High-foaming expendable casting material and preparation method thereof

A technology of disappearance casting and high foaming, which is applied in the field of mold casting, which can solve the problems of harsh foaming conditions and obstacles to application, and achieve the effects of improving foaming performance, reducing environmental pollution, and improving the workshop environment

Inactive Publication Date: 2014-05-28
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this material is theoretically a material suitable for lost foam casting, the harsh foaming conditions of this material hinder its application in industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The preparation process of the above-mentioned highly foamable lost casting mold material is as follows:

[0027] Prepare bead material by mixing deionized water, styrene monomer, methyl methacrylate monomer, methacrylic acid monomer, dispersant, and initiator for suspension polymerization;

[0028] The prepared bead material is washed, dried, sieved and stored to obtain a pre-foamed polymer material;

[0029] Put the pre-foaming material, foaming agent, plasticizer, surface coating agent and antistatic agent in the autoclave, set the pressure at 0.65MPa to foam for 6-10 hours, keep warm for 10-15 hours, cool down, discharge, Washing, high foaming disappears molding material.

[0030] The implementation effect shows that the foaming performance of the lost casting mold material prepared by the invention is high, and the ash content after burning is less than 1%. The material has smooth surface, good rigidity and high strength. The appearance and properties meet the r...

Embodiment 1

[0032] Add 100 parts of distilled water, 0.4 parts of initiator dibenzoyl peroxide, 0.5 parts of dispersant, 4 parts of styrene (ST) monomer, 12 parts of formaldehyde into a 250ml three-necked flask equipped with a stirrer and condensing reflux device. Bead materials were prepared by suspension polymerization of methyl acrylate (MMA) monomer and 4 parts of functional monomer methacrylic acid (MAA). Wherein the dispersant is a mixture of mass fraction 60% polyvinyl alcohol and 40% basic magnesium carbonate.

[0033] After the reaction is completed, the material is cooled, washed with dilute hydrochloric acid, filtered and dried to obtain a pre-foamed polymer material.

[0034] Add the obtained pre-foamed polymer material, 1.5 parts of foaming agent, 0.01 part of plasticizer, 0.3 part of surface coating agent and 0.01 part of antistatic agent into the foaming device. In an autoclave, foam for 6 hours at a pressure of 0.65 MPa, keep warm for 10 hours, cool down, discharge, and w...

Embodiment 2

[0037] Add 140 parts of distilled water, 1 part of initiator dibenzoyl peroxide, 2 parts of dispersant, 6 parts of styrene (ST) monomer, 8 parts of formaldehyde into a 250ml three-necked flask equipped with a stirrer and a condensing reflux device The bead material was prepared by suspension polymerization of methyl acrylate (MMA) monomer and 6 parts of functional monomer methacrylic acid (MAA). Wherein the dispersant is a mixture of mass fraction 80% polyvinyl alcohol and 20% basic magnesium carbonate.

[0038] After the reaction is completed, the material is cooled, washed with dilute hydrochloric acid, filtered and dried to obtain a pre-foamed polymer material.

[0039] Add the obtained pre-foamed polymer material, 2.5 parts of foaming agent, 1 part of plasticizer, 1 part of surface coating agent and 1 part of antistatic agent into the foaming device. In an autoclave, foam for 6 hours at a pressure of 0.65 MPa, keep warm for 10 hours, cool down, discharge, and wash to obta...

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Abstract

The invention discloses a high-foaming polystyrene-methacrylic acid-naethylmethacrylate gasified expendable casting material and a preparation method thereof. A functional methacrylic acid monomer is added in the preparation process of the styrene-naethylmethacrylate expendable casting material. The process is as follows: deionized water, a styrene monomer, a methacrylic acid monomer, the naethylmethacrylate monomer, a dispersant and an initiator are mixed, subjected to a suspension polymerization reaction, and prepared into a particle material; the prepared particle material is washed, dried, sieved and stored to obtain a pre-foaming material; the pre-foaming material, a foaming agent, a plasticizer, a surface coating agent and an antistat are placed in a high-pressure kettle to foam and is subjected to temperature keeping, cooling, discharging and washing, as a result, the high-foaming expendable casting material is obtained. According to the high-foaming expendable casting material and the preparation method thereof, the volume of a material in unit mass is greatly increased, the economical benefit of the material is improved, the generation of a cracked gas is reduced, the improvement of an workshop environment is facilitated, and meanwhile pollution to the environment is lowered.

Description

technical field [0001] The invention belongs to the field of mold casting, and in particular relates to a high-foaming performance polystyrene-methacrylic acid-methyl methacrylate gasification and disappearing casting mold material and a preparation method thereof. Background technique [0002] Lost Foam Casting (EPC for short) is a new technology with nearly no margin, precise operation and easy realization of clean production. It is also a comprehensive multi-science casting new technology system engineering integrating plastics, chemical industry, machinery and casting. [0003] In the early 1980s, EPC technology began to be widely used in industrial production, especially in the automotive industry to develop rapidly. At the same time, the production practice at home and abroad has shown the unique superiority of this technology. EPC technology is known as "new technology in the 21st century" and "green engineering in casting". [0004] Polystyrene is the earliest and m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/12C08J9/14C08F220/14C08F212/08C08F220/06C08F2/20
Inventor 刘生鹏胡仙林许莉莉
Owner WUHAN INSTITUTE OF TECHNOLOGY
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