CN100503081C - Adhesive for casting mold, manufacturing core and method of manufacturing the same - Google Patents
Adhesive for casting mold, manufacturing core and method of manufacturing the same Download PDFInfo
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- CN100503081C CN100503081C CNB2006100472154A CN200610047215A CN100503081C CN 100503081 C CN100503081 C CN 100503081C CN B2006100472154 A CNB2006100472154 A CN B2006100472154A CN 200610047215 A CN200610047215 A CN 200610047215A CN 100503081 C CN100503081 C CN 100503081C
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- sand
- glycol
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- xylitol
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Abstract
A cohesion agent for casting module and making core is provided, which is characterized in that: the mass per centage ration of the main chemical component of the cohesion agent is SiO2, 23 to 31, K2O 0.5 to 28, Na2O 1 to 21, modifying agent 0.5 to 21 and excess water. Wherein, the modifying agent chooses one or two in sorbierite, xylitol, mannite, maltitol, glycol, propanediol, glycerol, pentaerythritol, diglycol, propylene glycol, carbowax, PPG and polyglycerol, the adding volume is 0.5 to 21 per cent. When using the cohesion agent to prepare sand mole core, the dosage is little, the old sand can be recycled and the prepared core has good collapse performance.
Description
Technical field:
The present invention relates to foundry engieering, a kind of foundry sand type (core) binding agent is provided especially.The invention still further relates to the preparation method of this sand mold (core) binding agent.
Background technology:
At present, all kinds of foundry goods of foundry industry extensive use self-hardening sand explained hereafter.The moulding binding agent branch that adopts: manually synthetic organic binder bond and inorganic binder, the organic binder bond system comprises: acid cure phenolic resins self-hardening sand, acid-curing furan resin self-hardening sand, amine solidify the urethane resin self-hardening sand, ester solidifies the alkalescent phenol resin self-hardening sand.Wherein furan resin self curing sand is wider at China's application surface, about 8～100,000 tons with furane resins of annual China production castings.These technologies discharge aborning and comprise: formaldehyde, amine, SO
2, harmful substance such as isocyanide root, dioxin, furans, cause environmental pollution.Wherein, furans is listed the list of 12 kinds of noxious materials in " about the Convention of Stockholm of persistence organic pollutant " in.Enter 21st century, the whole world is more and more paid attention to the sustainable development of economy and the protection of environment.The use of artificial synthetic poisonous organic binder bond will be restricted.
Inorganic binder mainly contains phosphate and sodium silicate water glass, and phosphate sand mold intensity is low, uses less at present.Nineteen fifty-two CO
2Sodium silicate water glass sand is introduced foundry industry, and obtains extensive use, and China's Foundry Production year consumes more than 30 ten thousand tons of sodium silicate water glass at present.The most of employing blown CO
2Technology.This fresh water (FW) glass addition is up to 6～8%, and after type, the core cast, collapsibility is bad, the casting cleaning difficulty, and casting quality is bad, and old sand can not regeneration.Produce foundry goods per ton and on average need 3～4 tons of silica sands; Because old sand can not regeneration, only makes floor sand usefulness on a small quantity, average foundry goods per ton is thrown away 1.5～3 tons of antiquated sands.Cause the waste of silica sand resource, contain the alkali antiquated sand simultaneously and discharge in a large number, cause environmental pollution as solid waste.
Nineteen sixty-eight ester sodified water glass sand appearance increases substantially water-glass sand intensity.Add dextrin, sugar, molasses, sodium polyacrylate, polypropylene acid amide, sodium phosphate trimer, cellulose, humic acid, sodium humate, hydrogenated glucose, xylitol etc. in the modified water glass that provides among Chinese invention patent ZL 99 I 12955.5 and carry out modification, significantly improved the mechanical property of sodium silicate water glass sand mold.And the waterglass addition can reduce to 2.5～3.0%, and old sand can 80% reuse.
Chinese invention patent CN1712153A provides a kind of moulding sand binder, in sodium silicate water glass, add peo resin, borax and sugar alcohol, can be applicable to ester and solidify sodium silicate sand, and enumerated the application in fresh sand, the waterglass addition is 2.2～2.8%.Application number is 200610045711.6 Chinese invention patent application in addition, and a kind of novel sodium silicate binder is provided, by regulating K
+, Na
+The ion ratio improves the waterglass chemical property.Above technology has all been made bigger contribution to the application technology that improves sodium silicate binder, and 90% above old sand can regeneration, but collapsibility is far below the level of using resin self-setting sand, and the collapsibility of raising self-setting silicate process is still its key problem in technology.
Summary of the invention:
The object of the present invention is to provide a kind of casting and molding, binder for core making and its preparation method, during with this adhesive preparation sand core, its consumption is few, the recyclable utilization of old sand, and prepared core has good collapsibility performance.
The invention provides a kind of casting and molding, binder for core-making, it is characterized in that this binding agent is to be made after compound by potassium silicate, sodium metasilicate, sodium potassium silicate, potassium hydroxide, NaOH and modifier, the main chemical compositions mass percent is:
K
2O 0.5～27
Na
2O 1～21
SiO
2 23～31
Modifier 0.5～21
Water surplus
The modifier that the present invention adds is: one or more of dextrin, sugar, molasses, sodium polyacrylate, polypropylene acid amide, sodium phosphate trimer, cellulose, humic acid, sodium humate, xylitol, sorbierite, maltitol, sweet mellow wine, ethylene glycol, propane diols, glycerine, pentaerythrite, diethylene glycol (DEG), dipropylene glycol, polyethylene glycol, polypropylene glycol, polyglycerol, lithium hydroxide, addition is 0.5～21%.In addition, the above-mentioned modifier of the present invention preferably is selected from xylitol, sorbierite, maltitol or sweet mellow wine.
The invention provides a kind of preparation method of above-mentioned binding agent, it is characterized in that: will add pressure pan by solid potassium silicate, potassium hydroxide, sodium silicate solid, NaOH, solid sodium potassium silicate, modifier and the water of quality proportioning weighing, feed steam and be warmed up to 158 ℃～169 ℃, temperature retention time 1h～8h.After treating to dissolve fully, putting into basin, is binding agent of the present invention through press filtration or the transparent liquid of precipitation generation.
The present invention also provides the preparation method of another above-mentioned binding agent, it is characterized in that: raw material is that industrial liquid potassium silicate, liquid sodium silicate, liquid silicic acid potassium sodium, potassium hydroxide, NaOH, modifier and water add reactor, stir, adjust the mass percent of water, be cooled to the normal temperature discharging, be binding agent of the present invention.
Can adopt washing natural silica Sand, artificial silica sand, Reshaping Silica Sand, zircon sand, forsterite sand, chromite sand with casting binder moulding provided by the invention, coremaking.The also regeneration old sand of available these roughing sand.
The proportioning of sand compound is: foundry sand is 99～92%, binding agent 1～8%.Optimum proportioning is: foundry sand 98.5～95%.Binding agent is 1.5～5%.Hardening process can adopt and blow CO
2Hardening process, VRH hardening process, organic ester hardening method, microwave heating method, baking hardening method etc.
At present, what be worthy to be popularized most is the organic ester hardening method, is example to adopt natural washing silica sand, and the suitable proportioning of sand compound is: washing silica sand 96～98.2%, binding agent 1.8～4%, organic ester 0.3～0.5%.Organic ester can adopt triacetyl glycerine, two acetoglycerides, glycerol acetate, diethylene glycol acetate, carbonic ester, polyalcohol organic acid esters and composition thereof.
The present invention has following advantage:
1, binding agent of the present invention, addition is low, intensity is high, molding soon, crush, method for curing can not adopt and blow CO
2Method.VRH method and ester hardening process are particularly useful for ester sclerosis self-hardening sand.Can realize digital control ester sclerosis self-hardening sand molding, coremaking production line, form the large-scale production of foundry goods.
2, when being used for ester and solidifying self-hardening sand, collapsibility is fine, and residual compression strength is solidified self-hardening sand from ester in the past〉2.0Mpa drops to 0.3～0.6Mpa.
3, the core gas forming amount is low, does not contain N, S, P element.Can significantly reduce bleb, crackle, abnormal nodularizing shortcoming.
4, can be used for the production of various casting alloy foundry goods.As: cast iron, cast steel, cast copper, cast aluminium.
When 5, core was poured into a mould, the waterglass film had thermoplasticity, can reduce thermal fragmentation defect, reduced loss due to spoiled work, reduced the repair welding rate, thereby improved casting quality.
6, cast back core collapsibility is good, is easy to desanding, does not need the quick-fried sand of asking of water, thereby stopped the casting crack defective that causes because of water is quick-fried.
7, old sand is easy to regeneration, uses the mechanical property of 100% old sand to be better than using fresh sand, has realized recycling of roughing sand.
8, strong to roughing sand adaptability, can adopt: the waterglass ester curing process regenerating used sand of natural washing silica sand, natural scouring silica sand, selected silica sand, artificial sand, shaping sand, zircon sand, chromite sand, forsterite sand, borolon sand and these roughing sand.
9, do not discharge SO in the production process
2, SO
3, harmful substance such as formaldehyde, amine, benzene, dioxin, isocyanide root, furans, solid waste is few, helps environmental protection.
10, the present invention is the best substitute technology of furan resin self curing sand and other poisonous organic binder bonds.
The specific embodiment
Reinforced proportioning computational methods:
1, with one of sodium metasilicate, potassium silicate and sodium potassium silicate or all regulate SiO in the binding agent
2Mass percent.
2, with sodium metasilicate and one of NaOH and sodium potassium silicate or all regulate and calculate Na in the binding agent
2The O mass percent;
3, calculate K in the binding agent with one of potassium silicate, potassium hydroxide and sodium potassium silicate or whole the adjusting
2The O mass percent.
4, use the mass percent of the gross mass of xylitol, sorbierite, maltitol, sweet mellow wine, ethylene glycol, propane diols, glycerine, pentaerythrite, diethylene glycol (DEG), dipropylene glycol, polyethylene glycol, polypropylene glycol, polyglycerol, lithium hydroxide as modifier.
5, deducting 1+2+3+4 raw material gross mass percentage with 100 is the mass percent of adding water, is the moisture content that should take off if get negative.
Embodiment 1
With the industrial solid sodium metasilicate, Gu-1 type 338kg, the potassium hydroxide 13.3kg of content 75%, the NaOH 140kg of content 73.6%, sorbierite 8kg, ethylene glycol 1kg, polypropylene glycol 1kg, water 500kg add pressure pan, feed steam, slowly be warmed up to 158 ℃, between 158 ℃～169 ℃, be incubated 2h, put into basin, precipitation 72h, clarified solution is emitted, be binding agent of the present invention, be designated as A1, and list it in table 1.
Its chemical analysis mass percent is:
SiO
2 23
Na
2O 20
K
2O 1
Modifier 1
Water 54%
Embodiment 2
The industrial solid sodium metasilicate is consolidated-1 type 353kg, potassium hydroxide 53kg, contained N
2O 73.6%, NaOH 102kg, xylitol 10kg, propane diols 3kg, polypropylene glycol 2kg, glycerine 4kg, polyglycerol 1kg, sorbierite 20kg, water 500kg add pressure pan, feed steam, slowly be warmed up to 158 ℃, between 158 ℃～169 ℃, be incubated 2h, put into basin, precipitation 72h emits clarified solution, is binding agent of the present invention, be designated as A2, and list it in table 1.
SiO
2 24％
K
2O 4％
Na
2O 15％
Water 53%
Modifier 4%
This binding agent is designated as A2, lists table 1 in
Embodiment 3
With industrial solid sodium potassium silicate II type 379kg, NaOH 142kg, potassium hydroxide 20kg, xylitol 15kg, sorbierite 20kg, maltitol 20kg, sweet mellow wine 10kg, pentaerythrite 2kg, diethylene glycol (DEG) 3kg, water 530kg add pressure pan, feed steam, slowly be warmed up to 158 ℃, between 158 ℃-169 ℃, be incubated 2h, put into basin, precipitation 72h emits clarified solution, is binding agent of the present invention, be designated as A3, and list it in table 1.
Embodiment 4
With industrial solid potassium silicate 203kg, solid sodium potassium silicate III type 200kg, NaOH 142kg, potassium hydroxide 208kg, xylitol 30kg, sorbierite 70kg, water 370kg add pressure pan, feed steam, slowly be warmed up to 158 ℃, between 158 ℃-169 ℃, be incubated 2h, put into basin, precipitation 72h emits clarified solution, is binding agent of the present invention, be designated as A4, and list it in table 1.
Embodiment 5
With industrial solid sodium potassium silicate II type 410kg, NaOH 20kg, potassium hydroxide 37kg, sorbierite 120kg, water 530kg add pressure pan, feed steam, slowly be warmed up to 158 ℃, between 158 ℃-169 ℃, be incubated 2h, put into basin, precipitation 72h emits clarified solution, is binding agent of the present invention, be designated as A5, and list it in table 1.
Embodiment 6
With industrial solid sodium potassium silicate III type 444kg, NaOH 41kg, potassium hydroxide 100kg, xylitol 150kg, water 275kg add pressure pan, feed steam, slowly be warmed up to 158 ℃, between 158 ℃～169 ℃, be incubated 2h, put into basin, precipitation 72h emits clarified solution, is binding agent of the present invention, be designated as A6, and list it in table 1.
Embodiment 7
With industrial solid sodium potassium silicate II type 440kg, NaOH 7kg, dipropylene glycol 5kg, xylitol 70kg, sorbierite 95kg, water 383kg add pressure pan, feed steam, slowly be warmed up to 158 ℃, between 158 ℃-169 ℃, be incubated 2h, put into basin, precipitation 72h emits clarified solution, is binding agent of the present invention, be designated as A7, and list it in table 1.
Embodiment 8
Industrial solid sodium potassium silicate II type 230kg, industrial solid potassium silicate IV type 230kg, NaOH 56kg, xylitol 100kg, sorbierite 110kg, water 274kg are added pressure pan, feed steam, slowly be warmed up to 158 ℃, between 158 ℃-169 ℃, be incubated 2h, put into basin, precipitation 72h, clarified solution is emitted, be binding agent of the present invention, be designated as A8, and list it in table 1.
Embodiment 9
Industrial liquid sodium potassium silicate III-2 type 824kg, potassium hydroxide 156kg, sorbierite 20kg are added reactor, stir, be cooled to 50 ℃ with bottom discharge.Get binding agent and be designated as A9, list table 1 in.
Comparative Examples 10
With industrial liquid sodium metasilicate-5 type 930kg, potassium hydroxide 25kg, NaOH 45kg add reactor, stir, and are cooled to 50 ℃ with bottom discharge.Get binding agent and be designated as A10, list table 1 in.
Table 1
Embodiment 11
1000g is detected binding agent add in the SHY type blade mixer with normal sand, add triacetyl glycerine 4g, mix 2min, add binding agent A1 30g in the embodiment of the invention 1, mixed 1min shakes out, and makes standard " 8 " type sample with standard method.Sample is placed different time SWY type hydraulic universal strength-testing machine, and test sample tensile strength, molding sand proportion and intensity see Table 2.
Embodiment 12～20
Do experiment respectively with binding agent A2, A3, A4, A5, A6, A7, A8, A9, A10, test method is with reference to embodiment 11, and lists experimental condition and result in table 2
25 ℃ of RH60% of table 2 temperature
Embodiment 21
Getting ester sodified water glass sand old sand is embodiment 21 through centrifugal bump and mechanical lapping secondary reclaimed sand and uses sand.The sand mix material proportioning is: regenerating water-glass old sand sand 1000g, and triacetyl glycerine 4g adds in the SHY type blade mixer and mixes 2min, adds binding agent A1 25g and mixes 1.0min, and standard " 8 " type sample is made in discharging.Sample is placed different time, and with SWY type hydraulic universal strength-testing machine, test sample tensile strength, molding sand proportion and intensity see Table 3.
Embodiment 22～30,
Get experimental example 2-10 binding agent A2, A3, A4, A5, A6, A7, A8, A9, A10 test method respectively with reference to embodiment 21, result of the test is listed table 3 in
Table 3
Embodiment 31
Mix system waterglass ester curing agent self-hardening sand compound according to embodiment 11,12,21,22,23,24,25,26,27,28,30, make Φ 50 * 50mm standard resistance to compression sample respectively, room temperature vulcanizing 24h.Chamber type electric resistance furnace is heated up 600 ℃, 800 ℃, place sample 30min respectively for 1000 ℃, take out cool to room temperature, survey residual compression strength with universal hydraulic testing machine.The numerical value of surveying is listed table 4 in.
The residual compression strength of table 4 (Mpa)
| The sand proportioning | 600℃ | 800℃ | 1000℃ | Remarks |
| Embodiment 11 | 0.40 | 0.60 | 0.70 | |
| Embodiment 12 | 030 | 0.55 | 0.60 | |
| Embodiment 21 | 0.45 | 0.65 | 0.80 | |
| Embodiment 22 | 0.38 | 0.59 | 0.75 | |
| Embodiment 23 | 0.36 | 0.57 | 0.71 | |
| Embodiment 24 | 0.35 | 0.56 | 0.69 | |
| Embodiment 25 | 035 | 0.55 | 0.70 | |
| Embodiment 26 | 0.32 | 0.51 | 0.65 | |
| Embodiment 27 | 0.30 | 0.48 | 0.61 | |
| Embodiment 28 | 0.19 | 0.35 | 0.45 | |
| Embodiment 29 | 0.43 | 0.62 | 0.78 | |
| Embodiment 30 | 0.55 | 2.12 | 1.10 | Do not add modifier |
Claims (7)
1, a kind of casting and molding, binder for core-making is characterized in that the mass percent of binding agent main chemical compositions is: SiO
223～31
K
2O 0.5～28
Na
2O 1～21
Modifier 0.5～21
Water surplus
Wherein modifier is selected from one or more of sorbierite, xylitol, sweet mellow wine, maltitol, ethylene glycol, propane diols, glycerine, pentaerythrite, diethylene glycol (DEG), dipropylene glycol, polyethylene glycol, polypropylene glycol, polyglycerol, addition 0.5～21%.
2, the described casting and molding of a kind of claim 1, the preparation method of binder for core-making, it is characterized in that: with the industrial solid sodium metasilicate, the industrial solid potassium silicate, the industrial solid sodium potassium silicate, potassium hydroxide, NaOH, sorbic acid, xylitol, sweet mellow wine, maltitol, ethylene glycol, propane diols, glycerine, pentaerythrite, diethylene glycol (DEG), dipropylene glycol, polyethylene glycol, polypropylene glycol, polyglycerol and water are raw material, according to the accurate weighing of proportioning accurate Calculation, add in the pressure pan, feeding is steam heated to 158～169 ℃, insulation 1～8h, treat all to emit after the dissolving, get binding agent through press filtration or natural sedimentation.
3, the preparation method of the described casting and molding of a kind of claim 1, binder for core-making, it is characterized in that: with industrial liquid sodium metasilicate, liquid silicic acid potassium, industrial liquid sodium potassium silicate, NaOH, potassium hydroxide, sorbierite, xylitol, sweet mellow wine, maltitol, ethylene glycol, propane diols, glycerine, pentaerythrite, diethylene glycol (DEG), dipropylene glycol, polyethylene glycol, polypropylene glycol, polyglycerol is raw material, according to the accurate weighing of proportioning accurate Calculation, add reactor and stir, be cooled to normal temperature and get binding agent.
4, the described binding agent of claim 1 is used for common washing natural silica Sand, cleans natural silica Sand, selected natural silica Sand, Reshaping Silica Sand, zircon sand, chromite sand, the moulding of forsterite sand, coremaking.
5, the described binding agent of claim 1 is used for moulding, the coremaking that the waterglass ester solidifies self-hardening sand regeneration sand.
6, a kind of casting core, the proportioning of sand compound be, foundry sand is 99～92%, and binding agent 1～8% is characterized in that the mass percent of binding agent main chemical compositions is:
SiO
2 23～31
K
2O 0.5～28
Na
2O 1～21
Modifier 0.5～21
Water surplus
Wherein modifier is selected from one or more of sorbierite, xylitol, sweet mellow wine, maltitol, ethylene glycol, propane diols, glycerine, pentaerythrite, diethylene glycol (DEG), dipropylene glycol, polyethylene glycol, polypropylene glycol, polyglycerol, addition 0.5～21%.
7, according to the described casting core of claim 6, the proportioning that it is characterized in that the sand compound is a foundry sand 98.5～95%, and binding agent is 1.5～5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100472154A CN100503081C (en) | 2006-07-18 | 2006-07-18 | Adhesive for casting mold, manufacturing core and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100472154A CN100503081C (en) | 2006-07-18 | 2006-07-18 | Adhesive for casting mold, manufacturing core and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101108407A CN101108407A (en) | 2008-01-23 |
| CN100503081C true CN100503081C (en) | 2009-06-24 |
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Families Citing this family (17)
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| CN101947637B (en) * | 2010-08-18 | 2012-10-10 | 沈阳汇亚通铸造材料有限责任公司 | Modified sodium silicate binder for cold core box and preparation thereof |
| CN103143672B (en) * | 2011-12-06 | 2015-07-15 | 重庆汇亚通铸造材料有限公司 | Method for preparing water glass used for foundry by using waste sand of alkaline phenolic resin self-hardening sand |
| CN103588490B (en) * | 2013-10-11 | 2016-06-22 | 铜陵市经纬流体科技有限公司 | CO is blown in anti-moisture absorption2Gas hardened sodium silicate sand and preparation method thereof |
| CN104139153B (en) * | 2014-07-28 | 2016-08-17 | 宁国市大泉机械有限公司 | A kind of environment-friendlymolding molding sand |
| CN104226890B (en) * | 2014-09-30 | 2016-06-22 | 济南圣泉集团股份有限公司 | The waterglass reinforcing agent of casting and preparation method |
| CN104439041A (en) * | 2014-10-20 | 2015-03-25 | 沈阳汇亚通铸造材料有限责任公司 | Core-making sand composition of warm core box and sand making method |
| KR101527909B1 (en) * | 2014-12-16 | 2015-06-10 | 한국생산기술연구원 | inorganic binder composition for castings |
| KR101515572B1 (en) * | 2015-01-20 | 2015-04-29 | 주식회사 디알액시온 | Manufacturing method of core and casting product using inorganic binder |
| CN105057566B (en) * | 2015-07-28 | 2017-05-17 | 宁夏共享化工有限公司 | Novel liquid curing agent used for 3D sand mold printing inorganic binder and preparation method of novel liquid curing agent |
| CN106799461B (en) * | 2016-12-26 | 2018-12-07 | 华中科技大学 | A kind of casting mold three-dimensional spray printing manufacturing process |
| CN108672648A (en) * | 2018-06-12 | 2018-10-19 | 济南赛维机械设备有限公司 | A kind of casting sand type binder, preparation method and application |
| CN108658566B (en) * | 2018-06-14 | 2020-11-10 | 郑州远东耐火材料有限公司 | Preparation method of environment-friendly sodium silicate-bonded sand section material for producing fused zirconia-corundum bricks |
| CN109108212A (en) * | 2018-10-10 | 2019-01-01 | 内蒙古第机械集团股份有限公司 | A kind of environmental protection casting modified organic ester and preparation method |
| CN109439203B (en) * | 2018-10-15 | 2021-04-20 | 湖南镭目科技有限公司 | Adhesive and preparation method thereof |
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| CN112317680A (en) * | 2020-11-07 | 2021-02-05 | 郑州远东耐火材料有限公司 | Composite resin adhesive for sand mold of electric melting alumina brick, preparation method and sand mold material produced by composite resin adhesive |
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Assignee: Chongqing Huiyatong Co., Ltd. Assignor: Shenyang Huiyatong Foundry Material Co., Ltd. Contract fulfillment period: 2009.6.30 to 2015.6.30 contract change Contract record no.: 2009210000173 Denomination of invention: Adhesive for casting mold, manufacturing core and method of manufacturing the same Granted publication date: 20090624 License type: Exclusive license Record date: 2009.7.8 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.6.30 TO 2015.6.30; CHANGE OF CONTRACT Name of requester: CHONGQING HUIYATONG CASTING MATERIALS CO., LTD. Effective date: 20090708 |
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Granted publication date: 20090624 Termination date: 20160718 |