Low-cost environmentally-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: 2018-06-12
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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  • Low-cost environmentally-friendly alcohol-based cast iron coating and preparation method thereof
  • Low-cost environmentally-friendly alcohol-based cast iron coating and preparation method thereof
  • Low-cost environmentally-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 Butyral 0.47 kg, alcohol 27 kg;

[0035] The second step: put the above powder in the mixing bucket, start the mixer, and stir for 5 minutes;

[0036] Step 3: Slowly pour half of the alcohol, namely 13.5 kg, into the mixing tank, 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, stir while adding, and continue stirring for 5 minutes after adding, the material can be used after discharge, the paint can be brushed, sprayed, or flow-coated. Dip coating.

[0038] Pouring casting effect such as figure 1 , it can be seen that the surface of the casting is smooth.

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 Butyral 0.38 kg, alcohol 30 kg;

[0041] The second step: put the above powder in the mixing bucket, start the mixer, and stir for 5 minutes;

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

[0043] Step 4: Slowly add the remaining half of the alcohol, namely 15kg, into the mixing tank, stir while adding, and continue stirring for 5 minutes after adding, the material can be used after discharge, the paint can be brushed, sprayed, or flow-coated. Dip coating.

[0044] The effect of pouring castings (ductile iron castings) is as follows figure 2 , it can be seen that the surface of the casting is smooth.

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 Butyral 0.56 kg, alcohol 31 kg;

[0047] The second step: put the above powder in the mixing bucket, start the mixer, and stir for 5 minutes;

[0048] Step 3: Slowly pour half of the alcohol, namely 15.5 kg, into the mixing tank, 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 stirring for 5 minutes after adding, the material can be used after discharge. The paint can be brushed, sprayed, or flow coated. Dip coating.

[0050] The effect of pouring castings (ductile iron castings) is as follows image 3 , it can be seen that the surface of the casting is smooth.

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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 molding materials for cast iron, and specifically relates to a novel environment-friendly alcohol-based casting paint and a preparation method thereof for improving the environment, improving the surface quality of castings, preventing or reducing casting defects, and reducing costs. Background technique [0002] Sand casting requires the use of coatings to prevent sand sticking on the surface of castings. Graphite coatings are often used on iron castings. Although the effect of anti-sticking sand is very good, the site environment is very poor, causing serious black pollution, and the cost of flake graphite is also high. Our country is rich in bauxite and quartz sand resources, and the cost is very low. Using them instead of graphite powder not only prevents black pollution, but also greatly reduces the cost. However, quartz powder has a phase change at high temperature, is unstable, and is easy to be wetted by mo...

Claims

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Application Information

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Patent Type & Authority Applications(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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