CN110666098A - Preparation method of quick-drying water-based lost foam casting coating - Google Patents
Preparation method of quick-drying water-based lost foam casting coating Download PDFInfo
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- CN110666098A CN110666098A CN201911087628.9A CN201911087628A CN110666098A CN 110666098 A CN110666098 A CN 110666098A CN 201911087628 A CN201911087628 A CN 201911087628A CN 110666098 A CN110666098 A CN 110666098A
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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
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- 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
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Abstract
The invention belongs to the technical field of casting coatings, and particularly relates to a preparation method of a quick-drying water-based lost foam casting coating, which adopts a water-soluble quick-drying binder to reduce the permeation of water in the coating into a sand mold, has the advantages of high drying speed, high normal-temperature and high-temperature strength, excellent thixotropy, leveling property, permeability and coating property, brushless coating, flow mark and the like, has excellent suspension stability and good anti-sand-sticking property, and a cast casting has good surface smoothness, clear outline, no sand-sticking, higher strength and high-temperature crack resistance, no foaming, stable quality, convenient use and obvious effect on improving the working environment.
Description
Technical Field
The invention belongs to the technical field of casting coatings, and particularly relates to a preparation method of a quick-drying water-based lost foam casting coating.
Background
The alcohol-based casting coating can be ignited and dried, is convenient to use and occupies a large proportion in the market. The disadvantages are high price, fire and explosion risks, difficult transportation and improved service performance. Water-based coatings are the direction of future coating development, but have the disadvantage of slow evaporation of water, requiring auxiliary drying measures such as infrared, far infrared, micro-crossing, hot air or kiln drying. The casting method for producing castings of stamping tools and the like has great advantages, the cost of the castings is obviously reduced, the quality of the castings is reduced, the degree of freedom of designing cast parts is increased by the lost foam casting which is a great development of the casting technology, the steel parts are cast by the binder-free dry sand full mold, the casting is rarely subjected to hot crack defect coating, the coating is one of key technologies, the quality of the coating performance and the cost are directly related to whether the lost foam casting can be popularized and applied in production, and therefore, the quick-drying water-based lost foam casting coating which can meet the requirements of the lost foam casting needs to be developed.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a preparation method of a quick-drying water-based lost foam casting coating, which is suitable for self-hardening resin sand, cold (hot) core box sand, tung oil sand, aluminum phosphate chromium sand, clay sand and the like.
The invention is realized by the following technical scheme:
a preparation method of a quick-drying water-based lost foam casting coating comprises the following specific steps:
(1) the method comprises the following steps:
step one, injecting 20 ~ 50 parts by weight of deionized water into a reaction kettle, adding 1 ~ 3 parts by weight of aluminum chromium phosphate and 10 ~ 20 parts by weight of cross-linking agent, and stirring at normal temperature;
step two: conveying all the mixed liquid in the reaction kettle to a storage pool for storage and precipitating impurities;
step three, conveying the liquid mixture after precipitation in the storage pool to a reaction kettle, adding 30 ~ 40 parts by weight of silicon dioxide, 1 ~ 1.5.5 parts by weight of reinforcing agent and 5 ~ 8 parts by weight of reinforcing agent, and stirring at normal temperature;
step four, injecting 10 ~ 30 parts by weight of deionized water into another reaction kettle, adding 0.5 ~ 2 parts by weight of waterproof agent and 0.5 ~ 1 parts by weight of toughening agent, heating to 90 ~ 120 ℃ and 120 ℃, uniformly stirring, discharging into a cooling pool, and cooling to 20 ~ 40 ℃;
step five, mixing the liquids obtained in the step three and the step four, adding 0.5 ~ 1 parts of penetrating agent, 0.1 ~ 0.5.5 parts of crosslinking modifier and 1 ~ 2 parts of retarder by weight, and stirring at normal temperature to obtain the quick-drying water-based lost foam casting coating;
further, the waterproofing agent is oleamide, the toughening agent is calcium lignosulfonate or hydroxypropyl cellulose, the reinforcing agent is basalt fiber, and the retarder is one of dioctyl sodium sulfosuccinate, sodium alkyl sulfonate and sodium allyl sulfonate.
Further, the cross-linking agent is one of vinyl triisopropenoxysilane, 2-chromium methacrylate chloride and ethylene glycol dimethacrylate.
Further, the penetrant is selected from one or more of hydrogenated castor oil, disodium laureth sulfosuccinate, dioctyl sodium sulfosuccinate, and polyvinylpyrrolidone.
Further, the crosslinking modifier is selected from one or more of aluminum isopropoxide, vermiculite powder, ferric chloride, ammonium chloride, magnesium oxide, aluminum chloride and zinc acetate.
The invention has the beneficial effects that:
the seawater magnesite has small thermal expansion rate, good thermal stability and chemical stability, does not react with acid and alkali, and has low price. The solvent is water, and a penetrating agent is added to facilitate cleaning of the casting. The application of water-based coatings to sand cores and the formation of coatings results in the simultaneous production and consumption of free water. After the sand core is dip-coated with the coating which always occurs when the coating adopted by the application separates the dead water from the suspension system, the water in the coating, whether the water combined in the suspension system or the water separated from the suspension system, can permeate into the sand core and simultaneously evaporate to the outside. When the free water is accumulated at a rate lower than the rate at which it is consumed, it is not easily broken.
Compared with the prior art, the invention has the following advantages:
the coating disclosed by the invention has the advantages of high drying speed, high normal-temperature and high-temperature strength, excellent thixotropy, leveling property, permeability and coating property, brushless coating, flow mark and the like, excellent suspension stability, good sand-sticking resistance, good surface smoothness of a cast product, clear profile, no sand sticking, higher strength and high-temperature crack resistance, no foaming, stable quality, convenience in use and obvious effect of improving the working environment.
Detailed Description
The invention is illustrated by the following specific examples, which are not intended to be limiting.
Example 1
A preparation method of a quick-drying water-based lost foam casting coating comprises the following specific steps:
(1) the method comprises the following steps:
the method comprises the following steps: 50 parts by weight of deionized water is injected into the reaction kettle, 3 parts by weight of aluminum chromium phosphate and 20 parts by weight of cross-linking agent are added, and stirring is carried out at normal temperature;
step two: conveying all the mixed liquid in the reaction kettle to a storage pool for storage and precipitating impurities;
step three: conveying the liquid mixture after precipitation in the storage pool to a reaction kettle, adding 40 parts by weight of silicon dioxide, 1.5 parts by weight of reinforcing agent and 8 parts by weight of reinforcing agent, and stirring at normal temperature;
step four: injecting 30 parts by weight of deionized water into another reaction kettle, adding 2 parts by weight of waterproof agent and 1 part by weight of toughening agent, heating to 120 ℃, uniformly stirring, discharging into a cooling pool, and cooling to 20 ℃;
step five: mixing the liquids obtained in the third step and the fourth step, adding 0.5 part of penetrating agent, 0.1 part of crosslinking modifier and 1 part of retarder by weight, and stirring at normal temperature to obtain the quick-drying water-based lost foam casting coating;
further, the waterproofing agent is oleamide, the toughening agent is hydroxypropyl cellulose, the reinforcing agent is basalt fiber, and the retarder is dioctyl sodium sulfosuccinate.
Further, the cross-linking agent is one of ethylene glycol dimethacrylate.
Further, the penetrant is selected from hydrogenated castor oil.
Further, the crosslinking modifier is zinc acetate.
Example 2
A preparation method of a quick-drying water-based lost foam casting coating comprises the following specific steps:
(1) the method comprises the following steps:
the method comprises the following steps: 50 parts by weight of deionized water is injected into the reaction kettle, 3 parts by weight of aluminum chromium phosphate and 20 parts by weight of cross-linking agent are added, and stirring is carried out at normal temperature;
step two: conveying all the mixed liquid in the reaction kettle to a storage pool for storage and precipitating impurities;
step three: conveying the liquid mixture after precipitation in the storage pool to a reaction kettle, adding 40 parts by weight of silicon dioxide, 1.5 parts by weight of reinforcing agent and 8 parts by weight of reinforcing agent, and stirring at normal temperature;
step four: injecting 30 parts by weight of deionized water into another reaction kettle, adding 2 parts by weight of waterproof agent and 1 part by weight of toughening agent, heating to 120 ℃, uniformly stirring, discharging into a cooling pool, and cooling to 40 ℃;
step five: mixing the liquids obtained in the third step and the fourth step, adding 1 part of penetrating agent, 0.5 part of crosslinking modifier and 2 parts of retarder by weight, and stirring at normal temperature to obtain the quick-drying water-based lost foam casting coating;
further, the waterproofing agent is oleamide, the toughening agent is calcium lignosulfonate, the reinforcing agent is basalt fiber, and the retarder is sodium allylsulfonate.
Further, the cross-linking agent is 2-methacrylic acid chromium chloride.
Further, the penetrant is disodium laureth sulfosuccinate.
Further, the crosslinking modifier is selected from aluminum isopropoxide.
Comparative example 1
This comparative example compares to example 2 in step five, the penetrant component is omitted, except that the process steps are otherwise the same.
Comparative example 2
In this comparative example, compared to example 2, in step five, the crosslinking modifier was omitted except that the process steps were otherwise identical.
Comparative example 3
This comparative example compares to example 2 in step five, the retarder component is omitted except the process steps are the same.
Comparative example 4
In this comparative example, the toughener component was omitted in step four, as compared to example 2, except that the process steps were otherwise identical.
Comparative example 5
This comparative example compares to example 2 in step three, the enhancer component is omitted except that the process steps are otherwise the same.
Table 1 performance test comparison results of quick-drying water-based lost foam casting coatings of examples and comparative examples
Note: JB/T9226-1999 Sand casting coating; paint experimental method for JB/T5107-1991 sand casting
Casting the automobile steel ring carbon steel part by using the water-based lost foam casting coating of the embodiment 1-2, drying the coating at the temperature lower than 50 ℃, but continuously flowing in the casting process, shakeout after casting, finding that the surface quality of a casting is good, having low seepage to a sand mold (core), having small adverse effect on the strength of the sand mold, and ensuring that the self-drying speed is high, and the coating with the thickness of 0.2mm can be completely and naturally dried within 1h under the conditions of the ambient temperature of 25 ℃ and the relative humidity of 80%; under the conditions that the thickness of the coating is 0.8mm and the temperature of hot air is 80 ℃, the hot air quick-drying time of the coating is within 1h, and the drying speed reaches and is higher than the advanced level of similar products at home and abroad, thereby meeting the production requirements.
As can be seen from Table 1, the water-based evaporative pattern casting coating disclosed in the examples 1-2 of the invention has good suspension property and high air permeability, and is beneficial to discharging of the casting gasified gas . The coating has good dip-coating property, does not flow, improves the environment of a casting site, and is beneficial to the health of workers. The cast casting has the advantages of good surface quality reclamation, high dimensional precision, moderate coating strength and popularization and use value.
Claims (5)
1. A preparation method of a quick-drying water-based lost foam casting coating is characterized by comprising the following specific steps:
(1) the method comprises the following steps:
step one, injecting 20 ~ 50 parts by weight of deionized water into a reaction kettle, adding 1 ~ 3 parts by weight of aluminum chromium phosphate and 10 ~ 20 parts by weight of cross-linking agent, and stirring at normal temperature;
step two: conveying all the mixed liquid in the reaction kettle to a storage pool for storage and precipitating impurities;
step three, conveying the liquid mixture after precipitation in the storage pool to a reaction kettle, adding 30 ~ 40 parts by weight of silicon dioxide, 1 ~ 1.5.5 parts by weight of reinforcing agent and 5 ~ 8 parts by weight of reinforcing agent, and stirring at normal temperature;
step four, injecting 10 ~ 30 parts by weight of deionized water into another reaction kettle, adding 0.5 ~ 2 parts by weight of waterproof agent and 0.5 ~ 1 parts by weight of toughening agent, heating to 90 ~ 120 ℃ and 120 ℃, uniformly stirring, discharging into a cooling pool, and cooling to 20 ~ 40 ℃;
and step five, mixing the liquids obtained in the step three and the step four, adding 0.5 ~ 1 parts of penetrating agent, 0.1 ~ 0.5.5 parts of crosslinking modifier and 1 ~ 2 parts of retarder by weight, and stirring at normal temperature to obtain the quick-drying water-based lost foam casting coating.
2. The preparation method of the quick-drying water-based lost foam casting coating according to claim 1, wherein the waterproofing agent is oleamide, the toughening agent is calcium lignosulfonate or hydroxypropyl cellulose, the reinforcing agent is basalt fiber, and the retarder is one of dioctyl sodium sulfosuccinate, sodium alkyl sulfonate and sodium allyl sulfonate.
3. The method for preparing a quick-drying water-based lost foam casting coating according to claim 1, wherein the crosslinking agent is one of vinyl triisopropenoxysilane, chromium 2-methacrylate chloride, and ethylene glycol dimethacrylate.
4. The method of preparing a quick-drying water-based lost foam casting coating of claim 1, wherein the penetrant is selected from one or more of hydrogenated castor oil, disodium laureth sulfosuccinate, dioctyl sodium sulfosuccinate, and polyvinylpyrrolidone.
5. The method of preparing a quick-drying water-based lost foam casting coating of claim 1, wherein the crosslinking modifier is selected from one or more of aluminum isopropoxide, vermiculite powder, ferric chloride, ammonium chloride, magnesium oxide, aluminum chloride, and zinc acetate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911087628.9A CN110666098A (en) | 2019-11-08 | 2019-11-08 | Preparation method of quick-drying water-based lost foam casting coating |
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| CN201911087628.9A CN110666098A (en) | 2019-11-08 | 2019-11-08 | Preparation method of quick-drying water-based lost foam casting coating |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103878302A (en) * | 2014-03-03 | 2014-06-25 | 珠海市斗门福联造型材料实业有限公司 | Water-based self-drying/quick-drying sand type casting coating and preparation method thereof |
| CN104031564A (en) * | 2014-06-13 | 2014-09-10 | 连云港保丽森实业有限公司 | Fireproof environment-friendly inorganic adhesive as well as preparation method and preparation system thereof |
| CN107952929A (en) * | 2017-11-23 | 2018-04-24 | 山东蒙沃变速器有限公司 | A kind of water base lost foam casting coating |
| CN109894571A (en) * | 2019-03-19 | 2019-06-18 | 谭建平 | A kind of preparation method of cast paint |
-
2019
- 2019-11-08 CN CN201911087628.9A patent/CN110666098A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103878302A (en) * | 2014-03-03 | 2014-06-25 | 珠海市斗门福联造型材料实业有限公司 | Water-based self-drying/quick-drying sand type casting coating and preparation method thereof |
| CN104031564A (en) * | 2014-06-13 | 2014-09-10 | 连云港保丽森实业有限公司 | Fireproof environment-friendly inorganic adhesive as well as preparation method and preparation system thereof |
| CN107952929A (en) * | 2017-11-23 | 2018-04-24 | 山东蒙沃变速器有限公司 | A kind of water base lost foam casting coating |
| CN109894571A (en) * | 2019-03-19 | 2019-06-18 | 谭建平 | A kind of preparation method of cast paint |
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Application publication date: 20200110 |