DE1934371C - Liquid, self-solidifying molding compound for casting cores and molds - Google Patents

Claims (1)

i 934371 1 2 The invention is made of liquid, sluice-like liquid and is the first step in the gas-tight wedge of the finished device. Masscn for the production of casting molds and molds, certificates bol. . . According to a known ancestor for making uoispiei Self-solidifying masses are filled with quartz. sand, water glass as a binding agent, a foaming agent 5 _QlmmHm , ₉₅ " OewlülUstello as well as, if necessary, to cun.gung the Urstar. _{Nutmnwnssorglus (WidUc} , ₄₈ rcns the mass of diclium silicate and a urea module 2 7) 6 0 parts by weight Formaldehyde-rurfurol resin used (cf. franzö- DiK'rmsilLt'in ^ onnVonbe'i ' sian patent specification I 342 529 and British patent _{t (cr} Forrochromorzeimuim an- Schrifl I085 65I) The resulting liquid masses io _raUcndor gopulvorlor gulps 6.0 parts by weight guarantee, however - despite the large technological waste lHtoslukolt from the furan Vortcile, like easily filling the core box with lli.s- | _ul rzgewin.u.ng 0.6 parts by weight s.ger mass before it is not compacted and before the alkyluFylsulfoiiuUSchnumWIdner 0 1 part by weight Air solidifies automatically, and use of cheap water 1 5 to 2 0 Giiwiehisteile Hardener - not sufficiently gentle tapping of the 15 '' ütwiLlUMult, Cores from the castings, especially from cast iron, instead of soda waterglass can also be used Potash water glass kcn of complex shape. Also, the wise to be applied. solidified masses after an hour only one pressure- The dry components (quartz sand and the pul- strength of 1.5 to 2 kp / cm- which is used for storage, fermented slag) are in the mortar mixer at 30 Conveying and assembling the cores not mixed for 20 to 60 rpm in the course of 1 to 2 minutes, is always sufficient. In a number of cases, the liquid components (water glass, those involved in making the cores of complicated foaming agents, water and waste liquid), which in stall and with protruding parts the latter were mixed with a special vessel in the subsequent assembly splintered from the core. Mortar mixer introduced, whereupon you put the mass In addition, the solidification time of the generated as is in the course of 2 to 3 minutes, i.e. H. until they Masses very large (40 to 50 minutes), which makes the liquid thin and gaze-like, mixed. Casting process is prolonged so that the decay die reached such a liquid state not suitable for industrial mass production - molding compound can now cinge in the core boxes. is reversible. poured or poured onto the models. The 30 on which the present invention is based to solidify the cores and casting molds is not The task is to eliminate the enumerated tub drying required; rather, they can soon Disadvantages due to the development of a self-solidifying after its production with metal poured or poured liquid mass, which has a high solidification rate and thus for the production of castings digkcit and a high strength of the solidified mass are related to steel, cast iron and non-ferrous alloys as well as a slight knocking out of the cores from the 35. Castings guaranteed. The foaming agents can be used in quantities of This task is solved by a liquid, one-half or one-tenth of the percent of the molding compound self-solidifying mass on the basis of quartz weight can be introduced, whereby the some mi sand as a filler, water glass as a binder, thinly mixed mass from the little deformed calcium silicate or the latter containing tunnels passes into the liquid state as 40 bars. Both the additive ensuring the solidification of the mass, anionic foaming agents, the desired toughness surface-active anionic or non-ionogenic properties and resistance of the foam due to alkylaryl Substances as foaming agents and other additives sulfonate, alkyl sulfonate and alkyl sulfate, which by and water, which according to the invention by the whitening or sulfating of the refined products tere addition of those used in the production of furan resin 45 from petroleum and oil shale or on synthetic resulting aqueous liquid, which are obtained from the Re-way, guaranteed. As not- action water and the wash water, genetic foaming agents are mainly the is marked. due to the addition of ethylene oxide to active water Organic compounds containing 0.1 to 1.0 are expediently produced 0.3 to 1.0 parts by weight of the waste liquid are used for 50 ten substances. But foam can also be used. This contains 10 to 15% of active substances from the group of oxyethylated alkylphenols, Furfural alcohol, methanol and formaldehyde and sterile alcohols, fatty acids, aliphatic amines, alkyl devices Significant the binding capacity of the water glass. naphthols and mercaptans are used. By adding the waste liquid to the molding compound ...
a 1.5 to 2-fold increase in strength of the 55 claims:
Compared to the strength of the conventional 1. Liquid, self-solidifying molding compound for liquid compounds; the compressive strength of the casting cores and molds on the basis of search pieces is 5 to sand, water glass, dicalcium silicate or the latter 6 kp / cm ² after one hour. In addition, the solidification process of the substances contained, anionic or non-mass, is accelerated by 1.5 to 2 times and the inogenic foaming agents and other additives, knocking out the cores by 20 to 30% are facilitated. and water, characterized Compared to the use mentioned at the beginning that they are used as a further addition in the production a urea form modified with furfural of furan resin resulting aqueous liquid, the Aldehyde resin is brought about by the addition according to the invention from the water of reaction and the wash water the waste liquid does not only contain an acceleration 65. of the hardening process, but also an increase 2. Mass according to claim 1, characterized in that The shelf life of the liquid molding compound and the fact that it is 0.3 to 1.0 parts by weight of the Foam resistance as well as contributes to faster how- contains waste liquid.