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Preparation method and usage method for foundry silicate binder

A technology of silicate and binder, which is applied in the field of preparation of silicate binder for casting, which can solve the problems of increased water glass addition, accelerated gelation speed, and increased surface tension, and achieves low addition , Improve recycling rate, good collapsibility effect

Inactive Publication Date: 2013-03-27
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It shows that the modulus and density of water glass remain basically unchanged, but the viscosity continues to decrease, the surface tension continues to increase, the gelation speed is accelerated, and the bonding strength is also significantly reduced, resulting in an increase in the amount of water glass added, making the casting The worse the collapsibility of the post-molding sand

Method used

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  • Preparation method and usage method for foundry silicate binder
  • Preparation method and usage method for foundry silicate binder

Examples

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Effect test

preparation example Construction

[0022] The invention provides a method for preparing a silicate binder for casting, comprising the following steps:

[0023] The water glass with a modulus of 1.9-3.0 is spray-dried to obtain a silicate binder for casting, and the solid content of the water glass is 20%-75%.

[0024] In the present invention, the water glass with a modulus of 1.9~3.0 is spray-dried. During the spray-drying process, after the water glass is atomized, the moisture in the water glass is taken away by the high-temperature air flow, and the obtained silicate is hollow and fluffy. Solid powder, which has better instant performance, can be dissolved in water in a short period of time to form water glass. Before use, it is only necessary to dissolve the silicate binder for casting obtained by the present invention in water to prepare the The solution of the required concentration is enough, avoiding the aging phenomenon of water glass in the prior art during use, so that it has good bonding performanc...

Embodiment 1

[0048] Under stirring condition, in the sodium water glass that modulus M is 2.4, add the sodium tripolyphosphate that mass fraction is sodium water glass quality 3.0% and the sodium tetraborate that mass fraction is sodium water glass quality 4.0%, the mixture obtained Heating and dissolving at 95°C to obtain uniform modified water glass, and then spray-drying the obtained modified water glass to obtain modified instant powdery sodium silicate;

[0049] Under the condition of rapid stirring, add the modified instant powdery sodium silicate into an appropriate amount of water at 40°C to dissolve it to form an aqueous solution with a solid content of 45wt%, which can be used after the temperature drops to room temperature.

[0050] Add 1000g of standard sand for the detection binder into the SHY blade type sand mixer, add 3.75g of glycerol triacetate to it, mix for 60s, add 25g of the aqueous solution with a solid content of 45wt% obtained in this example, and mix After 60s, th...

Embodiment 2

[0052] Under agitation, add sucrose and sodium water glass and potassium water that account for 4.0% of the total mass of sodium water glass and potassium water glass to sodium water glass and potassium water glass with a modulus M of 2.1 in a weight ratio of 1:1 The total mass of the glass is 0.2% polyacrylamide, and the obtained mixture is heated and dissolved at 70°C to obtain a uniform modified water glass, and then the obtained modified water glass is spray-dried to obtain a modified instant powder silicate .

[0053] Under the condition of rapid stirring, add the modified instant powdered silicate into an appropriate amount of water at 50°C to dissolve it to form an aqueous solution with a solid content of 50wt%, which can be used after the temperature drops to room temperature.

[0054] Put 1000g of standard sand for testing binder into the SHY blade type sand mixer, add 3.3g of triacetin to it, mix for 60s, add 22g of the aqueous solution with a solid content of 50wt% ...

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Abstract

The invention provides a preparation method for a foundry silicate binder. Sodium silicate with modulus of 1.9-3.0 is subjected to spraying and drying to obtain foundry silicate binder. According to the preparation method, the sodium silicate is firstly modified and the modified sodium silicate is subjected to spraying and drying to obtain foundry silicate binder. According to the preparation method, the sodium silicate or the modified sodium silicate is subjected to spraying and drying, moisture in the atomized sodium silicate can be carried away by high-temperature air in the spraying and drying processes, the obtained foundry silicate binder is hollow and fluffy solid powder, and is only needed to be dissolved in water to prepare a solution with needed concentration before use due to good quick dissolution property. With the method, the problem of the existing sodium silicate binder can be well avoided, the sodium silicate can be always in a best usage state, the binding property is good, the addition quantity is less, the collapsibility is good, the foundry silicate binder is beneficial to recovery of used sand, and the pollution to the environment can be reduced.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a preparation method and a use method of a silicate binder for casting. Background technique [0002] Water glass is divided into sodium water glass and potassium water glass. It is an aqueous solution of silicate. It has a wide range of uses and almost covers all sectors of the national economy. In the chemical system, it is used to manufacture various silicate products such as silica gel, white carbon black, zeolite molecular sieve, sodium metasilicate, silica sol, layer silicon, potassium sodium silicate, etc. It is the basic raw material of silicon compounds; in light industry It is an indispensable raw material in detergents such as washing powder and soap, and is also a water softener and sedimentation aid; it is used in dyeing, bleaching and sizing in the textile industry; it is used in the manufacture of quick-drying cement and acid-resistant cement in the construction i...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B12/04
Inventor 祝建勋胡廷峰焦芬
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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