CN112570644A - Coating and preparation method thereof - Google Patents
Coating and preparation method thereof Download PDFInfo
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- CN112570644A CN112570644A CN202011448398.7A CN202011448398A CN112570644A CN 112570644 A CN112570644 A CN 112570644A CN 202011448398 A CN202011448398 A CN 202011448398A CN 112570644 A CN112570644 A CN 112570644A
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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
Abstract
The invention discloses a coating and a preparation method thereof, wherein the coating comprises the following raw materials in percentage by weight: containing bentonite (CTAB)3PW12O40Modified Al2O324-28% of composite powder, 2-5% of polyvinyl butyral, 5-9% of graphite powder and Sb (BrO)3)526-30% of bentonite composite material and ZrSiO412-18% of Na [ AlSi ] as the rest3O8]Powder; the coating has the advantages of simple formula, good suspension property after being mixed with ethanol, uniform coating, no coating defect after coating, guaranteed overall strength of the coating and better isolation effect.
Description
Technical Field
The invention belongs to the technical field of coating materials, relates to a coating and a preparation method, and particularly relates to a coating for sand casting and a preparation method.
Background
Sand casting is a casting method for producing castings in sand molds. In the production of castings from sand molds, the application of casting coatings to the working surfaces of the mold (core) is a very important process. The high quality of the casting coating is the most direct factor influencing whether the casting is bonded with sand, sanded, the surface smoothness of the casting and the dimensional precision of the casting.
Although the currently used coating for sand casting can basically meet the performances, the formula of the coating is complex, the suspension stability value is low, the coating uniformity is poor, the coating defect occurs, the overall strength of the coating is affected, and the isolation effect on molten iron and a casting mold is poor.
Disclosure of Invention
The invention provides a coating and a preparation method for solving the technical problems, in particular to a coating for sand casting and a preparation method thereof. Low production cost and suitability for industrial production.
The technical scheme adopted by the invention is as follows:
the coating comprises the following raw materials in percentage by weight: containing bentonite (CTAB)3PW12O40Modified Al2O324-28% of composite powder, 2-5% of polyvinyl butyral, 5-9% of graphite powder and Sb (BrO)3)526-30% of bentonite composite material and ZrSiO412-18% of Na [ AlSi ] as the rest3O8]And (3) powder.
Further, the polyvinyl butyral is a low viscosity polyvinyl butyral.
Further, the bentonite-Containing (CTAB)3PW12O40Modified Al2O3The preparation method of the composite powder comprises the following steps:
s1, adding CTAB in a mixed solvent of ethanol and water twice, stirring and mixing uniformly after each addition, then sequentially adding phosphotungstic acid and bentonite, stirring for 1-1.5 h, standing for 20-30min at 50-55 ℃, washing, filtering and drying to obtain the bentonite-Containing (CTAB)3PW12O40Powder;
s2, adding alkali liquor with the molar weight being 6 times of that of the aluminum salt into the aqueous solution of the aluminum salt, stirring for 2-5 min, and adding the bentonite-Containing (CTAB) obtained in the step S13PW12O40Continuously stirring the powder to react for 0.5-1 h, washing, filtering, drying, heating to 210 ℃ and 250 ℃ and keeping for 2-4h to obtain (CTAB) containing bentonite3PW12O40Modified Al2O3And (3) composite powder.
Further, in step S2, the aluminum salt is Al2(SO4)3(ii) a The concentration of the aluminum salt aqueous solution is 105-110 g/L;
furthermore, the mass ratio of CTAB and phosphotungstic acid is 5-8: 1; the mass of the bentonite is CTAB and phosphotungstic acid3-9% of the mass sum; said bentonite-Containing (CTAB)3PW12O40The mass of the powder is 3-9% of that of the aluminum salt.
Further, the Sb (BrO)3)5The preparation method of the bentonite composite material comprises the following steps: mixing bentonite and Sb (BrO)3)5Dispersing in deionized water, adding sodium carbonate, stirring, mixing, keeping at 50-70 deg.C for 18-24 hr, filtering, and drying to obtain Sb (BrO)3)5A bentonite composite material.
Further, the bentonite, Sb (BrO)3)5The mass ratio of (A) to (B) is 100:0.1 to 0.2; the sodium carbonate comprises bentonite and Sb (BrO)3)54-7% of the sum of the mass.
Further, the particle sizes of the bentonite are 80-120 meshes respectively.
Further, the bentonite-Containing (CTAB)3PW12O40Modified Al2O3Composite powder, graphite powder, Sb (BrO)3)5Bentonite composite material and ZrSiO4、Na[AlSi3O8]The granularity of the powder is 200-325 meshes.
The drying is carried out at 70-90 ℃ for 0.5-2h.
Furthermore, when the coating for sand casting is used, ethanol with the weight being 20% of the weight of the solid material is added, stirred and mixed uniformly.
The preparation method of the coating comprises the following steps: the raw materials with the formula ratio are mixed and stirred uniformly.
In the formula of the coating provided by the invention, the suspending agent is Sb (BrO)3)5Bentonite composite material as main material, containing bentonite (CTAB)3PW12O40Modified Al2O3Composite powder and Na [ AlSi ]3O8]The auxiliary binder is Sb (BrO)3)5Bentonite composite material and low viscosity polyvinyl butyral as main material, and graphite powder and ZrSiO4The addition of (2) is not easy to agglomerate and has good dispersibility. The coating material of the invention contains bentonite (CTAB)3PW12O40Modified Al2O3Composite powder and ZrSiO4The material has higher body strength, and the high and low temperature strength of the material is obviously improved. Sb (BrO)3)5Bentonite composite and bentonite-Containing (CTAB)3PW12O40Modified Al2O3Composite powder and Na [ AlSi ]3O8]And the suspension property of the coating material is ensured by matching. Sb (BrO) in coating material3)5Bentonite composite and bentonite-Containing (CTAB)3PW12O40Modified Al2O3Composite powder and Na [ AlSi ]3O8]Has good affinity, strengthens the strength by strengthening the adhesion with the composite powder and greatly improves the strength of the coating material. Graphite powder and ZrSiO in coating material4Has a peelability to the casting body. ZrSiO in paint4Has good heat insulation and heat resistance in the material and good high-temperature stability.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1
The coating for sand casting comprises the following raw materials in percentage by weight: containing bentonite (CTAB)3PW12O40Modified Al2O328% of composite powder, 2% of polyvinyl butyral, 5% of graphite powder and Sb (BrO)3)526% of bentonite composite material and ZrSiO412% and the balance of Na [ AlSi ]3O8]And (3) powder.
Said bentonite-Containing (CTAB)3PW12O40Modified Al2O3The preparation method of the composite powder comprises the following steps:
s1, adding 0.5mol of CTAB into a mixed solvent of 1000mL of ethanol and 1000mL of water, stirring for 15min, then adding 0.5mol of CTAB, stirring for 15min, continuously adding 0.165mol of phosphotungstic acid, stirring for 3 min, then adding bentonite, wherein the mass of the bentonite is 5% of the sum of the mass of the CTAB and the mass of the phosphotungstic acid, stirring for 1h, and stirring at 50 ℃ for 1hStanding for 30min, washing with ethanol, vacuum filtering, and oven drying at 50 deg.C to obtain bentonite-Containing (CTAB)3PW12O40Powder;
s2, Al with concentration of 105g/L2(SO4)3Adding 6 times molar amount of alkali solution into the aqueous solution, stirring for 5min, adding the bentonite-Containing (CTAB) obtained in step S13PW12O40Powder of bentonite (CTAB)3PW12O40The mass of the powder is Al2(SO4)35 percent of the mass, continuously stirring and reacting for 1 hour, and then washing the precipitate for 2-3 times by using distilled water and absolute ethyl alcohol respectively. Drying in a drying oven for 1 hr, heating to 230 deg.C, and maintaining for 3.0 hr to obtain bentonite-Containing (CTAB)3PW12O40Modified Al2O3And (3) composite powder.
Said Sb (BrO)3)5The preparation method of the bentonite composite material comprises the following steps: mixing bentonite and Sb (BrO)3)5Dispersed in deionized water according to the mass ratio of 100:0.1, wherein the mass of the deionized water is bentonite and Sb (BrO)3)5The mass of the mixture is 10 times of the total mass of the components, and after the mixture is stirred evenly, Sb (BrO) is added3)5Stirring sodium carbonate accounting for 5 percent of the weight of the bentonite mixture for 15min, preserving heat at 60 ℃ for 20h, filtering, and drying at 90 ℃ for 1.0h to obtain the Sb (BrO)3)5A bentonite composite material.
The preparation method of the coating for sand casting comprises the following steps: the raw materials with the formula ratio are mixed and stirred uniformly.
Ethanol accounting for 20 percent of the weight of the coating for sand casting obtained in the embodiment is added into the coating for sand casting, and the coating material for casting mold prepared in the embodiment is uniformly stirred and mixed, and the suspension property is measured by referring to the method in JBT 9226-2008 coating for sand casting, and the result shows that the suspension rate is 99.5 percent.
The coating for sand casting prepared in the embodiment is added with ethanol accounting for 20% of the weight of the coating, stirred and mixed uniformly, then coated on the surface of molding sand, dried at 150 ℃ for 1h to form a coating with the thickness of 0.5-1.0 mm, and then the coating is used for producing iron castings, wherein the produced iron castings have smooth surfaces, no defects such as sand sticking and sand holes and the like, and the rejection rate is below 0.3%.
Example 2
The rest of the coating is the same as the coating in the embodiment 1, except that the coating for sand casting comprises the following raw materials in percentage by weight: containing bentonite (CTAB)3PW12O40Modified Al2O326% of composite powder, 4% of polyvinyl butyral, 7% of graphite powder and Sb (BrO)3)528% of bentonite composite material and ZrSiO414% and the balance of Na [ AlSi ]3O8]And (3) powder.
Ethanol accounting for 20 percent of the weight of the coating for sand casting obtained in the embodiment is added into the coating for sand casting, and the coating material for casting mold prepared in the embodiment is uniformly stirred and mixed, and the suspension property is measured by referring to the method in JBT 9226-2008 coating for sand casting, and the result shows that the suspension rate is 99.8 percent.
The coating for sand casting prepared in the embodiment is added with ethanol accounting for 20% of the weight of the coating, stirred and mixed uniformly, then coated on the surface of molding sand, dried at 150 ℃ for 1h to form a coating with the thickness of 0.5-1.0 mm, and then the coating is used for producing iron castings, wherein the produced iron castings have smooth surfaces, no defects such as sand sticking and sand holes and the like, and the rejection rate is below 0.2%.
Example 3
The rest of the coating is the same as the coating in the embodiment 1, except that the coating for sand casting comprises the following raw materials in percentage by weight: containing bentonite (CTAB)3PW12O40Modified Al2O328% of composite powder, 5% of polyvinyl butyral, 9% of graphite powder and Sb (BrO)3)530% of bentonite composite material and ZrSiO418 percent, and the balance of Na [ AlSi ]3O8]And (3) powder.
Ethanol accounting for 20 percent of the weight of the coating for sand casting obtained in the embodiment is added into the coating for sand casting, and the coating material for casting mold prepared in the embodiment is uniformly stirred and mixed, and the suspension property is measured by referring to the method in JBT 9226-2008 coating for sand casting, and the result shows that the suspension rate is 99.5 percent.
The coating for sand casting prepared in the embodiment is added with ethanol accounting for 20% of the weight of the coating, stirred and mixed uniformly, then coated on the surface of molding sand, dried at 150 ℃ for 1h to form a coating with the thickness of 0.5-1.0 mm, and then the coating is used for producing iron castings, wherein the produced iron castings have smooth surfaces, no defects such as sand sticking and sand holes and the like, and the rejection rate is below 0.2%.
Comparative example 1
The rest of the coating is the same as the coating in the embodiment 1, except that the coating for sand casting comprises the following raw materials in percentage by weight: containing bentonite (CTAB)3PW12O40Modified Al2O322% of composite powder, 1% of polyvinyl butyral, 3% of graphite powder and Sb (BrO)3)5Bentonite composite material 23%, ZrSiO410% and the balance of Na [ AlSi ]3O8]And (3) powder.
Ethanol accounting for 20 percent of the weight of the coating for sand casting obtained in the comparative example was added, stirred and mixed uniformly, and the suspension of the coating material for casting mold prepared in this example was measured by referring to the method in JBT 9226-2008 coating for sand casting, and the result showed that the suspension rate was 99 percent.
The coating for sand casting prepared in the comparative example is added with ethanol accounting for 20% of the weight of the coating, stirred and mixed uniformly, then coated on the surface of molding sand, dried at 150 ℃ for 1h to form a coating with the thickness of 0.5-1.0 mm, and then the coating is used for producing iron castings, wherein the produced iron castings have smooth surfaces, no defects such as sand sticking and sand holes and the like, and the rejection rate is below 0.6%.
Comparative example 2
The rest of the coating is the same as the coating in the embodiment 1, except that the coating for sand casting comprises the following raw materials in percentage by weight: containing bentonite (CTAB)3PW12O40Modified Al2O330% of composite powder, 7% of polyvinyl butyral, 10% of graphite powder and Sb (BrO)3)532% of bentonite composite material and ZrSiO420% of Na [ AlSi ] and the balance of3O8]And (3) powder.
Ethanol accounting for 20 percent of the weight of the coating for sand casting obtained in the comparative example was added, stirred and mixed uniformly, and the suspension of the coating material for casting mold prepared in this example was measured by referring to the method in JBT 9226-2008 coating for sand casting, and the result showed that the suspension rate was 99 percent.
The coating for sand casting prepared in the comparative example is added with ethanol accounting for 20% of the weight of the coating, stirred and mixed uniformly, then coated on the surface of molding sand, dried at 150 ℃ for 1h to form a coating with the thickness of 0.5-1.0 mm, and then the coating is used for producing iron castings, wherein the produced iron castings have smooth surfaces, no defects such as sand sticking and sand holes and the like, and the rejection rate is below 0.4%.
The above detailed description of a coating and the method of preparation with reference to the examples is illustrative and not restrictive, and several examples are set forth within the scope hereof, and thus variations and modifications may be made without departing from the general inventive concept within the scope hereof.
Claims (8)
1. The coating is characterized by comprising the following raw materials in percentage by weight: containing bentonite (CTAB)3PW12O40Modified Al2O324-28% of composite powder, 2-5% of polyvinyl butyral, 5-9% of graphite powder and Sb (BrO)3)526-30% of bentonite composite material and ZrSiO412-18% of Na [ AlSi ] as the rest3O8]And (3) powder.
2. The coating of claim 1, wherein the bentonite-Containing (CTAB)3PW12O40Modified Al2O3The preparation method of the composite powder comprises the following steps:
s1, adding CTAB in a mixed solvent of ethanol and water twice, stirring and mixing uniformly after each addition, then sequentially adding phosphotungstic acid and bentonite, stirring for 1-1.5 h, standing for 20-30min at 50-55 ℃, washing, filtering and drying to obtain the bentonite-Containing (CTAB)3PW12O40Powder;
s2, adding 6 times of aluminum salt to the aqueous solutionStirring a molar amount of alkali liquor for 2-5 min, and adding the bentonite-Containing (CTAB) obtained in the step S13PW12O40Continuously stirring the powder to react for 0.5-1 h, washing, filtering, drying, heating to 210 ℃ and 250 ℃ and keeping for 2-4h to obtain (CTAB) containing bentonite3PW12O40Modified Al2O3And (3) composite powder.
3. The coating according to claim 2, wherein the mass ratio of CTAB to phosphotungstic acid is 5-8: 1; the mass of the bentonite is 3-9% of the sum of the mass of CTAB and phosphotungstic acid; said bentonite-Containing (CTAB)3PW12O40The mass of the powder is 3-9% of that of the aluminum salt.
4. The coating of claim 1, wherein the Sb (BrO)3)5The preparation method of the bentonite composite material comprises the following steps: mixing bentonite and Sb (BrO)3)5Dispersing in deionized water, adding sodium carbonate, stirring, mixing, keeping at 50-70 deg.C for 18-24 hr, filtering, and drying to obtain Sb (BrO)3)5A bentonite composite material.
5. The coating according to claim 4, characterized in that said bentonite, Sb (BrO)3)5The mass ratio of (A) to (B) is 100:0.1 to 0.2; the sodium carbonate comprises bentonite and Sb (BrO)3)54-7% of the sum of the mass.
6. The coating of claim 1, wherein the bentonite-Containing (CTAB)3PW12O40Modified Al2O3Composite powder, graphite powder, Sb (BrO)3)5Bentonite composite material and ZrSiO4、Na[AlSi3O8]The granularity of the powder is 200-325 meshes.
7. The coating according to claim 1, wherein the coating for sand casting is added with ethanol accounting for 20% of the weight of solid materials during use and is stirred and mixed uniformly.
8. A method for preparing the coating according to any one of claims 1 to 7, wherein the method comprises the steps of mixing the raw materials in the formula amount and uniformly stirring.
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Citations (5)
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| CN1082466A (en) * | 1993-02-15 | 1994-02-23 | 大连冷冻机厂 | Resin sand mould (core) or cast part type (core) is used water based paint |
| CN102139342A (en) * | 2011-03-07 | 2011-08-03 | 衡阳中钢衡重铸锻有限公司 | High-permeability sand-burning-preventing paint for casting and preparation method thereof |
| CN103056290A (en) * | 2013-01-25 | 2013-04-24 | 南京信息工程大学 | Heat-resisting cast iron casting coating and preparation method thereof |
| CN105251937A (en) * | 2015-11-30 | 2016-01-20 | 吴江市液铸液压件铸造有限公司 | Casting paint for stainless steel casting |
| CN109014022A (en) * | 2018-07-27 | 2018-12-18 | 马鞍山市兴隆铸造有限公司 | A kind of casting metal antiseepage antireflective coating material |
-
2020
- 2020-12-09 CN CN202011448398.7A patent/CN112570644B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1082466A (en) * | 1993-02-15 | 1994-02-23 | 大连冷冻机厂 | Resin sand mould (core) or cast part type (core) is used water based paint |
| CN102139342A (en) * | 2011-03-07 | 2011-08-03 | 衡阳中钢衡重铸锻有限公司 | High-permeability sand-burning-preventing paint for casting and preparation method thereof |
| CN103056290A (en) * | 2013-01-25 | 2013-04-24 | 南京信息工程大学 | Heat-resisting cast iron casting coating and preparation method thereof |
| CN105251937A (en) * | 2015-11-30 | 2016-01-20 | 吴江市液铸液压件铸造有限公司 | Casting paint for stainless steel casting |
| CN109014022A (en) * | 2018-07-27 | 2018-12-18 | 马鞍山市兴隆铸造有限公司 | A kind of casting metal antiseepage antireflective coating material |
Non-Patent Citations (1)
| Title |
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| 秦立波等: "(CTAB)3PW12O40纳米材料的制备、表征及其对油品中含硫化合物的脱除", 《中小企业管理与科技》 * |
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