CN1069559C - Modified water glass for casting and its preparing process - Google Patents
Modified water glass for casting and its preparing process Download PDFInfo
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- CN1069559C CN1069559C CN99112955A CN99112955A CN1069559C CN 1069559 C CN1069559 C CN 1069559C CN 99112955 A CN99112955 A CN 99112955A CN 99112955 A CN99112955 A CN 99112955A CN 1069559 C CN1069559 C CN 1069559C
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Abstract
The present invention relates to a modified water glass for casting, which is characterized in that the modified water glass is modified by xylitol, and the modified water glass comprises the main chemical constituents: 0.5 to 25 wt% of xylitol, 25 to 55 wt% of sodium silicate, and water as the rest. The method for preparing the modified water glass for casting comprises the following steps: uniformly mixing, heating and stirring water glass, residual liquid or mother liquid of the xylitol, or other kinds of modifier which are weighed according to proportioning at 40 to 100 DEG C, adjusting the water content in order to lead the content of solid matter of the modified water glass to account for 30 to 60% and lead the content of water to account for 70 to 40%; cooling the mixture to be below 50 DEG C. The present invention has the advantages of high strength, good collapsibility and low cost, and the modified water glass used as a binder for casting can improve the quality of casting and is favorable to environment protection.
Description
The present invention relates to foundry engieering, a kind of moulding, binder for core-making---modified water glass is provided especially.
Along with development of modern industry, the mankind more and more pay attention to the consumption of the energy, material, the protection of environment.Foundry Production always is one of comparatively serious industry of environmental pollution, and wherein the binding agent of manufacturing mold core is one of pollution sources.The challenge that is faced with competition of the binder for casting of many, the harmful environmental protection of those cost height, energy consumption.Waterglass is introduced Foundry Production at early fifties, does type, core binding agent, substitutes clay dry type technology at that time, and puts it over very soon, and waterglass CO2 method was once becoming one of main technology of Foundry Production.Occurred various self-setting silicate process technologies later on again, its main curing agent has: cement, ferrosilicon powder, red mud, slag etc.But these technologies have a common shortcoming, i.e. waterglass addition height, and type, core collapsibility are poor, and casting quality is bad, and old sand is difficult for regeneration.Because glass addition height (can reach 7～9% sometimes) forever, the waterglass film of sand grain surface be (800～870 ℃) fusing at high temperature, forms continuous vitreum fused mass, after the cooling sand grains is sticked together securely, this is the root of water-glass sand shortcoming.For improving the collapsibility of water-glass sand, various countries founder author has done big quantity research, develop the waterglass of various modifications, modifier comprises dextrin, sugar, molasses, Sodium Polyacrylate, polyacrylamide, sodium phosphate trimer, cellulose (carboxymethyl cellulose, carboxy-propyl cellulose), humic acid, sodium humate, hydrogenated glucose etc.Should be noted that these modifier have improved the collapsibility of water-glass sand to some extent, but all do not eliminate the shortcoming of glass sand forever at all.From the sixties, foundry resin is widely applied, and that resin sand has is efficient, energy-conservation, improve advantages such as casting quality, the renewable reuse of old sand, thereby has replaced the dominant position of water-glass sand.The application of resin sand has significantly promoted the progress of foundry engieering, but has also exposed some new problems.As: producing some in the production has the gas of penetrating odor, formaldehyde, amine gas, SO
2, benzene class, hydrocarbon gas, contain the gas of cyanide, these gases not only are detrimental to health, and cause environmental pollution, the discharging of especially resinous antiquated sand, the harm ecological balance.Along with the attention of various countries, cause that more numerous founders author pays close attention to environmental protection.Add the resin price costliness, the castings production cost is improved, corporate profit margin descends.Reason in sum, many founder authors take up to sodium silicate binder again.Ester solidifies the research of glass sand forever, and the waterglass addition is descended significantly, for the collapsibility of improving water-glass sand has been created condition.The present invention of day nineteen eighty-three waterglass VRH method hardening process, the nontoxic making core with aeration ossification method of waterglass had been invented by China in 1997, a lot of in recent years people have carried out the research that makes the sclerosis of waterglass core with heating using microwave, have further promoted the improvement of sodium silicate binder.New page is opened in the large-scale popularization application that is waterglass after 2000.
The object of the present invention is to provide a kind of modified water glass for casting, it has the intensity height, and collapsibility is good, and is with low cost, is used as the quality that binder for casting can improve foundry goods, helps environmental protection.
The invention provides a kind of casting with modification glass forever, be characterised in that altogether: this modified water glass is by the xylitol modification, and the main chemical mass percent is (except that specifying, being mass percent)
Xylitol 0.5～25
Sodium metasilicate 25～55
Water surplus
The structural formula of xylitol described in the present invention is
OH, the best addition of xylitol is 3%～10%.
One or more that can also add dextrin, sugar, molasses, Sodium Polyacrylate, polyacrylamide, sodium phosphate trimer, cellulose, humic acid, sodium humate, hydrogenated glucose among the present invention carry out modification, and the amount of adding is 0.1～10%.
The present invention also provides the preparation method of above-mentioned modified water glass, it is characterized in that: will stir by waterglass, xylitol or other modifier Hybrid Heating of proportioning weighing, 40～100 ℃ of temperature, regulating moisture makes the modified water glass solid matter content account for 20～60%, water accounts for 70～40%, be cooled to get product below 50 ℃.
The used modulus of water glass of the present invention is 1.6～4.0, and solid matter content is 30～55%.Modulus of water glass is preferably 2.0～3.0.
The used xylitol of the present invention can be Xylitol refining, Xylitol mother liquor, xylitol raffinate, and Xylitol mother liquor, xylitol raffinate are the xylitol aqueous solution that contains xylitol 30～80%.Modified water glass of the present invention can be used as casting moulding, coremaking binding agent.
The used xylitol of the present invention derives from corncob, cornstalk, rice husk, cereal shell class agricultural by-products.Such material is made wood sugar through hydrolysis, and the wood sugar hydrogenation is made Xylitol mother liquor, and the wood sugar yeast juice can be produced making xylitol, and produces byproduct xylitol raffinate.Xylitol mother liquor and raffinate source are abundant, and price is low, especially the xylitol raffinate, because behind the purifying xylose alcohol, its impurity content increases, but xylitol content is still more than 60%, its application waits for exploitation, and produces modified water glass with it, and its impurities does not influence the modified water glass performance.
Manufacture core with modified water glass provided by the invention, can adopt various casting roughing sand such as washing natural silica Sand, scouring natural silica Sand, selected natural silica Sand, selected silica sand, Reshaping Silica Sand, zircon sand, forsterite sand, chromite sand, sillimanite sand, aquamarine stone sand, magnesia.The sand mix material proportioning is: foundry sand is 99～92%, and modified water glass 1～8%, hardening process can adopt and blow CO
2Hardening process, VBH hardening process, organic ester hardening method, microwave heating method, baking hardening method etc.To adopt washing silica sand ester to be hardened to example, the sand compound than suitable proportion is: washing silica sand 96～98%, modified water glass 2～4%, organic pure 0.2～0.4%.Because modified water glass intensity height of the present invention, addition is low, core is easily defeated and dispersed, the easy regeneration of old sand,, can deservedly be referred to as green binding agent with other organic binder bond environmental pollution minimum relatively.
The present invention has following advantage:
1. modified water glass addition of the present invention low (≤3%), the intensity height, collapsibility is good, can adopt and blow CO
2The sclerosis of the whole bag of tricks such as method, VRH method, ester hardening process.
2. xylitol modified water glass raw material source is wide, and low price can significantly reduce the castings production cost.
3. type, core gas forming amount are low, do not contain N, S, P harmful element, can significantly reduce gas hole defect, can avoid magnesium iron spare surface abnormal nodularizing.
4. can be used for the production of various casting alloys: cast iron, cast steel, cast copper, cast aluminium.
5. core has thermoplasticity when cast, can reduce the casting thermal fragmentation defective, thereby reduces loss due to spoiled work, reduces the soldering rate.
6. cast back core collapsibility is good, is easy to desanding, does not need quick-fried water sand removal, thereby has stopped to cause because of water is quick-fried the crackle of foundry goods.
7. old sand is easy to regeneration.
8. casting quality is good, and quality significantly improves when especially producing steel-casting, can match in excellence or beauty with resin sand technology.
9. strong to roughing sand adaptability, can be used for washing silica sand, clean silica sand, concentration sand, artificial sand, shaping sand, zircon sand, chromite sand, forsterite sand.
10. smell is low in the production process, does not discharge SO
2, formaldehyde, amine, benzene, hydrocarbon gas, improved labour health condition, the favorable environment protection.
Below by embodiment in detail the present invention is described in detail.
Embodiment 1
With modulus is 2.20, the waterglass 1000kg of Baume degrees 50 adds in the 1500L reactor, add the xylitol raffinate 50kg (containing the solid xylitol amount is 30kg) that contains xylitol 60% again, stir, heating 40～100 ℃ dissolves each other material fully, adjusting solids content is 50～55%, is cooled to below 50 ℃, gets modified water glass A
1
Use above-mentioned technology, only change xylitol raffinate addition and get modified water glass A
2, A
3, A
0, concrete proportioning sees Table 1.
Table 1
| Classification | Waterglass | Xylitol (kg) (in amount of solid) | ||
| Modulus | Baume degrees | Addition (kg) | ||
| A 1 | 2.20 | 50 | 1000 | 30 |
| A 2 | 2.20 | 50 | 1000 | 60 |
| A 3 | 2.20 | 50 | 1000 | 90 |
| A 0 | 2.20 | 50 | 1000 | |
Embodiment 2
To imitate is 2.63, the waterglass 1000kg of Baume degrees 45 adds in the 1500L reactor, the Xylitol mother liquor 45.2kg (solid xylitol content is 30kg) that adds xylitol content 65%, 40～100 ℃ of agitating heating, material is dissolved each other fully, adjust solids content and be 45～48% modified water glass B
1
Only change the Xylitol mother liquor addition with above-mentioned technology and get modified water glass B
2, B
3, B
0, concrete proportioning sees Table 2.
Table 2
| Classification | Waterglass | Xylitol (kg) (with solid content meter) | ||
| Modulus | Baume degrees | Addition (kg) | ||
| B 1 | 2.63 | 45 | 1000 | 30 |
| B 2 | 2.63 | 45 | 1000 | 60 |
| B 3 | 2.63 | 45 | 1000 | 90 |
| B 0 | 2.63 | 45 | 1000 | |
Embodiment 3
With modulus 3.13, the waterglass 1000kg of Baume degrees 39 adds in the 1500 L reactors, adds Xylitol refining 30kg, and 40～100 ℃ of agitating heating are dissolved each other material fully, and adjusting solids content is 41～45%, gets modified water glass C
1
Only change the Xylitol refining addition with above-mentioned technology, get modified water glass C
2, C
3, C
0, concrete proportioning sees Table 3.
Table 3
| Classification | Waterglass | Xylitol (kg) | ||
| Modulus | Baume degrees | Addition (kg) | ||
| C 1 | 3.13 | 39 | 1000 | 30 |
| C 2 | 3.13 | 39 | 1000 | 60 |
| C 3 | 3.13 | 39 | 1000 | 90 |
| C 0 | 3.13 | 39 | 1000 | |
Embodiment 4
With modulus is 2.63, and the waterglass 1000kg of Baume degrees 45 adds in the 1500L reactor, adds the xylitol raffinate 120kg that contains xylitol 60%, 40～100 ℃ of agitating heating add sodium phosphate trimer 15kg, after special material dissolves each other fully, adjusting solids content is 46～48%, gets modified water glass D.
Embodiment 5
1000g is detected binding agent add SHY type blade mixer, add glyceryl triacetate 3.5g and mix 1.5min, add waterglass A of the present invention with normal sand
125g mixes 1.5min and shakes out, and (the sample throat area is 5 to make standard " 8 " type sample with standard method
1/2* 5
1/2(cm
2)), sample is placed different time SWY type hydraulic universal strength-testing machine, test sample tensile strength, and molding sand proportion and intensity see Table 4, repeat above-mentioned technology with different waterglass, and list the result in table 4.
13 ℃ of RH 65% of table 4 temperature
| Waterglass | Tensile strength MPa | |||||
| Classification | Modulus | Addition g | 1h | 2h | 4h | 24h |
| A 0 | 2.20 | 25 | 0.04 | 0.07 | 0.11 | 0.5 |
| A 1 | 2.20 | 25 | 0.05 | 0.11 | 0.40 | 0.75 |
| A 2 | 2.20 | 25 | 0.07 | 0.18 | 0.48 | 0.80 |
| A 3 | 2.20 | 25 | 0.09 | 0.2 | 0.5 | 0.80 |
| B 0 | 2.63 | 25 | 0.17 | 0.23 | 0.28 | 0.3 |
| B 1 | 2.63 | 25 | 0.19 | 0.3 | 0.28 | 0.45 |
| B 2 | 2.63 | 25 | 0.2 | 0.35 | 0.38 | 0.5 |
| B 3 | 2.63 | 25 | 0.23 | 0.32 | 0.49 | 0.48 |
| C 0 | 3.13 | 25 | 0.1 | 0.15 | 0.2 | 0.23 |
| C 1 | 3.13 | 25 | 0.16 | 0.23 | 0.27 | 0.34 |
| C 2 | 3.13 | 25 | 0.19 | 0.27 | 0.31 | 0.35 |
| C 3 | 3.13 | 25 | 0.18 | 0.20 | 0.24 | 0.26 |
Embodiment 6
The 1000g normal sand is added SHY type puddle mixer, add the mixed 2min of waterglass 35g of the present invention and shake out, make φ 50 * 50 standard sand samples, blow CO
2Flow 0.6m
3/ h, air blowing 15s measures real-time intensity and the intensity of depositing different time with SWY type hydraulic universal strength-testing machine, is A respectively
0, A
1, B
0, B
1Four kinds of sodium silicate process performances, and list relevant parameter in table 5.
15 ℃ of RH 68% of table 5 temperature
| Classification | Modulus | Addition g | Instant resistance to compression MPa | 24h resistance to compression MPa |
| B 0 | 2.63 | 35 | 0.86 | 1.3 |
| B 1 | 2.63 | 35 | 1.05 | 1.8 |
| A 0 | 2.20 | 35 | 0.90 | 1.5 |
| A 1 | 2.20 | 35 | 1.20 | 2.1 |
Embodiment 7
The 1000g normal sand is added SHY type puddle mixer, add the mixed 2min of waterglass 25g and shake out, make φ 50 * 50 standard specimens, put into vacuum chamber and be evacuated down to 2.6 * 1O
3Pa cuts off vavuum pump, is blown into CO
2Room pressure to 26 * 10
3～27 * 10
3Pa, pressurize 30s removes vacuum, takes out sample and surveys compression strength, uses A
0, A
1, A
2, B
0, B
1, B
2Waterglass is made sample gained intensity respectively and is seen Table 6.
Table 6
| Classification | Modulus | Addition g | Instant resistance to compression MPa | 24h resistance to compression MPa |
| A 0 | 2.2 | 25 | 0.2 | 2.5 |
| A 1 | 2.2 | 25 | 0.24 | 2.8 |
| A 2 | 2.2 | 25 | 0.3 | 3.0 |
| B 0 | 2.63 | 25 | 0.6 | 1.90 |
| B 1 | 2.63 | 25 | 0.84 | 2.20 |
| B 2 | 2.63 | 25 | 1.03 | 2.38 |
Embodiment 8
Different roughing sand 1000g are added puddle mixer respectively, add the mixed 1.5min of glyceryl triacetate again and add waterglass C again
2Mix 2min, shake out, make standard " 8 " shape sample, survey 0.5h, 1h and 24h tensile strength and list table 7 in.
Table 7 tensile strength MPa
| The roughing sand classification | Waterglass C 2Addition (g) | Ester addition (g) | 0.5h | 1h | 24h |
| Haicheng City washed-out sand | 30 | 4 | 0.18 | 0.31 | 0.67 |
| The Da Lin concentration sand | 25 | 3 | 0.2 | 0.35 | 0.81 |
| The Da Lin washed-out sand | 30 | 4 | 0.26 | 0.41 | 1.12 |
| Forsterite sand | 25 | 3 | 0.03 | 0.07 | 0.6 |
Embodiment 9
The 1000g concentration sand is added puddle mixer, add 4g triacetic acid glyceryl alcohol and mix 1.5min, add waterglass 30g respectively and mix 1.5min, shake out and make standard φ 30 * 50 type samples, room temperature vulcanizing 24h puts into sample and is warming up to set point of temperature insulation 20min, takes out and is cooled to room temperature, survey residual compression strength, be modified water glass A respectively
0, A
2, B
0, B
2, C
0, C
2, D residual compression strength, the gained data are listed table 8 in.
Table 8
| Waterglass | Residual compression strength MPa | ||||
| Classification | Modulus | Addition g | 600℃ | 800℃ | 1000℃ |
| A 0 | 2.2 | 30 | 0.45 | 0.6 | 0.8 |
| A 2 | 2.2 | 30 | 0.11 | 0.24 | 0.34 |
| B 0 | 2.63 | 30 | 0.2 | 0.35 | 0.6 |
| B 2 | 2.63 | 30 | 0.21 | 0.22 | 0.2 |
| C 0 | 3.13 | 30 | 0.1 | 0.18 | 0.22 |
| C 2 | 3.13 | 30 | 0.06 | 0.08 | 0.1 |
| D | 2.63 | 30 | 0.19 | 0.21 | 0.2 |
Claims (7)
1. modified water glass for casting, it is characterized in that: this modified water glass is by the xylitol modification, and the main chemical mass percent is
Xylitol 0.5～25
Sodium metasilicate 25～55
Water surplus
2. according to the described modified water glass for casting of claim 1, it is characterized in that: the addition of xylitol is 3～10% (in mass content) in the modified water glass.
3. according to claim 1,2 described modified water glass for casting, it is characterized in that: one or more that add dextrin, sugar, molasses, Sodium Polyacrylate, polyacrylamide, sodium phosphate trimer, cellulose, humic acid, sodium humate, hydrogenated glucose carry out modification, and the amount of adding is 0.1～10%.
4. preparation method according to the described modified water glass for casting of claim 1, it is characterized in that: will stir by waterglass, xylitol raffinate or mother liquor or other modifier Hybrid Heating of proportioning weighing, 40～100 ℃ of temperature, regulating moisture makes the modified water glass solid matter content account for 30～60%, water accounts for 70～40%, be cooled to get product below 50 ℃.
5. according to the preparation method of the described modified water glass for casting of claim 4, it is characterized in that: used modulus of water glass is 1.6～4.0, and solid matter content is 30～55%.
8. according to the preparation method of the described modified water glass for casting of claim 5, it is characterized in that: modulus of water glass is 2.0～3.0.
7. claim 1,2 or 3 described modified water glass for casting are as casting moulding, coremaking binding agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99112955A CN1069559C (en) | 1999-05-26 | 1999-05-26 | Modified water glass for casting and its preparing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99112955A CN1069559C (en) | 1999-05-26 | 1999-05-26 | Modified water glass for casting and its preparing process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1238249A CN1238249A (en) | 1999-12-15 |
| CN1069559C true CN1069559C (en) | 2001-08-15 |
Family
ID=5276196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99112955A Expired - Fee Related CN1069559C (en) | 1999-05-26 | 1999-05-26 | Modified water glass for casting and its preparing process |
Country Status (1)
| Country | Link |
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| CN (1) | CN1069559C (en) |
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| CN109439203B (en) * | 2018-10-15 | 2021-04-20 | 湖南镭目科技有限公司 | Adhesive and preparation method thereof |
| CN109320130B (en) * | 2018-10-29 | 2020-11-10 | 郑州远东耐火材料有限公司 | Modified water glass adhesive for sand mold of electric melting brick and preparation method thereof |
| CN110064727A (en) * | 2019-06-10 | 2019-07-30 | 沈阳汇亚通铸造材料有限责任公司 | A kind of ester solidification sodium silicate sand used for casting composition |
| CN110732630A (en) * | 2019-11-25 | 2020-01-31 | 武汉绿之美铸造材料有限公司 | inorganic composite adhesive for casting exothermic riser |
| CN115106479B (en) * | 2022-06-27 | 2024-10-01 | 北京仁创砂业铸造材料有限公司 | Regeneration method of sodium silicate casting waste sand and regenerated sand obtained by same |
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| CN1238249A (en) | 1999-12-15 |
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