CN105108035A

CN105108035A - Low-thermal-expansion high-strength modified composite sodium silicate-bonded sand for steel casting and preparation method of modified composite sodium silicate-bonded sand

Info

Publication number: CN105108035A
Application number: CN201510487962.9A
Authority: CN
Inventors: 陈传松; 陈小乐
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-08-11
Filing date: 2015-08-11
Publication date: 2015-12-02

Abstract

The invention discloses low-thermal-expansion high-strength modified composite sodium silicate-bonded sand for steel casting. Used sand, quartz sand, active silica powder and the like with different grain diameters and different proportions are selected by the composite sand for serving as sand, and the good breathability and the good strength are achieved; during modeling, liquidity is good, the heated stability is good, and deformation is not prone to happening; and compared with a traditional sodium silicate binding agent, a modified sodium silicate binding agent has the higher strength, the higher collapsibility and the higher utilization rate, and the quality of the casting is effectively improved.

Description

A kind of steel-casting low thermal expansion high strength modification Compound Water glass sand and preparation method thereof

Technical field

The present invention relates to cast steel molding sand manufacturing technology field, particularly relate to a kind of steel-casting low thermal expansion high strength modification Compound Water glass sand and preparation method thereof.

Background technology

The quality of foundry goods is directly connected in the quality of the casting process Sand of steel part, molding sand is mainly mixed according to different ratios by Modeling Materials such as sand material, bonding agent and adminiclies, bonding agent is wherein the important Modeling Material of a class, the height of its comprehensive quality is directly connected to surface quality and the inherent quality of foundry goods, and current the most widely used bonding agent is mainly the inorganic adhesive of representative with water-glass sand and take furane resins as the resin adhesive of representative.

Use waterglass as the molding sand of bonding agent, there is the advantages such as equipment is simple, easy to operate, nonpoisonous and tasteless, cost is lower, but also there is a lot of shortcoming in it, obvious defect is mainly manifested in that intensity is low, collapsibility is poor, recycling is difficult, govern the application of water-glass sand, therefore a kind of efficient, low toxicity of necessary development, effectively improve the modified sodium silicate sand of casting quality, to adapt to industry demand, improve casting quality.

Summary of the invention

The object of the invention is exactly the defect in order to make up prior art, provides a kind of steel-casting low thermal expansion high strength modification Compound Water glass sand and preparation method thereof.

The present invention is achieved by the following technical solutions:

A kind of steel-casting low thermal expansion high strength modification Compound Water glass sand, this complex sand is prepared by the raw material of following weight portion: active micro silicon powder 4-5,80-100 order quartz sand 20-30, α-Al ₂o ₃micro mist 6-8,60-80 order old sand 35-40, nanometer silicon carbide 2-3, modified water glass bonding agent 2-3, neopelex 0.1-0.2, potassium silicate 0.1-0.2, water 12-15.

Described modified water glass bonding agent is made up of the raw material of following weight portion: the waterglass 15-20 of 55-60 Baume degrees, mesoporous nano-alumina 2-3, aluminium-magnesium silicate 0.2-0.3, carboxymethyl cellulose 0.2-0.3, solid content are Ludox 4-5, lithium tetraborate 0.1-0.2, methenamine 0.01-0.02, the glucose 1-2 of 20-25%; Its preparation method is: first drop in Ludox by mesoporous nano-alumina, the ultrasonic mesoporous nano-alumina that makes is dispersed in the solution, add waterglass more subsequently, continue dispersed with stirring 20-30min, mixed solution is heated to 50-60 DEG C, add other leftover materials one by one, be uniformly mixed 80-100min, to obtain final product.

The preparation method of described a kind of steel-casting low thermal expansion high strength modification Compound Water glass sand, described preparation method is: be first dissolved in the water by neopelex, nanometer silicon carbide is dropped in solution, ultrasonicly make it be uniformly dispersed, then progressively add old sand, quartz sand, active micro silicon powder, be uniformly mixed heated-air drying after 30-40min, remove moisture completely, add other leftover materials after cooling, continue to be uniformly mixed 4-5min, shake out after being blown into carbon dioxide solidification and get final product.

Advantage of the present invention is: select the old sand of different-grain diameter, different ratio, quartz sand, active micro silicon powder etc. as sand material, there is good gas permeability and intensity, good fluidity during moulding, by Heat stability is good, not yielding, and the more traditional waterglass bonding agent of the waterglass bonding agent of modification has higher intensity and collapsibility, utilization rate is higher, effectively raises the quality of foundry goods.

Detailed description of the invention

A kind of steel-casting low thermal expansion high strength modification Compound Water glass sand, it is prepared by the raw material of following weight portion: active micro silicon powder 4,80 order quartz sand 28, α-Al ₂o ₃micro mist 8,60 order old sand 38, nanometer silicon carbide 2.5, modified water glass bonding agent 2.5, neopelex 0.1, potassium silicate 0.1, water 12.

Described modified water glass bonding agent is made up of the raw material of following weight portion: the waterglass 18 of 55 Baume degrees, mesoporous nano-alumina 3, aluminium-magnesium silicate 0.3, carboxymethyl cellulose 0.2, solid content are Ludox 4.5, lithium tetraborate 0.2, methenamine 0.02, the glucose 1.5 of 20%; Its preparation method is: first drop in Ludox by mesoporous nano-alumina, the ultrasonic mesoporous nano-alumina that makes is dispersed in the solution, add waterglass more subsequently, continue dispersed with stirring 30min, mixed solution is heated to 50-60 DEG C, add other leftover materials one by one, be uniformly mixed 85min, to obtain final product.

Described modified sodium silicate sand preparation method is: be first dissolved in the water by neopelex, nanometer silicon carbide is dropped in solution, ultrasonicly it is made to be uniformly dispersed, then old sand, quartz sand, active micro silicon powder is progressively added, be uniformly mixed heated-air drying after 35min, remove moisture completely, after cooling, add other leftover materials, continue to be uniformly mixed 4min, shake out after being blown into carbon dioxide solidification and get final product.

The performance test results of the molding sand that the present embodiment prepares is:

Green compression strength: 0.18MPa; Air penetrability: 86%; Wet anti-intensity: the 442KPa of heat; Shatter index: 89%.The cast(ing) surface obtained is bright and clean, and the very little flawless of pore, yield rate reaches more than 90%.

Claims

1. a steel-casting low thermal expansion high strength modification Compound Water glass sand, it is characterized in that, this complex sand is prepared by the raw material of following weight portion: active micro silicon powder 4-5,80-100 order quartz sand 20-30, α-Al ₂o ₃micro mist 6-8,60-80 order old sand 35-40, nanometer silicon carbide 2-3, modified water glass bonding agent 2-3, neopelex 0.1-0.2, potassium silicate 0.1-0.2, water 12-15.

2. a kind of steel-casting low thermal expansion high strength modification Compound Water glass sand as claimed in claim 1, it is characterized in that, described modified water glass bonding agent is made up of the raw material of following weight portion: the waterglass 15-20 of 55-60 Baume degrees, mesoporous nano-alumina 2-3, aluminium-magnesium silicate 0.2-0.3, carboxymethyl cellulose 0.2-0.3, solid content are Ludox 4-5, lithium tetraborate 0.1-0.2, methenamine 0.01-0.02, the glucose 1-2 of 20-25%; Its preparation method is: first drop in Ludox by mesoporous nano-alumina, the ultrasonic mesoporous nano-alumina that makes is dispersed in the solution, add waterglass more subsequently, continue dispersed with stirring 20-30min, mixed solution is heated to 50-60 DEG C, add other leftover materials one by one, be uniformly mixed 80-100min, to obtain final product.

3. the preparation method of a kind of steel-casting low thermal expansion high strength modification Compound Water glass sand as claimed in claim 1, it is characterized in that, described preparation method is: be first dissolved in the water by neopelex, nanometer silicon carbide is dropped in solution, ultrasonicly it is made to be uniformly dispersed, then old sand, quartz sand, active micro silicon powder is progressively added, be uniformly mixed heated-air drying after 30-40min, remove moisture completely, other leftover materials are added after cooling, continue to be uniformly mixed 4-5min, shake out after being blown into carbon dioxide solidification and get final product.