CN105312484B - A kind of silica sand surface pre-treating process and its application - Google Patents
A kind of silica sand surface pre-treating process and its application Download PDFInfo
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- CN105312484B CN105312484B CN201410268309.9A CN201410268309A CN105312484B CN 105312484 B CN105312484 B CN 105312484B CN 201410268309 A CN201410268309 A CN 201410268309A CN 105312484 B CN105312484 B CN 105312484B
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Abstract
The invention discloses a kind of silica sand surface pre-treating process and its application, belong to casting silica sand preconditioning technique field.The pretreating process includes the surface preparation of washing process heating, drying and dries vibrations classification, and pretreating agent used percentage composition composition by weight is：Film forming agent 1~5%；Coupling agent 0.3~1.5%；Dispersant 0.2~0.7%；Solvent is 92.8~98.5%.The present invention improves the intensity of core by one layer of organic film of silica sand Surface coating, strengthening the bonding force of silica sand and resin.The sand core strength that silica sand after treatment is used for cold-box process preparation is significantly improved, and can reduce the addition of resin, improves cost.This technique is not only simple, and cost is low, easy to control, significantly improves the quality of silica sand.
Description
Technical field
The present invention relates to casting silica sand preconditioning technique field, and in particular to a kind of silica sand surface pre-treating process and its
Using sand core strength obtained by cold box process can be improved.
Background technology
Dioxide-containing silica is high in natural silica Sand, with it is heat-resist, grain type is regular the features such as, be the important of casting sand type
Material.At present, resin is mixed as bonding agent with natural silica Sand using cold-box process in foundary industry, under curing agent effect
The hardening of casting compound is set to obtain hard solid cast sand (core) pattern.Silica sand used in cold box process requires higher, because
This is before mixed resin sand, it usually needs silica sand is pre-processed.Existing is the physics for changing silica sand to the mesh that roughing sand is pre-processed
State, reduces the impurity on silica sand surface, is allowed to be more suitable for shell moulded casting.In current industrial production common pretreatment have washing,
Clean, dry, change the surface state such as pickling of roughing sand, high-temperature roasting.There are some defects in these methods, after WATER-WASHING METHOD processing
Roughing sand is higher containing mud, can only meet common casting demand.Acid wash complex process, and acid-resistant system is needed, while acids is also
Expensive and shortage.High-temperature roasting can remove the impurity on silica sand surface but roasting can consume substantial amounts of raw material, causes air pollution.It is cold
The widely used resin adhesive of core box core production method has phenolic resin, polyisocyanate resin and epoxy resin etc..After solidification
Sand mould needs certain mechanical strength, to ensure that pattern is not damaged by carrying or casting cycle.Current sand mould is improved
The method of intensity mainly has：1st, the consumption of resin is increased, 2, when resin and natural silica Sand are mixed add coupling agent, these methods
In the presence of some defects, increase resin demand can increase the gas forming amount of pattern, influence surface quality of continuous castings and increase production cost,
And the coupling agent added when resin and natural silica Sand are mixed does not add the interface in resin and natural silica Sand, reduce
The efficiency of coupling agent, intensity increase is not notable.
The content of the invention
In view of the shortcomings of the prior art part, the invention provides a kind of silica sand surface pre-treating process and its should
With, the technique uses silica sand surface pretreatment agent, and it is pre-processed before natural silica Sand and mixed with resin to natural silica Sand,
The resin amount in the intensity of sand mould, reduction molding sand can be improved, and cost is low, energy resource consumption is small, to molding sand gas forming amount
Influence is small.
Technical solution of the present invention is as follows：
A kind of silica sand surface pre-treating process, the technique is carried out at washing and heating, drying successively first to silica sand (roughing sand)
Reason, is then pre-processed in silica sand surface spraying silica sand surface pretreatment agent to it, (is divided by shaking packet again after drying
Level), the pockets of silica sand of bonding is opened in shake, so as to obtain the silica sand after surface preparation；Wherein：Weight percentage, institute
State silica sand surface pretreatment agent composition 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 in polyethylene glycol, starch and water-soluble epoxy resin
One or more；The coupling agent be silane coupler, can for ethylamino trimethoxysilane coupling agent (KH-550),
γ-glycidyl ether oxygen propyl trimethoxy silicane (KH-560) or γ-methacryloxypropyl trimethoxy silane
(KH-570)；Described dispersant be anion surfactant, can for dodecyl sodium sulfate, sodium cetanesulfonate,
One or more in PAMA and sodium alkyl sulfate；Described solvent is water or polar solvent, polar solvent
It can be acetone or alcohol.
After being washed to silica sand (roughing sand), silica sand water content is higher, it is necessary to carry out heating, drying processing, unwatering.
Silica sand temperature control is at 80~110 DEG C after heating, drying processing.
During to silica sand surface spraying silica sand surface pretreatment agent, the quantity for spray of silica sand is set according to specific requirement.After processing
Silica sand carry compared with Gao Yuwen, by the solvent in remaining temperature drying and processing agent, leave active ingredient.
The silica sand obtained through above-mentioned silica sand surface pre-treating process is prepared into core applied to cold box process.
The present invention principle be：Using surface conditioning agent in one layer of organic film of silica sand Surface coating, change the table of silica sand
Face chemical property, improves the bonding force of silica sand and resin, improves the intensity of core.Film forming agent after dissolving in a solvent can be very
It is good in silica sand surface spreading.Film forming agent needs to dissolve in a heated condition, and heating-up temperature is preferably at 98 DEG C or so.Film forming agent exists
Silica sand surface is directly contacted with resin, and film forming agent will have influence on the mechanical property of sand mold to the adhesion of silica sand.Due to resin with
The adhesion of film forming agent is stronger than the adhesion of resin and silica sand, so sand mold (core) the mould intensity after processing can be improved.Film forming agent
The hole on silica sand surface can also be blocked, resin soakage is reduced.Coupling agent forms chemical bond between silica sand and resin, carries
The intensity of high sand mold.Dispersant can strengthen the dispersiveness and adhesion of film forming agent and silica sand.
Advantages of the present invention is as follows：
1st, the silica sand after present invention processing, one layer of organic film of Surface coating changes silica sand surface chemically
Matter.The bonding force of reinforced resin and silica sand, improves the intensity of core.Organic film can block the hole on silica sand surface simultaneously
Gap, it is possible to reduce the soakage of resin, saves production cost.
2nd, roughing sand intensity is significantly improved after handling, it is possible to reduce the addition of resin in core, reduces production cost, is saved
The energy.
Brief description of the drawings：
Fig. 1 is silica sand surface pre-treating process flow chart.
Embodiment
The present invention is described in detail below in conjunction with drawings and Examples.In following examples, the cold box resin component one is phenol
Urea formaldehyde, the cold box resin component two is PIC.
As shown in figure 1, silica sand surface pre-treating process flow of the present invention is：To natural silica Sand washing process-heating, drying-
Inorganic agent configuration-surface preparation-drying-vibrations are classified, i.e., after roughing sand heating, drying, and spraying equipment is increased in silica sand exit,
Roughing sand is surface-treated, the solvent on remaining temperature drying roughing sand after then being heated using roughing sand.Again by vibrations classification, shake
The pockets of roughing sand of pine bonding.Roughing sand Surface coating organic film after processing, making the bonding force of resin and roughing sand increases.So as to carry
The intensity of high core.Concrete technology is as follows：
(1) roughing sand washing process：It is rinsed in the flushing device being put into first to mined silica sand, removes silica sand
Surface major part impurity.
(2) heating, drying：Silica sand water content after washing is higher, it is necessary to be thermally dried, unwatering.Exit silicon
Sand temperature control is at 100-120 DEG C.
(3) inorganic agent is configured：The component and percetage by weight of inorganic agent be：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, described
Coupling agent is silane coupler, and described dispersant is anion surfactant, and described solvent is water or polar solvent.Press
Weight fraction accurately weighs each component and put into reactor, and heating stirring is mixed, and heating and temperature control is at 90-98 DEG C.Treat
After solid is completely dissolved, stirring is cooled to room temperature, obtains silica sand surface pretreatment agent, standby.
(4) organic surface preparation is set up：Spraying equipment is set up in firing equipment exit, by silica sand surface pretreatment agent
Pour into spraying equipment, organic surface preparation is carried out to roughing sand.The quantity for spray of roughing sand is set according to specific requirement.
(5) dry：Silica sand after processing is carried compared with Gao Yuwen, by the solvent in remaining temperature drying and processing agent, is left effectively
Composition.
Embodiment 1
Silica sand specification：50-100 mesh；Silica sand surface pretreatment agent composition is following (wt.%):
Each component is added in reactor, agitator is opened and is heated to 98 DEG C of dissolvings.Until completely dissolved, stop adding
Heat, continues to mix and is 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, is put into puddle mixer, adds the 14g of cold box resin component one,
The 14g of component two, startup puddle mixer is blended 3min and obtains resin sand." 8 " block tension sand is prepared on core shooter with the resin sand
Core.Test intensity.
Through the pretreated silica sand of above-mentioned pretreating agent, when resin amount is 1.4%, tensile strength is 2.54MPa.Tree
Tensile strength is 2.05MPa when fat addition is 0.9%.
Comparative example 1
Take granularity same as Example 1 but without the baked sand 2kg of the preprocessing process of embodiment 1, be put into puddle mixer, plus
Enter the 14g of cold box resin component one, the 14g of component two, startup puddle mixer is blended 3min and obtains resin sand.With the resin sand in core shooting
" 8 " block tension core is prepared on machine.Test intensity.
Untreated baked sand tensile strength when resin amount is 1.4% is 2.02MPa.Resin amount is
1.7% tensile strength is 2.50MPa.
Comparative example 1 and comparative example 1：The interfacial adhesion strength of silica sand and resin is improved after present invention processing, and then
Improve the tensile strength of core.With baked sand contrast in the case of same resin addition, sand core strength is improved
25.98%.In the case where reaching same intensity, the silica sand after processing can reduce by 35% resin amount, reduce casting
This is caused, the gas forming amount 35% of core is reduced, the pernicious gas produced during casting is reduced, the environment for both having reduced foundry is dirty
Dye, also improves the quality of casting.
Embodiment 2
Silica sand specification：50-100 mesh；Silica sand surface pretreatment agent composition is following (wt.%):
Each component is added in reactor, agitator is opened and is heated to 98 DEG C of stirring and dissolvings.After to be dissolved, filter out not
The solid being completely dissolved, you can obtain pretreating agent.
Learn from else's experience the silica sand 2kg after the processing of above-mentioned inorganic agent, is put into puddle mixer, adds the 14g of cold box resin component one, group
Divide two 14g, startup puddle mixer is blended 3min and obtains resin sand." 8 " block tension core is prepared on core shooter with the resin sand.
Test intensity.
Through the pretreated silica sand of above-mentioned pretreating agent, when resin amount is 1.4%, tensile strength is 2.63MPa.Tree
Tensile strength is 2.07MPa when fat addition is 0.9%.
Comparative example 2
Take granularity same as Example 1 but without the baked sand 2kg of the preprocessing process of embodiment 1, be put into puddle mixer, plus
Enter the 14g of cold box resin component one, the 14g of component two, startup puddle mixer is blended 3min and obtains resin sand.With the resin sand in core shooting
" 8 " block tension core is prepared on machine.Test intensity.
Untreated baked sand tensile strength when resin amount is 1.4% is 2.05MPa.Resin amount is
Tensile strength when 1.8% is 2.66MPa.
Comparative example 2 and comparative example 2：The interfacial adhesion strength of silica sand and resin after present invention processing is improved, and is made
After resin sand core, intensity contrast during with baked sand same resin addition improves 28.29%.Reaching identical intensity
In the case of can reduce by 30% or so resin amount, reduce casting cost, reduce the gas forming amount of core, when reducing casting
The pernicious gas of generation, improves the quality of casting.
Claims (7)
1. a kind of silica sand surface pre-treating process, it is characterised in that：Baking is washed and heated successively first to the technique to silica sand
Dry-cure, is then pre-processed in silica sand surface spraying silica sand surface pretreatment agent to it, passes through vibrations point after drying again
The pockets of silica sand of bonding is opened in level, shake, so as to obtain the silica sand after surface preparation；Wherein：Weight percentage, it is described
Silica sand surface pretreatment agent composition is 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, it is characterised in that：Described film forming agent is water-soluble high
Molecule；The coupling agent is silane coupler；Described dispersant is anion surfactant；Described solvent is that polarity is molten
Agent, the polar solvent is water, acetone or alcohol.
3. silica sand surface pre-treating process according to claim 2, it is characterised in that：The water soluble polymer is poly- second
One or more in glycol, starch and water-soluble epoxy resin；The coupling agent is KH-550, KH-560 or KH-570；Institute
It is one kind in dodecyl sodium sulfate, sodium cetanesulfonate, PAMA and sodium alkyl sulfate to state dispersant
Or it is several.
4. silica sand surface pre-treating process according to claim 1, it is characterised in that：The heating, drying processing procedure
In, temperature control is at 80~110 DEG C.
5. silica sand surface pre-treating process according to claim 1, it is characterised in that：To silica sand surface spraying silica sand surface
During pretreating agent, quantity for spray is set according to specific requirement.
6. silica sand surface pre-treating process according to claim 1, it is characterised in that：Silica sand surface spraying silica sand surface is pre-
Silica sand band after inorganic agent is had a surplus temperature, by the solvent in remaining temperature drying and processing agent, leaves active ingredient.
7. the application of silica sand surface pre-treating process according to claim 1, it is characterised in that：To in advance it locate through silica sand surface
Silica sand after reason PROCESS FOR TREATMENT prepares core applied to cold box process.
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| 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 |
| DE102018200607A1 (en) | 2018-01-15 | 2019-07-18 | Reinsicht Gmbh | Process for the production of molds and cores suitable for the manufacture of fiber composite bodies or castings of metal or plastic, mold bases and binders usable in the process and molds and cores produced by the process |
| CN112548030B (en) * | 2019-09-24 | 2022-09-13 | 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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| CN102241828B (en) * | 2010-08-23 | 2012-12-26 | 蒙特集团（香港）有限公司 | Manufacturing method of wet silicon carbide sand material for solar wafer linear cutting |
| CN102351449B (en) * | 2011-06-29 | 2013-01-09 | 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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