CN110576146B - Preparation method of coating for sand core for improving casting quality - Google Patents
Preparation method of coating for sand core for improving casting quality Download PDFInfo
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G83/00—Macromolecular compounds not provided for in groups C08G2/00 - C08G81/00
- C08G83/001—Macromolecular compounds containing organic and inorganic sequences, e.g. organic polymers grafted onto silica
Abstract
The invention discloses a preparation method of a coating for a sand core for improving casting quality, which comprises the following steps: s1, preparing a mixture A; s2, carrying out acid leaching treatment on the graphene nanosheets; s3, acylating the graphene nanosheets; s4, preparing a material B; s5, weighing raw materials; s6, preparing a finished product coating. The preparation method disclosed by the invention is simple in overall process, reasonable in matching of the steps, low in production cost, safe and environment-friendly, and the prepared coating has good strength and impact resistance, is good in heat conductivity and not easy to crack, effectively improves the surface precision of the casting and improves the casting quality.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a preparation method of a coating for a sand core, which is used for improving the casting quality.
Background
At present, in the molding and core preparation process, because the precoated sand has good moldability, high sand core strength, clear outline and high dimensional precision, the most complex shell core can be manufactured, and the process is rapidly developed abroad. At present, the precoated sand is widely applied to industries such as automobiles, diesel engines, hydraulic parts and the like, and can meet the production requirements of various complex precision castings.
The coating for the coated sand core is characterized in that: firstly, because the shell core sand grains have fine granularity: 70/140, the surface is hydrophobic, so the coating has strong permeability, and the shell core has complex shape and thin sand core, which is surrounded by metal liquid, so the coating has excellent sand washing and sticking resistance; secondly, the requirement on the dimensional precision and the surface roughness of the shell core casting is high, and the dripping resistance and the accumulation resistance of the coating are high; a thin, smooth and uniform coating is formed on the surface of the shell core, and the coating has strong covering capability and good dispersibility and adhesiveness. In "a non-polluting water-based dip coating" in patent application No. 200610046059.X, a water-based dip coating is disclosed: the composite material consists of zircon powder 17-30 wt%, brown corundum 20-35 wt%, mullite 5-15 wt%, graphite 5-15 wt%, forsterite 5-15 wt%, polyvinyl alcohol 1-4 wt%, suspending agent 1.5-3.5 wt% and water 30-45 wt%. Wherein polyvinyl alcohol is used as a binder, and the suspending agent is prepared from illite, sepiolite and bentonite according to the ratio of 1: 0.5. "however, the content of the above patent is deficient in that: 1. the zircon powder with the highest content of 30 percent is used, the zircon powder in China is deficient in resources, mostly depends on import and is expensive, so that the source of raw materials of the coating is limited, and the cost is increased. 2. The refractory aggregate has more components, and if the quality of a certain component raw material fluctuates, the performance of the whole coating system is influenced, and the sintering performance and other performances of the coating are not easy to control. 3. The polyvinyl alcohol organic binder is used, so that the high-temperature strength of the coating is low, and the anti-sand-sticking and sand-washing capabilities of the coating are poor.
Disclosure of Invention
The invention aims to provide a preparation method of a coating for a sand core, which is used for improving the casting quality, aiming at the existing problems.
The invention is realized by the following technical scheme:
a preparation method of a coating for sand cores for improving casting quality comprises the following steps:
s1, preparing cyclodextrin, ethylenediamine, 2-pyrenebutyric acid, N-hydroxysuccinimide, dimethylaminopyridine and N, N-dimethylformamide according to the weight-volume ratio of 20-25 g: 70-90 ml, 5-7 g, 2-3 g, 1-1.5 g: mixing 360-380 ml together, putting into a reaction kettle, adding dicyclohexylcarbodiimide into the reaction kettle, continuously stirring for 3-5 hours, taking out, putting into acetone for precipitation, centrifuging, and taking out supernatant to obtain a mixture A for later use;
s2, immersing the graphene nanosheets into a nitric acid solution, carrying out ultrasonic treatment for 2-3 h, filtering, washing with deionized water to be neutral, and drying for later use;
s3, putting the graphene nanosheets treated in the step S2 into a reaction kettle, adding an acylating agent into the reaction kettle, carrying out ultrasonic treatment for 20-25 min, filtering out, washing with deionized water to be neutral, and drying for later use;
s4, putting the graphene nanosheets treated in the step S3 into a reaction kettle, adding a catalyst, a ligand, an organic solvent, glycidyl methacrylate and the mixture A obtained in the step S1 into the reaction kettle, maintaining the reaction kettle in a nitrogen environment, heating to keep the temperature in the reaction kettle at 100-120 ℃, performing suction filtration after performing reaction treatment for 20-25 hours, washing with deionized water, and drying to obtain a material B for later use;
s5, weighing the following raw materials in parts by weight: 40-45 parts of silica micropowder, 8-10 parts of talcum powder, 6-8 parts of the material B obtained in the step S4, 1-2 parts of a suspending agent, 3-5 parts of epoxy resin, 1-3 parts of silica sol and 70-75 parts of deionized water;
and S6, putting all the raw materials weighed in the step S5 into a high-speed stirring tank together, and taking out the raw materials after high-speed stirring treatment for 2-2.5 hours.
Further, the adding amount of the dicyclohexylcarbodiimide in the step S1 is 2 times of the total mass of the N-hydroxysuccinimide; and during stirring treatment, the temperature in the reaction kettle is kept at 0-3 ℃.
Further, the mass fraction of the nitric acid solution in the step S2 is 30-35%.
Further, the acylating agent in step S3 is any one of phosphorus pentachloride and phosphorus tribromide; the total mass of the acylating agent is 90-95 times of that of the graphene nanosheets; and controlling the frequency of ultrasonic waves to be 800-850 kHz during ultrasonic treatment.
Further, the catalyst in step S4 is any one of ferrous chloride or ferrous bromide; the ligand is succinic acid; the organic solvent is ethyl acetate; the graphene nanosheet, the catalyst, the ligand, the organic solvent, the glycidyl methacrylate and the mixture A obtained in the step S1 are in a weight ratio of 10-12: 0.2-0.5: 0.5-1: 30-35: 40-45: 2 to 4.
Further, the particle size of the silicon micropowder in the step S5 is 10-40 μm; the suspending agent is clay powder.
Further, in the high-speed stirring treatment in step S6, the rotation speed of the stirring is controlled to be 1800-2000 rpm, and the temperature in the high-speed stirring tank is kept to be 40-45 ℃.
The invention carries out special optimization and improvement on the preparation method of the coating for the sand core, wherein the silicon micropowder is used as a refractory aggregate, the cost of the coating is greatly reduced, the use of special resources is reduced, the cost is saved, the added talcum powder can improve the overall fluidity of the coating, the pinhole defect of a casting is reduced, and the like, in order to further improve the quality and the practicability of the coating, a material B component is specially added and prepared, the material B is a filler modified by taking a graphene nanosheet as a base component, the graphene nanosheet is directly added and used as the filler, the dispersibility is poor, the stability is poor, and the coating quality of the coating is reduced, therefore, the invention firstly prepares a mixture A component by using cyclodextrin and the like, the mixture A component is a mixed liquid containing active components such as cyclodextrin, pyrene molecules and the like, and then mixes the mixture with glycidyl methacrylate and the like to soak and modify the graphene nanosheet, the preparation method has the advantages that the pyrene molecule modified poly glycidyl methacrylate and cyclodextrin are jointly mixed and grafted with the graphene nanosheets, the material B is good in surface activity, good in dispersion uniformity and strong in heat conduction performance, the surface activity is 7.6W/m.k, the filler is added into the coating, the filler can be fully dispersed in a matrix, the binding capacity with epoxy resin is strong, the integral impact resistance, strength and the like of the coating are effectively improved, the heat conduction performance of the coating is obviously improved, heat can be rapidly dissipated and transferred during pouring, the problem of thermal stress concentration is avoided, the problem of cracking and the like is reduced, and the casting quality is improved.
Compared with the prior art, the invention has the following advantages:
the preparation method disclosed by the invention is simple in overall process, reasonable in matching of the steps, low in production cost, safe and environment-friendly, and the prepared coating has good strength and impact resistance, good thermal conductivity and difficulty in cracking, effectively improves the surface precision of the casting, improves the casting quality and has good practical value.
Detailed Description
Example 1
A preparation method of a coating for sand cores for improving casting quality comprises the following steps:
s1, preparing cyclodextrin, ethylenediamine, 2-pyrenebutyric acid, N-hydroxysuccinimide, dimethylaminopyridine and N, N-dimethylformamide according to the weight-volume ratio of 20 g: 70ml, 5g, 2g, 1 g: mixing 360ml of the mixture and putting the mixture into a reaction kettle, adding dicyclohexylcarbodiimide into the reaction kettle, continuously stirring for 3 hours, taking out the mixture, putting the mixture into acetone for precipitation, and then centrifuging the mixture and taking out supernatant to obtain a mixture A for later use;
s2, immersing the graphene nanosheets into a nitric acid solution, carrying out ultrasonic treatment for 2 hours, filtering, washing with deionized water to be neutral, and drying for later use;
s3, putting the graphene nanosheets treated in the step S2 into a reaction kettle, adding an acylating agent into the reaction kettle, carrying out ultrasonic treatment for 20min, filtering out, washing with deionized water to be neutral, and drying for later use;
s4, putting the graphene nanosheets treated in the step S3 into a reaction kettle, adding a catalyst, a ligand, an organic solvent, glycidyl methacrylate and the mixture A obtained in the step S1 into the reaction kettle, keeping the reaction kettle in a nitrogen environment, heating to keep the temperature in the reaction kettle at 100 ℃, performing suction filtration after performing reaction treatment for 20 hours, washing with deionized water, and drying to obtain a material B for later use;
s5, weighing the following raw materials in parts by weight: 40 parts of silicon micropowder, 8 parts of talcum powder, 6 parts of the material B obtained in the step S4, 1 part of suspending agent, 3 parts of epoxy resin, 1 part of silica sol and 70 parts of deionized water;
and S6, putting all the raw materials weighed in the step S5 into a high-speed stirring tank together, and taking out after high-speed stirring treatment for 2 hours.
Further, the adding amount of the dicyclohexylcarbodiimide in the step S1 is 2 times of the total mass of the N-hydroxysuccinimide; the temperature in the reaction kettle is kept at 0 ℃ during the stirring treatment.
Further, the mass fraction of the nitric acid solution in step S2 is 30%.
Further, the acylating agent in step S3 is phosphorus pentachloride; the total mass of the acylating agent is 90 times of that of the graphene nanosheets; and the frequency of the ultrasonic wave is controlled to be 800kHz during ultrasonic treatment.
Further, the catalyst in step S4 is ferrous chloride; the ligand is succinic acid; the organic solvent is ethyl acetate; the graphene nanosheet, the catalyst, the ligand, the organic solvent, the glycidyl methacrylate and the mixture A obtained in the step S1 are in a weight ratio of 10: 0.2: 0.5: 30:40: 2.
further, the particle size of the silicon micropowder in the step S5 is 10-40 μm; the suspending agent is clay powder.
Further, in the high-speed stirring processing described in step S6, the rotation speed of stirring was controlled to 1800 rpm, while the temperature in the high-speed stirring tank was kept at 40 ℃.
Example 2
A preparation method of a coating for sand cores for improving casting quality comprises the following steps:
s1, preparing cyclodextrin, ethylenediamine, 2-pyrenebutyric acid, N-hydroxysuccinimide, dimethylaminopyridine and N, N-dimethylformamide according to the weight-volume ratio of 23 g: 80ml, 6g, 2.6g, 1.3 g: 370ml of the mixture is mixed together and put into a reaction kettle, dicyclohexylcarbodiimide is added into the reaction kettle, the mixture is continuously stirred for 4 hours and then taken out, the mixture is put into acetone for precipitation, and then the mixture is centrifuged to take out supernatant liquid to obtain a mixture A for later use;
s2, immersing the graphene nanosheets into a nitric acid solution, carrying out ultrasonic treatment for 2.5 hours, filtering, washing with deionized water to be neutral, and drying for later use;
s3, putting the graphene nanosheets treated in the step S2 into a reaction kettle, adding an acylating agent into the reaction kettle, performing ultrasonic treatment for 22min, filtering, washing with deionized water to be neutral, and drying for later use;
s4, putting the graphene nanosheets treated in the step S3 into a reaction kettle, adding a catalyst, a ligand, an organic solvent, glycidyl methacrylate and the mixture A obtained in the step S1 into the reaction kettle, keeping the reaction kettle in a nitrogen environment, heating to keep the temperature in the reaction kettle at 110 ℃, performing suction filtration after performing reaction treatment for 23 hours, washing with deionized water, and drying to obtain a material B for later use;
s5, weighing the following raw materials in parts by weight: 42 parts of silicon micropowder, 9 parts of talcum powder, 7 parts of the material B obtained in the step S4, 1.5 parts of suspending agent, 4 parts of epoxy resin, 2 parts of silica sol and 73 parts of deionized water;
and S6, putting all the raw materials weighed in the step S5 into a high-speed stirring tank together, and taking out the raw materials after high-speed stirring treatment for 2.4 hours.
Further, the adding amount of the dicyclohexylcarbodiimide in the step S1 is 2 times of the total mass of the N-hydroxysuccinimide; the temperature in the reaction kettle is kept at 2 ℃ during the stirring treatment.
Further, the mass fraction of the nitric acid solution in the step S2 is 32%.
Further, the acylating agent in step S3 is phosphorus pentachloride; the total mass of the acylating agent is 92 times of that of the graphene nanosheets; and the frequency of the ultrasonic wave is controlled to be 840kHz during ultrasonic treatment.
Further, the catalyst in step S4 is ferrous chloride; the ligand is succinic acid; the organic solvent is ethyl acetate; the graphene nanosheet, the catalyst, the ligand, the organic solvent, the glycidyl methacrylate and the mixture A obtained in the step S1 are in a weight ratio of 11: 0.4: 0.8: 33:42: 3.
further, the particle size of the silicon micropowder in the step S5 is 10-40 μm; the suspending agent is clay powder.
Further, in the high-speed stirring treatment described in step S6, the rotation speed of stirring was controlled to 1900 rpm, while the temperature in the high-speed stirring tank was kept at 42 ℃.
Example 3
A preparation method of a coating for sand cores for improving casting quality comprises the following steps:
s1, cyclodextrin, ethylenediamine, 2-pyrenebutyric acid, N-hydroxysuccinimide, dimethylaminopyridine and N, N-dimethylformamide are added according to the weight-volume ratio of 25 g: 90ml:7g:3g:1.5 g: 380ml of the mixture is mixed together and put into a reaction kettle, then dicyclohexylcarbodiimide is added into the reaction kettle, the mixture is continuously stirred for 5 hours and then taken out, the mixture is put into acetone for precipitation, and then the mixture is centrifuged to take out supernatant liquid to obtain a mixture A for later use;
s2, immersing the graphene nanosheets into a nitric acid solution, then carrying out ultrasonic treatment for 3 hours, filtering out, washing with deionized water to be neutral, and drying for later use;
s3, putting the graphene nanosheets treated in the step S2 into a reaction kettle, adding an acylating agent into the reaction kettle, carrying out ultrasonic treatment for 25min, filtering out, washing with deionized water to be neutral, and drying for later use;
s4, putting the graphene nanosheets treated in the step S3 into a reaction kettle, adding a catalyst, a ligand, an organic solvent, glycidyl methacrylate and the mixture A obtained in the step S1 into the reaction kettle, keeping the reaction kettle in a nitrogen environment, heating to keep the temperature in the reaction kettle at 120 ℃, performing suction filtration after performing reaction treatment for 25 hours, washing with deionized water, and drying to obtain a material B for later use;
s5, weighing the following raw materials in parts by weight: 45 parts of silicon micropowder, 10 parts of talcum powder, 8 parts of the material B obtained in the step S4, 2 parts of suspending agent, 5 parts of epoxy resin, 3 parts of silica sol and 75 parts of deionized water;
and S6, putting all the raw materials weighed in the step S5 into a high-speed stirring tank together, and taking out the raw materials after high-speed stirring treatment for 2.5 hours.
Further, the adding amount of the dicyclohexylcarbodiimide in the step S1 is 2 times of the total mass of the N-hydroxysuccinimide; the temperature in the reaction kettle is kept at 3 ℃ during the stirring treatment.
Further, the mass fraction of the nitric acid solution in step S2 is 35%.
Further, the acylating agent in step S3 is phosphorus tribromide; the total mass of the acylating agent is 95 times of that of the graphene nanosheets; and the frequency of the ultrasonic wave is controlled to be 850kHz during ultrasonic treatment.
Further, the catalyst in step S4 is ferrous bromide; the ligand is succinic acid; the organic solvent is ethyl acetate; the corresponding weight ratio of the graphene nanosheet, the catalyst, the ligand, the organic solvent, the glycidyl methacrylate and the mixture A obtained in the step S1 is 12: 0.5: 1: 35:45: 4.
Further, the particle size of the silicon micropowder in the step S5 is 10-40 μm; the suspending agent is clay powder.
Further, in the high-speed stirring treatment described in step S6, the rotation speed of stirring was controlled to 2000 rpm, while the temperature in the high-speed stirring tank was kept at 45 ℃.
Comparative example 1
In comparison with example 2, this comparative example 1 omits the preparation and subsequent application of mixture A in step S1, except that the process steps are otherwise identical.
Comparative example 2
In comparative example 2, the catalyst, the ligand, the organic solvent, and the glycidyl methacrylate component in step S4 were omitted as compared with example 2, except that the other steps were the same.
Comparative example 3
In comparative example 3, compared with example 2, in step S5, the component B of the material obtained in step S4 was replaced with an equal mass part of a common commercially available graphene nanoplatelet, except that the other steps of the method were the same.
In order to compare the effects of the invention, a 70/140 precision resin binder sand core is selected as an experimental object, then the coating materials corresponding to the above example 2 and comparative examples 1-3 are respectively used for dip coating treatment in the same way, and finally the coated coating is detected, and the specific comparison data is shown in the following table 1:
TABLE 1
| Surface roughness (μm) | Surface dimensional tolerance accuracy rating | Casting yield (%) | High temperature crack resistance | |
| Example 2 | 4.8~7.0 | CT5 | 99.7 | Without cracks |
| Comparative example 1 | 11.3~15.4 | CT7 | 99.0 | Cracks are more obvious |
| Comparative example 2 | 13.6~17.0 | CT8 | 98.6 | Cracks are more obvious |
| Comparative example 3 | 17.1~21.5 | CT10 | 98.0 | Obvious cracks |
As can be seen from the above table 1, the coating prepared by the method of the invention can obviously improve the casting quality and the surface performance of the sand core, and has great popularization and application values and market competitiveness.
Claims (6)
1. The preparation method of the coating for the sand core for improving the casting quality is characterized by comprising the following steps of:
s1, preparing cyclodextrin, ethylenediamine, 2-pyrenebutyric acid, N-hydroxysuccinimide, dimethylaminopyridine and N, N-dimethylformamide according to the weight-volume ratio of 20-25 g: 70-90 ml, 5-7 g, 2-3 g, 1-1.5 g: mixing 360-380 ml together, putting into a reaction kettle, adding dicyclohexylcarbodiimide into the reaction kettle, continuously stirring for 3-5 hours, taking out, putting into acetone for precipitation, centrifuging, and taking out supernatant to obtain a mixture A for later use;
s2, immersing the graphene nanosheets into a nitric acid solution, carrying out ultrasonic treatment for 2-3 h, filtering, washing with deionized water to be neutral, and drying for later use;
s3, putting the graphene nanosheets treated in the step S2 into a reaction kettle, adding an acylating agent into the reaction kettle, carrying out ultrasonic treatment for 20-25 min, filtering out, washing with deionized water to be neutral, and drying for later use;
s4, putting the graphene nanosheets treated in the step S3 into a reaction kettle, adding a catalyst, a ligand, an organic solvent, glycidyl methacrylate and the mixture A obtained in the step S1 into the reaction kettle, maintaining the reaction kettle in a nitrogen environment, heating to keep the temperature in the reaction kettle at 100-120 ℃, performing suction filtration after performing reaction treatment for 20-25 hours, washing with deionized water, and drying to obtain a material B for later use;
s5, weighing the following raw materials in parts by weight: 40-45 parts of silica micropowder, 8-10 parts of talcum powder, 6-8 parts of the material B obtained in the step S4, 1-2 parts of a suspending agent, 3-5 parts of epoxy resin, 1-3 parts of silica sol and 70-75 parts of deionized water;
s6, putting all the raw materials weighed in the step S5 into a high-speed stirring tank together, and taking out the raw materials after high-speed stirring treatment for 2-2.5 hours;
in the step S6, the rotation speed of stirring is controlled to be 1800-2000 rpm during the high-speed stirring treatment, and the temperature in the high-speed stirring tank is kept to be 40-45 ℃.
2. The method of claim 1, wherein the amount of dicyclohexylcarbodiimide added in step S1 is 2 times the total mass of N-hydroxysuccinimide; and during stirring treatment, the temperature in the reaction kettle is kept at 0-3 ℃.
3. The method for preparing the coating for the sand core for improving the casting quality as claimed in claim 1, wherein the mass fraction of the nitric acid solution in the step S2 is 30-35%.
4. The method of claim 1, wherein the acylating agent in step S3 is any one of phosphorus pentachloride and phosphorus tribromide; the total mass of the acylating agent is 90-95 times of that of the graphene nanosheets; and controlling the frequency of ultrasonic waves to be 800-850 kHz during ultrasonic treatment.
5. The method for preparing the coating for the sand core for improving the casting quality according to claim 1, wherein the catalyst in the step S4 is any one of ferrous chloride or ferrous bromide; the ligand is succinic acid; the organic solvent is ethyl acetate; the graphene nanosheet, the catalyst, the ligand, the organic solvent, the glycidyl methacrylate and the mixture A obtained in the step S1 are in a weight ratio of 10-12: 0.2-0.5: 0.5-1: 30-35: 40-45: 2 to 4.
6. The method for preparing the coating for the sand core for improving the casting quality according to claim 1, wherein the particle size of the silica powder in the step S5 is 10-40 μm; the suspending agent is clay powder.
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