CN104841847A - High temperature resistant molding sand with good mold release property and preparation method thereof - Google Patents
High temperature resistant molding sand with good mold release property and preparation method thereof Download PDFInfo
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- CN104841847A CN104841847A CN201510199804.3A CN201510199804A CN104841847A CN 104841847 A CN104841847 A CN 104841847A CN 201510199804 A CN201510199804 A CN 201510199804A CN 104841847 A CN104841847 A CN 104841847A
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Abstract
The invention relates to a high temperature resistant molding sand with good mold release property. The molding sand is prepared from the following raw materials by weight part: 30-40 of magnesia, 2-3 of polyethylene glycol, 1-1.3 of sodium carboxymethyl cellulose, 2-3 of sulfurized olefin cottonseed oil, 10-14 of electrolytic manganese residue, 15-20 of kaolin, 8-12 of strontium aluminate, 2-3 of glycerophosphate, 5-6 of polyurethane resin, 200-220 of clay, a proper amount of water, and 20-30 of an assistant. The molding sand provided by the invention uses strontium aluminate and magnesia, and increases the heat resistance. By using clay, the molding sand has suitable particle size, has good air permeability, good fluidity and good dispersivity, also the casting surface is smooth, and the molding sand can be recycled. Without employing coal dust, the molding sand has little pollution, small gas generation amount, short drying time and high dry-tensile strength. Also the mold release property of the molding sand is improved, and the smoothness and fineness of the casting can be further improved.
Description
Technical field
The present invention relates to casting field, particularly relate to good high temperature resistant molding sand of a kind of release property and preparation method thereof.
Background technology
The subject matter that current molding sand exists has: 1, particle size difficulty controls, if molding sand particle diameter is too large, although gas permeability is better, cast(ing) surface is more coarse, and fineness is bad; If molding sand material footpath is too little, cause mo ld void bad, foundry goods has pore to produce.2, dispel the heat bad, chill effect is poor, and shrinkage porosite, shrinkage cavity phenomenon easily appear in intricate casting inside.3, dispersed, mobility is bad, easily caking, dusting beans.4, easily foundry goods is stain.5, release property is poor.6, molding sand is targetedly lacked for different types of alloy.
Conventional clay molding sand has many good qualities, but exists not easy to be recycled, and poor air permeability, mobility are bad, dispersiveness is bad, collapsibility is poor, it is bad to dispel the heat, environmental pollution is serious shortcoming.
Therefore, the above shortcoming that molding sand exists needs to overcome.
Summary of the invention
The object of the present invention is to provide good high temperature resistant molding sand of a kind of release property and preparation method thereof, this molding sand adds the heat-resisting quantity of molding sand, good permeability, good fluidity, good dispersion, pollute few, gas forming amount is little, drying time is short, baked tensile strength is high, and the release property of sand mold can be improved, foundry goods can be made to improve fineness further.
Technical scheme of the present invention is as follows:
The good high temperature resistant molding sand of a kind of release property, is characterized in that being made up of the raw material of following weight portion: magnesia 30-40, polyethylene glycol 2-3, sodium carboxymethylcellulose 1-1.3, sulfurized olefin cotton oil 2-3, electrolytic manganese residues 10-14, kaolin 15-20, strontium aluminate 8-12, glycerophosphate 2-3, polyurethane resin 5-6, clay 200-220, water are appropriate, auxiliary agent 20-30;
Described auxiliary agent is made up of the raw material of following weight portion: useless porcelain 18-22, cullet 2-3, sodium carbonate 2-3, bentonite 3-4, carboxymethyl cellulose 0.5-1, clay 3-4, calgon 1-1.4, PP wax 1-1.4, dextrin 1-1.4, water are appropriate; Preparation method is: carry out ball milling by after useless porcelain, cullet, sodium carbonate, bentonite mixing, cross 200 mesh sieves, calcine 5-6 hour, be ground into the particle that particle diameter is less than 2mm at 1200-1220 DEG C; Add in 4-5 weight parts water by clay, carboxymethyl cellulose, dextrin, add described particle, stir after stirring, dry, pulverize, particle diameter at 0.05-2mm, then mixes with other residual components, stirs, to obtain final product.
The preparation method of described release property is good high temperature resistant molding sand, is characterized in that comprising the following steps:
(1) by clay, electrolytic manganese residues, kaolin, strontium aluminate mixing, pulverize, cross 50 mesh sieves, the water adding 7-9% weight portion stirs, granulation, particle diameter, at 0.05-2.5mm, is sent in calcining furnace, pre-burning 20-25 minute at 300-400 DEG C, then sinter at 1230-1270 DEG C, take out, polish to surface roughness≤0.1mm, obtain clay particle;
(2) by polyethylene glycol, sodium carboxymethylcellulose, sulfurized olefin cotton oil, glycerophosphate, polyurethane resin, magnesia mixing, grinding 10-15 minute, obtains mixed material;
(3) material that described clay particle, (2) step obtain is mixed with other residual components, then add the water mixing 7-10 minute of 3.9-4.7% weight portion, to obtain final product.
Beneficial effect of the present invention
Molding sand of the present invention employs strontium aluminate, magnesia, adds the heat-resisting quantity of molding sand; By using clay, particle size is suitable, not only good permeability, good fluidity, good dispersion, and cast(ing) surface is smooth, all right recycling; This molding sand does not adopt coal dust, and pollute few, gas forming amount is little, drying time is short, baked tensile strength is high, and can improve the release property of sand mold, and foundry goods can be made to improve fineness further.Auxiliary agent of the present invention employs useless porcelain, cullet, good heat resistance, and Surface coating has clay, has good compatibility with clay particle, can increase mobility, the dispersiveness of molding sand simultaneously, prevent from boning during clay particle high temperature, be beneficial to recycling.
Detailed description of the invention
The good high temperature resistant molding sand of a kind of release property, is made up of the raw material of following weight portion (kilogram): magnesia 35, polyethylene glycol 2.5, sodium carboxymethylcellulose 1.1, sulfurized olefin cotton oil 2.5, electrolytic manganese residues 13, kaolin 17, strontium aluminate 11, glycerophosphate 2.5, polyurethane resin 5.5, clay 210, water are appropriate, auxiliary agent 25;
Described auxiliary agent is made up of the raw material of following weight portion (kilogram): useless porcelain 20, cullet 2.5, sodium carbonate 2.5, bentonite 3.5, carboxymethyl cellulose 0.7, clay 3.5, calgon 1.2, PP wax 1.2, dextrin 1.2, water are appropriate; Preparation method is: carry out ball milling by after useless porcelain, cullet, sodium carbonate, bentonite mixing, cross 200 mesh sieves, calcine 5.5 hours, be ground into the particle that particle diameter is less than 2mm at 1210 DEG C; Add in 4.5 weight parts waters by clay, carboxymethyl cellulose, dextrin, add described particle, stir after stirring, dry, pulverize, particle diameter at 0.05-2mm, then mixes with other residual components, stirs, to obtain final product.
The preparation method of described release property is good high temperature resistant molding sand, comprises the following steps:
(1) by clay, electrolytic manganese residues, kaolin, strontium aluminate mixing, pulverize, cross 50 mesh sieves, the water adding 8% weight portion stirs, granulation, particle diameter, at 0.05-2.5mm, is sent in calcining furnace, pre-burning 23 minutes at 350 DEG C, then sinter at 1250 DEG C, take out, polish to surface roughness≤0.1mm, obtain clay particle;
(2) by polyethylene glycol, sodium carboxymethylcellulose, sulfurized olefin cotton oil, glycerophosphate, polyurethane resin, magnesia mixing, grind 13 minutes, obtain mixed material;
(3) material that described clay particle, (2) step obtain is mixed with other residual components, then the water adding 4.5% weight portion mixes 8 minutes, to obtain final product.
The sand test data that the present embodiment obtains are as follows: green compression strength is 89KPa, gas permeability 92, and hot green tensile strength is 2.1KPa, and normal temperature green tensile strength is 25KPa.
Claims (2)
1. the good high temperature resistant molding sand of release property, is characterized in that being made up of the raw material of following weight portion: magnesia 30-40, polyethylene glycol 2-3, sodium carboxymethylcellulose 1-1.3, sulfurized olefin cotton oil 2-3, electrolytic manganese residues 10-14, kaolin 15-20, strontium aluminate 8-12, glycerophosphate 2-3, polyurethane resin 5-6, clay 200-220, water are appropriate, auxiliary agent 20-30;
Described auxiliary agent is made up of the raw material of following weight portion: useless porcelain 18-22, cullet 2-3, sodium carbonate 2-3, bentonite 3-4, carboxymethyl cellulose 0.5-1, clay 3-4, calgon 1-1.4, PP wax 1-1.4, dextrin 1-1.4, water are appropriate; Preparation method is: carry out ball milling by after useless porcelain, cullet, sodium carbonate, bentonite mixing, cross 200 mesh sieves, calcine 5-6 hour, be ground into the particle that particle diameter is less than 2mm at 1200-1220 DEG C; Add in 4-5 weight parts water by clay, carboxymethyl cellulose, dextrin, add described particle, stir after stirring, dry, pulverize, particle diameter at 0.05-2mm, then mixes with other residual components, stirs, to obtain final product.
2. the preparation method of the good high temperature resistant molding sand of release property according to claim 1, is characterized in that comprising the following steps:
(1) by clay, electrolytic manganese residues, kaolin, strontium aluminate mixing, pulverize, cross 50 mesh sieves, the water adding 7-9% weight portion stirs, granulation, particle diameter, at 0.05-2.5mm, is sent in calcining furnace, pre-burning 20-25 minute at 300-400 DEG C, then sinter at 1230-1270 DEG C, take out, polish to surface roughness≤0.1mm, obtain clay particle;
(2) by polyethylene glycol, sodium carboxymethylcellulose, sulfurized olefin cotton oil, glycerophosphate, polyurethane resin, magnesia mixing, grinding 10-15 minute, obtains mixed material;
(3) material that described clay particle, (2) step obtain is mixed with other residual components, then add the water mixing 7-10 minute of 3.9-4.7% weight portion, to obtain final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510199804.3A CN104841847A (en) | 2015-04-25 | 2015-04-25 | High temperature resistant molding sand with good mold release property and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510199804.3A CN104841847A (en) | 2015-04-25 | 2015-04-25 | High temperature resistant molding sand with good mold release property and preparation method thereof |
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| CN104841847A true CN104841847A (en) | 2015-08-19 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58202943A (en) * | 1982-05-19 | 1983-11-26 | Nissan Motor Co Ltd | Resin coated sand for casting |
| CN104439040A (en) * | 2014-12-01 | 2015-03-25 | 昌利锻造有限公司 | Molding sand applied to copper alloy castings and preparation method of molding sand |
| CN104475662A (en) * | 2014-12-01 | 2015-04-01 | 昌利锻造有限公司 | Molding sand for magnesium alloy castings and preparation method of molding sand |
| CN104475646A (en) * | 2014-11-03 | 2015-04-01 | 繁昌县琦祥铸造厂 | Heat resistance and good plasticity molding sand and preparation method thereof |
| CN104493072A (en) * | 2014-11-26 | 2015-04-08 | 马鞍山市恒达耐磨材料有限责任公司 | Molding sand for heat-resistant steel members and preparation method thereof |
-
2015
- 2015-04-25 CN CN201510199804.3A patent/CN104841847A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58202943A (en) * | 1982-05-19 | 1983-11-26 | Nissan Motor Co Ltd | Resin coated sand for casting |
| CN104475646A (en) * | 2014-11-03 | 2015-04-01 | 繁昌县琦祥铸造厂 | Heat resistance and good plasticity molding sand and preparation method thereof |
| CN104493072A (en) * | 2014-11-26 | 2015-04-08 | 马鞍山市恒达耐磨材料有限责任公司 | Molding sand for heat-resistant steel members and preparation method thereof |
| CN104439040A (en) * | 2014-12-01 | 2015-03-25 | 昌利锻造有限公司 | Molding sand applied to copper alloy castings and preparation method of molding sand |
| CN104475662A (en) * | 2014-12-01 | 2015-04-01 | 昌利锻造有限公司 | Molding sand for magnesium alloy castings and preparation method of molding sand |
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Application publication date: 20150819 |
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