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Alcohol-based white coating for sand mold cast iron, and preparation method thereof

A cast iron, alcohol-based technology, used in casting equipment, coatings, molds, etc., can solve problems such as black powder polluting the environment, prevent sand sticking, and reduce production and use costs.

Inactive Publication Date: 2015-06-03
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an alcohol-based white paint for sand cast iron, which can not only prevent the sand and powder sticking defects of cast iron, improve the surface cleanliness of cast iron, but also solve the problem of current cast iron production. The problem of black powder pollution caused by graphite coatings

Method used

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  • Alcohol-based white coating for sand mold cast iron, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: Alcohol-based white paint for sand mold cast iron is made one

[0031] 1) Heat 6 parts by weight of water to 100°C, then add 3 parts by weight of sodium tripolyphosphate into the hot water and dissolve it into a transparent state, then add 8 parts by weight of calcium-based rectorite powder (its performance index is: Colloid value ≥ 60mL / 15g, expansion value ≥ 10mL / 3g), stir evenly, pour into the colloid mill and grind for 10min to make paste A.

[0032] 2) Mix 0.5 parts by weight of polyvinyl butyral (78-86% of aldehyde groups, 15-18% of hydroxyl groups, and 25-40 cps of viscosity) with 8 parts by weight of methanol, and dissolve it into a transparent state , and then add 4 parts by weight of thermosetting phenolic resin (free phenol ≤ 12%, solid content ≥ 80%, viscosity 600-1000s), stir well, and make sol B.

[0033] 3) Pour the paste A, sol B, and 22 parts by weight of methanol into the paint mixer, first stir evenly, and then add 50 parts by weight of...

Embodiment 2

[0035] Embodiment 2: Alcohol-based white paint is used for sand mold cast iron to make two

[0036] 1) Heat 8 parts by weight of water to 100°C, then add 4 parts by weight of sodium tripolyphosphate into the hot water and dissolve it into a transparent state, then add 10 parts by weight of calcium-based rectorite powder (its performance index is: Colloid value ≥ 60mL / 15g, expansion value ≥ 10mL / 3g), stir evenly, pour into the colloid mill and grind for 12min to make paste A.

[0037] 2) Mix 0.6 parts by weight of polyvinyl butyral (78-86% aldehyde group, 15-18% hydroxyl group, 25-40 cps viscosity) with 10 parts by weight methanol, and dissolve it into a transparent state , and then add 5 parts by weight of thermosetting phenolic resin (free phenol ≤ 12%, solid content ≥ 80%, viscosity 600-1000s), stir well, and make sol B.

[0038] 3) Pour the paste A, sol B, and 23 parts by weight of methanol into the paint mixer, first stir evenly, and then add 55 parts by weight of pyrophy...

Embodiment 3

[0040] Embodiment 3: Alcohol-based white paint is used for sand cast iron to make three

[0041] 1) Heat 10 parts by weight of water to 100°C, then add 5 parts by weight of sodium tripolyphosphate into the hot water and dissolve it into a transparent state, then add 12 parts by weight of calcium-based rectorite powder (its performance index is: Colloid value ≥ 60mL / 15g, expansion value ≥ 10mL / 3g), stir evenly, pour into the colloid mill and grind for 15min to make paste A.

[0042] 2) Mix 0.8 parts by weight of polyvinyl butyral (78-86% of aldehyde groups, 15-18% of hydroxyl groups, and 25-40 cps of viscosity) with 11 parts by weight of methanol, and dissolve it into a transparent state , and then add 6 parts by weight of thermosetting phenolic resin (free phenol ≤ 12%, solid content ≥ 80%, viscosity 600-1000s), stir evenly, and make sol B.

[0043] 3) Pour the paste A, sol B, and 25 parts by weight of methanol into the paint mixer, first stir evenly, and then add 60 parts by...

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Abstract

The invention discloses an alcohol-based white coating for a sand mold cast iron, and a preparation method thereof. The alcohol-based white coating for the sand mold cast iron comprises the following components by weight: 50-60 parts of pyrophyllite powder, 22-28 parts of calcined kaolin powder, 14-18 parts of wollastonite powder, 3-5 parts of potassium feldspar powder, 8-12 parts of calcium based rectorite powder, 3-5 parts of sodium tripolyphosphate, 4-6 parts of a thermosetting phenolic resin, 0.5-0.8 part of polyvinyl butyral, 6-10 parts of water and 60-70 parts of methanol. The alcohol-based white coating for the sand mold cast iron can replace an alcohol-based graphite coating for use in production of various sand mold cast iron members, can increase surface clearness of the cast iron members, and eliminates black pollutions to the environment caused by using the graphite coating in the production of the cast iron.

Description

technical field [0001] The invention belongs to the field of molding materials for cast iron, and relates to an alcohol-based white paint for sand cast iron and a preparation method thereof. Background technique [0002] In the production of sand mold iron castings, in order to obtain smooth iron castings, graphite paint or graphite-aluminosilicate composite light-color paint must be painted on the surface of the sand mold. Graphite has a very high melting point (>3000°C), and the graphite coating is not wetted by molten iron, which avoids the penetration of molten iron into the coating or the voids of the sand mold, and prevents sand sticking defects in iron castings. Previous studies have shown that in addition to graphite-based coatings, zircon powder coatings are used to produce iron castings, and they also have a better anti-sticking sand effect. Other aluminosilicate coatings, such as quartz powder coatings, corundum powder coatings, bauxite coatings, etc., c...

Claims

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Application Information

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IPC IPC(8): B22C3/00
Inventor 黄晋张友寿夏露李四年龙威
Owner HUBEI UNIV OF TECH