CN105964875A - High-cohesiveness wet type molding sand used for cast flanges and a preparing method thereof - Google Patents

Abstract

High-cohesiveness wet type molding sand used for cast flanges and a preparing method thereof are disclosed. The molding sand is prepared from 10-15 parts by weight of fused ceramite, 6-12 parts by weight of electrolytic manganese residues, 5-10 parts by weight of kyanite tailings, 18-24 parts by weight of dolomite, 7-14 parts by weight of allophane, 5-10 parts by weight of pitchstone, 9-16 parts by weight of red mud, 3-7 parts by weight of sugar residue, 15-20 parts by weight of quartz sand, 4-8 parts by weight of hydroxypropyl starch ether, 2-5 parts by weight of sodium tripolyphosphate, 3-6 parts by weight of polyvinyl acetate homopolymerized powder and 75-95 parts by weight of a modifier. Through cooperative application of the dolomite and the red mud with the sugar residues, the hydroxypropyl starch ether, the sodium tripolyphosphate and the polyvinyl acetate homopolymerized powder, cohesiveness of the molding sand can be improved, quality stability of the molding sand is ensured and sand molds and mold cores are endowed with enough strength on the basis of ensuring air peamelibility and collapsibility of the molding sand, and therefore the sand molds and the mold cores are not liable to break in conveying, assembling and pouring processes and cast quality can be improved.

Description

A kind of cast flange high-adhesion green-sand and preparation method thereof

Technical field

The present invention relates to a kind of cast flange high-adhesion green-sand and preparation method thereof, belong to molding sand technical field.

Background technology

Molding sand is most important Modeling Material in sand casting process, typically by casting model powder, moulding sand binder and additional thing Mix according to a certain percentage Deng Modeling Material, it is also possible to natural silica sand argillaceous.Molding sand effect in Foundry Production Particularly important, the quality of Quality of sand mold directly affects the castings such as appearance quality and foundry goods generation sand holes, pore, the burning into sand of foundry goods and lacks Falling into, the casting wasted product caused because of the poor quality of molding sand accounts for the 30-50% of the total waste product of foundry goods.Continuous along with foundry engieering Development, more and more higher to the performance requirement of molding sand, the molding sand for cast flange also exists lacking of bad adhesion in the market Point, affects the quality of foundry goods.Therefore, a kind of cast flange high-adhesion green-sand of exploitation has great importance.

Summary of the invention

Present invention aims to the deficiencies in the prior art, it is provided that a kind of cast flange with high-adhesion green-sand and Its preparation method.

The technical solution used in the present invention is as follows:

A kind of cast flange high-adhesion green-sand, is made up of the raw material of following weight portion: nice foundry sand 10-15, electrolytic manganese residues 6-12, cyanite tailing 5-10, white clouds soil 18-24, allophane 7-14, pitchstone 5-10, red mud 9-16, sugar slag 3-7, stone Sand 15-20, hydroxypropyl starch ether 4-8, sodium tripolyphosphate 2-5, polyvinyl acetate homopolymerization rubber powder 3-6, modifier 75-95；

The preparation method of described modifying agent is as follows: a, take the raw material of following weight portion: polyacrylamide 18-26, Polyethylene Glycol 14- 22, calcium lignosulfonate 12-18, acetylation double starch adipate 5-10, Rhizoma amorphophalli powder 20-30, yellow starch gum 15-25, acrylic acid Methyl ester 45-55, butyl methacrylate 30-40, liquid rosin resin 10-15, dodecylbenzene sodium sulfonate 2-3, polysorbate60 1-2, Ammonium persulfate. 0.2-0.3, sodium sulfite 0.1-0.2；B, take Rhizoma amorphophalli powder, yellow starch gum, the double starch adipic acid of acetylation Ester mix homogeneously, adds the water being equivalent to mixture 3-5 times amount, and heating in water bath, to 75-85 DEG C, stirs 30-40min, is cooled to 40-50 DEG C, add liquid rosin resin, dodecylbenzene sodium sulfonate and polysorbate60, stir 15-20min, stand-by；C, by poly-third Acrylamide, Polyethylene Glycol, calcium lignosulfonate mix homogeneously, add the water being equivalent to mixture 4-6 times amount, stirs 8-14min, Adding acrylic acid methyl ester., butyl methacrylate, Ammonium persulfate., bisulfite, heating in water bath, to 70-80 DEG C, stirs 1-2h, It is subsequently adding the solution that step b prepares, continues stirring 20-30min, be cooled to less than 45 DEG C, then regulate with saturated ammonia aqueous solution PH value is 9-10.

The preparation method of a kind of cast flange high-adhesion green-sand, comprises the following steps:

(1) electrolytic manganese residues, cyanite tailing, allophane, pitchstone are pulverized respectively, cross 80-120 mesh sieve, 15-25s is dry mixed；

(2) by nice foundry sand, white clouds soil, red mud, sugar slag, quartz sand, hydroxypropyl starch ether, sodium tripolyphosphate, polyvinyl acetate Homopolymerization rubber powder mixing 1-2min, then adds the water wet mixing 2-4min accounting for mixture weight 2-3%, adds prepared the mixing of step (1) Compound, wet mixing 3-6min；

(3) mixture that step (3) prepares is mixed with modifying agent, 1500-2000rpm high speed dispersion 4-7min, filter, i.e. Can.

Modifying agent of the present invention is possible not only to improve the mobility of molding sand, breathability and dispersibility, can also increase type simultaneously The performances such as the thermostability of sand, mechanical strength and plasticity, thus ensure that combination property and the quality stability of molding sand, reach to change Kind surface quality of continuous castings, it is to avoid the appearance of the defects such as casting falling sand, burning into sand, pore.

Beneficial effects of the present invention:

The present invention is by white clouds soil, red mud and sugar slag, hydroxypropyl starch ether, sodium tripolyphosphate, polyvinyl acetate homopolymerization rubber powder With the use of, the caking property of molding sand can be improved on the basis of guarantee type sand permeability and collapsibility, it is ensured that the matter of molding sand Amount stability, gives sand mold and core with enough intensity so that it is carrying, assemble and in casting process indeformable and do not break Broken, thus improve the quality of foundry goods.

Detailed description of the invention

A kind of cast flange high-adhesion green-sand, is made up of the raw material of following weight (kg): nice foundry sand 12, electrolysis Manganese slag 10, cyanite tailing 7, white clouds soil 22, allophane 11, pitchstone 8, red mud 14, sugar slag 5, quartz sand 16, hydroxypropyl Starch ether 5, sodium tripolyphosphate 3, polyvinyl acetate homopolymerization rubber powder 4.5, modifier 85；

The preparation method of described modifying agent is as follows: a, take the raw material of following weight (kg): polyacrylamide 23, Polyethylene Glycol 19, Calcium lignosulfonate 15, acetylation double starch adipate 7, Rhizoma amorphophalli powder 25, yellow starch gum 20, acrylic acid methyl ester. 50, metering system Acid butyl ester 34, liquid rosin resin 11, dodecylbenzene sodium sulfonate 3, polysorbate60 1.5, Ammonium persulfate. 0.25, bisulfite Sodium 0.15；B, take Rhizoma amorphophalli powder, yellow starch gum, the double starch adipate mix homogeneously of acetylation, add and be equivalent to mixture 4 times amount Water, heating in water bath to 85 DEG C, stir 30min, be cooled to 50 DEG C, add liquid rosin resin, dodecylbenzene sodium sulfonate and Polysorbate60, stirs 15min, stand-by；C, by polyacrylamide, Polyethylene Glycol, calcium lignosulfonate mix homogeneously, addition is equivalent to The water of mixture 5 times amount, stirs 12min, adds acrylic acid methyl ester., butyl methacrylate, Ammonium persulfate., bisulfite, Heating in water bath, to 80 DEG C, stirs 1h, is subsequently adding the solution that step b prepares, and continues stirring 25min, is cooled to less than 45 DEG C, then It is 10 with saturated ammonia aqueous solution regulation pH value.

The preparation method of a kind of cast flange high-adhesion green-sand, comprises the following steps:

(1) electrolytic manganese residues, cyanite tailing, allophane, pitchstone are pulverized respectively, cross 80-120 mesh sieve, 20s is dry mixed；

(2) by nice foundry sand, white clouds soil, red mud, sugar slag, quartz sand, hydroxypropyl starch ether, sodium tripolyphosphate, polyvinyl acetate Homopolymerization rubber powder mixing 1min, then adds the water wet mixing 3min accounting for mixture weight 2%, adds the mixture that step (1) prepares, Wet mixing 4min；

(3) mixture that step (3) prepares is mixed with modifying agent, 1800rpm high speed dispersion 6min, filters,.

The performance test of the molding sand that above-described embodiment prepares is as shown in the table:

Project	Unit	Testing result
			Green compression strength	kPa	174
Hot green tensile strength	kPa	5.5
			Water content	%	3.2
Compact rate of molding	%	57
			Breathability	-	165
Shatter index	%	88
			Refractoriness	℃	1670

Claims (2)

1. a cast flange high-adhesion green-sand, it is characterised in that be made up of the raw material of following weight portion: nice foundry sand 10-15, electrolytic manganese residues 6-12, cyanite tailing 5-10, white clouds soil 18-24, allophane 7-14, pitchstone 5-10, red mud 9- 16, sugar slag 3-7, quartz sand 15-20, hydroxypropyl starch ether 4-8, sodium tripolyphosphate 2-5, polyvinyl acetate homopolymerization rubber powder 3-6, Modifier 75-95；

The preparation method of described modifying agent is as follows: a, take the raw material of following weight portion: polyacrylamide 18-26, Polyethylene Glycol 14- 22, calcium lignosulfonate 12-18, acetylation double starch adipate 5-10, Rhizoma amorphophalli powder 20-30, yellow starch gum 15-25, acrylic acid Methyl ester 45-55, butyl methacrylate 30-40, liquid rosin resin 10-15, dodecylbenzene sodium sulfonate 2-3, polysorbate60 1-2, Ammonium persulfate. 0.2-0.3, sodium sulfite 0.1-0.2；B, take Rhizoma amorphophalli powder, yellow starch gum, the double starch adipic acid of acetylation Ester mix homogeneously, adds the water being equivalent to mixture 3-5 times amount, and heating in water bath, to 75-85 DEG C, stirs 30-40min, is cooled to 40-50 DEG C, add liquid rosin resin, dodecylbenzene sodium sulfonate and polysorbate60, stir 15-20min, stand-by；C, by poly-third Acrylamide, Polyethylene Glycol, calcium lignosulfonate mix homogeneously, add the water being equivalent to mixture 4-6 times amount, stirs 8-14min, Adding acrylic acid methyl ester., butyl methacrylate, Ammonium persulfate., bisulfite, heating in water bath, to 70-80 DEG C, stirs 1-2h, It is subsequently adding the solution that step b prepares, continues stirring 20-30min, be cooled to less than 45 DEG C, then regulate with saturated ammonia aqueous solution PH value is 9-10.

The preparation method of cast flange high-adhesion green-sand the most according to claim 1, it is characterised in that include with Lower step:

(1) electrolytic manganese residues, cyanite tailing, allophane, pitchstone are pulverized respectively, cross 80-120 mesh sieve, 15-25s is dry mixed；

(2) by nice foundry sand, white clouds soil, red mud, sugar slag, quartz sand, hydroxypropyl starch ether, sodium tripolyphosphate, polyvinyl acetate Homopolymerization rubber powder mixing 1-2min, then adds the water wet mixing 2-4min accounting for mixture weight 2-3%, adds prepared the mixing of step (1) Compound, wet mixing 3-6min；

(3) mixture that step (3) prepares is mixed with modifying agent, 1500-2000rpm high speed dispersion 4-7min, filter, i.e. Can.