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Pyrophillite lost foam casting coating and preparation method thereof

A technology of lost foam casting and casting coating, which is applied to casting molding equipment, coatings, casting molds, etc. It can solve the problems of no details, no introduction of coating ratio and preparation process, etc., and achieve simple preparation process, good suspending property and so on. The effect of thixotropy and good air permeability

Inactive Publication Date: 2009-06-03
HAIAN HENGYE SILK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] It is also reported in the literature that pyrophyllite powder can produce various high-temperature and corrosion-resistant coatings and special coatings for metallurgical casting in the coatings industry (Yao Wenjun, Zhang Peiping, Li Shushu, Ma Liyan, Su Ke. Research status of pyrophyllite mineral resources and their application development , World Geology, 2007, 26(1): 124-129; Liu Ping. Talking about the development and utilization of pyrophyllite, IM&P Chemical Minerals and Processing, 2004, (12): 38), but only mentioned in relevant literature, There is no detailed information available, let alone a specific introduction to the coating ratio and preparation process

Method used

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Examples

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preparation example Construction

[0037] The preparation method of the casting coating of the present invention is carried out according to the following steps:

[0038] Step 1. Take 90%-95.8% of pyrophyllite refractory powder, 0.2%-0.7% of sodium carboxymethyl cellulose, 1.9%-4.4% of bentonite, 1.9%-5.3% of water glass, and polyvinyl alkyl according to mass percentage. Alcohol ether 0.1%~0.18% and n-octanol 0.05%~0.1%; the pyrophyllite refractory powder is pyrophyllite or a mixture composed of 50%~90% pyrophyllite and 10%~50% other refractory materials according to mass percentage, others The refractory material is selected from one or a combination of two or more of quartz powder, zircon powder, corundum powder, bauxite powder or magnesia powder.

[0039] Step 2. According to the mass ratio of 1:30, mix the sodium carboxymethyl cellulose obtained in step 1 with water, stir evenly, and let stand for 70 to 75 hours to prepare an aqueous solution of sodium carboxymethyl cellulose;

[0040] According to the mass ratio...

Embodiment 1

[0046] According to mass percentage, take 90% pyrophyllite, 0.7% sodium carboxymethyl cellulose, 4.4% bentonite, 4.62% water glass, 0.18% polyvinyl alcohol ether and 0.1% n-octanol;

[0047] According to the mass ratio of 1:30, mix sodium carboxymethyl cellulose with water, stir evenly, and let stand for 70 hours to prepare sodium carboxymethyl cellulose aqueous solution;

[0048] According to the mass ratio of 1:5, mix the bentonite with water, stir evenly, and let stand for 70 hours to prepare a bentonite-water mixture;

[0049] Mix the pyrophyllite, water glass, sodium carboxymethyl cellulose aqueous solution and bentonite water mixture evenly, and add the mixed solution and water to the high-speed disperser according to the mass ratio of 10:1, and disperse at high speed. Hours to produce mixed coatings;

[0050] Polyvinylalkane and n-octanol are sequentially added to the prepared mixed coating, stirred for 30 minutes, and dispersed uniformly, to prepare a pyrophyllite lost foa...

Embodiment 2

[0052] According to mass percentages, take 95.8% of pyrophyllite, 0.2% of sodium carboxymethyl cellulose, 1.95% of bentonite, 1.9% of water glass, 0.1% of polyvinyl alcohol ether and 0.05% of n-octanol;

[0053] According to the mass ratio of 1:30, mix sodium carboxymethyl cellulose with water, stir evenly, and let stand for 75 hours to prepare sodium carboxymethyl cellulose aqueous solution;

[0054] According to the mass ratio of 1:5, mix the bentonite with water, stir evenly, and let stand for 75 hours to prepare a bentonite water mixture;

[0055] Mix the pyrophyllite, water glass, sodium carboxymethyl cellulose aqueous solution and bentonite water mixture uniformly, and prepare the mixed solution. According to the mass ratio of 10:1, add the mixed solution and water to the high-speed disperser, and disperse at high speed. Hours to produce mixed coatings;

[0056] Add polyvinylalkane and n-octanol to the mixed paint in sequence, stir for 40 minutes, and disperse evenly, to pre...

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Abstract

The invention discloses a pyrophillite lost foam casting coating and a preparation method thereof. The coating comprises the following components by the mass percentage: 90% to 95.8% of pyrophillite refractory powder, 0.2% to 0.7% of sodium carboxymethyl cellulose, 1.9% to 4.4% of swell soil, 1.9% to 5.3% of soluble glass, 0.1% to 0.18% of polyethylene alkyl polyol ether, and 0.05% to 0.1% of N-octanol, and the mass percentage of the components is 100% in total, wherein, pyrophillite refractory powder is pyrophillite or mixture of pyrophillite and other refractory materials. The invention has the advantages that the pyrophillite lost foam casting coating has favorable suspension property and thixotropy, as well as excellent ventilation property and relatively high surface strength; and the preparation technology is simple, the operation is convenient, the raw material is abundant and the production cost is low. The invention is mainly used for producing refractory material on the surface of foam plastic mould of lost foam pieces.

Description

Technical field [0001] The invention belongs to the technical field of metal liquid forming, and specifically relates to a pyrophyllite lost foam casting coating. The invention also relates to a preparation method of the casting coating. Background technique [0002] Lost foam casting is known as "green casting technology" and "casting technology of the 21st century" with its unique advantages. Since its application in my country in the 1960s, after decades of continuous development, the application field of lost foam casting has been continuously expanded, and good economic and social benefits have been obtained. [0003] In lost foam casting, coating is one of the key technologies. Different from ordinary sand casting, the coating of lost foam casting is spread on the surface of the foam mold instead of being spread on the mold or sand core. In view of the difference between lost foam casting and ordinary sand casting, the lost foam casting coating should not only meet the requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00
Inventor 张忠明徐春杰郭学锋
Owner HAIAN HENGYE SILK
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