CN1031495A - Additive for sodium silicate sand - Google Patents
Additive for sodium silicate sand Download PDFInfo
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- CN1031495A CN1031495A CN 88101814 CN88101814A CN1031495A CN 1031495 A CN1031495 A CN 1031495A CN 88101814 CN88101814 CN 88101814 CN 88101814 A CN88101814 A CN 88101814A CN 1031495 A CN1031495 A CN 1031495A
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Abstract
The present invention relates to a kind of additive for sodium silicate sand with excellent properties.
Solve water-glass sand high-temperature softening deformation and knockability problem, key is how to break away from Na
2The adverse effect of O.The present invention uses chemical composition to be CaO: P
2O
5=1: the material of (1.12～1.40) is an additive at 400～1000 ℃ of roasting temperature products, adds in the water-glass sand, no matter chemistry is from hard or physical solidification, at temperature rise period and Na
2O forms the high stable powdery phase of fusing point.Do not occur the melten glass attitude material that sodium metasilicate remelting or mineralising reaction generate after the cast of type (core) sand, thereby solved water-glass sand high-temperature softening deformation and knockability problem.
Description
The present invention relates to a kind of additive for sodium silicate sand with excellent properties.
Waterglass is as foundry sand type (core) binding agent, have quick solidifying, intensity height, get angry low, pollute less, low cost and other advantages, but Na in its component
2The sand mold that O causes (core) high-temperature softening deformation and knockability problem always obtain satisfied the solution, influence its further expansion and use.Attach great importance to the research of modifying water glass and additive both at home and abroad, from document as can be known, prior art and achievement in research have the following aspects:
(1), development is various improves the additives that knockability is used, and comprises components such as organic matter, carbonaceous material, oxide, carbonate, phosphate, clay class mineral.Its design is: utilize organic matter or carbonaceous material to form volatile matter and carbon film when high temperature is poured into a mould, destroy waterglass bonded bridge continuity, reduce retained strength, thereby improve knockability; Utilize in the inorganic matter high-valence cationic SiO when high temperature and in the waterglass
2Form partly high-melting-point decentralized photo, improve the binding agent remelting temperature, make type (core) sand retained strength second peak value from 800 ℃ to 900～1100 ℃ of transfers, thereby improve knockability.Adopt these additives, under the routine test condition of the quick-fried heat of sample back room temperature cooling, can obtain lower retained strength test data.During the production practical application, under 1300～1600 ℃ of influences of ferrous metal pouring temperature, sand mold (core) is by long-time heating and slowly cooling, Na in the waterglass
2O and the reaction of sand grains generation mineralising generate the molten glass phase, and actual retained strength is far above the routine test data.Therefore, waterglass sand mold (core), especially in, large-scale steel-casting sand mold (core), the knockability problem never obtains satisfied the solution.In addition, because Na
2The existence of O, problems such as the distortion that sand mold (core) hot mastication causes, the type that expands are difficult to solve equally.
(2), develop various modified water glass, when introducing organic defeated and dispersed thing and inorganic defeated and dispersed thing, improve adhesion strength, reduce the waterglass actual amount, with minimizing Na
2The adverse effect of O.But as low-cost, high-strength adhesive, the economic actual effect that modification obtains is limited, Na certainly for waterglass
2The adverse effect of O can't be eradicated.
(3), the various moduluses of development are waterglass up to 3.4～4.5 sodium, and more potassium system, lithium system, the alkali metal quaternary amine type waterglass of high mode reducing basic anhydride content, thereby reduce its adverse effect.But, be difficult in the production apply owing to reasons such as manufacturing cost height and operation technique complexity.
As from the foregoing, prior art takes to destroy adhesive film continuous phase, improves the binding agent remelting temperature, improves modulus, reduces measures such as addition, has reduced Na to a certain extent
2O is to the adverse effect of water-glass sand knockability, but can't break away from Na
2Mineralising reaction between O and the sand grains, thereby actual effect is limited.
Purpose of the present invention is fundamentally to eliminate Na
2O is to the adverse effect of water-glass sand elevated temperature strength and knockability.
Design of the present invention is a chemically stable when seeking a kind of normal temperature and between the waterglass, Na during intensification and in the waterglass
2The material that O formation high-melting-point is stablized the powdery phase makes the residual Na of sand grain surface as additive for sodium silicate sand
2The O amount reduces to the degree that binding agent remelting and mineralising reaction do not take place in the sand mold (core) that is under the pouring temperature influence.
The present invention is verified, and the additive for sodium silicate sand that achieves the above object is characterized in that using chemical composition to be CaO P
2O
5=1: the material of (1.12～1.40) is a component at 400～1000 ℃ of roasting temperature products.
When using this product of roasting as additive, normal temperature has good chemical stability, the Na in temperature rise period and the waterglass down and between the waterglass
2O forms fusing point up to the stable powdery phase more than 1500 ℃, and in this temperature range, water-glass sand has thoroughly been broken away from binding agent remelting and mineralising reacting phenomenon, melten glass attitude material do not occur.Engineer testing shows that the elevated temperature strength of sample is extended to more than 1000 ℃; After 600～1500 ℃ of quick-fried heat and stove were cold, the residual compression strength of sample stably was lower than 4Kg/cm
2
Following example further illustrates the excellent properties of this additive.
Accompanying drawing (1) is CO
2Method water-glass sand high temperature compression strength (Kg/cm
2) curve, wherein curve 1 is the light water glass sand; Curve 2 is additive water-glass sand of the present invention, and data see Table (1).
Accompanying drawing (2) is CO
2Residual compression strength (the Kg/cm of method water-glass sand
2) curve, wherein curve 1 is the light water glass sand; Curve 2 is the SOLOSiL-433 modified sodium silicate sand; Curve 3 is defeated and dispersed dose of water-glass sand of LK-2; Curve 4 is additive water-glass sand of the present invention, and data see Table (2).
Accompanying drawing (3) is the residual compression strength (Kg/cm of physical solidification water-glass sand
2) curve, wherein curve 1 is the light water glass sand; Curve 2 is additive water-glass sand of the present invention, and data see Table (3).
Example one:
With Na
2CO
3With the above-mentioned product of roasting that the present invention uses, with 1: (2.5～3.5) ratio is mixed, and pulverizing is the following fine powders of 200 orders, in the porcelain crucible of packing into, in 1500～1520 ℃ of temperature roastings 20 minutes, with stove cooling or room temperature cooling.The glazing of porcelain crucible edge, sample still are powdery, no sintering or fusion sign.
Example two:
With modulus is the above-mentioned product of roasting that a series of waterglass of 2.2～4.5 and the present invention use, respectively with 1: (0.10～0.65) ratio blendes together the thickness suspension, pack in the porcelain crucible,, cool off with stove cooling or room temperature in 1500～1520 ℃ of temperature roastings 20 minutes.It is cellular that the glazing of porcelain crucible edge, sample are the milky of expansion upheaval, and finger is heavily by breaking, and is quite similar with the form after the quick-fried heat of Ludox high temperature.The light water glass specimen of contrast is smooth light green fused glass block in crucible, very hard.
Example one explanation, the above-mentioned product of roasting that the present invention uses is during intensification and a certain proportion of Na
2O generates a kind of cenotype, and its fusing point is higher than 1500 ℃.Example two explanation, this product of roasting, Na during intensification and in the waterglass
2The O response situation is with itself and monomer Na
2The O response situation is consistent, and the similitude of sample high temperature form and Ludox has confirmed this point.The explanation of two examples is with this product of roasting during as additive for sodium silicate sand, when the cast intensification and Na
2O forms high-melting-point and stablizes the powdery phase, and the reaction of binding agent remelting and mineralising will can not appear in water-glass sand, and high-temperature softening deformation and knockability problem will achieve a solution simultaneously.
Example three:
The above-mentioned product of roasting that the present invention is used, with di-iron trioxide, carbonaceous material with 1: (0～0.10): (0～0.10) ratio is combined into a kind of powder additive, tests its influence to the water-glass sand elevated temperature strength.Experimental condition is: quartz sand 100%, modulus are 2.7 waterglass 5%, powder additive 2%, and mixed grind is 6～8 minutes in simpson mill is used in experiment, prepares φ 11 * 20 samples and blows CO with the manual sampling instrument of GF
2Gas hardening, with 200～1000 ℃ of elevated temperature strengths of GF high-temperature behavior test instrument test, control sample is identical waterglass but not additivated water-glass sand, result of the test sees Table (1) and figure (1).
Table (1) CO
2Method water-glass sand high temperature compression strength (Kg/cm
2)
| Sample and prescription | Quick-fried hot temperature (℃) | ||||||
| Waterglass (%) | Additive (%) | 200 | 400 | 600 | 800 | 1000 | |
| (1) light water glass sand | 5 | ／ | 50 | 68 | 20 | ／ | ／ |
| Additive of the present invention (2) water-glass sand | 5 | 2 | 58 | 78 | 68 | 50 | 24 |
This product of roasting is used in example three explanation singlely, and perhaps when improving combination property and comprise a certain amount of other component, the elevated temperature strength of water-glass sand can be extended to more than 1000 ℃.In this temperature range, the ruckbildung that the binding agent remelting causes in the light water glass sand does not appear, help solving expand type and problem on deformation, improve the foundry goods precision.
Example four:
The additive that example three is used is tested it to CO
2The influence of method water-glass sand retained strength.Experimental condition is: prescription and sand mulling craft such as example three, φ 50 * 50 standard specimen 2Kg/cm
2The CO of pressure and 10L/min flow
2Gas blows sclerosis in 20 seconds, behind the test real-time intensity, advances stove under assigned temperature, calculates quick-fried hot 20 minutes with the stable back of furnace temperature, with stove cooling 24 hours, measures residual compression strength under the room temperature.Control sample is: the SOLOSiL433 modified sodium silicate sand of FOSeCO; The defeated and dispersed dose of water-glass sand of LK-2 in exquisite potter's clay ore deposit, Linan, Zhejiang; Do not add defeated and dispersed dose light water glass sand.Result of the test sees Table (2) and figure (2).
Example four explanation, use additive of the present invention after, certain proportion Na in the water-glass sand
2O forms high-melting-point and stablizes the powdery phase, the residual Na of sand grain surface when heating up
2The O amount has been reduced to and has been in the degree that binding agent remelting and mineralising reaction do not take place in 1500 ℃ of following temperature ranges, thereby in 600～1500 ℃ of test temperature scopes, has stably kept the effect of low-residual intensity.Adopted the highest quick-fried hot temperature to reach 1500 ℃ and in the test with the slow condition of cooling of stove, in having simulated, large-scale steel-casting production actual conditions, under this experimental condition, the mineralising reaction of hot stage is carried out relatively fully, light water glass sand and the water-glass sand that adds general defeated and dispersed dose, cold in 1300 ℃ of quick-fried heat of temperature and stove, retained strength the 3rd peak value that typical mineralising reaction causes all appears, and electron microscopic observation is to sand grain surface glazing and border partial melting form.Have the water-glass sand that uses additive of the present invention only, both second peak values during the binder free remelting, the 3rd peak value when not having the mineralising reaction again, electron microscopic observation is clear and do not have a melten glass attitude material to sand grain surface and boundary profile.The water-glass sand that possesses this excellent properties is in can solving, large-scale steel-casting sand mold (core) knockability problem.
Example five:
The additive that example three is used is tested its influence to physical solidification water-glass sand retained strength.Experimental condition is: roughing sand NBS55/100 Da Lin normal sand, weld point is 1300～1350 ℃, all the other prescriptions and sand mulling craft such as example three, φ 50 * 50 standard specimens of making, cured 1 hour in 200 ℃ of temperature after the hygrometric state demoulding, the quick-fried heat of sample and the type of cooling such as example four, control sample is for adding an amount of clay to obtain the light water glass sand of necessary wet strength.Result of the test sees Table (3) and figure (3).
Example five explanation, not only chemical automatic harding glass sand, and physical solidification water-glass sand, uses additive of the present invention after, need only quick-fried hot temperature and be no more than the sand fritting point, have the Na of breaking away from equally
2O adverse effect and obtain stably to keep the effect of low-residual intensity.In addition, the additive of the present invention of fine-powdered also provides certain wet strength and plasticity, helps the system type (core) and the demoulding under the situation that adds or do not add clay less, reduces clay to reducing the adverse effect of solidification intensity.
Example six:
The additive that example three is used, test its under normal temperature condition with the mutually mixed chemical stability of waterglass.Experimental condition is: the waterglass of modulus 2.7: additive=5: 2, it is stirred evenly the back strongly forms the thickness suspension, airtight deposit three months after, press the method test of example four, result of the test is compared with example four, effect is identical.
Example six explanations under normal temperature condition, have good chemical stability between additive of the present invention and the waterglass.This specific character not only helps additive and waterglass are blended together the use of thickness suspension, and has guaranteed that the water-glass sand up time is not had any adverse effect.
Comprise that the test of above whole example and other series of process shows, the product of roasting that the present invention uses can be used as the single component of additive; Also can mix use with some organic matters, carbonaceous material, oxide and clay class mineral, to improve some combination property, when this product of roasting content in the additive reaches more than 20% and guarantees certain addition, namely have obvious reduction retained strength second peak value and the 3rd peak effect.
More than whole examples, shown and the excellent properties of the diverse additive of the present invention of prior art, can fundamentally eliminate Na in the water-glass sand2The adverse effect of O. In addition, this additive also has normal temperature chemical stability, low gas-forming property and the good process performance such as certain wet strength is provided. Use this additive, on the one hand, increase substantially Sodium Silicate Bonded Sand at High Temperature intensity, make the sodium silicate binder performance Ludox characteristic under the condition of high temperature, can effectively solve swollen type and problem on deformation, improve casting accuracy; On the other hand, obtain splendid knockability, can the quick-fried temperature of decrease foundry goods water maybe needn't adopt water explosition blast cleaning, that avoids so cause bursts and the defectives such as micro-crack, distortion. In addition, within the specific limits, this water-glass sand will replace expensive resin sand and clay dry type (core) sand of poor efficiency.
Claims (3)
1, a kind of Foundry Production that is used for can be when heating up and Na
2O forms high-melting-point and stablizes the powdery phase, thereby improves the additive of waterglass sand mold (core) elevated temperature strength and knockability, it is characterized in that this additive uses chemical composition to be CaO: P
2O
5=1: the material of (1.12～1.40) is a component at 400～1000 ℃ of roasting temperature products.
2,, it is characterized by and can 100% form by above-mentioned product of roasting according to the described additive of claim 1; Also can comprise other components such as organic matter, carbonaceous material, oxide, clay class mineral keeping above-mentioned product of roasting to reach on the basis more than 20%.
3, according to claim 1,2 described additives, the thickness suspension that it is characterized by powdery, suspension or blend together with waterglass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88101814 CN1031495A (en) | 1988-03-26 | 1988-03-26 | Additive for sodium silicate sand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88101814 CN1031495A (en) | 1988-03-26 | 1988-03-26 | Additive for sodium silicate sand |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1031495A true CN1031495A (en) | 1989-03-08 |
Family
ID=4831889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88101814 Pending CN1031495A (en) | 1988-03-26 | 1988-03-26 | Additive for sodium silicate sand |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1031495A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1069559C (en) * | 1999-05-26 | 2001-08-15 | 沈阳市铸造材料研究所 | Modified water glass for casting and its preparing process |
| CN105170876A (en) * | 2015-09-09 | 2015-12-23 | 重庆大学 | Water-glass sand and preparation and use methods thereof |
| CN107695286A (en) * | 2017-10-12 | 2018-02-16 | 东风精密铸造安徽有限公司 | A kind of founding materials highly effective binder |
| CN110944768A (en) * | 2017-08-03 | 2020-03-31 | 旭有机材株式会社 | Casting mold material and method for producing same, method for producing casting mold, and method for recycling recycled refractory aggregate |
| CN111408683A (en) * | 2020-04-10 | 2020-07-14 | 河南金耐源新材料科技有限公司 | Preparation method of modified self-hardening sand |
| CN114472796A (en) * | 2022-01-21 | 2022-05-13 | 中国第一汽车股份有限公司 | Modified inorganic binder sand with collapsibility and preparation method thereof |
-
1988
- 1988-03-26 CN CN 88101814 patent/CN1031495A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1069559C (en) * | 1999-05-26 | 2001-08-15 | 沈阳市铸造材料研究所 | Modified water glass for casting and its preparing process |
| CN105170876A (en) * | 2015-09-09 | 2015-12-23 | 重庆大学 | Water-glass sand and preparation and use methods thereof |
| CN110944768A (en) * | 2017-08-03 | 2020-03-31 | 旭有机材株式会社 | Casting mold material and method for producing same, method for producing casting mold, and method for recycling recycled refractory aggregate |
| CN107695286A (en) * | 2017-10-12 | 2018-02-16 | 东风精密铸造安徽有限公司 | A kind of founding materials highly effective binder |
| CN111408683A (en) * | 2020-04-10 | 2020-07-14 | 河南金耐源新材料科技有限公司 | Preparation method of modified self-hardening sand |
| CN111408683B (en) * | 2020-04-10 | 2021-11-26 | 河南金耐源新材料科技有限公司 | Preparation method of modified self-hardening sand |
| CN114472796A (en) * | 2022-01-21 | 2022-05-13 | 中国第一汽车股份有限公司 | Modified inorganic binder sand with collapsibility and preparation method thereof |
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