PL131777B1 - Moulding and core sand - Google Patents

Moulding and core sand Download PDF

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Publication number
PL131777B1
PL131777B1 PL23597882A PL23597882A PL131777B1 PL 131777 B1 PL131777 B1 PL 131777B1 PL 23597882 A PL23597882 A PL 23597882A PL 23597882 A PL23597882 A PL 23597882A PL 131777 B1 PL131777 B1 PL 131777B1
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PL
Poland
Prior art keywords
weight
parts
minutes
furfuryl
acid
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PL23597882A
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Polish (pl)
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PL235978A1 (en
Inventor
Grzegorz Derecki
Maciej Aslanowicz
Krzysztof Domagalo
Krystyna Sabok
Jerzy Szymanski
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Inst Chemii Przemyslowej
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Priority to PL23597882A priority Critical patent/PL131777B1/en
Publication of PL235978A1 publication Critical patent/PL235978A1/en
Publication of PL131777B1 publication Critical patent/PL131777B1/en

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Description

Przedmiotem wynalazku jest furanowa raasa forniereka i rdzeniowa, stosowana przy wytwa¬ rzaniu fora i rdzeni odlewniozyoh* Znana sa raasy forraiarskia i rdzeniowa zawierajaca jako spoiwo zywioa furfurylowo-mooz- nikowo-foraaldehydowe utwardzona substanojami o charakterze kwasnym, najozesoiej kwasem o-fosforowym* Opis patentowy polski nr 79 069 podaje przyklad takiej raasy formierskiej zawierajacej jako spoiwo zywiec furfurylowo-mooznikowo-formaldehydowa otrzymana w wyniku trójetapowoj kondensaeji formaliny 1 mocznika w srodowisku alkalicznym, kwasnym i ponownie kwasnym, a nastepnie modyfikaojl monomeryoznym alkoholem furfurylowym w ilosci 0,1 - 2,0 moli na mol mocznika. Ilosc zywicy wynosi 1-5 csesoi wagowych na 100 ozesoi wagowych piasku kwar¬ cowego, utwardzaoza kwasowego okolo 50 % wagowyoh w stosunku do zywicy* Masy formierskie tego rodzaju pozwalaja na prawidlowe przeprowadzenie procesu formowa¬ nia, wymagaja jednak stosunkowo dlugiego ozasu utwardzania, zarówno do momentu rozbierania formy, jak i do calkowitego utwardzenia* Przyspieszanie utwardzania na drodze zwiekszania ilosci utwardzacza wywoluje niedopuszczalny spadek wlasciwosci meohanloznych masy* Czesto obserwuje sie równiez zjawisko wiazania skorupowego* Zbyt dlugi czas wstepnego wiazania, siegajacy 60 - 100 minut, stanowi glówna przeszko¬ de w zastosowaniu tego rodzaju mas w zmechanizowanych prooesaoh o duzej wydajnosci formo¬ wania* Wymagaja one wstepnego zwiazania masy w okresie 15-30 minut od zaformowania* Celem niniejszego wynalazku Jest uniknieoie powyzszego mankamentu poprzez odpowiedni dobór skladników masy* Okazalo sie, iz wymagany ozas wstepnego wiazania mozna uzyskac stosujao jako spoiwo zywloe furfurylowoM&oeznlkowo-formaldehydowa odwodniona w prooesie azaotropowym z obojet¬ nym rozpuszczalnikiem organicznym do zawartosci wody ponizej 5£ wagowyoh. Masa formierska2 131 777 i rdzeniowa zawierajaca 1 - 5 % wagowyoh takioj zywicy wiaza bardzo szybko, pozwalajae na rozbieranie form po uplywie 15 - 25 minut* Szczególna zaleta mas wedlug wynalazku jest mozliwosc calkowitego zakonczenia prooeau utwardzania w ciagu 3-4 godzin* Przy zastoso¬ waniu typowych utwardzaozy Jak kwas o-foeforc*y i/lub kwas p-toluenosulfonowy w ilosoi okolo 50 % wagowyoh w stosunku do zywicy, masa formierska nie wymaga dodatkowego podgrze¬ wania piasku. Nawet przy stosunkowo niskich temperaturach otoczenia nie wystepuje zjawisko wiazania skorupowego.Przyklad I* Do 100 czesci wagowych piasku kwaroowego o temperaturze 20°C do¬ daje sie 0,6 czesoi wagowej utwardzacza o skladzie: 50 % wagowych kwasu p-toluenosulfono- wego, 10 % wagowy oh kwasu o-fosforowego, 40 % etanolu, po ozym skladniki miesza sie w oia- gu 2 minut* Nastepnie dodaje sie 1,2 czesci wagowej zywicy fiurfiirylowo-mooznikowo-formnl- dehydowej odwodnionej w prooesie azeotropowym z toluenem do zawartosci wody 2,5 % wagowe¬ go* Calosc miesza sie ponownie 2 minuty. Czas wstepnego wiazania masy wynosi 22 minuty* Masa osiaga po uplywie 4 godzin wytrzymalosc na rozrywanie 1,5 MPa* Przyklad II* Do 100 czesoi wagowych plasku kwaroowego o temperaturze 18°C dodaje sie 2 czesci wagowe utwardzacza - kwasu o-fosforowego o stezeniu 75 % wagowych.Skladniki miesza sie przez 2 minuty* Nastepnie dodaje sie 4 ozesoi wagowe zywicy furfury- lowoHBOOznikowo-formaldehydowej, w której zawartosc wody obnizono poprzez odwodnienie azeotropowe do 4 % wagowych i ponownie miesza calosc przez 2 minuty* Czas wstepnego wia¬ zania masy wynosi 25 minut* Masa osiaga po uplywie 4 godzin wytrzymalosc na rozrywa^ nie 2,0 MPa.Przyklad III* Do 100 czesoi wagowych piasku kwaroowego o temperaturze 20°C dodaje sie 1,2 ozesoi wagowej utwardzacza o skladzie: 45 % wagowych kwasu p-toluenosul- fonowego, 45 % wagowych kwasu o-fosforowego, 10 % wagowyoh etanolu, po ozym skladniki miesza sie w oiagu 2 minut* Nastepnie dodaje sie 2,0 czesoi wagowe zywioy furfuryIow0- -mooznikowo-formaldehydowej odwodnionej w prooesie azeotropowym z toluenem do zawartosoi wody 3f5 % wagowego* Calosc miesza sie ponownie 2 minuty. Czas wstepnego wiazania masy wynosi 15 minut* Hasa osiaga po uplywie 4 godzin wytrzymalosc na rozrywanie 1,5 MPa.Przyklad IV* Do 100 ozesoi wagonyoh piasku kwarcowego o temperaturze 22°C dodaje sie 2,0 ozesoi wagowe 60 % kwasu p-toluenosulfonowego i miesza przez 2 minuty.Nastepnie dodaje sie 2,0 ozesoi wagowe zywicy furfurylowo-mooznikowo-formaldehydowej odwodnionej azeotropowo do zawartosci wody 4,5 % wagowego* Ponownie miesza sie skladni¬ ki masy przez 2 minuty* Czas wstepnego wiazania masy wynosi 14 minut* Masa osiaga po uplywie 4 godzin wytrzymalosc na rozrywanie 1,0 MPa* Zastrzezenie patentowe Masa formierska i rdzeniowa zawierajaoa 1-5 ozesoi wagowych zywicy furfurylowo- -mooznikowo-formaldehydowej oraz 0,2 - 5 czesoi wagowyoh utwardzacza kwasowego na 100 ozesoi wagowyoh piasku kwaroowego, znamienna tym, ze w sklad jej wchodzi zywioa furfurylowo-moorcnikowo-formaldehydowa odwodniona azeotropowo do zawartosci wody ponizej 5 % wagowyoh* Pracownia Poligraficzna UP PRL. Naklad 100 egz.Cena 100 zl PLThe subject of the invention is furan veneer and core species, used in the production of forums and foundry cores. There are known forage and core species containing as a binder furfuryl-monocarbon-formaldehyde resins hardened with acidic substances, most of them with phosphoric acid * Polish No. 79 069 gives an example of such a molding breed containing as a binder furfuryl-monomeric-formaldehyde resin obtained as a result of a three-stage condensation of formalin and urea in an alkaline, acid and again acid environment, and then modified with monomeric furfuryl alcohol 0.1 - 2.0 in the amount moles per mole of urea. The amount of resin is 1-5 parts by weight per 100 weight steps of quartz sand, acid hardening is about 50% by weight in relation to the resin. Molding compounds of this type allow for a proper molding process, but require a relatively long time of hardening, both for the moment of disassembling the mold and until it is completely cured * Accelerating the hardening by increasing the amount of hardener causes an unacceptable decrease in the mechanical properties of the mass * The phenomenon of crust binding is also often observed * Too long initial setting time, reaching 60 - 100 minutes, is the main thing the use of this type of mass in mechanized processes with high forming capacity * They require initial setting of the mass within 15-30 minutes from forming * The purpose of the present invention is to avoid the above drawback by appropriate selection of the mass components * It turned out that the required initial setting can be get the stack as a binder of furfuryl-formaldehyde resin dehydrated in an azotropic process with an inert organic solvent to a water content of less than 5 wt. Molding sand2 131 777 and core containing 1 - 5% by weight of such resin binds very quickly, allowing the molds to be disassembled after 15 - 25 minutes * A special advantage of the sand according to the invention is the possibility of complete hardening process within 3-4 hours * When applied In the case of conventional curing agents, such as o-foeforcic acid and / or p-toluenesulfonic acid in an amount of about 50% by weight, based on the resin, the molding sand does not require additional heating of the sand. Even at relatively low temperatures, the phenomenon of crust binding does not occur. Example I * To 100 parts by weight of quartz sand at 20 ° C, 0.6 parts by weight of a hardener composed of: 50% by weight of p-toluenesulfonic acid, 10 % by weight o-phosphoric acid, 40% ethanol, then the components are mixed for 2 minutes * Then 1.2 parts by weight of fifurryryl-monosaccharide-formnl-dehydrate resin dehydrated in azeotropic treatment with toluene are added to the water content 2 5% by weight. The whole is mixed again for 2 minutes. The initial setting time is 22 minutes * The mass reaches after 4 hours the tearing strength 1.5 MPa * Example II * To 100 parts by weight of quartz sand at a temperature of 18 ° C 2 parts by weight of the hardener - phosphoric acid with a concentration of 75 % by weight. The ingredients are mixed for 2 minutes * Then 4 parts by weight of furfuryl-HBOO-formaldehyde resin, the water content of which has been reduced by azeotropic dehydration to 4% by weight, are added and mixed again for 2 minutes * The initial setting time of the mass is 25 minutes * The mass reaches after 4 hours the tearing strength of 2.0 MPa. Example III * To 100 parts by weight of quartz sand at 20 ° C, 1.2 parts by weight of hardener composed of: 45% by weight of p- acid are added toluenesulfonic acid, 45% by weight o-phosphoric acid, 10% by weight of ethanol, after which the ingredients are mixed for 2 minutes * Then 2.0 parts by weight of furfury-mineral-formaldehyde feed are added dehydrated in azeotropic treatment with toluene to a water content of 3 to 5% by weight * The whole is mixed again for 2 minutes. The time of initial setting of the mass is 15 minutes * Hasa reaches the tearing strength of 1.5 MPa after 4 hours. Example IV * To 100 parts by weight of quartz sand at 22 ° C, 2.0 parts by weight of 60% p-toluenesulfonic acid are added and Mix for 2 minutes, then add 2.0 parts by weight of azeotropically dehydrated furfuryl-monomic-formaldehyde resin to a water content of 4.5% by weight * The ingredients are mixed again for 2 minutes * The initial setting time is 14 minutes * Weight reaches after 4 hours tear strength 1.0 MPa * Patent claim Molding and core mass consist of 1-5 weight parts of furfuryl-low-formaldehyde resin and 0.2 - 5 parts by weight of acid hardener per 100 parts by weight of quartz sand, characterized by because it consists of furfuryl-motocic-formaldehyde element, azeotropically dehydrated to a water content below 5% by weight * Pracownia Poligraficzna UP PRL. Mintage 100 copies Price PLN 100 PL

Claims (2)

Zastrzezenie patentowe Masa formierska i rdzeniowa zawierajaoa 1. -5 ozesoi wagowych zywicy furfurylowo- -mooznikowo-formaldehydowej oraz 0,Patent claim The molding and core mass contains 1-5 weight levels of furfuryl-low-formaldehyde resin and 0, 2. - 5 czesoi wagowyoh utwardzacza kwasowego na 100 ozesoi wagowyoh piasku kwaroowego, znamienna tym, ze w sklad jej wchodzi zywioa furfurylowo-moorcnikowo-formaldehydowa odwodniona azeotropowo do zawartosci wody ponizej 5 % wagowyoh* Pracownia Poligraficzna UP PRL. Naklad 100 egz. Cena 100 zl PL2.- 5 parts by weight of acid hardener per 100 parts by weight of quartz sand, characterized by the fact that it consists of furfuryl-moorite-formaldehyde azeotropically dehydrated to a water content of less than 5% by weight * Pracownia Poligraficzna UP PRL. Mintage 100 copies. Price PLN 100 PL
PL23597882A 1982-04-15 1982-04-15 Moulding and core sand PL131777B1 (en)

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PL23597882A PL131777B1 (en) 1982-04-15 1982-04-15 Moulding and core sand

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Application Number Priority Date Filing Date Title
PL23597882A PL131777B1 (en) 1982-04-15 1982-04-15 Moulding and core sand

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PL235978A1 PL235978A1 (en) 1983-10-24
PL131777B1 true PL131777B1 (en) 1985-01-31

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