CN110814274A - Lost foam water-based paint for cast high manganese steel and preparation method thereof - Google Patents
Lost foam water-based paint for cast high manganese steel and preparation method thereof Download PDFInfo
- Publication number
- CN110814274A CN110814274A CN201911017240.1A CN201911017240A CN110814274A CN 110814274 A CN110814274 A CN 110814274A CN 201911017240 A CN201911017240 A CN 201911017240A CN 110814274 A CN110814274 A CN 110814274A
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- China
- Prior art keywords
- parts
- water
- based paint
- manganese steel
- lost foam
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
Abstract
The invention discloses a lost foam water-based paint for casting high manganese steel and a preparation method thereof, wherein the water-based paint comprises the following raw materials in parts by weight: 75.0-85.0 parts of high bauxite, 5.0-15 parts of forsterite sand, 5.0-15.0 parts of brown corundum, 2.0-6.0 parts of polyvinyl acetate emulsion, 1.0-1.5 parts of sodium tripolyphosphate, 1.5-2.5 parts of carboxymethyl cellulose, 3.0-5.0 parts of sodium bentonite, 100.2-0.5 parts of OP-100, 0.5-0.5 part of defoaming agent SP-8170.1, 1.5-2.5 parts of iron oxide powder and 50.0-70.0 parts of water. The water-based paint has good coating property, low cost, good casting surface quality, no sand adhesion phenomenon, no harm of silicon dust and toxic gas during use, and safe and environment-friendly production environment.
Description
Technical Field
The invention belongs to the technical field of coatings for lost foam, and particularly relates to a lost foam water-based coating for cast high manganese steel and a preparation method thereof.
Background
At present, in the production process of lost foam casting high manganese steel parts, one of the most critical factors influencing the quality of the casting parts is the coating technology. The lost foam coating can be used for the early stage of casting for producing various alloy castings, and because the molten steel temperature is very high, the alkalinity is strong, the reaction can be easily carried out with the mold wall, and mechanical and chemical sand burning is generated, so that the coating is an essential procedure, the coating can be used for preventing the casting from generating the sand burning defect, the rigidity of an EPS (expandable polystyrene) model is improved, the cavity is favorably exhausted, and the quality of the casting can be improved.
When the sand lost foam is used for producing high manganese steel castings, most of the coatings are alcohol-based magnesite, water-based corundum and the like. However, in lost foam casting, when an alcohol-based coating is adopted, the operating environment is unsafe, the cost is high, and the casting is easy to generate defects, for example, when magnesia powder is adopted as a refractory aggregate, the coating is high in cost and easy to generate spontaneous combustion, when a zircon powder coating is adopted, weakly acidic zircon powder is easy to react with alkaline high manganese steel liquid at high temperature, so that the produced casting can generate chemical bonded sand at a hot spot part, and when a corundum water-based coating is adopted to produce the high manganese steel casting, although the casting quality is good, the coating effect is good, but the corundum is high in cost, and the production and cost requirements of the high manganese steel casting cannot be met.
Disclosure of Invention
In order to solve the technical problems, the invention provides a lost foam water-based paint for casting high manganese steel and a preparation method thereof. The water-based paint has good coating property, low cost, good casting surface quality, no sand adhesion phenomenon, no harm of silicon dust and toxic gas during use, and safe and environment-friendly production environment.
The technical scheme adopted by the invention is as follows:
the lost foam water-based paint for the cast high manganese steel comprises the following raw materials in parts by weight: 75.0-85.0 parts of high bauxite, 5.0-15 parts of forsterite sand, 5.0-15.0 parts of brown corundum, 2.0-6.0 parts of polyvinyl acetate emulsion, 1.0-1.5 parts of sodium tripolyphosphate, 1.5-2.5 parts of carboxymethyl cellulose, 3.0-5.0 parts of sodium bentonite, 100.2-0.5 parts of OP-100, 0.5-0.5 part of defoaming agent SP-8170.1, 1.5-2.5 parts of iron oxide powder and 50.0-70.0 parts of water.
The particle sizes of the high-alumina bauxite, the forsterite sand and the brown corundum are all 200-270 meshes.
Further, the raw materials are preferably selected from the following raw materials in parts by weight: 80 parts of high-alumina bauxite, 10 parts of forsterite sand, 10 parts of brown fused alumina, 6 parts of polyvinyl acetate emulsion, 1.5 parts of sodium tripolyphosphate, 2.5 parts of carboxymethyl cellulose, 5 parts of sodium bentonite, 100.5 parts of OP-100, 78 parts of defoaming agent SP-8170.2, 2.5 parts of iron oxide powder and 60 parts of water.
The raw materials in parts by weight can also be preferably as follows: 83 parts of high-alumina bauxite, 12 parts of forsterite sand, 10 parts of brown fused alumina, 2.0 parts of polyvinyl acetate emulsion, 1.5 parts of sodium tripolyphosphate, 2.0 parts of carboxymethyl cellulose, 5 parts of sodium bentonite, OP-100.5 parts, SP-8170.2 parts of defoaming agent, 2.0 parts of iron oxide powder and 56 parts of water.
The raw materials in parts by weight can also be preferably as follows: 78 parts of high-alumina bauxite, 8 parts of forsterite sand, 8 parts of brown corundum, 2.5 parts of polyvinyl acetate emulsion, 1.0 part of sodium tripolyphosphate, 2.5 parts of carboxymethyl cellulose, 5 parts of sodium bentonite, OP-100.3 parts, SP-8170.4 parts of defoaming agent, 2.0 parts of iron oxide powder and 68 parts of water.
The invention also provides a preparation method of the lost foam water-based paint for the cast high manganese steel, which comprises the following steps:
(1) dry-mixing bauxite, forsterite sand, brown corundum and sodium bentonite according to the formula amount for 0.5 h;
(2) and adding the rest raw materials according to the formula amount, and continuously wet-mixing for 4 hours to obtain the lost foam water-based paint for the cast high manganese steel.
The refractory aggregate of the lost foam water-based paint for the cast high manganese steel is a composite aggregate prepared by mixing bauxite, magnesia olive sand and brown corundum according to a certain proportion, the refractory temperature of the bauxite is more than or equal to 1800 ℃ and the bauxite is not easy to react with metal oxide; the forsterite sand has the refractory temperature of 1690-1710 ℃, strong metal oxide erosion resistance, good thixotropy and lower cost; the refractory temperature of the brown corundum is 1800-2050 ℃, the corrosion resistance is strong, and the brown corundum does not react with acid-base oxides; the combination of the three components can well improve and enhance the processing performance and the working performance of the coating, and the cost is lower.
The adhesive is a composite adhesive formed by mixing polyvinyl acetate emulsion and sodium tripolyphosphate, the polyvinyl acetate emulsion has strong low-temperature adhesive property, can provide required normal-temperature strength for the coating, and has a thickening effect, and the slight corrosivity of the polyvinyl acetate emulsion can slightly corrode the surface of EPS, so that the coating performance of the coating is improved; however, the addition of the polyvinyl acetate emulsion can inhibit the suspension property of the coating, so the dosage of the polyvinyl acetate emulsion needs to be strictly controlled, and the dosage of the polyvinyl acetate emulsion is controlled to be 2.0-6.0 parts; the sodium tripolyphosphate is strong in high-temperature cohesiveness, can improve the capability of the coating for resisting metal liquid scouring, can promote the low-temperature sintering and ceramization of the refractory aggregate, and has good high-temperature strength, but the suspension property of the coating can be damaged due to excessive addition of the sodium tripolyphosphate, so that the proportion of the sodium tripolyphosphate is controlled to be 1.0-1.5 parts of the total mass of the refractory aggregate.
The invention selects sodium bentonite and carboxymethyl cellulose as suspending agents, the suspending agents are used for enabling powder particles to be uniformly suspended and dispersed in carrier liquid so as to ensure that a coating with uniform components is formed on the surface of a model, and meanwhile, the suspending agents also endow the coating with required rheological properties. The suspending agent adopted by the invention is sodium bentonite and CMC (carboxymethyl cellulose), a reticular macromolecular chain can be formed on the macromolecular chain of the CMC in water, and after the sodium bentonite is foamed, fine particles of the sodium bentonite can expand in the water to form a hydrated film which is adhered and floated on the CMC and is lapped into a solid reticular structure, thereby improving the suspension performance of the coating. Therefore, when the two substances with the bonding function are used as the suspending agents and the sodium bentonite suspending agents are selected, the coating is easy to crack if the addition amount is larger as the addition amount is smaller under the premise of ensuring the suspension property, so that the addition amount of the sodium bentonite is 3.0-5.0 parts, and the addition amount of the CMC is 1.5-2.5 parts.
The defoaming agents selected by the invention are OP-10 and SP-817, and the defoaming agents have the advantages of small dosage, low price, good defoaming property, lasting foam inhibition property and no influence on the film forming property of the coating in a water-based system.
Compared with the prior art, the invention has the following advantages:
(1) the invention relates to a water-based paint for casting high manganese steel based on a lost foam, wherein a carrier is water, does not contain toxic and harmful substances, and can provide a good and safe operation and working environment for workers.
(2) The suspending agent adopted by the invention is sodium bentonite and CMC (hydroxy acid cellulose), a reticular macromolecular chain can be formed on the macromolecular chain of the CMC in water, and after the bentonite is foamed, fine particles of the bentonite can expand in the water to form a hydrated film which is adhered and floated on the CMC and is lapped into a cubic reticular structure, thereby improving the suspension performance of the coating.
(3) When the two models are quickly assembled, the two models need to be glued by using the adhesive tape, and the invention has good coating and hanging performance on the EPS models and excellent coating and hanging performance on the adhesive tape.
(4) The water-based paint prepared by the invention has good thixotropy, the thickness of single brushing can meet the use requirement, the brushing times are less, the resources are saved, and the cost is reduced.
(5) The invention uses the composite aggregate mixed by three refractory materials, and simultaneously can effectively eliminate the mechanical sand-sticking and the chemical sand-sticking of the high manganese steel casting due to the good coating quality and obtain good surface finish.
(6) The water-based paint prepared by the invention has low organic content and small gas-forming property, and can effectively prevent the defect of casting pores.
(7) The water-based paint prepared by the invention has excellent performance, low cost and wide popularization value.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1
The lost foam water-based paint for the cast high manganese steel comprises the following raw materials in parts by weight: 80 parts of high-alumina bauxite, 10 parts of forsterite sand, 10 parts of brown fused alumina, 6 parts of polyvinyl acetate emulsion, 1.5 parts of sodium tripolyphosphate, 2.5 parts of carboxymethyl cellulose, 5 parts of sodium bentonite, 100.5 parts of OP-100, 78 parts of defoaming agent SP-8170.2, 2.5 parts of iron oxide powder and 60 parts of water.
The preparation method of the lost foam water-based paint for the cast high manganese steel comprises the following steps:
(1) dry-mixing bauxite, forsterite sand, brown corundum and sodium bentonite according to the formula amount for 0.5 h;
(2) and adding the rest raw materials according to the formula amount, and continuously wet-mixing for 4 hours to obtain the lost foam water-based paint for the cast high manganese steel.
The lost foam water-based paint for the cast high manganese steel prepared by the embodiment has good suspension property and thixotropy, and after tests, the coating performance is good, and the surface of the high manganese steel produced by the EPS model coated with the water-based paint has no sand sticking phenomenon and good surface quality.
Example 2
The lost foam water-based paint for the cast high manganese steel comprises the following raw materials in parts by weight: 83 parts of high-alumina bauxite, 12 parts of forsterite sand, 10 parts of brown fused alumina, 2.0 parts of polyvinyl acetate emulsion, 1.5 parts of sodium tripolyphosphate, 2.0 parts of carboxymethyl cellulose, 5 parts of sodium bentonite, OP-100.5 parts, SP-8170.2 parts of defoaming agent, 2.0 parts of iron oxide powder and 56 parts of water.
The preparation method is the same as that of example 1.
The lost foam water-based paint for the cast high manganese steel prepared by the embodiment has good suspension property and thixotropy, and after tests, the coating performance is good, and the surface of the high manganese steel produced by the EPS model coated with the water-based paint has no sand sticking phenomenon and good surface quality.
Example 3
The lost foam water-based paint for the cast high manganese steel comprises the following raw materials in parts by weight: 78 parts of high-alumina bauxite, 8 parts of forsterite sand, 8 parts of brown corundum, 2.5 parts of polyvinyl acetate emulsion, 1.0 part of sodium tripolyphosphate, 2.5 parts of carboxymethyl cellulose, 5 parts of sodium bentonite, OP-100.3 parts, SP-8170.4 parts of defoaming agent, 2.0 parts of iron oxide powder and 68 parts of water.
The preparation method is the same as that of example 1.
The lost foam water-based paint for the cast high manganese steel prepared by the embodiment has good suspension property and thixotropy, and after tests, the coating performance is good, and the surface of the high manganese steel produced by the EPS model coated with the water-based paint has no sand sticking phenomenon and good surface quality.
The above detailed description of a lost foam water-based paint for cast high manganese steel and a method for preparing the same with reference to the examples is illustrative and not restrictive, and several examples may be cited within the limits thereof, so that variations and modifications thereof without departing from the general concept of the present invention should fall within the scope of the present invention.
Claims (6)
1. The lost foam water-based paint for the cast high manganese steel is characterized by comprising the following raw materials in parts by weight: 75.0-85.0 parts of high bauxite, 5.0-15 parts of forsterite sand, 5.0-15.0 parts of brown corundum, 2.0-6.0 parts of polyvinyl acetate emulsion, 1.0-1.5 parts of sodium tripolyphosphate, 1.5-2.5 parts of carboxymethyl cellulose, 3.0-5.0 parts of sodium bentonite, 100.2-0.5 parts of OP-100, 0.5-0.5 part of defoaming agent SP-8170.1, 1.5-2.5 parts of iron oxide powder and 50.0-70.0 parts of water.
2. The water-based paint for the lost foam for the cast high-manganese steel as recited in claim 1, wherein the grain sizes of the high-alumina bauxite, the forsterite sand and the brown corundum are all 200-270 meshes.
3. The water-based paint for the lost foam for the cast high manganese steel according to claim 1 or 2, which is characterized by comprising the following raw materials in parts by weight: 80 parts of high-alumina bauxite, 10 parts of forsterite sand, 10 parts of brown fused alumina, 6 parts of polyvinyl acetate emulsion, 1.5 parts of sodium tripolyphosphate, 2.5 parts of carboxymethyl cellulose, 5 parts of sodium bentonite, 100.5 parts of OP-100, 78 parts of defoaming agent SP-8170.2, 2.5 parts of iron oxide powder and 60 parts of water.
4. The water-based paint for the lost foam for the cast high manganese steel according to claim 1 or 2, which is characterized by comprising the following raw materials in parts by weight: 83 parts of high-alumina bauxite, 12 parts of forsterite sand, 10 parts of brown fused alumina, 2.0 parts of polyvinyl acetate emulsion, 1.5 parts of sodium tripolyphosphate, 2.0 parts of carboxymethyl cellulose, 5 parts of sodium bentonite, OP-100.5 parts, SP-8170.2 parts of defoaming agent, 2.0 parts of iron oxide powder and 56 parts of water.
5. The water-based paint for the lost foam for the cast high manganese steel according to claim 1 or 2, which is characterized by comprising the following raw materials in parts by weight: 78 parts of high-alumina bauxite, 8 parts of forsterite sand, 8 parts of brown corundum, 2.5 parts of polyvinyl acetate emulsion, 1.0 part of sodium tripolyphosphate, 2.5 parts of carboxymethyl cellulose, 5 parts of sodium bentonite, OP-100.3 parts, SP-8170.4 parts of defoaming agent, 2.0 parts of iron oxide powder and 68 parts of water.
6. The method for preparing a water-based paint for a lost foam for cast high manganese steel according to any one of claims 1 to 5, characterized in that the method comprises the following steps:
(1) dry-mixing bauxite, forsterite sand, brown corundum and sodium bentonite according to the formula amount for 0.5 h;
(2) and adding the rest raw materials according to the formula amount, and continuously wet-mixing for 4 hours to obtain the lost foam water-based paint for the cast high manganese steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911017240.1A CN110814274A (en) | 2019-10-24 | 2019-10-24 | Lost foam water-based paint for cast high manganese steel and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911017240.1A CN110814274A (en) | 2019-10-24 | 2019-10-24 | Lost foam water-based paint for cast high manganese steel and preparation method thereof |
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| CN110814274A true CN110814274A (en) | 2020-02-21 |
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| CN201911017240.1A Pending CN110814274A (en) | 2019-10-24 | 2019-10-24 | Lost foam water-based paint for cast high manganese steel and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115491054A (en) * | 2022-10-13 | 2022-12-20 | 湖北兴龙高温节能材料有限公司 | Forsterite composite anti-oxidation coating for protecting metal material and preparation method and application thereof |
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Application publication date: 20200221 |