A kind of high permeability and high fire resistance coated sand and preparation method thereof
A technology of air permeability and fire resistance, applied in the field of casting, can solve the problems affecting the quality of castings, high temperature resistance and air permeability, etc., and achieve the effect of high fire resistance, high air permeability and wide source of raw materials
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[0020] The preparation method of the high air permeability and high refractoriness coated sand of the present invention is implemented according to the following steps:
[0021] Step 1. Weigh the raw materials
[0022] Weigh the following raw materials according to mass percentage: zircon raw sand 92.75% to 99.25%; (binder) urea-formaldehyde furan resin 0.5% to 5%; curing agent 0.025% to 0.5%; (lubricant) zinc stearate or Calcium stearate 0.025%-0.25%; iron oxide 0.1-0.5%; polyurethane foam micro-beads, polystyrene micro-beads or polymethyl methacrylate micro-beads 0.1%-1%, total 100%.
[0023] Step 2. Prepare coated sand with high air permeability and high refractoriness
[0024] 2.1) Heat the raw zircon sand to 100-180°C, add zinc stearate or calcium stearate and stir evenly to obtain mixture A;
[0025] 2.2) Add the urea-formaldehyde furan resin to the mixture A obtained in step 2.1) and continue to stir evenly for 20 to 40 minutes to obtain the mixture B;
[0026] 2.3) ...
Embodiment 1
[0031] Step 1, take raw materials, weigh the following raw materials respectively according to mass percentage:
[0032] Zircon raw sand 92.75%; binder urea-formaldehyde furan resin 5%; curing agent 0.5%; lubricant zinc stearate 0.25%; iron oxide 0.5%; polyurethane foam microbeads 1%, total 100%.
[0033] The particle size of zircon raw sand is 50 mesh; the particle size of polyurethane foam microbeads is 0.05mm.
[0034] Step 2. Prepare coated sand with high air permeability and high refractoriness
[0035] 2.1) Heat the raw zircon sand to 100°C, add zinc stearate lubricant and stir evenly to obtain mixture A;
[0036] 2.2) Add the urea-formaldehyde furan resin binder to the mixture A obtained in step 2.1) and continue to stir evenly for 20 minutes to obtain the mixture B;
[0037] 2.3) Cool the mixture B to 80°C, add the curing agent and iron oxide into the mixture B obtained in step 2.2) and continue to stir evenly for 15 minutes to obtain the mixture C;
[0038] 2.4) Co...
Embodiment 2
[0042] Step 1, take raw materials, weigh the following raw materials respectively according to mass percentage:
[0043] Zircon raw sand 95.8%; binder urea-formaldehyde furan resin 3%; curing agent 0.25%; lubricant calcium stearate 0.15%; iron oxide 0.2%; polystyrene microbeads 0.6%, total 100%.
[0044] The particle size of zircon raw sand is 100 mesh; the particle size of polystyrene beads is 0.3mm.
[0045] Step 2. Prepare coated sand with high air permeability and high refractoriness
[0046] 2.1) Heat the raw zircon sand to 150°C, add calcium stearate lubricant and stir evenly to obtain mixture A;
[0047] 2.2) Add the urea-formaldehyde furan resin binder to the mixture A obtained in step 2.1) and continue to stir evenly for 30 minutes to obtain the mixture B;
[0048] 2.3) Cool the mixture B to 100°C, add the curing agent and iron oxide into the mixture B obtained in step 2.2) and continue to stir evenly for 25 minutes to obtain the mixture C;
[0049] 2.4) Cool, crus...
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