CN105312484A - Silica sand surface pre-treatment process and application thereof - Google Patents
Silica sand surface pre-treatment process and application thereof Download PDFInfo
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- CN105312484A CN105312484A CN201410268309.9A CN201410268309A CN105312484A CN 105312484 A CN105312484 A CN 105312484A CN 201410268309 A CN201410268309 A CN 201410268309A CN 105312484 A CN105312484 A CN 105312484A
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Abstract
The invention discloses a silica sand surface pre-treatment process and an application thereof and belongs to the technical field of cast-use silica sand pre-treatment. The pre-treatment process includes the steps of water washing treatment, heating and drying, surface pre-treatment, drying and vibration grading. A pre-treatment agent includes, by weight, 1-5% of a film forming agent, 0.3-1.5% of a coupling agent, 0.2-0.7% of a dispersing agent and 92.8-98.5% of a solvent. In the invention, the surface of silica sand is coated by an organic thin film layer to enhance the adhesion force between the silica sand and resin, thereby improving the strength of the silica sand. The treated silica sand can be used for producing a sand core through a cold core box method, wherein the sand core is significantly improved in strength, and can reduce addition amount of resin and reduce cost. The process is simple, is low in cost, is easy to control and significantly improve quality of the silica sand.
Description
Technical field
The present invention relates to casting silica sand preconditioning technique field, be specifically related to a kind of silica sand surface pre-treating process and application thereof, cold box process gained sand core strength can be improved.
Background technology
In natural silica Sand, dioxide-containing silica is high, and having the features such as good heat resistance, grain type be regular, is the important materials of casting sand type.At present, foundary industry adopts cold-box process mixed with natural silica Sand as bonding agent by resin, under curing agent effect, make casting compound harden obtain hard solid-state casting model powder (core) pattern.Cold box process silica sand used requires higher, therefore before mixed resin sand, usually needs to carry out pretreatment to silica sand.Existing is the physical state changing silica sand to the pretreated order of roughing sand, reduces the impurity on silica sand surface, makes it to be more suitable for shell moulded casting.Pretreatment common in current industrial production has washing, scouring, oven dry, changes the surface state of roughing sand as pickling, high-temperature roasting.There are some defects in these methods, after WATER-WASHING METHOD process, roughing sand is higher containing mud, can only meet common casting demand.Acid wash complex process, and need acid-resistant system, acids also expensive and shortage simultaneously.High-temperature roasting can remove the impurity on silica sand surface but roasting can consume a large amount of raw materials, causes air pollution.The widely used resin adhesive of cold box process has phenolic resins, polyisocyanate resin and epoxy resin etc.Sand mould after solidification needs certain mechanical strength, to ensure that in carrying or casting cycle, pattern is not damaged.The method that current sand mould improves intensity mainly contains: the consumption 1, increasing resin, 2, coupling agent is added when resin and natural silica Sand mixing, there are some defects in these methods, increasing resin demand can make the gas forming amount of pattern increase, affect surface quality of continuous castings and increase production cost, and the coupling agent added when resin and natural silica Sand mixing is not added on the interface of resin and natural silica Sand, reduce the efficiency of coupling agent, intensity increase is not remarkable.
Summary of the invention
For the weak point that prior art exists, the invention provides a kind of silica sand surface pre-treating process and application thereof, this technique adopts silica sand surface pretreatment agent, it is carried out pretreatment to natural silica Sand before natural silica Sand and mixed with resin, the intensity of sand mould can be improved, reduce the resin amount in molding sand, and cost is low, energy resource consumption is little, little on the impact of molding sand gas forming amount.
Technical solution of the present invention is as follows:
A kind of silica sand surface pre-treating process, first this technique carry out washing and heating, drying process successively to silica sand (roughing sand), then at silica sand surface spraying silica sand surface pretreatment agent, pretreatment is carried out to it, again by vibrations grouping (classification) after drying, bonding agglomerating silica sand is opened in shake, thus obtains the silica sand after surface preparation; Wherein: weight percentage, described silica sand surface pretreatment agent is composed as follows:
Film forming agent 1 ~ 5%;
Coupling agent 0.3 ~ 1.5%;
Dispersant 0.2 ~ 0.7%;
Solvent 92.8 ~ 98.5%.
Described film forming agent is water soluble polymer, is specifically as follows one or more in polyethylene glycol, starch and water-soluble epoxy resin; Described coupling agent is silane coupler, can be ethylamino trimethoxysilane coupling agent (KH-550), γ-glycidyl ether oxygen propyl trimethoxy silicane (KH-560) or γ-methacryloxypropyl trimethoxy silane (KH-570); Described dispersant is anion surfactant, can be one or more in dodecyl sodium sulfate, sodium cetanesulfonate, PAMA and sodium alkyl sulfate; Described solvent is water or polar solvent, and polar solvent can be acetone or alcohol.
After washing silica sand (roughing sand), silica sand water content is higher, needs to carry out heating, drying process, unwatering.After heating, drying process, silica sand temperature controls at 80 ~ 110 DEG C.
During to silica sand surface spraying silica sand surface pretreatment agent, the quantity for spray of silica sand sets according to specific requirement.Silica sand after process, with comparatively Gao Yuwen, by the solvent in the agent of remaining temperature drying and processing, leaves active ingredient.
The silica sand obtained through above-mentioned silica sand surface pre-treating process is applied to cold box process and prepares core.
Principle of the present invention is: use surface conditioning agent at silica sand Surface coating one deck organic film, change the surface chemical property of silica sand, improve the bonding force of silica sand and resin, the intensity of core is improved.Film forming agent after dissolving in a solvent can well at silica sand surface spreading.Film forming agent needs to dissolve in a heated condition, and heating-up temperature is preferably at about 98 DEG C.Film forming agent is direct and resin contact on silica sand surface, and film forming agent will have influence on the mechanical property of sand mold to the adhesion of silica sand.Because resin is stronger than the adhesion of resin and silica sand with the adhesion of film forming agent, so sand mold (core) the mould intensity after process can improve.Film forming agent can also block the hole on silica sand surface, reduces resin soakage.Coupling agent forms chemical bond between silica sand and resin, improves the intensity of sand mold.Dispersant can be enhanced to dispersiveness and the adhesion of film and silica sand.
Advantage of the present invention is as follows:
1, the silica sand after process of the present invention, Surface coating one deck organic film, changes the chemical property on silica sand surface.Strengthen the bonding force of resin and silica sand, improve the intensity of core.Organic film can block the hole on silica sand surface simultaneously, can reduce the soakage of resin, save production cost.
2, after process, roughing sand intensity significantly improves, and can reduce the addition of resin in core, reduces production cost, economize energy.
Accompanying drawing illustrates:
Fig. 1 is silica sand surface pre-treating process flow chart.
Detailed description of the invention
Below in conjunction with drawings and Examples in detail the present invention is described in detail.In following examples, described cold box resin component one is phenolic resins, and described cold box resin component two is PIC.
As shown in Figure 1, silica sand surface pre-treating process flow process of the present invention is: to natural silica Sand washing process-heating, drying-inorganic agent configuration-surface preparation-drying-vibrations classification, namely after roughing sand heating, drying, spraying equipment is increased in silica sand exit, carry out surface treatment to roughing sand, the remaining temperature after then utilizing roughing sand to heat dries the solvent on roughing sand.Again through vibrations classification, the bonding agglomerating roughing sand of shake pine.Roughing sand Surface coating organic film after process, makes the bonding force of resin and roughing sand increase.Thus improve the intensity of core.Concrete technology is as follows:
(1) roughing sand washing process: the flushing device that the silica sand first splitting extraction is put into rinses, removes the most of impurity in silica sand surface.
(2) heating, drying: the silica sand water content after washing is higher, needs to carry out heat drying, unwatering.Exit silica sand temperature controls at 100-120 DEG C.
(3) configuration process agent: the component of inorganic agent and percetage by weight are: film forming agent: 1%-5%; Coupling agent: 0.3%-1.5%; Dispersant: 0.2%-0.7%; Solvent is 92.8%-98.5%.Described film forming agent is water soluble polymer, and described coupling agent is silane coupler, and described dispersant is anion surfactant, and described solvent is water or polar solvent.Mark accurately takes each component and puts in reactor by weight, and heating stirs and evenly mixs, and heating and temperature control is at 90-98 DEG C.After solid dissolves completely, stir and be cooled to room temperature, obtain silica sand surface pretreatment agent, for subsequent use.
(4) set up organic surface preparation: set up spraying equipment in firing equipment exit, silica sand surface pretreatment agent is poured in spraying equipment, organic surface preparation is carried out to roughing sand.The quantity for spray of roughing sand sets according to specific requirement.
(5) dry: the silica sand after process, with comparatively Gao Yuwen, by the solvent in the agent of remaining temperature drying and processing, leaves active ingredient.
Embodiment 1
Silica sand specification: 50-100 order; Silica sand surface pretreatment agent (wt.%) composed as follows:
Each component is joined in reactor, opens agitator and be heated to 98 DEG C of dissolvings.Until completely dissolved, stopping is heated, and continues to mix to be cooled to room temperature.Filter out undissolved polyvinyl alcohol and can obtain pretreating agent.
Silica sand 2kg after above-mentioned pre-treatment treatment of learning from else's experience, puts into puddle mixer, adds cold box resin component one 14g, component two 14g, starts the mixed 3min processed of puddle mixer and obtains resin sand.On core shooter, " 8 " block tension core is prepared with this resin sand.Test intensity.
Be 2.54MPa through the pretreated silica sand of above-mentioned pretreating agent tensile strength when resin amount is 1.4%.When resin amount is 0.9%, tensile strength is 2.05MPa.
Comparative example 1
Get with embodiment 1 same particle sizes but without the baked sand 2kg of embodiment 1 preprocessing process, put into puddle mixer, add cold box resin component one 14g, component two 14g, starting the mixed 3min processed of puddle mixer and obtain resin sand.On core shooter, " 8 " block tension core is prepared with this resin sand.Test intensity.
Untreated baked sand tensile strength when resin amount is 1.4% is 2.02MPa.Resin amount be 1.7% tensile strength be 2.50MPa.
Comparative example 1 and comparative example 1: the interfacial adhesion strength that improve silica sand and resin after process of the present invention, and then the tensile strength improving core.Contrast when same resin addition with baked sand, sand core strength improves 25.98%.When reaching same intensity, the silica sand after process can reduce by the resin amount of 35%, reduces casting cost, reduce the gas forming amount 35% of core, the pernicious gas produced when reducing casting, had both decreased the environmental pollution of foundry, had also improved the quality of foundry goods.
Embodiment 2
Silica sand specification: 50-100 order; Silica sand surface pretreatment agent (wt.%) composed as follows:
Each component is joined in reactor, opens agitator and be heated to 98 DEG C of stirring and dissolving.After to be dissolved, filter out not consoluet solid, can pretreating agent be obtained.
Learn from else's experience the silica sand 2kg after above-mentioned inorganic agent process, puts into puddle mixer, add cold box resin component one 14g, component two 14g, starts the mixed 3min processed of puddle mixer and obtain resin sand.On core shooter, " 8 " block tension core is prepared with this resin sand.Test intensity.
Be 2.63MPa through the pretreated silica sand of above-mentioned pretreating agent tensile strength when resin amount is 1.4%.When resin amount is 0.9%, tensile strength is 2.07MPa.
Comparative example 2
Get with embodiment 1 same particle sizes but without the baked sand 2kg of embodiment 1 preprocessing process, put into puddle mixer, add cold box resin component one 14g, component two 14g, starting the mixed 3min processed of puddle mixer and obtain resin sand.On core shooter, " 8 " block tension core is prepared with this resin sand.Test intensity.
Untreated baked sand tensile strength when resin amount is 1.4% is 2.05MPa.Tensile strength when resin amount is 1.8% is 2.66MPa.
Comparative example 2 and comparative example 2: the silica sand after process of the present invention and the interfacial adhesion strength of resin improve, and after making resin sand core, the intensity contrast with during baked sand same resin addition, improves 28.29%.Reaching the resin amount that can to reduce about 30% under identical strength conditions, reduce casting cost, reduce the gas forming amount of core, the pernicious gas produced when reducing casting, improves the quality of foundry goods.
Claims (7)
1. a silica sand surface pre-treating process, it is characterized in that: first this technique wash and heating, drying process successively to silica sand, then at silica sand surface spraying silica sand surface pretreatment agent, pretreatment is carried out to it, again by vibrations classification after drying, bonding agglomerating silica sand is opened in shake, thus obtains the silica sand after surface preparation; Wherein: weight percentage, described silica sand surface pretreatment agent is composed as follows:
Film forming agent 1 ~ 5%;
Coupling agent 0.3 ~ 1.5%;
Dispersant 0.2 ~ 0.7%;
Solvent 92.8 ~ 98.5%.
2. silica sand surface pre-treating process according to claim 1, is characterized in that: described film forming agent is water soluble polymer; Described coupling agent is silane coupler; Described dispersant is anion surfactant; Described solvent is water or polar solvent, and polar solvent can be acetone or alcohol.
3. silica sand surface pre-treating process according to claim 2, is characterized in that: described water soluble polymer is one or more in polyethylene glycol, starch and water-soluble epoxy resin; Described coupling agent is KH-550, KH-560 or KH-570; Described dispersant is one or more in dodecyl sodium sulfate, sodium cetanesulfonate, PAMA and sodium alkyl sulfate.
4. silica sand surface pre-treating process according to claim 1, is characterized in that: in described heating, drying processing procedure, temperature controls at 80 ~ 110 DEG C.
5. silica sand surface pre-treating process according to claim 1, is characterized in that: during to silica sand surface spraying silica sand surface pretreatment agent, quantity for spray sets according to specific requirement.
6. silica sand surface pre-treating process according to claim 1, is characterized in that: the silica sand band after silica sand surface spraying silica sand surface pretreatment agent is had a surplus temperature, by the solvent in the agent of remaining temperature drying and processing, leaves active ingredient.
7. the application of silica sand surface pre-treating process according to claim 1, is characterized in that: the silica sand after the process of silica sand surface pre-treating process is applied to cold box process and prepares core.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107325469A (en) * | 2017-06-26 | 2017-11-07 | 安徽安顺硅基玻璃原料有限公司 | A kind of silica sand pretreating agent and its application |
| CN112166000A (en) * | 2018-01-15 | 2021-01-01 | 莱茵特有限公司 | Method for producing moulds and cores suitable for producing fibre composites or cast parts made of metal or plastic, moulding base material and binding agent that can be used in said method, and moulds and cores produced according to said method |
| CN112548030A (en) * | 2019-09-24 | 2021-03-26 | 沈阳铸造研究所有限公司 | Surface treatment method of silica sand for casting sand core ink-jet 3D printing |
| CN114700459A (en) * | 2022-03-21 | 2022-07-05 | 陈攀 | Method for accelerating paint drying by using residual heat of V-normal molding sand |
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| JPH0576984A (en) * | 1991-03-19 | 1993-03-30 | Sumitomo Durez Co Ltd | Self-curing binder for mold and manufacture thereof |
| CN102241828A (en) * | 2010-08-23 | 2011-11-16 | 蒙特集团（香港）有限公司 | Manufacturing method of wet silicon carbide sand material for solar wafer linear cutting |
| CN102351449A (en) * | 2011-06-29 | 2012-02-15 | 合肥工业大学 | Nonionic surfactant-modified machine-made sand and preparation method thereof |
| CN103272987A (en) * | 2013-04-16 | 2013-09-04 | 繁昌县恒鑫汽车零部件有限公司 | Molding sand manufactured from silica sand as main material and manufacturing method thereof |
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2014
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Patent Citations (4)
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| JPH0576984A (en) * | 1991-03-19 | 1993-03-30 | Sumitomo Durez Co Ltd | Self-curing binder for mold and manufacture thereof |
| CN102241828A (en) * | 2010-08-23 | 2011-11-16 | 蒙特集团（香港）有限公司 | Manufacturing method of wet silicon carbide sand material for solar wafer linear cutting |
| CN102351449A (en) * | 2011-06-29 | 2012-02-15 | 合肥工业大学 | Nonionic surfactant-modified machine-made sand and preparation method thereof |
| CN103272987A (en) * | 2013-04-16 | 2013-09-04 | 繁昌县恒鑫汽车零部件有限公司 | Molding sand manufactured from silica sand as main material and manufacturing method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107325469A (en) * | 2017-06-26 | 2017-11-07 | 安徽安顺硅基玻璃原料有限公司 | A kind of silica sand pretreating agent and its application |
| CN112166000A (en) * | 2018-01-15 | 2021-01-01 | 莱茵特有限公司 | Method for producing moulds and cores suitable for producing fibre composites or cast parts made of metal or plastic, moulding base material and binding agent that can be used in said method, and moulds and cores produced according to said method |
| CN112548030A (en) * | 2019-09-24 | 2021-03-26 | 沈阳铸造研究所有限公司 | Surface treatment method of silica sand for casting sand core ink-jet 3D printing |
| CN114700459A (en) * | 2022-03-21 | 2022-07-05 | 陈攀 | Method for accelerating paint drying by using residual heat of V-normal molding sand |
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