CN104889315A - Water-based coating for lost foam casting and preparation method of coating - Google Patents
Water-based coating for lost foam casting and preparation method of coating Download PDFInfo
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- CN104889315A CN104889315A CN201510340096.0A CN201510340096A CN104889315A CN 104889315 A CN104889315 A CN 104889315A CN 201510340096 A CN201510340096 A CN 201510340096A CN 104889315 A CN104889315 A CN 104889315A
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Abstract
The invention aims to provide a water-based coating for lost foam casting and a preparation method of the coating and belongs to the technical field of lost foam casting production. The prepared coating is high in suspension stability and sand adhering resistance, low in gas-forming property, good in air-tightness, easy to store and low in cost. According to the technical scheme, the preparation method of the water-based coating for lost foam casting comprises steps as follows: 1-2 parts of carboxymethylcellulose and 3-4 parts of lithium-based bentonite are mixed, water is added, the mixture is stirred until no cake exists, a colloidal liquid is prepared after the mixture is soaked for 24-30 h, then 3-4 parts of a polyvinyl acetate emulsion and water are added, the mixture is poured into a mixing machine for stirring for 1 h, 90-105 parts of refractory aggregate and 3-4 parts of wood ash are added to the mixing machine, continuous stirring is performed for 3-5 h, finally, a wetting agent and a defoaming agent are added, the mixture is stirred for 1-2 h, water is added, and continuous stirring is performed until the uniform emulsion coating with the Baume degree ranging from 1.7 to 1.8 is obtained.
Description
Technical field
A kind of Water-based coating for lost foam casting of the present invention and preparation method thereof, belongs to evaporative pattern castings production technical field, particularly the preparation method of Water-based coating for lost foam casting.
Background technology
Traditional cast paint just plays stop buffer action in the middle of foundry goods and casting mold, reach Sand sticking-resistant object, but because poor adhesive force, low, the fire-resistant difference of intensity, gas forming amount are large under conventional cast coating high temperature, foundry goods is easily caused to produce the defect such as scab, sand holes, pore, carbon slag, or coating and high temperature metal liquid generation chemical reaction.Owing to being limited to the factor of raw material and facility environment in production, cause casting defect frequent, production cost is remained high.
Summary of the invention
The present invention overcomes the deficiency that prior art exists, technical problem to be solved is to provide a kind of Water-based coating for lost foam casting and preparation method thereof, the coating suspension stability made and anti-stick grittiness are strong, and gas-forming property is low and air-tightness good, are easy to storage and with low cost.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of Water-based coating for lost foam casting, comprises the raw material of following parts by weight:
Carboxymethyl cellulose 1-2 part;
Lithium bentonite 3-4 part;
Polyvinyl acetate emulsion 3-4 part;
Dry wood ash 3-4 part;
Refractory aggregate 95-105 part;
Wetting agent 0.02-0.03 part;
Defoamer 0.02-0.03 part;
Water 600-700 part;
The Baume degrees of described coating is 1.7-1.8.
Described refractory aggregate comprises silica flour 90-100 part, mica powder 1-4 part and pearl essence 1-3 part.
Described silica flour is 200 order particles and dioxide-containing silica is greater than 99%, and mica powder is 325 order particles.
Coke ash 1-2 part and 1 part, diatomite is also added with in described coating.
Described lithium bentonite is 325 order particles.
Described oven dry wood ash is the wood ash of broad-leaved arbor.
Serviceability mainly hot property and the gas permeability of coating for dispellable mould casting, these two determine its effect in casting process.Then need measure and control its viscosity, solids content, gas permeability, pH value etc. in practical operation.Only guarantee that the stable performance of coating is consistent, just can ensure the quality of lost foam casting product.
Carboxymethyl cellulose is nonpoisonous and tasteless white flock, and stable performance is soluble in water, discoloring temperature 227 DEG C, carbonization temperature 252 DEG C;
Lithium bentonite, as thickener, suspension stabilizer, makes the dope viscosity made increase and forms solvation film and dimensional network structure in base-material particle face to support and to stop particles sink;
Polyvinyl acetate emulsion is also white glue with vinyl, is a kind of thermoplastic adhesives, aqueous, environmental protective glue, and adhesive linkage has good toughness and durability and not easily aging;
Wood ash, coke ash and diatomite, fine and smooth, loose, light weight, porous, water imbibition and permeability are strong, all can increase the gas permeability of coating.
The preparation method of Water-based coating for lost foam casting, in accordance with the following steps:
The first step, by carboxymethyl cellulose, lithium bentonite mixing, adds water and is stirred to without block, soak 24-30 hour, make colloidal fluid;
Second step, adds polyvinyl acetate emulsion and water in the colloidal fluid that the first step is made, and pours in grout mixer and stirs 1 hour;
3rd step, after second step has stirred, adds refractory aggregate and wood ash in grout mixer, continues to stir 3-5 hour;
4th step, after the 3rd step has stirred, has added wetting agent and defoamer, then has stirred 1-2 hour in grout mixer;
5th step, after the 4th step has stirred, has added water in grout mixer, continues to be stirred to obtain the homogeneous latex emulsion shape coating that Baume degrees is 1.7-1.8;
Described first and second, the total amount of water used is 600-700 part in five steps.
The adding material of described 3rd step also comprises coke ash and diatomite.
The beneficial effect that the present invention is compared with the existing technology had is: the present invention adopts carboxymethyl cellulose and lithium bentonite to be mixed and made into the colloidal fluid of stable performance, and add polyvinyl acetate emulsion enhancing caking property, add refractory aggregate again and make coating, the coating suspension stability made and anti-stick grittiness strong, gas-forming property is low and air-tightness good, be easy to storage and with low cost; Containing the silica flour that a large amount of 200 order particles and silica content are greater than 99% in the refractory aggregate adopted, coating is had and enough anti-ly swashs Thermal cracking and high-temperature stability; In manufacturing process, add wood ash, coke ash and diatomite, fine and smooth, loose, light weight, porous, water imbibition and permeability are strong, all can increase the gas permeability of coating.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment one
A kind of Water-based coating for lost foam casting of the present invention, comprises the raw material of following parts by weight:
Carboxymethyl cellulose 1 part;
Lithium bentonite 3 parts;
Polyvinyl acetate emulsion 3 parts;
Dry wood ash 3 parts;
Silica flour 90 parts;
Mica powder 3 parts;
Pearl essence 2 parts;
Wetting agent 0.02 part;
Defoamer 0.02 part;
600 parts, water;
The Baume degrees of described coating is 1.7-1.8.
Described silica flour is 200 order particles and dioxide-containing silica is greater than 99%, and mica powder is 325 order particles.
Described lithium bentonite is 325 order particles.
The preparation method of Water-based coating for lost foam casting, in accordance with the following steps:
The first step, by carboxymethyl cellulose, lithium bentonite mixing, adds water and is stirred to without block, soak 24 hours, make colloidal fluid;
Second step, adds polyvinyl acetate emulsion and water in the colloidal fluid that the first step is made, and pours in grout mixer and stirs 1 hour;
3rd step, after second step has stirred, adds refractory aggregate (silica flour, mica powder and pearl essence) and wood ash in grout mixer, continues stirring 3 hours;
4th step, after the 3rd step has stirred, has added wetting agent and defoamer, then has stirred 1 hour in grout mixer;
5th step, after the 4th step has stirred, has added water in grout mixer, continues to be stirred to obtain the homogeneous latex emulsion shape coating that Baume degrees is 1.7-1.8;
Described first and second, the total amount of water used is 600 parts in five steps.
Embodiment two
A kind of Water-based coating for lost foam casting, comprises the raw material of following parts by weight:
Carboxymethyl cellulose 2 parts;
Lithium bentonite 4 parts;
Polyvinyl acetate emulsion 4 parts;
Dry wood ash 4 parts;
Coke ash 2 parts;
1 part, diatomite;
Silica flour 100 parts;
Mica powder 4 parts;
Pearl essence 1 part;
Wetting agent 0.03 part;
Defoamer 0.03 part;
700 parts, water;
The Baume degrees of described coating is 1.7-1.8.
Described silica flour is 200 order particles and dioxide-containing silica is greater than 99%, and mica powder is 325 order particles.
Described lithium bentonite is 325 order particles.
Described oven dry wood ash is the wood ash of broad-leaved arbor.
The preparation method of Water-based coating for lost foam casting, in accordance with the following steps:
The first step, by carboxymethyl cellulose, lithium bentonite mixing, adds water and is stirred to without block, soak 30 hours, make colloidal fluid;
Second step, adds polyvinyl acetate emulsion and water in the colloidal fluid that the first step is made, and pours in grout mixer and stirs 1 hour;
3rd step, after second step has stirred, adds refractory aggregate (silica flour, mica powder and pearl essence), oven dry wood ash, coke ash and diatomite, continues stirring 5 hours in grout mixer;
4th step, after the 3rd step has stirred, has added wetting agent and defoamer, then has stirred 2 hours in grout mixer;
5th step, after the 4th step has stirred, has added water in grout mixer, continues to be stirred to obtain the homogeneous latex emulsion shape coating that Baume degrees is 1.7-1.8;
Described first and second, the total amount of water used is 700 parts in five steps.
Embodiment three
A kind of Water-based coating for lost foam casting, comprises the raw material of following parts by weight:
Carboxymethyl cellulose 1.5 parts;
Lithium bentonite 3.5 parts;
Polyvinyl acetate emulsion 3.5 parts;
Dry wood ash 3.5 parts;
Coke ash 1 part;
1 part, diatomite;
Silica flour 95 parts;
Mica powder 3 parts;
Pearl essence 2 parts;
Wetting agent 0.02 part;
Defoamer 0.02 part;
650 parts, water;
The Baume degrees of described coating is 1.7-1.8.
Described silica flour is 200 order particles and dioxide-containing silica is greater than 99%, and mica powder is 325 order particles.
Described lithium bentonite is 325 order particles.
Described oven dry wood ash is the wood ash of broad-leaved arbor.
The preparation method of Water-based coating for lost foam casting, in accordance with the following steps:
The first step, by carboxymethyl cellulose, lithium bentonite mixing, adds water and is stirred to without block, soak 25 hours, make colloidal fluid;
Second step, adds polyvinyl acetate emulsion and water in the colloidal fluid that the first step is made, and pours in grout mixer and stirs 1 hour;
3rd step, after second step has stirred, adds refractory aggregate (silica flour, mica powder and pearl essence), oven dry wood ash, coke ash and diatomite, continues stirring 4 hours in grout mixer;
4th step, after the 3rd step has stirred, has added wetting agent and defoamer, then has stirred 2.5 hours in grout mixer;
5th step, after the 4th step has stirred, has added water in grout mixer, continues to be stirred to obtain the homogeneous latex emulsion shape coating that Baume degrees is 1.7-1.8;
Described first and second, the total amount of water used is 650 parts in five steps.
Embodiment four
A kind of Water-based coating for lost foam casting, comprises the raw material of following parts by weight:
Carboxymethyl cellulose 1 part;
Lithium bentonite 3 parts;
Polyvinyl acetate emulsion 4 parts;
Silica flour 100 parts;
Mica powder 2 parts;
Pearl essence 3 parts;
Dry wood ash 4 parts;
Coke ash 2 parts;
Wetting agent 0.03 part;
Defoamer 0.03 part;
680 parts, water;
The Baume degrees of described coating is 1.7-1.8.
Described silica flour is 200 order particles and dioxide-containing silica is greater than 99%, and mica powder is 325 order particles.
Described lithium bentonite is 325 order particles.
Described oven dry wood ash is the wood ash of broad-leaved arbor.
The preparation method of Water-based coating for lost foam casting, in accordance with the following steps:
The first step, by carboxymethyl cellulose, lithium bentonite mixing, adds water and is stirred to without block, soak 27 hours, make colloidal fluid;
Second step, adds polyvinyl acetate emulsion and water in the colloidal fluid that the first step is made, and pours in grout mixer and stirs 1 hour;
3rd step, after second step has stirred, adds refractory aggregate (silica flour, mica powder and pearl essence), dries wood ash and coke ash, continue stirring 3 hours in grout mixer;
4th step, after the 3rd step has stirred, has added wetting agent and defoamer, then has stirred 1 hour in grout mixer;
5th step, after the 4th step has stirred, has added water in grout mixer, continues to be stirred to obtain the homogeneous latex emulsion shape coating that Baume degrees is 1.7-1.8;
Described first and second, the total amount of water used is 680 parts in five steps.
Embodiment five
A kind of Water-based coating for lost foam casting, comprises the raw material of following parts by weight:
Carboxymethyl cellulose 2 parts;
Lithium bentonite 4 parts;
Polyvinyl acetate emulsion 3 parts;
Dry wood ash 3 parts;
1 part, diatomite;
Silica flour 97 parts;
Mica powder 4 parts;
Pearl essence 1 part;
Wetting agent 0.02 part;
Defoamer 0.02 part;
620 parts, water;
The Baume degrees of described coating is 1.7-1.8.
Described silica flour is 200 order particles and dioxide-containing silica is greater than 99%, and mica powder is 325 order particles.
Described lithium bentonite is 325 order particles.
Described oven dry wood ash is the wood ash of broad-leaved arbor.
The preparation method of Water-based coating for lost foam casting, in accordance with the following steps:
The first step, by carboxymethyl cellulose, lithium bentonite mixing, adds water and is stirred to without block, soak 28 hours, make colloidal fluid;
Second step, adds polyvinyl acetate emulsion and water in the colloidal fluid that the first step is made, and pours in grout mixer and stirs 1 hour;
3rd step, after second step has stirred, adds refractory aggregate (silica flour, mica powder and pearl essence), dries wood ash and diatomite, continue stirring 4 hours in grout mixer;
4th step, after the 3rd step has stirred, has added wetting agent and defoamer, then has stirred 2 hours in grout mixer;
5th step, after the 4th step has stirred, has added water in grout mixer, continues to be stirred to obtain the homogeneous latex emulsion shape coating that Baume degrees is 1.7-1.8;
Described first and second, the total amount of water used is 620 parts in five steps.
With the Water-based coating for lost foam casting made by above-described embodiment, detect as follows through laboratory properties:
1, concentration, measures concentration with B and reaches 1.7-1.8;
2, viscosity, pours No. 4 standard flow cups into by the coating made, be 27-30s with manual time-keeping;
3, permeability and being coated with property, reaches 1.5 ㎜ after tested;
4, levelability, coating surface is smooth bright and clean, Ra<6;
5, finger is not stained with ash, coating not efflorescence.
The present invention can summarize with other the concrete form without prejudice to spirit of the present invention or principal character.Therefore, no matter from which point, above-mentioned embodiment of the present invention all can only be thought explanation of the present invention and can not limit invention, claims indicate scope of the present invention, and scope of the present invention is not pointed out in above-mentioned explanation, therefore, any change in the implication suitable with claims of the present invention and scope, all should think to be included in the scope of claims.
Claims (8)
1. a Water-based coating for lost foam casting, is characterized in that described coating comprises the raw material of following parts by weight:
Carboxymethyl cellulose 1-2 part;
Lithium bentonite 3-4 part;
Polyvinyl acetate emulsion 3-4 part;
Dry wood ash 3-4 part;
Refractory aggregate 95-105 part;
Wetting agent 0.02-0.03 part;
Defoamer 0.02-0.03 part;
Water 600-700 part;
The Baume degrees of described coating is 1.7-1.8.
2. a kind of Water-based coating for lost foam casting according to claim 1, is characterized in that: described refractory aggregate comprises silica flour 90-100 part, mica powder 2-4 part and pearl essence 1-3 part.
3. a kind of Water-based coating for lost foam casting according to claim 2, is characterized in that: described silica flour is 200 order particles and dioxide-containing silica is greater than 99%, and mica powder is 325 order particles.
4. a kind of Water-based coating for lost foam casting according to claim 1, is characterized in that: be also added with coke ash 1-2 part and 1 part, diatomite in described coating.
5. a kind of Water-based coating for lost foam casting according to claim 1, is characterized in that: described lithium bentonite is 325 order particles.
6. a kind of Water-based coating for lost foam casting according to claim 1, is characterized in that: described oven dry wood ash is the wood ash of broad-leaved arbor.
7. a preparation method for Water-based coating for lost foam casting as described in as arbitrary in claim 1-6, is characterized in that in accordance with the following steps:
The first step, by carboxymethyl cellulose, lithium bentonite mixing, adds water and is stirred to without block, soak 24-30 hour, make colloidal fluid;
Second step, adds polyvinyl acetate emulsion and water in the colloidal fluid that the first step is made, and pours in grout mixer and stirs 1 hour;
3rd step, after second step has stirred, adds refractory aggregate and wood ash in grout mixer, continues to stir 3-5 hour;
4th step, after the 3rd step has stirred, has added wetting agent and defoamer, then has stirred 1-2 hour in grout mixer;
5th step, after the 4th step has stirred, has added water in grout mixer, continues to be stirred to obtain the homogeneous latex emulsion shape coating that Baume degrees is 1.7-1.8;
Described first and second, the total amount of water used is 600-700 part in five steps.
8. the preparation method of Water-based coating for lost foam casting according to claim 7, is characterized in that: the adding material of described 3rd step also comprises coke ash and diatomite.
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| CN201510340096.0A CN104889315A (en) | 2015-06-18 | 2015-06-18 | Water-based coating for lost foam casting and preparation method of coating |
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| CN201510340096.0A CN104889315A (en) | 2015-06-18 | 2015-06-18 | Water-based coating for lost foam casting and preparation method of coating |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105170894A (en) * | 2015-10-09 | 2015-12-23 | 宁夏共享化工有限公司 | Method for preparing flow coating capable of overcoming sulfur seepage defect |
| CN106391999A (en) * | 2016-12-15 | 2017-02-15 | 李文海 | Water base aggressiveness type lost foam coating |
| CN112496255A (en) * | 2020-11-27 | 2021-03-16 | 安徽华飞机械铸锻有限公司 | Preparation method of lost foam casting coating with excellent suspension property |
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| CN101444827A (en) * | 2008-12-24 | 2009-06-03 | 西安理工大学 | Pyrophillite lost foam casting coating and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105170894A (en) * | 2015-10-09 | 2015-12-23 | 宁夏共享化工有限公司 | Method for preparing flow coating capable of overcoming sulfur seepage defect |
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| CN112496255B (en) * | 2020-11-27 | 2023-10-24 | 安徽华飞机械铸锻有限公司 | Preparation method of lost foam casting coating with excellent suspension property |
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Application publication date: 20150909 |