Size composition, comprising organic ester compounds and particulate, amorphous silicon dioxide, for use in the foundry industry
A technology of amorphous silica and organic compounds, used in casting mouldings coated with coatings, the field of amorphous silica
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example 1
[0178] Example 1: Manufacture of coating composition.
[0179] The paint compositions according to the invention ("SZ1", "SZ2") and the comparative paint compositions not according to the invention ("SZ3" or "SZ4") given in Table 1 are given in a manner known per se by corresponding The ingredients are mixed with each other to manufacture.
[0180] For this purpose, the required amount of water is stored in each beaker (batch size in each case approx. 2 kg of paint composition as "concentrate", see Table 1), rheology modifier and refractory material (phyllosilicate, zirconium powder, graphite) and then comminuted in a manner known per se by means of a high-shear dissolving mixer for 3 minutes. Subsequently, the other components of the coating composition (see Table 1) were added in the quantity ratios indicated and stirred for a further 2 minutes by means of a high-shear dissolution stirrer. Dilutable concentrates of the paint compositions given in Table 1 were obtained in e...
example 2
[0193] Example 2: Investigating the softening of the casting core
[0194] In order to determine the softening of the casting core (i.e. the maximum drop in bending strength) in a manner known per se in a core shooter company from Multiserw (type LUT, gas treatment pressure: 2 bar, shot time: 3.0 seconds; shot pressure: 4.0 bar) Test cores (specimen; according to "Core System 1" given in Table 4) were produced. One hour after the manufacture of the cores, the test cores were coated with the above-mentioned ready-to-use coating compositions "SZ1", "SZ3" or "SZ4" (see Table 1a) by dipping at room temperature (25°C) (conditions: immersion for 1 s; 3s hold time in paint composition, 1s pull out) cladding (coating). The wet layer thickness of the paint is here set to approximately 250 μm in each case. Subsequently, the coated test cores were dried in a ventilated oven under the conditions given below (1 hour at 120° C.) and their change in bending strength under dry conditions w...
example 3
[0201] Example 3: Test of storage stability of coated and uncoated casting cores
[0202] In order to determine the storage stability, water glass-bonded test cores (specimen) were produced in a manner known per se and their flexural strength was respectively uncoated shortly after its production (storage time of one hour, relative air humidity at % in the range of 30 to 60%, the storage temperature in the range of 20° C. to 25° C.) was determined as explained above, see Table 3 (entry “Uncoated after 1 h”).
[0203] Furthermore, the corresponding test cores were composed of SZ1 or SZ4 with coatings at room temperature (25° C.) as given below in Table 3 one hour after core manufacture (i.e. in respectively the same time interval from its manufacture) Each was applied by dipping (conditions: 1 s immersion; 3 s hold time in the paint composition, 1 s pull-out) (the paint composition was named as in Example 1) and subsequently dried in each case in a ventilated oven at 120° C. ...
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