CN105108040A

CN105108040A - Low-hot-shrinkage-rate modified compound sodium silicate sand for steel castings and preparation method thereof

Info

Publication number: CN105108040A
Application number: CN201510500794.2A
Authority: CN
Inventors: 郭伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-08-14
Filing date: 2015-08-14
Publication date: 2015-12-02

Abstract

The invention discloses low-hot-shrinkage-rate modified compound sodium silicate sand for steel castings. According to the invention, quartz sand, used sand, high-alumina bauxite, glass beads and the like of different grain diameters and different proportions are used as raw sand materials; the air permeability and the strength are high, the mobility is high, heat resistance is high, the expansion factor is low, and the dimensional stability is high in the pouring process. Compared with traditional sodium silicate adhesives, modified sodium silicate adhesives are higher in strength, collapsibility and utilization rate. Activated carbon in the raw sand materials can adsorb sodium silicate molten at high temperature and prevent the sodium silicate from eroding the quartz sand and the like, and therefore the quality of the castings can be improved.

Description

A kind of steel-casting low heat shrinkage 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 heat shrinkage 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 heat shrinkage 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 heat shrinkage modification Compound Water glass sand, this complex sand is prepared by the raw material of following weight portion: nanometer spherical aluminium oxide 4-5,80-100 order quartz sand 20-30, glass bead 8-10,50-80 height of eye bauxite 12-15,60-80 order old sand 20-30,200-250 order active carbon 6-8, hydrophilic silicone oil 0.2-0.3, modified water glass bonding agent 2-3, neopelex 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 heat shrinkage modification Compound Water glass sand; described preparation method is: first neopelex, hydrophilic silicone oil are dissolved and be scattered in water; nanometer spherical aluminium oxide is dropped in solution; ultrasonicly it is made to be uniformly dispersed; then quartz sand, old sand, alumine, glass bead 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.

Advantage of the present invention is: select the quartz sand of different-grain diameter, different ratio, old sand, alumine and glass bead etc. as sand material; there is good gas permeability and intensity; good fluidity; to thermally-stabilised; the coefficient of expansion is low; good stability of the dimension in casting process; and the more traditional waterglass bonding agent of the waterglass bonding agent of modification has higher intensity and collapsibility; utilization rate is higher; and the waterglass that the active carbon energy absorbing high temp in sand material melts; prevent it to the erosion of the materials such as quartz sand, casting quality is improved.

Detailed description of the invention

A kind of steel-casting low heat shrinkage modification Compound Water glass sand, it is prepared by the raw material of following weight portion: nanometer spherical aluminium oxide 4,100 order quartz sand 25, glass bead 9,80 height of eye bauxite 14,80 order old sand 25,250 order active carbon 6, hydrophilic silicone oil 0.2, modified water glass bonding agent 2.5, neopelex 0.1, water 14.

Described modified water glass bonding agent is made up of the raw material of following weight portion: the waterglass 18 of 58 Baume degrees, mesoporous nano-alumina 2, aluminium-magnesium silicate 0.2, carboxymethyl cellulose 0.2, solid content are Ludox 4, lithium tetraborate 0.1, methenamine 0.01, the glucose 1.5 of 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 25min, mixed solution is heated to 500-60 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: first neopelex, hydrophilic silicone oil are dissolved in the water; nanometer spherical aluminium oxide is dropped in solution; ultrasonicly it is made to be uniformly dispersed; then quartz sand, old sand, alumine, glass bead 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: 0.12MPa; Air penetrability: 90%; Wet anti-intensity: the 428KPa of heat; Shatter index: 92%.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 heat shrinkage modification Compound Water glass sand; it is characterized in that, this complex sand is prepared by the raw material of following weight portion: nanometer spherical aluminium oxide 4-5,80-100 order quartz sand 20-30, glass bead 8-10,50-80 height of eye bauxite 12-15,60-80 order old sand 20-30,200-250 order active carbon 6-8, hydrophilic silicone oil 0.2-0.3, modified water glass bonding agent 2-3, neopelex 0.1-0.2, water 12-15.

2. a kind of steel-casting low heat shrinkage 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 heat shrinkage modification Compound Water glass sand as claimed in claim 1, it is characterized in that, described preparation method is: first by neopelex, hydrophilic silicone oil dissolves and is scattered in water, nanometer spherical aluminium oxide is dropped in solution, ultrasonicly it is made to be uniformly dispersed, then progressively quartz sand is added, old sand, alumine, glass bead, 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.