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A kind of high air permeability alcohol-based lost foam coating and preparation method thereof

A gas-permeable and lost-foam technology, which is applied in the preparation of high-permeability alcohol-based lost-foam coatings and in the field of high-permeability alcohol-based lost-foam coatings, can solve problems affecting casting performance and unsatisfactory gas permeability of lost-foam coatings. Low cost, good suspension stability, and simple preparation process

Inactive Publication Date: 2019-06-21
HUABAO (TIANJIN) NEW MATERIAL SCI & TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of highly gas-permeable alcohol-based lost foam coating, which solves the problem that the gas permeability of the lost foam coating in the prior art is not ideal and affects the performance of castings

Method used

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Examples

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Effect test

preparation example Construction

[0020] The preparation method of the high air permeability alcohol-based lost foam coating of the present invention is implemented according to the following steps:

[0021] Step 1. Weigh the raw materials

[0022] Weigh the following raw materials according to mass percentage: alcohol-based solvent (one or two combinations of methanol, ethanol, and isopropanol) 20% to 40%; 0.5% to 5% of polyvinyl formal and 0.5% to 5% of silica sol; 0.5% to 5% of organic montmorillonite; 0.05% to JFC 0.2%; polyurethane foam microbeads or expandable polymethyl methacrylate microbeads 0.1-1%, total 100%;

[0023] Step 2. Preparation of highly air-permeable alcohol-based lost foam coating

[0024] 2.1) According to the mass ratio of 1:1, mix and stir the organic montmorillonite weighed in step 1 and the alcohol-based solvent for 30-40 minutes to obtain mixture A, seal and stand for 24 hours before use;

[0025] 2.2) According to the mass ratio of 1:1, mix and stir the polyvinyl formal and sil...

Embodiment 1

[0030] Step 1. Weigh the following raw materials according to mass percentage: 25% ethanol; 60% pearl sand; 5% polyvinyl formal and 5% silica sol; 4.8% organic montmorillonite; 0.1% JFC; polyurethane foam beads Granules 0.1%, total 100%.

[0031] Among them, the refractory aggregate pearl sand particle size is about 200 mesh; the polyurethane foam micro-bead particle size is about 0.05mm.

[0032] Step 2. Preparation of highly air-permeable alcohol-based lost foam coating

[0033] 2.1) According to the mass ratio of 1:1, the organic montmorillonite weighed in step 1 and the alcohol-based solvent were mixed and stirred for 30 minutes to obtain mixture A, which was sealed and left for 24 hours for later use;

[0034] 2.2) According to the mass ratio of 1:1, mix and stir the polyvinyl formal and silica sol weighed in step 1 with an alcohol-based solvent for 20 minutes to obtain a mixture B, which is sealed and stored for later use;

[0035] 2.3) Pour the remaining alcohol-based...

Embodiment 2

[0039] Step 1. Weigh the following raw materials according to mass percentage: methanol 35%; zircon powder 54%; polyvinyl formal 3.5% and silica sol 3.3%; organic montmorillonite 3.5%; JFC 0.2%; foamable Polymethyl methacrylate microbeads 0.5%, total 100%.

[0040] Among them, the particle size of refractory aggregate zircon powder is about 250 mesh; the particle size of foamable polymethyl methacrylate microbeads is about 0.2mm.

[0041] Step 2. Preparation of highly air-permeable alcohol-based lost foam coating

[0042] 2.1) According to the mass ratio of 1:1, the organic montmorillonite weighed in step 1 and the alcohol-based solvent were mixed and stirred for 35 minutes to obtain mixture A, which was sealed and left for 24 hours for later use;

[0043] 2.2) According to the mass ratio of 1:1, mix and stir the polyvinyl formal and silica sol weighed in step 1 with an alcohol-based solvent for 25 minutes to obtain a mixture B, which is sealed and stored for later use;

[0...

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Abstract

The invention discloses high-breathability alcohol-based evaporative pattern coating. The high-breathability alcohol-based evaporative pattern coating comprises the following raw materials in percent by mass: 20-40% of an alcohol-based solvent, 40-60% of refractory aggregates, 0.5-5% of polyvinyl formal, 0.5-5% of silica sol, 0.5-5% of a suspending agent, 0.05-0.2% of a surfactant and 0.1-1% of an auxiliary agent, altogether 100%. The invention further discloses a preparation method of the high-breathability alcohol-based evaporative pattern coating. The high-breathability alcohol-based evaporative pattern coating is prepared by mixing the weighed raw materials according to a certain adding sequence and uniformly stirring the raw materials. The high-breathability alcohol-based evaporative pattern coating can achieve a rapid self-drying effect in the case of no drying; when the added polyurethane foam microbeads or foamable polymethyl methacrylate microbeads encounter high temperature in the casting process, liquid metal is gasified and small holes are formed in a coating layer, so that the breathability of the high-breathability alcohol-based evaporative pattern coating is greatly improved; the high-breathability alcohol-based evaporative pattern coating is good in adhesion and sand-sticking resistance.

Description

technical field [0001] The invention belongs to the technical field of lost-foam coatings, and relates to a highly air-permeable alcohol-based lost-foam coating, and also relates to a preparation method of the highly-permeable alcohol-based lost-foam coating. Background technique [0002] Lost foam casting technology is an emerging casting process in the foundry industry. It has the characteristics of flexible design, short production cycle, high casting precision and simple operation. It is praised as "green casting in the 21st century" at home and abroad. With the development and application of this technology and the limitation of higher and higher production technology requirements, the lost foam casting technology faces many problems. Among them, the performance of coating is one of the key factors affecting the quality of castings. Appropriate coating can greatly improve the rigidity of the pattern; it can act as an isolation medium between liquid metal and dry sand, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C3/00
CPCB22C3/00
Inventor 屈银虎祁志旭成小乐时晶晶刘晓妮祁攀虎周思君
Owner HUABAO (TIANJIN) NEW MATERIAL SCI & TECH DEV CO LTD
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