Lost foam coating and preparation method thereof

A technology of lost foam and coating, which is applied in the direction of coating, manufacturing tools, casting molding equipment, etc. It can solve the problems of low strength at room temperature, low strength at high temperature, and collapse of casting cavity, and achieve good leveling, smooth surface, and Uniform coating effect

Active Publication Date: 2013-01-16
苏州科博尔机床集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the quality of the current coatings still has shortcomings in various aspects, such as low strength at room temperature, and local deformation often occurs due to the extrusion of molding sand during molding, so that the poured castings become waste products
Or the high temperature strength is low, the casting cavity collapses or the paint peels off during casting, which will also make the casting scrap
In addition, there is no suitable high-temperature air permeability. Too high air permeability will increase the probability of cavity collapse, and too low air permeability will cause defects such as pores and wrinkled skin in castings.

Method used

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  • Lost foam coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Raw material

[0020] 35 parts of 150 mesh mullite powder, 15 parts of 150 mesh quartz powder, 30 parts of 200 mesh bauxite, 2 parts of bentonite, 2.5 parts of silica sol, 5 parts of polyvinyl acetate, 0.5 part of sodium carboxymethyl cellulose, alkylbenzene 0.3 parts of sodium sulfonate, 0.3 parts of sodium sulfate, 0.3 parts of n-octanol, 0.3 parts of fatty alcohol polyoxyethylene ether, and 110 parts of water.

[0021] b) Preparation:

[0022] 1) Add 2 parts of bentonite to 20 parts of water, stir at high speed for 6 hours to form bentonite slurry;

[0023] 2) Mix 35 parts of mullite powder, 15 parts of quartz powder and 30 parts of bauxite in the grinding equipment to make refractory powder base material;

[0024] 3) Then add 70 parts of water to the base material to make the base material wet and stir; at the same time, add 2.5 parts of silica sol, 5 parts of polyvinyl acetate, 0.5 parts of sodium carboxymethyl cellulose, and 0.3 parts of sodium alkylbenzene s...

Embodiment 2

[0027] 1) Raw material

[0028] 30 parts of 200 mesh mullite powder, 20 parts of 100 mesh quartz powder, 30 parts of 320 mesh bauxite, 1 part of bentonite, 3 parts of silica sol, 3 parts of polyvinyl acetate, 0.7 parts of sodium carboxymethyl cellulose, alkylbenzene 0.1 part of sodium sulfonate, 0.5 part of sodium sulfate, 0.2 part of n-octanol, 0.3 part of fatty alcohol polyoxyethylene ether, and 110 parts of water.

[0029] b) Preparation:

[0030] 1) Add 1 part of bentonite to 20 parts of water, stir at high speed for 6 hours to form bentonite slurry;

[0031] 2) Mix 30 parts of mullite powder, 20 parts of quartz powder and 30 parts of bauxite in the grinding equipment to make refractory powder base material;

[0032] 3) Then add 70 parts of water to the base material to make the base material wet and stir; at the same time, add 3 parts of silica sol, 3 parts of polyvinyl acetate, 0.7 parts of sodium carboxymethyl cellulose, and 0.1 parts of sodium alkylbenzene sulfonate ...

Embodiment 3

[0035] 1) Raw material

[0036] 40 parts of 180 mesh mullite powder, 15 parts of 150 mesh quartz powder, 25 parts of 200 mesh bauxite, 3 parts of bentonite, 2 parts of silica sol, 5 parts of polyvinyl acetate, 0.3 parts of sodium carboxymethyl cellulose, alkylbenzene 0.2 part of sodium sulfonate, 0.5 part of sodium sulfate, 0.1 part of n-octanol, 0.3 part of fatty alcohol polyoxyethylene ether, and 110 parts of water.

[0037] b) Preparation:

[0038] 1) Add 3 parts of bentonite to 20 parts of water, stir at high speed for 6 hours to form bentonite slurry;

[0039] 2) 40 parts of mullite powder, 15 parts of quartz powder, and 25 parts of bauxite are stirred evenly in the grinding equipment to make refractory powder base material;

[0040] 3) Then add 70 parts of water to the base material to make the base material wet and stir; at the same time, add 2 parts of silica sol, 5 parts of polyvinyl acetate, 0.3 parts of sodium carboxymethyl cellulose, and 0.2 parts of sodium alkyl...

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PUM

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Abstract

The invention relates to a lost foam coating which comprises the following components in part by weight: 30-40 parts of mullite powder, 10-20 parts of quartz powder, 25-35 parts of bauxite, 1-3 parts of bentonite, 2-3 parts of silica sol, 3-7 parts of polyvinyl acetate, 0.3-0.7 part of sodium carboxymethyl cellulose, 0.1-0.5 part of sodium alkyl benzene sulfonate,0.1-0.5 part of sodium sulfate, 0.1-0.5 part of n-caprylic alcohol, 0.1-0.5 part of fatty alcohol polyoxyethylene ether, and 110 parts of water. The invention further discloses a preparation method of the coating. The coating prepared according to the invention has the advantages of good suspension property, high strength, uniformity in coating, good leveling property, finish surface, no bubble, no crack and the like; the viscosity variation of the coating is determined according to the needs of a user; different coating thicknesses can be realized with different viscosities; and the coating is high in strength an has no defects of holes and crack after being dried.

Description

technical field [0001] The invention relates to the field of casting, in particular to the technical field of lost foam casting. Background technique [0002] Lost foam casting (also known as solid casting) is to bond and combine foam models similar in size and shape to castings to form a model cluster. After brushing refractory paint and drying, it is buried in dry quartz sand for vibration molding, and poured under negative pressure. , the model is vaporized, the liquid metal occupies the position of the model, solidified and cooled to form a new casting method of castings. [0003] Compared with traditional casting technology, lost foam casting has the following characteristics: 1. Good casting quality and low cost; 2. Unlimited material and suitable size; 3. High dimensional accuracy, smooth surface, reducing cleaning workload; 4. Internal The defects are greatly reduced and the organization is dense; 5. It can realize large-scale and mass production, which can greatly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00B22C9/04
Inventor 陈立国
Owner 苏州科博尔机床集团有限公司
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