CN104959526B - A kind of method of modifying of casting silica sand - Google Patents
A kind of method of modifying of casting silica sand Download PDFInfo
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- CN104959526B CN104959526B CN201510453867.7A CN201510453867A CN104959526B CN 104959526 B CN104959526 B CN 104959526B CN 201510453867 A CN201510453867 A CN 201510453867A CN 104959526 B CN104959526 B CN 104959526B
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Abstract
The invention discloses a kind of method of modifying of casting silica sand, casting is carried out roguing drying with silica sand, is then preheated to 70～75 DEG C, be placed in puddle mixer, add casting silica sand surface modifier, mix homogeneously, obtain modified silica sand.In described casting silica sand surface modifier, mass percent shared by each component is：Carboxymethyl cellulose 1～3%, dodecyl sodium sulfate 0.5～1%, coupling agent 0.1～0.5%, remaining is water.In modifying agent according to the present invention, raw material sources are wide, low cost, safety non-toxic；The activity on silica sand surface can be greatly enhanced, optimize itself bonding efficiency and organic binder bond between；And the method for modifying being related to is simply, gained modification silica sand can keep stable performance for a long time, when being applied to cold-box process coremaking, can significantly reduce required core production cost in casting technique.
Description
Technical field
This patent belongs to the field of surface modification of casting silica sand and in particular to a kind of method of modifying of casting silica sand.
Background technology
The apparent condition of casting silica sand is very big on the impact of whole casting process, therefore needs before mixing with binding agent
Silica sand is surface-treated, typically physical-mechanical method and chemical method is broadly divided into the method for silica sand surface treatment.Physics-
Mechanical Method includes the silica sand of collection is carried out cleaning, magnetic separation, flotation etc., this method major defect is that refining effect is good and consume energy
Greatly.Chemical method is mainly processed with mineral acid and reducing agent, though lifting is had by this method silica sand performance, the chemistry using
Reagent is more, easily to environment and cost remain high.
At present, have tried to using polyvinyl alcohol, silica sand surface be processed, so that silica sand performance is had and to a certain degree lifted,
It is but the performance of silica sand is unstable over time after polyvinyl alcohol modification and affected by environment larger in modifying process,
It is also easy to produce side effect, make silica sand hydraulic performance decline on the contrary.
Content of the invention
It is an object of the invention to provide a kind of method of modifying of casting silica sand, using casting with silica sand modifying agent to silica sand
Carry out surface modification, this modifying agent raw material sources is wide, low cost and safety and environmental protection, can significantly strengthen the activity on silica sand surface, change
Property after silica sand performance keeping stable for a long time, and the production cost of required core in casting technique can be reduced.
For achieving the above object, the technical scheme of present invention offer is：A kind of method of modifying of casting silica sand, it includes
Following steps：Casting is carried out roguing drying with silica sand, is then preheated to 70～75 DEG C, be placed in puddle mixer, add casting to use
Silica sand surface modifier, mixes 70～90s, obtains modified silica sand.
In such scheme, in described casting silica sand surface modifier, mass percent shared by each component is：Carboxymethyl is fine
Dimension element 1～3%, dodecyl sodium sulfate 0.5～1%, coupling agent 0.1～0.5%, remaining is water.
In such scheme, described coupling agent is γ-methacryloxypropyl trimethoxy silane.
In such scheme, its viscosity of described carboxymethyl cellulose is suitable, is configured to 2% aqueous solution (mass concentration)
Viscosity between 0.3～0.6Pa s.Described carboxymethyl cellulose odorless, tasteless, nontoxic, and formation high viscosity soluble in water
Colloid solution, be a kind of good binding agent.
In such scheme, described dodecyl sodium sulfate is a kind of anion surfactant, have excellent dispersion and
Emulsification, can make carboxymethyl cellulose be uniformly dispersed in silica sand surface；Coupling agent is a kind of nonionic surfactant, can
To form chemical bond and silica sand surface and carboxymethyl cellulose between respectively, strengthen both boundary strengths；By dodecyl sulphur
Sour sodium and γ-methacryloxypropyl trimethoxy silane carry out compatibility, can give play to the maximum activity effect of modifying agent.
In such scheme, the preparation method of described casting silica sand surface modifier comprises the following steps：
1) the weighing of raw material, mass percent shared by each component is：Carboxymethyl cellulose 1～3%, dodecyl sodium sulfate
0.5～1%, coupling agent 0.1～0.5%, remaining is water；
2) under 50～60 DEG C of water bath condition, carboxymethyl cellulose is soluble in water under agitation, prepare carboxymethyl
Cellulose aqueous solution, is subsequently cooled to room temperature；
3) weigh and supplement step 2) moisture that gained carboxymethyl cellulose aqueous solution evaporates, then add coupling
Agent, dodecyl sodium sulfate, are mixed and stirred for uniformly, obtaining described casting silica sand surface modifier.
In such scheme, described silica sand is (50～55) with the mass ratio of casting silica sand surface modifier:1.
Cold-box process coremaking just be can be used in more than 24 hours in room temperature dry in the sun according to such scheme gained modification silica sand.
In such scheme, described modifying agent can carry out moditied processing to silica sand surface, activate silica sand surface to greatest extent, make
It is more preferable with the interface compatibility of organic binder bond (resin etc.).
Beneficial effects of the present invention are：
1) raw material sources that modifying agent of the present invention is related to are wide, low cost, and safety non-toxic.
2) modifying agent of the present invention is simple with the modified method of silica sand to casting, and processing procedure environmental protection is no dirty
Dye.
3) modifying agent of the present invention can be greatly enhanced the activity on silica sand surface, optimizes itself and the organic binder bonds such as resin
Between adhesion, the intensity improving gained core simultaneously reduces its gas forming amount；And gained modification silica sand can be in long-time retentivity
Can be stable, when being applied to cold-box process coremaking, required silica sand cost in casting technique can be significantly reduced.
Specific embodiment
In order to be better understood from the present invention, it is further elucidated with present disclosure with reference to specific embodiment, but this
Bright content is not limited solely to the following examples.
In following examples, as no specific instructions, the reagent of employing is commercially available chemical reagent.
Described carboxymethyl cellulose is provided by Hebei Yan Xing Chemical Co., Ltd., model IM6, its 2% aqueous solution (quality
Concentration) viscosity between 0.3～0.6Pa s.
In following examples, resin used is by phenolic resin and isocyanates with 1:1 mass ratio mixes.
Embodiment 1
A kind of method of modifying of casting silica sand, comprises the following steps：Casting is carried out roguing drying with silica sand, then in advance
Heat, to 71 DEG C, is placed in puddle mixer, adds casting silica sand surface modifier (the silica sand and casting matter of silica sand surface modifier
Amount ratio is 50:1), mix 75s, obtain modified silica sand.
In above method of modifying, mass percent shared by each component of described silica sand surface modifier is：Carboxymethyl cellulose
1%, dodecyl sodium sulfate 0.5%, γ-methacryloxypropyl trimethoxy silane 0.2%, remaining is deionization
Water, its preparation method comprises the following steps：1) weigh each raw material by proportioning, under 50 DEG C of water bath condition, by carboxymethyl cellulose
It is dissolved under agitation in deionized water, prepare carboxymethyl cellulose aqueous solution, be subsequently cooled to room temperature；2) weigh and supplement
Step 2) evaporation of gained carboxymethyl cellulose aqueous solution moisture, then add coupling agent, dodecyl sodium sulfate, mixing is simultaneously
Stir.
Application examples
The present embodiment gained modification silica sand is applied to cold core coremaking and carries out contrast experiment, wherein resin with drying roughing sand
Addition be silica sand quality 1.4% (following resin content is the percent accounting for silica sand quality), with same cold core
Standard " 8 " word coupon prepared by sampling machine, is then placed on core and to survey it in drying basin respectively in 0h (during depanning) and 24h
Tensile strength, the results are shown in Table 1.
Table 1 embodiment 1 gained modification silica sand and the tensile strength test result drying roughing sand sample
The above results show, modifying agent of the present invention can be greatly enhanced the activity on silica sand surface, improve silica sand and tree
Adhesion strength between fat.
When the present embodiment gained modification silica sand is made " 8 " word coupon, resin amount reduces to former with drying when 1.2%
Add standby " 8 " the word coupon of 1.4% resin-made in sand to be contrasted, the results are shown in Table 2.
Table 2 reduces the tensile strength comparing result of gained coupon after resin amount in modified silica sand
As can be seen from Table 2, the resin in modified silica sand sample is reduced to 1.2%, its intensity still better than with baked sand its
Resin amount is the sample of 1.4% preparation；Cost accounting result shows, it is possible to decrease about 13% casting technique core cost
(cold-box process coremaking).
Embodiment 2
A kind of method of modifying of casting silica sand, comprises the following steps：Casting is carried out roguing drying with silica sand, then in advance
Heat, to 73 DEG C, is placed in puddle mixer, adds casting silica sand surface modifier (the silica sand and casting matter of silica sand surface modifier
Amount ratio is 52:1), mix 80s, obtain modified silica sand.
In above method of modifying, mass percent shared by each component of described silica sand surface modifier is：Carboxymethyl cellulose
2%, dodecyl sodium sulfate 0.8%, γ-methacryloxypropyl trimethoxy silane 0.4%, remaining is deionization
Water, its preparation method comprises the following steps：1) weigh each raw material by said ratio, under 55 DEG C of water bath condition, carboxymethyl is fine
Dimension element is dissolved in deionized water under agitation, prepares carboxymethyl cellulose aqueous solution, is subsequently cooled to room temperature；2) weigh simultaneously
Supplement step 2) moisture that gained carboxymethyl cellulose aqueous solution evaporates, then add coupling agent, dodecyl sodium sulfate,
It is mixed and stirred for uniformly.
Application examples
The present embodiment gained modification silica sand is used for cold core coremaking and carries out contrast experiment with drying roughing sand, wherein resin
Addition is 1.4% (following resin content is the percent accounting for silica sand quality) of silica sand quality, with same cold core system
Standard " 8 " word coupon prepared by model machine, is then placed on core and surveys its resisting in 0h (during depanning) and 24h in drying basin respectively
Tensile strength, the results are shown in Table 3.
Table 3 embodiment 2 gained modification silica sand and the tensile strength test result drying roughing sand sample
The above results show, modifying agent of the present invention can be greatly enhanced the activity on silica sand surface, improve silica sand and tree
Adhesion strength between fat.
By the present embodiment gained modification silica sand make the resin amount adopting during " 8 " word coupon reduce to when 1.0% with
Add standby " 8 " the word coupon of 1.4% resin-made in drying roughing sand to be contrasted, the results are shown in Table 4.
Table 4 reduces the tensile strength comparing result of gained coupon after resin content in modified silica sand
As can be seen from Table 4, the resin in modified silica sand sample is reduced to 1.0%, its intensity is still than with setting in baked sand
Fat addition is that the sample of 1.4% preparation will height；Pass through to detect that the gas forming amount of this two kinds of samples finds simultaneously, plus 1.0% resin
Modified silica sand sample gas forming amount meansigma methodss be 8.1ml/g, and plus 1.4% resin baked sand sample gas forming amount meansigma methodss
For 10.3ml/g, illustrate that modified silica sand can effectively reduce the gas forming amount of gained core.Further, since the amount of resin adding reduces,
Cost accounting result shows, it is possible to decrease core cost needed for about 26% casting technique (cold-box process coremaking).
Embodiment 3
A kind of method of modifying of casting silica sand, comprises the following steps：Casting is carried out roguing drying with silica sand, then in advance
Heat, to 75 DEG C, is placed in puddle mixer, adds casting silica sand surface modifier (the silica sand and casting matter of silica sand surface modifier
Amount ratio is 55:1), mix 85s, obtain modified silica sand.
In above method of modifying, mass percent shared by each component of described silica sand surface modifier is：Carboxymethyl cellulose
2.5%, dodecyl sodium sulfate 1%, γ-methacryloxypropyl trimethoxy silane 0.5%, remaining is deionization
Water, its preparation method comprises the following steps：
1) each raw material is weighed according to said ratio, under 60 DEG C of water bath condition, by carboxymethyl cellulose under agitation
It is dissolved in deionized water, prepare carboxymethyl cellulose aqueous solution, be subsequently cooled to room temperature；
2) weigh and supplement step 2) moisture that gained carboxymethyl cellulose aqueous solution evaporates, then add coupling
Agent, dodecyl sodium sulfate, are mixed and stirred for uniformly.
Application examples
The present embodiment gained modification silica sand is carried out contrast experiment with drying roughing sand and being used for cold core sample preparation, wherein the adding of resin
Dosage is the 1.4% of silica sand quality, prepares standard " 8 " word coupon with same cold core sampling machine, is then placed on core dry
Its tensile strength in 0h (during depanning) and 24h surveyed respectively by dry ware, the results are shown in Table 5.
Table 5 embodiment 3 gained modification silica sand and the tensile strength test result drying roughing sand sample
The above results show, modifying agent of the present invention can be greatly enhanced the activity on silica sand surface, improve gained resin
The intensity of sand.
By the present embodiment gained modification silica sand make the resin amount adopting during " 8 " word coupon reduce to when 0.9% with
Add standby " 8 " the word coupon of 1.4% resin-made in drying roughing sand to be contrasted, the results are shown in Table 6.
Table 6 reduces the tensile strength comparing result of gained coupon after resin content in modified silica sand
As can be seen from Table 6, the resin in modified silica sand sample is reduced to 0.9%, its intensity is still than added with 1.4% resin
Baked sand sample will height；Cost accounting result shows, it is possible to decrease core cost (cold-box needed for about 32.7% casting technique
Method coremaking).
Modification silica sand manufactured in the present embodiment is stored 30,60,90 days afterwards in sealing and under conditions of drying respectively, so
Sampling adds 0.9% resin to carry out cold core sample preparation afterwards, then core is placed in drying basin and surveys it respectively in 0h (during depanning)
Tensile strength with during 24h, the results are shown in Table 7.
The tensile strength test result of table 7 different times modification silica sand sample
As can be seen from Table 7, modified silica sand performance change in placement process is stable, than with polyvinyl alcohol, silica sand is carried out
Surface treatment the modified silica sand holding time longer (easily lump during with PVOH to silica sand surface preparation, cause sand grains reunion,
During storage, Strength Changes amplitude is big), affected by environment less.
The above results show：Using modifying agent of the present invention to silica sand modifying surface after, significantly enhance silicon
Sand surface and the adhesion of interlaminar resin, thus improve the intensity of core, and can reduce the gas forming amount of core；Should by modified silica sand
For cold-box process coremaking, can effectively reduce the addition of resin, reduce silica sand cost needed for casting technique；And modification silica sand
Performance can keep stable for a long time, suitable popularization and application.
The foregoing is only the preferred embodiment of the present invention it is noted that coming for those of ordinary skill in the art
Say, without departing from the concept of the premise of the invention, make some modifications and variations, these broadly fall into the protection model of the present invention
Enclose.
Claims (5)
1. a kind of method of modifying of casting silica sand is it is characterised in that comprise the following steps：Casting is carried out roguing baking with silica sand
Dry, then it is preheated to 70～75 DEG C, is placed in puddle mixer, add casting silica sand surface modifier, mix 70～90s, must change
Property silica sand；
In described casting silica sand surface modifier, mass percent shared by each component is：Carboxymethyl cellulose 1～3%, 12
Sodium alkyl sulfonate 0.5～1%, coupling agent 0.1～0.5%, remaining is water.
2. method of modifying according to claim 1 is it is characterised in that the viscosity requirement of described cellulose is its mass concentration
The viscosity of the aqueous solution for 2% is between 0.3～0.6Pa s.
3. method of modifying according to claim 1 is it is characterised in that described coupling agent is γ-methacryloxy third
Base trimethoxy silane.
4. method of modifying according to claim 1 is it is characterised in that the described casting preparation side of silica sand surface modifier
Method comprises the following steps：
1) the weighing of raw material, mass percent shared by each component is：Carboxymethyl cellulose 1～3%, dodecyl sodium sulfate 0.5
～1%, coupling agent 0.1～0.5%, remaining is water；
2) under 50～60 DEG C of water bath condition, carboxymethyl cellulose is soluble in water under agitation, prepare carboxymethyl fine
The plain aqueous solution of dimension, is subsequently cooled to room temperature；
3) weigh and supplement step 2) moisture that evaporates of gained carboxymethyl cellulose aqueous solution, be subsequently adding coupling agent, 12
Sodium alkyl sulfonate, is mixed and stirred for uniformly, obtaining described casting silica sand surface modifier.
5. method of modifying according to claim 1 is it is characterised in that described casting silica sand is changed with casting silica sand surface
Property agent mass ratio be (50～55):1.
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| CN105921682A (en) * | 2016-05-26 | 2016-09-07 | 合肥市田源精铸有限公司 | High-air-permeability molding sand and preparation method thereof |
| 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 |
| CN107671235A (en) * | 2017-09-30 | 2018-02-09 | 江苏闽江矿业有限公司 | A kind of quartz sand method of modifying |
| CN107598074A (en) * | 2017-09-30 | 2018-01-19 | 江苏闽江矿业有限公司 | A kind of glass sand method of modifying |
| CN107598075A (en) * | 2017-09-30 | 2018-01-19 | 江苏闽江矿业有限公司 | A kind of silica sand method of modifying |
| CN107598073A (en) * | 2017-09-30 | 2018-01-19 | 江苏闽江矿业有限公司 | A kind of ore in sand form method of modifying |
| CN107686254A (en) * | 2017-09-30 | 2018-02-13 | 江苏闽江矿业有限公司 | A kind of building sand method of modifying |
| 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 |
| CN112743036B (en) * | 2020-12-24 | 2022-06-24 | 南阳仁创再生资源有限公司 | Curing agent for inorganic precoated sand and inorganic precoated sand core containing curing agent |
| CN114799041B (en) * | 2022-05-07 | 2023-08-01 | 安徽大天铸业有限责任公司 | Casting inner runner precoated sand core paint and preparation method thereof |
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| CN100491479C (en) * | 2005-09-15 | 2009-05-27 | 成都理工大学 | Method for producing compound and modified quartz powder by using aluminate ester and methyl acryloxyl silicane |
| CN102206053A (en) * | 2011-03-16 | 2011-10-05 | 内蒙古金迈特建筑材料有限责任公司 | Preparation method for surface-modified quartz sand |
| CN104623973B (en) * | 2014-12-13 | 2016-06-29 | 济南大学 | A kind of Modified Quartz Sand and method of modifying thereof |
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