CN105108041A

CN105108041A - High strength modified compound sodium silicate sand containing graphite fluoride for steel casting and preparation method thereof

Info

Publication number: CN105108041A
Application number: CN201510486812.6A
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 a high strength modified compound sodium silicate sand containing graphite fluoride for steel casting. According to the compound sodium silicate sand, used sand, silica sand, magnesia sand, potassium titanate whisker, graphite fluoride and the like of different grain diameters and different proportions are used as sand materials, the obtained moulding sand has excellent breathability and mechanical property, the mobility is good, the convective heat is stable, the moulding sand does not easily collapse and deform in the casting process, the surface lubricity is good, and the moulding sand is easy to clean; a modified sodium silicate adhesive has higher strength and collapsibility than the traditional sodium silicate adhesive, and the utilization ratio is higher; activated carbon in the sand materials can absorb sodium silicate which is molten under high temperature, and the erosion of the sodium silicate to the silica sand and other materials is prevented, so that the surface of a casting is smooth, and the quality is good.

Description

High strength modification Compound Water glass sand of a kind of steel-casting fluorinated graphite and preparation method thereof

Technical field

The present invention relates to cast steel molding sand manufacturing technology field, high strength modification Compound Water glass sand particularly relating to a kind of steel-casting fluorinated graphite 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, high strength modification Compound Water glass sand providing a kind of steel-casting fluorinated graphite and preparation method thereof.

The present invention is achieved by the following technical solutions:

A high strength modification Compound Water glass sand for steel-casting fluorinated graphite, this complex sand is prepared by the raw material of following weight portion: 100-150 order magnesia 12-15, nano-calcium carbonate 4-6,80-100 order quartz sand 22-25, potassium titanate crystal whisker 2-4,50-80 order old sand 35-40, fluorographite powder 1-2, 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 the high strength modification Compound Water glass sand of described a kind of steel-casting fluorinated graphite, described preparation method is: be first dissolved in the water by neopelex, nano-calcium carbonate is dropped in solution, ultrasonicly it is made to be uniformly dispersed, then old sand, quartz sand, magnesia, potassium titanate crystal whisker, fluorographite 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 different-grain diameter, the old sand of different ratio, quartz sand, magnesia, potassium titanate crystal whisker and fluorographite etc. are as sand material, the molding sand obtained has good gas permeability and mechanical property, good fluidity, to thermally-stabilised, not easily defeated and dispersed distortion in casting process, surface lubrication is good, be easy to cleaning, 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, cast(ing) surface is bright and clean, quality is better.

Detailed description of the invention

A high strength modification Compound Water glass sand for steel-casting fluorinated graphite, it is prepared by the raw material of following weight portion: 100 order magnesia 14, nano-calcium carbonate 5,80 order quartz sand 24, potassium titanate crystal whisker 3,80 order old sand 40, fluorographite powder 2, modified water glass bonding agent 3, neopelex 0.2, water 15.

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 2.5, aluminium-magnesium silicate 0.3, carboxymethyl cellulose 0.3, solid content are Ludox 4.5, lithium tetraborate 0.2, 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 50-60 DEG C, add other leftover materials one by one, be uniformly mixed 90min, to obtain final product.

Described modified sodium silicate sand preparation method is: be first dissolved in the water by neopelex, nano-calcium carbonate is dropped in solution, ultrasonicly it is made to be uniformly dispersed, then old sand, quartz sand, magnesia, potassium titanate crystal whisker, fluorographite is progressively added, be uniformly mixed heated-air drying after 40min, remove moisture completely, after cooling, add other leftover materials, continue to be uniformly mixed 5min, 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: 0.22MPa; Air penetrability: 92%; Wet anti-intensity: the 465KPa of heat; Shatter index: 90%.The cast(ing) surface obtained is bright and clean, and the very little flawless of pore, yield rate reaches more than 90%.

Claims

1. the steel-casting high strength modification Compound Water glass sand of fluorinated graphite, it is characterized in that, this complex sand is prepared by the raw material of following weight portion: 100-150 order magnesia 12-15, nano-calcium carbonate 4-6,80-100 order quartz sand 22-25, potassium titanate crystal whisker 2-4,50-80 order old sand 35-40, fluorographite powder 1-2, modified water glass bonding agent 2-3, neopelex 0.1-0.2, water 12-15.

2. the high strength modification Compound Water glass sand of a kind of steel-casting fluorinated graphite 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 the high strength modification Compound Water glass sand of a kind of steel-casting fluorinated graphite as claimed in claim 1, it is characterized in that, described preparation method is: be first dissolved in the water by neopelex, nano-calcium carbonate is dropped in solution, ultrasonicly it is made to be uniformly dispersed, then progressively old sand is added, quartz sand, magnesia, potassium titanate crystal whisker, fluorographite, 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.