CN104646599A - Heat-resisting molding sand with high bonding performance and preparation method thereof - Google Patents

Abstract

The invention discloses heat-resisting molding sand with high bonding performance. The heat-resisting molding sand is prepared from the following raw materials in parts by weight: 4-5 parts of abrasive alumina, 26-30 parts of waste heat-resisting glass, 2-3 parts of zirconium phosphate, 3-5 parts of flaky alumina, 55-60 parts of quartz sand, 4-6 parts of microcrystalline foamed ceramic powder, 2-2.5 parts of furan resin, 2-2.5 parts of diatomite, 3-5 parts of cristobalite powder, 0.1-0.2 part of a titanate coupling agent, 4-5 parts of modified pulverized coal, and 4-5 parts of water; the furan resin, the diatomite, the cristobalite powder, and the titanate coupling agent are used in the molding sand disclosed by the invention, so that the bonding performance of the molding sand is improved, the production of ash content is reduced, and the quality stability of the molding sand is ensured; by adding the waste heat-resisting glass and the microcrystalline foamed ceramic powder, the heat resistance of the molding sand is improved, and energy conservation and emissions reduction are achieved; and by adding the flaky alumina, the liquidity and plasticity of the molding sand are improved.

Description

Heat-resisting molding sand of a kind of high-adhesion and preparation method thereof

Technical field

The present invention relates to casting field, particularly relate to heat-resisting molding sand of a kind of high-adhesion and preparation method thereof.

Background technology

So-called foundry clay green-sand, refers to by roughing sand, binding agent and conforms to thing and coordinate by a certain percentage, through overmulling system, meeting the compound of modeling requirement.Because clay green-sand casting material therefor is cheap and easy to get, casting mold is simple and convenient, and all can adapt to the single-piece production of foundry goods, in batch a large amount of production, for a long time, be the basic technology of Foundry Production always.

Molding sand will have following characteristic: 1, good permeability, and after high-temperature metal liquid cast-iron pours into casting mold, producing gas must discharge smoothly in casting mold; 2, good intensity, ensures that molding sand must possess sufficiently high intensity and deformability; 3, there is good fire resistance, the integrality 4 of thermal effect at high temperature sand mold, safe and reliable, simple to operate, easy construction can be resisted, the reduction of erection time; 5, heat endurance, mobility, plasticity, compact rate of molding are good.

Existing foundry goods also exists a lot of problem, the such as phenomenon such as buckle, sand washing, drop, sweat, pore, pin hole, shrinkage cavity and porosity, loose, crackle, scab, scab, rough surface, elephant skin, shrinkage depression, this all has very large relation with molding sand, need the performance constantly improving molding sand, can improve from raw material and sand mulling craft.

In addition, coal dust is added in foundry goods green-sand, scab defect can be prevented, improve the surface smoothness of foundry goods, and burning into sand defect can be reduced, improve the defeated and dispersed function of molding sand, for wet type G. Iron Castings, effectively can also prevent subcutaneous blowhole, available circular vortex burner, air is without preheating.The size of pulverized coal particle, shape, mobility, phosphorus content, volatile matter number, ash content content determine the performance quality of foundry goods, the quality of foundry goods can be improved by the performance improving coal dust.

Summary of the invention

The object of the present invention is to provide heat-resisting molding sand of a kind of high-adhesion and preparation method thereof, the caking property of this molding sand is good, and ash content is few, good heat resistance, energy-saving and emission-reduction.

Technical scheme of the present invention is as follows:

The heat-resisting molding sand of a kind of high-adhesion, is characterized in that being made up of the raw material of following weight portion: abrasive material aluminium oxide 4-5, waste and old heat resistant glass 26-30, basic zirconium phosphate 2-3, tabular alumina 3-5, quartz sand 55-60, crystallite foamed ceramics powder 4-6, furane resins 2-2.5, diatomite 2-2.5, cristobalite powder 3-5, titanate coupling agent 0.1-0.2, modification coal dust 4-5, water 4-5;

Described modification coal dust is made up of the raw material of following weight portion: brown coal powder 3-3.5, ferrocene 0.05-0.08, lignosulfonate 0.02-0.04, ethanol 4-6, sodium chloride 0.1-0.2, potassium permanganate 0.2-0.3, lanthana 0.01-0.02, manganese dioxide 0.02-0.03, magnesia 0.1-0.2, nano-sized carbon 0.2-0.3; Preparation method is: add in ethanol by nano-sized carbon, lanthana, stir, add brown coal powder, and being ground to grain diameter is 10-40 μm, spraying dry in atmosphere of hydrogen, then mixes with other residual components, and sealing, to obtain final product.

The preparation method of the heat-resisting molding sand of described high-adhesion, is characterized in that comprising the following steps:

(1) waste and old heat resistant glass pulverizing is mixed with quartz sand, sieve, obtain the sand of particle diameter at 0.3-1.2mm, add in simpson mill together with abrasive material aluminium oxide, crystallite foamed ceramics powder, mixing 25-30 minute, then add the water of 40%, mixing 10-15 minute, obtains mixed sand;

(2) by furane resins, diatomite, cristobalite powder, titanate coupling agent mixing, add the water of 10%, be heated to 60-70 DEG C, stir 10-15 minute, then send into three-roll grinder, grinding 20-30 minute, obtains adhesive;

(3) adhesive (2) step obtained and other residual components join in the puddle mixer in (1) step, and evenly do not add remaining water to spray shape under halt condition, wet mixing 6-8 minute, to obtain final product.

Beneficial effect of the present invention

Molding sand of the present invention employs furane resins, diatomite, cristobalite powder, titanate coupling agent, adds the caking property of molding sand, decreases the generation of ash content, ensure that the quality stability of molding sand; By adding waste and old heat resistant glass, crystallite foamed ceramics powder, add the heat resistance of molding sand, energy-saving and emission-reduction; By adding tabular alumina, improve the mobility of molding sand, plasticity; Modification coal dust of the present invention, volatile matter is many, and ash content is few, uniform particles, good fluidity, adds the bright property of foundry goods, decreases the pore of 10-13%, burning into sand defect, improves collapsibility.

Detailed description of the invention

The heat-resisting molding sand of a kind of high-adhesion, is made up of the raw material of following weight portion (kilogram): abrasive material aluminium oxide 4.5, waste and old heat resistant glass 28, basic zirconium phosphate 2.5, tabular alumina 4, quartz sand 58, crystallite foamed ceramics powder 5, furane resins 2.3, diatomite 2.3, cristobalite powder 4, titanate coupling agent 0.1, modification coal dust 4.5, water 4.5;

Described modification coal dust is made up of the raw material of following weight portion (kilogram): brown coal powder 3.3, ferrocene 0.06, lignosulfonate 0.03, ethanol 5, sodium chloride 0.1, potassium permanganate 0.2, lanthana 0.02, manganese dioxide 0.03, magnesia 0.2, nano-sized carbon 0.3; Preparation method is: add in ethanol by nano-sized carbon, lanthana, stir, add brown coal powder, and being ground to grain diameter is 10-40 μm, spraying dry in atmosphere of hydrogen, then mixes with other residual components, and sealing, to obtain final product.

The preparation method of the heat-resisting molding sand of described high-adhesion, comprises the following steps:

(1) waste and old heat resistant glass pulverizing is mixed with quartz sand, sieve, obtain the sand of particle diameter at 0.3-1.2mm, add in simpson mill together with abrasive material aluminium oxide, crystallite foamed ceramics powder, mix 28 minutes, then add the water of 40%, mix 13 minutes, obtain mixed sand;

(2) by furane resins, diatomite, cristobalite powder, titanate coupling agent mixing, add the water of 10%, be heated to 65 DEG C, stir 13 minutes, then send into three-roll grinder, grind 25 minutes, obtain adhesive;

(3) adhesive (2) step obtained and other residual components join in the puddle mixer in (1) step, and evenly do not add remaining water to spray shape under halt condition, wet mixing 7 minutes, to obtain final product.

Experimental data

The testing result of the present embodiment molding sand is as follows: green compression strength 0.19MPa, normal temperature green tensile strength 24Kpa, hot green tensile strength 3.5KPa, gas forming amount 12 ml/g, gas permeability 140, clay content 11%.

Claims (2)

1. the heat-resisting molding sand of high-adhesion, is characterized in that being made up of the raw material of following weight portion: abrasive material aluminium oxide 4-5, waste and old heat resistant glass 26-30, basic zirconium phosphate 2-3, tabular alumina 3-5, quartz sand 55-60, crystallite foamed ceramics powder 4-6, furane resins 2-2.5, diatomite 2-2.5, cristobalite powder 3-5, titanate coupling agent 0.1-0.2, modification coal dust 4-5, water 4-5;

Described modification coal dust is made up of the raw material of following weight portion: brown coal powder 3-3.5, ferrocene 0.05-0.08, lignosulfonate 0.02-0.04, ethanol 4-6, sodium chloride 0.1-0.2, potassium permanganate 0.2-0.3, lanthana 0.01-0.02, manganese dioxide 0.02-0.03, magnesia 0.1-0.2, nano-sized carbon 0.2-0.3; Preparation method is: add in ethanol by nano-sized carbon, lanthana, stir, add brown coal powder, and being ground to grain diameter is 10-40 μm, spraying dry in atmosphere of hydrogen, then mixes with other residual components, and sealing, to obtain final product.

2. the preparation method of the heat-resisting molding sand of high-adhesion according to claim 1, is characterized in that comprising the following steps:

(1) waste and old heat resistant glass pulverizing is mixed with quartz sand, sieve, obtain the sand of particle diameter at 0.3-1.2mm, add in simpson mill together with abrasive material aluminium oxide, crystallite foamed ceramics powder, mixing 25-30 minute, then add the water of 40%, mixing 10-15 minute, obtains mixed sand;

(2) by furane resins, diatomite, cristobalite powder, titanate coupling agent mixing, add the water of 10%, be heated to 60-70 DEG C, stir 10-15 minute, then send into three-roll grinder, grinding 20-30 minute, obtains adhesive;

(3) adhesive (2) step obtained and other residual components join in the puddle mixer in (1) step, and evenly do not add remaining water to spray shape under halt condition, wet mixing 6-8 minute, to obtain final product.