CN1108978A - Lignin dispersing agent and its application - Google Patents
Lignin dispersing agent and its application Download PDFInfo
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- CN1108978A CN1108978A CN 94110887 CN94110887A CN1108978A CN 1108978 A CN1108978 A CN 1108978A CN 94110887 CN94110887 CN 94110887 CN 94110887 A CN94110887 A CN 94110887A CN 1108978 A CN1108978 A CN 1108978A
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- lignin
- sand
- waterglass
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Abstract
The ligrin disperser belonging to special additive for casting mould is prepared with dry lignin powder as solute, which is obtained from black liquid of alkaline paper pulp, and aqueous solution of NaOH as solvent. The lignin-water glass sand made up of the said lignine disperser, water glass and other components of water glass-sand may be used as the material for casting mould. Its advantages include reducing the residual strength of moulding sand, increasing dispersity and cleaming efficiency, and improving quality of castings.
Description
What the present invention relates to is the mechanical industry field, specifically is the specialist additive and the application thereof of the mold material in the Foundry Production.
Water-glass sand is cast moulding (core) sand of making binding agent with waterglass.Because waterglass has certain adhesion strength, and is with low cost, nontoxic odorless, the preparation molding sand process is simple, easy operating, Dust Capacity is low, and four during the last ten years, and water glass type (core) sand is used very wide in Foundry Production.But water-glass sand retained strength behind casting pouring is too high, causes cast cleaning very difficult, the broader applications that hindered water-glass sand.Over past ten years, some are great, complicated, thin-walled, the foundry goods that is difficult to sand removal have trended towards using resin sand production, but resinoid bond costs an arm and a leg, resin: 1～1.3 ten thousand yuan/ton, 500～700 yuan/ton of waterglass), the cast back produces large amount of organic gas, serious to air pollution, so use the casting producer of resin sand all to want the huge air cleaning facility of a while and a cover to match in industrialized countries such as Europe, the United States, days, expense is extremely expensive, and the most of foundry enterprises of China are difficult to this bear.This forces the expansion application problem of paying attention to research water-glass sand both at home and abroad again, and one of major technique measure is exactly to develop all kinds of organic and inorganic high-effect defeated and dispersed dose, increases substantially the collapsibility of water-glass sand.Recognize from result domestic, the international literature retrieval, organic defeated and dispersed dose main material is respectively the acidic paper pulp waste handled through modification and through the starch of hydrolysis, hydrogenation, with these two kinds organic defeated and dispersed dose of inorganic defeated and dispersed doses of matching is respectively vermiculite (or lime stone) and AmG(or AmGFo) powder, and retrieving about lignin as certain industrial promoter, is respectively with a kind of component of lignin as surfactant and water-setting binding agent.In document 3150ERWENO world patent latest list, 007057931 promoter, 008298256WPJ promoter.
The purpose of this invention is to provide a kind of lignin dispersing agent, the byproduct lignin that is about to the paper industry environmental improvement becomes widely used defeated and dispersed agent material in the foundary industry, thereby turn waste into wealth, simultaneously, reduce the retained strength of casting water glass type (core) sand, improve collapsibility, finally reach and improve cast cleaning efficient and casting quality, improve old sand reclamation rate and economic benefit, alleviate the antiquated sand environmental pollution, kill two birds with one stone.
Technical scheme of the present invention is: separated after dealkalize by the alkaline pulp black liquor that to be dried into granular material again be that lignin dry powder is solute, the NaOH aqueous solution is that solvent is formulated.Its weight proportion is:
Lignin dry powder: 10-25%;
The NaOH aqueous solution (concentration 0.5-2%) 75-90%.
Primary raw material lignin of the present invention is owing to being that byproduct alkaline pulp black liquid separation from the paper industry environmental improvement comes out and dry to obtain, thereby reached comprehensive utilization, the purpose that turns waste into wealth.Be applied to the retained strength that can reduce casting water glass type (core) sand in the foundary industry as defeated and dispersed dose simultaneously, improve collapsibility, finally reach and improve cast cleaning efficient and casting quality, improve old sand reclamation rate and economic benefit, alleviate the pollution of antiquated sand environment.
Lignin dry powder mainly contains the plant cellulose of different molecular weight as defeated and dispersed dose solute, it is characterized by water insoluble, alcohol and acid solution, is only soluble in alkaline solution, therefore selects for use the NaOH aqueous solution as defeated and dispersed dose solvent.
Concrete preparing process is:
(1) heat: the lignin dry powder and the NaOH aqueous solution are contained in the same canister by said ratio, slowly heat up, and do not stop to stir;
(2) stop to heat: temperature reaches 90 ± 5 ℃ and stops to heat, slowly cooling in continuing stirring;
(3) cooling: cool to room temperature (below 30 ℃) gradually in not stopping to stir stops to stir.
This moment, lignin dry powder was dissolved in the NaOH solution fully, became lignin dispersing agent, contained in the plastic containers then, seal preserve standby.In concrete enforcement, lignin dry powder is preferential with 20%, and it is preferential that the NaOH aqueous solution adopts calcined soda for industry and general industry water to prepare (concentration 1% is preferential) content 80%.
Application technology below by the narration lignin dispersing agent further specifies the present invention.
Lignin dispersing agent of the present invention and waterglass are mixed with lignin waterglass, then with other component of water-glass sand by certain sand technology of joining, be mixed with lignin water-glass sand, as moulding (core) material of casting.
At first prepare lignin waterglass;
Proportioning (weight ratio): lignin dispersing agent: waterglass (modulus 2-2.5, proportion 1.5-1.55)=1: (8-12), in force 1: 9 preferential.
Preparation technology is: lignin dispersing agent and waterglass are contained into same container stirring 5 minutes by said ratio, made it even mixing, promptly become lignin waterglass.Its compound method is simple and easy to do.
The preparation of lignin water-glass sand:
(1) core sand of the easy light casting of preparation:
Roughing sand (50/100 contains mud amount≤1%) 89.8-95.1%;
Wooden waterglass: 4-7%
Alumina powder (≤100 orders, Al
2O
3〉=70%) 0.1-0.6%;
Brown iron oxide (≤140 order) 0.1-0.6%;
Sepiolite (≤140 orders, 28
#More than) 0.2-1%
Additional water 0.5-1%
(2) medium casting and complicated light casting core sand:
Roughing sand (50/100 contains mud amount≤1%) 88.1-94.4%;
Lignin waterglass 4.5-7.5%
Alumina powder (ditto) 0.1-0.6%
Brown iron oxide (ditto) 0.1-0.6%
Sepiolite (ditto) 0.2-1.0%
Dextrin 0.2-1.0%
Additional water 0.5-1%
(3) facing sand:
Roughing sand (ditto) 85-92.3%
Lignin waterglass 6-9%
Alumina powder (ditto) 0.1-1.0%
Brown iron oxide (ditto) 0.1-1.0%
Sepiolite (ditto) 1-3%
Additional water 0.5-1%
Sand mulling craft is: roughing sand and various powder were done mixed 2 minutes, added the water wet mixing 3 minutes, add lignin waterglass mixing 5 minutes, shake out.CO according to sand mold (core)
2Sclerosis standard: CO
2Concentration 〉=85%, CO
2Pressure 1.5 atmospheric pressure blow CO
2The 0.5-3 minute gas time (size, thickness on sand mold (core) are decided), dry standard according to sand mold (core): 180 ± 10 ℃, drying time is 0.5-2 hour (deciding on sand mold (core) size, thickness).
Application technology at above-mentioned lignin dispersing agent, because the fundamental component of lignin is a string, during casting, when sand mold (core) temperature rise is arrived 300-500 ℃, carbonization takes place in string gradually, in the waterglass adhesive film, stay the space of string, ashes and steam bubble, isolated the continuity of waterglass, it is diffusing that the waterglass film is collapsed under external impacts easily, significantly improved the collapsibility of water-glass sand, because the molecular weight of string is generally all very big, the space that stays is longer, waterglass film continuity is isolated more serious, show good collapsibility during sand removal.Alumina powder and brown iron oxide be as inorganic defeated and dispersed dose with, be used for the fusing point of waterglass film is improved, that is to say the retained strength of water-glass sand is improved, thereby further improve the collapsibility of water-glass sand, sepiolite belongs to clay class mineral, main effect is to replace bentonite to improve the pliability and the wet strength of core (type) sand, also has defeated and dispersed dose effect concurrently.
Satisfy the specification requirement (seeing table 1 for details) of medium and small castings production according to the composite technology performance of the lignin water-glass sand of above-mentioned preparation, and collapsibility significantly is better than light water glass sand (seeing table 2 for details).Lignin is used for cast steel production, when implementing anhydrous quick-fried sand removal technology, also can convenient sand removal, and old sand is the shot shape, helps reuse, and reclamation rate reaches 70%, reaches leading domestic level.
Annotate: defeated and dispersed merit is tested on Special Equipment, and defeated and dispersed merit shows that more for a short time retained strength is lower, and collapsibility is more excellent.
Embodiment
(1) at the test of zhuzhou,hunan car manafacturing factory (by simple light casting core sand prescription)
Roughing sand 92.1% lignin waterglass 6%
Alumina powder 0.2% brown iron oxide 0.2%
Sepiolite 0.5% additional water 1%
Test objective: check lignin water-glass sand is used for core shooting technology, produces the ability of small-sized foundry goods and implements the feasibility of anhydrous quick-fried sand removal technology.
Test casting: 150 ℃ of brake head (cast steel, 2G15, gross weight 6Kg) pouring temperatures.
Casting mold (core) technology: cored-up mould, pattern grouping, 9 on a type, swabbing not, sand mold and core all use lignin water-glass sand to penetrate system on the ZZ8612 core shooter, use CO in core box
2Sclerosis, firm time 1.5-2 minute.Go out box after the sclerosis immediately by the assembly unit of pattern grouping technology, cast on the same day.
Result of the test: not water quick-fried can convenient sand removal, casting dimension is accurate, outer surface is bright and clean, the bore area thick sinter layer of 1mm of having an appointment after heat treatment comes off fully, casting quality is qualified.Show that lignin water-glass sand can fine adaptation core shooting technology and anhydrous quick-fried sand removal technology.
(2) the test of Chenzhou, Hunan Diesel Engine Plant (pressing medium casting and complicated light casting core sand prescription)
Roughing sand 91.1% lignin waterglass 6.5%
Alumina powder 0.2% brown iron oxide 0.2%
Dextrin 0.5% sepiolite 0.5%
Additional water 1%
Test objective: the ability that check lignin water-glass sand replaces tung oil sand to produce small-sized intricate casting.
Test casting: 165F diesel engine cylinder sleeve
Processing performance: (seeing the following form)
| Project sand name | Wet strength (NPa) | Baked tensile strength (NPa) | 24h baked tensile strength (NPa) | Collapsibility |
| Lignin water-glass sand | 0.015-0.020 | 0.8-1.0 | 0.20-0.3 | Very |
| Tung oil sand | 0.02-0.03 | 0.7-1.0 | 0.28-0.4 | Excellent |
Annotate: (1) requires wet strength 〉=0.015MPa on producing
(2) collapsibility by excellent, good, in, can, poor, very poor six grades comment.
Pouring experiment result:
Pour into a mould 10 cylinder sleeve foundry goods, lignin water-glass sand gas forming amount is significantly less than tung oil sand, bursts and presses property near tung oil sand, and the cast cleaning facility is not found casting flaw after the processing.
(3) the same in the test (pressing medium casting and complicated light casting core sand prescription) of Deyang, Sichuan electrical machinery plant.
Test objective: check lignin water-glass sand is applied to produce the feasible type (being mainly used in coremaking) of medium-sized (0.5-5 ton) steel-casting.
Test casting (seeing the following form)
| Title | Material | Gross weight (kg) | Every molten steel gross weight (kg) | Average wall thickness (mm) | Pour into a mould gentle and kind (mm) | Main core size (mm) |
| The back cylinder cover thrust collar | ZG20SiNn ZG230-450 | 1300 960 | 2450 1850 | 60 70 | 1530 1530 | φ260×740 φ300×540 |
Processing performance: CO
2Sclerosis tension, compression strength and oven dry tension, compression strength all reaches and surpass the technical specification that factory stipulates for the light water glass sand.The collapsibility of 600 ℃, 850 ℃, 1100 ℃ three temperature spots is all good, basically can be defeated and dispersed voluntarily.
Pouring experiment result: be cooled to after the cast below 500 ℃ to unpack and carry out sand removal (water is not quick-fried), process is very smooth, and the old sand of clearing up is the shot shape, and having approximately about 70% can reuse.The foundry goods profile is clear, size is accurate, and the bore area part thick sintering thin layer of 1mm of having an appointment peels off after the annealing fully, and foundry goods is not found casting flaw through machining, proves that lignin water-glass sand is used to produce medium and small steel-casting function admirable.This factory is very satisfied to result of the test, and decision is adopted.
Therefore, the present invention not only becomes widely used material in the foundary industry with the byproduct of paper industry environmental improvement, reaching turns waste into wealth, and significantly reduced the retained strength of casting water glass type (core) sand, improve collapsibility, finally reached raising cast cleaning efficient and casting quality, improved old sand reclamation rate and economic benefit, alleviated the pollution of antiquated sand environment.
Calculate with the output of producing 1500 tons of steel-castings per year, compare, can save 1445 tons of the roughing sand of core sand (not comprising molding sand) every year with light water glass sand production technology, totally 11.5 ten thousand yuan, annual save surplus the antiquated sand discharge-ring premium 10,000 yuan, casting output is bigger, and benefit is more obviously.
Wooden plain waterglass is applicable to produces medium and small cast steel, cast iron and non-ferrous metal (copper, aluminium) foundry goods, can partly replace tung oil sand, resin sand to produce the following core of B level.
Claims (4)
1, a kind of lignin dispersing agent, feature of the present invention are to be separated after dealkalize by the alkaline pulp black liquor that to be dried into granular material again be that lignin dry powder is solute, and the NaOH aqueous solution is that solvent is formulated, and its weight proportion is:
Lignin dry powder: 10-25%;
The NaOH aqueous solution (concentration 0.5-2%) 75-90%.
2, lignin dispersing agent according to claim 1 is characterized in that its preparing process is:
(1) heat: the lignin dry powder and the NaOH aqueous solution are contained in the same canister by said ratio, slowly heat up, and do not stop to stir;
(2) stop to heat: temperature reaches 90 ± 5 ℃ and stops to heat, slowly cooling in continuing stirring;
(3) cooling: cool to room temperature (below 30 ℃) gradually in not stopping to stir stops to stir.
3, a kind of application by the lignin dispersing agent that claim 1 provided, feature of the present invention is to be lignin dispersing agent and waterglass to be contained in the same container by following proportioning stirred 5 minutes with the technology that lignin dispersing agent prepares wooden plain waterglass, make it evenly to mix.
Lignin dispersing agent: waterglass (modulus 2-2.5, proportion 1.5-1.55)=1: (8-12).
4, the application of lignin dispersing agent according to claim 3 is characterized in that with the technology of lignin waterglass preparation lignin water-glass sand it being that roughing sand and various powder were done mixed 2 minutes, added the water wet mixing 3 minutes, add lignin waterglass mixing 5 minutes, shake out, blow CO
20.5-3 minute gas time, 180 ± 10 ℃ of bake out temperatures, drying time are 0.5-2 hour, roughing sand, and the weight proportion of various powders and lignin waterglass is:
(1) core sand of the easy light casting of preparation:
Roughing sand (50/100 contains mud amount≤1%) 89.8-95.1%;
Wood glass: the 4-7% that draws water
Alumina powder (≤100 orders, Al
2O
3〉=70%) 0.1-0.6%;
Brown iron oxide (≤140 order) 0.1-0.6%;
Sepiolite (≤140 orders, 28
#More than) 0.2-1%
Additional water 0.5-1%
(2) preparation medium casting and complicated light casting core sand:
Roughing sand (50/100 contains mud amount≤1%) 88.1-94.4%;
Lignin waterglass 4.5-7.5%
Alumina powder (ditto) 0.1-0.6%
Brown iron oxide (ditto) 0.1-0.6%
Sepiolite (ditto) 0.2-1.0%
Dextrin 0.2-1.0%
Additional water 0.5-1%
(3) preparation facing sand:
Roughing sand (ditto) 85-92.3%
Lignin waterglass 6-9%
Alumina powder (ditto) 0.1-1.0%
Brown iron oxide (ditto) 0.1-1.0%
Sepiolite (ditto) 1-3%
Additional water 0.5-1%
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94110887 CN1037753C (en) | 1994-03-22 | 1994-03-22 | Lignin dispersing agent and its application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94110887 CN1037753C (en) | 1994-03-22 | 1994-03-22 | Lignin dispersing agent and its application |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1108978A true CN1108978A (en) | 1995-09-27 |
| CN1037753C CN1037753C (en) | 1998-03-18 |
Family
ID=5034804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94110887 Expired - Fee Related CN1037753C (en) | 1994-03-22 | 1994-03-22 | Lignin dispersing agent and its application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1037753C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100385580B1 (en) * | 2000-03-14 | 2003-05-27 | 조성웅 | Dispersant from Lignin |
| CN101259515B (en) * | 2007-03-05 | 2011-09-07 | 上海市机械制造工艺研究所有限公司 | CO2 hardened silicate-bonded sand additive agent and formative technology thereof |
| CN105215262A (en) * | 2015-10-08 | 2016-01-06 | 蚌埠冠宜型材科技有限公司 | A kind of environment-friendly type sandbinder |
| CN109047648A (en) * | 2018-09-26 | 2018-12-21 | 安徽江杰实业有限公司 | A kind of defeated and dispersed reinforcing agent of sodium silicate sand used for casting |
| CN110666096A (en) * | 2019-09-29 | 2020-01-10 | 含山县能华铸造有限公司 | Method for preparing casting molding sand with good collapsibility |
| CN110756732A (en) * | 2019-12-03 | 2020-02-07 | 安徽省含山县皖中减速机械有限公司 | Casting process for improving casting defects of speed reducer pin gear shell |
| 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 |
-
1994
- 1994-03-22 CN CN 94110887 patent/CN1037753C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100385580B1 (en) * | 2000-03-14 | 2003-05-27 | 조성웅 | Dispersant from Lignin |
| CN101259515B (en) * | 2007-03-05 | 2011-09-07 | 上海市机械制造工艺研究所有限公司 | CO2 hardened silicate-bonded sand additive agent and formative technology thereof |
| CN105215262A (en) * | 2015-10-08 | 2016-01-06 | 蚌埠冠宜型材科技有限公司 | A kind of environment-friendly type sandbinder |
| 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 |
| CN109047648A (en) * | 2018-09-26 | 2018-12-21 | 安徽江杰实业有限公司 | A kind of defeated and dispersed reinforcing agent of sodium silicate sand used for casting |
| CN110666096A (en) * | 2019-09-29 | 2020-01-10 | 含山县能华铸造有限公司 | Method for preparing casting molding sand with good collapsibility |
| CN110666096B (en) * | 2019-09-29 | 2020-10-30 | 含山县能华铸造有限公司 | Method for preparing casting molding sand with good collapsibility |
| CN110756732A (en) * | 2019-12-03 | 2020-02-07 | 安徽省含山县皖中减速机械有限公司 | Casting process for improving casting defects of speed reducer pin gear shell |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1037753C (en) | 1998-03-18 |
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