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A kind of preparation method of coating for aluminum alloy low pressure casting metal mold

A low-pressure casting and metal mold technology, applied in the low-pressure casting of aluminum alloys and casting fields, can solve the problems of poor thermal insulation performance, time-consuming, troublesome operation of blending and formulating coatings, etc., and achieve the effect of smooth casting surface, wide source of raw materials, and simple operation.

Active Publication Date: 2016-01-20
JIANGSU HIDA MARINE VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practice has proved that the obvious defects of this technology are: ① It is troublesome and time-consuming to mix and prepare coatings; ② The cost of raw materials is high, which affects product benefits; Causes the cavity to stick and burn; ④The surface quality of the produced castings is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing an aluminum alloy low-pressure casting metal mold coating, comprising the steps of:

[0022] 1) The composition of the paint is, in terms of mass fraction: 35% mullite powder, 10% alumina powder, 5.5% sodium bentonite, 2.5% polyvinyl alcohol, 0.8% sodium alginate, 4.0% silica sol, 0.8% ten Sodium dialkylbenzene sulfonate, the balance is water, and the ingredients are weighed according to the above components;

[0023] 2) First add 200-280 mesh sodium bentonite, 200-280 mesh mullite powder, and 200-280 mesh alumina powder into the wheel mill according to the above ratio, and dry mix for 15 minutes;

[0024] 3) Then add sodium alginate, sodium dodecylbenzenesulfonate, polyvinyl alcohol and water in sequence according to the above ratio, and mix and grind for 240 minutes;

[0025] 4) Then add silica sol and mix for 30 minutes according to the above ratio;

[0026] 5) Finally, sieve the mixed and milled paint through a 100-mesh sieve to remove impur...

Embodiment 2

[0028] A method for preparing an aluminum alloy low-pressure casting metal mold coating, comprising the steps of:

[0029] 1) The composition of the coating is, by mass fraction: 45% mullite powder, 5% alumina powder, 6.5% sodium bentonite, 2.0% polyvinyl alcohol, 1.0% sodium alginate, 3.5% silica sol, 1.0% ten Sodium dialkylbenzene sulfonate, the balance is water, and the ingredients are weighed according to the above components;

[0030] 2) First add 200-280 mesh sodium bentonite, 200-280 mesh mullite powder, and 200-280 mesh alumina powder into the wheel mill according to the above ratio, and dry mix for 25 minutes;

[0031] 3) Then add sodium alginate, sodium dodecylbenzenesulfonate, polyvinyl alcohol and water in sequence according to the above ratio, and mix and grind for 180 minutes;

[0032] 4) Then according to the above ratio, add silica sol and mix for 40 minutes;

[0033] 5) Finally, sieve the mixed and milled paint through an 80-mesh sieve to remove impurities. ...

Embodiment 3

[0035] A method for preparing an aluminum alloy low-pressure casting metal mold coating, comprising the steps of:

[0036] 1) The composition of the paint is, in terms of mass fraction: 40% mullite powder, 8% alumina powder, 6% sodium bentonite, 2.3% polyvinyl alcohol, 0.9% sodium alginate, 3.8% silica sol, 0.9% ten Sodium dialkylbenzene sulfonate, the balance is water, and the ingredients are weighed according to the above components;

[0037] 2) First add 200-280 mesh sodium bentonite, 200-280 mesh mullite powder, and 200-280 mesh alumina powder into the wheel mill according to the above ratio, and dry mix for 20 minutes;

[0038] 3) Then add sodium alginate, sodium dodecylbenzenesulfonate, polyvinyl alcohol and water in sequence according to the above ratio, and mix and grind for 210 minutes;

[0039] 4) Then add silica sol according to the above ratio and mix and grind for 35 minutes;

[0040] 5) Finally, sieve the mixed and milled paint through a 90-mesh sieve to remove...

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Abstract

The invention discloses a method for preparing a paint used for an aluminum alloy low pressure casting metal type. The paint prepared by the invention comprises the following components: 35-45% of mullite powder, 5-10% of alumina powder, 5.5-6.5% of sodium bentonite, 2.0-2.5% of polyvinyl alcohol, 0.8-1.0% of sodium alginate, 3.5-4.0% of silica sol, 0.8-1.0% of sodium dodecyl benzene sulfonate and the balance of water. The preparation method of the invention has the advantages of wide raw material source, low cost and simple paint preparation process. The paint is used for aluminum alloy low pressure casting metal type, the casting is easy to demould, and the surface of the casting is smooth without the defects of scabs forming and adhesion.

Description

technical field [0001] The invention relates to the field of casting, in particular to the technical field of low-pressure casting aluminum alloys. Background technique [0002] There are many types of metal casting coatings, which are mainly distinguished by coating binders and high temperature resistant fillers. Commonly used binders include syrup, water glass, and polymer binders such as resins and polyvinyl alcohol. High temperature resistant fillers are black lead powder, spray carbon black, coke powder, high aluminum powder, etc. Commonly used syrup paint ingredients are: black lead powder > 30%, spray carbon black > 45%, syrup > 15%. After mixing these materials, put them in a rotary mixer, add an appropriate amount of water, and stir thoroughly for 1.5-2 hours. The paint density is required to be 1.2-1.3g / cm 3 between. Commonly used water glass binder coating components are: 80% carbon black, 20% water glass and an appropriate amount of water, density 1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00B22D18/04
Inventor 许立新
Owner JIANGSU HIDA MARINE VALVE
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