CN102366812B - A kind of preparation method of sodium silicate sand used for casting - Google Patents

A kind of preparation method of sodium silicate sand used for casting Download PDF

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Publication number
CN102366812B
CN102366812B CN201110307628.2A CN201110307628A CN102366812B CN 102366812 B CN102366812 B CN 102366812B CN 201110307628 A CN201110307628 A CN 201110307628A CN 102366812 B CN102366812 B CN 102366812B
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China
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sand
accounts
water glass
composite modifier
casting
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CN201110307628.2A
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Chinese (zh)
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CN102366812A (en
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许立新
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华文蔚
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Abstract

The invention discloses a kind of preparation method of sodium silicate sand used for casting, the method comprises preparation modified water glass and prepares molding sand two steps, wherein configure modified water glass and adopt composite modifier, described composite modifier is made up of talcum powder, starch, POLYPROPYLENE GLYCOL, nano alumina powder, wherein with composite modifier total amount for benchmark talcum powder accounts for 35-50%, starch accounts for 6-12%, and POLYPROPYLENE GLYCOL accounts for 14-18%, and nano alumina powder accounts for 25-35%.And the molding sand of invention improves intensity, and improve collapsibility.

Description

A kind of preparation method of sodium silicate sand used for casting
Technical field
The present invention relates to casting field, particularly water-glass sand sand casting field.
Background technology
Waterglass is that a kind of people know, ancient moulding, coremaking nontoxic, tasteless, Green foundry inorganic binder, Foundry Production is introduced (see BP from the 1950's, GB782205), the applicating history of more than 50 year is had so far.Water-glass sand serviceability is flexibly superior, and both mouldable also can coremaking, CO the earliest 2gas hardening cold core box process should belong to waterglass-CO 2method.But, CO 2the greatest problem that hardened sodium silicate sand exists is that after cast, collapsibility is poor, and cast cleaning and reclamation of return sand difficulty, seriously hinder applying of it.
Compare with resin bonded sand mould, many problems such as low modulus water glass sand exists that intensity is low, moisture resistance is poor, collapsibility is bad, cast cleaning and regenerating used reuse difficulty, annoying the time of founder author's decades always, also do not solved preferably so far.
For solving the problems referred to above that low modulus water glass sand exists, China, in considerable time, has carried out a large amount of scientific research work to water-glass sand, but has made a breakthrough not yet.Reason is that people attempt, when low modulus sodium silicate addition is higher, solves Problems existing, but produce little effect by adding the accrete ways such as various organic or inorganic dispersants.Russia Р у с и н а В. В. wait people to propose, in the waterglass compound of modulus≤2.0, add the accrete way of cinder, the adhesion strength of waterglass can be made to improve 5 ~ 10 times, because the modulus of the waterglass adopted is too low, Na 2o content is too high, is not suitable for foundary industry, and is only widely used in building trade.Japan two Yu rise the beautiful intensity waiting people to adopt heating using microwave raising sodium silicate sand core, waterglass addition in sand is reduced to 1% ~ 2%, reach the object improving sodium silicate sand collapsibility, but the moisture resistance of the core of microwave irradiation is poor, fails aborning to be applied.The people such as Russia Ж у К О В С К И Й have found the basic reason of sodium silicate sand collapsibility difference by test, when he thinks that molten metal high temperature is poured into a mould, water-glass sand under the effect of heat-flash, Na wherein 2o, to the erosion of quartz sand and sintering, forms sintered body.The intensity of this sintered body determines the height of water-glass sand retained strength at normal temperatures.So, reduce the formation volume of sintered body, namely reduce Na 2o, to the erosion of quartz sand and sintering, is the retained strength reducing water-glass sand, improves the basic method of its collapsibility.Therefore, significantly Na in sand is reduced 2the content of O, the i.e. quantity of sodium ion, be only the basic method solving this problem.But long-term production practices show, the adhesion strength of waterglass is low, and the intensity improving water glass type core sand if want just needs the addition strengthening waterglass, correspondingly, its collapsibility also just must be caused poor.So enough hardening strengths and superior both collapsibilities get both if think, the adhesion strength of itself just must be increased considerably on the basis of improving modulus of water glass.
Summary of the invention
For the deficiencies in the prior art, an object of the present invention is the preparation method providing a kind of sodium silicate sand used for casting, to improve the intensity of water-glass sand and to improve its collapsibility.
For achieving the above object, the technical solution used in the present invention is:
A preparation method for sodium silicate sand used for casting, the method comprises the steps:
1) modified water glass is prepared; At room temperature, be 2.5-3.5 at modulus, density is 1.30-1.45g/cm 3waterglass in add the composite modifier accounting for waterglass total amount 8-10%, described composite modifier is made up of talcum powder, starch, POLYPROPYLENE GLYCOL, nano alumina powder, wherein with composite modifier total amount for benchmark talcum powder accounts for 35-50%, starch accounts for 6-12%, POLYPROPYLENE GLYCOL accounts for 14-18%, nano alumina powder accounts for 25-35%, makes modified water glass after stirring evenly;
2) molding sand is prepared: in casting normal sand, add the step 1 accounting for quartz sand 5-6.5%) modified water glass prepared, stir 40-80 minute in puddle mixer after.
The invention has the beneficial effects as follows:
By each component of choose reasonable with collocation composite modifier; make to play synergy between each component; the sand bond prepared by the modified water glass that with the addition of this composite modifier is made to improve more than 40%; and improve the collapsibility of molding sand; only need get final product knockout by dry method vibrations; avoid the quick-fried or water-soluble sand removal of water, cost saving, protection of the environment.
Advantage of the present invention is further illustrated below in conjunction with embodiment.
Detailed description of the invention
Embodiment one
A preparation method for sodium silicate sand used for casting, the method comprises the steps:
1) modified water glass is prepared; At room temperature, be 2.5-3.5 at modulus, density is 1.30-1.45g/cm 3waterglass in add the composite modifier accounting for waterglass total amount 8%, described composite modifier is made up of talcum powder, starch, POLYPROPYLENE GLYCOL, nano alumina powder, wherein with composite modifier total amount for benchmark talcum powder accounts for 35%, starch accounts for 12%, POLYPROPYLENE GLYCOL accounts for 18%, nano alumina powder accounts for 35%, makes modified water glass after stirring evenly;
2) molding sand is prepared: in casting normal sand, add the step 1 accounting for quartz sand 5%) modified water glass prepared, stirs after 40 minutes in puddle mixer.
Embodiment two
A preparation method for sodium silicate sand used for casting, the method comprises the steps:
1) modified water glass is prepared; At room temperature, be 2.5-3.5 at modulus, density is 1.30-1.45g/cm 3waterglass in add the composite modifier accounting for waterglass total amount 9%, described composite modifier is made up of talcum powder, starch, POLYPROPYLENE GLYCOL, nano alumina powder, wherein with composite modifier total amount for benchmark talcum powder accounts for 45%, starch accounts for 10%, POLYPROPYLENE GLYCOL accounts for 15%, nano alumina powder accounts for 30%, makes modified water glass after stirring evenly;
2) molding sand is prepared: in casting normal sand, add the step 1 accounting for quartz sand 5.8%) modified water glass prepared, stirs after 60 minutes in puddle mixer.
Embodiment three
A preparation method for sodium silicate sand used for casting, the method comprises the steps:
1) modified water glass is prepared; At room temperature, be 2.5-3.5 at modulus, density is 1.30-1.45g/cm 3waterglass in add the composite modifier accounting for waterglass total amount 8-10%, described composite modifier is made up of talcum powder, starch, POLYPROPYLENE GLYCOL, nano alumina powder, wherein with composite modifier total amount for benchmark talcum powder accounts for 50%, starch accounts for 8%, POLYPROPYLENE GLYCOL accounts for 16%, nano alumina powder accounts for 26%, makes modified water glass after stirring evenly;
2) molding sand is prepared: in casting normal sand, add the step 1 accounting for quartz sand 6%) modified water glass prepared, stirs after 80 minutes in puddle mixer.
Embodiment four
A preparation method for sodium silicate sand used for casting, the method comprises the steps:
1) modified water glass is prepared; At room temperature, be 2.5-3.5 at modulus, density is 1.30-1.45g/cm 3waterglass in add the composite modifier accounting for waterglass total amount 8-10%, described composite modifier is made up of talcum powder, starch, POLYPROPYLENE GLYCOL, nano alumina powder, wherein with composite modifier total amount for benchmark talcum powder accounts for 45%, starch accounts for 11%, POLYPROPYLENE GLYCOL accounts for 17%, nano alumina powder accounts for 27%, makes modified water glass after stirring evenly;
2) molding sand is prepared: in casting normal sand, add the step 1 accounting for quartz sand 6.5%) modified water glass prepared, stirs after 60 minutes in puddle mixer.
The key technical indexes of the molding sand of embodiment one to four
24 hours dry compression >=3.6MPa
100 DEG C of retained strength≤0.15MPa
Table 1 is the performance comparison of the light water glass sand of embodiment one to four performance and prior art:
The performance comparison of the light water glass sand of table 1 embodiment one to four performance and prior art
The present invention Prior art
Dry compression (MPa) ≥3.2 ≥2.3
Retained strength (MPa) ≤0.15 ≤1.5
Collapsibility Good Difference
Gas forming amount (ml/g) ≤8 ≤16
Sand removal mode Dry method shakes Water is quick-fried or water-soluble
Casting quality Flawless, gloss, pore is few Have crackle, dark and gloomy, pore is many
Applicant states, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, namely do not mean that the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to equivalence replacement and the interpolation of auxiliary element, the concrete way choice etc. of each raw material of product of the present invention, all drops within protection scope of the present invention and open scope.

Claims (1)

1. a preparation method for sodium silicate sand used for casting, is characterized in that, the method comprises the steps:
1) modified water glass is prepared; At room temperature, be 2.5-3.5 at modulus, density is 1.30-1.45g/cm 3waterglass in add the composite modifier accounting for waterglass total amount 8-10%, described composite modifier is made up of talcum powder, starch, POLYPROPYLENE GLYCOL, nano alumina powder, wherein with composite modifier total amount for benchmark talcum powder accounts for 35-45%, starch accounts for 6-11%, POLYPROPYLENE GLYCOL accounts for 14-17%, nano alumina powder accounts for 27-35%, and each component sum equals 100%, makes modified water glass after stirring evenly;
2) molding sand is prepared: in casting normal sand, add the step 1 accounting for quartz sand 5-6.5%) modified water glass prepared, stir 40-80 minute in puddle mixer after.
CN201110307628.2A 2011-10-11 2011-10-11 A kind of preparation method of sodium silicate sand used for casting CN102366812B (en)

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CN102962395B (en) * 2012-11-23 2014-11-26 西安工程大学 Compound modified water glass binder and preparation method thereof
CN104439040A (en) * 2014-12-01 2015-03-25 昌利锻造有限公司 Molding sand applied to copper alloy castings and preparation method of molding sand
CN104985105A (en) * 2015-06-26 2015-10-21 瓮安县瑞丰贸易有限公司 Novel water glass molding sand and preparation method thereof
CN105108035A (en) * 2015-08-11 2015-12-02 陈传松 Low-thermal-expansion high-strength modified composite sodium silicate-bonded sand for steel casting and preparation method of modified composite sodium silicate-bonded sand
CN105108042A (en) * 2015-08-11 2015-12-02 陈传松 High-thermal-conductivity easily-demolded modified composite water-glass sand for steel castings and preparation method thereof
CN105108041A (en) * 2015-08-11 2015-12-02 陈传松 High strength modified compound sodium silicate sand containing graphite fluoride for steel casting and preparation method thereof
CN105108034A (en) * 2015-08-11 2015-12-02 陈传松 Easy-to-collapse magnetic modified composite sodium silicate sand for steel casting and preparation method for easy-to-collapse magnetic modified composite sodium silicate
CN105108036A (en) * 2015-08-11 2015-12-02 陈传松 High-permeability light modified composite water glass sand for steel casting and preparation method of high-permeability light modified composite water glass sand
CN105108037A (en) * 2015-08-14 2015-12-02 郭伟 High-fluidity modified composite water glass sand for steel castings and preparation method thereof
CN105108038A (en) * 2015-08-14 2015-12-02 郭伟 High-collapsibility hydrotalcite modified composite sodium silicate-bonded sand for steel casting and preparation method of composite sodium silicate-bonded sand
CN105081201A (en) * 2015-08-14 2015-11-25 郭伟 High-lubricity modified composite sodium silicate-bonded sand for steel casting and preparation method of high-lubricity modified composite sodium silicate-bonded sand
CN105108040A (en) * 2015-08-14 2015-12-02 郭伟 Low-hot-shrinkage-rate modified compound sodium silicate sand for steel castings and preparation method thereof
CN105108039A (en) * 2015-08-14 2015-12-02 郭伟 High-temperature anti-sticking modified composite water glass sand for steel castings and preparation method thereof
CN106853505A (en) * 2017-01-09 2017-06-16 河南金耐源新材料科技有限公司 The casting method that ceramic sand inorganic binder and ceramic sand are recycled
CN107127291A (en) * 2017-04-01 2017-09-05 东风精密铸造安徽有限公司 A kind of water-glass sand core formula of moltening mold castings
CN107243592B (en) * 2017-05-16 2018-11-02 浙江遂金特种铸造有限公司 Inorganic nano particle modified waterglass and preparation method thereof

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