CN104588567A - Shock molding back sand and preparation method thereof - Google Patents

Abstract

Shock molding back sand is prepared from the following raw materials in parts by weight: 4-6 parts of liquid coumarone, 8-12 parts of an alkaline residue powder, 1-1.5 parts of epoxy butyl oleate, 16-20 parts of aluminum hydroxide, 30-35 parts of a manganese slag, 20-25 parts of ettringite, 1-1.4 parts of triethanolamine, 2-2.5 parts of diatomite, 4-5 parts of an organic silicon water repellent, 1-1.5 parts of hydroxypropyl methyl cellulose ether, 130-160 parts of clay, a proper amount of water, and 20-30 parts of an auxiliary agent. Through adopting the clay, the alkaline residue powder and other raw materials for sintering granulation, the molding sand is good in air permeability, good in dispersion and good in heat resistance, and can reduces environmental pollution; and the molding sand is applicable to the shock molding back sand, and especially applicable to gray cast iron cylinder bodies.

Description

A kind of jarring moulding floor sand and preparation method thereof

Technical field

The present invention relates to casting field, particularly relate to a kind of jarring moulding floor sand and preparation method thereof.

Background technology

There is particle size problem rambunctious in current molding sand, affects yield rate and the Modeling precision of foundry goods.Further, lack special molding sand for different types of foundry goods, make casting accuracy not high, yield rate is low.

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.

Above shortcoming needs to improve.

Summary of the invention

The object of the present invention is to provide a kind of jarring moulding floor sand and preparation method thereof, this sand permeability is good, good dispersion, and good heat resistance, decreases environmental pollution.

Technical scheme of the present invention is as follows:

A kind of jarring moulding floor sand, is characterized in that being made up of the raw material of following weight portion: liquid coumarone 4-6, alkaline residue powder 8-12, epoxyoleic acid butyl ester 1-1.5, aluminium hydroxide 16-20, manganese slag 30-35, entringite 20-25, triethanolamine 1-1.4, diatomite 2-2.5, organosilicon moisture repellent 4-5, hydroxypropyl methyl cellulose ether 1-1.5, clay 130-160, water are appropriate, auxiliary agent 20-30;

Described auxiliary agent is made up of the raw material of following weight portion: chromite sand 6-8, ceramic sand 4-5, walnut sand 2-3, aluminium oxide 3-4, silica 4-5, nice foundry sand 5-7, clay 2-3, silane coupler kh-550 0.5-1, magnesia 0.4-0.7; Preparation method is: carry out ball milling by after aluminium oxide, magnesia, silica mixing, cross 200 mesh sieves, 2-2.5 hour is calcined at 1400-1500 DEG C, add Quench in cold water, then be ground into the particle that particle diameter is less than 2mm, add chromite sand, walnut sand, grinding 30-40 minute, add other residual components, grinding 20-30 minute, to obtain final product.

The preparation method of described jarring moulding floor sand, is characterized in that comprising the following steps:

(1) by clay, alkaline residue powder, aluminium hydroxide, manganese slag, entringite 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 1270-1290 DEG C, take out, polish to surface roughness≤0.1mm, obtain clay particle;

(2) clay particle limit is seethed stirring limit and spray into organosilicon moisture repellent, mix, obtain hydrophobicity clay particle;

(3) clay particle that (3) step obtains is mixed with other residual components, then add the water mixing 7-11 minute of 5.2-5.8% weight portion, to obtain final product.

Beneficial effect of the present invention

Molding sand of the present invention is by using the granulation of the raw material such as clay, alkaline residue powder sintering, good permeability, good dispersion, and good heat resistance, decreases environmental pollution; Molding sand of the present invention is applicable to jarring moulding floor sand, is particularly useful for gray cast iron cylinder.Auxiliary agent of the present invention is high temperature resistant, good dispersion, and lubricity is good, good with the affinity of clay particle, can increase the plasticity of molding sand, gas permeability, mobility, heat resistance, prevent clay particle from boning, and improves the yield rate of foundry goods.

Detailed description of the invention

A kind of jarring moulding floor sand, is made up of the raw material of following weight portion (kilogram): liquid coumarone 5, alkaline residue powder 11, epoxyoleic acid butyl ester 1.3, aluminium hydroxide 18, manganese slag 33, entringite 23, triethanolamine 1.2, diatomite 2.3, organosilicon moisture repellent 4.5, hydroxypropyl methyl cellulose ether 1.3, clay 150, water are appropriate, auxiliary agent 25;

Described auxiliary agent is made up of the raw material of following weight portion (kilogram): chromite sand 7, ceramic sand 4.5, walnut sand 2.5, aluminium oxide 3.5, silica 4.5, nice foundry sand 6, clay 2.5, silane coupler kh-550 0.7, magnesia 0.6; Preparation method is: carry out ball milling by after aluminium oxide, magnesia, silica mixing, cross 200 mesh sieves, calcine 2.3 hours at 1450 DEG C, add Quench in cold water, then be ground into the particle that particle diameter is less than 2mm, add chromite sand, walnut sand, grind 35 minutes, add other residual components, grind 25 minutes, to obtain final product.

The preparation method of described jarring moulding floor sand, comprises the following steps:

(1) by clay, alkaline residue powder, aluminium hydroxide, manganese slag, entringite 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 1280 DEG C, take out, polish to surface roughness≤0.1mm, obtain clay particle;

(2) clay particle limit is seethed stirring limit and spray into organosilicon moisture repellent, mix, obtain hydrophobicity clay particle;

(3) clay particle that (3) step obtains is mixed with other residual components, then the water adding 5.5% weight portion mixes 9 minutes, to obtain final product.

The sand test data that the present embodiment obtains are as follows: green compression strength is 90KPa, gas permeability 98, and green tensile strength is 2.3KPa.

Claims (2)

1. a jarring moulding floor sand, is characterized in that being made up of the raw material of following weight portion: liquid coumarone 4-6, alkaline residue powder 8-12, epoxyoleic acid butyl ester 1-1.5, aluminium hydroxide 16-20, manganese slag 30-35, entringite 20-25, triethanolamine 1-1.4, diatomite 2-2.5, organosilicon moisture repellent 4-5, hydroxypropyl methyl cellulose ether 1-1.5, clay 130-160, water are appropriate, auxiliary agent 20-30;

Described auxiliary agent is made up of the raw material of following weight portion: chromite sand 6-8, ceramic sand 4-5, walnut sand 2-3, aluminium oxide 3-4, silica 4-5, nice foundry sand 5-7, clay 2-3, silane coupler kh-550 0.5-1, magnesia 0.4-0.7; Preparation method is: carry out ball milling by after aluminium oxide, magnesia, silica mixing, cross 200 mesh sieves, 2-2.5 hour is calcined at 1400-1500 DEG C, add Quench in cold water, then be ground into the particle that particle diameter is less than 2mm, add chromite sand, walnut sand, grinding 30-40 minute, add other residual components, grinding 20-30 minute, to obtain final product.

2. the preparation method of jarring moulding floor sand according to claim 1, is characterized in that comprising the following steps:

(1) by clay, alkaline residue powder, aluminium hydroxide, manganese slag, entringite 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 1270-1290 DEG C, take out, polish to surface roughness≤0.1mm, obtain clay particle;

(2) clay particle limit is seethed stirring limit and spray into organosilicon moisture repellent, mix, obtain hydrophobicity clay particle;

(3) clay particle that (3) step obtains is mixed with other residual components, then add the water mixing 7-11 minute of 5.2-5.8% weight portion, to obtain final product.