Method for making metal castings or hardened moldings using aliphatic polymers containing hydroxyl groups
A moulded part, aliphatic technology, used in the field of moulded parts for cast metal castings, moulding material mixtures, adhesives for moulded parts, able to solve the problems of low moisture resistance, limited storage capacity, poor insulation properties, etc.
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example 1
[0303] Example 1: Manufacture of a moulding material mixture
[0304] Mixtures of molding materials were made using the components specified in Table 1 below.
[0305] Table 1: Components of the molding material mixture
[0306]
[0307] Silica sand BO 42 (CAS number 014808-60-7) from Bodensteiner Sandwerk GmbH & Co. KG, respectively, was used as molding raw material.
[0308] A 25 wt% solution of polyvinyl alcohol (>93% polyvinyl alcohol) from Kuraray was used as the aqueous PVAL mixture with a degree of hydrolysis of about 88 mol% and a dynamic viscosity in the range of 3.5 mPa·s to 4.5 mPa·s (at 20 Measured according to DIN 53015 at °C using a 4% by weight aqueous solution), methanol content <3% by weight; CAS RN 25213-24-5.
[0309] A 36.5% by weight aqueous sulfuric acid solution (CAS RN 7664-93-9) was used as the aqueous sulfuric acid mixture.
[0310] A common polyisocyanate (activator 6324 from Hüttenes-Albertus Chemische Werke GmbH) used for the manufacture of c...
example 2
[0317] Example 2: Generation of Standard Bend Test Bars
[0318] The moulding material mixture described in Example 1 in a manner known to those skilled in the art was produced by means of hammering according to Verein Deutscher Gieβereifachleute Regulation P73 (issued February 1996, Issue 4.1) (hereinafter referred to as "VDG Regulation P73"). ”) to manufacture standard bending test bars for testing purposes (representing hardened mouldings for cast metal castings, dimensions: 172 x 23 x 23 mm).
[0319] To harden the bending test bars, respectively, proceed as described below:
[0320] Bend Test Bar B - Cold Box: A moulding material mixture cold box (see Example 1 ) was shaped as described above by means of hammering in a Bend Bar Hammering Core Box. The shaped mouldings were subsequently hardened by means of the cold box method by means of the method in VDG regulation P73, stage 4.3 (method A) by means of passage through gaseous (under process conditions) N,N-dimethylpropy...
example 3
[0323] Example 3: Strength Determination of Standard Bend Test Bars
[0324] The final strength of the standard bending test bars produced in Example 2 above was individually tested: For this purpose, the final strength of the standard bending test bars B-Cold Box was tested 24 hours after manufacture. For this purpose, standard bending test bars B-V38, B-E613V1 and B-68.4 were tested for their final strength 30 minutes after manufacture (drying). All standard bend test bars are stored under laboratory conditions. The final strength was determined in triplicate using a Georg Fischer strength testing device type PFG with low pressure pressure calculation (using a motor drive), respectively, as described in VDG regulation P73 issue 5.2.
[0325] Determine the flexural strength of the standard flexural test bars described in Table 2 in this manner:
[0326] Table 2: Final Strength of Standard Bend Test Bars
[0327]
[0328] n.d.: Value not determined.
[0329] As can be s...
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