No-hardening flame-retardant transfer coating for magnesium alloy sand casting and preparation method thereof

A technology of sand casting and transfer coating, which is applied in the direction of casting molding equipment, metal processing equipment, coating, etc., to achieve the effect of increasing density, not easy to precipitate, and not easy to absorb moisture

Active Publication Date: 2020-02-21
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the defects in the prior art, the object of the present invention is to provide a self-hardening flame-retardant transfer coating for magnesium alloy sand casting and its preparation method, which can solve the problem that the existing coating for preparing magnesium alloy will react with the mold , and can obtain a transfer coating with high strength, a firm bond with the sand mold, and a smooth mold surface that does not crack during drying and pouring

Method used

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  • No-hardening flame-retardant transfer coating for magnesium alloy sand casting and preparation method thereof
  • No-hardening flame-retardant transfer coating for magnesium alloy sand casting and preparation method thereof
  • No-hardening flame-retardant transfer coating for magnesium alloy sand casting and preparation method thereof

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preparation example Construction

[0066] The following examples also provide a method for preparing a self-hardening flame-retardant transfer coating for magnesium alloy sand casting, comprising the following steps:

[0067] S1. Weigh each raw material component according to the mass percentage;

[0068] S2. Mix the suspending agent with 5-10 parts of water and grind it, then add defoamer and preservative to continue grinding to make liquid A;

[0069] S3. Grinding the flame retardant with 5-10 parts of water to make liquid B;

[0070] S4. Mix the refractory aggregate with coupling agent, binder and 5-10 parts of water and then grind it to make liquid C;

[0071] S5. Mix liquids A, B, and C, add the remaining amount of water, and continue grinding to obtain the no-hardening flame-retardant transfer coating for magnesium alloy sand casting.

[0072] The milling equipment includes a colloid mill or a ball mill.

Embodiment 1

[0074] This embodiment provides a method for preparing a self-hardening flame-retardant transfer coating for magnesium alloy sand casting, comprising the following steps:

[0075] raw material:

[0076] The refractory aggregate with the following ratio is 25 parts of corundum powder, 20 parts of magnesium oxide powder, and 5 parts of graphite powder; the suspending agent is 1 part of sodium bentonite, and 0.25 parts of attapulgite; 2 parts of urea-formaldehyde modified furan resin binder 0.5 part of coupling agent; 0.5 part of flame retardant (including boric acid 75wt%, ammonium fluoroborate 6wt%, sulfur 19wt%); 0.3 part of organic silicon defoamer; 0.01 part of sodium pentachlorophenate preservative;

[0077] Preparation:

[0078] 1. Mix the weighed suspending agent with 5-10 parts of water and grind it in a colloid mill or ball mill for 0.5 hour, then add defoamer and preservative to the liquid and continue grinding for 1 hour to make liquid A, and mix A good solution is ...

Embodiment 2

[0086] This embodiment provides a method for preparing a self-hardening flame-retardant transfer coating for magnesium alloy sand casting, comprising the following steps:

[0087] raw material:

[0088] The refractory aggregate with the following ratio is 15 parts of corundum powder, 15 parts of magnesium oxide powder, and 10 parts of graphite powder; the suspending agent is 1 part of sodium bentonite; 5 parts of urea-formaldehyde modified furan resin binder; 0.8 parts of coupling agent 1.5 parts of flame retardant (including 75wt% of boric acid, 6wt% of ammonium fluoroborate, 19wt% of sulfur); 1.5 parts of organic silicon defoamer; 0.03 part of sodium pentachlorophenate preservative; 70 parts of water.

[0089] Preparation:

[0090] 1. Mix the weighed suspending agent with 5-10 parts of water and grind it in a colloid mill or ball mill for 0.5 hour, then add defoamer and preservative to the liquid and continue grinding for 1 hour to make liquid A, and mix A good solution is s...

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Abstract

The invention relates to a self-hardening flame-retardant transfer coating for magnesium alloy sand casting and a preparation method of the self-hardening flame-retardant transfer coating. The self-hardening flame-retardant transfer coating is prepared from, by mass, 30-50 parts of heat-resisting aggregate, 0.5-2.5 parts of a suspending agent, 1-5 parts of a binder, 0.2-0.8 part of a coupling agent, 0.5-2.5 parts of a fire retardant agent, 0.1-1.5 parts of a defoaming agent, 0.01-0.03 part of preservative and 50-70 parts of water. The prepared coating has the good adhesion, coating performance and flame-retardant effect and is not prone to precipitating in the use process. In the casting process, a coating layer is not prone to cracking, the surface quality of a casting is good, dimensional precision is high, and the self-hardening flame-retardant transfer coating is suitable for the technical field of magnesium alloy casting.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a self-hardening flame-retardant transfer coating for magnesium alloy sand casting and a preparation method thereof. Background technique [0002] Magnesium alloy is the lightest metal material in practical application. It has the characteristics of low density, high specific strength and rigidity, good vibration damping, strong electromagnetic shielding ability and easy recycling. Known as the "21st Century Green Metal Material", industrially developed countries attach great importance to the research and development of magnesium alloys, and have widely used magnesium alloys in the fields of national defense, aerospace, automobiles and electronic information industries. With the improvement of energy saving and environmental protection standards in recent years, the annual growth rate of magnesium alloy products in the world has exceeded 20%. [0003] As we all know, the chemi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00
CPCB22C3/00
Inventor 李艳磊吴国华王迎新陈安涛刘文才
Owner SHANGHAI JIAOTONG UNIV
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