CN108405794B - A kind of hot core sand inorganic binder and preparation method thereof - Google Patents
A kind of hot core sand inorganic binder and preparation method thereof Download PDFInfo
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- CN108405794B CN108405794B CN201810202036.6A CN201810202036A CN108405794B CN 108405794 B CN108405794 B CN 108405794B CN 201810202036 A CN201810202036 A CN 201810202036A CN 108405794 B CN108405794 B CN 108405794B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
- B22C1/183—Sols, colloids or hydroxide gels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
- B22C1/185—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents containing phosphates, phosphoric acids or its derivatives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
- B22C1/186—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents contaming ammonium or metal silicates, silica sols
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- Mold Materials And Core Materials (AREA)
Abstract
The present invention provides a kind of hot core sand inorganic binder and preparation method thereof, the hot core sand inorganic binder includes following component and its weight percent: phosphoric acid 50~53%, aluminium hydroxide 11~12%, boric acid 1.87~2.50%, silicic acid 0.89~0.92%, magnesia 1.14~1.57%, copper oxide 0.05~0.07%, water 32~34%.The hot core sand inorganic binder of gained of the invention is non-toxic and tasteless pollution-free, viscosity is low, it is had preferable mobility after being mixed with sand, meet the production requirement of hot box shoot core machine, the sand mold or sand core stability obtained after being heating and curing is good, tensile strength is high, and product has broad application prospects, and economic benefit and social benefit are significant.
Description
Technical field
The invention belongs to casting industry field, in particular to a kind of hot core sand inorganic binder and preparation method thereof.
Background technique
Automobile gray iron casting sand mold or sand core at present mainly be film-covering sand hot corebox core production method and three second
Amine cold box process is molding.What two methods used is organic resin binder, and organic resin binder has been public
The nuisance recognized.Thermal method coremaking be by coated sand inject 200 DEG C or so heat molds in curing molding, production scene due to
Resin is heated to cause biggish smog and release bad smell, although cold process coremaking mold does not heat, due to resin sand
Be it is cured by triethylamine, triethylamine is dispersed into air, and smell is very unpleasant, and it is very severe to also result in working environment, seriously
The health of worker is influenced, in addition either hot core, cold core casting mold or type core, in casting of metals, since resin meets high-temperature metal
Liquid can be thermally decomposed, and gasification, and burning etc. decomposite and release universally acknowledged carcinogenic substance dioxin, will also result in pair
The destruction of environment.
Automobile cylinder cover or cylinder casting sand core structure are generally sufficiently complex, some sand cores are small-sized, it is desirable that and intensity is high,
Such as water channel sand cores, tensile strength require to be greater than 1.8MPa or more, bending strength requires to reach 4MPa or more.Phosphate binders
As a kind of environmentally protective binder, there is nontoxic, scentless feature, thus have for environmental protection development and application in
The possibility in this field.But phosphate binders are there are viscosity height, and sand fluidity is poor, and adhesion strength is also not high enough, the present invention couple
Phosphate binders are modified, and improve cementability, to achieve the purpose that improve the hard sand intensity of phosphate binders heat, are realized
Its application in gray iron casting, achievees the purpose that improve environment.
Summary of the invention
The present invention provides a kind of hot core sand inorganic binder and preparation method thereof, it has adhesion strength high, and viscosity is low, uses
In thermal method coremaking, the advantages that sand fluidity is good, and sand core moisture resistance is good, sand mold intensity stabilization.
The present invention adopts the following technical scheme:
A kind of hot core sand inorganic binder, the hot core sand inorganic binder includes following component and its weight percent:
Phosphoric acid 50~53%, aluminium hydroxide 11~12%, boric acid 1.87~2.50%, silicic acid 0.89~0.92%, magnesia 1.14~
1.57%, copper oxide 0.05~0.07%, water 32~34%.
Preferably, the phosphoric acid is 85% industrial phosphoric acid.
Preferably, the silicic acid is 1000 mesh solid powderies.
Preferably, the magnesia is chemical pure, 600 mesh powder shape substance of granularity.
Preferably, the boric acid is technical grade.
Preferably, the copper oxide is chemical pure, 600 mesh powder shape substance of granularity.
The preparation method of above-mentioned hot core sand inorganic binder, includes the following steps:
(1) phosphoric acid and aluminium-hydroxide powder and water are added in three mouthfuls of reaction kettles, turn on agitator and heater, slowly
It is heated to 180~200 DEG C；
(2) to which after reaction, boric acid is added in reaction kettle in reaction kettle, continue heating, stirring, until in reaction kettle
Solution is transparent；
(3) silicic acid is added, continues heating, stir about 15min, mixing speed can be improved at this time, to improve silicic acid
Dispersion degree, accelerate silicic acid powder dissolution, until reaction kettle in solution it is transparent；
(4) magnesia is added, continues heating, stirring, until solution is transparent in reaction kettle；
(5) copper oxide is added, continues heating, stirring, until solution is transparent in reaction kettle；
(6) it discharges, it is cooling to solution, obtain hot core sand inorganic binder.
The application method of above-mentioned hot core sand inorganic binder mixes sand with the hot core sand inorganic binder in sand mixer
After system, blasting unit is added, penetrates sand mold processed in core shooter, 150~200 DEG C of mould heating-up temperature, sand sample curing molding ejects to obtain the final product
Sand mold or sand core.
The hot core sand inorganic binder of the present invention is applied to hot box shoot core machine and prepares sand mold or sand core, with compared with firmly, mixes
Good sand room temperature is non-sclerous, and only heating could harden, therefore when this binder prepares sand mold or sand core does not need curing agent；With
Thermmohardening is compared with hot-air solidification, requires heat hardening, but molding and core making technique is different, mixed sand is made in compressed air
It injects type chamber in a few seconds under and is compacted, therefore it is required that binder viscosity is low, mixed sand good fluidity.
This binder uses polynary micro composite modified approach, joined micro oxygen while silicic acid is added in component
Change copper, silicic acid reduces the degree of neutralization of binder, keeps binder solution transparent, but sample shelf stability declines, copper oxide
It is added, due to forming complex compound mantoquita, improves sample shelf stability, sample is stored 8 hours under 40% humidity, and tension is strong
Within 10%, some even improves 11% for degree decline.
Hot core sand inorganic binder obtained by technical solution of the present invention is non-toxic and tasteless pollution-free, and viscosity is low, has after mixing with sand
There is preferable mobility, meets the production requirement of hot box shoot core machine, the sand mold or sand core stability obtained after being heating and curing is good,
Tensile strength is high, and product has broad application prospects, and economic benefit and social benefit are significant.
Specific embodiment
To keep the present invention easier to understand, specific embodiments of the present invention are further illustrated below.
The hot core sand inorganic binder synthesis of the phosphate of the present application and sand mold preparating example are as follows:
Example one:
53 kilograms of 85% industrial phosphoric acid, 11 kilograms of aluminium-hydroxide powder, 1.92 kilograms of boric acid, silicic acid 0.89 are weighed in proportion
Kilogram, 1.14 kilograms of magnesia, 0.05 kilogram of copper oxide, 32 kilograms of water.
Preparation step:
1,53 kilograms of industrial phosphoric acids and 11 kilograms of aluminium-hydroxide powders and 32 kg of water are added in three mouthfuls of reaction kettles, are opened
Blender and heater are opened, is slowly heated to 180~200 DEG C；
2, to which after reaction, 1.92 kilograms of boric acid are added in reaction kettle in reaction kettle, continue heating, stirring, until
Solution is transparent in reaction kettle；
3,0.89 kilogram of silicic acid is added, continues heating, stirring, until solution is transparent in reaction kettle；
4, be added 1.14 kilograms of magnesia, continue heating, stirring it is transparent to solution；
5, be added 0.05 kilogram of copper oxide, continue heating, stirring it is transparent to solution；
Discharging, to solution cooling, viscosimetric and for making sand sample.
Mulling and sand mold preparation: preparing 40~70 mesh quartz sands, prepares binder by sand 2.5%, mulling first is added in sand
Machine starts sand mixer, then slowly pours into binder, continue mulling 2 minutes after adding, then shake out.Blasting unit is added in sand,
By compressed air by 160 DEG C of sand injection of mold, it according to sand core thickness, can be opened within about 4~5 minutes, eject sand core.
Part sand is taken to penetrate system " 8 " word sand sample and bending strength sample on testing machine simultaneously, for examining sand mold mobility and sand mold strong
Degree.It penetrates that specimen surface processed is bright and clean, and corner angle are clear, shows that good fluidity, probe intensity are shown in Table 1.
Table 1
Example two:
52 kilograms of 85% industrial phosphoric acid, 11 kilograms of aluminium-hydroxide powder, 2.44 kilograms of boric acid, silicic acid 0.92 are weighed in proportion
Kilogram, 1.57 kilograms of magnesia, 0.07 kilogram of copper oxide, 32 kilograms of water.
Preparation step:
1,52 kilograms of industrial phosphoric acids and 11 kilograms of aluminium-hydroxide powders and 32 kg of water are added in three mouthfuls of reaction kettles, are opened
Blender and heater are opened, is slowly heated to 180~200 DEG C；
2, to which after reaction, 2.44 kilograms of boric acid are added in reaction kettle in reaction kettle, continue heating, stirring, until
Solution is transparent in reaction kettle；
3,0.92 kilogram of silicic acid is added, continues heating, stirring, until solution is transparent in reaction kettle；
4, be added 1.57 kilograms of magnesia, continue heating, stirring it is transparent to solution；
5, be added 0.07 kilogram of copper oxide, continue heating, stirring it is transparent to solution；
Discharging, to solution cooling, viscosimetric and for making sand sample.
Mulling and sand mold preparation: preparing 40~70 mesh quartz sands, prepares binder by sand 3%, sand mixer first is added in sand,
Start sand mixer, then slowly pours into binder, continue mulling 2 minutes after adding, then shake out.Blasting unit is added in sand, is led to
Overcompression air is injected sand in 180 DEG C of mold, according to sand core thickness, can be opened within about 4~5 minutes, ejects sand core.Together
When take part sand to penetrate system " 8 " word sand sample and bending strength sample on testing machine, for examining sand mold mobility and sand mold intensity.
It penetrates that specimen surface processed is bright and clean, and corner angle are clear, shows that good fluidity, probe intensity are shown in Table 2.
Table 2
Example three:
52 kilograms of 85% industrial phosphoric acid, 12 kilograms of aluminium-hydroxide powder, 1.87 kilograms of boric acid, silicic acid 0.90 are weighed in proportion
Kilogram, 1.16 kilograms of magnesia, 0.07 kilogram of copper oxide, 32 kilograms of water.
Preparation step:
1,52 kilograms of industrial phosphoric acids and 12 kilograms of aluminium-hydroxide powders and 32 kg of water are added in three mouthfuls of reaction kettles, are opened
Blender and heater are opened, is slowly heated to 180~200 DEG C；
2, to which after reaction, 1.87 kilograms of boric acid are added in reaction kettle in reaction kettle, continue heating, stirring, until
Solution is transparent in reaction kettle；
3,0.90 kilogram of silicic acid is added, continues heating, stirring, until solution is transparent in reaction kettle；
4, be added 1.16 kilograms of magnesia, continue heating, stirring it is transparent to solution；
5, be added 0.07 kilogram of copper oxide, continue heating, stirring it is transparent to solution；
Discharging, to solution cooling, viscosimetric and for making sand sample.
Mulling and sand mold preparation: preparing 40~70 mesh quartz sands, prepares binder by sand 2.5%, mulling first is added in sand
Machine starts sand mixer, then slowly pours into binder, continue mulling 2 minutes after adding, then shake out.Blasting unit is added in sand,
By compressed air by 175 DEG C of sand injection of mold, it according to sand core thickness, can be opened within about 4~5 minutes, eject sand core.
Part sand is taken to penetrate system " 8 " word sand sample and bending strength sample on testing machine simultaneously, for examining sand mold mobility and sand mold strong
Degree.It penetrates that specimen surface processed is bright and clean, and corner angle are clear, shows that good fluidity, probe intensity are shown in Table 3.
Table 3
Example four:
50 kilograms of 85% industrial phosphoric acid, 11 kilograms of aluminium-hydroxide powder, 2.50 kilograms of boric acid, silicic acid 0.91 are weighed in proportion
Kilogram, 1.52 kilograms of magnesia, 0.07 kilogram of copper oxide, 34 kilograms of water.
Preparation step:
1,50 kilograms of industrial phosphoric acids and 11 kilograms of aluminium-hydroxide powders and 34 kg of water are added in three mouthfuls of reaction kettles, are opened
Blender and heater are opened, is slowly heated to 180~200 DEG C；
2, to which after reaction, 2.50 kilograms of boric acid are added in reaction kettle in reaction kettle, continue heating, stirring, until
Solution is transparent in reaction kettle；
3,0.91 kilogram of silicic acid is added, continues heating, stirring, until solution is transparent in reaction kettle；
4, be added 1.52 kilograms of magnesia, continue heating, stirring it is transparent to solution；
5, be added 0.07 kilogram of copper oxide, continue heating, stirring it is transparent to solution；
Discharging, to solution cooling, viscosimetric and for making sand sample.
Mulling and sand mold preparation: preparing 70~140 mesh quartz sands, prepares binder by sand 3.5%, mulling first is added in sand
Machine starts sand mixer, then slowly pours into binder, continue mulling 2 minutes after adding, then shake out.Blasting unit is added in sand,
By compressed air by 170 DEG C of sand injection of mold, it according to sand core thickness, can be opened within about 4~5 minutes, eject sand core.
Part sand is taken to penetrate system " 8 " word sand sample and bending strength sample on testing machine simultaneously, for examining sand mold mobility and sand mold strong
Degree.It penetrates that specimen surface processed is bright and clean, and corner angle are clear, shows that good fluidity, probe intensity are shown in Table 4.
Table 4
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than protects to the present invention
The limitation of range is protected, although the invention is described in detail with reference to the preferred embodiments, those skilled in the art should
Understand, it can be with modification or equivalent replacement of the technical solution of the present invention are made, without departing from the essence of technical solution of the present invention
And range.
Claims (8)
1. a kind of hot core sand inorganic binder, which is characterized in that the hot core sand inorganic binder includes following component and its again
Amount percentage: phosphoric acid 50 ~ 53%, aluminium hydroxide 11 ~ 12%, boric acid 1.87 ~ 2.50%, silicic acid 0.89 ~ 0.92%, magnesia 1.14 ~
1.57%, copper oxide 0.05 ~ 0.07%, water 32 ~ 34%.
2. hot core sand inorganic binder as described in claim 1, which is characterized in that the phosphoric acid is 85% industrial phosphoric acid.
3. hot core sand inorganic binder as described in claim 1, which is characterized in that the silicic acid is 1000 mesh solid powders
Shape.
4. hot core sand inorganic binder as described in claim 1, which is characterized in that the magnesia is chemical pure, granularity 600
Mesh powder shape substance.
5. hot core sand inorganic binder as described in claim 1, which is characterized in that the boric acid is technical grade.
6. hot core sand inorganic binder as described in claim 1, which is characterized in that the copper oxide is chemical pure, granularity 600
Mesh powder shape substance.
7. the preparation method of hot core sand inorganic binder as claimed in any one of claims 1 to 6, which is characterized in that including as follows
Step:
Phosphoric acid and aluminium-hydroxide powder and water are added in three mouthfuls of reaction kettles, turn on agitator and heater are slowly heated to
180~200℃；
To which after reaction, boric acid is added in reaction kettle in reaction kettle, continue heating, stirring, until solution is in reaction kettle
Transparence；
Silicic acid is added, continues heating, stirring until solution is transparent in reaction kettle；
Magnesia is added, continues heating, stirring, until solution is transparent in reaction kettle；
Copper oxide is added, continues heating, stirring, until solution is transparent in reaction kettle；
Discharging, it is cooling to solution, obtain hot core sand inorganic binder.
8. the application of hot core sand inorganic binder as claimed in any one of claims 1 to 6, which is characterized in that by sand and the heat
Core sand inorganic binder is added blasting unit, penetrates sand mold or sand core processed, mould heating-up temperature in core shooter after sand mixer is blended
150 ~ 200 DEG C, sand sample curing molding ejects up to sand mold or sand core.
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|---|---|---|---|---|
| CN109108211B (en) * | 2018-09-14 | 2020-02-14 | 湖北工业大学 | Cold-process inorganic phosphate precoated sand and preparation method thereof |
| CN109261890B (en) * | 2018-09-29 | 2021-02-19 | 共享智能铸造产业创新中心有限公司 | Printing material for ceramic core, preparation method of printing material and preparation method of ceramic core |
| CN110170612B (en) * | 2019-05-28 | 2020-10-13 | 湖北工业大学 | Method for improving fluidity of inorganic resin molding sand and application method thereof |
| CN110508747A (en) * | 2019-09-17 | 2019-11-29 | 江苏泽恩汽机车部品制造有限公司 | A kind of sand mould casting method |
| CN110625060B (en) * | 2019-10-15 | 2020-11-03 | 湖北工业大学 | Phosphate binder modified by hydroxyethylidene diphosphonic acid and preparation method thereof |
| CN114535499B (en) * | 2021-12-31 | 2023-06-02 | 北京航空航天大学宁波创新研究院 | Moisture absorption resistant inorganic binder powder for casting, activating solution and using method |
| CN115007795A (en) * | 2022-06-09 | 2022-09-06 | 中国航发北京航空材料研究院 | High-strength low-gas-evolution-amount inorganic binder and preparation method and application thereof |
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