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Flame-retarding paint for casting Mg-alloy and its preparing process

A technology of lost foam casting and flame retardant coating, applied in the field of magnesium alloy lost foam casting coating, magnesium alloy lost foam casting coating and its preparation, which can solve the problems affecting the mechanical properties of castings, surface defects of castings, pores of castings, etc. Spreadability, strong thixotropy, effect of reducing porosity

Inactive Publication Date: 2002-11-27
SHANGHAI AIERSI LIGHT ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the pouring process, the foam plastic pattern will be pyrolyzed into liquid and gaseous products. These pyrolysis products must be discharged from the cavity through the coating, otherwise the casting will have surface defects and may be involved in the magnesium liquid, causing serious pores in the casting. , seriously affect the mechanical properties of castings
At present, there is no report on special coatings for magnesium alloy lost foam casting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Magnesium alloy lost foam casting flame retardant coating composition (mass percentage): magnesia powder 30%, pearl powder 30%, mica powder 25%, silica sol 4%, white latex 4%, polyacrylamide 0.8%, carboxymethyl fiber Sodium 0.7%, palygorskite clay 5%, sodium alkylsulfonate 0.2%, boric acid 0.3%.

[0011] Mix palygorskite clay with 30 parts of water and grind it in a colloid mill or ball mill for 3 hours to make nail polish. Sodium carboxymethyl cellulose is mixed with 20 parts of water and stirred evenly in a blender to make liquid B. Mix polyacrylamide with 20 parts of hot water to make liquid acrylic. Then put magnesia powder, pearl powder, mica powder, sodium alkylsulfonate and boric acid into a colloid mill or ball mill, add liquid A, liquid B, liquid C, silica sol, and white latex to grind for 1 hour, and then Add appropriate amount of water to the mixer and stir for 2 hours to get the magnesium alloy lost foam casting flame retardant coating.

[0012] When in u...

Embodiment 2

[0014] Magnesium alloy lost foam casting flame retardant coating composition (mass percentage): magnesia powder 45%, pearl powder 20%, mica powder 20%, silica sol 5%, white latex 3%, polyacrylamide 0.5%, carboxymethyl fiber Sodium 0.3%, attapulgite clay 5%, sodium alkylsulfonate 0.4%, sulfur 0.8%.

[0015] Mix the attapulgite clay with 20 parts of water and grind it in a colloid mill or ball mill for 4 hours to make nail polish. Mix sodium carboxymethyl cellulose with 20 parts of water to make solution B. Mix polyacrylamide with 20 parts of hot water to make liquid acrylic. Then put magnesia powder, pearl powder, mica powder, sodium alkylsulfonate and sulfur into a colloid mill or ball mill, add liquid A, liquid B, liquid C, silica sol, and white latex to grind for 2 hours, and then Add appropriate amount of water to the mixer and stir for 1 hour to get the magnesium alloy lost foam casting flame retardant coating.

[0016] When in use, apply a 0.8mm-thick paint on the surf...

Embodiment 3

[0017] Magnesium alloy lost foam casting flame retardant coating composition (mass percentage): magnesia powder 40%, pearl powder 20%, mica powder 25%, silica sol 9%, white latex 2%, polyacrylamide 0.6%, carboxymethyl fiber Sodium 0.2%, palygorskite clay 2%, NH 4 BF 4 0.6%, sulfur 0.6%.

[0018] Mix palygorskite clay with 15 parts of water and grind it in a colloid mill or ball mill for 2 hours to make nail polish. Mix sodium carboxymethyl cellulose with 20 parts of water to make solution B. Mix polyacrylamide with 20 parts of hot water to make liquid acrylic. Then magnesia powder, pearl powder, mica powder, NH 4 BF 4 Put sulfur and sulfur into a colloid mill or ball mill, add liquid A, liquid B, liquid C, silica sol, and white latex to grind for 3 hours, and then add an appropriate amount of water to the mixer and stir for 1.5 hours to obtain the magnesium alloy lost foam Cast flame retardant coatings.

[0019] When in use, apply a 0.6mm-thick coating on the surface of...

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Abstract

A fire-retarding paint for casting Mg-alloy with lost mould is prepared from magnesia sand powder, perlite powder, mica powder silica sol, white emulsoid, polyacrylamide, carboxymethylcellulose sodium, adsorbent and flame-retarding agent through preparing solution from adsorbent, carboxymethylcellulose sodium, polyacrylamide and water, and mixing with others. It can make the Mg-alloy casting havesmooth surface.

Description

Technical field: [0001] The invention relates to a magnesium alloy lost foam casting coating, especially a magnesium alloy lost foam casting coating with strong flame retardancy, adsorption and coating properties and a preparation method thereof, belonging to metal materials and metallurgical technologies field. Background technique: [0002] Due to the active chemical properties of magnesium, liquid magnesium is very easy to react with oxygen, nitrogen in the atmosphere, water and silicon dioxide in the mold. The surface films such as magnesium oxide and magnesium nitride produced as a result of the reaction have low density coefficients and poor thermal conductivity. The large amount of heat released by the reaction cannot be dissipated quickly, resulting in a rapid rise in temperature on the reaction interface, which in turn accelerates the magnesium The oxidation of magnesium intensifies the combustion of magnesium. As a result, holes or oxide wrinkles appear on the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00B22C9/04B22D21/04
Inventor 吴国华丁文江
Owner SHANGHAI AIERSI LIGHT ALLOY
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