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A kind of low-cost environment-friendly alcohol-based cast iron coating and preparation method thereof

An alcohol-based cast iron, low-cost technology, used in casting molding equipment, coatings, molds, etc., can solve the problems of leveling, brushing, poor air permeability, poor sintering peeling, and poor surface quality of castings, etc. problem, to achieve good sinterability, obvious price advantage, and the effect of reducing pores

Active Publication Date: 2019-11-08
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, quartz powder has a phase change at high temperature, is unstable, and is easy to be wetted by molten iron when used simply. The sintering peeling property is not good, and it may cause sand sticking. These result in poor surface quality of castings

Method used

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  • A kind of low-cost environment-friendly alcohol-based cast iron coating and preparation method thereof
  • A kind of low-cost environment-friendly alcohol-based cast iron coating and preparation method thereof
  • A kind of low-cost environment-friendly alcohol-based cast iron coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1: Weigh 55 kg of bauxite, 6 kg of quartz powder, 3 kg of mullite powder, 3 kg of pyrophyllite powder, 2.43 kg of sodium bentonite, 2.67 kg of expandable graphite, 0.43 kg of rosin, and low-viscosity polyvinyl alcohol 0.47 kg of butyral, 27 kg of alcohol;

[0035] Step 2: Put the above powder in the mixing tank, start the mixer, and mix for 5 minutes;

[0036] Step 3: Pour half of the alcohol, namely 13.5 kg, into the mixing tank slowly, add while stirring, and stir for 25 minutes after adding;

[0037] Step 4: Slowly add the remaining half of the alcohol, namely 13.5 kg, into the mixing tank, stirring while adding, continue to stir for 5 minutes after the addition, the material can be used, the paint can be brushed, sprayed, or flow coated. Dip coating.

[0038] The effect of pouring castings is as figure 1 , It can be seen that the surface of the casting is smooth and clean.

Embodiment 2

[0040] Step 1: Weigh 48 kg of bauxite, 6 kg of quartz powder, 6 kg of mullite powder, 3 kg of pyrophyllite powder, 3.14 kg of sodium bentonite, 3.1 kg of expandable graphite, 0.38 kg of rosin, and low-viscosity polyvinyl alcohol 0.38 kg of butyral, 30 kg of alcohol;

[0041] Step 2: Put the above powder in the mixing tank, start the mixer, and mix for 5 minutes;

[0042] Step 3: Pour half of the alcohol, namely 15 kg, into the mixing tank slowly, add while stirring, and stir for 25 minutes after adding;

[0043] The fourth step: slowly add the remaining half of the alcohol, namely 15 kg, into the mixing tank, stirring while adding, and continue to stir for 5 minutes after the addition, the material can be used, the paint can be brushed, sprayed, or flow coated. Dip coating.

[0044] Pouring castings (spheroidal graphite iron castings) are as effective as figure 2 , It can be seen that the surface of the casting is smooth and clean.

Embodiment 3

[0046] Step 1: Weigh 53 kg of bauxite, 3 kg of quartz powder, 3.5 kg of mullite powder, 3.5 kg of pyrophyllite powder, 3.08 kg of sodium bentonite, 1.92 kg of expandable graphite, 0.44 kg of rosin, and low-viscosity polyvinyl alcohol 0.56 kg of butyral, 31 kg of alcohol;

[0047] Step 2: Put the above powder in the mixing tank, start the mixer, and mix for 5 minutes;

[0048] Step 3: Pour half of the alcohol, namely 15.5 kg, into the mixing tank slowly, add while stirring, and stir for 25 minutes after adding;

[0049] Step 4: Slowly add the remaining half of the alcohol, namely 15.5 kg, into the mixing tank, stir while adding, and continue to stir for 5 minutes after the addition, the material can be used, the paint can be brushed, sprayed, or flow coated. Dip coating.

[0050] Pouring castings (spheroidal graphite iron castings) are as effective as image 3 , It can be seen that the surface of the casting is smooth and clean.

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Abstract

The invention relates to a low-cost environmentally-friendly alcohol-based cast iron coating and a preparation method thereof. The low-cost environmentally-friendly alcohol-based cast iron coating comprises 46-55% of bauxite, 3-9% of quartz powders, 3-6% of mullite powders, 3-6% of pyrophyllite powders, 2.43-3.14% of sodium bentonite, 1.92-3.82% of expandable graphite, 0.38-0.65% of rosin, 0.38-0.58% of low viscosity polyvinyl butyral, and 27-31% of alcohol. According to the low-cost environmentally-friendly alcohol-based cast iron coating and the preparation method thereof, an easy-peeling coating is formed after pouring, the surface of the obtained casting is smooth and clean, and the dimensional accuracy is high; compared with traditional cast iron coating, the content of graphite is reduced from 100% to less than 4%, black pollution is reduced, obvious price advantage is obtained, raw material resources are extensive, cost performance is high, and the low-cost environmentally-friendly alcohol-based cast iron coating has broad application prospects.

Description

Technical field [0001] The invention belongs to the field of modeling materials for cast iron, and specifically relates to a novel environmentally friendly alcohol-based casting coating for improving the environment, improving the surface quality of castings, preventing or reducing casting defects, and reducing costs, and a preparation method thereof. Background technique [0002] Sand casting requires the use of coatings to prevent sand sticking on the surface of castings. Graphite coatings are often used for iron castings. Although the anti-sticking effect is very good, the site environment is very poor, causing serious black pollution, and the cost of flake graphite is also high. my country is rich in bauxite and quartz sand resources, and the cost is very low. Instead of graphite powder, it not only prevents black pollution, but also greatly reduces the cost. However, quartz powder has phase change at high temperature, is unstable, is used simply, and is easily wetted by molt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00
CPCB22C3/00
Inventor 张友寿蔡鹏夏露张茜黄晋
Owner HUBEI UNIV OF TECH
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