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Special-purpose additive for powder paint for lost foam casting

A technology of lost foam casting and powder coating, which is applied to casting molding equipment, coatings, molds, etc.

Inactive Publication Date: 2009-05-13
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commercial coatings currently available on the market are difficult to meet these requirements at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Get suspending agent 15kg (lithium bentonite 10kg, letolith 5kg, the mass ratio of suspending agent is 15%) and put into the spiral mixer of 100kg capacity and stir for 5 minutes; Take rheology agent 20kg (sodium carboxymethyl cellulose 15kg , hydroxyethyl cellulose 5kg, the mass ratio of rheological agent is 20%); Then take by weighing organosilicon defoamer 4kg (mass ratio is 4%, the 3003 organosilicon defoamers that Shanghai Saibo Chemical Co., Ltd. produces) , binder 55kg (α starch 50kg, white latex 5kg, the mass ratio of binder is 55%), liquid defoamer (polyether defoamer), adopts 6kg sodium benzoate as preservative (mass ratio is 6% ), added to the mixer and continued to stir for 40 minutes to discharge.

Embodiment 2-6

[0018] Using the method of Example 1, each component was processed according to the proportioning described in the table below to prepare the required powder coating. ("%" in the following table refers to the mass percentage, and the mineral thixotropic agent is selected from the OBTN thixotropic lubricant of Wuhan Kaipu Trading Co., Ltd.)

[0019] Reality

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Abstract

The invention discloses a special powder coating additive for pulverous expendable pattern casting, and the powder additive comprises the following components: suspending agent (15-25 wt%), rheological agent (20-25 wt%), adhesive (35-55 wt%), organosilicon defoamer (4-10 wt%) and preservative agent in balancing amount. When the special additive is prepared, various pulverous materials are weighed by the required proportion, interposed into the powder stirrer in sequence to stir for 20 to 40 minutes at a low speed and then discharged and packed. When the powder coating is prepared by adopting the additive, the powder coating additive is weighed and prepared in the ratio of refractory material and additive of 100 to (6-10). After the low-speed stirred vessel is turned on, the powder coating weighed is interposed into the stirrer in batches, the stirring time is 10 to 20 minutes, and then the powder coating is discharged and packed. The additive is utilized after the powder coating manufactured is prepared into the slurry in a certain water-to-powder ratio; therefore, the special coating has the advantages of good suspension property, high intensity, uniform coating, good thixotropy, good leveling property, glabrous surface, no bubbles, no cracks and the like. Moreover, the user can adopts the dip-coating method, the hang-coating method and the brush-coating method, the viscosity change of coating materials can be decided upon the demands of the user, and different viscosities can realize different coating thicknesses.

Description

technical field [0001] The invention belongs to the technical field of metal material processing and metallurgy, and relates to a special additive for powdery lost foam cast steel and cast iron powder coatings. The additive is mixed with refractory materials in proportion to obtain cast steel and cast iron powder for lost foam The coating does not need to add other auxiliary materials, and it has the characteristics of simple equipment and short process when preparing coatings for lost foam casting cast steel and cast iron. Background technique [0002] Lost foam casting coating technology is one of the key processes that affect the success of the process. Since the lost foam casting technology is an advanced casting technology imported from abroad, the supporting coating is expensive. Therefore, most of the lost foam casting manufacturers in my country currently use self-made water-based colloidal coatings for production, and the obtained castings have rough surfaces and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00
Inventor 董选普黄乃瑜樊自田张磊陈东风魏必明
Owner HUAZHONG UNIV OF SCI & TECH
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