hour. The resulting yield was 26 kg of resin with a solids content of approx. 76%.

Ytterligere data for harpiksen var: Additional data for the resin was:

<x>^ Ved plateprbven (Stroke-Cure-Test) oppvarmes en bestemt mengde harpiks i et kar på en varmeplate til smelte-temperatur og smeiten omrores ved denne temperatur med en stav. Den tid bestemmes som medgår til harpiksen ikke lenger kleber fast ved staven eller lett kan strykes av fra staven. <x>^ In the plate test (Stroke-Cure-Test), a certain amount of resin is heated in a vessel on a hot plate to melting temperature and the melt is stirred at this temperature with a rod. The time is determined until the resin no longer sticks to the rod or can be easily wiped off from the rod.

Eksempel 5 Example 5

Ved dette eksempel ble det herdet innen det spesielt foretrukne temperaturområde. In this example, it was cured within the particularly preferred temperature range.

En sement-sponplate av 60 vektdeler sement og 40 A cement chipboard of 60 parts by weight of cement and 40

vektdeler trespon med en restfuktighet på 2%, samt en til- parts by weight wood shavings with a residual moisture of 2%, as well as an additional

setning av 24 vektdeler av en 56%-ig aceton-formaldehydhar-piksvannopplbsning med en pressfaktor på 1,0, 1,3 og 1,6 min/mm platetykkelse ved en platetykkelse på 16 mm ble herdet. deposition of 24 parts by weight of a 56% acetone-formaldehyde resin water solution with a pressure factor of 1.0, 1.3 and 1.6 min/mm plate thickness at a plate thickness of 16 mm was cured.

Pressfaktoren er presstiden pr. mm platetykkelse. The pressure factor is the pressure time per mm plate thickness.

Herdningstemperaturen var 145°C og presstrykket The curing temperature was 145°C and the pressing pressure

22 kp/cm . Ved forsbket fremkom sement-sponplater med fblgende egenskaper: 22 kp/cm. During the trial, cement chipboards were also found following properties:

Som det fremgår medfbrer oppfinnelsen et betrakte- As can be seen, the invention entails a consider-

lig teknisk fremskritt. Den muliggjbr fremstilling av form- like technical progress. It enables the production of form-

deler på basis av sement på vesentlig kortere tid og med bedre styrkeverdier enn det som tidligere har vært mulig. Med fremgangsmåten ifblge oppfinnelsen kan fremstillingskapasi- parts based on cement in a significantly shorter time and with better strength values than has previously been possible. With the method according to the invention, production capacity can

teten for sementformdeler bkes betraktelig og ved bedre styrkeverdier oppnås utvidelse av anvendelsesområdet for formdeler på basis av sement. the strength of cement molded parts is considerably increased and with better strength values, an expansion of the application area for cement-based molded parts is achieved.

Claims (4)

1. Fremgangsmåte for fremstilling av formdeler av sement ved blanding av sement med formaldehyd-harpiks og tre i finfordelt form,.ferdiggjøring og herdning ved forhøyet temperatur, karakterisert ved at på 1001. Method for the production of molded parts from cement by mixing cement with formaldehyde resin and wood in finely divided form, finishing and hardening at an elevated temperature, characterized in that at 100 vektdeler sement innblandes 60 - 70 vektdeler tre, og denne blanding ferdiggjores med så meget av en vannopplbsning av aceton-formaldehydharpiks med et faststoffinnhold på 40 - 60 vekt-% at på 100 vektdeler sement foreligger 10 - 100 vektdeler beregnet som tørr harpiks, hvoretter blandingen støpes i e.i stopeform og herdes ved temperaturer mellom 30 og 200°C og ved et trykk mellom atmosfæretrykk og 150 kp/cm .parts by weight of cement, 60 - 70 parts by weight of wood are mixed in, and this mixture is finished with so much of a water solution of acetone-formaldehyde resin with a solids content of 40 - 60% by weight that for 100 parts by weight of cement there are 10 - 100 parts by weight calculated as dry resin, after which the mixture is cast in e.i stope form and hardened at temperatures between 30 and 200°C and at a pressure between atmospheric pressure and 150 kp/cm. 2. Fremgangsmåte ifolge krav 1, karakterisert ved at aceton-formaldehydharpiksen er en ved 20 - 100°C alkalisk kondensert harpiks med et molforhold mellom aceton og formaldehyd på 1:1,5-5. 2. Method according to claim 1, characterized in that the acetone-formaldehyde resin is a 20 - 100°C alkaline condensed resin with a molar ratio between acetone and formaldehyde of 1:1.5-5. 3. Fremgangsmåte ifolge et av kravene 1 og 2, karakterisert ved at herdningen foregår ved 90 - 100°C og atmosfæretrykk. 3. Method according to one of claims 1 and 2, characterized in that the curing takes place at 90 - 100°C and atmospheric pressure. 4. Fremgangsmåte ifolge et av kravene 1 eller 2, karakterisert ved at herdningen foregår ved 145°C og 22 kp/cm<2.>4. Method according to one of claims 1 or 2, characterized in that the curing takes place at 145°C and 22 kp/cm<2.>
NO743437A 1973-10-25 1974-09-24 PROCEDURE FOR THE PREPARATION OF BENEFITS OF CEMENT BY MIXING CEMENT WITH FORMALDEHYDE RESIN AND WOOD IN FINE DISTRIBUTED FORM NO138801C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19732353490 DE2353490C3 (en) 1973-10-25 Process for the production of thermoset molded parts from cement
DE19732353474 DE2353474C3 (en) 1973-10-25 Process for the production of thermoset molded parts from cement

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NO743437L NO743437L (en) 1975-05-20
NO138801B true NO138801B (en) 1978-08-07
NO138801C NO138801C (en) 1978-11-15

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JP (1) JPS5074624A (en)
CH (1) CH602509A5 (en)
DD (1) DD114390A5 (en)
DK (1) DK557674A (en)
FI (1) FI288374A (en)
FR (1) FR2249047B3 (en)
GB (1) GB1438745A (en)
HU (1) HU170801B (en)
NL (1) NL7413878A (en)
NO (1) NO138801C (en)
SE (1) SE395683B (en)
YU (1) YU244674A (en)

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DE3315152A1 (en) * 1983-04-27 1984-11-08 Skw Trostberg Ag, 8223 Trostberg CO-CONDENSATION PRODUCTS OF KETONE ALDEHYDE RESINS

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FR2249047A1 (en) 1975-05-23
DK557674A (en) 1975-06-16
FI288374A (en) 1975-04-26
SE7412954L (en) 1975-04-28
CH602509A5 (en) 1978-07-31
GB1438745A (en) 1976-06-09
NL7413878A (en) 1975-04-29
YU244674A (en) 1982-06-18
NO138801C (en) 1978-11-15
SE395683B (en) 1977-08-22
DD114390A5 (en) 1975-08-05
HU170801B (en) 1977-09-28
FR2249047B3 (en) 1977-07-22
JPS5074624A (en) 1975-06-19
NO743437L (en) 1975-05-20

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