Special coating for lost-foam casting and production method thereof

A technology of lost foam casting and coating, applied in the field of iron and steel casting, to achieve the effects of reducing production costs, stable chemical properties, and good performance

Inactive Publication Date: 2020-05-19
十堰市勃瑞汽车零部件有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the problems existing in the existing lost foam coatings, the purpose of the present invention is to provide a special coating for lost foam casting with good coating performance, high strength and refractoriness, and good air permeability and its production method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: For thick-walled steel castings,

[0017] The composition ratio of the special paint for lost foam casting of the present invention is: 75 parts of quartz powder, 25 parts of bauxite, 10 parts of brown corundum, 1.5 parts of graphite powder, 8 parts of Huijian brand adhesive, 2 parts of silica sol, 0.4 part of sodium bentonite, 0.2 part of CMC, 0.02 part of OP-10 polyvinyl alcohol ether, 0.01 part of silicone defoamer. The preparation method of the coating is as follows:

[0018] 1) Mix the bonding agent Huijian brand bonding agent, silica sol, suspending agent sodium bentonite, CMC and water according to the described proportion and stir evenly at high speed, the stirring speed is 500r / min, and the stirring time is 50min. Prepare the colloidal solution of binder and suspending agent and water, wherein the weight ratio of water to aggregate quartz powder and bauxite is 0.68-0.75: 1;

[0019] 2) Add aggregate quartz powder, bauxite and additives brown corund...

Embodiment 2

[0021] Embodiment 2: For steel castings with medium wall thickness,

[0022] The composition ratio of the special paint for lost foam casting of the present invention is: 65 parts of quartz powder, 40 parts of bauxite, 5 parts of brown corundum, 1 part of graphite powder, 8 parts of Meizhu No. 5, 3 parts of silica sol, sodium base 0.2 parts of bentonite, 0.2 parts of CMC, 0.02 parts of OP-10 polyvinyl alcohol ether, 0.01 parts of silicone defoamer. The preparation method of the coating is as follows:

[0023] 1) Mix the adhesive Meizhu No. 5, silica sol, suspending agent sodium bentonite, CMC and water according to the stated ratio and stir evenly at high speed, the stirring speed is 550r / min, and the stirring time is 55min, and the obtained Colloidal solution of binder and suspending agent and water, wherein the weight ratio of water to aggregate quartz powder and bauxite is 0.68-0.75: 1;

[0024] 2) Add aggregate quartz powder, bauxite and additives brown corundum powder a...

Embodiment 3

[0026] Example 3: For thin-walled steel castings

[0027] The composition ratio of the special paint for lost foam casting of the present invention is: 60 parts of quartz powder, 40 parts of bauxite, 1 part of graphite powder, 8 parts of Meizhu No. 5, 0.1 part of sodium bentonite, OP-10 polyethylene glycol 0.02 part of alcohol ether, 0.01 part of silicone defoamer. The preparation method of the coating is as follows:

[0028]1) Mix the adhesive Meizhu No. 5 and the suspending agent sodium bentonite with water according to the stated ratio and stir evenly at a high speed, the stirring speed is 550r / min, and the stirring time is 55min to prepare the adhesive and suspending agent The colloidal solution of agent and water, wherein the weight ratio of water and aggregate quartz powder and bauxite is 0.68-0.75: 1; 2) Add aggregate quartz powder, bauxite and additives in a given proportion to the colloid solution Graphite powder continues to stir at a high speed evenly, and the sti...

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Abstract

The invention relates to a special coating for lost-foam casting and production method thereof. The coating is prepared from quartz powder, bauxite, brown fused alumina powder, graphite powder, an Huijian brand binder, Meizhu No.5, silica sol, sodium bentonite, CMC, OP-10 polyethylene alkyl alcohol ether and an organic silicon defoamer. The production method comprises the following steps of 1, mixing the Huijian brand binder, the Meizhu No.5, the silica sol, the sodium bentonite, the CMC and the water, and uniformly stirring at a high speed to prepare a colloidal solution; 2, adding the quartzpowder, the bauxite, the brown fused alumina powder and the graphite powder into the colloidal solution, and uniformly stirring at a high speed to prepare a semi-finished coating; and 3, adding the OP-10 polyethylene alkyl alcohol ether and the organic silicon defoaming agent into the semi-finished product coating, and uniformly stirring to prepare the special coating for lost-foam casting. The coating is good in usability, high in material utilization rate, rich in raw materials, simple in preparation process, good in casting surface quality, easy in coating stripping and suitable for lost-foam casting of thin-wall, medium-wall and thick-wall steel castings.

Description

technical field [0001] The invention belongs to the technical field of iron and steel casting, in particular to a special paint for lost foam casting and a production method thereof. Background technique [0002] At present, lost foam casting technology has been widely used. As one of the key technologies of lost foam casting, its coating technology directly affects the quality of castings. The main functions of lost foam casting coatings are as follows: first, to improve the strength and rigidity of the foamed plastic model clusters, and to prevent the deformation of the model clusters during transportation and operation. The second is to provide good air permeability and refractoriness to ensure that the decomposition products of foamed plastics can be discharged smoothly during the pouring process, and to prevent defects such as pores, carbon black, and sand sticking in castings. Third, as an isolation medium with high surface activity, it has excellent affinity to water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00B22C9/04
CPCB22C3/00B22C9/04
Inventor 赵宇航
Owner 十堰市勃瑞汽车零部件有限责任公司
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