CN104741509A - Preparation method of sand core using polyvinyl alcohol as binder - Google Patents
Preparation method of sand core using polyvinyl alcohol as binder Download PDFInfo
- Publication number
- CN104741509A CN104741509A CN201310723222.1A CN201310723222A CN104741509A CN 104741509 A CN104741509 A CN 104741509A CN 201310723222 A CN201310723222 A CN 201310723222A CN 104741509 A CN104741509 A CN 104741509A
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- Prior art keywords
- polyvinyl alcohol
- sand
- binder
- mixed
- added
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a preparation method of a sand core using polyvinyl alcohol as a binder. The preparation method comprises the following steps: (1) crude sand is added into a sand mixer; the sand mixer is started for mixing; then, binder polyvinyl alcohol is added and mixed for 1 min; a hard accelerator is added and mixed for 1 min; and the sand is discharged; and (2) the mixed molding sand is impacted for three times on an SAC hammering machine to produce the sand core; and CO2 gas is blown for 100 s with a flow of 1 m<3>/h to harden gas so as to obtain the sand core. Calcium hydroxide has the characteristic of reaction heating to accelerate the dehydration hardening and the dispersion distribution of polyvinyl alcohol to improve the strength for CO2 hardened polyvinyl alcohol adhesive; added 425# silicate cement is obvious in effect of improving the moisture absorption and the strength; added water hard materials also have obvious reinforcing effect on the strength; the addition of the hard accelerator greatly improves the hardness of the binder after the air blowing; and the process strength of the sand core mixed with the binder is improved.
Description
Technical field
The present invention relates to a kind of preparation method of core, being specifically related to a kind of take polyvinyl alcohol as the preparation method of the core of binding agent.
Background technology
Foundary industry is high, a heavy-polluted industry of energy consumption, and while development foundry industry, the protection of environment becomes more and more important.In Foundry Production, Modeling Material directly affects the quality of foundry goods, is also one of pollution sources of Foundry Production simultaneously.Traditional cold core box process, as SO
2method, triethylamine set process etc. often adopt poisonous and hazardous gas as catalyst or curing agent, are not only detrimental to health, are also unfavorable for that Green foundry is produced.Polyvinyl alcohol is organic high molecular compound, is a kind of water-soluble resin, can be used as casting binder.But use polyvinyl alcohol adhesive merely, wet strength is low, therefore need together to use with some accelerator for hardening.
Summary of the invention
The object of the invention is to, providing a kind of take polyvinyl alcohol as the preparation method of the core of binding agent, and adding of accelerator for hardening has increased substantially the hardenability of binding agent after air blowing, and the process ruggedness being mixed into the core of binding agent is improved.
Described take polyvinyl alcohol as the preparation method of the core of binding agent, and it comprises the following steps:
One, add in puddle mixer by roughing sand, start puddle mixer and stir, then add binding agent polyvinyl alcohol, mixed 1min processed, adds accelerator for hardening, then shakes out after mixed 1min processed;
Two, the molding sand after mixed stirring is impacted 3 times on SAC paddle type mill machine, make core, then with 1m
3the flow of/h is blown into CO
2gas 100s carries out gas hardening, obtains core.
Provided by the invention take polyvinyl alcohol as the preparation method of the core of binding agent, and its beneficial effect is, calcium hydroxide is to CO
2sclerosis polyvinyl alcohol adhesive has the feature that reaction heating promotes polyvinyl alcohol dehydration sclerosis, Dispersed precipitate improves intensity, adds 425
#portland cement is obvious to improving hygroscopicity and improving intensity effect, the hydraulic material added also has obvious humidification to intensity, adding of accelerator for hardening has increased substantially the hardenability of binding agent after air blowing, and the process ruggedness being mixed into the core of binding agent is improved.
Detailed description of the invention
Below in conjunction with an embodiment, to provided by the invention be that the preparation method of the core of binding agent is described in detail with polyvinyl alcohol.
Embodiment
One, add in puddle mixer by roughing sand, start puddle mixer and stir, then add binding agent polyvinyl alcohol, mixed 1min processed, adds accelerator for hardening, then shakes out after mixed 1min processed;
Two, the molding sand after mixed stirring is impacted 3 times on SAC paddle type mill machine, make core, then with 1m
3the flow of/h is blown into CO
2gas 100s carries out gas hardening, obtains core.
Claims (1)
1. be a preparation method for the core of binding agent with polyvinyl alcohol, it is characterized in that: it comprises the following steps:
One, add in puddle mixer by roughing sand, start puddle mixer and stir, then add binding agent polyvinyl alcohol, mixed 1min processed, adds accelerator for hardening, then shakes out after mixed 1min processed;
Two, the molding sand after mixed stirring is impacted 3 times on SAC paddle type mill machine, make core, then with 1m
3the flow of/h is blown into CO
2gas 100s carries out gas hardening, obtains core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310723222.1A CN104741509A (en) | 2013-12-25 | 2013-12-25 | Preparation method of sand core using polyvinyl alcohol as binder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310723222.1A CN104741509A (en) | 2013-12-25 | 2013-12-25 | Preparation method of sand core using polyvinyl alcohol as binder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104741509A true CN104741509A (en) | 2015-07-01 |
Family
ID=53582083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310723222.1A Pending CN104741509A (en) | 2013-12-25 | 2013-12-25 | Preparation method of sand core using polyvinyl alcohol as binder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104741509A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105537523A (en) * | 2016-02-22 | 2016-05-04 | 江苏钜源机械有限公司 | Method for casting double-end blind hole part at negative pressure through evanescent mode |
-
2013
- 2013-12-25 CN CN201310723222.1A patent/CN104741509A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105537523A (en) * | 2016-02-22 | 2016-05-04 | 江苏钜源机械有限公司 | Method for casting double-end blind hole part at negative pressure through evanescent mode |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150701 |
|
| WD01 | Invention patent application deemed withdrawn after publication |